mcs/class/Mono.Posix/Mono.Unix.Native/Stdlib.cs

   1 //
   2 // Mono.Unix/Stdlib.cs
   3 //
   4 // Authors:
   5 //   Jonathan Pryor (jonpryor@vt.edu)
   6 //
   7 // (C) 2004-2006 Jonathan Pryor
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Collections;
  31 using System.IO;
  32 using System.Runtime.InteropServices;
  33 using System.Text;
  34 using Mono.Unix.Native;
  35
  36 namespace Mono.Unix.Native {
  37
  38         #region Enumerations
  39
  40         [Map]
  41         public enum Errno : int {
  42                 // errors & their values liberally copied from
  43                 // FC2 /usr/include/asm/errno.h
  44
  45                 EPERM           =   1, // Operation not permitted
  46                 ENOENT          =   2, // No such file or directory
  47                 ESRCH           =   3, // No such process
  48                 EINTR           =   4, // Interrupted system call
  49                 EIO             =   5, // I/O error
  50                 ENXIO           =   6, // No such device or address
  51                 E2BIG           =   7, // Arg list too long
  52                 ENOEXEC         =   8, // Exec format error
  53                 EBADF           =   9, // Bad file number
  54                 ECHILD          =  10, // No child processes
  55                 EAGAIN          =  11, // Try again
  56                 ENOMEM          =  12, // Out of memory
  57                 EACCES          =  13, // Permission denied
  58                 EFAULT          =  14, // Bad address
  59                 ENOTBLK         =  15, // Block device required
  60                 EBUSY           =  16, // Device or resource busy
  61                 EEXIST          =  17, // File exists
  62                 EXDEV           =  18, // Cross-device link
  63                 ENODEV          =  19, // No such device
  64                 ENOTDIR         =  20, // Not a directory
  65                 EISDIR          =  21, // Is a directory
  66                 EINVAL          =  22, // Invalid argument
  67                 ENFILE          =  23, // File table overflow
  68                 EMFILE          =  24, // Too many open files
  69                 ENOTTY          =  25, // Not a typewriter
  70                 ETXTBSY         =  26, // Text file busy
  71                 EFBIG           =  27, // File too large
  72                 ENOSPC          =  28, // No space left on device
  73                 ESPIPE          =  29, // Illegal seek
  74                 EROFS           =  30, // Read-only file system
  75                 EMLINK          =  31, // Too many links
  76                 EPIPE           =  32, // Broken pipe
  77                 EDOM            =  33, // Math argument out of domain of func
  78                 ERANGE          =  34, // Math result not representable
  79                 EDEADLK         =  35, // Resource deadlock would occur
  80                 ENAMETOOLONG    =  36, // File name too long
  81                 ENOLCK          =  37, // No record locks available
  82                 ENOSYS          =  38, // Function not implemented
  83                 ENOTEMPTY       =  39, // Directory not empty
  84                 ELOOP           =  40, // Too many symbolic links encountered
  85                 EWOULDBLOCK     =  EAGAIN, // Operation would block
  86                 ENOMSG          =  42, // No message of desired type
  87                 EIDRM           =  43, // Identifier removed
  88                 ECHRNG          =  44, // Channel number out of range
  89                 EL2NSYNC        =  45, // Level 2 not synchronized
  90                 EL3HLT          =  46, // Level 3 halted
  91                 EL3RST          =  47, // Level 3 reset
  92                 ELNRNG          =  48, // Link number out of range
  93                 EUNATCH         =  49, // Protocol driver not attached
  94                 ENOCSI          =  50, // No CSI structure available
  95                 EL2HLT          =  51, // Level 2 halted
  96                 EBADE           =  52, // Invalid exchange
  97                 EBADR           =  53, // Invalid request descriptor
  98                 EXFULL          =  54, // Exchange full
  99                 ENOANO          =  55, // No anode
 100                 EBADRQC         =  56, // Invalid request code
 101                 EBADSLT         =  57, // Invalid slot
 102
 103                 EDEADLOCK             =  EDEADLK,
 104
 105                 EBFONT          =  59, // Bad font file format
 106                 ENOSTR          =  60, // Device not a stream
 107                 ENODATA         =  61, // No data available
 108                 ETIME           =  62, // Timer expired
 109                 ENOSR           =  63, // Out of streams resources
 110                 ENONET          =  64, // Machine is not on the network
 111                 ENOPKG          =  65, // Package not installed
 112                 EREMOTE         =  66, // Object is remote
 113                 ENOLINK         =  67, // Link has been severed
 114                 EADV            =  68, // Advertise error
 115                 ESRMNT          =  69, // Srmount error
 116                 ECOMM           =  70, // Communication error on send
 117                 EPROTO          =  71, // Protocol error
 118                 EMULTIHOP       =  72, // Multihop attempted
 119                 EDOTDOT         =  73, // RFS specific error
 120                 EBADMSG         =  74, // Not a data message
 121                 EOVERFLOW       =  75, // Value too large for defined data type
 122                 ENOTUNIQ        =  76, // Name not unique on network
 123                 EBADFD          =  77, // File descriptor in bad state
 124                 EREMCHG         =  78, // Remote address changed
 125                 ELIBACC         =  79, // Can not access a needed shared library
 126                 ELIBBAD         =  80, // Accessing a corrupted shared library
 127                 ELIBSCN         =  81, // .lib section in a.out corrupted
 128                 ELIBMAX         =  82, // Attempting to link in too many shared libraries
 129                 ELIBEXEC        =  83, // Cannot exec a shared library directly
 130                 EILSEQ          =  84, // Illegal byte sequence
 131                 ERESTART        =  85, // Interrupted system call should be restarted
 132                 ESTRPIPE        =  86, // Streams pipe error
 133                 EUSERS          =  87, // Too many users
 134                 ENOTSOCK        =  88, // Socket operation on non-socket
 135                 EDESTADDRREQ    =  89, // Destination address required
 136                 EMSGSIZE        =  90, // Message too long
 137                 EPROTOTYPE      =  91, // Protocol wrong type for socket
 138                 ENOPROTOOPT     =  92, // Protocol not available
 139                 EPROTONOSUPPORT =  93, // Protocol not supported
 140                 ESOCKTNOSUPPORT =  94, // Socket type not supported
 141                 EOPNOTSUPP      =  95, // Operation not supported on transport endpoint
 142                 EPFNOSUPPORT    =  96, // Protocol family not supported
 143                 EAFNOSUPPORT    =  97, // Address family not supported by protocol
 144                 EADDRINUSE      =  98, // Address already in use
 145                 EADDRNOTAVAIL   =  99, // Cannot assign requested address
 146                 ENETDOWN        = 100, // Network is down
 147                 ENETUNREACH     = 101, // Network is unreachable
 148                 ENETRESET       = 102, // Network dropped connection because of reset
 149                 ECONNABORTED    = 103, // Software caused connection abort
 150                 ECONNRESET      = 104, // Connection reset by peer
 151                 ENOBUFS         = 105, // No buffer space available
 152                 EISCONN         = 106, // Transport endpoint is already connected
 153                 ENOTCONN        = 107, // Transport endpoint is not connected
 154                 ESHUTDOWN       = 108, // Cannot send after transport endpoint shutdown
 155                 ETOOMANYREFS    = 109, // Too many references: cannot splice
 156                 ETIMEDOUT       = 110, // Connection timed out
 157                 ECONNREFUSED    = 111, // Connection refused
 158                 EHOSTDOWN       = 112, // Host is down
 159                 EHOSTUNREACH    = 113, // No route to host
 160                 EALREADY        = 114, // Operation already in progress
 161                 EINPROGRESS     = 115, // Operation now in progress
 162                 ESTALE          = 116, // Stale NFS file handle
 163                 EUCLEAN         = 117, // Structure needs cleaning
 164                 ENOTNAM         = 118, // Not a XENIX named type file
 165                 ENAVAIL         = 119, // No XENIX semaphores available
 166                 EISNAM          = 120, // Is a named type file
 167                 EREMOTEIO       = 121, // Remote I/O error
 168                 EDQUOT          = 122, // Quota exceeded
 169
 170                 ENOMEDIUM       = 123, // No medium found
 171                 EMEDIUMTYPE     = 124, // Wrong medium type
 172         }
 173
 174         #endregion
 175
 176         #region Classes
 177
 178         public sealed class FilePosition : MarshalByRefObject, IDisposable
 179 #if NET_2_0
 180                 , IEquatable <FilePosition>
 181 #endif
 182         {
 183
 184                 private static readonly int FilePositionDumpSize =
 185                         Stdlib.DumpFilePosition (null, new HandleRef (null, IntPtr.Zero), 0);
 186
 187                 private HandleRef pos;
 188
 189                 public FilePosition ()
 190                 {
 191                         IntPtr p = Stdlib.CreateFilePosition ();
 192                         if (p == IntPtr.Zero)
 193                                 throw new OutOfMemoryException ("Unable to malloc fpos_t!");
 194                         pos = new HandleRef (this, p);
 195                 }
 196
 197                 internal HandleRef Handle {
 198                         get {return pos;}
 199                 }
 200
 201                 public void Dispose ()
 202                 {
 203                         Cleanup ();
 204                         GC.SuppressFinalize (this);
 205                 }
 206
 207                 private void Cleanup ()
 208                 {
 209                         if (pos.Handle != IntPtr.Zero) {
 210                                 Stdlib.free (pos.Handle);
 211                                 pos = new HandleRef (this, IntPtr.Zero);
 212                         }
 213                 }
 214
 215                 public override string ToString ()
 216                 {
 217                         return "(" + base.ToString () + " " + GetDump () + ")";
 218                 }
 219
 220                 private string GetDump ()
 221                 {
 222                         if (FilePositionDumpSize <= 0)
 223                                 return "internal error";
 224
 225                         StringBuilder buf = new StringBuilder (FilePositionDumpSize+1);
 226
 227                         if (Stdlib.DumpFilePosition (buf, Handle, FilePositionDumpSize+1) <= 0)
 228                                 return "internal error dumping fpos_t";
 229
 230                         return buf.ToString ();
 231                 }
 232
 233                 public override bool Equals (object obj)
 234                 {
 235                         FilePosition fp = obj as FilePosition;
 236                         if (obj == null || fp == null)
 237                                 return false;
 238                         return ToString().Equals (obj.ToString());
 239                 }
 240
 241                 public bool Equals (FilePosition value)
 242                 {
 243                         if (object.ReferenceEquals (this, value))
 244                                 return true;
 245                         return ToString().Equals (value.ToString());
 246                 }
 247
 248                 public override int GetHashCode ()
 249                 {
 250                         return ToString ().GetHashCode ();
 251                 }
 252
 253                 ~FilePosition ()
 254                 {
 255                         Cleanup ();
 256                 }
 257
 258                 public static bool operator== (FilePosition lhs, FilePosition rhs)
 259                 {
 260                         return Object.Equals (lhs, rhs);
 261                 }
 262
 263                 public static bool operator!= (FilePosition lhs, FilePosition rhs)
 264                 {
 265                         return !Object.Equals (lhs, rhs);
 266                 }
 267         }
 268
 269
 270         public enum SignalAction {
 271                 Default,
 272                 Ignore,
 273                 Error
 274         }
 275
 276         //
 277         // Right now using this attribute gives an assert because it
 278         // isn't implemented.
 279         //
 280 #if NET_2_0 && UNMANAGED_FN_PTR_SUPPORT_FIXED
 281         [UnmanagedFunctionPointer (CallingConvention.Cdecl)]
 282 #endif
 283         public delegate void SignalHandler (int signal);
 284
 285 #if !NET_2_0
 286         internal sealed class SignalWrapper {
 287                 private IntPtr handler;
 288
 289                 internal SignalWrapper (IntPtr handler)
 290                 {
 291                         this.handler = handler;
 292                 }
 293
 294                 public void InvokeSignalHandler (int signum)
 295                 {
 296                         Stdlib.InvokeSignalHandler (signum, handler);
 297                 }
 298         }
 299 #endif
 300
 301         internal class XPrintfFunctions
 302         {
 303                 internal delegate object XPrintf (object[] parameters);
 304
 305                 internal static XPrintf printf;
 306                 internal static XPrintf fprintf;
 307                 internal static XPrintf snprintf;
 308                 internal static XPrintf syslog;
 309
 310                 static XPrintfFunctions ()
 311                 {
 312                         CdeclFunction _printf = new CdeclFunction (Stdlib.LIBC, "printf", typeof(int));
 313                         printf = new XPrintf (_printf.Invoke);
 314
 315                         CdeclFunction _fprintf = new CdeclFunction (Stdlib.LIBC, "fprintf", typeof(int));
 316                         fprintf = new XPrintf (_fprintf.Invoke);
 317
 318                         CdeclFunction _snprintf = new CdeclFunction (Stdlib.MPH,
 319                                         "Mono_Posix_Stdlib_snprintf", typeof(int));
 320                         snprintf = new XPrintf (_snprintf.Invoke);
 321
 322                         CdeclFunction _syslog = new CdeclFunction (Syscall.MPH,
 323                                         "Mono_Posix_Stdlib_syslog2", typeof(int));
 324                         syslog = new XPrintf (_syslog.Invoke);
 325                 }
 326         }
 327
 328         //
 329         // Convention: Functions that are part of the C standard library go here.
 330         //
 331         // For example, the man page should say something similar to:
 332         //
 333         //    CONFORMING TO
 334         //           ISO 9899 (''ANSI C'')
 335         //
 336         // The intent is that members of this class should be portable to any system
 337         // supporting the C runtime (read: non-Unix, including Windows).  Using
 338         // anything from Syscall is non-portable, but restricting yourself to just
 339         // Stdlib is intended to be portable.
 340         //
 341         // The only methods in here should be:
 342         //  (1) low-level functions (as defined above).
 343         //  (2) "Trivial" function overloads.  For example, if the parameters to a
 344         //      function are related (e.g. fwrite(3))
 345         //  (3) The return type SHOULD NOT be changed.  If you want to provide a
 346         //      convenience function with a nicer return type, place it into one of
 347         //      the Mono.Unix.Std* wrapper classes, and give it a .NET-styled name.
 348         //      - EXCEPTION: No public functions should have a `void' return type.
 349         //        `void' return types should be replaced with `int'.
 350         //        Rationality: `void'-return functions typically require a
 351         //        complicated call sequence, such as clear errno, then call, then
 352         //        check errno to see if any errors occurred.  This sequence can't
 353         //        be done safely in managed code, as errno may change as part of
 354         //        the P/Invoke mechanism.
 355         //        Instead, add a MonoPosixHelper export which does:
 356         //          errno = 0;
 357         //          INVOKE SYSCALL;
 358         //          return errno == 0 ? 0 : -1;
 359         //        This lets managed code check the return value in the usual manner.
 360         //  (4) Exceptions SHOULD NOT be thrown.  EXCEPTIONS:
 361         //      - If you're wrapping *broken* methods which make assumptions about
 362         //        input data, such as that an argument refers to N bytes of data.
 363         //        This is currently limited to cuserid(3) and encrypt(3).
 364         //      - If you call functions which themselves generate exceptions.
 365         //        This is the case for using NativeConvert, which will throw an
 366         //        exception if an invalid/unsupported value is used.
 367         //
 368         public class Stdlib
 369         {
 370                 internal const string LIBC = "msvcrt";
 371                 internal const string MPH  = "MonoPosixHelper";
 372
 373                 internal Stdlib () {}
 374
 375                 #region <errno.h> Declarations
 376                 //
 377                 // <errno.h>  -- COMPLETE
 378                 //
 379
 380                 public static Errno GetLastError ()
 381                 {
 382                         int errno = Marshal.GetLastWin32Error ();
 383                         return NativeConvert.ToErrno (errno);
 384                 }
 385
 386                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 387                                 EntryPoint="Mono_Posix_Stdlib_SetLastError")]
 388                 private static extern void SetLastError (int error);
 389
 390                 protected static void SetLastError (Errno error)
 391                 {
 392                         int _error = NativeConvert.FromErrno (error);
 393                         SetLastError (_error);
 394                 }
 395
 396                 #endregion
 397
 398                 //
 399                 // <signal.h>
 400                 //
 401                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 402                                 EntryPoint="Mono_Posix_Stdlib_InvokeSignalHandler")]
 403                 internal static extern void InvokeSignalHandler (int signum, IntPtr handler);
 404
 405                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 406                                 EntryPoint="Mono_Posix_Stdlib_SIG_DFL")]
 407                 private static extern IntPtr GetDefaultSignal ();
 408
 409                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 410                                 EntryPoint="Mono_Posix_Stdlib_SIG_ERR")]
 411                 private static extern IntPtr GetErrorSignal ();
 412
 413                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 414                                 EntryPoint="Mono_Posix_Stdlib_SIG_IGN")]
 415                 private static extern IntPtr GetIgnoreSignal ();
 416
 417                 private static readonly IntPtr _SIG_DFL = GetDefaultSignal ();
 418                 private static readonly IntPtr _SIG_ERR = GetErrorSignal ();
 419                 private static readonly IntPtr _SIG_IGN = GetIgnoreSignal ();
 420
 421                 private static void _ErrorHandler (int signum)
 422                 {
 423                         Console.Error.WriteLine ("Error handler invoked for signum " +
 424                                         signum + ".  Don't do that.");
 425                 }
 426
 427                 private static void _DefaultHandler (int signum)
 428                 {
 429                         Console.Error.WriteLine ("Default handler invoked for signum " +
 430                                         signum + ".  Don't do that.");
 431                 }
 432
 433                 private static void _IgnoreHandler (int signum)
 434                 {
 435                         Console.Error.WriteLine ("Ignore handler invoked for signum " +
 436                                         signum + ".  Don't do that.");
 437                 }
 438
 439                 [CLSCompliant (false)]
 440                 public static readonly SignalHandler SIG_DFL = new SignalHandler (_DefaultHandler);
 441                 [CLSCompliant (false)]
 442                 public static readonly SignalHandler SIG_ERR = new SignalHandler (_ErrorHandler);
 443                 [CLSCompliant (false)]
 444                 public static readonly SignalHandler SIG_IGN = new SignalHandler (_IgnoreHandler);
 445
 446                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl,
 447                                 SetLastError=true, EntryPoint="signal")]
 448                 private static extern IntPtr sys_signal (int signum, SignalHandler handler);
 449
 450                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl,
 451                                 SetLastError=true, EntryPoint="signal")]
 452                 private static extern IntPtr sys_signal (int signum, IntPtr handler);
 453
 454                 [CLSCompliant (false)]
 455                 [Obsolete ("This is not safe; " +
 456                                 "use Mono.Unix.UnixSignal for signal delivery or SetSignalAction()")]
 457                 public static SignalHandler signal (Signum signum, SignalHandler handler)
 458                 {
 459                         int _sig = NativeConvert.FromSignum (signum);
 460
 461                         Delegate[] handlers = handler.GetInvocationList ();
 462                         for (int i = 0; i < handlers.Length; ++i) {
 463                                 Marshal.Prelink (handlers [i].Method);
 464                         }
 465
 466                         IntPtr r;
 467                         if (handler == SIG_DFL)
 468                                 r = sys_signal (_sig, _SIG_DFL);
 469                         else if (handler == SIG_ERR)
 470                                 r = sys_signal (_sig, _SIG_ERR);
 471                         else if (handler == SIG_IGN)
 472                                 r = sys_signal (_sig, _SIG_IGN);
 473                         else
 474                                 r = sys_signal (_sig, handler);
 475                         return TranslateHandler (r);
 476                 }
 477
 478                 private static SignalHandler TranslateHandler (IntPtr handler)
 479                 {
 480                         if (handler == _SIG_DFL)
 481                                 return SIG_DFL;
 482                         if (handler == _SIG_ERR)
 483                                 return SIG_ERR;
 484                         if (handler == _SIG_IGN)
 485                                 return SIG_IGN;
 486 #if NET_2_0
 487                         return (SignalHandler) Marshal.GetDelegateForFunctionPointer (handler, typeof(SignalHandler));
 488 #else
 489                         return new SignalHandler (new SignalWrapper (handler).InvokeSignalHandler);
 490 #endif
 491                 }
 492
 493                 public static int SetSignalAction (Signum signal, SignalAction action)
 494                 {
 495                         return SetSignalAction (NativeConvert.FromSignum (signal), action);
 496                 }
 497
 498                 public static int SetSignalAction (RealTimeSignum rts, SignalAction action)
 499                 {
 500                         return SetSignalAction (NativeConvert.FromRealTimeSignum (rts), action);
 501                 }
 502
 503                 private static int SetSignalAction (int signum, SignalAction action)
 504                 {
 505                         IntPtr handler = IntPtr.Zero;
 506                         switch (action) {
 507                                 case SignalAction.Default:
 508                                         handler = _SIG_DFL;
 509                                         break;
 510                                 case SignalAction.Ignore:
 511                                         handler = _SIG_IGN;
 512                                         break;
 513                                 case SignalAction.Error:
 514                                         handler = _SIG_ERR;
 515                                         break;
 516                                 default:
 517                                         throw new ArgumentException ("Invalid action value.", "action");
 518                         }
 519                         IntPtr r = sys_signal (signum, handler);
 520                         if (r == _SIG_ERR)
 521                                 return -1;
 522                         return 0;
 523                 }
 524
 525                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, EntryPoint="raise")]
 526                 private static extern int sys_raise (int sig);
 527
 528                 [CLSCompliant (false)]
 529                 public static int raise (Signum sig)
 530                 {
 531                         return sys_raise (NativeConvert.FromSignum (sig));
 532                 }
 533
 534                 public static int raise (RealTimeSignum rts)
 535                 {
 536                         return sys_raise (NativeConvert.FromRealTimeSignum (rts));
 537                 }
 538
 539                 //
 540                 // <stdio.h> -- COMPLETE except for :
 541                 //    - the scanf(3) family .
 542                 //    - vararg functions.
 543                 //    - Horribly unsafe functions (gets(3)).
 544                 //
 545                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 546                                 EntryPoint="Mono_Posix_Stdlib__IOFBF")]
 547                 private static extern int GetFullyBuffered ();
 548
 549                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 550                                 EntryPoint="Mono_Posix_Stdlib__IOLBF")]
 551                 private static extern int GetLineBuffered ();
 552
 553                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 554                                 EntryPoint="Mono_Posix_Stdlib__IONBF")]
 555                 private static extern int GetNonBuffered ();
 556
 557                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 558                                 EntryPoint="Mono_Posix_Stdlib_BUFSIZ")]
 559                 private static extern int GetBufferSize ();
 560
 561                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 562                                 EntryPoint="Mono_Posix_Stdlib_CreateFilePosition")]
 563                 internal static extern IntPtr CreateFilePosition ();
 564
 565                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 566                                 EntryPoint="Mono_Posix_Stdlib_DumpFilePosition")]
 567                 internal static extern int DumpFilePosition (StringBuilder buf, HandleRef handle, int len);
 568
 569                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 570                                 EntryPoint="Mono_Posix_Stdlib_EOF")]
 571                 private static extern int GetEOF ();
 572
 573                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 574                                 EntryPoint="Mono_Posix_Stdlib_FILENAME_MAX")]
 575                 private static extern int GetFilenameMax ();
 576
 577                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 578                                 EntryPoint="Mono_Posix_Stdlib_FOPEN_MAX")]
 579                 private static extern int GetFopenMax ();
 580
 581                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 582                                 EntryPoint="Mono_Posix_Stdlib_L_tmpnam")]
 583                 private static extern int GetTmpnamLength ();
 584
 585                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 586                                 EntryPoint="Mono_Posix_Stdlib_stdin")]
 587                 private static extern IntPtr GetStandardInput ();
 588
 589                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 590                                 EntryPoint="Mono_Posix_Stdlib_stdout")]
 591                 private static extern IntPtr GetStandardOutput ();
 592
 593                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 594                                 EntryPoint="Mono_Posix_Stdlib_stderr")]
 595                 private static extern IntPtr GetStandardError ();
 596
 597                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 598                                 EntryPoint="Mono_Posix_Stdlib_TMP_MAX")]
 599                 private static extern int GetTmpMax ();
 600
 601                 [CLSCompliant (false)]
 602                 public static readonly int    _IOFBF       = GetFullyBuffered ();
 603                 [CLSCompliant (false)]
 604                 public static readonly int    _IOLBF       = GetLineBuffered ();
 605                 [CLSCompliant (false)]
 606                 public static readonly int    _IONBF       = GetNonBuffered ();
 607                 [CLSCompliant (false)]
 608                 public static readonly int    BUFSIZ       = GetBufferSize ();
 609                 [CLSCompliant (false)]
 610                 public static readonly int    EOF          = GetEOF ();
 611                 [CLSCompliant (false)]
 612                 public static readonly int    FOPEN_MAX    = GetFopenMax ();
 613                 [CLSCompliant (false)]
 614                 public static readonly int    FILENAME_MAX = GetFilenameMax ();
 615                 [CLSCompliant (false)]
 616                 public static readonly int    L_tmpnam     = GetTmpnamLength ();
 617                 public static readonly IntPtr stderr       = GetStandardError ();
 618                 public static readonly IntPtr stdin        = GetStandardInput ();
 619                 public static readonly IntPtr stdout       = GetStandardOutput ();
 620                 [CLSCompliant (false)]
 621                 public static readonly int    TMP_MAX      = GetTmpMax ();
 622
 623                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 624                 public static extern int remove (
 625                                 [MarshalAs (UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(FileNameMarshaler))]
 626                                 string filename);
 627
 628                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 629                 public static extern int rename (
 630                                 [MarshalAs (UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(FileNameMarshaler))]
 631                                 string oldpath,
 632                                 [MarshalAs (UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(FileNameMarshaler))]
 633                                 string newpath);
 634
 635                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 636                 public static extern IntPtr tmpfile ();
 637
 638                 private static object tmpnam_lock = new object ();
 639
 640                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl,
 641                                 SetLastError=true, EntryPoint="tmpnam")]
 642                 private static extern IntPtr sys_tmpnam (StringBuilder s);
 643
 644                 [Obsolete ("Syscall.mkstemp() should be preferred.")]
 645                 public static string tmpnam (StringBuilder s)
 646                 {
 647                         if (s != null && s.Capacity < L_tmpnam)
 648                                 throw new ArgumentOutOfRangeException ("s", "s.Capacity < L_tmpnam");
 649                         lock (tmpnam_lock) {
 650                                 IntPtr r = sys_tmpnam (s);
 651                                 return UnixMarshal.PtrToString (r);
 652                         }
 653                 }
 654
 655                 [Obsolete ("Syscall.mkstemp() should be preferred.")]
 656                 public static string tmpnam ()
 657                 {
 658                         lock (tmpnam_lock) {
 659                                 IntPtr r = sys_tmpnam (null);
 660                                 return UnixMarshal.PtrToString (r);
 661                         }
 662                 }
 663
 664                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 665                 public static extern int fclose (IntPtr stream);
 666
 667                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 668                 public static extern int fflush (IntPtr stream);
 669
 670                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 671                 public static extern IntPtr fopen (
 672                                 [MarshalAs (UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(FileNameMarshaler))]
 673                                 string path, string mode);
 674
 675                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 676                 public static extern IntPtr freopen (
 677                                 [MarshalAs (UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(FileNameMarshaler))]
 678                                 string path, string mode, IntPtr stream);
 679
 680                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 681                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_setbuf")]
 682                 public static extern int setbuf (IntPtr stream, IntPtr buf);
 683
 684                 [CLSCompliant (false)]
 685                 public static unsafe int setbuf (IntPtr stream, byte* buf)
 686                 {
 687                         return setbuf (stream, (IntPtr) buf);
 688                 }
 689
 690                 [CLSCompliant (false)]
 691                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 692                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_setvbuf")]
 693                 public static extern int setvbuf (IntPtr stream, IntPtr buf, int mode, ulong size);
 694
 695                 [CLSCompliant (false)]
 696                 public static unsafe int setvbuf (IntPtr stream, byte* buf, int mode, ulong size)
 697                 {
 698                         return setvbuf (stream, (IntPtr) buf, mode, size);
 699                 }
 700
 701                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl,
 702                                 EntryPoint="fprintf")]
 703                 private static extern int sys_fprintf (IntPtr stream, string format, string message);
 704
 705                 public static int fprintf (IntPtr stream, string message)
 706                 {
 707                         return sys_fprintf (stream, "%s", message);
 708                 }
 709
 710                 [Obsolete ("Not necessarily portable due to cdecl restrictions.\n" +
 711                                 "Use fprintf (IntPtr, string) instead.")]
 712                 public static int fprintf (IntPtr stream, string format, params object[] parameters)
 713                 {
 714                         object[] _parameters = new object[checked(parameters.Length+2)];
 715                         _parameters [0] = stream;
 716                         _parameters [1] = format;
 717                         Array.Copy (parameters, 0, _parameters, 2, parameters.Length);
 718                         return (int) XPrintfFunctions.fprintf (_parameters);
 719                 }
 720
 721                 /* SKIP: fscanf(3) */
 722
 723                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl,
 724                                 EntryPoint="printf")]
 725                 private static extern int sys_printf (string format, string message);
 726
 727                 public static int printf (string message)
 728                 {
 729                         return sys_printf ("%s", message);
 730                 }
 731
 732                 [Obsolete ("Not necessarily portable due to cdecl restrictions.\n" +
 733                                 "Use printf (string) instead.")]
 734                 public static int printf (string format, params object[] parameters)
 735                 {
 736                         object[] _parameters = new object[checked(parameters.Length+1)];
 737                         _parameters [0] = format;
 738                         Array.Copy (parameters, 0, _parameters, 1, parameters.Length);
 739                         return (int) XPrintfFunctions.printf (_parameters);
 740                 }
 741
 742                 /* SKIP: scanf(3) */
 743
 744                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 745                                 EntryPoint="Mono_Posix_Stdlib_snprintf")]
 746                 private static extern int sys_snprintf (StringBuilder s, ulong n,
 747                                 string format, string message);
 748
 749                 [CLSCompliant (false)]
 750                 public static int snprintf (StringBuilder s, ulong n, string message)
 751                 {
 752                         if (n > (ulong) s.Capacity)
 753                                 throw new ArgumentOutOfRangeException ("n", "n must be <= s.Capacity");
 754                         return sys_snprintf (s, n, "%s", message);
 755                 }
 756
 757                 public static int snprintf (StringBuilder s, string message)
 758                 {
 759                         return sys_snprintf (s, (ulong) s.Capacity, "%s", message);
 760                 }
 761
 762                 [CLSCompliant (false)]
 763                 [Obsolete ("Not necessarily portable due to cdecl restrictions.\n" +
 764                                 "Use snprintf (StringBuilder, string) instead.")]
 765                 public static int snprintf (StringBuilder s, ulong n,
 766                                 string format, params object[] parameters)
 767                 {
 768                         if (n > (ulong) s.Capacity)
 769                                 throw new ArgumentOutOfRangeException ("n", "n must be <= s.Capacity");
 770
 771                         object[] _parameters = new object[checked(parameters.Length+3)];
 772                         _parameters [0] = s;
 773                         _parameters [1] = n;
 774                         _parameters [2] = format;
 775                         Array.Copy (parameters, 0, _parameters, 3, parameters.Length);
 776                         return (int) XPrintfFunctions.snprintf (_parameters);
 777                 }
 778
 779                 [CLSCompliant (false)]
 780                 [Obsolete ("Not necessarily portable due to cdecl restrictions.\n" +
 781                                 "Use snprintf (StringBuilder, string) instead.")]
 782                 public static int snprintf (StringBuilder s,
 783                                 string format, params object[] parameters)
 784                 {
 785                         object[] _parameters = new object[checked(parameters.Length+3)];
 786                         _parameters [0] = s;
 787                         _parameters [1] = (ulong) s.Capacity;
 788                         _parameters [2] = format;
 789                         Array.Copy (parameters, 0, _parameters, 3, parameters.Length);
 790                         return (int) XPrintfFunctions.snprintf (_parameters);
 791                 }
 792
 793                 /*
 794                  * SKIP:
 795                  *    sprintf(3)
 796                  *    sscanf(3)
 797                  *    vfprintf(3)
 798                  *    vfscanf(3)
 799                  *    vprintf(3)
 800                  *    vscanf(3)
 801                  *    vsnprintf(3)
 802                  *    vsprint(3)
 803                  *    vsscanf(3)
 804                  */
 805
 806                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 807                 public static extern int fgetc (IntPtr stream);
 808
 809                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl,
 810                                 SetLastError=true, EntryPoint="fgets")]
 811                 private static extern IntPtr sys_fgets (StringBuilder sb, int size, IntPtr stream);
 812
 813                 public static StringBuilder fgets (StringBuilder sb, int size, IntPtr stream)
 814                 {
 815                         IntPtr r = sys_fgets (sb, size, stream);
 816                         if (r == IntPtr.Zero)
 817                                 return null;
 818                         return sb;
 819                 }
 820
 821                 public static StringBuilder fgets (StringBuilder sb, IntPtr stream)
 822                 {
 823                         return fgets (sb, sb.Capacity, stream);
 824                 }
 825
 826                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 827                 public static extern int fputc (int c, IntPtr stream);
 828
 829                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 830                 public static extern int fputs (string s, IntPtr stream);
 831
 832                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 833                 public static extern int getc (IntPtr stream);
 834
 835                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 836                 public static extern int getchar ();
 837
 838                 /* SKIP: gets(3) */
 839
 840                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 841                 public static extern int putc (int c, IntPtr stream);
 842
 843                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 844                 public static extern int putchar (int c);
 845
 846                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 847                 public static extern int puts (string s);
 848
 849                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
 850                 public static extern int ungetc (int c, IntPtr stream);
 851
 852                 [CLSCompliant (false)]
 853                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 854                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_fread")]
 855                 public static extern ulong fread (IntPtr ptr, ulong size, ulong nmemb, IntPtr stream);
 856
 857                 [CLSCompliant (false)]
 858                 public static unsafe ulong fread (void* ptr, ulong size, ulong nmemb, IntPtr stream)
 859                 {
 860                         return fread ((IntPtr) ptr, size, nmemb, stream);
 861                 }
 862
 863                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 864                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_fread")]
 865                 private static extern ulong sys_fread ([Out] byte[] ptr,
 866                                 ulong size, ulong nmemb, IntPtr stream);
 867
 868                 [CLSCompliant (false)]
 869                 public static ulong fread (byte[] ptr, ulong size, ulong nmemb, IntPtr stream)
 870                 {
 871                         if ((size * nmemb) > (ulong) ptr.Length)
 872                                 throw new ArgumentOutOfRangeException ("nmemb");
 873                         return sys_fread (ptr, size, nmemb, stream);
 874                 }
 875
 876                 [CLSCompliant (false)]
 877                 public static ulong fread (byte[] ptr, IntPtr stream)
 878                 {
 879                         return fread (ptr, 1, (ulong) ptr.Length, stream);
 880                 }
 881
 882                 [CLSCompliant (false)]
 883                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 884                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_fwrite")]
 885                 public static extern ulong fwrite (IntPtr ptr, ulong size, ulong nmemb, IntPtr stream);
 886
 887                 [CLSCompliant (false)]
 888                 public static unsafe ulong fwrite (void* ptr, ulong size, ulong nmemb, IntPtr stream)
 889                 {
 890                         return fwrite ((IntPtr) ptr, size, nmemb, stream);
 891                 }
 892
 893                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 894                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_fwrite")]
 895                 private static extern ulong sys_fwrite (byte[] ptr,
 896                                 ulong size, ulong nmemb, IntPtr stream);
 897
 898                 [CLSCompliant (false)]
 899                 public static ulong fwrite (byte[] ptr, ulong size, ulong nmemb, IntPtr stream)
 900                 {
 901                         if ((size * nmemb) > (ulong) ptr.Length)
 902                                 throw new ArgumentOutOfRangeException ("nmemb");
 903                         return sys_fwrite (ptr, size, nmemb, stream);
 904                 }
 905
 906                 [CLSCompliant (false)]
 907                 public static ulong fwrite (byte[] ptr, IntPtr stream)
 908                 {
 909                         return fwrite (ptr, 1, (ulong) ptr.Length, stream);
 910                 }
 911
 912                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 913                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_fgetpos")]
 914                 private static extern int sys_fgetpos (IntPtr stream, HandleRef pos);
 915
 916                 public static int fgetpos (IntPtr stream, FilePosition pos)
 917                 {
 918                         return sys_fgetpos (stream, pos.Handle);
 919                 }
 920
 921                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 922                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_fseek")]
 923                 private static extern int sys_fseek (IntPtr stream, long offset, int origin);
 924
 925                 [CLSCompliant (false)]
 926                 public static int fseek (IntPtr stream, long offset, SeekFlags origin)
 927                 {
 928                         int _origin = NativeConvert.FromSeekFlags (origin);
 929                         return sys_fseek (stream, offset, _origin);
 930                 }
 931
 932                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 933                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_fsetpos")]
 934                 private static extern int sys_fsetpos (IntPtr stream, HandleRef pos);
 935
 936                 public static int fsetpos (IntPtr stream, FilePosition pos)
 937                 {
 938                         return sys_fsetpos (stream, pos.Handle);
 939                 }
 940
 941                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 942                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_ftell")]
 943                 public static extern long ftell (IntPtr stream);
 944
 945                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 946                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_rewind")]
 947                 public static extern int rewind (IntPtr stream);
 948
 949                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 950                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_clearerr")]
 951                 public static extern int clearerr (IntPtr stream);
 952
 953                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl)]
 954                 public static extern int feof (IntPtr stream);
 955
 956                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl)]
 957                 public static extern int ferror (IntPtr stream);
 958
 959                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 960                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_perror")]
 961                 private static extern int perror (string s, int err);
 962
 963                 public static int perror (string s)
 964                 {
 965                         return perror (s, Marshal.GetLastWin32Error ());
 966                 }
 967
 968                 //
 969                 // <stdlib.h>
 970                 //
 971                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 972                                 EntryPoint="Mono_Posix_Stdlib_EXIT_FAILURE")]
 973                 private static extern int GetExitFailure();
 974
 975                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 976                                 EntryPoint="Mono_Posix_Stdlib_EXIT_SUCCESS")]
 977                 private static extern int GetExitSuccess ();
 978
 979                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 980                                 EntryPoint="Mono_Posix_Stdlib_MB_CUR_MAX")]
 981                 private static extern int GetMbCurMax ();
 982
 983                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
 984                                 EntryPoint="Mono_Posix_Stdlib_RAND_MAX")]
 985                 private static extern int GetRandMax ();
 986
 987                 [CLSCompliant (false)]
 988                 public static readonly int  EXIT_FAILURE = GetExitFailure ();
 989                 [CLSCompliant (false)]
 990                 public static readonly int  EXIT_SUCCESS = GetExitSuccess ();
 991                 [CLSCompliant (false)]
 992                 public static readonly int  MB_CUR_MAX   = GetMbCurMax ();
 993                 [CLSCompliant (false)]
 994                 public static readonly int  RAND_MAX     = GetRandMax ();
 995
 996                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl)]
 997                 public static extern int rand ();
 998
 999                 [CLSCompliant (false)]
1000                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl)]
1001                 public static extern void srand (uint seed);
1002
1003                 // calloc(3):
1004                 //    void *calloc (size_t nmemb, size_t size);
1005                 [CLSCompliant (false)]
1006                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
1007                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_calloc")]
1008                 public static extern IntPtr calloc (ulong nmemb, ulong size);
1009
1010                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl)]
1011                 public static extern void free (IntPtr ptr);
1012
1013                 // malloc(3):
1014                 //    void *malloc(size_t size);
1015                 [CLSCompliant (false)]
1016                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
1017                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_malloc")]
1018                 public static extern IntPtr malloc (ulong size);
1019
1020                 // realloc(3):
1021                 //    void *realloc(void *ptr, size_t size);
1022                 [CLSCompliant (false)]
1023                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
1024                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_realloc")]
1025                 public static extern IntPtr realloc (IntPtr ptr, ulong size);
1026
1027                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl)]
1028                 public static extern void abort ();
1029
1030                 /* SKIP: atexit(3) -- the GC should have collected most references by the
1031                  * time this runs, so no delegates should exist, making it pointless. */
1032
1033                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl)]
1034                 public static extern void exit (int status);
1035
1036                 [CLSCompliant (false)]
1037                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl)]
1038                 public static extern void _Exit (int status);
1039
1040                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, EntryPoint="getenv")]
1041                 private static extern IntPtr sys_getenv (string name);
1042
1043                 public static string getenv (string name)
1044                 {
1045                         IntPtr r = sys_getenv (name);
1046                         return UnixMarshal.PtrToString (r);
1047                 }
1048
1049                 [CLSCompliant (false)]
1050                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl, SetLastError=true)]
1051                 public static extern int system (string @string);
1052
1053                 //
1054                 // <string.h>
1055                 //
1056
1057                 private static object strerror_lock = new object ();
1058
1059                 [DllImport (LIBC, CallingConvention=CallingConvention.Cdecl,
1060                                 SetLastError=true, EntryPoint="strerror")]
1061                 private static extern IntPtr sys_strerror (int errnum);
1062
1063                 [CLSCompliant (false)]
1064                 public static string strerror (Errno errnum)
1065                 {
1066                         int e = NativeConvert.FromErrno (errnum);
1067                         lock (strerror_lock) {
1068                                 IntPtr r = sys_strerror (e);
1069                                 return UnixMarshal.PtrToString (r);
1070                         }
1071                 }
1072
1073                 // strlen(3):
1074                 //    size_t strlen(const char *s);
1075                 [CLSCompliant (false)]
1076                 [DllImport (MPH, CallingConvention=CallingConvention.Cdecl,
1077                                 SetLastError=true, EntryPoint="Mono_Posix_Stdlib_strlen")]
1078                 public static extern ulong strlen (IntPtr s);
1079         }
1080
1081         #endregion // Classes
1082 }
1083
1084 // vim: noexpandtab