mcs/class/Mono.Posix/Mono.Unix/Syscall.cs

   1 //
   2 // Mono.Unix/Syscall.cs
   3 //
   4 // Authors:
   5 //   Miguel de Icaza (miguel@novell.com)
   6 //   Jonathan Pryor (jonpryor@vt.edu)
   7 //
   8 // (C) 2003 Novell, Inc.
   9 // (C) 2004-2005 Jonathan Pryor
  10 //
  11 // This file implements the low-level syscall interface to the POSIX
  12 // subsystem.
  13 //
  14 // This file tries to stay close to the low-level API as much as possible
  15 // using enumerations, structures and in a few cases, using existing .NET
  16 // data types.
  17 //
  18 // Implementation notes:
  19 //
  20 //    Since the values for the various constants on the API changes
  21 //    from system to system (even Linux on different architectures will
  22 //    have different values), we define our own set of values, and we
  23 //    use a set of C helper routines to map from the constants we define
  24 //    to the values of the native OS.
  25 //
  26 //    Bitfields are flagged with the [Map] attribute, and a helper program
  27 //    generates a set of routines that we can call to convert from our value
  28 //    definitions to the value definitions expected by the OS; see
  29 //    UnixConvert for the conversion routines.
  30 //
  31 //    Methods that require tuning are bound as `private sys_NAME' methods
  32 //    and then a `NAME' method is exposed.
  33 //
  34
  35 //
  36 // Permission is hereby granted, free of charge, to any person obtaining
  37 // a copy of this software and associated documentation files (the
  38 // "Software"), to deal in the Software without restriction, including
  39 // without limitation the rights to use, copy, modify, merge, publish,
  40 // distribute, sublicense, and/or sell copies of the Software, and to
  41 // permit persons to whom the Software is furnished to do so, subject to
  42 // the following conditions:
  43 //
  44 // The above copyright notice and this permission notice shall be
  45 // included in all copies or substantial portions of the Software.
  46 //
  47 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  48 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  49 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  50 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  51 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  52 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  53 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  54 //
  55
  56 using System;
  57 using System.Collections;
  58 using System.Runtime.InteropServices;
  59 using System.Text;
  60 using Mono.Unix;
  61
  62 [assembly:Mono.Unix.IncludeAttribute (
  63         new string [] {"sys/types.h", "sys/stat.h", ">sys/poll.h", ">sys/wait.h",
  64                 "unistd.h", "fcntl.h", "signal.h", ">poll.h", ">grp.h", "errno.h", ">syslog.h"},
  65         new string [] {"_GNU_SOURCE", "_XOPEN_SOURCE"})]
  66
  67 namespace Mono.Unix {
  68
  69         #region Enumerations
  70
  71         [Flags][Map]
  72         public enum SyslogOptions {
  73                 LOG_PID    = 0x01,  // log the pid with each message
  74                 LOG_CONS   = 0x02,  // log on the console if errors in sending
  75                 LOG_ODELAY = 0x04,  // delay open until first syslog (default)
  76                 LOG_NDELAY = 0x08,  // don't delay open
  77                 LOG_NOWAIT = 0x10,  // don't wait for console forks; DEPRECATED
  78                 LOG_PERROR = 0x20   // log to stderr as well
  79         }
  80
  81         [Flags][Map]
  82         public enum SyslogFacility {
  83                 LOG_KERN      = 0 << 3,
  84                 LOG_USRE      = 1 << 3,
  85                 LOG_MAIL      = 2 << 3,
  86                 LOG_DAEMON    = 3 << 3,
  87                 LOG_AUTH      = 4 << 3,
  88                 LOG_SYSLOG    = 5 << 3,
  89                 LOG_LPR       = 6 << 3,
  90                 LOG_NEWS      = 7 << 3,
  91                 LOG_UUCP      = 8 << 3,
  92                 LOG_CRON      = 8 << 3,
  93                 LOG_AUTHPRIV  = 10 << 3,
  94                 LOG_FTP       = 11 << 3,
  95                 LOG_LOCAL0    = 16 << 3,
  96                 LOG_LOCAL1    = 17 << 3,
  97                 LOG_LOCAL2    = 18 << 3,
  98                 LOG_LOCAL3    = 19 << 3,
  99                 LOG_LOCAL4    = 20 << 3,
 100                 LOG_LOCAL5    = 21 << 3,
 101                 LOG_LOCAL6    = 22 << 3,
 102                 LOG_LOCAL7    = 23 << 3,
 103         }
 104
 105         [Flags][Map]
 106         public enum SyslogLevel {
 107                 LOG_EMERG   = 0,  // system is unusable
 108                 LOG_ALERT   = 1,  // action must be taken immediately
 109                 LOG_CRIT    = 2,  // critical conditions
 110                 LOG_ERR     = 3,  // warning conditions
 111                 LOG_WARNING = 4,  // warning conditions
 112                 LOG_NOTICE  = 5,  // normal but significant condition
 113                 LOG_INFO    = 6,  // informational
 114                 LOG_DEBUG   = 7   // debug-level messages
 115         }
 116
 117         [Map][Flags]
 118         public enum OpenFlags : int {
 119                 //
 120                 // One of these
 121                 //
 122                 O_RDONLY    = 0x00000000,
 123                 O_WRONLY    = 0x00000001,
 124                 O_RDWR      = 0x00000002,
 125
 126                 //
 127                 // Or-ed with zero or more of these
 128                 //
 129                 O_CREAT     = 0x00000040,
 130                 O_EXCL      = 0x00000080,
 131                 O_NOCTTY    = 0x00000100,
 132                 O_TRUNC     = 0x00000200,
 133                 O_APPEND    = 0x00000400,
 134                 O_NONBLOCK  = 0x00000800,
 135                 O_SYNC      = 0x00001000,
 136
 137                 //
 138                 // These are non-Posix.  Using them will result in errors/exceptions on
 139                 // non-supported platforms.
 140                 //
 141                 // (For example, "C-wrapped" system calls -- calls with implementation in
 142                 // MonoPosixHelper -- will return -1 with errno=EINVAL.  C#-wrapped system
 143                 // calls will generate an exception in UnixConvert, as the value can't be
 144                 // converted on the target platform.)
 145                 //
 146
 147                 O_NOFOLLOW  = 0x00020000,
 148                 O_DIRECTORY = 0x00010000,
 149                 O_DIRECT    = 0x00004000,
 150                 O_ASYNC     = 0x00002000,
 151                 O_LARGEFILE = 0x00008000
 152         }
 153
 154         // mode_t
 155         [Flags][Map]
 156         public enum FilePermissions : uint {
 157                 S_ISUID     = 0x0800, // Set user ID on execution
 158                 S_ISGID     = 0x0400, // Set gorup ID on execution
 159                 S_ISVTX     = 0x0200, // Save swapped text after use (sticky).
 160                 S_IRUSR     = 0x0100, // Read by owner
 161                 S_IWUSR     = 0x0080, // Write by owner
 162                 S_IXUSR     = 0x0040, // Execute by owner
 163                 S_IRGRP     = 0x0020, // Read by group
 164                 S_IWGRP     = 0x0010, // Write by group
 165                 S_IXGRP     = 0x0008, // Execute by group
 166                 S_IROTH     = 0x0004, // Read by other
 167                 S_IWOTH     = 0x0002, // Write by other
 168                 S_IXOTH     = 0x0001, // Execute by other
 169
 170                 S_IRWXG     = (S_IRGRP | S_IWGRP | S_IXGRP),
 171                 S_IRWXU     = (S_IRUSR | S_IWUSR | S_IXUSR),
 172                 S_IRWXO     = (S_IROTH | S_IWOTH | S_IXOTH),
 173                 ACCESSPERMS = (S_IRWXU | S_IRWXG | S_IRWXO), // 0777
 174                 ALLPERMS    = (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO), // 07777
 175                 DEFFILEMODE = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH), // 0666
 176
 177                 // Device types
 178                 // Why these are held in "mode_t" is beyond me...
 179                 S_IFMT      = 0xF000, // Bits which determine file type
 180                 S_IFDIR     = 0x4000, // Directory
 181                 S_IFCHR     = 0x2000, // Character device
 182                 S_IFBLK     = 0x6000, // Block device
 183                 S_IFREG     = 0x8000, // Regular file
 184                 S_IFIFO     = 0x1000, // FIFO
 185                 S_IFLNK     = 0xA000, // Symbolic link
 186                 S_IFSOCK    = 0xC000, // Socket
 187         }
 188
 189         [Map]
 190         public enum FcntlCommand : int {
 191                 // Form /usr/include/bits/fcntl.h
 192                 F_DUPFD    =    0, // Duplicate file descriptor.
 193                 F_GETFD    =    1, // Get file descriptor flags.
 194                 F_SETFD    =    2, // Set file descriptor flags.
 195                 F_GETFL    =    3, // Get file status flags.
 196                 F_SETFL    =    4, // Set file status flags.
 197                 F_GETLK    =   12, // Get record locking info. [64]
 198                 F_SETLK    =   13, // Set record locking info (non-blocking). [64]
 199                 F_SETLKW   =   14, // Set record locking info (blocking). [64]
 200                 F_SETOWN   =    8, // Set owner of socket (receiver of SIGIO).
 201                 F_GETOWN   =    9, // Get owner of socket (receiver of SIGIO).
 202                 F_SETSIG   =   10, // Set number of signal to be sent.
 203                 F_GETSIG   =   11, // Get number of signal to be sent.
 204                 F_SETLEASE = 1024, // Set a lease.
 205                 F_GETLEASE = 1025, // Enquire what lease is active.
 206                 F_NOTIFY   = 1026, // Required notifications on a directory
 207         }
 208
 209         [Map]
 210         public enum LockType : short {
 211                 F_RDLCK = 0, // Read lock.
 212                 F_WRLCK = 1, // Write lock.
 213                 F_UNLCK = 2, // Remove lock.
 214         }
 215
 216         [Map]
 217         public enum SeekFlags : short {
 218                 // values liberally copied from /usr/include/unistd.h
 219                 SEEK_SET = 0, // Seek from beginning of file.
 220                 SEEK_CUR = 1, // Seek from current position.
 221                 SEEK_END = 2, // Seek from end of file.
 222
 223                 L_SET    = SEEK_SET, // BSD alias for SEEK_SET
 224                 L_INCR   = SEEK_CUR, // BSD alias for SEEK_CUR
 225                 L_XTND   = SEEK_END, // BSD alias for SEEK_END
 226         }
 227
 228         [Map, Flags]
 229         public enum DirectoryNotifyFlags : int {
 230                 // from /usr/include/bits/fcntl.h
 231                 DN_ACCESS    = 0x00000001, // File accessed.
 232                 DN_MODIFY    = 0x00000002, // File modified.
 233                 DN_CREATE    = 0x00000004, // File created.
 234                 DN_DELETE    = 0x00000008, // File removed.
 235                 DN_RENAME    = 0x00000010, // File renamed.
 236                 DN_ATTRIB    = 0x00000020, // File changed attributes.
 237                 DN_MULTISHOT = unchecked ((int)0x80000000), // Don't remove notifier
 238         }
 239
 240         [Map]
 241         public enum PosixFadviseAdvice : int {
 242                 POSIX_FADV_NORMAL     = 0,  // No further special treatment.
 243                 POSIX_FADV_RANDOM     = 1,  // Expect random page references.
 244                 POSIX_FADV_SEQUENTIAL = 2,  // Expect sequential page references.
 245                 POSIX_FADV_WILLNEED   = 3,  // Will need these pages.
 246                 POSIX_FADV_DONTNEED   = 4,  // Don't need these pages.
 247                 POSIX_FADV_NOREUSE    = 5,  // Data will be accessed once.
 248         }
 249
 250         [Map]
 251         public enum PosixMadviseAdvice : int {
 252                 POSIX_MADV_NORMAL     = 0,  // No further special treatment.
 253                 POSIX_MADV_RANDOM     = 1,  // Expect random page references.
 254                 POSIX_MADV_SEQUENTIAL = 2,  // Expect sequential page references.
 255                 POSIX_MADV_WILLNEED   = 3,  // Will need these pages.
 256                 POSIX_MADV_DONTNEED   = 4,  // Don't need these pages.
 257         }
 258
 259         [Map]
 260         public enum Signum : int {
 261                 SIGHUP    =  1, // Hangup (POSIX).
 262                 SIGINT    =  2, // Interrupt (ANSI).
 263                 SIGQUIT   =  3, // Quit (POSIX).
 264                 SIGILL    =  4, // Illegal instruction (ANSI).
 265                 SIGTRAP   =  5, // Trace trap (POSIX).
 266                 SIGABRT   =  6, // Abort (ANSI).
 267                 SIGIOT    =  6, // IOT trap (4.2 BSD).
 268                 SIGBUS    =  7, // BUS error (4.2 BSD).
 269                 SIGFPE    =  8, // Floating-point exception (ANSI).
 270                 SIGKILL   =  9, // Kill, unblockable (POSIX).
 271                 SIGUSR1   = 10, // User-defined signal 1 (POSIX).
 272                 SIGSEGV   = 11, // Segmentation violation (ANSI).
 273                 SIGUSR2   = 12, // User-defined signal 2 (POSIX).
 274                 SIGPIPE   = 13, // Broken pipe (POSIX).
 275                 SIGALRM   = 14, // Alarm clock (POSIX).
 276                 SIGTERM   = 15, // Termination (ANSI).
 277                 SIGSTKFLT = 16, // Stack fault.
 278                 SIGCLD    = SIGCHLD, // Same as SIGCHLD (System V).
 279                 SIGCHLD   = 17, // Child status has changed (POSIX).
 280                 SIGCONT   = 18, // Continue (POSIX).
 281                 SIGSTOP   = 19, // Stop, unblockable (POSIX).
 282                 SIGTSTP   = 20, // Keyboard stop (POSIX).
 283                 SIGTTIN   = 21, // Background read from tty (POSIX).
 284                 SIGTTOU   = 22, // Background write to tty (POSIX).
 285                 SIGURG    = 23, // Urgent condition on socket (4.2 BSD).
 286                 SIGXCPU   = 24, // CPU limit exceeded (4.2 BSD).
 287                 SIGXFSZ   = 25, // File size limit exceeded (4.2 BSD).
 288                 SIGVTALRM = 26, // Virtual alarm clock (4.2 BSD).
 289                 SIGPROF   = 27, // Profiling alarm clock (4.2 BSD).
 290                 SIGWINCH  = 28, // Window size change (4.3 BSD, Sun).
 291                 SIGPOLL   = SIGIO, // Pollable event occurred (System V).
 292                 SIGIO     = 29, // I/O now possible (4.2 BSD).
 293                 SIGPWR    = 30, // Power failure restart (System V).
 294                 SIGSYS    = 31, // Bad system call.
 295                 SIGUNUSED = 31
 296         }
 297
 298         [Flags][Map]
 299         public enum WaitOptions : int {
 300                 WNOHANG   = 1,  // Don't block waiting
 301                 WUNTRACED = 2,  // Report status of stopped children
 302         }
 303
 304   [Flags][Map]
 305         public enum AccessMode : int {
 306                 R_OK = 1,
 307                 W_OK = 2,
 308                 X_OK = 4,
 309                 F_OK = 8,
 310         }
 311
 312         [Map]
 313         public enum PathConf : int {
 314                 _PC_LINK_MAX,
 315                 _PC_MAX_CANON,
 316                 _PC_MAX_INPUT,
 317                 _PC_NAME_MAX,
 318                 _PC_PATH_MAX,
 319                 _PC_PIPE_BUF,
 320                 _PC_CHOWN_RESTRICTED,
 321                 _PC_NO_TRUNC,
 322                 _PC_VDISABLE,
 323                 _PC_SYNC_IO,
 324                 _PC_ASYNC_IO,
 325                 _PC_PRIO_IO,
 326                 _PC_SOCK_MAXBUF,
 327                 _PC_FILESIZEBITS,
 328                 _PC_REC_INCR_XFER_SIZE,
 329                 _PC_REC_MAX_XFER_SIZE,
 330                 _PC_REC_MIN_XFER_SIZE,
 331                 _PC_REC_XFER_ALIGN,
 332                 _PC_ALLOC_SIZE_MIN,
 333                 _PC_SYMLINK_MAX,
 334                 _PC_2_SYMLINKS
 335         }
 336
 337         [Map]
 338         public enum SysConf : int {
 339                 _SC_ARG_MAX,
 340                 _SC_CHILD_MAX,
 341                 _SC_CLK_TCK,
 342                 _SC_NGROUPS_MAX,
 343                 _SC_OPEN_MAX,
 344                 _SC_STREAM_MAX,
 345                 _SC_TZNAME_MAX,
 346                 _SC_JOB_CONTROL,
 347                 _SC_SAVED_IDS,
 348                 _SC_REALTIME_SIGNALS,
 349                 _SC_PRIORITY_SCHEDULING,
 350                 _SC_TIMERS,
 351                 _SC_ASYNCHRONOUS_IO,
 352                 _SC_PRIORITIZED_IO,
 353                 _SC_SYNCHRONIZED_IO,
 354                 _SC_FSYNC,
 355                 _SC_MAPPED_FILES,
 356                 _SC_MEMLOCK,
 357                 _SC_MEMLOCK_RANGE,
 358                 _SC_MEMORY_PROTECTION,
 359                 _SC_MESSAGE_PASSING,
 360                 _SC_SEMAPHORES,
 361                 _SC_SHARED_MEMORY_OBJECTS,
 362                 _SC_AIO_LISTIO_MAX,
 363                 _SC_AIO_MAX,
 364                 _SC_AIO_PRIO_DELTA_MAX,
 365                 _SC_DELAYTIMER_MAX,
 366                 _SC_MQ_OPEN_MAX,
 367                 _SC_MQ_PRIO_MAX,
 368                 _SC_VERSION,
 369                 _SC_PAGESIZE,
 370                 _SC_RTSIG_MAX,
 371                 _SC_SEM_NSEMS_MAX,
 372                 _SC_SEM_VALUE_MAX,
 373                 _SC_SIGQUEUE_MAX,
 374                 _SC_TIMER_MAX,
 375                 /* Values for the argument to `sysconf'
 376                          corresponding to _POSIX2_* symbols.  */
 377                 _SC_BC_BASE_MAX,
 378                 _SC_BC_DIM_MAX,
 379                 _SC_BC_SCALE_MAX,
 380                 _SC_BC_STRING_MAX,
 381                 _SC_COLL_WEIGHTS_MAX,
 382                 _SC_EQUIV_CLASS_MAX,
 383                 _SC_EXPR_NEST_MAX,
 384                 _SC_LINE_MAX,
 385                 _SC_RE_DUP_MAX,
 386                 _SC_CHARCLASS_NAME_MAX,
 387                 _SC_2_VERSION,
 388                 _SC_2_C_BIND,
 389                 _SC_2_C_DEV,
 390                 _SC_2_FORT_DEV,
 391                 _SC_2_FORT_RUN,
 392                 _SC_2_SW_DEV,
 393                 _SC_2_LOCALEDEF,
 394                 _SC_PII,
 395                 _SC_PII_XTI,
 396                 _SC_PII_SOCKET,
 397                 _SC_PII_INTERNET,
 398                 _SC_PII_OSI,
 399                 _SC_POLL,
 400                 _SC_SELECT,
 401                 _SC_UIO_MAXIOV,
 402                 _SC_IOV_MAX = _SC_UIO_MAXIOV,
 403                 _SC_PII_INTERNET_STREAM,
 404                 _SC_PII_INTERNET_DGRAM,
 405                 _SC_PII_OSI_COTS,
 406                 _SC_PII_OSI_CLTS,
 407                 _SC_PII_OSI_M,
 408                 _SC_T_IOV_MAX,
 409                 /* Values according to POSIX 1003.1c (POSIX threads).  */
 410                 _SC_THREADS,
 411                 _SC_THREAD_SAFE_FUNCTIONS,
 412                 _SC_GETGR_R_SIZE_MAX,
 413                 _SC_GETPW_R_SIZE_MAX,
 414                 _SC_LOGIN_NAME_MAX,
 415                 _SC_TTY_NAME_MAX,
 416                 _SC_THREAD_DESTRUCTOR_ITERATIONS,
 417                 _SC_THREAD_KEYS_MAX,
 418                 _SC_THREAD_STACK_MIN,
 419                 _SC_THREAD_THREADS_MAX,
 420                 _SC_THREAD_ATTR_STACKADDR,
 421                 _SC_THREAD_ATTR_STACKSIZE,
 422                 _SC_THREAD_PRIORITY_SCHEDULING,
 423                 _SC_THREAD_PRIO_INHERIT,
 424                 _SC_THREAD_PRIO_PROTECT,
 425                 _SC_THREAD_PROCESS_SHARED,
 426                 _SC_NPROCESSORS_CONF,
 427                 _SC_NPROCESSORS_ONLN,
 428                 _SC_PHYS_PAGES,
 429                 _SC_AVPHYS_PAGES,
 430                 _SC_ATEXIT_MAX,
 431                 _SC_PASS_MAX,
 432                 _SC_XOPEN_VERSION,
 433                 _SC_XOPEN_XCU_VERSION,
 434                 _SC_XOPEN_UNIX,
 435                 _SC_XOPEN_CRYPT,
 436                 _SC_XOPEN_ENH_I18N,
 437                 _SC_XOPEN_SHM,
 438                 _SC_2_CHAR_TERM,
 439                 _SC_2_C_VERSION,
 440                 _SC_2_UPE,
 441                 _SC_XOPEN_XPG2,
 442                 _SC_XOPEN_XPG3,
 443                 _SC_XOPEN_XPG4,
 444                 _SC_CHAR_BIT,
 445                 _SC_CHAR_MAX,
 446                 _SC_CHAR_MIN,
 447                 _SC_INT_MAX,
 448                 _SC_INT_MIN,
 449                 _SC_LONG_BIT,
 450                 _SC_WORD_BIT,
 451                 _SC_MB_LEN_MAX,
 452                 _SC_NZERO,
 453                 _SC_SSIZE_MAX,
 454                 _SC_SCHAR_MAX,
 455                 _SC_SCHAR_MIN,
 456                 _SC_SHRT_MAX,
 457                 _SC_SHRT_MIN,
 458                 _SC_UCHAR_MAX,
 459                 _SC_UINT_MAX,
 460                 _SC_ULONG_MAX,
 461                 _SC_USHRT_MAX,
 462                 _SC_NL_ARGMAX,
 463                 _SC_NL_LANGMAX,
 464                 _SC_NL_MSGMAX,
 465                 _SC_NL_NMAX,
 466                 _SC_NL_SETMAX,
 467                 _SC_NL_TEXTMAX,
 468                 _SC_XBS5_ILP32_OFF32,
 469                 _SC_XBS5_ILP32_OFFBIG,
 470                 _SC_XBS5_LP64_OFF64,
 471                 _SC_XBS5_LPBIG_OFFBIG,
 472                 _SC_XOPEN_LEGACY,
 473                 _SC_XOPEN_REALTIME,
 474                 _SC_XOPEN_REALTIME_THREADS,
 475                 _SC_ADVISORY_INFO,
 476                 _SC_BARRIERS,
 477                 _SC_BASE,
 478                 _SC_C_LANG_SUPPORT,
 479                 _SC_C_LANG_SUPPORT_R,
 480                 _SC_CLOCK_SELECTION,
 481                 _SC_CPUTIME,
 482                 _SC_THREAD_CPUTIME,
 483                 _SC_DEVICE_IO,
 484                 _SC_DEVICE_SPECIFIC,
 485                 _SC_DEVICE_SPECIFIC_R,
 486                 _SC_FD_MGMT,
 487                 _SC_FIFO,
 488                 _SC_PIPE,
 489                 _SC_FILE_ATTRIBUTES,
 490                 _SC_FILE_LOCKING,
 491                 _SC_FILE_SYSTEM,
 492                 _SC_MONOTONIC_CLOCK,
 493                 _SC_MULTI_PROCESS,
 494                 _SC_SINGLE_PROCESS,
 495                 _SC_NETWORKING,
 496                 _SC_READER_WRITER_LOCKS,
 497                 _SC_SPIN_LOCKS,
 498                 _SC_REGEXP,
 499                 _SC_REGEX_VERSION,
 500                 _SC_SHELL,
 501                 _SC_SIGNALS,
 502                 _SC_SPAWN,
 503                 _SC_SPORADIC_SERVER,
 504                 _SC_THREAD_SPORADIC_SERVER,
 505                 _SC_SYSTEM_DATABASE,
 506                 _SC_SYSTEM_DATABASE_R,
 507                 _SC_TIMEOUTS,
 508                 _SC_TYPED_MEMORY_OBJECTS,
 509                 _SC_USER_GROUPS,
 510                 _SC_USER_GROUPS_R,
 511                 _SC_2_PBS,
 512                 _SC_2_PBS_ACCOUNTING,
 513                 _SC_2_PBS_LOCATE,
 514                 _SC_2_PBS_MESSAGE,
 515                 _SC_2_PBS_TRACK,
 516                 _SC_SYMLOOP_MAX,
 517                 _SC_STREAMS,
 518                 _SC_2_PBS_CHECKPOINT,
 519                 _SC_V6_ILP32_OFF32,
 520                 _SC_V6_ILP32_OFFBIG,
 521                 _SC_V6_LP64_OFF64,
 522                 _SC_V6_LPBIG_OFFBIG,
 523                 _SC_HOST_NAME_MAX,
 524                 _SC_TRACE,
 525                 _SC_TRACE_EVENT_FILTER,
 526                 _SC_TRACE_INHERIT,
 527                 _SC_TRACE_LOG,
 528                 _SC_LEVEL1_ICACHE_SIZE,
 529                 _SC_LEVEL1_ICACHE_ASSOC,
 530                 _SC_LEVEL1_ICACHE_LINESIZE,
 531                 _SC_LEVEL1_DCACHE_SIZE,
 532                 _SC_LEVEL1_DCACHE_ASSOC,
 533                 _SC_LEVEL1_DCACHE_LINESIZE,
 534                 _SC_LEVEL2_CACHE_SIZE,
 535                 _SC_LEVEL2_CACHE_ASSOC,
 536                 _SC_LEVEL2_CACHE_LINESIZE,
 537                 _SC_LEVEL3_CACHE_SIZE,
 538                 _SC_LEVEL3_CACHE_ASSOC,
 539                 _SC_LEVEL3_CACHE_LINESIZE,
 540                 _SC_LEVEL4_CACHE_SIZE,
 541                 _SC_LEVEL4_CACHE_ASSOC,
 542                 _SC_LEVEL4_CACHE_LINESIZE
 543         }
 544
 545         [Map]
 546         public enum ConfStr : int {
 547                 _CS_PATH,                       /* The default search path.  */
 548                 _CS_V6_WIDTH_RESTRICTED_ENVS,
 549                 _CS_GNU_LIBC_VERSION,
 550                 _CS_GNU_LIBPTHREAD_VERSION,
 551                 _CS_LFS_CFLAGS = 1000,
 552                 _CS_LFS_LDFLAGS,
 553                 _CS_LFS_LIBS,
 554                 _CS_LFS_LINTFLAGS,
 555                 _CS_LFS64_CFLAGS,
 556                 _CS_LFS64_LDFLAGS,
 557                 _CS_LFS64_LIBS,
 558                 _CS_LFS64_LINTFLAGS,
 559                 _CS_XBS5_ILP32_OFF32_CFLAGS = 1100,
 560                 _CS_XBS5_ILP32_OFF32_LDFLAGS,
 561                 _CS_XBS5_ILP32_OFF32_LIBS,
 562                 _CS_XBS5_ILP32_OFF32_LINTFLAGS,
 563                 _CS_XBS5_ILP32_OFFBIG_CFLAGS,
 564                 _CS_XBS5_ILP32_OFFBIG_LDFLAGS,
 565                 _CS_XBS5_ILP32_OFFBIG_LIBS,
 566                 _CS_XBS5_ILP32_OFFBIG_LINTFLAGS,
 567                 _CS_XBS5_LP64_OFF64_CFLAGS,
 568                 _CS_XBS5_LP64_OFF64_LDFLAGS,
 569                 _CS_XBS5_LP64_OFF64_LIBS,
 570                 _CS_XBS5_LP64_OFF64_LINTFLAGS,
 571                 _CS_XBS5_LPBIG_OFFBIG_CFLAGS,
 572                 _CS_XBS5_LPBIG_OFFBIG_LDFLAGS,
 573                 _CS_XBS5_LPBIG_OFFBIG_LIBS,
 574                 _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS,
 575                 _CS_POSIX_V6_ILP32_OFF32_CFLAGS,
 576                 _CS_POSIX_V6_ILP32_OFF32_LDFLAGS,
 577                 _CS_POSIX_V6_ILP32_OFF32_LIBS,
 578                 _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS,
 579                 _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS,
 580                 _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS,
 581                 _CS_POSIX_V6_ILP32_OFFBIG_LIBS,
 582                 _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS,
 583                 _CS_POSIX_V6_LP64_OFF64_CFLAGS,
 584                 _CS_POSIX_V6_LP64_OFF64_LDFLAGS,
 585                 _CS_POSIX_V6_LP64_OFF64_LIBS,
 586                 _CS_POSIX_V6_LP64_OFF64_LINTFLAGS,
 587                 _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS,
 588                 _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS,
 589                 _CS_POSIX_V6_LPBIG_OFFBIG_LIBS,
 590                 _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS
 591         }
 592
 593         [Map]
 594         public enum LockFlags : int {
 595                 F_ULOCK = 0, // Unlock a previously locked region.
 596                 F_LOCK  = 1, // Lock a region for exclusive use.
 597                 F_TLOCK = 2, // Test and lock a region for exclusive use.
 598                 F_TEST  = 3, // Test a region for other process locks.
 599         }
 600
 601         [Map][Flags]
 602         public enum PollEvents : short {
 603                 POLLIN      = 0x0001, // There is data to read
 604                 POLLPRI     = 0x0002, // There is urgent data to read
 605                 POLLOUT     = 0x0004, // Writing now will not block
 606                 POLLERR     = 0x0008, // Error condition
 607                 POLLHUP     = 0x0010, // Hung up
 608                 POLLNVAL    = 0x0020, // Invalid request; fd not open
 609                 // XPG4.2 definitions (via _XOPEN_SOURCE)
 610                 POLLRDNORM  = 0x0040, // Normal data bay be read
 611                 POLLRDBAND  = 0x0080, // Priority data may be read
 612                 POLLWRNORM  = 0x0100, // Writing now will not block
 613                 POLLWRBAND  = 0x0200, // Priority data may be written
 614         }
 615
 616         [Map][Flags]
 617         public enum XattrFlags : int {
 618                 XATTR_AUTO = 0,
 619                 XATTR_CREATE = 1,
 620                 XATTR_REPLACE = 2,
 621         }
 622
 623         #endregion
 624
 625         #region Structures
 626
 627         public struct Flock {
 628                 public LockType         l_type;    // Type of lock: F_RDLCK, F_WRLCK, F_UNLCK
 629                 public SeekFlags        l_whence;  // How to interpret l_start
 630                 public /* off_t */ long l_start;   // Starting offset for lock
 631                 public /* off_t */ long l_len;     // Number of bytes to lock
 632                 public /* pid_t */ int  l_pid;     // PID of process blocking our lock (F_GETLK only)
 633         }
 634
 635         [StructLayout(LayoutKind.Sequential)]
 636         public struct Pollfd {
 637                 public int fd;
 638                 public PollEvents events;
 639                 public PollEvents revents;
 640         }
 641
 642         public struct Stat {
 643                 public  /* dev_t */     ulong   st_dev;     // device
 644                 public  /* ino_t */     ulong   st_ino;     // inode
 645                 public  FilePermissions         st_mode;    // protection
 646                 private uint                    _padding_;  // padding for structure alignment
 647                 public  /* nlink_t */   ulong   st_nlink;   // number of hard links
 648                 public  /* uid_t */     uint    st_uid;     // user ID of owner
 649                 public  /* gid_t */     uint    st_gid;     // group ID of owner
 650                 public  /* dev_t */     ulong   st_rdev;    // device type (if inode device)
 651                 public  /* off_t */     long    st_size;    // total size, in bytes
 652                 public  /* blksize_t */ long    st_blksize; // blocksize for filesystem I/O
 653                 public  /* blkcnt_t */  long    st_blocks;  // number of blocks allocated
 654                 public  /* time_t */    long    st_atime;   // time of last access
 655                 public  /* time_t */    long    st_mtime;   // time of last modification
 656                 public  /* time_t */    long    st_ctime;   // time of last status change
 657         }
 658
 659         public struct Statvfs {
 660                 public                  ulong f_bsize;    // file system block size
 661                 public                  ulong f_frsize;   // fragment size
 662                 public /* fsblkcnt_t */ ulong f_blocks;   // size of fs in f_frsize units
 663                 public /* fsblkcnt_t */ ulong f_bfree;    // # free blocks
 664                 public /* fsblkcnt_t */ ulong f_bavail;   // # free blocks for non-root
 665                 public /* fsfilcnt_t */ ulong f_files;    // # inodes
 666                 public /* fsfilcnt_t */ ulong f_ffree;    // # free inodes
 667                 public /* fsfilcnt_t */ ulong f_favail;   // # free inodes for non-root
 668                 public                  ulong f_fsid;     // file system id
 669                 public                  ulong f_flag;     // mount flags
 670                 public                  ulong f_namemax;  // maximum filename length
 671         }
 672
 673         public struct Timeval {
 674                 public  /* time_t */      long    tv_sec;   // seconds
 675                 public  /* suseconds_t */ long    tv_usec;  // microseconds
 676         }
 677
 678         public struct Timezone {
 679                 public  int tz_minuteswest; // minutes W of Greenwich
 680                 private int tz_dsttime;     // type of dst correction (OBSOLETE)
 681         }
 682
 683         public struct Utimbuf {
 684                 public  /* time_t */      long    actime;   // access time
 685                 public  /* time_t */      long    modtime;  // modification time
 686         }
 687
 688         #endregion
 689
 690         #region Classes
 691
 692         public sealed class Dirent
 693         {
 694                 public /* ino_t */ ulong  d_ino;
 695                 public /* off_t */ long   d_off;
 696                 public ushort             d_reclen;
 697                 public byte               d_type;
 698                 public string             d_name;
 699
 700                 public override int GetHashCode ()
 701                 {
 702                         return d_ino.GetHashCode () ^ d_off.GetHashCode () ^
 703                                 d_reclen.GetHashCode () ^ d_type.GetHashCode () ^
 704                                 d_name.GetHashCode ();
 705                 }
 706
 707                 public override bool Equals (object obj)
 708                 {
 709                         if (obj == null || GetType() != obj.GetType())
 710                                 return false;
 711                         Dirent d = (Dirent) obj;
 712                         return d.d_ino == d_ino && d.d_off == d_off &&
 713                                 d.d_reclen == d_reclen && d.d_type == d_type &&
 714                                 d.d_name == d_name;
 715                 }
 716
 717                 public override string ToString ()
 718                 {
 719                         return d_name;
 720                 }
 721
 722                 public static bool operator== (Dirent lhs, Dirent rhs)
 723                 {
 724                         return Object.Equals (lhs, rhs);
 725                 }
 726
 727                 public static bool operator!= (Dirent lhs, Dirent rhs)
 728                 {
 729                         return !Object.Equals (lhs, rhs);
 730                 }
 731         }
 732
 733         public sealed class Fstab
 734         {
 735                 public string fs_spec;
 736                 public string fs_file;
 737                 public string fs_vfstype;
 738                 public string fs_mntops;
 739                 public string fs_type;
 740                 public int    fs_freq;
 741                 public int    fs_passno;
 742
 743                 public override int GetHashCode ()
 744                 {
 745                         return fs_spec.GetHashCode () ^ fs_file.GetHashCode () ^
 746                                 fs_vfstype.GetHashCode () ^ fs_mntops.GetHashCode () ^
 747                                 fs_type.GetHashCode () ^ fs_freq ^ fs_passno;
 748                 }
 749
 750                 public override bool Equals (object obj)
 751                 {
 752                         if (obj == null || GetType() != obj.GetType())
 753                                 return false;
 754                         Fstab  f = (Fstab) obj;
 755                         return f.fs_spec == fs_spec && f.fs_file == fs_file &&
 756                                 f.fs_vfstype == fs_vfstype && f.fs_mntops == fs_mntops &&
 757                                 f.fs_type == fs_type && f.fs_freq == fs_freq &&
 758                                 f.fs_passno == fs_passno;
 759                 }
 760
 761                 public override string ToString ()
 762                 {
 763                         return fs_spec;
 764                 }
 765
 766                 public static bool operator== (Fstab lhs, Fstab rhs)
 767                 {
 768                         return Object.Equals (lhs, rhs);
 769                 }
 770
 771                 public static bool operator!= (Fstab lhs, Fstab rhs)
 772                 {
 773                         return !Object.Equals (lhs, rhs);
 774                 }
 775         }
 776
 777         public sealed class Group
 778         {
 779                 public string           gr_name;
 780                 public string           gr_passwd;
 781                 public /* gid_t */ uint gr_gid;
 782                 public string[]         gr_mem;
 783
 784                 public override int GetHashCode ()
 785                 {
 786                         int memhc = 0;
 787                         for (int i = 0; i < gr_mem.Length; ++i)
 788                                 memhc ^= gr_mem[i].GetHashCode ();
 789
 790                         return gr_name.GetHashCode () ^ gr_passwd.GetHashCode () ^
 791                                 gr_gid.GetHashCode () ^ memhc;
 792                 }
 793
 794                 public override bool Equals (object obj)
 795                 {
 796                         if (obj == null || GetType() != obj.GetType())
 797                                 return false;
 798                         Group g = (Group) obj;
 799                         if (g.gr_gid != gr_gid)
 800                                 return false;
 801                         if (g.gr_gid == gr_gid && g.gr_name == gr_name &&
 802                                 g.gr_passwd == gr_passwd) {
 803                                 if (g.gr_mem == gr_mem)
 804                                         return true;
 805                                 if (g.gr_mem == null || gr_mem == null)
 806                                         return false;
 807                                 if (g.gr_mem.Length != gr_mem.Length)
 808                                         return false;
 809                                 for (int i = 0; i < gr_mem.Length; ++i)
 810                                         if (gr_mem[i] != g.gr_mem[i])
 811                                                 return false;
 812                                 return true;
 813                         }
 814                         return false;
 815                 }
 816
 817                 // Generate string in /etc/group format
 818                 public override string ToString ()
 819                 {
 820                         StringBuilder sb = new StringBuilder ();
 821                         sb.AppendFormat ("{0}:{1}:{2}:", gr_name, gr_passwd, gr_gid);
 822                         GetMembers (sb, gr_mem);
 823                         return sb.ToString ();
 824                 }
 825
 826                 private static void GetMembers (StringBuilder sb, string[] members)
 827                 {
 828                         if (members.Length > 0)
 829                                 sb.Append (members[0]);
 830                         for (int i = 1; i < members.Length; ++i) {
 831                                 sb.Append (",");
 832                                 sb.Append (members[i]);
 833                         }
 834                 }
 835
 836                 public static bool operator== (Group lhs, Group rhs)
 837                 {
 838                         return Object.Equals (lhs, rhs);
 839                 }
 840
 841                 public static bool operator!= (Group lhs, Group rhs)
 842                 {
 843                         return !Object.Equals (lhs, rhs);
 844                 }
 845         }
 846
 847         public sealed class Passwd
 848         {
 849                 public string           pw_name;
 850                 public string           pw_passwd;
 851                 public /* uid_t */ uint pw_uid;
 852                 public /* gid_t */ uint pw_gid;
 853                 public string           pw_gecos;
 854                 public string           pw_dir;
 855                 public string           pw_shell;
 856
 857                 public override int GetHashCode ()
 858                 {
 859                         return pw_name.GetHashCode () ^ pw_passwd.GetHashCode () ^
 860                                 pw_uid.GetHashCode () ^ pw_gid.GetHashCode () ^
 861                                 pw_gecos.GetHashCode () ^ pw_dir.GetHashCode () ^
 862                                 pw_dir.GetHashCode () ^ pw_shell.GetHashCode ();
 863                 }
 864
 865                 public override bool Equals (object obj)
 866                 {
 867                         if (obj == null || GetType() != obj.GetType())
 868                                 return false;
 869                         Passwd p = (Passwd) obj;
 870                         return p.pw_uid == pw_uid && p.pw_gid == pw_gid && p.pw_name == pw_name &&
 871                                 p.pw_passwd == pw_passwd && p.pw_gecos == pw_gecos &&
 872                                 p.pw_dir == pw_dir && p.pw_shell == pw_shell;
 873                 }
 874
 875                 // Generate string in /etc/passwd format
 876                 public override string ToString ()
 877                 {
 878                         return string.Format ("{0}:{1}:{2}:{3}:{4}:{5}:{6}",
 879                                 pw_name, pw_passwd, pw_uid, pw_gid, pw_gecos, pw_dir, pw_shell);
 880                 }
 881
 882                 public static bool operator== (Passwd lhs, Passwd rhs)
 883                 {
 884                         return Object.Equals (lhs, rhs);
 885                 }
 886
 887                 public static bool operator!= (Passwd lhs, Passwd rhs)
 888                 {
 889                         return !Object.Equals (lhs, rhs);
 890                 }
 891         }
 892
 893         //
 894         // Convention: Functions *not* part of the standard C library AND part of
 895         // a POSIX and/or Unix standard (X/Open, SUS, XPG, etc.) go here.
 896         //
 897         // For example, the man page should be similar to:
 898         //
 899         //    CONFORMING TO (or CONFORMS TO)
 900         //           XPG2, SUSv2, POSIX, etc.
 901         //
 902         // BSD- and GNU-specific exports can also be placed here.
 903         //
 904         // Non-POSIX/XPG/etc. functions can also be placed here if:
 905         //  (a) They'd be likely to be covered in a Steven's-like book
 906         //  (b) The functions would be present in libc.so (or equivalent).
 907         //
 908         // If a function has its own library, that's a STRONG indicator that the
 909         // function should get a different binding, probably in its own assembly,
 910         // so that package management can work sanely.  (That is, we'd like to avoid
 911         // scenarios where FooLib.dll is installed, but it requires libFooLib.so to
 912         // run, and libFooLib.so doesn't exist.  That would be confusing.)
 913         //
 914         // The only methods in here should be:
 915         //  (1) low-level functions
 916         //  (2) "Trivial" function overloads.  For example, if the parameters to a
 917         //      function are related (e.g. getgroups(2))
 918         //  (3) The return type SHOULD NOT be changed.  If you want to provide a
 919         //      convenience function with a nicer return type, place it into one of
 920         //      the Unix* wrapper classes, and give it a .NET-styled name.
 921         //  (4) Exceptions SHOULD NOT be thrown.  EXCEPTIONS:
 922         //      - If you're wrapping *broken* methods which make assumptions about
 923         //        input data, such as that an argument refers to N bytes of data.
 924         //        This is currently limited to cuserid(3) and encrypt(3).
 925         //      - If you call functions which themselves generate exceptions.
 926         //        This is the case for using UnixConvert, which will throw an
 927         //        exception if an invalid/unsupported value is used.
 928         //
 929         public sealed class Syscall : Stdlib
 930         {
 931                 new internal const string LIBC  = "libc";
 932                     private  const string CRYPT = "crypt";
 933
 934                 private Syscall () {}
 935
 936                 //
 937                 // <aio.h>
 938                 //
 939
 940                 // TODO: aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3),
 941                 // aio_return(3), aio_suspend(3), aio_write(3)
 942                 //
 943                 // Then update UnixStream.BeginRead to use the aio* functions.
 944
 945
 946                 #region <attr/xattr.h> Declarations
 947                 //
 948                 // <attr/xattr.h> -- COMPLETE
 949                 //
 950
 951                 // setxattr(2)
 952                 //    int setxattr (const char *path, const char *name,
 953                 //        const void *value, size_t size, int flags);
 954                 [DllImport (MPH, SetLastError=true,
 955                                 EntryPoint="Mono_Posix_Syscall_setxattr")]
 956                 public static extern int setxattr (string path, string name, byte[] value, ulong size, XattrFlags flags);
 957
 958                 public static int setxattr (string path, string name, byte [] value, XattrFlags flags)
 959                 {
 960                         return setxattr (path, name, value, (ulong) value.Length, flags);
 961                 }
 962
 963                 // lsetxattr(2)
 964                 //        int lsetxattr (const char *path, const char *name,
 965                 //                   const void *value, size_t size, int flags);
 966                 [DllImport (MPH, SetLastError=true,
 967                                 EntryPoint="Mono_Posix_Syscall_lsetxattr")]
 968                 public static extern int lsetxattr (string path, string name, byte[] value, ulong size, XattrFlags flags);
 969
 970                 public static int lsetxattr (string path, string name, byte [] value, XattrFlags flags)
 971                 {
 972                         return lsetxattr (path, name, value, (ulong) value.Length, flags);
 973                 }
 974
 975                 // fsetxattr(2)
 976                 //        int fsetxattr (int fd, const char *name,
 977                 //                   const void *value, size_t size, int flags);
 978                 [DllImport (MPH, SetLastError=true,
 979                                 EntryPoint="Mono_Posix_Syscall_fsetxattr")]
 980                 public static extern int fsetxattr (int fd, string name, byte[] value, ulong size, XattrFlags flags);
 981
 982                 public static int fsetxattr (int fd, string name, byte [] value, XattrFlags flags)
 983                 {
 984                         return fsetxattr (fd, name, value, (ulong) value.Length, flags);
 985                 }
 986
 987                 // getxattr(2)
 988                 //        ssize_t getxattr (const char *path, const char *name,
 989                 //                      void *value, size_t size);
 990                 [DllImport (MPH, SetLastError=true,
 991                                 EntryPoint="Mono_Posix_Syscall_getxattr")]
 992                 public static extern long getxattr (string path, string name, byte[] value, ulong size);
 993
 994                 public static long getxattr (string path, string name, byte [] value)
 995                 {
 996                         return getxattr (path, name, value, (ulong) value.Length);
 997                 }
 998
 999                 public static long getxattr (string path, string name, out byte [] value)
1000                 {
1001                         value = null;
1002                         long size = getxattr (path, name, value, 0);
1003                         if (size <= 0)
1004                                 return size;
1005
1006                         value = new byte [size];
1007                         return getxattr (path, name, value, (ulong) size);
1008                 }
1009
1010                 // lgetxattr(2)
1011                 //        ssize_t lgetxattr (const char *path, const char *name,
1012                 //                       void *value, size_t size);
1013                 [DllImport (MPH, SetLastError=true,
1014                                 EntryPoint="Mono_Posix_Syscall_lgetxattr")]
1015                 public static extern long lgetxattr (string path, string name, byte[] value, ulong size);
1016
1017                 public static long lgetxattr (string path, string name, byte [] value)
1018                 {
1019                         return lgetxattr (path, name, value, (ulong) value.Length);
1020                 }
1021
1022                 public static long lgetxattr (string path, string name, out byte [] value)
1023                 {
1024                         value = null;
1025                         long size = lgetxattr (path, name, value, 0);
1026                         if (size <= 0)
1027                                 return size;
1028
1029                         value = new byte [size];
1030                         return lgetxattr (path, name, value, (ulong) size);
1031                 }
1032
1033                 // fgetxattr(2)
1034                 //        ssize_t fgetxattr (int fd, const char *name, void *value, size_t size);
1035                 [DllImport (MPH, SetLastError=true,
1036                                 EntryPoint="Mono_Posix_Syscall_fgetxattr")]
1037                 public static extern long fgetxattr (int fd, string name, byte[] value, ulong size);
1038
1039                 public static long fgetxattr (int fd, string name, byte [] value)
1040                 {
1041                         return fgetxattr (fd, name, value, (ulong) value.Length);
1042                 }
1043
1044                 public static long fgetxattr (int fd, string name, out byte [] value)
1045                 {
1046                         value = null;
1047                         long size = fgetxattr (fd, name, value, 0);
1048                         if (size <= 0)
1049                                 return size;
1050
1051                         value = new byte [size];
1052                         return fgetxattr (fd, name, value, (ulong) size);
1053                 }
1054
1055                 // listxattr(2)
1056                 //        ssize_t listxattr (const char *path, char *list, size_t size);
1057                 [DllImport (MPH, SetLastError=true,
1058                                 EntryPoint="Mono_Posix_Syscall_listxattr")]
1059                 public static extern long listxattr (string path, byte[] list, ulong size);
1060
1061                 // Slight modification: returns 0 on success, negative on error
1062                 public static long listxattr (string path, Encoding encoding, out string [] values)
1063                 {
1064                         values = null;
1065                         long size = listxattr (path, null, 0);
1066                         if (size == 0)
1067                                 values = new string [0];
1068                         if (size <= 0)
1069                                 return (int) size;
1070
1071                         byte[] list = new byte [size];
1072                         long ret = listxattr (path, list, (ulong) size);
1073                         if (ret < 0)
1074                                 return (int) ret;
1075
1076                         string [] output = encoding.GetString (list).Split((char) 0);
1077                         values = new string [output.Length - 1];
1078                         Array.Copy (output, 0, values, 0, output.Length - 1);
1079                         return 0;
1080                 }
1081
1082                 // llistxattr(2)
1083                 //        ssize_t llistxattr (const char *path, char *list, size_t size);
1084                 [DllImport (MPH, SetLastError=true,
1085                                 EntryPoint="Mono_Posix_Syscall_llistxattr")]
1086                 public static extern long llistxattr (string path, byte[] list, ulong size);
1087
1088                 // Slight modification: returns 0 on success, negative on error
1089                 public static long llistxattr (string path, Encoding encoding, out string [] values)
1090                 {
1091                         values = null;
1092                         long size = llistxattr (path, null, 0);
1093                         if (size == 0)
1094                                 values = new string [0];
1095                         if (size <= 0)
1096                                 return (int) size;
1097
1098                         byte[] list = new byte [size];
1099                         long ret = llistxattr (path, list, (ulong) size);
1100                         if (ret < 0)
1101                                 return (int) ret;
1102
1103                         string [] output = encoding.GetString (list).Split((char) 0);
1104                         values = new string [output.Length - 1];
1105                         Array.Copy (output, 0, values, 0, output.Length - 1);
1106                         return 0;
1107                 }
1108
1109                 // flistxattr(2)
1110                 //        ssize_t flistxattr (int fd, char *list, size_t size);
1111                 [DllImport (MPH, SetLastError=true,
1112                                 EntryPoint="Mono_Posix_Syscall_flistxattr")]
1113                 public static extern long flistxattr (int fd, byte[] list, ulong size);
1114
1115                 // Slight modification: returns 0 on success, negative on error
1116                 public static long flistxattr (int fd, Encoding encoding, out string [] values)
1117                 {
1118                         values = null;
1119                         long size = flistxattr (fd, null, 0);
1120                         if (size == 0)
1121                                 values = new string [0];
1122                         if (size <= 0)
1123                                 return (int) size;
1124
1125                         byte[] list = new byte [size];
1126                         long ret = flistxattr (fd, list, (ulong) size);
1127                         if (ret < 0)
1128                                 return (int) ret;
1129
1130                         string [] output = encoding.GetString (list).Split((char) 0);
1131                         values = new string [output.Length - 1];
1132                         Array.Copy (output, 0, values, 0, output.Length - 1);
1133                         return 0;
1134                 }
1135
1136                 [DllImport (LIBC, SetLastError=true)]
1137                 public static extern int removexattr (string path, string name);
1138
1139                 [DllImport (LIBC, SetLastError=true)]
1140                 public static extern int lremovexattr (string path, string name);
1141
1142                 [DllImport (LIBC, SetLastError=true)]
1143                 public static extern int fremovexattr (int fd, string name);
1144                 #endregion
1145
1146                 #region <dirent.h> Declarations
1147                 //
1148                 // <dirent.h>
1149                 //
1150                 // TODO: scandir(3), alphasort(3), versionsort(3), getdirentries(3)
1151
1152                 [DllImport (LIBC, SetLastError=true)]
1153                 public static extern IntPtr opendir (string name);
1154
1155                 [DllImport (LIBC, SetLastError=true)]
1156                 public static extern int closedir (IntPtr dir);
1157
1158                 // seekdir(3):
1159                 //    void seekdir (DIR *dir, off_t offset);
1160                 //    Slight modification.  Returns -1 on error, 0 on success.
1161                 [DllImport (MPH, SetLastError=true,
1162                                 EntryPoint="Mono_Posix_Syscall_seekdir")]
1163                 public static extern int seekdir (IntPtr dir, long offset);
1164
1165                 // telldir(3)
1166                 //    off_t telldir(DIR *dir);
1167                 [DllImport (MPH, SetLastError=true,
1168                                 EntryPoint="Mono_Posix_Syscall_telldir")]
1169                 public static extern long telldir (IntPtr dir);
1170
1171                 [DllImport (LIBC, SetLastError=true)]
1172                 public static extern void rewinddir (IntPtr dir);
1173
1174                 private struct _Dirent {
1175                         public /* ino_t */ ulong  d_ino;
1176                         public /* off_t */ long   d_off;
1177                         public ushort             d_reclen;
1178                         public byte               d_type;
1179                         public IntPtr             d_name;
1180                 }
1181
1182                 private static void CopyDirent (Dirent to, ref _Dirent from)
1183                 {
1184                         try {
1185                                 to.d_ino    = from.d_ino;
1186                                 to.d_off    = from.d_off;
1187                                 to.d_reclen = from.d_reclen;
1188                                 to.d_type   = from.d_type;
1189                                 to.d_name   = UnixMarshal.PtrToString (from.d_name);
1190                         }
1191                         finally {
1192                                 Stdlib.free (from.d_name);
1193                                 from.d_name = IntPtr.Zero;
1194                         }
1195                 }
1196
1197                 [DllImport (MPH, SetLastError=true,
1198                                 EntryPoint="Mono_Posix_Syscall_readdir")]
1199                 private static extern int sys_readdir (IntPtr dir, out _Dirent dentry);
1200
1201                 public static Dirent readdir (IntPtr dir)
1202                 {
1203                         _Dirent dentry;
1204                         int r = sys_readdir (dir, out dentry);
1205                         if (r != 0)
1206                                 return null;
1207                         Dirent d = new Dirent ();
1208                         CopyDirent (d, ref dentry);
1209                         return d;
1210                 }
1211
1212                 [DllImport (MPH, SetLastError=true,
1213                                 EntryPoint="Mono_Posix_Syscall_readdir_r")]
1214                 private static extern int sys_readdir_r (IntPtr dirp, out _Dirent entry, out IntPtr result);
1215
1216                 public static int readdir_r (IntPtr dirp, Dirent entry, out IntPtr result)
1217                 {
1218                         entry.d_ino    = 0;
1219                         entry.d_off    = 0;
1220                         entry.d_reclen = 0;
1221                         entry.d_type   = 0;
1222                         entry.d_name   = null;
1223
1224                         _Dirent _d;
1225                         int r = sys_readdir_r (dirp, out _d, out result);
1226
1227                         if (r == 0 && result != IntPtr.Zero) {
1228                                 CopyDirent (entry, ref _d);
1229                         }
1230
1231                         return r;
1232                 }
1233
1234                 [DllImport (LIBC, SetLastError=true)]
1235                 public static extern int dirfd (IntPtr dir);
1236                 #endregion
1237
1238                 #region <fcntl.h> Declarations
1239                 //
1240                 // <fcntl.h> -- COMPLETE
1241                 //
1242
1243                 [DllImport (MPH, SetLastError=true,
1244                                 EntryPoint="Mono_Posix_Syscall_fcntl")]
1245                 public static extern int fcntl (int fd, FcntlCommand cmd);
1246
1247                 [DllImport (MPH, SetLastError=true,
1248                                 EntryPoint="Mono_Posix_Syscall_fcntl_arg")]
1249                 public static extern int fcntl (int fd, FcntlCommand cmd, long arg);
1250
1251                 [DllImport (MPH, SetLastError=true,
1252                                 EntryPoint="Mono_Posix_Syscall_fcntl_lock")]
1253                 public static extern int fcntl (int fd, FcntlCommand cmd, ref Flock @lock);
1254
1255                 [DllImport (MPH, SetLastError=true,
1256                                 EntryPoint="Mono_Posix_Syscall_open")]
1257                 public static extern int open (string pathname, OpenFlags flags);
1258
1259                 // open(2)
1260                 //    int open(const char *pathname, int flags, mode_t mode);
1261                 [DllImport (MPH, SetLastError=true,
1262                                 EntryPoint="Mono_Posix_Syscall_open_mode")]
1263                 public static extern int open (string pathname, OpenFlags flags, FilePermissions mode);
1264
1265                 // creat(2)
1266                 //    int creat(const char *pathname, mode_t mode);
1267                 [DllImport (MPH, SetLastError=true,
1268                                 EntryPoint="Mono_Posix_Syscall_creat")]
1269                 public static extern int creat (string pathname, FilePermissions mode);
1270
1271                 // posix_fadvise(2)
1272                 //    int posix_fadvise(int fd, off_t offset, off_t len, int advice);
1273                 [DllImport (MPH, SetLastError=true,
1274                                 EntryPoint="Mono_Posix_Syscall_posix_fadvise")]
1275                 public static extern int posix_fadvise (int fd, long offset,
1276                         long len, PosixFadviseAdvice advice);
1277
1278                 // posix_fallocate(P)
1279                 //    int posix_fallocate(int fd, off_t offset, size_t len);
1280                 [DllImport (MPH, SetLastError=true,
1281                                 EntryPoint="Mono_Posix_Syscall_posix_fallocate")]
1282                 public static extern int posix_fallocate (int fd, long offset, long len);
1283                 #endregion
1284
1285                 #region <fstab.h> Declarations
1286                 //
1287                 // <fstab.h>  -- COMPLETE
1288                 //
1289                 private struct _Fstab {
1290                         public IntPtr fs_spec;
1291                         public IntPtr fs_file;
1292                         public IntPtr fs_vfstype;
1293                         public IntPtr fs_mntops;
1294                         public IntPtr fs_type;
1295                         public int    fs_freq;
1296                         public int    fs_passno;
1297                         public IntPtr _fs_buf_;
1298                 }
1299
1300                 private static void CopyFstab (Fstab to, ref _Fstab from)
1301                 {
1302                         try {
1303                                 to.fs_spec     = UnixMarshal.PtrToString (from.fs_spec);
1304                                 to.fs_file     = UnixMarshal.PtrToString (from.fs_file);
1305                                 to.fs_vfstype  = UnixMarshal.PtrToString (from.fs_vfstype);
1306                                 to.fs_mntops   = UnixMarshal.PtrToString (from.fs_mntops);
1307                                 to.fs_type     = UnixMarshal.PtrToString (from.fs_type);
1308                                 to.fs_freq     = from.fs_freq;
1309                                 to.fs_passno   = from.fs_passno;
1310                         }
1311                         finally {
1312                                 Stdlib.free (from._fs_buf_);
1313                                 from._fs_buf_ = IntPtr.Zero;
1314                         }
1315                 }
1316
1317                 [DllImport (MPH, SetLastError=true,
1318                                 EntryPoint="Mono_Posix_Syscall_endfsent")]
1319                 public static extern void endfsent ();
1320
1321                 [DllImport (MPH, SetLastError=true,
1322                                 EntryPoint="Mono_Posix_Syscall_getfsent")]
1323                 private static extern int sys_getfsent (out _Fstab fs);
1324
1325                 public static Fstab getfsent ()
1326                 {
1327                         _Fstab fsbuf;
1328                         int r = sys_getfsent (out fsbuf);
1329                         if (r != 0)
1330                                 return null;
1331                         Fstab fs = new Fstab ();
1332                         CopyFstab (fs, ref fsbuf);
1333                         return fs;
1334                 }
1335
1336                 [DllImport (MPH, SetLastError=true,
1337                                 EntryPoint="Mono_Posix_Syscall_getfsfile")]
1338                 private static extern int sys_getfsfile (string mount_point, out _Fstab fs);
1339
1340                 public static Fstab getfsfile (string mount_point)
1341                 {
1342                         _Fstab fsbuf;
1343                         int r = sys_getfsfile (mount_point, out fsbuf);
1344                         if (r != 0)
1345                                 return null;
1346                         Fstab fs = new Fstab ();
1347                         CopyFstab (fs, ref fsbuf);
1348                         return fs;
1349                 }
1350
1351                 [DllImport (MPH, SetLastError=true,
1352                                 EntryPoint="Mono_Posix_Syscall_getfsspec")]
1353                 private static extern int sys_getfsspec (string special_file, out _Fstab fs);
1354
1355                 public static Fstab getfsspec (string special_file)
1356                 {
1357                         _Fstab fsbuf;
1358                         int r = sys_getfsspec (special_file, out fsbuf);
1359                         if (r != 0)
1360                                 return null;
1361                         Fstab fs = new Fstab ();
1362                         CopyFstab (fs, ref fsbuf);
1363                         return fs;
1364                 }
1365
1366                 [DllImport (MPH, SetLastError=true,
1367                                 EntryPoint="Mono_Posix_Syscall_setfsent")]
1368                 public static extern int setfsent ();
1369
1370                 #endregion
1371
1372                 #region <grp.h> Declarations
1373                 //
1374                 // <grp.h>
1375                 //
1376                 // TODO: putgrent(3), fgetgrent_r(), getgrouplist(2), initgroups(3)
1377
1378                 // setgroups(2)
1379                 //    int setgroups (size_t size, const gid_t *list);
1380                 [DllImport (MPH, SetLastError=true,
1381                                 EntryPoint="Mono_Posix_Syscall_setgroups")]
1382                 public static extern int setgroups (ulong size, uint[] list);
1383
1384                 public static int setgroups (uint [] list)
1385                 {
1386                         return setgroups ((ulong) list.Length, list);
1387                 }
1388
1389                 private struct _Group
1390                 {
1391                         public IntPtr           gr_name;
1392                         public IntPtr           gr_passwd;
1393                         public /* gid_t */ uint gr_gid;
1394                         public int              _gr_nmem_;
1395                         public IntPtr           gr_mem;
1396                         public IntPtr           _gr_buf_;
1397                 }
1398
1399                 private static void CopyGroup (Group to, ref _Group from)
1400                 {
1401                         try {
1402                                 to.gr_gid    = from.gr_gid;
1403                                 to.gr_name   = UnixMarshal.PtrToString (from.gr_name);
1404                                 to.gr_passwd = UnixMarshal.PtrToString (from.gr_passwd);
1405                                 to.gr_mem    = UnixMarshal.PtrToStringArray (from._gr_nmem_, from.gr_mem);
1406                         }
1407                         finally {
1408                                 Stdlib.free (from.gr_mem);
1409                                 Stdlib.free (from._gr_buf_);
1410                                 from.gr_mem   = IntPtr.Zero;
1411                                 from._gr_buf_ = IntPtr.Zero;
1412                         }
1413                 }
1414
1415                 [DllImport (MPH, SetLastError=true,
1416                                 EntryPoint="Mono_Posix_Syscall_getgrnam")]
1417                 private static extern int sys_getgrnam (string name, out _Group group);
1418
1419                 public static Group getgrnam (string name)
1420                 {
1421                         _Group group;
1422                         int r = sys_getgrnam (name, out group);
1423                         if (r != 0)
1424                                 return null;
1425                         Group gr = new Group ();
1426                         CopyGroup (gr, ref group);
1427                         return gr;
1428                 }
1429
1430                 // getgrgid(3)
1431                 //    struct group *getgrgid(gid_t gid);
1432                 [DllImport (MPH, SetLastError=true,
1433                                 EntryPoint="Mono_Posix_Syscall_getgrgid")]
1434                 private static extern int sys_getgrgid (uint uid, out _Group group);
1435
1436                 public static Group getgrgid (uint uid)
1437                 {
1438                         _Group group;
1439                         int r = sys_getgrgid (uid, out group);
1440                         if (r != 0)
1441                                 return null;
1442                         Group gr = new Group ();
1443                         CopyGroup (gr, ref group);
1444                         return gr;
1445                 }
1446
1447                 [DllImport (MPH, SetLastError=true,
1448                                 EntryPoint="Mono_Posix_Syscall_getgrnam_r")]
1449                 private static extern int sys_getgrnam_r (string name, out _Group grbuf, out IntPtr grbufp);
1450
1451                 public static int getgrnam_r (string name, Group grbuf, out Group grbufp)
1452                 {
1453                         grbufp = null;
1454                         _Group group;
1455                         IntPtr _grbufp;
1456                         int r = sys_getgrnam_r (name, out group, out _grbufp);
1457                         if (r == 0 && _grbufp != IntPtr.Zero) {
1458                                 CopyGroup (grbuf, ref group);
1459                                 grbufp = grbuf;
1460                         }
1461                         return r;
1462                 }
1463
1464                 // getgrgid_r(3)
1465                 //    int getgrgid_r(gid_t gid, struct group *gbuf, char *buf,
1466                 //        size_t buflen, struct group **gbufp);
1467                 [DllImport (MPH, SetLastError=true,
1468                                 EntryPoint="Mono_Posix_Syscall_getgrgid_r")]
1469                 private static extern int sys_getgrgid_r (uint uid, out _Group grbuf, out IntPtr grbufp);
1470
1471                 public static int getgrgid_r (uint uid, Group grbuf, out Group grbufp)
1472                 {
1473                         grbufp = null;
1474                         _Group group;
1475                         IntPtr _grbufp;
1476                         int r = sys_getgrgid_r (uid, out group, out _grbufp);
1477                         if (r == 0 && _grbufp != IntPtr.Zero) {
1478                                 CopyGroup (grbuf, ref group);
1479                                 grbufp = grbuf;
1480                         }
1481                         return r;
1482                 }
1483
1484                 [DllImport (MPH, SetLastError=true,
1485                                 EntryPoint="Mono_Posix_Syscall_getgrent")]
1486                 private static extern int sys_getgrent (out _Group grbuf);
1487
1488                 public static Group getgrent ()
1489                 {
1490                         _Group group;
1491                         int r = sys_getgrent (out group);
1492                         if (r != 0)
1493                                 return null;
1494                         Group gr = new Group();
1495                         CopyGroup (gr, ref group);
1496                         return gr;
1497                 }
1498
1499                 [DllImport (LIBC, SetLastError=true)]
1500                 public static extern void setgrent ();
1501
1502                 [DllImport (LIBC, SetLastError=true)]
1503                 public static extern void endgrent ();
1504
1505                 [DllImport (MPH, SetLastError=true,
1506                                 EntryPoint="Mono_Posix_Syscall_fgetgrent")]
1507                 private static extern int sys_fgetgrent (IntPtr stream, out _Group grbuf);
1508
1509                 public static Group fgetgrent (IntPtr stream)
1510                 {
1511                         _Group group;
1512                         int r = sys_fgetgrent (stream, out group);
1513                         if (r != 0)
1514                                 return null;
1515                         Group gr = new Group ();
1516                         CopyGroup (gr, ref group);
1517                         return gr;
1518                 }
1519                 #endregion
1520
1521                 #region <pwd.h> Declarations
1522                 //
1523                 // <pwd.h>
1524                 //
1525                 // TODO: putpwent(3), fgetpwent_r()
1526                 //
1527                 // SKIPPING: getpw(3): it's dangerous.  Use getpwuid(3) instead.
1528
1529                 private struct _Passwd
1530                 {
1531                         public IntPtr           pw_name;
1532                         public IntPtr           pw_passwd;
1533                         public /* uid_t */ uint pw_uid;
1534                         public /* gid_t */ uint pw_gid;
1535                         public IntPtr           pw_gecos;
1536                         public IntPtr           pw_dir;
1537                         public IntPtr           pw_shell;
1538                         public IntPtr           _pw_buf_;
1539                 }
1540
1541                 private static void CopyPasswd (Passwd to, ref _Passwd from)
1542                 {
1543                         try {
1544                                 to.pw_name   = UnixMarshal.PtrToString (from.pw_name);
1545                                 to.pw_passwd = UnixMarshal.PtrToString (from.pw_passwd);
1546                                 to.pw_uid    = from.pw_uid;
1547                                 to.pw_gid    = from.pw_gid;
1548                                 to.pw_gecos  = UnixMarshal.PtrToString (from.pw_gecos);
1549                                 to.pw_dir    = UnixMarshal.PtrToString (from.pw_dir);
1550                                 to.pw_shell  = UnixMarshal.PtrToString (from.pw_shell);
1551                         }
1552                         finally {
1553                                 Stdlib.free (from._pw_buf_);
1554                                 from._pw_buf_ = IntPtr.Zero;
1555                         }
1556                 }
1557
1558                 [DllImport (MPH, SetLastError=true,
1559                                 EntryPoint="Mono_Posix_Syscall_getpwnam")]
1560                 private static extern int sys_getpwnam (string name, out _Passwd passwd);
1561
1562                 public static Passwd getpwnam (string name)
1563                 {
1564                         _Passwd passwd;
1565                         int r = sys_getpwnam (name, out passwd);
1566                         if (r != 0)
1567                                 return null;
1568                         Passwd pw = new Passwd ();
1569                         CopyPasswd (pw, ref passwd);
1570                         return pw;
1571                 }
1572
1573                 // getpwuid(3)
1574                 //    struct passwd *getpwnuid(uid_t uid);
1575                 [DllImport (MPH, SetLastError=true,
1576                                 EntryPoint="Mono_Posix_Syscall_getpwuid")]
1577                 private static extern int sys_getpwuid (uint uid, out _Passwd passwd);
1578
1579                 public static Passwd getpwuid (uint uid)
1580                 {
1581                         _Passwd passwd;
1582                         int r = sys_getpwuid (uid, out passwd);
1583                         if (r != 0)
1584                                 return null;
1585                         Passwd pw = new Passwd ();
1586                         CopyPasswd (pw, ref passwd);
1587                         return pw;
1588                 }
1589
1590                 [DllImport (MPH, SetLastError=true,
1591                                 EntryPoint="Mono_Posix_Syscall_getpwnam_r")]
1592                 private static extern int sys_getpwnam_r (string name, out _Passwd pwbuf, out IntPtr pwbufp);
1593
1594                 public static int getpwnam_r (string name, Passwd pwbuf, out Passwd pwbufp)
1595                 {
1596                         pwbufp = null;
1597                         _Passwd passwd;
1598                         IntPtr _pwbufp;
1599                         int r = sys_getpwnam_r (name, out passwd, out _pwbufp);
1600                         if (r == 0 && _pwbufp != IntPtr.Zero) {
1601                                 CopyPasswd (pwbuf, ref passwd);
1602                                 pwbufp = pwbuf;
1603                         }
1604                         return r;
1605                 }
1606
1607                 // getpwuid_r(3)
1608                 //    int getpwuid_r(uid_t uid, struct passwd *pwbuf, char *buf, size_t
1609                 //        buflen, struct passwd **pwbufp);
1610                 [DllImport (MPH, SetLastError=true,
1611                                 EntryPoint="Mono_Posix_Syscall_getpwuid_r")]
1612                 private static extern int sys_getpwuid_r (uint uid, out _Passwd pwbuf, out IntPtr pwbufp);
1613
1614                 public static int getpwuid_r (uint uid, Passwd pwbuf, out Passwd pwbufp)
1615                 {
1616                         pwbufp = null;
1617                         _Passwd passwd;
1618                         IntPtr _pwbufp;
1619                         int r = sys_getpwuid_r (uid, out passwd, out _pwbufp);
1620                         if (r == 0 && _pwbufp != IntPtr.Zero) {
1621                                 CopyPasswd (pwbuf, ref passwd);
1622                                 pwbufp = pwbuf;
1623                         }
1624                         return r;
1625                 }
1626
1627                 [DllImport (MPH, SetLastError=true,
1628                                 EntryPoint="Mono_Posix_Syscall_getpwent")]
1629                 private static extern int sys_getpwent (out _Passwd pwbuf);
1630
1631                 public static Passwd getpwent ()
1632                 {
1633                         _Passwd passwd;
1634                         int r = sys_getpwent (out passwd);
1635                         if (r != 0)
1636                                 return null;
1637                         Passwd pw = new Passwd ();
1638                         CopyPasswd (pw, ref passwd);
1639                         return pw;
1640                 }
1641
1642                 [DllImport (LIBC, SetLastError=true)]
1643                 public static extern void setpwent ();
1644
1645                 [DllImport (LIBC, SetLastError=true)]
1646                 public static extern void endpwent ();
1647
1648                 [DllImport (MPH, SetLastError=true,
1649                                 EntryPoint="Mono_Posix_Syscall_fgetpwent")]
1650                 private static extern int sys_fgetpwent (IntPtr stream, out _Passwd pwbuf);
1651
1652                 public static Passwd fgetpwent (IntPtr stream)
1653                 {
1654                         _Passwd passwd;
1655                         int r = sys_fgetpwent (stream, out passwd);
1656                         if (r != 0)
1657                                 return null;
1658                         Passwd pw = new Passwd ();
1659                         CopyPasswd (pw, ref passwd);
1660                         return pw;
1661                 }
1662                 #endregion
1663
1664                 #region <signal.h> Declarations
1665                 //
1666                 // <signal.h>
1667                 //
1668                 [DllImport (LIBC, SetLastError=true)]
1669                 private static extern void psignal (int sig, string s);
1670
1671                 public static void psignal (Signum sig, string s)
1672                 {
1673                         int signum = UnixConvert.FromSignum (sig);
1674                         psignal (signum, s);
1675                 }
1676
1677                 // kill(2)
1678                 //    int kill(pid_t pid, int sig);
1679                 [DllImport (LIBC, SetLastError=true, EntryPoint="kill")]
1680                 private static extern int sys_kill (int pid, int sig);
1681
1682                 public static int kill (int pid, Signum sig)
1683                 {
1684                         int _sig = UnixConvert.FromSignum (sig);
1685                         return sys_kill (pid, _sig);
1686                 }
1687
1688                 [DllImport (LIBC, SetLastError=true, EntryPoint="strsignal")]
1689                 private static extern IntPtr sys_strsignal (int sig);
1690
1691                 public static string strsignal (Signum sig)
1692                 {
1693                         int s = UnixConvert.FromSignum (sig);
1694                         IntPtr r = sys_strsignal (s);
1695                         return UnixMarshal.PtrToString (r);
1696                 }
1697
1698                 // TODO: sigaction(2)
1699                 // TODO: sigsuspend(2)
1700                 // TODO: sigpending(2)
1701
1702                 #endregion
1703
1704                 #region <stdio.h> Declarations
1705                 //
1706                 // <stdio.h>
1707                 //
1708                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_L_ctermid")]
1709                 private static extern int _L_ctermid ();
1710
1711                 public static readonly int L_ctermid = _L_ctermid ();
1712
1713                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_L_cuserid")]
1714                 private static extern int _L_cuserid ();
1715
1716                 public static readonly int L_cuserid = _L_cuserid ();
1717
1718                 [DllImport (LIBC, SetLastError=true, EntryPoint="cuserid")]
1719                 private static extern IntPtr sys_cuserid ([Out] StringBuilder @string);
1720
1721                 [Obsolete ("\"Nobody knows precisely what cuserid() does... " +
1722                                 "DO NOT USE cuserid().\n" +
1723                                 "`string' must hold L_cuserid characters.  Use getlogin_r instead.")]
1724                 public static string cuserid (StringBuilder @string)
1725                 {
1726                         if (@string.Capacity < L_cuserid) {
1727                                 throw new ArgumentOutOfRangeException ("string", "string.Capacity < L_cuserid");
1728                         }
1729                         IntPtr r = sys_cuserid (@string);
1730                         return UnixMarshal.PtrToString (r);
1731                 }
1732
1733                 #endregion
1734
1735                 #region <stdlib.h> Declarations
1736                 //
1737                 // <stdlib.h>
1738                 //
1739                 [DllImport (LIBC, SetLastError=true)]
1740                 public static extern int ttyslot ();
1741
1742                 [DllImport (CRYPT, SetLastError=true)]
1743                 public static extern void setkey (string key);
1744
1745                 #endregion
1746
1747                 #region <string.h> Declarations
1748                 //
1749                 // <string.h>
1750                 //
1751
1752                 // strerror_r(3)
1753                 //    int strerror_r(int errnum, char *buf, size_t n);
1754                 [DllImport (MPH, SetLastError=true,
1755                                 EntryPoint="Mono_Posix_Syscall_strerror_r")]
1756                 private static extern int sys_strerror_r (int errnum,
1757                                 [Out] StringBuilder buf, ulong n);
1758
1759                 public static int strerror_r (Error errnum, StringBuilder buf, ulong n)
1760                 {
1761                         int e = UnixConvert.FromError (errnum);
1762                         return sys_strerror_r (e, buf, n);
1763                 }
1764
1765                 public static int strerror_r (Error errnum, StringBuilder buf)
1766                 {
1767                         return strerror_r (errnum, buf, (ulong) buf.Capacity);
1768                 }
1769
1770                 #endregion
1771
1772                 #region <sys/mman.h> Declarations
1773                 //
1774                 // <sys/mman.h>
1775                 //
1776
1777                 // posix_madvise(P)
1778                 //    int posix_madvise(void *addr, size_t len, int advice);
1779                 [DllImport (MPH, SetLastError=true,
1780                                 EntryPoint="Mono_Posix_Syscall_posix_madvise")]
1781                 public static extern int posix_madvise (IntPtr addr, ulong len,
1782                         PosixMadviseAdvice advice);
1783
1784                 #endregion
1785
1786                 #region <sys/poll.h> Declarations
1787                 //
1788                 // <sys/poll.h> -- COMPLETE
1789                 //
1790
1791                 private struct _pollfd {
1792                         public int fd;
1793                         public short events;
1794                         public short revents;
1795                 }
1796
1797                 [DllImport (LIBC, SetLastError=true, EntryPoint="poll")]
1798                 private static extern int sys_poll (_pollfd[] ufds, uint nfds, int timeout);
1799
1800                 public static int poll (Pollfd [] fds, uint nfds, int timeout)
1801                 {
1802                         if (fds.Length < nfds)
1803                                 throw new ArgumentOutOfRangeException ("fds", "Must refer to at least `nfds' elements");
1804
1805                         _pollfd[] send = new _pollfd[nfds];
1806
1807                         for (int i = 0; i < send.Length; i++) {
1808                                 send [i].fd     = fds [i].fd;
1809                                 send [i].events = UnixConvert.FromPollEvents (fds [i].events);
1810                         }
1811
1812                         int r = sys_poll (send, nfds, timeout);
1813
1814                         for (int i = 0; i < send.Length; i++) {
1815                                 fds [i].revents = UnixConvert.ToPollEvents (send [i].revents);
1816                         }
1817
1818                         return r;
1819                 }
1820
1821                 public static int poll (Pollfd [] fds, int timeout)
1822                 {
1823                         return poll (fds, (uint) fds.Length, timeout);
1824                 }
1825
1826                 //
1827                 // <sys/ptrace.h>
1828                 //
1829
1830                 // TODO: ptrace(2)
1831
1832                 //
1833                 // <sys/resource.h>
1834                 //
1835
1836                 // TODO: setrlimit(2)
1837                 // TODO: getrlimit(2)
1838                 // TODO: getrusage(2)
1839
1840                 #endregion
1841
1842                 #region <sys/sendfile.h> Declarations
1843                 //
1844                 // <sys/sendfile.h> -- COMPLETE
1845                 //
1846
1847                 [DllImport (MPH, SetLastError=true,
1848                                 EntryPoint="Mono_Posix_Syscall_sendfile")]
1849                 public static extern long sendfile (int out_fd, int in_fd,
1850                                 ref long offset, ulong count);
1851
1852                 #endregion
1853
1854                 #region <sys/stat.h> Declarations
1855                 //
1856                 // <sys/stat.h>  -- COMPLETE
1857                 //
1858                 [DllImport (MPH, SetLastError=true,
1859                                 EntryPoint="Mono_Posix_Syscall_stat")]
1860                 public static extern int stat (string file_name, out Stat buf);
1861
1862                 [DllImport (MPH, SetLastError=true,
1863                                 EntryPoint="Mono_Posix_Syscall_fstat")]
1864                 public static extern int fstat (int filedes, out Stat buf);
1865
1866                 [DllImport (MPH, SetLastError=true,
1867                                 EntryPoint="Mono_Posix_Syscall_lstat")]
1868                 public static extern int lstat (string file_name, out Stat buf);
1869
1870                 // TODO:
1871                 // S_ISDIR, S_ISCHR, S_ISBLK, S_ISREG, S_ISFIFO, S_ISLNK, S_ISSOCK
1872                 // All take FilePermissions
1873
1874                 // chmod(2)
1875                 //    int chmod(const char *path, mode_t mode);
1876                 [DllImport (LIBC, SetLastError=true, EntryPoint="chmod")]
1877                 private static extern int sys_chmod (string path, uint mode);
1878
1879                 public static int chmod (string path, FilePermissions mode)
1880                 {
1881                         uint _mode = UnixConvert.FromFilePermissions (mode);
1882                         return sys_chmod (path, _mode);
1883                 }
1884
1885                 // fchmod(2)
1886                 //    int chmod(int filedes, mode_t mode);
1887                 [DllImport (LIBC, SetLastError=true, EntryPoint="fchmod")]
1888                 private static extern int sys_fchmod (int filedes, uint mode);
1889
1890                 public static int fchmod (int filedes, FilePermissions mode)
1891                 {
1892                         uint _mode = UnixConvert.FromFilePermissions (mode);
1893                         return sys_fchmod (filedes, _mode);
1894                 }
1895
1896                 // umask(2)
1897                 //    mode_t umask(mode_t mask);
1898                 [DllImport (LIBC, SetLastError=true, EntryPoint="umask")]
1899                 private static extern uint sys_umask (uint mask);
1900
1901                 public static FilePermissions umask (FilePermissions mask)
1902                 {
1903                         uint _mask = UnixConvert.FromFilePermissions (mask);
1904                         uint r = sys_umask (_mask);
1905                         return UnixConvert.ToFilePermissions (r);
1906                 }
1907
1908                 // mkdir(2)
1909                 //    int mkdir(const char *pathname, mode_t mode);
1910                 [DllImport (LIBC, SetLastError=true, EntryPoint="mkdir")]
1911                 private static extern int sys_mkdir (string oldpath, uint mode);
1912
1913                 public static int mkdir (string oldpath, FilePermissions mode)
1914                 {
1915                         uint _mode = UnixConvert.FromFilePermissions (mode);
1916                         return sys_mkdir (oldpath, _mode);
1917                 }
1918
1919                 // mknod(2)
1920                 //    int mknod (const char *pathname, mode_t mode, dev_t dev);
1921                 [DllImport (MPH, SetLastError=true,
1922                                 EntryPoint="Mono_Posix_Syscall_mknod")]
1923                 public static extern int mknod (string pathname, FilePermissions mode, ulong dev);
1924
1925                 // mkfifo(3)
1926                 //    int mkfifo(const char *pathname, mode_t mode);
1927                 [DllImport (LIBC, SetLastError=true, EntryPoint="mkfifo")]
1928                 private static extern int sys_mkfifo (string pathname, uint mode);
1929
1930                 public static int mkfifo (string pathname, FilePermissions mode)
1931                 {
1932                         uint _mode = UnixConvert.FromFilePermissions (mode);
1933                         return sys_mkfifo (pathname, _mode);
1934                 }
1935
1936                 #endregion
1937
1938                 #region <sys/stat.h> Declarations
1939                 //
1940                 // <sys/statvfs.h>
1941                 //
1942
1943                 [DllImport (MPH, SetLastError=true,
1944                                 EntryPoint="Mono_Posix_Syscall_statvfs")]
1945                 public static extern int statvfs (string path, out Statvfs buf);
1946
1947                 [DllImport (MPH, SetLastError=true,
1948                                 EntryPoint="Mono_Posix_Syscall_fstatvfs")]
1949                 public static extern int fstatvfs (int fd, out Statvfs buf);
1950
1951                 #endregion
1952
1953                 #region <sys/time.h> Declarations
1954                 //
1955                 // <sys/time.h>
1956                 //
1957                 // TODO: adjtime(), getitimer(2), setitimer(2), lutimes(), futimes()
1958
1959                 [DllImport (MPH, SetLastError=true,
1960                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1961                 public static extern int gettimeofday (out Timeval tv, out Timezone tz);
1962
1963                 [DllImport (MPH, SetLastError=true,
1964                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1965                 private static extern int gettimeofday (out Timeval tv, IntPtr ignore);
1966
1967                 public static int gettimeofday (out Timeval tv)
1968                 {
1969                         return gettimeofday (out tv, IntPtr.Zero);
1970                 }
1971
1972                 [DllImport (MPH, SetLastError=true,
1973                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1974                 private static extern int gettimeofday (IntPtr ignore, out Timezone tz);
1975
1976                 public static int gettimeofday (out Timezone tz)
1977                 {
1978                         return gettimeofday (IntPtr.Zero, out tz);
1979                 }
1980
1981                 [DllImport (MPH, SetLastError=true,
1982                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1983                 public static extern int settimeofday (ref Timeval tv, ref Timezone tz);
1984
1985                 [DllImport (MPH, SetLastError=true,
1986                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1987                 private static extern int settimeofday (ref Timeval tv, IntPtr ignore);
1988
1989                 public static int settimeofday (ref Timeval tv)
1990                 {
1991                         return settimeofday (ref tv, IntPtr.Zero);
1992                 }
1993
1994                 [DllImport (MPH, SetLastError=true,
1995                                 EntryPoint="Mono_Posix_Syscall_utimes")]
1996                 public static extern int utimes (string filename, ref Timeval tvp);
1997
1998                 #endregion
1999
2000                 //
2001                 // <sys/timeb.h>
2002                 //
2003
2004                 // TODO: ftime(3)
2005
2006                 //
2007                 // <sys/times.h>
2008                 //
2009
2010                 // TODO: times(2)
2011
2012                 #region <sys/wait.h> Declarations
2013                 //
2014                 // <sys/wait.h>
2015                 //
2016
2017                 // wait(2)
2018                 //    pid_t wait(int *status);
2019                 [DllImport (LIBC, SetLastError=true)]
2020                 public static extern int wait (out int status);
2021
2022                 // waitpid(2)
2023                 //    pid_t waitpid(pid_t pid, int *status, int options);
2024                 [DllImport (LIBC, SetLastError=true)]
2025                 private static extern int waitpid (int pid, out int status, int options);
2026
2027                 public static int waitpid (int pid, out int status, WaitOptions options)
2028                 {
2029                         int _options = UnixConvert.FromWaitOptions (options);
2030                         return waitpid (pid, out status, _options);
2031                 }
2032
2033                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WIFEXITED")]
2034                 private static extern int _WIFEXITED (int status);
2035
2036                 public static bool WIFEXITED (int status)
2037                 {
2038                         return _WIFEXITED (status) != 0;
2039                 }
2040
2041                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WEXITSTATUS")]
2042                 public static extern int WEXITSTATUS (int status);
2043
2044                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WIFSIGNALED")]
2045                 private static extern int _WIFSIGNALED (int status);
2046
2047                 public static bool WIFSIGNALED (int status)
2048                 {
2049                         return _WIFSIGNALED (status) != 0;
2050                 }
2051
2052                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WTERMSIG")]
2053                 private static extern int _WTERMSIG (int status);
2054
2055                 public static Signum WTERMSIG (int status)
2056                 {
2057                         int r = _WTERMSIG (status);
2058                         return UnixConvert.ToSignum (r);
2059                 }
2060
2061                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WIFSTOPPED")]
2062                 private static extern int _WIFSTOPPED (int status);
2063
2064                 public static bool WIFSTOPPED (int status)
2065                 {
2066                         return _WIFSTOPPED (status) != 0;
2067                 }
2068
2069                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WSTOPSIG")]
2070                 private static extern int _WSTOPSIG (int status);
2071
2072                 public static Signum WSTOPSIG (int status)
2073                 {
2074                         int r = _WSTOPSIG (status);
2075                         return UnixConvert.ToSignum (r);
2076                 }
2077
2078                 //
2079                 // <termios.h>
2080                 //
2081
2082                 #endregion
2083
2084                 #region <syslog.h> Declarations
2085                 //
2086                 // <syslog.h>
2087                 //
2088
2089                 [DllImport (LIBC, EntryPoint="openlog")]
2090                 private static extern void sys_openlog (IntPtr ident, int option, int facility);
2091
2092                 public static void openlog (IntPtr ident, SyslogOptions option,
2093                                 SyslogFacility defaultFacility)
2094                 {
2095                         int _option   = UnixConvert.FromSyslogOptions (option);
2096                         int _facility = UnixConvert.FromSyslogFacility (defaultFacility);
2097
2098                         sys_openlog (ident, _option, _facility);
2099                 }
2100
2101                 [DllImport (LIBC, EntryPoint="syslog")]
2102                 private static extern void sys_syslog (int priority, string message);
2103
2104                 public static void syslog (SyslogFacility facility, SyslogLevel level, string message)
2105                 {
2106                         int _facility = UnixConvert.FromSyslogFacility (facility);
2107                         int _level = UnixConvert.FromSyslogLevel (level);
2108                         sys_syslog (_facility | _level, GetSyslogMessage (message));
2109                 }
2110
2111                 public static void syslog (SyslogLevel level, string message)
2112                 {
2113                         int _level = UnixConvert.FromSyslogLevel (level);
2114                         sys_syslog (_level, GetSyslogMessage (message));
2115                 }
2116
2117                 private static string GetSyslogMessage (string message)
2118                 {
2119                         return UnixMarshal.EscapeFormatString (message, new char[]{'m'});
2120                 }
2121
2122                 [Obsolete ("Not necessarily portable due to cdecl restrictions.\n" +
2123                                 "Use syslog(SyslogFacility, SyslogLevel, string) instead.")]
2124                 public static void syslog (SyslogFacility facility, SyslogLevel level,
2125                                 string format, params object[] parameters)
2126                 {
2127                         int _facility = UnixConvert.FromSyslogFacility (facility);
2128                         int _level = UnixConvert.FromSyslogLevel (level);
2129
2130                         object[] _parameters = new object[checked(parameters.Length+2)];
2131                         _parameters [0] = _facility | _level;
2132                         _parameters [1] = format;
2133                         Array.Copy (parameters, 0, _parameters, 2, parameters.Length);
2134                         XPrintfFunctions.syslog (_parameters);
2135                 }
2136
2137                 [Obsolete ("Not necessarily portable due to cdecl restrictions.\n" +
2138                                 "Use syslog(SyslogLevel, string) instead.")]
2139                 public static void syslog (SyslogLevel level, string format,
2140                                 params object[] parameters)
2141                 {
2142                         int _level = UnixConvert.FromSyslogLevel (level);
2143
2144                         object[] _parameters = new object[checked(parameters.Length+2)];
2145                         _parameters [0] = _level;
2146                         _parameters [1] = format;
2147                         Array.Copy (parameters, 0, _parameters, 2, parameters.Length);
2148                         XPrintfFunctions.syslog (_parameters);
2149                 }
2150
2151                 [DllImport (LIBC)]
2152                 public static extern void closelog ();
2153
2154                 [DllImport (LIBC, EntryPoint="setlogmask")]
2155                 private static extern int sys_setlogmask (int mask);
2156
2157                 public static int setlogmask (SyslogLevel mask)
2158                 {
2159                         int _mask = UnixConvert.FromSyslogLevel (mask);
2160                         return sys_setlogmask (_mask);
2161                 }
2162
2163                 #endregion
2164
2165                 #region <time.h> Declarations
2166
2167                 //
2168                 // <time.h>
2169                 //
2170
2171                 // stime(2)
2172                 //    int stime(time_t *t);
2173                 [DllImport (MPH, SetLastError=true,
2174                                 EntryPoint="Mono_Posix_Syscall_stime")]
2175                 public static extern int stime (ref long t);
2176
2177                 // time(2)
2178                 //    time_t time(time_t *t);
2179                 [DllImport (MPH, SetLastError=true,
2180                                 EntryPoint="Mono_Posix_Syscall_time")]
2181                 public static extern long time (out long t);
2182
2183                 //
2184                 // <ulimit.h>
2185                 //
2186
2187                 // TODO: ulimit(3)
2188
2189                 #endregion
2190
2191                 #region <unistd.h> Declarations
2192                 //
2193                 // <unistd.h>
2194                 //
2195                 // TODO: euidaccess(), usleep(3), get_current_dir_name(), group_member(),
2196                 //       other TODOs listed below.
2197
2198                 [DllImport (LIBC, SetLastError=true, EntryPoint="access")]
2199                 private static extern int sys_access (string pathname, int mode);
2200
2201                 public static int access (string pathname, AccessMode mode)
2202                 {
2203                         int _mode = UnixConvert.FromAccessMode (mode);
2204                         return sys_access (pathname, _mode);
2205                 }
2206
2207                 // lseek(2)
2208                 //    off_t lseek(int filedes, off_t offset, int whence);
2209                 [DllImport (MPH, SetLastError=true,
2210                                 EntryPoint="Mono_Posix_Syscall_lseek")]
2211                 public static extern long lseek (int fd, long offset, SeekFlags whence);
2212
2213     [DllImport (LIBC, SetLastError=true)]
2214                 public static extern int close (int fd);
2215
2216                 // read(2)
2217                 //    ssize_t read(int fd, void *buf, size_t count);
2218                 [DllImport (MPH, SetLastError=true,
2219                                 EntryPoint="Mono_Posix_Syscall_read")]
2220                 public static extern long read (int fd, IntPtr buf, ulong count);
2221
2222                 public static unsafe long read (int fd, void *buf, ulong count)
2223                 {
2224                         return read (fd, (IntPtr) buf, count);
2225                 }
2226
2227                 // write(2)
2228                 //    ssize_t write(int fd, const void *buf, size_t count);
2229                 [DllImport (MPH, SetLastError=true,
2230                                 EntryPoint="Mono_Posix_Syscall_write")]
2231                 public static extern long write (int fd, IntPtr buf, ulong count);
2232
2233                 public static unsafe long write (int fd, void *buf, ulong count)
2234                 {
2235                         return write (fd, (IntPtr) buf, count);
2236                 }
2237
2238                 // pread(2)
2239                 //    ssize_t pread(int fd, void *buf, size_t count, off_t offset);
2240                 [DllImport (MPH, SetLastError=true,
2241                                 EntryPoint="Mono_Posix_Syscall_pread")]
2242                 public static extern long pread (int fd, IntPtr buf, ulong count, long offset);
2243
2244                 public static unsafe long pread (int fd, void *buf, ulong count, long offset)
2245                 {
2246                         return pread (fd, (IntPtr) buf, count, offset);
2247                 }
2248
2249                 // pwrite(2)
2250                 //    ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
2251                 [DllImport (MPH, SetLastError=true,
2252                                 EntryPoint="Mono_Posix_Syscall_pwrite")]
2253                 public static extern long pwrite (int fd, IntPtr buf, ulong count, long offset);
2254
2255                 public static unsafe long pwrite (int fd, void *buf, ulong count, long offset)
2256                 {
2257                         return pwrite (fd, (IntPtr) buf, count, offset);
2258                 }
2259
2260                 [DllImport (MPH, SetLastError=true,
2261                                 EntryPoint="Mono_Posix_Syscall_pipe")]
2262                 public static extern int pipe (out int reading, out int writing);
2263
2264                 public static int pipe (int[] filedes)
2265                 {
2266                         if (filedes == null || filedes.Length != 2) {
2267                                 // TODO: set errno
2268                                 return -1;
2269                         }
2270                         int reading, writing;
2271                         int r = pipe (out reading, out writing);
2272                         filedes[0] = reading;
2273                         filedes[1] = writing;
2274                         return r;
2275                 }
2276
2277                 [DllImport (LIBC, SetLastError=true)]
2278                 public static extern uint alarm (uint seconds);
2279
2280                 [DllImport (LIBC, SetLastError=true)]
2281                 public static extern uint sleep (uint seconds);
2282
2283                 [DllImport (LIBC, SetLastError=true)]
2284                 public static extern uint ualarm (uint usecs, uint interval);
2285
2286                 [DllImport (LIBC, SetLastError=true)]
2287                 public static extern int pause ();
2288
2289                 // chown(2)
2290                 //    int chown(const char *path, uid_t owner, gid_t group);
2291                 [DllImport (LIBC, SetLastError=true)]
2292                 public static extern int chown (string path, uint owner, uint group);
2293
2294                 // fchown(2)
2295                 //    int fchown(int fd, uid_t owner, gid_t group);
2296                 [DllImport (LIBC, SetLastError=true)]
2297                 public static extern int fchown (int fd, uint owner, uint group);
2298
2299                 // lchown(2)
2300                 //    int lchown(const char *path, uid_t owner, gid_t group);
2301                 [DllImport (LIBC, SetLastError=true)]
2302                 public static extern int lchown (string path, uint owner, uint group);
2303
2304                 [DllImport (LIBC, SetLastError=true)]
2305                 public static extern int chdir (string path);
2306
2307                 [DllImport (LIBC, SetLastError=true)]
2308                 public static extern int fchdir (int fd);
2309
2310                 // getcwd(3)
2311                 //    char *getcwd(char *buf, size_t size);
2312                 [DllImport (MPH, SetLastError=true,
2313                                 EntryPoint="Mono_Posix_Syscall_getcwd")]
2314                 public static extern IntPtr getcwd ([Out] StringBuilder buf, ulong size);
2315
2316                 public static StringBuilder getcwd (StringBuilder buf)
2317                 {
2318                         getcwd (buf, (ulong) buf.Capacity);
2319                         return buf;
2320                 }
2321
2322                 // getwd(2) is deprecated; don't expose it.
2323
2324                 [DllImport (LIBC, SetLastError=true)]
2325                 public static extern int dup (int fd);
2326
2327                 [DllImport (LIBC, SetLastError=true)]
2328                 public static extern int dup2 (int fd, int fd2);
2329
2330                 // TODO: does Mono marshal arrays properly?
2331                 [DllImport (LIBC, SetLastError=true)]
2332                 public static extern int execve (string path, string[] argv, string[] envp);
2333
2334                 [DllImport (LIBC, SetLastError=true)]
2335                 public static extern int fexecve (int fd, string[] argv, string[] envp);
2336
2337                 [DllImport (LIBC, SetLastError=true)]
2338                 public static extern int execv (string path, string[] argv);
2339
2340                 // TODO: execle, execl, execlp
2341                 [DllImport (LIBC, SetLastError=true)]
2342                 public static extern int execvp (string path, string[] argv);
2343
2344                 [DllImport (LIBC, SetLastError=true)]
2345                 public static extern int nice (int inc);
2346
2347                 [DllImport (LIBC, SetLastError=true)]
2348                 public static extern int _exit (int status);
2349
2350                 [DllImport (MPH, SetLastError=true,
2351                                 EntryPoint="Mono_Posix_Syscall_fpathconf")]
2352                 public static extern long fpathconf (int filedes, PathConf name);
2353
2354                 [DllImport (MPH, SetLastError=true,
2355                                 EntryPoint="Mono_Posix_Syscall_pathconf")]
2356                 public static extern long pathconf (string path, PathConf name);
2357
2358                 [DllImport (MPH, SetLastError=true,
2359                                 EntryPoint="Mono_Posix_Syscall_sysconf")]
2360                 public static extern long sysconf (SysConf name);
2361
2362                 // confstr(3)
2363                 //    size_t confstr(int name, char *buf, size_t len);
2364                 [DllImport (MPH, SetLastError=true,
2365                                 EntryPoint="Mono_Posix_Syscall_confstr")]
2366                 public static extern ulong confstr (ConfStr name, [Out] StringBuilder buf, ulong len);
2367
2368                 // getpid(2)
2369                 //    pid_t getpid(void);
2370                 [DllImport (LIBC, SetLastError=true)]
2371                 public static extern int getpid ();
2372
2373                 // getppid(2)
2374                 //    pid_t getppid(void);
2375                 [DllImport (LIBC, SetLastError=true)]
2376                 public static extern int getppid ();
2377
2378                 // setpgid(2)
2379                 //    int setpgid(pid_t pid, pid_t pgid);
2380                 [DllImport (LIBC, SetLastError=true)]
2381                 public static extern int setpgid (int pid, int pgid);
2382
2383                 // getpgid(2)
2384                 //    pid_t getpgid(pid_t pid);
2385                 [DllImport (LIBC, SetLastError=true)]
2386                 public static extern int getpgid (int pid);
2387
2388                 [DllImport (LIBC, SetLastError=true)]
2389                 public static extern int setpgrp ();
2390
2391                 // getpgrp(2)
2392                 //    pid_t getpgrp(void);
2393                 [DllImport (LIBC, SetLastError=true)]
2394                 public static extern int getpgrp ();
2395
2396                 // setsid(2)
2397                 //    pid_t setsid(void);
2398                 [DllImport (LIBC, SetLastError=true)]
2399                 public static extern int setsid ();
2400
2401                 // getsid(2)
2402                 //    pid_t getsid(pid_t pid);
2403                 [DllImport (LIBC, SetLastError=true)]
2404                 public static extern int getsid (int pid);
2405
2406                 // getuid(2)
2407                 //    uid_t getuid(void);
2408                 [DllImport (LIBC, SetLastError=true)]
2409                 public static extern uint getuid ();
2410
2411                 // geteuid(2)
2412                 //    uid_t geteuid(void);
2413                 [DllImport (LIBC, SetLastError=true)]
2414                 public static extern uint geteuid ();
2415
2416                 // getgid(2)
2417                 //    gid_t getgid(void);
2418                 [DllImport (LIBC, SetLastError=true)]
2419                 public static extern uint getgid ();
2420
2421                 // getegid(2)
2422                 //    gid_t getgid(void);
2423                 [DllImport (LIBC, SetLastError=true)]
2424                 public static extern uint getegid ();
2425
2426                 // getgroups(2)
2427                 //    int getgroups(int size, gid_t list[]);
2428                 [DllImport (LIBC, SetLastError=true)]
2429                 public static extern int getgroups (int size, uint[] list);
2430
2431                 public static int getgroups (uint[] list)
2432                 {
2433                         return getgroups (list.Length, list);
2434                 }
2435
2436                 // setuid(2)
2437                 //    int setuid(uid_t uid);
2438                 [DllImport (LIBC, SetLastError=true)]
2439                 public static extern int setuid (uint uid);
2440
2441                 // setreuid(2)
2442                 //    int setreuid(uid_t ruid, uid_t euid);
2443                 [DllImport (LIBC, SetLastError=true)]
2444                 public static extern int setreuid (uint ruid, uint euid);
2445
2446                 // setregid(2)
2447                 //    int setregid(gid_t ruid, gid_t euid);
2448                 [DllImport (LIBC, SetLastError=true)]
2449                 public static extern int setregid (uint rgid, uint egid);
2450
2451                 // seteuid(2)
2452                 //    int seteuid(uid_t euid);
2453                 [DllImport (LIBC, SetLastError=true)]
2454                 public static extern int seteuid (uint euid);
2455
2456                 // setegid(2)
2457                 //    int setegid(gid_t euid);
2458                 [DllImport (LIBC, SetLastError=true)]
2459                 public static extern int setegid (uint uid);
2460
2461                 // setgid(2)
2462                 //    int setgid(gid_t gid);
2463                 [DllImport (LIBC, SetLastError=true)]
2464                 public static extern int setgid (uint gid);
2465
2466                 // getresuid(2)
2467                 //    int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
2468                 [DllImport (LIBC, SetLastError=true)]
2469                 public static extern int getresuid (out uint ruid, out uint euid, out uint suid);
2470
2471                 // getresgid(2)
2472                 //    int getresgid(gid_t *ruid, gid_t *euid, gid_t *suid);
2473                 [DllImport (LIBC, SetLastError=true)]
2474                 public static extern int getresgid (out uint rgid, out uint egid, out uint sgid);
2475
2476                 // setresuid(2)
2477                 //    int setresuid(uid_t ruid, uid_t euid, uid_t suid);
2478                 [DllImport (LIBC, SetLastError=true)]
2479                 public static extern int setresuid (uint ruid, uint euid, uint suid);
2480
2481                 // setresgid(2)
2482                 //    int setresgid(gid_t ruid, gid_t euid, gid_t suid);
2483                 [DllImport (LIBC, SetLastError=true)]
2484                 public static extern int setresgid (uint rgid, uint egid, uint sgid);
2485
2486                 // fork(2)
2487                 //    pid_t fork(void);
2488                 [DllImport (LIBC, SetLastError=true)]
2489                 [Obsolete ("DO NOT directly call fork(2); it bypasses essential " +
2490                                 "shutdown code.\nUse System.Diagnostics.Process instead")]
2491                 public static extern int fork ();
2492
2493                 // vfork(2)
2494                 //    pid_t vfork(void);
2495                 [DllImport (LIBC, SetLastError=true)]
2496                 [Obsolete ("DO NOT directly call vfork(2); it bypasses essential " +
2497                                 "shutdown code.\nUse System.Diagnostics.Process instead")]
2498                 public static extern int vfork ();
2499
2500                 [DllImport (LIBC, SetLastError=true, EntryPoint="ttyname")]
2501                 private static extern IntPtr sys_ttyname (int fd);
2502
2503                 [Obsolete ("Not re-entrant.  Use ttyname_r instead.")]
2504                 public static string ttyname (int fd)
2505                 {
2506                         IntPtr r = sys_ttyname (fd);
2507                         return UnixMarshal.PtrToString (r);
2508                 }
2509
2510                 // ttyname_r(3)
2511                 //    int ttyname_r(int fd, char *buf, size_t buflen);
2512                 [DllImport (MPH, SetLastError=true,
2513                                 EntryPoint="Mono_Posix_Syscall_ttyname_r")]
2514                 public static extern int ttyname_r (int fd, [Out] StringBuilder buf, ulong buflen);
2515
2516                 public static int ttyname_r (int fd, StringBuilder buf)
2517                 {
2518                         return ttyname_r (fd, buf, (ulong) buf.Capacity);
2519                 }
2520
2521                 [DllImport (LIBC, EntryPoint="isatty")]
2522                 private static extern int sys_isatty (int fd);
2523
2524                 public static bool isatty (int fd)
2525                 {
2526                         return sys_isatty (fd) == 1;
2527                 }
2528
2529                 [DllImport (LIBC, SetLastError=true)]
2530                 public static extern int link (string oldpath, string newpath);
2531
2532                 [DllImport (LIBC, SetLastError=true)]
2533                 public static extern int symlink (string oldpath, string newpath);
2534
2535                 // readlink(2)
2536                 //    int readlink(const char *path, char *buf, size_t bufsize);
2537                 [DllImport (MPH, SetLastError=true,
2538                                 EntryPoint="Mono_Posix_Syscall_readlink")]
2539                 public static extern int readlink (string path, [Out] StringBuilder buf, ulong bufsiz);
2540
2541                 public static int readlink (string path, [Out] StringBuilder buf)
2542                 {
2543                         return readlink (path, buf, (ulong) buf.Capacity);
2544                 }
2545
2546                 [DllImport (LIBC, SetLastError=true)]
2547                 public static extern int unlink (string pathname);
2548
2549                 [DllImport (LIBC, SetLastError=true)]
2550                 public static extern int rmdir (string pathname);
2551
2552                 // tcgetpgrp(3)
2553                 //    pid_t tcgetpgrp(int fd);
2554                 [DllImport (LIBC, SetLastError=true)]
2555                 public static extern int tcgetpgrp (int fd);
2556
2557                 // tcsetpgrp(3)
2558                 //    int tcsetpgrp(int fd, pid_t pgrp);
2559                 [DllImport (LIBC, SetLastError=true)]
2560                 public static extern int tcsetpgrp (int fd, int pgrp);
2561
2562                 [DllImport (LIBC, SetLastError=true, EntryPoint="getlogin")]
2563                 private static extern IntPtr sys_getlogin ();
2564
2565                 [Obsolete ("Not re-entrant.  Use getlogin_r instead.")]
2566                 public static string getlogin ()
2567                 {
2568                         IntPtr r = sys_getlogin ();
2569                         return UnixMarshal.PtrToString (r);
2570                 }
2571
2572                 // getlogin_r(3)
2573                 //    int getlogin_r(char *buf, size_t bufsize);
2574                 [DllImport (MPH, SetLastError=true,
2575                                 EntryPoint="Mono_Posix_Syscall_getlogin_r")]
2576                 public static extern int getlogin_r ([Out] StringBuilder name, ulong bufsize);
2577
2578                 public static int getlogin_r (StringBuilder name)
2579                 {
2580                         return getlogin_r (name, (ulong) name.Capacity);
2581                 }
2582
2583                 [DllImport (LIBC, SetLastError=true)]
2584                 public static extern int setlogin (string name);
2585
2586                 // gethostname(2)
2587                 //    int gethostname(char *name, size_t len);
2588                 [DllImport (MPH, SetLastError=true,
2589                                 EntryPoint="Mono_Posix_Syscall_gethostname")]
2590                 public static extern int gethostname ([Out] StringBuilder name, ulong len);
2591
2592                 public static int gethostname (StringBuilder name)
2593                 {
2594                         return gethostname (name, (ulong) name.Capacity);
2595                 }
2596
2597                 // sethostname(2)
2598                 //    int gethostname(const char *name, size_t len);
2599                 [DllImport (MPH, SetLastError=true,
2600                                 EntryPoint="Mono_Posix_Syscall_gethostname")]
2601                 public static extern int sethostname (string name, ulong len);
2602
2603                 public static int sethostname (string name)
2604                 {
2605                         return sethostname (name, (ulong) name.Length);
2606                 }
2607
2608                 [DllImport (MPH, SetLastError=true,
2609                                 EntryPoint="Mono_Posix_Syscall_gethostid")]
2610                 public static extern long gethostid ();
2611
2612                 [DllImport (MPH, SetLastError=true,
2613                                 EntryPoint="Mono_Posix_Syscall_sethostid")]
2614                 public static extern int sethostid (long hostid);
2615
2616                 // getdomainname(2)
2617                 //    int getdomainname(char *name, size_t len);
2618                 [DllImport (MPH, SetLastError=true,
2619                                 EntryPoint="Mono_Posix_Syscall_getdomainname")]
2620                 public static extern int getdomainname ([Out] StringBuilder name, ulong len);
2621
2622                 public static int getdomainname (StringBuilder name)
2623                 {
2624                         return getdomainname (name, (ulong) name.Capacity);
2625                 }
2626
2627                 // setdomainname(2)
2628                 //    int setdomainname(const char *name, size_t len);
2629                 [DllImport (MPH, SetLastError=true,
2630                                 EntryPoint="Mono_Posix_Syscall_setdomainname")]
2631                 public static extern int setdomainname (string name, ulong len);
2632
2633                 public static int setdomainname (string name)
2634                 {
2635                         return setdomainname (name, (ulong) name.Length);
2636                 }
2637
2638                 [DllImport (LIBC, SetLastError=true)]
2639                 public static extern int vhangup ();
2640
2641                 // Revoke doesn't appear to be POSIX.  Include it?
2642                 [DllImport (LIBC, SetLastError=true)]
2643                 public static extern int revoke (string file);
2644
2645                 // TODO: profil?  It's not POSIX.
2646
2647                 [DllImport (LIBC, SetLastError=true)]
2648                 public static extern int acct (string filename);
2649
2650                 [DllImport (LIBC, SetLastError=true, EntryPoint="getusershell")]
2651                 private static extern IntPtr sys_getusershell ();
2652
2653                 public static string getusershell ()
2654                 {
2655                         IntPtr r = sys_getusershell ();
2656                         return UnixMarshal.PtrToString (r);
2657                 }
2658
2659                 [DllImport (LIBC, SetLastError=true)]
2660                 public static extern void setusershell ();
2661
2662                 [DllImport (LIBC, SetLastError=true)]
2663                 public static extern void endusershell ();
2664
2665                 [DllImport (LIBC, SetLastError=true)]
2666                 private static extern int daemon (int nochdir, int noclose);
2667
2668                 public static int daemon (bool nochdir, bool noclose)
2669                 {
2670                         return daemon (nochdir ? 1 : 0, noclose ? 1 : 0);
2671                 }
2672
2673                 [DllImport (LIBC, SetLastError=true)]
2674                 public static extern int chroot (string path);
2675
2676                 // skipping getpass(3) as the man page states:
2677                 //   This function is obsolete.  Do not use it.
2678
2679                 [DllImport (LIBC, SetLastError=true)]
2680                 public static extern int fsync (int fd);
2681
2682                 [DllImport (LIBC, SetLastError=true)]
2683                 public static extern int fdatasync (int fd);
2684
2685                 [DllImport (LIBC, SetLastError=true)]
2686                 public static extern void sync ();
2687
2688                 [DllImport (LIBC, SetLastError=true)]
2689                 [Obsolete ("Dropped in POSIX 1003.1-2001.  " +
2690                                 "Use Unistd.sysconf (SysConf._SC_PAGESIZE).")]
2691                 public static extern int getpagesize ();
2692
2693                 // truncate(2)
2694                 //    int truncate(const char *path, off_t length);
2695                 [DllImport (MPH, SetLastError=true,
2696                                 EntryPoint="Mono_Posix_Syscall_truncate")]
2697                 public static extern int truncate (string path, long length);
2698
2699                 // ftruncate(2)
2700                 //    int ftruncate(int fd, off_t length);
2701                 [DllImport (MPH, SetLastError=true,
2702                                 EntryPoint="Mono_Posix_Syscall_ftruncate")]
2703                 public static extern int ftruncate (int fd, long length);
2704
2705                 [DllImport (LIBC, SetLastError=true)]
2706                 public static extern int getdtablesize ();
2707
2708                 [DllImport (LIBC, SetLastError=true)]
2709                 public static extern int brk (IntPtr end_data_segment);
2710
2711                 [DllImport (LIBC, SetLastError=true)]
2712                 public static extern IntPtr sbrk (IntPtr increment);
2713
2714                 // TODO: syscall(2)?
2715                 // Probably safer to skip entirely.
2716
2717                 // lockf(3)
2718                 //    int lockf(int fd, int cmd, off_t len);
2719                 [DllImport (MPH, SetLastError=true,
2720                                 EntryPoint="Mono_Posix_Syscall_lockf")]
2721                 public static extern int lockf (int fd, LockFlags cmd, long len);
2722
2723                 [DllImport (CRYPT, SetLastError=true, EntryPoint="crypt")]
2724                 private static extern IntPtr sys_crypt (string key, string salt);
2725
2726                 public static string crypt (string key, string salt)
2727                 {
2728                         IntPtr r = sys_crypt (key, salt);
2729                         return UnixMarshal.PtrToString (r);
2730                 }
2731
2732                 [DllImport (CRYPT, SetLastError=true, EntryPoint="encrypt")]
2733                 private static extern void sys_encrypt ([In, Out] byte[] block, int edflag);
2734
2735                 public static void encrypt (byte[] block, bool decode)
2736                 {
2737                         if (block.Length < 64)
2738                                 throw new ArgumentOutOfRangeException ("block", "Must refer to at least 64 bytes");
2739                         sys_encrypt (block, decode ? 1 : 0);
2740                 }
2741
2742                 // swab(3)
2743                 //    void swab(const void *from, void *to, ssize_t n);
2744                 [DllImport (MPH, SetLastError=true,
2745                                 EntryPoint="Mono_Posix_Syscall_swab")]
2746                 public static extern void swab (IntPtr from, IntPtr to, long n);
2747
2748                 public static unsafe void swab (void* from, void* to, long n)
2749                 {
2750                         swab ((IntPtr) from, (IntPtr) to, n);
2751                 }
2752
2753                 #endregion
2754
2755                 #region <utime.h> Declarations
2756                 //
2757                 // <utime.h>  -- COMPLETE
2758                 //
2759
2760                 [DllImport (MPH, SetLastError=true,
2761                                 EntryPoint="Mono_Posix_Syscall_utime")]
2762                 public static extern int utime (string filename, ref Utimbuf buf);
2763
2764                 [DllImport (MPH, SetLastError=true,
2765                                 EntryPoint="Mono_Posix_Syscall_utime")]
2766                 private static extern int utime (string filename, IntPtr buf);
2767
2768                 public static int utime (string filename)
2769                 {
2770                         return utime (filename, IntPtr.Zero);
2771                 }
2772                 #endregion
2773         }
2774
2775         #endregion
2776 }
2777
2778 // vim: noexpandtab