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 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"},
  65         new string [] {"_GNU_SOURCE", "_XOPEN_SOURCE"})]
  66
  67 namespace Mono.Unix {
  68
  69         [Map]
  70         public enum Error : int {
  71                 // errors & their values liberally copied from
  72                 // FC2 /usr/include/asm/errno.h
  73
  74                 EPERM           =   1, // Operation not permitted
  75                 ENOENT          =   2, // No such file or directory
  76                 ESRCH           =   3, // No such process
  77                 EINTR           =   4, // Interrupted system call
  78                 EIO             =   5, // I/O error
  79                 ENXIO           =   6, // No such device or address
  80                 E2BIG           =   7, // Arg list too long
  81                 ENOEXEC         =   8, // Exec format error
  82                 EBADF           =   9, // Bad file number
  83                 ECHILD          =  10, // No child processes
  84                 EAGAIN          =  11, // Try again
  85                 ENOMEM          =  12, // Out of memory
  86                 EACCES          =  13, // Permission denied
  87                 EFAULT          =  14, // Bad address
  88                 ENOTBLK         =  15, // Block device required
  89                 EBUSY           =  16, // Device or resource busy
  90                 EEXIST          =  17, // File exists
  91                 EXDEV           =  18, // Cross-device link
  92                 ENODEV          =  19, // No such device
  93                 ENOTDIR         =  20, // Not a directory
  94                 EISDIR          =  21, // Is a directory
  95                 EINVAL          =  22, // Invalid argument
  96                 ENFILE          =  23, // File table overflow
  97                 EMFILE          =  24, // Too many open files
  98                 ENOTTY          =  25, // Not a typewriter
  99                 ETXTBSY         =  26, // Text file busy
 100                 EFBIG           =  27, // File too large
 101                 ENOSPC          =  28, // No space left on device
 102                 ESPIPE          =  29, // Illegal seek
 103                 EROFS           =  30, // Read-only file system
 104                 EMLINK          =  31, // Too many links
 105                 EPIPE           =  32, // Broken pipe
 106                 EDOM            =  33, // Math argument out of domain of func
 107                 ERANGE          =  34, // Math result not representable
 108                 EDEADLK         =  35, // Resource deadlock would occur
 109                 ENAMETOOLONG    =  36, // File name too long
 110                 ENOLCK          =  37, // No record locks available
 111                 ENOSYS          =  38, // Function not implemented
 112                 ENOTEMPTY       =  39, // Directory not empty
 113                 ELOOP           =  40, // Too many symbolic links encountered
 114                 EWOULDBLOCK     =  EAGAIN, // Operation would block
 115                 ENOMSG          =  42, // No message of desired type
 116                 EIDRM           =  43, // Identifier removed
 117                 ECHRNG          =  44, // Channel number out of range
 118                 EL2NSYNC        =  45, // Level 2 not synchronized
 119                 EL3HLT          =  46, // Level 3 halted
 120                 EL3RST          =  47, // Level 3 reset
 121                 ELNRNG          =  48, // Link number out of range
 122                 EUNATCH         =  49, // Protocol driver not attached
 123                 ENOCSI          =  50, // No CSI structure available
 124                 EL2HLT          =  51, // Level 2 halted
 125                 EBADE           =  52, // Invalid exchange
 126                 EBADR           =  53, // Invalid request descriptor
 127                 EXFULL          =  54, // Exchange full
 128                 ENOANO          =  55, // No anode
 129                 EBADRQC         =  56, // Invalid request code
 130                 EBADSLT         =  57, // Invalid slot
 131
 132                 EDEADLOCK             =  EDEADLK,
 133
 134                 EBFONT          =  59, // Bad font file format
 135                 ENOSTR          =  60, // Device not a stream
 136                 ENODATA         =  61, // No data available
 137                 ETIME           =  62, // Timer expired
 138                 ENOSR           =  63, // Out of streams resources
 139                 ENONET          =  64, // Machine is not on the network
 140                 ENOPKG          =  65, // Package not installed
 141                 EREMOTE         =  66, // Object is remote
 142                 ENOLINK         =  67, // Link has been severed
 143                 EADV            =  68, // Advertise error
 144                 ESRMNT          =  69, // Srmount error
 145                 ECOMM           =  70, // Communication error on send
 146                 EPROTO          =  71, // Protocol error
 147                 EMULTIHOP       =  72, // Multihop attempted
 148                 EDOTDOT         =  73, // RFS specific error
 149                 EBADMSG         =  74, // Not a data message
 150                 EOVERFLOW       =  75, // Value too large for defined data type
 151                 ENOTUNIQ        =  76, // Name not unique on network
 152                 EBADFD          =  77, // File descriptor in bad state
 153                 EREMCHG         =  78, // Remote address changed
 154                 ELIBACC         =  79, // Can not access a needed shared library
 155                 ELIBBAD         =  80, // Accessing a corrupted shared library
 156                 ELIBSCN         =  81, // .lib section in a.out corrupted
 157                 ELIBMAX         =  82, // Attempting to link in too many shared libraries
 158                 ELIBEXEC        =  83, // Cannot exec a shared library directly
 159                 EILSEQ          =  84, // Illegal byte sequence
 160                 ERESTART        =  85, // Interrupted system call should be restarted
 161                 ESTRPIPE        =  86, // Streams pipe error
 162                 EUSERS          =  87, // Too many users
 163                 ENOTSOCK        =  88, // Socket operation on non-socket
 164                 EDESTADDRREQ    =  89, // Destination address required
 165                 EMSGSIZE        =  90, // Message too long
 166                 EPROTOTYPE      =  91, // Protocol wrong type for socket
 167                 ENOPROTOOPT     =  92, // Protocol not available
 168                 EPROTONOSUPPORT =  93, // Protocol not supported
 169                 ESOCKTNOSUPPORT =  94, // Socket type not supported
 170                 EOPNOTSUPP      =  95, // Operation not supported on transport endpoint
 171                 EPFNOSUPPORT    =  96, // Protocol family not supported
 172                 EAFNOSUPPORT    =  97, // Address family not supported by protocol
 173                 EADDRINUSE      =  98, // Address already in use
 174                 EADDRNOTAVAIL   =  99, // Cannot assign requested address
 175                 ENETDOWN        = 100, // Network is down
 176                 ENETUNREACH     = 101, // Network is unreachable
 177                 ENETRESET       = 102, // Network dropped connection because of reset
 178                 ECONNABORTED    = 103, // Software caused connection abort
 179                 ECONNRESET      = 104, // Connection reset by peer
 180                 ENOBUFS         = 105, // No buffer space available
 181                 EISCONN         = 106, // Transport endpoint is already connected
 182                 ENOTCONN        = 107, // Transport endpoint is not connected
 183                 ESHUTDOWN       = 108, // Cannot send after transport endpoint shutdown
 184                 ETOOMANYREFS    = 109, // Too many references: cannot splice
 185                 ETIMEDOUT       = 110, // Connection timed out
 186                 ECONNREFUSED    = 111, // Connection refused
 187                 EHOSTDOWN       = 112, // Host is down
 188                 EHOSTUNREACH    = 113, // No route to host
 189                 EALREADY        = 114, // Operation already in progress
 190                 EINPROGRESS     = 115, // Operation now in progress
 191                 ESTALE          = 116, // Stale NFS file handle
 192                 EUCLEAN         = 117, // Structure needs cleaning
 193                 ENOTNAM         = 118, // Not a XENIX named type file
 194                 ENAVAIL         = 119, // No XENIX semaphores available
 195                 EISNAM          = 120, // Is a named type file
 196                 EREMOTEIO       = 121, // Remote I/O error
 197                 EDQUOT          = 122, // Quota exceeded
 198
 199                 ENOMEDIUM       = 123, // No medium found
 200                 EMEDIUMTYPE     = 124, // Wrong medium type
 201         }
 202
 203         [Map][Flags]
 204         public enum OpenFlags : int {
 205                 //
 206                 // One of these
 207                 //
 208                 O_RDONLY    = 0,
 209                 O_WRONLY    = 1,
 210                 O_RDWR      = 2,
 211
 212                 //
 213                 // Or-ed with zero or more of these
 214                 //
 215                 O_CREAT     = 4,
 216                 O_EXCL      = 8,
 217                 O_NOCTTY    = 16,
 218                 O_TRUNC     = 32,
 219                 O_APPEND    = 64,
 220                 O_NONBLOCK  = 128,
 221                 O_SYNC      = 256,
 222
 223                 //
 224                 // These are non-Posix.  Using them will result in errors/exceptions on
 225                 // non-supported platforms.
 226                 //
 227                 // (For example, "C-wrapped" system calls -- calls with implementation in
 228                 // MonoPosixHelper -- will return -1 with errno=EINVAL.  C#-wrapped system
 229                 // calls will generate an exception in UnixConvert, as the value can't be
 230                 // converted on the target platform.)
 231                 //
 232
 233                 O_NOFOLLOW  = 512,
 234                 O_DIRECTORY = 1024,
 235                 O_DIRECT    = 2048,
 236                 O_ASYNC     = 4096,
 237                 O_LARGEFILE = 8192
 238         }
 239
 240         // mode_t
 241         [Flags][Map]
 242         public enum FilePermissions : uint {
 243                 S_ISUID     = 0x0800, // Set user ID on execution
 244                 S_ISGID     = 0x0400, // Set gorup ID on execution
 245                 S_ISVTX     = 0x0200, // Save swapped text after use (sticky).
 246                 S_IRUSR     = 0x0100, // Read by owner
 247                 S_IWUSR     = 0x0080, // Write by owner
 248                 S_IXUSR     = 0x0040, // Execute by owner
 249                 S_IRGRP     = 0x0020, // Read by group
 250                 S_IWGRP     = 0x0010, // Write by group
 251                 S_IXGRP     = 0x0008, // Execute by group
 252                 S_IROTH     = 0x0004, // Read by other
 253                 S_IWOTH     = 0x0002, // Write by other
 254                 S_IXOTH     = 0x0001, // Execute by other
 255
 256                 S_IRWXG     = (S_IRGRP | S_IWGRP | S_IXGRP),
 257                 S_IRWXU     = (S_IRUSR | S_IWUSR | S_IXUSR),
 258                 S_IRWXO     = (S_IROTH | S_IWOTH | S_IXOTH),
 259                 ACCESSPERMS = (S_IRWXU | S_IRWXG | S_IRWXO), // 0777
 260                 ALLPERMS    = (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO), // 07777
 261                 DEFFILEMODE = (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH), // 0666
 262
 263                 // Device types
 264                 // Why these are held in "mode_t" is beyond me...
 265                 S_IFMT      = 0xF000, // Bits which determine file type
 266                 S_IFDIR     = 0x4000, // Directory
 267                 S_IFCHR     = 0x2000, // Character device
 268                 S_IFBLK     = 0x6000, // Block device
 269                 S_IFREG     = 0x8000, // Regular file
 270                 S_IFIFO     = 0x1000, // FIFO
 271                 S_IFLNK     = 0xA000, // Symbolic link
 272                 S_IFSOCK    = 0xC000, // Socket
 273         }
 274
 275         public struct Flock {
 276                 public LockType         l_type;    // Type of lock: F_RDLCK, F_WRLCK, F_UNLCK
 277                 public SeekFlags        l_whence;  // How to interpret l_start
 278                 public /* off_t */ long l_start;   // Starting offset for lock
 279                 public /* off_t */ long l_len;     // Number of bytes to lock
 280                 public /* pid_t */ int  l_pid;     // PID of process blocking our lock (F_GETLK only)
 281         }
 282
 283         [Map]
 284         public enum FcntlCommand : int {
 285                 // Form /usr/include/bits/fcntl.h
 286                 F_DUPFD    =    0, // Duplicate file descriptor.
 287                 F_GETFD    =    1, // Get file descriptor flags.
 288                 F_SETFD    =    2, // Set file descriptor flags.
 289                 F_GETFL    =    3, // Get file status flags.
 290                 F_SETFL    =    4, // Set file status flags.
 291                 F_GETLK    =   12, // Get record locking info. [64]
 292                 F_SETLK    =   13, // Set record locking info (non-blocking). [64]
 293                 F_SETLKW   =   14, // Set record locking info (blocking). [64]
 294                 F_SETOWN   =    8, // Set owner of socket (receiver of SIGIO).
 295                 F_GETOWN   =    9, // Get owner of socket (receiver of SIGIO).
 296                 F_SETSIG   =   10, // Set number of signal to be sent.
 297                 F_GETSIG   =   11, // Get number of signal to be sent.
 298                 F_SETLEASE = 1024, // Set a lease.
 299                 F_GETLEASE = 1025, // Enquire what lease is active.
 300                 F_NOTIFY   = 1026, // Required notifications on a directory
 301         }
 302
 303         [Map]
 304         public enum LockType : short {
 305                 F_RDLCK = 0, // Read lock.
 306                 F_WRLCK = 1, // Write lock.
 307                 F_UNLCK = 2, // Remove lock.
 308         }
 309
 310         [Map]
 311         public enum SeekFlags : short {
 312                 // values liberally copied from /usr/include/unistd.h
 313                 SEEK_SET = 0, // Seek from beginning of file.
 314                 SEEK_CUR = 1, // Seek from current position.
 315                 SEEK_END = 2, // Seek from end of file.
 316
 317                 L_SET    = SEEK_SET, // BSD alias for SEEK_SET
 318                 L_INCR   = SEEK_CUR, // BSD alias for SEEK_CUR
 319                 L_XTND   = SEEK_END, // BSD alias for SEEK_END
 320         }
 321
 322         [Map, Flags]
 323         public enum DirectoryNotifyFlags : int {
 324                 // from /usr/include/bits/fcntl.h
 325                 DN_ACCESS    = 0x00000001, // File accessed.
 326                 DN_MODIFY    = 0x00000002, // File modified.
 327                 DN_CREATE    = 0x00000004, // File created.
 328                 DN_DELETE    = 0x00000008, // File removed.
 329                 DN_RENAME    = 0x00000010, // File renamed.
 330                 DN_ATTRIB    = 0x00000020, // File changed attributes.
 331                 DN_MULTISHOT = unchecked ((int)0x80000000), // Don't remove notifier
 332         }
 333
 334         [Map]
 335         public enum PosixFadviseAdvice : int {
 336                 POSIX_FADV_NORMAL     = 0,  // No further special treatment.
 337                 POSIX_FADV_RANDOM     = 1,  // Expect random page references.
 338                 POSIX_FADV_SEQUENTIAL = 2,  // Expect sequential page references.
 339                 POSIX_FADV_WILLNEED   = 3,  // Will need these pages.
 340                 POSIX_FADV_DONTNEED   = 4,  // Don't need these pages.
 341                 POSIX_FADV_NOREUSE    = 5,  // Data will be accessed once.
 342         }
 343
 344         [Map]
 345         public enum PosixMadviseAdvice : int {
 346                 POSIX_MADV_NORMAL     = 0,  // No further special treatment.
 347                 POSIX_MADV_RANDOM     = 1,  // Expect random page references.
 348                 POSIX_MADV_SEQUENTIAL = 2,  // Expect sequential page references.
 349                 POSIX_MADV_WILLNEED   = 3,  // Will need these pages.
 350                 POSIX_MADV_DONTNEED   = 4,  // Don't need these pages.
 351         }
 352
 353         [Map]
 354         public enum Signum : int {
 355                 SIGHUP    =  1, // Hangup (POSIX).
 356                 SIGINT    =  2, // Interrupt (ANSI).
 357                 SIGQUIT   =  3, // Quit (POSIX).
 358                 SIGILL    =  4, // Illegal instruction (ANSI).
 359                 SIGTRAP   =  5, // Trace trap (POSIX).
 360                 SIGABRT   =  6, // Abort (ANSI).
 361                 SIGIOT    =  6, // IOT trap (4.2 BSD).
 362                 SIGBUS    =  7, // BUS error (4.2 BSD).
 363                 SIGFPE    =  8, // Floating-point exception (ANSI).
 364                 SIGKILL   =  9, // Kill, unblockable (POSIX).
 365                 SIGUSR1   = 10, // User-defined signal 1 (POSIX).
 366                 SIGSEGV   = 11, // Segmentation violation (ANSI).
 367                 SIGUSR2   = 12, // User-defined signal 2 (POSIX).
 368                 SIGPIPE   = 13, // Broken pipe (POSIX).
 369                 SIGALRM   = 14, // Alarm clock (POSIX).
 370                 SIGTERM   = 15, // Termination (ANSI).
 371                 SIGSTKFLT = 16, // Stack fault.
 372                 SIGCLD    = SIGCHLD, // Same as SIGCHLD (System V).
 373                 SIGCHLD   = 17, // Child status has changed (POSIX).
 374                 SIGCONT   = 18, // Continue (POSIX).
 375                 SIGSTOP   = 19, // Stop, unblockable (POSIX).
 376                 SIGTSTP   = 20, // Keyboard stop (POSIX).
 377                 SIGTTIN   = 21, // Background read from tty (POSIX).
 378                 SIGTTOU   = 22, // Background write to tty (POSIX).
 379                 SIGURG    = 23, // Urgent condition on socket (4.2 BSD).
 380                 SIGXCPU   = 24, // CPU limit exceeded (4.2 BSD).
 381                 SIGXFSZ   = 25, // File size limit exceeded (4.2 BSD).
 382                 SIGVTALRM = 26, // Virtual alarm clock (4.2 BSD).
 383                 SIGPROF   = 27, // Profiling alarm clock (4.2 BSD).
 384                 SIGWINCH  = 28, // Window size change (4.3 BSD, Sun).
 385                 SIGPOLL   = SIGIO, // Pollable event occurred (System V).
 386                 SIGIO     = 29, // I/O now possible (4.2 BSD).
 387                 SIGPWR    = 30, // Power failure restart (System V).
 388                 SIGSYS    = 31, // Bad system call.
 389                 SIGUNUSED = 31
 390         }
 391
 392         [Flags][Map]
 393         public enum WaitOptions : int {
 394                 WNOHANG   = 1,  // Don't block waiting
 395                 WUNTRACED = 2,  // Report status of stopped children
 396         }
 397
 398   [Flags][Map]
 399         public enum AccessMode : int {
 400                 R_OK = 1,
 401                 W_OK = 2,
 402                 X_OK = 4,
 403                 F_OK = 8,
 404         }
 405
 406         [Map]
 407         public enum PathConf : int {
 408                 _PC_LINK_MAX,
 409                 _PC_MAX_CANON,
 410                 _PC_MAX_INPUT,
 411                 _PC_NAME_MAX,
 412                 _PC_PATH_MAX,
 413                 _PC_PIPE_BUF,
 414                 _PC_CHOWN_RESTRICTED,
 415                 _PC_NO_TRUNC,
 416                 _PC_VDISABLE,
 417                 _PC_SYNC_IO,
 418                 _PC_ASYNC_IO,
 419                 _PC_PRIO_IO,
 420                 _PC_SOCK_MAXBUF,
 421                 _PC_FILESIZEBITS,
 422                 _PC_REC_INCR_XFER_SIZE,
 423                 _PC_REC_MAX_XFER_SIZE,
 424                 _PC_REC_MIN_XFER_SIZE,
 425                 _PC_REC_XFER_ALIGN,
 426                 _PC_ALLOC_SIZE_MIN,
 427                 _PC_SYMLINK_MAX,
 428                 _PC_2_SYMLINKS
 429         }
 430
 431         [Map]
 432         public enum SysConf : int {
 433                 _SC_ARG_MAX,
 434                 _SC_CHILD_MAX,
 435                 _SC_CLK_TCK,
 436                 _SC_NGROUPS_MAX,
 437                 _SC_OPEN_MAX,
 438                 _SC_STREAM_MAX,
 439                 _SC_TZNAME_MAX,
 440                 _SC_JOB_CONTROL,
 441                 _SC_SAVED_IDS,
 442                 _SC_REALTIME_SIGNALS,
 443                 _SC_PRIORITY_SCHEDULING,
 444                 _SC_TIMERS,
 445                 _SC_ASYNCHRONOUS_IO,
 446                 _SC_PRIORITIZED_IO,
 447                 _SC_SYNCHRONIZED_IO,
 448                 _SC_FSYNC,
 449                 _SC_MAPPED_FILES,
 450                 _SC_MEMLOCK,
 451                 _SC_MEMLOCK_RANGE,
 452                 _SC_MEMORY_PROTECTION,
 453                 _SC_MESSAGE_PASSING,
 454                 _SC_SEMAPHORES,
 455                 _SC_SHARED_MEMORY_OBJECTS,
 456                 _SC_AIO_LISTIO_MAX,
 457                 _SC_AIO_MAX,
 458                 _SC_AIO_PRIO_DELTA_MAX,
 459                 _SC_DELAYTIMER_MAX,
 460                 _SC_MQ_OPEN_MAX,
 461                 _SC_MQ_PRIO_MAX,
 462                 _SC_VERSION,
 463                 _SC_PAGESIZE,
 464                 _SC_RTSIG_MAX,
 465                 _SC_SEM_NSEMS_MAX,
 466                 _SC_SEM_VALUE_MAX,
 467                 _SC_SIGQUEUE_MAX,
 468                 _SC_TIMER_MAX,
 469                 /* Values for the argument to `sysconf'
 470                          corresponding to _POSIX2_* symbols.  */
 471                 _SC_BC_BASE_MAX,
 472                 _SC_BC_DIM_MAX,
 473                 _SC_BC_SCALE_MAX,
 474                 _SC_BC_STRING_MAX,
 475                 _SC_COLL_WEIGHTS_MAX,
 476                 _SC_EQUIV_CLASS_MAX,
 477                 _SC_EXPR_NEST_MAX,
 478                 _SC_LINE_MAX,
 479                 _SC_RE_DUP_MAX,
 480                 _SC_CHARCLASS_NAME_MAX,
 481                 _SC_2_VERSION,
 482                 _SC_2_C_BIND,
 483                 _SC_2_C_DEV,
 484                 _SC_2_FORT_DEV,
 485                 _SC_2_FORT_RUN,
 486                 _SC_2_SW_DEV,
 487                 _SC_2_LOCALEDEF,
 488                 _SC_PII,
 489                 _SC_PII_XTI,
 490                 _SC_PII_SOCKET,
 491                 _SC_PII_INTERNET,
 492                 _SC_PII_OSI,
 493                 _SC_POLL,
 494                 _SC_SELECT,
 495                 _SC_UIO_MAXIOV,
 496                 _SC_IOV_MAX = _SC_UIO_MAXIOV,
 497                 _SC_PII_INTERNET_STREAM,
 498                 _SC_PII_INTERNET_DGRAM,
 499                 _SC_PII_OSI_COTS,
 500                 _SC_PII_OSI_CLTS,
 501                 _SC_PII_OSI_M,
 502                 _SC_T_IOV_MAX,
 503                 /* Values according to POSIX 1003.1c (POSIX threads).  */
 504                 _SC_THREADS,
 505                 _SC_THREAD_SAFE_FUNCTIONS,
 506                 _SC_GETGR_R_SIZE_MAX,
 507                 _SC_GETPW_R_SIZE_MAX,
 508                 _SC_LOGIN_NAME_MAX,
 509                 _SC_TTY_NAME_MAX,
 510                 _SC_THREAD_DESTRUCTOR_ITERATIONS,
 511                 _SC_THREAD_KEYS_MAX,
 512                 _SC_THREAD_STACK_MIN,
 513                 _SC_THREAD_THREADS_MAX,
 514                 _SC_THREAD_ATTR_STACKADDR,
 515                 _SC_THREAD_ATTR_STACKSIZE,
 516                 _SC_THREAD_PRIORITY_SCHEDULING,
 517                 _SC_THREAD_PRIO_INHERIT,
 518                 _SC_THREAD_PRIO_PROTECT,
 519                 _SC_THREAD_PROCESS_SHARED,
 520                 _SC_NPROCESSORS_CONF,
 521                 _SC_NPROCESSORS_ONLN,
 522                 _SC_PHYS_PAGES,
 523                 _SC_AVPHYS_PAGES,
 524                 _SC_ATEXIT_MAX,
 525                 _SC_PASS_MAX,
 526                 _SC_XOPEN_VERSION,
 527                 _SC_XOPEN_XCU_VERSION,
 528                 _SC_XOPEN_UNIX,
 529                 _SC_XOPEN_CRYPT,
 530                 _SC_XOPEN_ENH_I18N,
 531                 _SC_XOPEN_SHM,
 532                 _SC_2_CHAR_TERM,
 533                 _SC_2_C_VERSION,
 534                 _SC_2_UPE,
 535                 _SC_XOPEN_XPG2,
 536                 _SC_XOPEN_XPG3,
 537                 _SC_XOPEN_XPG4,
 538                 _SC_CHAR_BIT,
 539                 _SC_CHAR_MAX,
 540                 _SC_CHAR_MIN,
 541                 _SC_INT_MAX,
 542                 _SC_INT_MIN,
 543                 _SC_LONG_BIT,
 544                 _SC_WORD_BIT,
 545                 _SC_MB_LEN_MAX,
 546                 _SC_NZERO,
 547                 _SC_SSIZE_MAX,
 548                 _SC_SCHAR_MAX,
 549                 _SC_SCHAR_MIN,
 550                 _SC_SHRT_MAX,
 551                 _SC_SHRT_MIN,
 552                 _SC_UCHAR_MAX,
 553                 _SC_UINT_MAX,
 554                 _SC_ULONG_MAX,
 555                 _SC_USHRT_MAX,
 556                 _SC_NL_ARGMAX,
 557                 _SC_NL_LANGMAX,
 558                 _SC_NL_MSGMAX,
 559                 _SC_NL_NMAX,
 560                 _SC_NL_SETMAX,
 561                 _SC_NL_TEXTMAX,
 562                 _SC_XBS5_ILP32_OFF32,
 563                 _SC_XBS5_ILP32_OFFBIG,
 564                 _SC_XBS5_LP64_OFF64,
 565                 _SC_XBS5_LPBIG_OFFBIG,
 566                 _SC_XOPEN_LEGACY,
 567                 _SC_XOPEN_REALTIME,
 568                 _SC_XOPEN_REALTIME_THREADS,
 569                 _SC_ADVISORY_INFO,
 570                 _SC_BARRIERS,
 571                 _SC_BASE,
 572                 _SC_C_LANG_SUPPORT,
 573                 _SC_C_LANG_SUPPORT_R,
 574                 _SC_CLOCK_SELECTION,
 575                 _SC_CPUTIME,
 576                 _SC_THREAD_CPUTIME,
 577                 _SC_DEVICE_IO,
 578                 _SC_DEVICE_SPECIFIC,
 579                 _SC_DEVICE_SPECIFIC_R,
 580                 _SC_FD_MGMT,
 581                 _SC_FIFO,
 582                 _SC_PIPE,
 583                 _SC_FILE_ATTRIBUTES,
 584                 _SC_FILE_LOCKING,
 585                 _SC_FILE_SYSTEM,
 586                 _SC_MONOTONIC_CLOCK,
 587                 _SC_MULTI_PROCESS,
 588                 _SC_SINGLE_PROCESS,
 589                 _SC_NETWORKING,
 590                 _SC_READER_WRITER_LOCKS,
 591                 _SC_SPIN_LOCKS,
 592                 _SC_REGEXP,
 593                 _SC_REGEX_VERSION,
 594                 _SC_SHELL,
 595                 _SC_SIGNALS,
 596                 _SC_SPAWN,
 597                 _SC_SPORADIC_SERVER,
 598                 _SC_THREAD_SPORADIC_SERVER,
 599                 _SC_SYSTEM_DATABASE,
 600                 _SC_SYSTEM_DATABASE_R,
 601                 _SC_TIMEOUTS,
 602                 _SC_TYPED_MEMORY_OBJECTS,
 603                 _SC_USER_GROUPS,
 604                 _SC_USER_GROUPS_R,
 605                 _SC_2_PBS,
 606                 _SC_2_PBS_ACCOUNTING,
 607                 _SC_2_PBS_LOCATE,
 608                 _SC_2_PBS_MESSAGE,
 609                 _SC_2_PBS_TRACK,
 610                 _SC_SYMLOOP_MAX,
 611                 _SC_STREAMS,
 612                 _SC_2_PBS_CHECKPOINT,
 613                 _SC_V6_ILP32_OFF32,
 614                 _SC_V6_ILP32_OFFBIG,
 615                 _SC_V6_LP64_OFF64,
 616                 _SC_V6_LPBIG_OFFBIG,
 617                 _SC_HOST_NAME_MAX,
 618                 _SC_TRACE,
 619                 _SC_TRACE_EVENT_FILTER,
 620                 _SC_TRACE_INHERIT,
 621                 _SC_TRACE_LOG,
 622                 _SC_LEVEL1_ICACHE_SIZE,
 623                 _SC_LEVEL1_ICACHE_ASSOC,
 624                 _SC_LEVEL1_ICACHE_LINESIZE,
 625                 _SC_LEVEL1_DCACHE_SIZE,
 626                 _SC_LEVEL1_DCACHE_ASSOC,
 627                 _SC_LEVEL1_DCACHE_LINESIZE,
 628                 _SC_LEVEL2_CACHE_SIZE,
 629                 _SC_LEVEL2_CACHE_ASSOC,
 630                 _SC_LEVEL2_CACHE_LINESIZE,
 631                 _SC_LEVEL3_CACHE_SIZE,
 632                 _SC_LEVEL3_CACHE_ASSOC,
 633                 _SC_LEVEL3_CACHE_LINESIZE,
 634                 _SC_LEVEL4_CACHE_SIZE,
 635                 _SC_LEVEL4_CACHE_ASSOC,
 636                 _SC_LEVEL4_CACHE_LINESIZE
 637         }
 638
 639         [Map]
 640         public enum ConfStr : int {
 641                 _CS_PATH,                       /* The default search path.  */
 642                 _CS_V6_WIDTH_RESTRICTED_ENVS,
 643                 _CS_GNU_LIBC_VERSION,
 644                 _CS_GNU_LIBPTHREAD_VERSION,
 645                 _CS_LFS_CFLAGS = 1000,
 646                 _CS_LFS_LDFLAGS,
 647                 _CS_LFS_LIBS,
 648                 _CS_LFS_LINTFLAGS,
 649                 _CS_LFS64_CFLAGS,
 650                 _CS_LFS64_LDFLAGS,
 651                 _CS_LFS64_LIBS,
 652                 _CS_LFS64_LINTFLAGS,
 653                 _CS_XBS5_ILP32_OFF32_CFLAGS = 1100,
 654                 _CS_XBS5_ILP32_OFF32_LDFLAGS,
 655                 _CS_XBS5_ILP32_OFF32_LIBS,
 656                 _CS_XBS5_ILP32_OFF32_LINTFLAGS,
 657                 _CS_XBS5_ILP32_OFFBIG_CFLAGS,
 658                 _CS_XBS5_ILP32_OFFBIG_LDFLAGS,
 659                 _CS_XBS5_ILP32_OFFBIG_LIBS,
 660                 _CS_XBS5_ILP32_OFFBIG_LINTFLAGS,
 661                 _CS_XBS5_LP64_OFF64_CFLAGS,
 662                 _CS_XBS5_LP64_OFF64_LDFLAGS,
 663                 _CS_XBS5_LP64_OFF64_LIBS,
 664                 _CS_XBS5_LP64_OFF64_LINTFLAGS,
 665                 _CS_XBS5_LPBIG_OFFBIG_CFLAGS,
 666                 _CS_XBS5_LPBIG_OFFBIG_LDFLAGS,
 667                 _CS_XBS5_LPBIG_OFFBIG_LIBS,
 668                 _CS_XBS5_LPBIG_OFFBIG_LINTFLAGS,
 669                 _CS_POSIX_V6_ILP32_OFF32_CFLAGS,
 670                 _CS_POSIX_V6_ILP32_OFF32_LDFLAGS,
 671                 _CS_POSIX_V6_ILP32_OFF32_LIBS,
 672                 _CS_POSIX_V6_ILP32_OFF32_LINTFLAGS,
 673                 _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS,
 674                 _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS,
 675                 _CS_POSIX_V6_ILP32_OFFBIG_LIBS,
 676                 _CS_POSIX_V6_ILP32_OFFBIG_LINTFLAGS,
 677                 _CS_POSIX_V6_LP64_OFF64_CFLAGS,
 678                 _CS_POSIX_V6_LP64_OFF64_LDFLAGS,
 679                 _CS_POSIX_V6_LP64_OFF64_LIBS,
 680                 _CS_POSIX_V6_LP64_OFF64_LINTFLAGS,
 681                 _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS,
 682                 _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS,
 683                 _CS_POSIX_V6_LPBIG_OFFBIG_LIBS,
 684                 _CS_POSIX_V6_LPBIG_OFFBIG_LINTFLAGS
 685         }
 686
 687         [Map]
 688         public enum LockFlags : int {
 689                 F_ULOCK = 0, // Unlock a previously locked region.
 690                 F_LOCK  = 1, // Lock a region for exclusive use.
 691                 F_TLOCK = 2, // Test and lock a region for exclusive use.
 692                 F_TEST  = 3, // Test a region for other process locks.
 693         }
 694
 695         [Map][Flags]
 696         public enum PollEvents : short {
 697                 POLLIN      = 0x0001, // There is data to read
 698                 POLLPRI     = 0x0002, // There is urgent data to read
 699                 POLLOUT     = 0x0004, // Writing now will not block
 700                 POLLERR     = 0x0008, // Error condition
 701                 POLLHUP     = 0x0010, // Hung up
 702                 POLLNVAL    = 0x0020, // Invalid request; fd not open
 703                 // XPG4.2 definitions (via _XOPEN_SOURCE)
 704                 POLLRDNORM  = 0x0040, // Normal data bay be read
 705                 POLLRDBAND  = 0x0080, // Priority data may be read
 706                 POLLWRNORM  = 0x0100, // Writing now will not block
 707                 POLLWRBAND  = 0x0200, // Priority data may be written
 708         }
 709
 710         [StructLayout(LayoutKind.Sequential)]
 711         public struct Pollfd {
 712                 public int fd;
 713                 public PollEvents events;
 714                 public PollEvents revents;
 715         }
 716
 717         public sealed class Dirent
 718         {
 719                 public /* ino_t */ ulong  d_ino;
 720                 public /* off_t */ long   d_off;
 721                 public ushort             d_reclen;
 722                 public byte               d_type;
 723                 public string             d_name;
 724
 725                 public override int GetHashCode ()
 726                 {
 727                         return d_ino.GetHashCode () ^ d_off.GetHashCode () ^
 728                                 d_reclen.GetHashCode () ^ d_type.GetHashCode () ^
 729                                 d_name.GetHashCode ();
 730                 }
 731
 732                 public override bool Equals (object obj)
 733                 {
 734                         if (obj == null || GetType() != obj.GetType())
 735                                 return false;
 736                         Dirent d = (Dirent) obj;
 737                         return d.d_ino == d_ino && d.d_off == d_off &&
 738                                 d.d_reclen == d_reclen && d.d_type == d_type &&
 739                                 d.d_name == d.d_name;
 740                 }
 741
 742                 public override string ToString ()
 743                 {
 744                         return d_name;
 745                 }
 746
 747                 public static bool operator== (Dirent lhs, Dirent rhs)
 748                 {
 749                         return Object.Equals (lhs, rhs);
 750                 }
 751
 752                 public static bool operator!= (Dirent lhs, Dirent rhs)
 753                 {
 754                         return Object.Equals (lhs, rhs);
 755                 }
 756         }
 757
 758         public sealed class Group
 759         {
 760                 public string           gr_name;
 761                 public string           gr_passwd;
 762                 public /* gid_t */ uint gr_gid;
 763                 public string[]         gr_mem;
 764
 765                 public override int GetHashCode ()
 766                 {
 767                         int memhc = 0;
 768                         for (int i = 0; i < gr_mem.Length; ++i)
 769                                 memhc ^= gr_mem[i].GetHashCode ();
 770
 771                         return gr_name.GetHashCode () ^ gr_passwd.GetHashCode () ^
 772                                 gr_gid.GetHashCode () ^ memhc;
 773                 }
 774
 775                 public override bool Equals (object obj)
 776                 {
 777                         if (obj == null || GetType() != obj.GetType())
 778                                 return false;
 779                         Group g = (Group) obj;
 780                         if (g.gr_gid != gr_gid)
 781                                 return false;
 782                         if (g.gr_gid == gr_gid && g.gr_name == g.gr_name &&
 783                                 g.gr_passwd == g.gr_passwd && g.gr_mem.Length == gr_mem.Length) {
 784                                 for (int i = 0; i < gr_mem.Length; ++i)
 785                                         if (gr_mem[i] != g.gr_mem[i])
 786                                                 return false;
 787                                 return true;
 788                         }
 789                         return false;
 790                 }
 791
 792                 // Generate string in /etc/group format
 793                 public override string ToString ()
 794                 {
 795                         StringBuilder sb = new StringBuilder ();
 796                         sb.AppendFormat ("{0}:{1}:{2}:", gr_name, gr_passwd, gr_gid);
 797                         GetMembers (sb, gr_mem);
 798                         return sb.ToString ();
 799                 }
 800
 801                 private static void GetMembers (StringBuilder sb, string[] members)
 802                 {
 803                         if (members.Length > 0)
 804                                 sb.Append (members[0]);
 805                         for (int i = 1; i < members.Length; ++i) {
 806                                 sb.Append (",");
 807                                 sb.Append (members[i]);
 808                         }
 809                 }
 810
 811                 public static bool operator== (Group lhs, Group rhs)
 812                 {
 813                         return Object.Equals (lhs, rhs);
 814                 }
 815
 816                 public static bool operator!= (Group lhs, Group rhs)
 817                 {
 818                         return Object.Equals (lhs, rhs);
 819                 }
 820         }
 821
 822         public sealed class Passwd
 823         {
 824                 public string           pw_name;
 825                 public string           pw_passwd;
 826                 public /* uid_t */ uint pw_uid;
 827                 public /* gid_t */ uint pw_gid;
 828                 public string           pw_gecos;
 829                 public string           pw_dir;
 830                 public string           pw_shell;
 831
 832                 public override int GetHashCode ()
 833                 {
 834                         return pw_name.GetHashCode () ^ pw_passwd.GetHashCode () ^
 835                                 pw_uid.GetHashCode () ^ pw_gid.GetHashCode () ^
 836                                 pw_gecos.GetHashCode () ^ pw_dir.GetHashCode () ^
 837                                 pw_dir.GetHashCode () ^ pw_shell.GetHashCode ();
 838                 }
 839
 840                 public override bool Equals (object obj)
 841                 {
 842                         if (obj == null || GetType() != obj.GetType())
 843                                 return false;
 844                         Passwd p = (Passwd) obj;
 845                         return p.pw_uid == pw_uid && p.pw_gid == pw_gid && p.pw_name == pw_name &&
 846                                 p.pw_passwd == pw_passwd && p.pw_gecos == p.pw_gecos &&
 847                                 p.pw_dir == p.pw_dir && p.pw_shell == p.pw_shell;
 848                 }
 849
 850                 // Generate string in /etc/passwd format
 851                 public override string ToString ()
 852                 {
 853                         return string.Format ("{0}:{1}:{2}:{3}:{4}:{5}:{6}",
 854                                 pw_name, pw_passwd, pw_uid, pw_gid, pw_gecos, pw_dir, pw_shell);
 855                 }
 856
 857                 public static bool operator== (Passwd lhs, Passwd rhs)
 858                 {
 859                         return Object.Equals (lhs, rhs);
 860                 }
 861
 862                 public static bool operator!= (Passwd lhs, Passwd rhs)
 863                 {
 864                         return Object.Equals (lhs, rhs);
 865                 }
 866         }
 867
 868         public struct Stat {
 869                 public  /* dev_t */     ulong   st_dev;     // device
 870                 public  /* ino_t */     ulong   st_ino;     // inode
 871                 public  FilePermissions         st_mode;    // protection
 872                 private uint                    _padding_;  // padding for structure alignment
 873                 public  /* nlink_t */   ulong   st_nlink;   // number of hard links
 874                 public  /* uid_t */     uint    st_uid;     // user ID of owner
 875                 public  /* gid_t */     uint    st_gid;     // group ID of owner
 876                 public  /* dev_t */     ulong   st_rdev;    // device type (if inode device)
 877                 public  /* off_t */     long    st_size;    // total size, in bytes
 878                 public  /* blksize_t */ long    st_blksize; // blocksize for filesystem I/O
 879                 public  /* blkcnt_t */  long    st_blocks;  // number of blocks allocated
 880                 public  /* time_t */    long    st_atime;   // time of last access
 881                 public  /* time_t */    long    st_mtime;   // time of last modification
 882                 public  /* time_t */    long    st_ctime;   // time of last status change
 883         }
 884
 885         public struct Timeval {
 886                 public  /* time_t */      long    tv_sec;   // seconds
 887                 public  /* suseconds_t */ long    tv_usec;  // microseconds
 888         }
 889
 890         public struct Timezone {
 891                 public  int tz_minuteswest; // minutes W of Greenwich
 892                 private int tz_dsttime;     // type of dst correction (OBSOLETE)
 893         }
 894
 895         public struct Utimbuf {
 896                 public  /* time_t */      long    actime;   // access time
 897                 public  /* time_t */      long    modtime;  // modification time
 898         }
 899
 900         //
 901         // Convention: Functions *not* part of the standard C library AND part of
 902         // a POSIX and/or Unix standard (X/Open, SUS, XPG, etc.) go here.
 903         //
 904         // For example, the man page should be similar to:
 905         //
 906         //    CONFORMING TO (or CONFORMS TO)
 907         //           XPG2, SUSv2, POSIX, etc.
 908         //
 909         // BSD- and GNU-specific exports can also be placed here.
 910         //
 911         // The only methods in here should be:
 912         //  (1) low-level functions
 913         //  (2) "Trivial" function overloads.  For example, if the parameters to a
 914         //      function are related (e.g. getgroups(2))
 915         //  (3) The return type SHOULD NOT be changed.  If you want to provide a
 916         //      convenience function with a nicer return type, place it into one of
 917         //      the Unix* wrapper classes, and give it a .NET-styled name.
 918         //  (4) Exceptions SHOULD NOT be thrown.  EXCEPTIONS:
 919         //      - If you're wrapping *broken* methods which make assumptions about
 920         //        input data, such as that an argument refers to N bytes of data.
 921         //        This is currently limited to cuserid(3) and encrypt(3).
 922         //      - If you call functions which themselves generate exceptions.
 923         //        This is the case for using UnixConvert, which will throw an
 924         //        exception if an invalid/unsupported value is used.
 925         //
 926         public sealed class Syscall : Stdlib
 927         {
 928                 private const string LIBC = "libc";
 929                 private const string MPH = "MonoPosixHelper";
 930                 private const string CRYPT = "crypt";
 931
 932                 private Syscall () {}
 933
 934                 //
 935                 // <aio.h>
 936                 //
 937
 938                 // TODO: aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3),
 939                 // aio_return(3), aio_suspend(3), aio_write(3)
 940                 //
 941                 // Then update UnixStream.BeginRead to use the aio* functions.
 942
 943                 #region <dirent.h> Declarations
 944                 //
 945                 // <dirent.h>
 946                 //
 947                 // TODO: scandir(3), alphasort(3), versionsort(3), getdirentries(3)
 948
 949                 [DllImport (LIBC, SetLastError=true)]
 950                 public static extern IntPtr opendir (string name);
 951
 952                 [DllImport (LIBC, SetLastError=true)]
 953                 public static extern int closedir (IntPtr dir);
 954
 955                 // seekdir(3):
 956                 //    void seekdir (DIR *dir, off_t offset);
 957                 //    Slight modification.  Returns -1 on error, 0 on success.
 958                 [DllImport (MPH, SetLastError=true,
 959                                 EntryPoint="Mono_Posix_Syscall_seekdir")]
 960                 public static extern int seekdir (IntPtr dir, long offset);
 961
 962                 // telldir(3)
 963                 //    off_t telldir(DIR *dir);
 964                 [DllImport (MPH, SetLastError=true,
 965                                 EntryPoint="Mono_Posix_Syscall_telldir")]
 966                 public static extern long telldir (IntPtr dir);
 967
 968                 [DllImport (LIBC, SetLastError=true)]
 969                 public static extern void rewinddir (IntPtr dir);
 970
 971                 private struct _Dirent {
 972                         public /* ino_t */ ulong  d_ino;
 973                         public /* off_t */ long   d_off;
 974                         public ushort             d_reclen;
 975                         public byte               d_type;
 976                         public IntPtr             d_name;
 977                 }
 978
 979                 private static void CopyDirent (Dirent to, ref _Dirent from)
 980                 {
 981                         try {
 982                                 to.d_ino    = from.d_ino;
 983                                 to.d_off    = from.d_off;
 984                                 to.d_reclen = from.d_reclen;
 985                                 to.d_type   = from.d_type;
 986                                 if (from.d_name != IntPtr.Zero)
 987                                         to.d_name = UnixMarshal.PtrToString (from.d_name);
 988                                 else
 989                                         to.d_name = null;
 990                         }
 991                         finally {
 992                                 Stdlib.free (from.d_name);
 993                                 from.d_name = IntPtr.Zero;
 994                         }
 995                 }
 996
 997                 [DllImport (MPH, SetLastError=true,
 998                                 EntryPoint="Mono_Posix_Syscall_readdir")]
 999                 private static extern int sys_readdir (IntPtr dir, out _Dirent dentry);
1000
1001                 public static Dirent readdir (IntPtr dir)
1002                 {
1003                         _Dirent dentry;
1004                         int r = sys_readdir (dir, out dentry);
1005                         if (r != 0)
1006                                 return null;
1007                         Dirent d = new Dirent ();
1008                         CopyDirent (d, ref dentry);
1009                         return d;
1010                 }
1011
1012                 [DllImport (MPH, SetLastError=true,
1013                                 EntryPoint="Mono_Posix_Syscall_readdir_r")]
1014                 private static extern int sys_readdir_r (IntPtr dirp, out _Dirent entry, out IntPtr result);
1015
1016                 public static int readdir_r (IntPtr dirp, Dirent entry, out IntPtr result)
1017                 {
1018                         entry.d_ino    = 0;
1019                         entry.d_off    = 0;
1020                         entry.d_reclen = 0;
1021                         entry.d_type   = 0;
1022                         entry.d_name   = null;
1023
1024                         _Dirent _d;
1025                         int r = sys_readdir_r (dirp, out _d, out result);
1026
1027                         if (r == 0 && result != IntPtr.Zero) {
1028                                 CopyDirent (entry, ref _d);
1029                         }
1030
1031                         return r;
1032                 }
1033
1034                 [DllImport (LIBC, SetLastError=true)]
1035                 public static extern int dirfd (IntPtr dir);
1036                 #endregion
1037
1038                 #region <errno.h> Declarations
1039                 //
1040                 // <errno.h>  -- COMPLETE
1041                 //
1042
1043                 public static Error GetLastError ()
1044                 {
1045                         int errno = Marshal.GetLastWin32Error ();
1046                         return UnixConvert.ToError (errno);
1047                 }
1048
1049                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_SetLastError")]
1050                 private static extern void SetLastError (int error);
1051
1052                 public static void SetLastError (Error error)
1053                 {
1054                         int _error = UnixConvert.FromError (error);
1055                         SetLastError (_error);
1056                 }
1057                 #endregion
1058
1059                 #region <fcntl.h> Declarations
1060                 //
1061                 // <fcntl.h> -- COMPLETE
1062                 //
1063
1064                 [DllImport (MPH, SetLastError=true,
1065                                 EntryPoint="Mono_Posix_Syscall_fcntl")]
1066                 public static extern int fcntl (int fd, FcntlCommand cmd);
1067
1068                 [DllImport (MPH, SetLastError=true,
1069                                 EntryPoint="Mono_Posix_Syscall_fcntl_arg")]
1070                 public static extern int fcntl (int fd, FcntlCommand cmd, long arg);
1071
1072                 [DllImport (MPH, SetLastError=true,
1073                                 EntryPoint="Mono_Posix_Syscall_fcntl_lock")]
1074                 public static extern int fcntl (int fd, FcntlCommand cmd, ref Flock @lock);
1075
1076                 [DllImport (MPH, SetLastError=true,
1077                                 EntryPoint="Mono_Posix_Syscall_open")]
1078                 public static extern int open (string pathname, OpenFlags flags);
1079
1080                 // open(2)
1081                 //    int open(const char *pathname, int flags, mode_t mode);
1082                 [DllImport (MPH, SetLastError=true,
1083                                 EntryPoint="Mono_Posix_Syscall_open_mode")]
1084                 public static extern int open (string pathname, OpenFlags flags, FilePermissions mode);
1085
1086                 // creat(2)
1087                 //    int creat(const char *pathname, mode_t mode);
1088                 [DllImport (MPH, SetLastError=true,
1089                                 EntryPoint="Mono_Posix_Syscall_creat")]
1090                 public static extern int creat (string pathname, FilePermissions mode);
1091
1092                 // posix_fadvise(2)
1093                 //    int posix_fadvise(int fd, off_t offset, off_t len, int advice);
1094                 [DllImport (MPH, SetLastError=true,
1095                                 EntryPoint="Mono_Posix_Syscall_posix_fadvise")]
1096                 public static extern int posix_fadvise (int fd, long offset,
1097                         long len, PosixFadviseAdvice advice);
1098
1099                 // posix_fallocate(P)
1100                 //    int posix_fallocate(int fd, off_t offset, size_t len);
1101                 [DllImport (MPH, SetLastError=true,
1102                                 EntryPoint="Mono_Posix_Syscall_posix_fallocate")]
1103                 public static extern int posix_fallocate (int fd, long offset, long len);
1104                 #endregion
1105
1106                 #region <grp.h> Declarations
1107                 //
1108                 // <grp.h>
1109                 //
1110                 // TODO: putgrent(3), fgetgrent_r(), getgrouplist(2), initgroups(3)
1111
1112                 // setgroups(2)
1113                 //    int setgroups (size_t size, const gid_t *list);
1114                 [DllImport (MPH, SetLastError=true,
1115                                 EntryPoint="Mono_Posix_Syscall_setgroups")]
1116                 public static extern int setgroups (ulong size, uint[] list);
1117
1118                 public static int setgroups (uint [] list)
1119                 {
1120                         return setgroups ((ulong) list.Length, list);
1121                 }
1122
1123                 private struct _Group
1124                 {
1125                         public IntPtr           gr_name;
1126                         public IntPtr           gr_passwd;
1127                         public /* gid_t */ uint gr_gid;
1128                         public int              _gr_nmem_;
1129                         public IntPtr           gr_mem;
1130                         public IntPtr           _gr_buf_;
1131                 }
1132
1133                 private static void CopyGroup (Group to, ref _Group from)
1134                 {
1135                         try {
1136                                 to.gr_gid    = from.gr_gid;
1137                                 to.gr_name   = UnixMarshal.PtrToString (from.gr_name);
1138                                 to.gr_passwd = UnixMarshal.PtrToString (from.gr_passwd);
1139                                 to.gr_mem    = UnixMarshal.PtrToStringArray (from._gr_nmem_, from.gr_mem);
1140                         }
1141                         finally {
1142                                 Stdlib.free (from.gr_mem);
1143                                 Stdlib.free (from._gr_buf_);
1144                                 from.gr_mem   = IntPtr.Zero;
1145                                 from._gr_buf_ = IntPtr.Zero;
1146                         }
1147                 }
1148
1149                 [DllImport (MPH, SetLastError=true,
1150                                 EntryPoint="Mono_Posix_Syscall_getgrnam")]
1151                 private static extern int sys_getgrnam (string name, out _Group group);
1152
1153                 public static Group getgrnam (string name)
1154                 {
1155                         _Group group;
1156                         int r = sys_getgrnam (name, out group);
1157                         if (r != 0)
1158                                 return null;
1159                         Group gr = new Group ();
1160                         CopyGroup (gr, ref group);
1161                         return gr;
1162                 }
1163
1164                 // getgrgid(3)
1165                 //    struct group *getgrgid(gid_t gid);
1166                 [DllImport (MPH, SetLastError=true,
1167                                 EntryPoint="Mono_Posix_Syscall_getgrgid")]
1168                 private static extern int sys_getgrgid (uint uid, out _Group group);
1169
1170                 public static Group getgrgid (uint uid)
1171                 {
1172                         _Group group;
1173                         int r = sys_getgrgid (uid, out group);
1174                         if (r != 0)
1175                                 return null;
1176                         Group gr = new Group ();
1177                         CopyGroup (gr, ref group);
1178                         return gr;
1179                 }
1180
1181                 [DllImport (MPH, SetLastError=true,
1182                                 EntryPoint="Mono_Posix_Syscall_getgrnam_r")]
1183                 private static extern int sys_getgrnam_r (string name, out _Group grbuf, out IntPtr grbufp);
1184
1185                 public static int getgrnam_r (string name, Group grbuf, out Group grbufp)
1186                 {
1187                         grbufp = null;
1188                         _Group group;
1189                         IntPtr _grbufp;
1190                         int r = sys_getgrnam_r (name, out group, out _grbufp);
1191                         if (r == 0 && _grbufp != IntPtr.Zero) {
1192                                 CopyGroup (grbuf, ref group);
1193                                 grbufp = grbuf;
1194                         }
1195                         return r;
1196                 }
1197
1198                 // getgrgid_r(3)
1199                 //    int getgrgid_r(gid_t gid, struct group *gbuf, char *buf,
1200                 //        size_t buflen, struct group **gbufp);
1201                 [DllImport (MPH, SetLastError=true,
1202                                 EntryPoint="Mono_Posix_Syscall_getgrgid_r")]
1203                 private static extern int sys_getgrgid_r (uint uid, out _Group grbuf, out IntPtr grbufp);
1204
1205                 public static int getgrgid_r (uint uid, Group grbuf, out Group grbufp)
1206                 {
1207                         grbufp = null;
1208                         _Group group;
1209                         IntPtr _grbufp;
1210                         int r = sys_getgrgid_r (uid, out group, out _grbufp);
1211                         if (r == 0 && _grbufp != IntPtr.Zero) {
1212                                 CopyGroup (grbuf, ref group);
1213                                 grbufp = grbuf;
1214                         }
1215                         return r;
1216                 }
1217
1218                 [DllImport (MPH, SetLastError=true,
1219                                 EntryPoint="Mono_Posix_Syscall_getgrent")]
1220                 private static extern int sys_getgrent (out _Group grbuf);
1221
1222                 public static Group getgrent ()
1223                 {
1224                         _Group group;
1225                         int r = sys_getgrent (out group);
1226                         if (r != 0)
1227                                 return null;
1228                         Group gr = new Group();
1229                         CopyGroup (gr, ref group);
1230                         return gr;
1231                 }
1232
1233                 [DllImport (LIBC, SetLastError=true)]
1234                 public static extern void setgrent ();
1235
1236                 [DllImport (LIBC, SetLastError=true)]
1237                 public static extern void endgrent ();
1238
1239                 [DllImport (MPH, SetLastError=true,
1240                                 EntryPoint="Mono_Posix_Syscall_fgetgrent")]
1241                 private static extern int sys_fgetgrent (IntPtr stream, out _Group grbuf);
1242
1243                 public static Group fgetgrent (IntPtr stream)
1244                 {
1245                         _Group group;
1246                         int r = sys_fgetgrent (stream, out group);
1247                         if (r != 0)
1248                                 return null;
1249                         Group gr = new Group ();
1250                         CopyGroup (gr, ref group);
1251                         return gr;
1252                 }
1253                 #endregion
1254
1255                 #region <pwd.h> Declarations
1256                 //
1257                 // <pwd.h>
1258                 //
1259                 // TODO: putpwent(3), fgetpwent_r()
1260                 //
1261                 // SKIPPING: getpw(3): it's dangerous.  Use getpwuid(3) instead.
1262
1263                 private struct _Passwd
1264                 {
1265                         public IntPtr           pw_name;
1266                         public IntPtr           pw_passwd;
1267                         public /* uid_t */ uint pw_uid;
1268                         public /* gid_t */ uint pw_gid;
1269                         public IntPtr           pw_gecos;
1270                         public IntPtr           pw_dir;
1271                         public IntPtr           pw_shell;
1272                         public IntPtr           _pw_buf_;
1273                 }
1274
1275                 private static void CopyPasswd (Passwd to, ref _Passwd from)
1276                 {
1277                         try {
1278                                 to.pw_name   = UnixMarshal.PtrToString (from.pw_name);
1279                                 to.pw_passwd = UnixMarshal.PtrToString (from.pw_passwd);
1280                                 to.pw_uid    = from.pw_uid;
1281                                 to.pw_gid    = from.pw_gid;
1282                                 to.pw_gecos  = UnixMarshal.PtrToString (from.pw_gecos);
1283                                 to.pw_dir    = UnixMarshal.PtrToString (from.pw_dir);
1284                                 to.pw_shell  = UnixMarshal.PtrToString (from.pw_shell);
1285                         }
1286                         finally {
1287                                 Stdlib.free (from._pw_buf_);
1288                                 from._pw_buf_ = IntPtr.Zero;
1289                         }
1290                 }
1291
1292                 [DllImport (MPH, SetLastError=true,
1293                                 EntryPoint="Mono_Posix_Syscall_getpwnam")]
1294                 private static extern int sys_getpwnam (string name, out _Passwd passwd);
1295
1296                 public static Passwd getpwnam (string name)
1297                 {
1298                         _Passwd passwd;
1299                         int r = sys_getpwnam (name, out passwd);
1300                         if (r != 0)
1301                                 return null;
1302                         Passwd pw = new Passwd ();
1303                         CopyPasswd (pw, ref passwd);
1304                         return pw;
1305                 }
1306
1307                 // getpwuid(3)
1308                 //    struct passwd *getpwnuid(uid_t uid);
1309                 [DllImport (MPH, SetLastError=true,
1310                                 EntryPoint="Mono_Posix_Syscall_getpwuid")]
1311                 private static extern int sys_getpwuid (uint uid, out _Passwd passwd);
1312
1313                 public static Passwd getpwuid (uint uid)
1314                 {
1315                         _Passwd passwd;
1316                         int r = sys_getpwuid (uid, out passwd);
1317                         if (r != 0)
1318                                 return null;
1319                         Passwd pw = new Passwd ();
1320                         CopyPasswd (pw, ref passwd);
1321                         return pw;
1322                 }
1323
1324                 [DllImport (MPH, SetLastError=true,
1325                                 EntryPoint="Mono_Posix_Syscall_getpwnam_r")]
1326                 private static extern int sys_getpwnam_r (string name, out _Passwd pwbuf, out IntPtr pwbufp);
1327
1328                 public static int getpwnam_r (string name, Passwd pwbuf, out Passwd pwbufp)
1329                 {
1330                         pwbufp = null;
1331                         _Passwd passwd;
1332                         IntPtr _pwbufp;
1333                         int r = sys_getpwnam_r (name, out passwd, out _pwbufp);
1334                         if (r == 0 && _pwbufp != IntPtr.Zero) {
1335                                 CopyPasswd (pwbuf, ref passwd);
1336                                 pwbufp = pwbuf;
1337                         }
1338                         return r;
1339                 }
1340
1341                 // getpwuid_r(3)
1342                 //    int getpwuid_r(uid_t uid, struct passwd *pwbuf, char *buf, size_t
1343                 //        buflen, struct passwd **pwbufp);
1344                 [DllImport (MPH, SetLastError=true,
1345                                 EntryPoint="Mono_Posix_Syscall_getpwuid_r")]
1346                 private static extern int sys_getpwuid_r (uint uid, out _Passwd pwbuf, out IntPtr pwbufp);
1347
1348                 public static int getpwuid_r (uint uid, Passwd pwbuf, out Passwd pwbufp)
1349                 {
1350                         pwbufp = null;
1351                         _Passwd passwd;
1352                         IntPtr _pwbufp;
1353                         int r = sys_getpwuid_r (uid, out passwd, out _pwbufp);
1354                         if (r == 0 && _pwbufp != IntPtr.Zero) {
1355                                 CopyPasswd (pwbuf, ref passwd);
1356                                 pwbufp = pwbuf;
1357                         }
1358                         return r;
1359                 }
1360
1361                 [DllImport (MPH, SetLastError=true,
1362                                 EntryPoint="Mono_Posix_Syscall_getpwent")]
1363                 private static extern int sys_getpwent (out _Passwd pwbuf);
1364
1365                 public static Passwd getpwent ()
1366                 {
1367                         _Passwd passwd;
1368                         int r = sys_getpwent (out passwd);
1369                         if (r != 0)
1370                                 return null;
1371                         Passwd pw = new Passwd ();
1372                         CopyPasswd (pw, ref passwd);
1373                         return pw;
1374                 }
1375
1376                 [DllImport (LIBC, SetLastError=true)]
1377                 public static extern void setpwent ();
1378
1379                 [DllImport (LIBC, SetLastError=true)]
1380                 public static extern void endpwent ();
1381
1382                 [DllImport (MPH, SetLastError=true,
1383                                 EntryPoint="Mono_Posix_Syscall_fgetpwent")]
1384                 private static extern int sys_fgetpwent (IntPtr stream, out _Passwd pwbuf);
1385
1386                 public static Passwd fgetpwent (IntPtr stream)
1387                 {
1388                         _Passwd passwd;
1389                         int r = sys_fgetpwent (stream, out passwd);
1390                         if (r != 0)
1391                                 return null;
1392                         Passwd pw = new Passwd ();
1393                         CopyPasswd (pw, ref passwd);
1394                         return pw;
1395                 }
1396                 #endregion
1397
1398                 #region <signal.h> Declarations
1399                 //
1400                 // <signal.h>
1401                 //
1402                 [DllImport (LIBC, SetLastError=true)]
1403                 private static extern void psignal (int sig, string s);
1404
1405                 public static void psignal (Signum sig, string s)
1406                 {
1407                         int signum = UnixConvert.FromSignum (sig);
1408                         psignal (signum, s);
1409                 }
1410
1411                 // kill(2)
1412                 //    int kill(pid_t pid, int sig);
1413                 [DllImport (LIBC, SetLastError=true, EntryPoint="kill")]
1414                 private static extern int sys_kill (int pid, int sig);
1415
1416                 public static int kill (int pid, Signum sig)
1417                 {
1418                         int _sig = UnixConvert.FromSignum (sig);
1419                         return sys_kill (pid, _sig);
1420                 }
1421
1422                 [DllImport (LIBC, SetLastError=true, EntryPoint="strsignal")]
1423                 private static extern IntPtr sys_strsignal (int sig);
1424
1425                 public static IntPtr sys_strsignal (Signum sig)
1426                 {
1427                         int s = UnixConvert.FromSignum (sig);
1428                         return sys_strsignal (s);
1429                 }
1430
1431                 public static string strsignal (Signum sig)
1432                 {
1433                         IntPtr r = sys_strsignal (sig);
1434                         return UnixMarshal.PtrToString (r);
1435                 }
1436
1437                 // TODO: sigaction(2)
1438                 // TODO: sigsuspend(2)
1439                 // TODO: sigpending(2)
1440
1441                 #endregion
1442
1443                 #region <stdio.h> Declarations
1444                 //
1445                 // <stdio.h>
1446                 //
1447                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_L_ctermid")]
1448                 private static extern int _L_ctermid ();
1449
1450                 public static readonly int L_ctermid = _L_ctermid ();
1451
1452                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_L_cuserid")]
1453                 private static extern int _L_cuserid ();
1454
1455                 public static readonly int L_cuserid = _L_cuserid ();
1456
1457                 [DllImport (LIBC, SetLastError=true, EntryPoint="cuserid")]
1458                 private static extern IntPtr sys_cuserid ([Out] StringBuilder @string);
1459
1460                 [Obsolete ("\"Nobody knows precisely what cuserid() does... DO NOT USE cuserid()." +
1461                                 "`string' must hold L_cuserid characters.  Use Unistd.getlogin_r instead.")]
1462                 public static string cuserid (StringBuilder @string)
1463                 {
1464                         if (@string.Capacity < L_cuserid) {
1465                                 throw new ArgumentOutOfRangeException ("string", "string.Capacity < L_cuserid");
1466                         }
1467                         IntPtr r = sys_cuserid (@string);
1468                         return UnixMarshal.PtrToString (r);
1469                 }
1470
1471                 #endregion
1472
1473                 #region <stdlib.h> Declarations
1474                 //
1475                 // <stdlib.h>
1476                 //
1477                 [DllImport (LIBC, SetLastError=true)]
1478                 public static extern int ttyslot ();
1479
1480                 [DllImport (CRYPT, SetLastError=true)]
1481                 public static extern void setkey (string key);
1482
1483                 #endregion
1484
1485                 #region <string.h> Declarations
1486                 //
1487                 // <string.h>
1488                 //
1489
1490                 // strerror_r(3)
1491                 //    int strerror_r(int errnum, char *buf, size_t n);
1492                 [DllImport (LIBC, SetLastError=true,
1493                                 EntryPoint="Mono_Posix_Syscall_strerror_r")]
1494                 private static extern int sys_strerror_r (int errnum,
1495                                 [Out] StringBuilder buf, ulong n);
1496
1497                 public static int strerror_r (Error errnum, StringBuilder buf, ulong n)
1498                 {
1499                         int e = UnixConvert.FromError (errnum);
1500                         return sys_strerror_r (e, buf, n);
1501                 }
1502
1503                 public static int strerror_r (Error errnum, StringBuilder buf)
1504                 {
1505                         return strerror_r (errnum, buf, (ulong) buf.Capacity);
1506                 }
1507
1508                 #endregion
1509
1510                 #region <sys/mman.h> Declarations
1511                 //
1512                 // <sys/mman.h>
1513                 //
1514
1515                 // posix_madvise(P)
1516                 //    int posix_madvise(void *addr, size_t len, int advice);
1517                 [DllImport (MPH, SetLastError=true,
1518                                 EntryPoint="Mono_Posix_Syscall_posix_madvise")]
1519                 public static extern int posix_madvise (IntPtr addr, ulong len,
1520                         PosixMadviseAdvice advice);
1521
1522                 #endregion
1523
1524                 #region <sys/poll.h> Declarations
1525                 //
1526                 // <sys/poll.h> -- COMPLETE
1527                 //
1528
1529                 private struct _pollfd {
1530                         public int fd;
1531                         public short events;
1532                         public short revents;
1533                 }
1534
1535                 [DllImport (LIBC, SetLastError=true, EntryPoint="poll")]
1536                 private static extern int sys_poll (_pollfd[] ufds, uint nfds, int timeout);
1537
1538                 public static int poll (Pollfd [] fds, uint nfds, int timeout)
1539                 {
1540                         if (fds.Length < nfds)
1541                                 throw new ArgumentOutOfRangeException ("fds", "Must refer to at least `nfds' elements");
1542
1543                         _pollfd[] send = new _pollfd[nfds];
1544
1545                         for (int i = 0; i < send.Length; i++) {
1546                                 send [i].fd     = fds [i].fd;
1547                                 send [i].events = UnixConvert.FromPollEvents (fds [i].events);
1548                         }
1549
1550                         int r = sys_poll (send, nfds, timeout);
1551
1552                         for (int i = 0; i < send.Length; i++) {
1553                                 fds [i].revents = UnixConvert.ToPollEvents (send [i].revents);
1554                         }
1555
1556                         return r;
1557                 }
1558
1559                 public static int poll (Pollfd [] fds, int timeout)
1560                 {
1561                         return poll (fds, (uint) fds.Length, timeout);
1562                 }
1563
1564                 //
1565                 // <sys/ptrace.h>
1566                 //
1567
1568                 // TODO: ptrace(2)
1569
1570                 //
1571                 // <sys/resource.h>
1572                 //
1573
1574                 // TODO: setrlimit(2)
1575                 // TODO: getrlimit(2)
1576                 // TODO: getrusage(2)
1577
1578                 #endregion
1579
1580                 #region <sys/sendfile.h> Declarations
1581                 //
1582                 // <sys/sendfile.h> -- COMPLETE
1583                 //
1584
1585                 [DllImport (MPH, SetLastError=true,
1586                                 EntryPoint="Mono_Posix_Syscall_sendfile")]
1587                 public static extern long sendfile (int out_fd, int in_fd,
1588                                 ref long offset, ulong count);
1589
1590                 #endregion
1591
1592                 #region <sys/stat.h> Declarations
1593                 //
1594                 // <sys/stat.h>  -- COMPLETE
1595                 //
1596                 [DllImport (MPH, SetLastError=true,
1597                                 EntryPoint="Mono_Posix_Syscall_stat")]
1598                 public static extern int stat (string file_name, out Stat buf);
1599
1600                 [DllImport (MPH, SetLastError=true,
1601                                 EntryPoint="Mono_Posix_Syscall_fstat")]
1602                 public static extern int fstat (int filedes, out Stat buf);
1603
1604                 [DllImport (MPH, SetLastError=true,
1605                                 EntryPoint="Mono_Posix_Syscall_lstat")]
1606                 public static extern int lstat (string file_name, out Stat buf);
1607
1608                 // chmod(2)
1609                 //    int chmod(const char *path, mode_t mode);
1610                 [DllImport (LIBC, SetLastError=true, EntryPoint="chmod")]
1611                 private static extern int sys_chmod (string path, uint mode);
1612
1613                 public static int chmod (string path, FilePermissions mode)
1614                 {
1615                         uint _mode = UnixConvert.FromFilePermissions (mode);
1616                         return sys_chmod (path, _mode);
1617                 }
1618
1619                 // fchmod(2)
1620                 //    int chmod(int filedes, mode_t mode);
1621                 [DllImport (LIBC, SetLastError=true, EntryPoint="fchmod")]
1622                 private static extern int sys_fchmod (int filedes, uint mode);
1623
1624                 public static int fchmod (int filedes, FilePermissions mode)
1625                 {
1626                         uint _mode = UnixConvert.FromFilePermissions (mode);
1627                         return sys_fchmod (filedes, _mode);
1628                 }
1629
1630                 // umask(2)
1631                 //    mode_t umask(mode_t mask);
1632                 [DllImport (LIBC, SetLastError=true, EntryPoint="umask")]
1633                 private static extern uint sys_umask (uint mask);
1634
1635                 public static FilePermissions umask (FilePermissions mask)
1636                 {
1637                         uint _mask = UnixConvert.FromFilePermissions (mask);
1638                         uint r = sys_umask (_mask);
1639                         return UnixConvert.ToFilePermissions (r);
1640                 }
1641
1642                 // mkdir(2)
1643                 //    int mkdir(const char *pathname, mode_t mode);
1644                 [DllImport (LIBC, SetLastError=true, EntryPoint="mkdir")]
1645                 public static extern int sys_mkdir (string oldpath, uint mode);
1646
1647                 public static int mkdir (string oldpath, FilePermissions mode)
1648                 {
1649                         uint _mode = UnixConvert.FromFilePermissions (mode);
1650                         return sys_mkdir (oldpath, _mode);
1651                 }
1652
1653                 // mknod(2)
1654                 //    int mknod (const char *pathname, mode_t mode, dev_t dev);
1655                 [DllImport (MPH, SetLastError=true,
1656                                 EntryPoint="Mono_Posix_Syscall_mknod")]
1657                 public static extern int mknod (string pathname, FilePermissions mode, ulong dev);
1658
1659                 // mkfifo(3)
1660                 //    int mkfifo(const char *pathname, mode_t mode);
1661                 [DllImport (LIBC, SetLastError=true, EntryPoint="mkfifo")]
1662                 private static extern int sys_mkfifo (string pathname, uint mode);
1663
1664                 public static int mkfifo (string pathname, FilePermissions mode)
1665                 {
1666                         uint _mode = UnixConvert.FromFilePermissions (mode);
1667                         return sys_mkfifo (pathname, _mode);
1668                 }
1669
1670                 #endregion
1671
1672                 #region <sys/time.h> Declarations
1673                 //
1674                 // <sys/time.h>
1675                 //
1676                 // TODO: adjtime(), getitimer(2), setitimer(2), lutimes(), futimes()
1677
1678                 [DllImport (MPH, SetLastError=true,
1679                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1680                 public static extern int gettimeofday (out Timeval tv, out Timezone tz);
1681
1682                 [DllImport (MPH, SetLastError=true,
1683                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1684                 private static extern int gettimeofday (out Timeval tv, IntPtr ignore);
1685
1686                 public static int gettimeofday (out Timeval tv)
1687                 {
1688                         return gettimeofday (out tv, IntPtr.Zero);
1689                 }
1690
1691                 [DllImport (MPH, SetLastError=true,
1692                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1693                 private static extern int gettimeofday (IntPtr ignore, out Timezone tz);
1694
1695                 public static int gettimeofday (out Timezone tz)
1696                 {
1697                         return gettimeofday (IntPtr.Zero, out tz);
1698                 }
1699
1700                 [DllImport (MPH, SetLastError=true,
1701                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1702                 public static extern int settimeofday (ref Timeval tv, ref Timezone tz);
1703
1704                 [DllImport (MPH, SetLastError=true,
1705                                 EntryPoint="Mono_Posix_Syscall_gettimeofday")]
1706                 private static extern int settimeofday (ref Timeval tv, IntPtr ignore);
1707
1708                 public static int settimeofday (ref Timeval tv)
1709                 {
1710                         return settimeofday (ref tv, IntPtr.Zero);
1711                 }
1712
1713                 [DllImport (MPH, SetLastError=true,
1714                                 EntryPoint="Mono_Posix_Syscall_utimes")]
1715                 public static extern int utimes (string filename, ref Timeval tvp);
1716
1717                 #endregion
1718
1719                 //
1720                 // <sys/timeb.h>
1721                 //
1722
1723                 // TODO: ftime(3)
1724
1725                 //
1726                 // <sys/times.h>
1727                 //
1728
1729                 // TODO: times(2)
1730
1731                 #region <sys/wait.h> Declarations
1732                 //
1733                 // <sys/wait.h>
1734                 //
1735
1736                 // wait(2)
1737                 //    pid_t wait(int *status);
1738                 [DllImport (LIBC, SetLastError=true)]
1739                 public static extern int wait (out int status);
1740
1741                 // waitpid(2)
1742                 //    pid_t waitpid(pid_t pid, int *status, int options);
1743                 [DllImport (LIBC, SetLastError=true)]
1744                 private static extern int waitpid (int pid, out int status, int options);
1745
1746                 public static int waitpid (int pid, out int status, WaitOptions options)
1747                 {
1748                         int _options = UnixConvert.FromWaitOptions (options);
1749                         return waitpid (pid, out status, _options);
1750                 }
1751
1752                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WIFEXITED")]
1753                 private static extern int _WIFEXITED (int status);
1754
1755                 public static bool WIFEXITED (int status)
1756                 {
1757                         return _WIFEXITED (status) != 0;
1758                 }
1759
1760                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WEXITSTATUS")]
1761                 public static extern int WEXITSTATUS (int status);
1762
1763                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WIFSIGNALED")]
1764                 private static extern int _WIFSIGNALED (int status);
1765
1766                 public static bool WIFSIGNALED (int status)
1767                 {
1768                         return _WIFSIGNALED (status) != 0;
1769                 }
1770
1771                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WTERMSIG")]
1772                 private static extern int _WTERMSIG (int status);
1773
1774                 public static Signum WTERMSIG (int status)
1775                 {
1776                         int r = _WTERMSIG (status);
1777                         return UnixConvert.ToSignum (r);
1778                 }
1779
1780                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WIFSTOPPED")]
1781                 private static extern int _WIFSTOPPED (int status);
1782
1783                 public static bool WIFSTOPPED (int status)
1784                 {
1785                         return _WIFSTOPPED (status) != 0;
1786                 }
1787
1788                 [DllImport (MPH, EntryPoint="Mono_Posix_Syscall_WSTOPSIG")]
1789                 private static extern int _WSTOPSIG (int status);
1790
1791                 public static Signum WSTOPSIG (int status)
1792                 {
1793                         int r = _WSTOPSIG (status);
1794                         return UnixConvert.ToSignum (r);
1795                 }
1796
1797                 //
1798                 // <termios.h>
1799                 //
1800
1801                 #endregion
1802
1803                 #region <time.h> Declarations
1804                 //
1805                 // <time.h>
1806                 //
1807
1808                 // stime(2)
1809                 //    int stime(time_t *t);
1810                 [DllImport (MPH, SetLastError=true,
1811                                 EntryPoint="Mono_Posix_Syscall_stime")]
1812                 public static extern int stime (ref long t);
1813
1814                 // time(2)
1815                 //    time_t time(time_t *t);
1816                 [DllImport (MPH, SetLastError=true,
1817                                 EntryPoint="Mono_Posix_Syscall_time")]
1818                 public static extern long time (out long t);
1819
1820                 //
1821                 // <ulimit.h>
1822                 //
1823
1824                 // TODO: ulimit(3)
1825
1826                 #endregion
1827
1828                 #region <unistd.h> Declarations
1829                 //
1830                 // <unistd.h>
1831                 //
1832                 // TODO: euidaccess(), usleep(3), get_current_dir_name(), group_member(),
1833                 //       other TODOs listed below.
1834
1835                 [DllImport (LIBC, SetLastError=true, EntryPoint="access")]
1836                 private static extern int sys_access (string pathname, int mode);
1837
1838                 public static int access (string pathname, AccessMode mode)
1839                 {
1840                         int _mode = UnixConvert.FromAccessMode (mode);
1841                         return sys_access (pathname, _mode);
1842                 }
1843
1844                 // lseek(2)
1845                 //    off_t lseek(int filedes, off_t offset, int whence);
1846                 [DllImport (MPH, SetLastError=true,
1847                                 EntryPoint="Mono_Posix_Syscall_lseek")]
1848                 public static extern long lseek (int fd, long offset, SeekFlags whence);
1849
1850     [DllImport (LIBC, SetLastError=true)]
1851                 public static extern int close (int fd);
1852
1853                 // read(2)
1854                 //    ssize_t read(int fd, void *buf, size_t count);
1855                 [DllImport (MPH, SetLastError=true,
1856                                 EntryPoint="Mono_Posix_Syscall_read")]
1857                 public static extern long read (int fd, IntPtr buf, ulong count);
1858
1859                 public static unsafe long read (int fd, void *buf, ulong count)
1860                 {
1861                         return read (fd, (IntPtr) buf, count);
1862                 }
1863
1864                 // write(2)
1865                 //    ssize_t write(int fd, const void *buf, size_t count);
1866                 [DllImport (MPH, SetLastError=true,
1867                                 EntryPoint="Mono_Posix_Syscall_write")]
1868                 public static extern long write (int fd, IntPtr buf, ulong count);
1869
1870                 public static unsafe long write (int fd, void *buf, ulong count)
1871                 {
1872                         return write (fd, (IntPtr) buf, count);
1873                 }
1874
1875                 // pread(2)
1876                 //    ssize_t pread(int fd, void *buf, size_t count, off_t offset);
1877                 [DllImport (MPH, SetLastError=true,
1878                                 EntryPoint="Mono_Posix_Syscall_pread")]
1879                 public static extern long pread (int fd, IntPtr buf, ulong count, long offset);
1880
1881                 public static unsafe long pread (int fd, void *buf, ulong count, long offset)
1882                 {
1883                         return pread (fd, (IntPtr) buf, count, offset);
1884                 }
1885
1886                 // pwrite(2)
1887                 //    ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
1888                 [DllImport (MPH, SetLastError=true,
1889                                 EntryPoint="Mono_Posix_Syscall_pwrite")]
1890                 public static extern long pwrite (int fd, IntPtr buf, ulong count, long offset);
1891
1892                 public static unsafe long pwrite (int fd, void *buf, ulong count, long offset)
1893                 {
1894                         return pwrite (fd, (IntPtr) buf, count, offset);
1895                 }
1896
1897                 [DllImport (MPH, SetLastError=true,
1898                                 EntryPoint="Mono_Posix_Syscall_pipe")]
1899                 public static extern int pipe (out int reading, out int writing);
1900
1901                 public static int pipe (int[] filedes)
1902                 {
1903                         if (filedes == null || filedes.Length != 2) {
1904                                 // TODO: set errno
1905                                 return -1;
1906                         }
1907                         int reading, writing;
1908                         int r = pipe (out reading, out writing);
1909                         filedes[0] = reading;
1910                         filedes[1] = writing;
1911                         return r;
1912                 }
1913
1914                 [DllImport (LIBC, SetLastError=true)]
1915                 public static extern uint alarm (uint seconds);
1916
1917                 [DllImport (LIBC, SetLastError=true)]
1918                 public static extern uint sleep (uint seconds);
1919
1920                 [DllImport (LIBC, SetLastError=true)]
1921                 public static extern uint ualarm (uint usecs, uint interval);
1922
1923                 [DllImport (LIBC, SetLastError=true)]
1924                 public static extern int pause ();
1925
1926                 // chown(2)
1927                 //    int chown(const char *path, uid_t owner, gid_t group);
1928                 [DllImport (LIBC, SetLastError=true)]
1929                 public static extern int chown (string path, uint owner, uint group);
1930
1931                 // fchown(2)
1932                 //    int fchown(int fd, uid_t owner, gid_t group);
1933                 [DllImport (LIBC, SetLastError=true)]
1934                 public static extern int fchown (int fd, uint owner, uint group);
1935
1936                 // lchown(2)
1937                 //    int lchown(const char *path, uid_t owner, gid_t group);
1938                 [DllImport (LIBC, SetLastError=true)]
1939                 public static extern int lchown (string path, uint owner, uint group);
1940
1941                 [DllImport (LIBC, SetLastError=true)]
1942                 public static extern int chdir (string path);
1943
1944                 [DllImport (LIBC, SetLastError=true)]
1945                 public static extern int fchdir (int fd);
1946
1947                 // getcwd(3)
1948                 //    char *getcwd(char *buf, size_t size);
1949                 [DllImport (MPH, SetLastError=true,
1950                                 EntryPoint="Mono_Posix_Syscall_getcwd")]
1951                 public static extern IntPtr getcwd ([Out] StringBuilder buf, ulong size);
1952
1953                 public static StringBuilder getcwd (StringBuilder buf)
1954                 {
1955                         getcwd (buf, (ulong) buf.Capacity);
1956                         return buf;
1957                 }
1958
1959                 // getwd(2) is deprecated; don't expose it.
1960
1961                 [DllImport (LIBC, SetLastError=true)]
1962                 public static extern int dup (int fd);
1963
1964                 [DllImport (LIBC, SetLastError=true)]
1965                 public static extern int dup2 (int fd, int fd2);
1966
1967                 // TODO: does Mono marshal arrays properly?
1968                 [DllImport (LIBC, SetLastError=true)]
1969                 public static extern int execve (string path, string[] argv, string[] envp);
1970
1971                 [DllImport (LIBC, SetLastError=true)]
1972                 public static extern int fexecve (int fd, string[] argv, string[] envp);
1973
1974                 [DllImport (LIBC, SetLastError=true)]
1975                 public static extern int execv (string path, string[] argv);
1976
1977                 // TODO: execle, execl, execlp
1978                 [DllImport (LIBC, SetLastError=true)]
1979                 public static extern int execvp (string path, string[] argv);
1980
1981                 [DllImport (LIBC, SetLastError=true)]
1982                 public static extern int nice (int inc);
1983
1984                 [DllImport (LIBC, SetLastError=true)]
1985                 public static extern int _exit (int status);
1986
1987                 [DllImport (MPH, SetLastError=true,
1988                                 EntryPoint="Mono_Posix_Syscall_fpathconf")]
1989                 public static extern long fpathconf (int filedes, PathConf name);
1990
1991                 [DllImport (MPH, SetLastError=true,
1992                                 EntryPoint="Mono_Posix_Syscall_pathconf")]
1993                 public static extern long pathconf (string path, PathConf name);
1994
1995                 [DllImport (MPH, SetLastError=true,
1996                                 EntryPoint="Mono_Posix_Syscall_sysconf")]
1997                 public static extern long sysconf (SysConf name);
1998
1999                 // confstr(3)
2000                 //    size_t confstr(int name, char *buf, size_t len);
2001                 [DllImport (MPH, SetLastError=true,
2002                                 EntryPoint="Mono_Posix_Syscall_confstr")]
2003                 public static extern ulong confstr (ConfStr name, [Out] StringBuilder buf, ulong len);
2004
2005                 // getpid(2)
2006                 //    pid_t getpid(void);
2007                 [DllImport (LIBC, SetLastError=true)]
2008                 public static extern int getpid ();
2009
2010                 // getppid(2)
2011                 //    pid_t getppid(void);
2012                 [DllImport (LIBC, SetLastError=true)]
2013                 public static extern int getppid ();
2014
2015                 // setpgid(2)
2016                 //    int setpgid(pid_t pid, pid_t pgid);
2017                 [DllImport (LIBC, SetLastError=true)]
2018                 public static extern int setpgid (int pid, int pgid);
2019
2020                 // getpgid(2)
2021                 //    pid_t getpgid(pid_t pid);
2022                 [DllImport (LIBC, SetLastError=true)]
2023                 public static extern int getpgid (int pid);
2024
2025                 [DllImport (LIBC, SetLastError=true)]
2026                 public static extern int setpgrp ();
2027
2028                 // getpgrp(2)
2029                 //    pid_t getpgrp(void);
2030                 [DllImport (LIBC, SetLastError=true)]
2031                 public static extern int getpgrp ();
2032
2033                 // setsid(2)
2034                 //    pid_t setsid(void);
2035                 [DllImport (LIBC, SetLastError=true)]
2036                 public static extern int setsid ();
2037
2038                 // getsid(2)
2039                 //    pid_t getsid(pid_t pid);
2040                 [DllImport (LIBC, SetLastError=true)]
2041                 public static extern int getsid (int pid);
2042
2043                 // getuid(2)
2044                 //    uid_t getuid(void);
2045                 [DllImport (LIBC, SetLastError=true)]
2046                 public static extern uint getuid ();
2047
2048                 // geteuid(2)
2049                 //    uid_t geteuid(void);
2050                 [DllImport (LIBC, SetLastError=true)]
2051                 public static extern uint geteuid ();
2052
2053                 // getgid(2)
2054                 //    gid_t getgid(void);
2055                 [DllImport (LIBC, SetLastError=true)]
2056                 public static extern uint getgid ();
2057
2058                 // getegid(2)
2059                 //    gid_t getgid(void);
2060                 [DllImport (LIBC, SetLastError=true)]
2061                 public static extern uint getegid ();
2062
2063                 // getgroups(2)
2064                 //    int getgroups(int size, gid_t list[]);
2065                 [DllImport (LIBC, SetLastError=true)]
2066                 public static extern int getgroups (int size, uint[] list);
2067
2068                 public static int getgroups (uint[] list)
2069                 {
2070                         return getgroups (list.Length, list);
2071                 }
2072
2073                 // setuid(2)
2074                 //    int setuid(uid_t uid);
2075                 [DllImport (LIBC, SetLastError=true)]
2076                 public static extern int setuid (uint uid);
2077
2078                 // setreuid(2)
2079                 //    int setreuid(uid_t ruid, uid_t euid);
2080                 [DllImport (LIBC, SetLastError=true)]
2081                 public static extern int setreuid (uint ruid, uint euid);
2082
2083                 // setregid(2)
2084                 //    int setregid(gid_t ruid, gid_t euid);
2085                 [DllImport (LIBC, SetLastError=true)]
2086                 public static extern int setregid (uint rgid, uint egid);
2087
2088                 // seteuid(2)
2089                 //    int seteuid(uid_t euid);
2090                 [DllImport (LIBC, SetLastError=true)]
2091                 public static extern int seteuid (uint euid);
2092
2093                 // setegid(2)
2094                 //    int setegid(gid_t euid);
2095                 [DllImport (LIBC, SetLastError=true)]
2096                 public static extern int setegid (uint uid);
2097
2098                 // setgid(2)
2099                 //    int setgid(gid_t gid);
2100                 [DllImport (LIBC, SetLastError=true)]
2101                 public static extern int setgid (uint gid);
2102
2103                 // getresuid(2)
2104                 //    int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
2105                 [DllImport (LIBC, SetLastError=true)]
2106                 public static extern int getresuid (out uint ruid, out uint euid, out uint suid);
2107
2108                 // getresgid(2)
2109                 //    int getresgid(gid_t *ruid, gid_t *euid, gid_t *suid);
2110                 [DllImport (LIBC, SetLastError=true)]
2111                 public static extern int getresgid (out uint rgid, out uint egid, out uint sgid);
2112
2113                 // setresuid(2)
2114                 //    int setresuid(uid_t ruid, uid_t euid, uid_t suid);
2115                 [DllImport (LIBC, SetLastError=true)]
2116                 public static extern int setresuid (uint ruid, uint euid, uint suid);
2117
2118                 // setresgid(2)
2119                 //    int setresgid(gid_t ruid, gid_t euid, gid_t suid);
2120                 [DllImport (LIBC, SetLastError=true)]
2121                 public static extern int setresgid (uint rgid, uint egid, uint sgid);
2122
2123                 // fork(2)
2124                 //    pid_t fork(void);
2125                 [DllImport (LIBC, SetLastError=true)]
2126                 [Obsolete ("DO NOT directly call fork(2); it bypasses essential " +
2127                                 "shutdown code.\nUse System.Diagnostics.Process instead")]
2128                 public static extern int fork ();
2129
2130                 // vfork(2)
2131                 //    pid_t vfork(void);
2132                 [DllImport (LIBC, SetLastError=true)]
2133                 [Obsolete ("DO NOT directly call vfork(2); it bypasses essential " +
2134                                 "shutdown code.\nUse System.Diagnostics.Process instead")]
2135                 public static extern int vfork ();
2136
2137                 [DllImport (LIBC, SetLastError=true, EntryPoint="ttyname")]
2138                 [Obsolete ("Not re-entrant.  Use ttyname_r instead.")]
2139                 public static extern IntPtr sys_ttyname (int fd);
2140
2141                 [Obsolete ("Not re-entrant.  Use ttyname_r instead.")]
2142                 public static string ttyname (int fd)
2143                 {
2144                         IntPtr r = sys_ttyname (fd);
2145                         return UnixMarshal.PtrToString (r);
2146                 }
2147
2148                 // ttyname_r(3)
2149                 //    int ttyname_r(int fd, char *buf, size_t buflen);
2150                 [DllImport (MPH, SetLastError=true,
2151                                 EntryPoint="Mono_Posix_Syscall_ttyname_r")]
2152                 public static extern int ttyname_r (int fd, [Out] StringBuilder buf, ulong buflen);
2153
2154                 public static int ttyname_r (int fd, StringBuilder buf)
2155                 {
2156                         return ttyname_r (fd, buf, (ulong) buf.Capacity);
2157                 }
2158
2159                 [DllImport (LIBC, EntryPoint="isatty")]
2160                 private static extern int sys_isatty (int fd);
2161
2162                 public static bool isatty (int fd)
2163                 {
2164                         return sys_isatty (fd) == 1;
2165                 }
2166
2167                 [DllImport (LIBC, SetLastError=true)]
2168                 public static extern int link (string oldpath, string newpath);
2169
2170                 [DllImport (LIBC, SetLastError=true)]
2171                 public static extern int symlink (string oldpath, string newpath);
2172
2173                 // readlink(2)
2174                 //    int readlink(const char *path, char *buf, size_t bufsize);
2175                 [DllImport (MPH, SetLastError=true,
2176                                 EntryPoint="Mono_Posix_Syscall_readlink")]
2177                 public static extern int readlink (string path, [Out] StringBuilder buf, ulong bufsiz);
2178
2179                 public static int readlink (string path, [Out] StringBuilder buf)
2180                 {
2181                         return readlink (path, buf, (ulong) buf.Capacity);
2182                 }
2183
2184                 [DllImport (LIBC, SetLastError=true)]
2185                 public static extern int unlink (string pathname);
2186
2187                 [DllImport (LIBC, SetLastError=true)]
2188                 public static extern int rmdir (string pathname);
2189
2190                 // tcgetpgrp(3)
2191                 //    pid_t tcgetpgrp(int fd);
2192                 [DllImport (LIBC, SetLastError=true)]
2193                 public static extern int tcgetpgrp (int fd);
2194
2195                 // tcsetpgrp(3)
2196                 //    int tcsetpgrp(int fd, pid_t pgrp);
2197                 [DllImport (LIBC, SetLastError=true)]
2198                 public static extern int tcsetpgrp (int fd, int pgrp);
2199
2200                 [DllImport (LIBC, SetLastError=true, EntryPoint="getlogin")]
2201                 [Obsolete ("Not re-entrant.  Use getlogin_r instead.")]
2202                 public static extern IntPtr sys_getlogin ();
2203
2204                 [Obsolete ("Not re-entrant.  Use getlogin_r instead.")]
2205                 public static string getlogin ()
2206                 {
2207                         IntPtr r = sys_getlogin ();
2208                         return UnixMarshal.PtrToString (r);
2209                 }
2210
2211                 // getlogin_r(3)
2212                 //    int getlogin_r(char *buf, size_t bufsize);
2213                 [DllImport (MPH, SetLastError=true,
2214                                 EntryPoint="Mono_Posix_Syscall_getlogin_r")]
2215                 public static extern int getlogin_r ([Out] StringBuilder name, ulong bufsize);
2216
2217                 public static int getlogin_r (StringBuilder name)
2218                 {
2219                         return getlogin_r (name, (ulong) name.Capacity);
2220                 }
2221
2222                 [DllImport (LIBC, SetLastError=true)]
2223                 public static extern int setlogin (string name);
2224
2225                 // gethostname(2)
2226                 //    int gethostname(char *name, size_t len);
2227                 [DllImport (MPH, SetLastError=true,
2228                                 EntryPoint="Mono_Posix_Syscall_gethostname")]
2229                 public static extern int gethostname ([Out] StringBuilder name, ulong len);
2230
2231                 public static int gethostname (StringBuilder name)
2232                 {
2233                         return gethostname (name, (ulong) name.Capacity);
2234                 }
2235
2236                 // sethostname(2)
2237                 //    int gethostname(const char *name, size_t len);
2238                 [DllImport (MPH, SetLastError=true,
2239                                 EntryPoint="Mono_Posix_Syscall_gethostname")]
2240                 public static extern int sethostname (string name, ulong len);
2241
2242                 public static int sethostname (string name)
2243                 {
2244                         return sethostname (name, (ulong) name.Length);
2245                 }
2246
2247                 [DllImport (MPH, SetLastError=true,
2248                                 EntryPoint="Mono_Posix_Syscall_gethostid")]
2249                 public static extern long gethostid ();
2250
2251                 [DllImport (MPH, SetLastError=true,
2252                                 EntryPoint="Mono_Posix_Syscall_sethostid")]
2253                 public static extern int sethostid (long hostid);
2254
2255                 // getdomainname(2)
2256                 //    int getdomainname(char *name, size_t len);
2257                 [DllImport (MPH, SetLastError=true,
2258                                 EntryPoint="Mono_Posix_Syscall_getdomainname")]
2259                 public static extern int getdomainname ([Out] StringBuilder name, ulong len);
2260
2261                 public static int getdomainname (StringBuilder name)
2262                 {
2263                         return getdomainname (name, (ulong) name.Capacity);
2264                 }
2265
2266                 // setdomainname(2)
2267                 //    int setdomainname(const char *name, size_t len);
2268                 [DllImport (MPH, SetLastError=true,
2269                                 EntryPoint="Mono_Posix_Syscall_setdomainname")]
2270                 public static extern int setdomainname (string name, ulong len);
2271
2272                 public static int setdomainname (string name)
2273                 {
2274                         return setdomainname (name, (ulong) name.Length);
2275                 }
2276
2277                 [DllImport (LIBC, SetLastError=true)]
2278                 public static extern int vhangup ();
2279
2280                 // Revoke doesn't appear to be POSIX.  Include it?
2281                 [DllImport (LIBC, SetLastError=true)]
2282                 public static extern int revoke (string file);
2283
2284                 // TODO: profil?  It's not POSIX.
2285
2286                 [DllImport (LIBC, SetLastError=true)]
2287                 public static extern int acct (string filename);
2288
2289                 [DllImport (LIBC, SetLastError=true, EntryPoint="getusershell")]
2290                 public static extern IntPtr sys_getusershell ();
2291
2292                 public static string getusershell ()
2293                 {
2294                         IntPtr r = sys_getusershell ();
2295                         return UnixMarshal.PtrToString (r);
2296                 }
2297
2298                 [DllImport (LIBC, SetLastError=true)]
2299                 public static extern void setusershell ();
2300
2301                 [DllImport (LIBC, SetLastError=true)]
2302                 public static extern void endusershell ();
2303
2304                 [DllImport (LIBC, SetLastError=true)]
2305                 private static extern int daemon (int nochdir, int noclose);
2306
2307                 public static int daemon (bool nochdir, bool noclose)
2308                 {
2309                         return daemon (nochdir ? 1 : 0, noclose ? 1 : 0);
2310                 }
2311
2312                 [DllImport (LIBC, SetLastError=true)]
2313                 public static extern int chroot (string path);
2314
2315                 // skipping getpass(3) as the man page states:
2316                 //   This function is obsolete.  Do not use it.
2317
2318                 [DllImport (LIBC, SetLastError=true)]
2319                 public static extern int fsync (int fd);
2320
2321                 [DllImport (LIBC, SetLastError=true)]
2322                 public static extern int fdatasync (int fd);
2323
2324                 [DllImport (LIBC, SetLastError=true)]
2325                 public static extern void sync ();
2326
2327                 [DllImport (LIBC, SetLastError=true)]
2328                 [Obsolete ("Dropped in POSIX 1003.1-2001.  " +
2329                                 "Use Unistd.sysconf (SysConf._SC_PAGESIZE).")]
2330                 public static extern int getpagesize ();
2331
2332                 // truncate(2)
2333                 //    int truncate(const char *path, off_t length);
2334                 [DllImport (MPH, SetLastError=true,
2335                                 EntryPoint="Mono_Posix_Syscall_truncate")]
2336                 public static extern int truncate (string path, long length);
2337
2338                 // ftruncate(2)
2339                 //    int ftruncate(int fd, off_t length);
2340                 [DllImport (MPH, SetLastError=true,
2341                                 EntryPoint="Mono_Posix_Syscall_ftruncate")]
2342                 public static extern int ftruncate (int fd, long length);
2343
2344                 [DllImport (LIBC, SetLastError=true)]
2345                 public static extern int getdtablesize ();
2346
2347                 [DllImport (LIBC, SetLastError=true)]
2348                 public static extern int brk (IntPtr end_data_segment);
2349
2350                 [DllImport (LIBC, SetLastError=true)]
2351                 public static extern IntPtr sbrk (IntPtr increment);
2352
2353                 // TODO: syscall(2)?
2354                 // Probably safer to skip entirely.
2355
2356                 // lockf(3)
2357                 //    int lockf(int fd, int cmd, off_t len);
2358                 [DllImport (MPH, SetLastError=true,
2359                                 EntryPoint="Mono_Posix_Syscall_lockf")]
2360                 public static extern int lockf (int fd, LockFlags cmd, long len);
2361
2362                 [DllImport (CRYPT, SetLastError=true, EntryPoint="crypt")]
2363                 public static extern IntPtr sys_crypt (string key, string salt);
2364
2365                 public static string crypt (string key, string salt)
2366                 {
2367                         IntPtr r = sys_crypt (key, salt);
2368                         return UnixMarshal.PtrToString (r);
2369                 }
2370
2371                 [DllImport (CRYPT, SetLastError=true, EntryPoint="encrypt")]
2372                 private static extern void sys_encrypt ([In, Out] byte[] block, int edflag);
2373
2374                 public static void encrypt (byte[] block, bool decode)
2375                 {
2376                         if (block.Length < 64)
2377                                 throw new ArgumentOutOfRangeException ("block", "Must refer to at least 64 bytes");
2378                         sys_encrypt (block, decode ? 1 : 0);
2379                 }
2380
2381                 // swab(3)
2382                 //    void swab(const void *from, void *to, ssize_t n);
2383                 [DllImport (MPH, SetLastError=true,
2384                                 EntryPoint="Mono_Posix_Syscall_swab")]
2385                 public static extern void swab (IntPtr from, IntPtr to, long n);
2386
2387                 public static unsafe void swab (void* from, void* to, long n)
2388                 {
2389                         swab ((IntPtr) from, (IntPtr) to, n);
2390                 }
2391
2392                 #endregion
2393
2394                 #region <utime.h> Declarations
2395                 //
2396                 // <utime.h>  -- COMPLETE
2397                 //
2398
2399                 [DllImport (MPH, SetLastError=true,
2400                                 EntryPoint="Mono_Posix_Syscall_utime")]
2401                 public static extern int utime (string filename, ref Utimbuf buf);
2402
2403                 [DllImport (MPH, SetLastError=true,
2404                                 EntryPoint="Mono_Posix_Syscall_utime")]
2405                 private static extern int utime (string filename, IntPtr buf);
2406
2407                 public static int utime (string filename)
2408                 {
2409                         return utime (filename, IntPtr.Zero);
2410                 }
2411                 #endregion
2412         }
2413 }
2414
2415 // vim: noexpandtab