include/unistd.h

   1 /* Copyright (C) 1991-2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      POSIX Standard: 2.10 Symbolic Constants         <unistd.h>
  20  */
  21
  22 #ifndef _UNISTD_H
  23 #define _UNISTD_H       1
  24
  25 #include <features.h>
  26
  27 __BEGIN_DECLS
  28
  29 /* These may be used to determine what facilities are present at compile time.
  30    Their values can be obtained at run time from `sysconf'.  */
  31
  32 #ifdef __USE_XOPEN2K8
  33 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008.  */
  34 # define _POSIX_VERSION 200809L
  35 #elif defined __USE_XOPEN2K
  36 /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001.  */
  37 # define _POSIX_VERSION 200112L
  38 #elif defined __USE_POSIX199506
  39 /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995.  */
  40 # define _POSIX_VERSION 199506L
  41 #elif defined __USE_POSIX199309
  42 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993.  */
  43 # define _POSIX_VERSION 199309L
  44 #else
  45 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990.  */
  46 # define _POSIX_VERSION 199009L
  47 #endif
  48
  49 /* These are not #ifdef __USE_POSIX2 because they are
  50    in the theoretically application-owned namespace.  */
  51
  52 #ifdef __USE_XOPEN2K8
  53 # define __POSIX2_THIS_VERSION  200809L
  54 /* The utilities on GNU systems also correspond to this version.  */
  55 #elif defined __USE_XOPEN2K
  56 /* The utilities on GNU systems also correspond to this version.  */
  57 # define __POSIX2_THIS_VERSION  200112L
  58 #elif defined __USE_POSIX199506
  59 /* The utilities on GNU systems also correspond to this version.  */
  60 # define __POSIX2_THIS_VERSION  199506L
  61 #else
  62 /* The utilities on GNU systems also correspond to this version.  */
  63 # define __POSIX2_THIS_VERSION  199209L
  64 #endif
  65
  66 /* The utilities on GNU systems also correspond to this version.  */
  67 #define _POSIX2_VERSION __POSIX2_THIS_VERSION
  68
  69 /* If defined, the implementation supports the
  70    C Language Bindings Option.  */
  71 #define _POSIX2_C_BIND  __POSIX2_THIS_VERSION
  72
  73 /* If defined, the implementation supports the
  74    C Language Development Utilities Option.  */
  75 #define _POSIX2_C_DEV   __POSIX2_THIS_VERSION
  76
  77 /* If defined, the implementation supports the
  78    Software Development Utilities Option.  */
  79 #define _POSIX2_SW_DEV  __POSIX2_THIS_VERSION
  80
  81 #if 0 /* uClibc does not provide the utility */
  82 /* If defined, the implementation supports the
  83    creation of locales with the localedef utility.  */
  84 #define _POSIX2_LOCALEDEF       __POSIX2_THIS_VERSION
  85 #endif
  86
  87 /* X/Open version number to which the library conforms.  It is selectable.  */
  88 #ifdef __USE_XOPEN2K8
  89 # define _XOPEN_VERSION 700
  90 #elif defined __USE_XOPEN2K
  91 # define _XOPEN_VERSION 600
  92 #elif defined __USE_UNIX98
  93 # define _XOPEN_VERSION 500
  94 #else
  95 # define _XOPEN_VERSION 4
  96 #endif
  97
  98 /* Commands and utilities from XPG4 are available.  */
  99 #define _XOPEN_XCU_VERSION      4
 100
 101 /* We are compatible with the old published standards as well.  */
 102 #define _XOPEN_XPG2     1
 103 #define _XOPEN_XPG3     1
 104 #define _XOPEN_XPG4     1
 105
 106 /* The X/Open Unix extensions are available.  */
 107 #define _XOPEN_UNIX     1
 108
 109 /* Encryption is present.  */
 110 #define _XOPEN_CRYPT    1
 111
 112 /* The enhanced internationalization capabilities according to XPG4.2
 113    are present.  */
 114 #define _XOPEN_ENH_I18N 1
 115
 116 /* The legacy interfaces are also available.  */
 117 #define _XOPEN_LEGACY   1
 118
 119
 120 /* Get values of POSIX options:
 121
 122    If these symbols are defined, the corresponding features are
 123    always available.  If not, they may be available sometimes.
 124    The current values can be obtained with `sysconf'.
 125
 126    _POSIX_JOB_CONTROL           Job control is supported.
 127    _POSIX_SAVED_IDS             Processes have a saved set-user-ID
 128                                 and a saved set-group-ID.
 129    _POSIX_REALTIME_SIGNALS      Real-time, queued signals are supported.
 130    _POSIX_PRIORITY_SCHEDULING   Priority scheduling is supported.
 131    _POSIX_TIMERS                POSIX.4 clocks and timers are supported.
 132    _POSIX_ASYNCHRONOUS_IO       Asynchronous I/O is supported.
 133    _POSIX_PRIORITIZED_IO        Prioritized asynchronous I/O is supported.
 134    _POSIX_SYNCHRONIZED_IO       Synchronizing file data is supported.
 135    _POSIX_FSYNC                 The fsync function is present.
 136    _POSIX_MAPPED_FILES          Mapping of files to memory is supported.
 137    _POSIX_MEMLOCK               Locking of all memory is supported.
 138    _POSIX_MEMLOCK_RANGE         Locking of ranges of memory is supported.
 139    _POSIX_MEMORY_PROTECTION     Setting of memory protections is supported.
 140    _POSIX_MESSAGE_PASSING       POSIX.4 message queues are supported.
 141    _POSIX_SEMAPHORES            POSIX.4 counting semaphores are supported.
 142    _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
 143    _POSIX_THREADS               POSIX.1c pthreads are supported.
 144    _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
 145    _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
 146    _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
 147    _POSIX_THREAD_PRIORITY_SCHEDULING
 148                                 POSIX.1c thread execution scheduling supported.
 149    _POSIX_THREAD_PRIO_INHERIT   Thread priority inheritance option supported.
 150    _POSIX_THREAD_PRIO_PROTECT   Thread priority protection option supported.
 151    _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
 152    _POSIX_PII                   Protocol-independent interfaces are supported.
 153    _POSIX_PII_XTI               XTI protocol-indep. interfaces are supported.
 154    _POSIX_PII_SOCKET            Socket protocol-indep. interfaces are supported.
 155    _POSIX_PII_INTERNET          Internet family of protocols supported.
 156    _POSIX_PII_INTERNET_STREAM   Connection-mode Internet protocol supported.
 157    _POSIX_PII_INTERNET_DGRAM    Connectionless Internet protocol supported.
 158    _POSIX_PII_OSI               ISO/OSI family of protocols supported.
 159    _POSIX_PII_OSI_COTS          Connection-mode ISO/OSI service supported.
 160    _POSIX_PII_OSI_CLTS          Connectionless ISO/OSI service supported.
 161    _POSIX_POLL                  Implementation supports `poll' function.
 162    _POSIX_SELECT                Implementation supports `select' and `pselect'.
 163
 164    _XOPEN_REALTIME              X/Open realtime support is available.
 165    _XOPEN_REALTIME_THREADS      X/Open realtime thread support is available.
 166    _XOPEN_SHM                   Shared memory interface according to XPG4.2.
 167
 168    _XBS5_ILP32_OFF32            Implementation provides environment with 32-bit
 169                                 int, long, pointer, and off_t types.
 170    _XBS5_ILP32_OFFBIG           Implementation provides environment with 32-bit
 171                                 int, long, and pointer and off_t with at least
 172                                 64 bits.
 173    _XBS5_LP64_OFF64             Implementation provides environment with 32-bit
 174                                 int, and 64-bit long, pointer, and off_t types.
 175    _XBS5_LPBIG_OFFBIG           Implementation provides environment with at
 176                                 least 32 bits int and long, pointer, and off_t
 177                                 with at least 64 bits.
 178
 179    If any of these symbols is defined as -1, the corresponding option is not
 180    true for any file.  If any is defined as other than -1, the corresponding
 181    option is true for all files.  If a symbol is not defined at all, the value
 182    for a specific file can be obtained from `pathconf' and `fpathconf'.
 183
 184    _POSIX_CHOWN_RESTRICTED      Only the super user can use `chown' to change
 185                                 the owner of a file.  `chown' can only be used
 186                                 to change the group ID of a file to a group of
 187                                 which the calling process is a member.
 188    _POSIX_NO_TRUNC              Pathname components longer than
 189                                 NAME_MAX generate an error.
 190    _POSIX_VDISABLE              If defined, if the value of an element of the
 191                                 `c_cc' member of `struct termios' is
 192                                 _POSIX_VDISABLE, no character will have the
 193                                 effect associated with that element.
 194    _POSIX_SYNC_IO               Synchronous I/O may be performed.
 195    _POSIX_ASYNC_IO              Asynchronous I/O may be performed.
 196    _POSIX_PRIO_IO               Prioritized Asynchronous I/O may be performed.
 197
 198    Support for the Large File Support interface is not generally available.
 199    If it is available the following constants are defined to one.
 200    _LFS64_LARGEFILE             Low-level I/O supports large files.
 201    _LFS64_STDIO                 Standard I/O supports large files.
 202    */
 203
 204 #include <bits/posix_opt.h>
 205 /* keep it after posix_opt.h, it overwrites based on uClibc's config options */
 206 #include <bits/uClibc_posix_opt.h>
 207
 208 /* Get the environment definitions from Unix98.  */
 209 #if defined __USE_UNIX98 || defined __USE_XOPEN2K
 210 # include <bits/environments.h>
 211 #endif
 212
 213 /* Standard file descriptors.  */
 214 #define STDIN_FILENO    0       /* Standard input.  */
 215 #define STDOUT_FILENO   1       /* Standard output.  */
 216 #define STDERR_FILENO   2       /* Standard error output.  */
 217
 218
 219 /* All functions that are not declared anywhere else.  */
 220
 221 #include <bits/types.h>
 222
 223 #ifndef __ssize_t_defined
 224 typedef __ssize_t ssize_t;
 225 # define __ssize_t_defined
 226 #endif
 227
 228 #define __need_size_t
 229 #define __need_NULL
 230 #include <stddef.h>
 231
 232 #if defined __USE_XOPEN || defined __USE_XOPEN2K
 233 /* The Single Unix specification says that some more types are
 234    available here.  */
 235 # ifndef __gid_t_defined
 236 typedef __gid_t gid_t;
 237 #  define __gid_t_defined
 238 # endif
 239
 240 # ifndef __uid_t_defined
 241 typedef __uid_t uid_t;
 242 #  define __uid_t_defined
 243 # endif
 244
 245 # ifndef __off_t_defined
 246 #  ifndef __USE_FILE_OFFSET64
 247 typedef __off_t off_t;
 248 #  else
 249 typedef __off64_t off_t;
 250 #  endif
 251 #  define __off_t_defined
 252 # endif
 253 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
 254 typedef __off64_t off64_t;
 255 #  define __off64_t_defined
 256 # endif
 257
 258 # ifndef __useconds_t_defined
 259 typedef __useconds_t useconds_t;
 260 #  define __useconds_t_defined
 261 # endif
 262
 263 # ifndef __pid_t_defined
 264 typedef __pid_t pid_t;
 265 #  define __pid_t_defined
 266 # endif
 267 #endif  /* X/Open */
 268
 269 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 270 # ifndef __intptr_t_defined
 271 typedef __intptr_t intptr_t;
 272 #  define __intptr_t_defined
 273 # endif
 274 #endif
 275
 276 #if defined __USE_BSD || defined __USE_XOPEN
 277 # ifndef __socklen_t_defined
 278 typedef __socklen_t socklen_t;
 279 #  define __socklen_t_defined
 280 # endif
 281 #endif
 282
 283 /* Values for the second argument to access.
 284    These may be OR'd together.  */
 285 #define R_OK    4               /* Test for read permission.  */
 286 #define W_OK    2               /* Test for write permission.  */
 287 #define X_OK    1               /* Test for execute permission.  */
 288 #define F_OK    0               /* Test for existence.  */
 289
 290 /* Test for access to NAME using the real UID and real GID.  */
 291 extern int access (const char *__name, int __type) __THROW __nonnull ((1));
 292
 293 #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
 294 /* Test for access to NAME using the effective UID and GID
 295    (as normal file operations use).  */
 296 extern int euidaccess (const char *__name, int __type)
 297      __THROW __nonnull ((1));
 298
 299 /* An alias for `euidaccess', used by some other systems.  */
 300 extern int eaccess (const char *__name, int __type)
 301      __THROW __nonnull ((1));
 302 #endif
 303
 304 #ifdef __USE_ATFILE
 305 /* Test for access to FILE relative to the directory FD is open on.
 306    If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess',
 307    otherwise use real IDs like `access'.  */
 308 extern int faccessat (int __fd, const char *__file, int __type, int __flag)
 309      __THROW __nonnull ((2)) __wur;
 310 libc_hidden_proto(faccessat)
 311 #endif /* Use GNU.  */
 312
 313
 314 /* Values for the WHENCE argument to lseek.  */
 315 #ifndef _STDIO_H                /* <stdio.h> has the same definitions.  */
 316 # define SEEK_SET       0       /* Seek from beginning of file.  */
 317 # define SEEK_CUR       1       /* Seek from current position.  */
 318 # define SEEK_END       2       /* Seek from end of file.  */
 319 # ifdef __USE_GNU
 320 #  define SEEK_DATA     3       /* Seek to next data.  */
 321 #  define SEEK_HOLE     4       /* Seek to next hole.  */
 322 # endif
 323 #endif
 324
 325 #if defined __USE_BSD && !defined L_SET
 326 /* Old BSD names for the same constants; just for compatibility.  */
 327 # define L_SET          SEEK_SET
 328 # define L_INCR         SEEK_CUR
 329 # define L_XTND         SEEK_END
 330 #endif
 331
 332
 333 /* Move FD's file position to OFFSET bytes from the
 334    beginning of the file (if WHENCE is SEEK_SET),
 335    the current position (if WHENCE is SEEK_CUR),
 336    or the end of the file (if WHENCE is SEEK_END).
 337    Return the new file position.  */
 338 #ifndef __USE_FILE_OFFSET64
 339 extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;
 340 # ifdef _LIBC
 341 extern __typeof(lseek) __lseek_nocancel attribute_hidden;
 342 libc_hidden_proto(lseek)
 343 # endif
 344 #else
 345 # ifdef __REDIRECT_NTH
 346 extern __off64_t __REDIRECT_NTH (lseek,
 347                                  (int __fd, __off64_t __offset, int __whence),
 348                                  lseek64);
 349 # else
 350 #  define lseek lseek64
 351 # endif
 352 #endif
 353 #ifdef __USE_LARGEFILE64
 354 extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
 355      __THROW;
 356 # ifdef _LIBC
 357 extern __typeof(lseek64) __lseek64_nocancel attribute_hidden;
 358 libc_hidden_proto(lseek64)
 359 # endif
 360 #endif
 361
 362 /* Close the file descriptor FD.
 363
 364    This function is a cancellation point and therefore not marked with
 365    __THROW.  */
 366 extern int close (int __fd);
 367 #ifdef _LIBC
 368 extern __typeof(close) __close_nocancel attribute_hidden;
 369 extern void __close_nocancel_no_status(int) attribute_hidden;
 370 libc_hidden_proto(close)
 371 #endif
 372
 373 /* Read NBYTES into BUF from FD.  Return the
 374    number read, -1 for errors or 0 for EOF.
 375
 376    This function is a cancellation point and therefore not marked with
 377    __THROW.  */
 378 extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;
 379 #ifdef _LIBC
 380 extern __typeof(read) __read_nocancel attribute_hidden;
 381 libc_hidden_proto(read)
 382 #endif
 383
 384 /* Write N bytes of BUF to FD.  Return the number written, or -1.
 385
 386    This function is a cancellation point and therefore not marked with
 387    __THROW.  */
 388 extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur;
 389 #ifdef _LIBC
 390 extern __typeof(write) __write_nocancel attribute_hidden;
 391 libc_hidden_proto(write)
 392 #endif
 393
 394 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8
 395 # ifndef __USE_FILE_OFFSET64
 396 /* Read NBYTES into BUF from FD at the given position OFFSET without
 397    changing the file pointer.  Return the number read, -1 for errors
 398    or 0 for EOF.
 399
 400    This function is a cancellation point and therefore not marked with
 401    __THROW.  */
 402 extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
 403                       __off_t __offset) __wur;
 404
 405 /* Write N bytes of BUF to FD at the given position OFFSET without
 406    changing the file pointer.  Return the number written, or -1.
 407
 408    This function is a cancellation point and therefore not marked with
 409    __THROW.  */
 410 extern ssize_t pwrite (int __fd, const void *__buf, size_t __n,
 411                        __off_t __offset) __wur;
 412 # else
 413 #  ifdef __REDIRECT
 414 extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
 415                                    __off64_t __offset),
 416                            pread64) __wur;
 417 extern ssize_t __REDIRECT (pwrite, (int __fd, const void *__buf,
 418                                     size_t __nbytes, __off64_t __offset),
 419                            pwrite64) __wur;
 420 #  else
 421 #   define pread pread64
 422 #   define pwrite pwrite64
 423 #  endif
 424 # endif
 425
 426 # ifdef __USE_LARGEFILE64
 427 /* Read NBYTES into BUF from FD at the given position OFFSET without
 428    changing the file pointer.  Return the number read, -1 for errors
 429    or 0 for EOF.  */
 430 extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
 431                         __off64_t __offset) __wur;
 432 /* Write N bytes of BUF to FD at the given position OFFSET without
 433    changing the file pointer.  Return the number written, or -1.  */
 434 extern ssize_t pwrite64 (int __fd, const void *__buf, size_t __n,
 435                          __off64_t __offset) __wur;
 436 # endif
 437 #endif
 438
 439 /* Create a one-way communication channel (pipe).
 440    If successful, two file descriptors are stored in PIPEDES;
 441    bytes written on PIPEDES[1] can be read from PIPEDES[0].
 442    Returns 0 if successful, -1 if not.  */
 443 extern int pipe (int __pipedes[2]) __THROW __wur;
 444 libc_hidden_proto(pipe)
 445
 446 #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
 447 /* Same as pipe but apply flags passed in FLAGS to the new file
 448    descriptors.  */
 449 extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;
 450 libc_hidden_proto(pipe2)
 451 #endif
 452
 453 /* Schedule an alarm.  In SECONDS seconds, the process will get a SIGALRM.
 454    If SECONDS is zero, any currently scheduled alarm will be cancelled.
 455    The function returns the number of seconds remaining until the last
 456    alarm scheduled would have signaled, or zero if there wasn't one.
 457    There is no return value to indicate an error, but you can set `errno'
 458    to 0 and check its value after calling `alarm', and this might tell you.
 459    The signal may come late due to processor scheduling.  */
 460 extern unsigned int alarm (unsigned int __seconds) __THROW;
 461 libc_hidden_proto(alarm)
 462
 463 /* Make the process sleep for SECONDS seconds, or until a signal arrives
 464    and is not ignored.  The function returns the number of seconds less
 465    than SECONDS which it actually slept (thus zero if it slept the full time).
 466    If a signal handler does a `longjmp' or modifies the handling of the
 467    SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
 468    signal afterwards is undefined.  There is no return value to indicate
 469    error, but if `sleep' returns SECONDS, it probably didn't work.
 470
 471    This function is a cancellation point and therefore not marked with
 472    __THROW.  */
 473 extern unsigned int sleep (unsigned int __seconds);
 474 libc_hidden_proto(sleep)
 475
 476 #if (defined __USE_BSD \
 477                 || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
 478         ) && defined __UCLIBC_SUSV3_LEGACY__
 479 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
 480    microseconds.  If INTERVAL is nonzero, when the alarm goes off, the
 481    timer is reset to go off every INTERVAL microseconds thereafter.
 482    Returns the number of microseconds remaining before the alarm.  */
 483 extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)
 484      __THROW;
 485
 486 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
 487    or ignored.
 488
 489    This function is a cancellation point and therefore not marked with
 490    __THROW.  */
 491 extern int usleep (__useconds_t __useconds);
 492 #endif
 493
 494
 495 /* Suspend the process until a signal arrives.
 496    This always returns -1 and sets `errno' to EINTR.
 497
 498    This function is a cancellation point and therefore not marked with
 499    __THROW.  */
 500 extern int pause (void);
 501
 502
 503 /* Change the owner and group of FILE.  */
 504 extern int chown (const char *__file, __uid_t __owner, __gid_t __group)
 505      __THROW __nonnull ((1)) __wur;
 506 libc_hidden_proto(chown)
 507
 508 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
 509 /* Change the owner and group of the file that FD is open on.  */
 510 extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;
 511
 512
 513 /* Change owner and group of FILE, if it is a symbolic
 514    link the ownership of the symbolic link is changed.  */
 515 extern int lchown (const char *__file, __uid_t __owner, __gid_t __group)
 516      __THROW __nonnull ((1)) __wur;
 517
 518 #endif /* Use BSD || X/Open Unix.  */
 519
 520 #ifdef __USE_ATFILE
 521 /* Change the owner and group of FILE relative to the directory FD is open
 522    on.  */
 523 extern int fchownat (int __fd, const char *__file, __uid_t __owner,
 524                      __gid_t __group, int __flag)
 525      __THROW __nonnull ((2)) __wur;
 526 libc_hidden_proto(fchownat)
 527 #endif /* Use GNU.  */
 528
 529 /* Change the process's working directory to PATH.  */
 530 extern int chdir (const char *__path) __THROW __nonnull ((1)) __wur;
 531 libc_hidden_proto(chdir)
 532
 533 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
 534 /* Change the process's working directory to the one FD is open on.  */
 535 extern int fchdir (int __fd) __THROW __wur;
 536 libc_hidden_proto(fchdir)
 537 #endif
 538
 539 /* Get the pathname of the current working directory,
 540    and put it in SIZE bytes of BUF.  Returns NULL if the
 541    directory couldn't be determined or SIZE was too small.
 542    If successful, returns BUF.  In GNU, if BUF is NULL,
 543    an array is allocated with `malloc'; the array is SIZE
 544    bytes long, unless SIZE == 0, in which case it is as
 545    big as necessary.  */
 546 extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
 547 libc_hidden_proto(getcwd)
 548
 549 #ifdef  __USE_GNU
 550 /* Return a malloc'd string containing the current directory name.
 551    If the environment variable `PWD' is set, and its value is correct,
 552    that value is used.  */
 553 extern char *get_current_dir_name (void) __THROW;
 554 #endif
 555
 556 #if 0 /*defined __USE_BSD || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8)*/
 557 /* Put the absolute pathname of the current working directory in BUF.
 558    If successful, return BUF.  If not, put an error message in
 559    BUF and return NULL.  BUF should be at least PATH_MAX bytes long.  */
 560 extern char *getwd (char *__buf)
 561      __THROW __nonnull ((1)) __attribute_deprecated__ __wur;
 562 #endif
 563
 564
 565 /* Duplicate FD, returning a new file descriptor on the same file.  */
 566 extern int dup (int __fd) __THROW __wur;
 567
 568 /* Duplicate FD to FD2, closing FD2 and making it open on the same file.  */
 569 extern int dup2 (int __fd, int __fd2) __THROW;
 570 libc_hidden_proto(dup2)
 571
 572 #ifdef __USE_GNU
 573 /* Duplicate FD to FD2, closing FD2 and making it open on the same
 574    file while setting flags according to FLAGS.  */
 575 extern int dup3 (int __fd, int __fd2, int __flags) __THROW;
 576 libc_hidden_proto(dup3)
 577 #endif
 578
 579 /* NULL-terminated array of "NAME=VALUE" environment variables.  */
 580 extern char **__environ;
 581 #ifdef __USE_GNU
 582 extern char **environ;
 583 #endif
 584
 585
 586 /* Replace the current process, executing PATH with arguments ARGV and
 587    environment ENVP.  ARGV and ENVP are terminated by NULL pointers.  */
 588 extern int execve (const char *__path, char *const __argv[],
 589                    char *const __envp[]) __THROW __nonnull ((1, 2));
 590 libc_hidden_proto(execve)
 591
 592 /* Execute the file FD refers to, overlaying the running program image.
 593    ARGV and ENVP are passed to the new program, as for `execve'.  */
 594 extern int fexecve (int __fd, char *const __argv[], char *const __envp[])
 595      __THROW __nonnull ((2));
 596 libc_hidden_proto(fexecve)
 597
 598 /* Execute PATH with arguments ARGV and environment from `environ'.  */
 599 extern int execv (const char *__path, char *const __argv[])
 600      __THROW __nonnull ((1, 2));
 601 libc_hidden_proto(execv)
 602
 603 /* Execute PATH with all arguments after PATH until a NULL pointer,
 604    and the argument after that for environment.  */
 605 extern int execle (const char *__path, const char *__arg, ...)
 606      __THROW __nonnull ((1, 2));
 607 libc_hidden_proto(execle)
 608
 609 /* Execute PATH with all arguments after PATH until
 610    a NULL pointer and environment from `environ'.  */
 611 extern int execl (const char *__path, const char *__arg, ...)
 612      __THROW __nonnull ((1, 2));
 613 libc_hidden_proto(execl)
 614
 615 /* Execute FILE, searching in the `PATH' environment variable if it contains
 616    no slashes, with arguments ARGV and environment from `environ'.  */
 617 extern int execvp (const char *__file, char *const __argv[])
 618      __THROW __nonnull ((1, 2));
 619 libc_hidden_proto(execvp)
 620
 621 /* Execute FILE, searching in the `PATH' environment variable if
 622    it contains no slashes, with all arguments after FILE until a
 623    NULL pointer and environment from `environ'.  */
 624 extern int execlp (const char *__file, const char *__arg, ...)
 625      __THROW __nonnull ((1, 2));
 626 libc_hidden_proto(execlp)
 627
 628 #ifdef __USE_GNU
 629 /* Execute FILE, searching in the `PATH' environment variable if it contains
 630    no slashes, with arguments ARGV and environment from a pointer */
 631 extern int execvpe (const char *__file, char *const __argv[],
 632                 char *const __envp[])
 633      __THROW __nonnull ((1, 2));
 634 libc_hidden_proto(execvpe)
 635 #endif
 636
 637
 638 #if defined __USE_MISC || defined __USE_XOPEN
 639 /* Add INC to priority of the current process.  */
 640 extern int nice (int __inc) __THROW __wur;
 641 #endif
 642
 643
 644 /* Terminate program execution with the low-order 8 bits of STATUS.  */
 645 extern void _exit (int __status) __attribute__ ((__noreturn__));
 646 libc_hidden_proto(_exit)
 647
 648
 649 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
 650    the `_SC_*' symbols for the NAME argument to `sysconf';
 651    and the `_CS_*' symbols for the NAME argument to `confstr'.  */
 652 #include <bits/confname.h>
 653
 654 /* Get file-specific configuration information about PATH.  */
 655 extern long int pathconf (const char *__path, int __name)
 656      __THROW __nonnull ((1));
 657
 658 /* Get file-specific configuration about descriptor FD.  */
 659 extern long int fpathconf (int __fd, int __name) __THROW;
 660
 661 /* Get the value of the system variable NAME.  */
 662 extern long int sysconf (int __name) __THROW;
 663 libc_hidden_proto(sysconf)
 664
 665 #ifdef  __USE_POSIX2
 666 /* Get the value of the string-valued system variable NAME.  */
 667 extern size_t confstr (int __name, char *__buf, size_t __len) __THROW;
 668 #endif
 669
 670
 671 /* Get the process ID of the calling process.  */
 672 extern __pid_t getpid (void) __THROW;
 673 libc_hidden_proto(getpid)
 674
 675 /* Get the process ID of the calling process's parent.  */
 676 extern __pid_t getppid (void) __THROW;
 677
 678 /* Get the process group ID of the calling process.  */
 679 extern __pid_t getpgrp (void) __THROW;
 680
 681 /* Get the process group ID of process PID.  */
 682 extern __pid_t __getpgid (__pid_t __pid) __THROW;
 683 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
 684 extern __pid_t getpgid (__pid_t __pid) __THROW;
 685 #endif
 686
 687
 688 /* Set the process group ID of the process matching PID to PGID.
 689    If PID is zero, the current process's process group ID is set.
 690    If PGID is zero, the process ID of the process is used.  */
 691 extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
 692 libc_hidden_proto(setpgid)
 693
 694 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 695 /* Both System V and BSD have `setpgrp' functions, but with different
 696    calling conventions.  The BSD function is the same as POSIX.1 `setpgid'
 697    (above).  The System V function takes no arguments and puts the calling
 698    process in its on group like `setpgid (0, 0)'.
 699
 700    New programs should always use `setpgid' instead.
 701
 702    GNU provides the POSIX.1 function.  */
 703
 704 /* Set the process group ID of the calling process to its own PID.
 705    This is exactly the same as `setpgid (0, 0)'.  */
 706 extern int setpgrp (void) __THROW;
 707
 708 #endif  /* Use misc or X/Open.  */
 709
 710 /* Create a new session with the calling process as its leader.
 711    The process group IDs of the session and the calling process
 712    are set to the process ID of the calling process, which is returned.  */
 713 extern __pid_t setsid (void) __THROW;
 714 libc_hidden_proto(setsid)
 715
 716 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
 717 /* Return the session ID of the given process.  */
 718 extern __pid_t getsid (__pid_t __pid) __THROW;
 719 libc_hidden_proto(getsid)
 720 #endif
 721
 722 /* Get the real user ID of the calling process.  */
 723 extern __uid_t getuid (void) __THROW;
 724 libc_hidden_proto(getuid)
 725
 726 /* Get the effective user ID of the calling process.  */
 727 extern __uid_t geteuid (void) __THROW;
 728 libc_hidden_proto(geteuid)
 729
 730 /* Get the real group ID of the calling process.  */
 731 extern __gid_t getgid (void) __THROW;
 732 libc_hidden_proto(getgid)
 733
 734 /* Get the effective group ID of the calling process.  */
 735 extern __gid_t getegid (void) __THROW;
 736 libc_hidden_proto(getegid)
 737
 738 /* If SIZE is zero, return the number of supplementary groups
 739    the calling process is in.  Otherwise, fill in the group IDs
 740    of its supplementary groups in LIST and return the number written.  */
 741 extern int getgroups (int __size, __gid_t __list[]) __THROW __wur;
 742 libc_hidden_proto(getgroups)
 743
 744 #if 0 /*def     __USE_GNU*/
 745 /* Return nonzero iff the calling process is in group GID.  */
 746 extern int group_member (__gid_t __gid) __THROW;
 747 #endif
 748
 749 /* Set the user ID of the calling process to UID.
 750    If the calling process is the super-user, set the real
 751    and effective user IDs, and the saved set-user-ID to UID;
 752    if not, the effective user ID is set to UID.  */
 753 extern int setuid (__uid_t __uid) __THROW __wur;
 754
 755 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 756 /* Set the real user ID of the calling process to RUID,
 757    and the effective user ID of the calling process to EUID.  */
 758 extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW __wur;
 759 libc_hidden_proto(setreuid)
 760 #endif
 761
 762 #if defined __USE_BSD || defined __USE_XOPEN2K
 763 /* Set the effective user ID of the calling process to UID.  */
 764 extern int seteuid (__uid_t __uid) __THROW __wur;
 765 libc_hidden_proto(seteuid)
 766 #endif
 767
 768 /* Set the group ID of the calling process to GID.
 769    If the calling process is the super-user, set the real
 770    and effective group IDs, and the saved set-group-ID to GID;
 771    if not, the effective group ID is set to GID.  */
 772 extern int setgid (__gid_t __gid) __THROW __wur;
 773
 774 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 775 /* Set the real group ID of the calling process to RGID,
 776    and the effective group ID of the calling process to EGID.  */
 777 extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW __wur;
 778 libc_hidden_proto(setregid)
 779 #endif
 780
 781 #if defined __USE_BSD || defined __USE_XOPEN2K
 782 /* Set the effective group ID of the calling process to GID.  */
 783 extern int setegid (__gid_t __gid) __THROW __wur;
 784 #endif /* Use BSD.  */
 785
 786 #ifdef __USE_GNU
 787 /* Fetch the real user ID, effective user ID, and saved-set user ID,
 788    of the calling process.  */
 789 extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid)
 790      __THROW;
 791
 792 /* Fetch the real group ID, effective group ID, and saved-set group ID,
 793    of the calling process.  */
 794 extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid)
 795      __THROW;
 796
 797 #if defined __UCLIBC_LINUX_SPECIFIC__
 798 /* Set the real user ID, effective user ID, and saved-set user ID,
 799    of the calling process to RUID, EUID, and SUID, respectively.  */
 800 extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid)
 801      __THROW __wur;
 802 libc_hidden_proto(setresuid)
 803 #endif
 804
 805 /* Set the real group ID, effective group ID, and saved-set group ID,
 806    of the calling process to RGID, EGID, and SGID, respectively.  */
 807 extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid)
 808      __THROW __wur;
 809 libc_hidden_proto(setresgid)
 810 #endif
 811
 812
 813 #if defined __UCLIBC_HAS_STUBS__ || defined __ARCH_USE_MMU__
 814 /* Clone the calling process, creating an exact copy.
 815    Return -1 for errors, 0 to the new process,
 816    and the process ID of the new process to the old process.  */
 817 extern __pid_t fork (void) __THROWNL;
 818 # ifdef _LIBC
 819 # ifdef __UCLIBC_HAS_THREADS__
 820 extern __typeof(fork) __libc_fork;
 821 # endif
 822 libc_hidden_proto(fork)
 823 # endif
 824 #endif
 825
 826 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 827 /* Clone the calling process, but without copying the whole address space.
 828    The calling process is suspended until the new process exits or is
 829    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
 830    and the process ID of the new process to the old process.  */
 831 extern __pid_t vfork (void) __THROW;
 832 libc_hidden_proto(vfork)
 833 #endif /* Use BSD. */
 834
 835 /* Return the pathname of the terminal FD is open on, or NULL on errors.
 836    The returned storage is good only until the next call to this function.  */
 837 extern char *ttyname (int __fd) __THROW;
 838
 839 /* Store at most BUFLEN characters of the pathname of the terminal FD is
 840    open on in BUF.  Return 0 on success, otherwise an error number.  */
 841 extern int ttyname_r (int __fd, char *__buf, size_t __buflen)
 842      __THROW __nonnull ((2)) __wur;
 843 libc_hidden_proto(ttyname_r)
 844
 845 /* Return 1 if FD is a valid descriptor associated
 846    with a terminal, zero if not.  */
 847 extern int isatty (int __fd) __THROW;
 848 libc_hidden_proto(isatty)
 849
 850 #if 0 /*defined __USE_BSD \
 851     || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)*/
 852 /* Return the index into the active-logins file (utmp) for
 853    the controlling terminal.  */
 854 extern int ttyslot (void) __THROW;
 855 #endif
 856
 857
 858 /* Make a link to FROM named TO.  */
 859 extern int link (const char *__from, const char *__to)
 860      __THROW __nonnull ((1, 2)) __wur;
 861
 862 #ifdef __USE_ATFILE
 863 /* Like link but relative paths in TO and FROM are interpreted relative
 864    to FROMFD and TOFD respectively.  */
 865 extern int linkat (int __fromfd, const char *__from, int __tofd,
 866                    const char *__to, int __flags)
 867      __THROW __nonnull ((2, 4)) __wur;
 868 libc_hidden_proto(linkat)
 869 #endif
 870
 871 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 872 /* Make a symbolic link to FROM named TO.  */
 873 extern int symlink (const char *__from, const char *__to)
 874      __THROW __nonnull ((1, 2)) __wur;
 875
 876 /* Read the contents of the symbolic link PATH into no more than
 877    LEN bytes of BUF.  The contents are not null-terminated.
 878    Returns the number of characters read, or -1 for errors.  */
 879 extern ssize_t readlink (const char *__restrict __path,
 880                          char *__restrict __buf, size_t __len)
 881      __THROW __nonnull ((1, 2)) __wur;
 882 libc_hidden_proto(readlink)
 883 #endif /* Use POSIX.1-2001.  */
 884
 885 #ifdef __USE_ATFILE
 886 /* Like symlink but a relative path in TO is interpreted relative to TOFD.  */
 887 extern int symlinkat (const char *__from, int __tofd,
 888                       const char *__to) __THROW __nonnull ((1, 3)) __wur;
 889 libc_hidden_proto(symlinkat)
 890
 891 /* Like readlink but a relative PATH is interpreted relative to FD.  */
 892 extern ssize_t readlinkat (int __fd, const char *__restrict __path,
 893                            char *__restrict __buf, size_t __len)
 894      __THROW __nonnull ((2, 3)) __wur;
 895 libc_hidden_proto(readlinkat)
 896 #endif
 897
 898 /* Remove the link NAME.  */
 899 extern int unlink (const char *__name) __THROW __nonnull ((1));
 900 libc_hidden_proto(unlink)
 901
 902 #ifdef __USE_ATFILE
 903 /* Remove the link NAME relative to FD.  */
 904 extern int unlinkat (int __fd, const char *__name, int __flag)
 905      __THROW __nonnull ((2));
 906 libc_hidden_proto(unlinkat)
 907 #endif
 908
 909 /* Remove the directory PATH.  */
 910 extern int rmdir (const char *__path) __THROW __nonnull ((1));
 911 libc_hidden_proto(rmdir)
 912
 913
 914 /* Return the foreground process group ID of FD.  */
 915 extern __pid_t tcgetpgrp (int __fd) __THROW;
 916 libc_hidden_proto(tcgetpgrp)
 917
 918 /* Set the foreground process group ID of FD set PGRP_ID.  */
 919 extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
 920
 921
 922 /* Return the login name of the user.
 923
 924    This function is a possible cancellation point and therefore not
 925    marked with __THROW.  */
 926 extern char *getlogin (void);
 927 libc_hidden_proto(getlogin)
 928 #if defined __USE_REENTRANT || defined __USE_POSIX199506
 929 /* Return at most NAME_LEN characters of the login name of the user in NAME.
 930    If it cannot be determined or some other error occurred, return the error
 931    code.  Otherwise return 0.
 932
 933    This function is a possible cancellation point and therefore not
 934    marked with __THROW.  */
 935 extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1));
 936 #endif
 937
 938 #if 0 /*def     __USE_BSD*/
 939 /* Set the login name returned by `getlogin'.  */
 940 extern int setlogin (const char *__name) __THROW __nonnull ((1));
 941 #endif
 942
 943
 944 #ifdef  __USE_POSIX2
 945 /* Get definitions and prototypes for functions to process the
 946    arguments in ARGV (ARGC of them, minus the program name) for
 947    options given in OPTS.  */
 948 # define __need_getopt
 949 /* keep this for uClibc in bits/, we need it when GNU_GETOPT is disabled */
 950 # include <bits/getopt.h>
 951 #endif
 952
 953
 954 #if defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K
 955 /* Put the name of the current host in no more than LEN bytes of NAME.
 956    The result is null-terminated if LEN is large enough for the full
 957    name and the terminator.  */
 958 extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1));
 959 libc_hidden_proto(gethostname)
 960 #endif
 961
 962
 963 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
 964 /* Set the name of the current host to NAME, which is LEN bytes long.
 965    This call is restricted to the super-user.  */
 966 extern int sethostname (const char *__name, size_t __len)
 967      __THROW __nonnull ((1)) __wur;
 968
 969 /* Set the current machine's Internet number to ID.
 970    This call is restricted to the super-user.  */
 971 extern int sethostid (long int __id) __THROW __wur;
 972
 973
 974 #if defined __UCLIBC_BSD_SPECIFIC__ || defined _LIBC
 975 /* Get and set the NIS (aka YP) domain name, if any.
 976    Called just like `gethostname' and `sethostname'.
 977    The NIS domain name is usually the empty string when not using NIS.  */
 978 extern int getdomainname (char *__name, size_t __len)
 979      __THROW __nonnull ((1)) __wur;
 980 libc_hidden_proto(getdomainname)
 981 #endif
 982 #if defined __UCLIBC_BSD_SPECIFIC__
 983 extern int setdomainname (const char *__name, size_t __len)
 984      __THROW __nonnull ((1)) __wur;
 985 #endif
 986
 987
 988 #if defined __UCLIBC_LINUX_SPECIFIC__
 989 /* Revoke access permissions to all processes currently communicating
 990    with the control terminal, and then send a SIGHUP signal to the process
 991    group of the control terminal.  */
 992 extern int vhangup (void) __THROW;
 993 #endif
 994
 995 #if 0
 996 /* Revoke the access of all descriptors currently open on FILE.  */
 997 extern int revoke (const char *__file) __THROW __nonnull ((1)) __wur;
 998
 999
1000 /* Enable statistical profiling, writing samples of the PC into at most
1001    SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
1002    is enabled, the system examines the user PC and increments
1003    SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536].  If SCALE is zero,
1004    disable profiling.  Returns zero on success, -1 on error.  */
1005 extern int profil (unsigned short int *__sample_buffer, size_t __size,
1006                    size_t __offset, unsigned int __scale)
1007      __THROW __nonnull ((1));
1008 #endif
1009
1010
1011 /* Turn accounting on if NAME is an existing file.  The system will then write
1012    a record for each process as it terminates, to this file.  If NAME is NULL,
1013    turn accounting off.  This call is restricted to the super-user.  */
1014 extern int acct (const char *__name) __THROW;
1015
1016
1017 /* Successive calls return the shells listed in `/etc/shells'.  */
1018 extern char *getusershell (void) __THROW;
1019 extern void endusershell (void) __THROW; /* Discard cached info.  */
1020 libc_hidden_proto(endusershell)
1021 extern void setusershell (void) __THROW; /* Rewind and re-read the file.  */
1022 libc_hidden_proto(setusershell)
1023
1024
1025 /* Put the program in the background, and dissociate from the controlling
1026    terminal.  If NOCHDIR is zero, do `chdir ("/")'.  If NOCLOSE is zero,
1027    redirects stdin, stdout, and stderr to /dev/null.  */
1028 extern int daemon (int __nochdir, int __noclose) __THROW __wur;
1029 #endif /* Use BSD || X/Open.  */
1030
1031
1032 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
1033 /* Make PATH be the root directory (the starting point for absolute paths).
1034    This call is restricted to the super-user.  */
1035 extern int chroot (const char *__path) __THROW __nonnull ((1)) __wur;
1036
1037 /* Prompt with PROMPT and read a string from the terminal without echoing.
1038    Uses /dev/tty if possible; otherwise stderr and stdin.  */
1039 extern char *getpass (const char *__prompt) __nonnull ((1));
1040 #endif /* Use BSD || X/Open.  */
1041
1042
1043 #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K
1044 /* Make all changes done to FD actually appear on disk.
1045
1046    This function is a cancellation point and therefore not marked with
1047    __THROW.  */
1048 extern int fsync (int __fd);
1049 #endif /* Use BSD || X/Open || Unix98.  */
1050
1051 #if defined __USE_GNU
1052 /* Make all changes done to all files on the file system associated
1053  *    with FD actually appear on disk.  */
1054 extern int syncfs (int __fd) __THROW;
1055 #endif
1056
1057 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
1058
1059 /* Return identifier for the current host.  */
1060 extern long int gethostid (void);
1061
1062 /* Make all changes done to all files actually appear on disk.  */
1063 extern void sync (void) __THROW;
1064
1065
1066 /* Return the number of bytes in a page.  This is the system's page size,
1067    which is not necessarily the same as the hardware page size.  */
1068 extern int getpagesize (void)  __THROW __attribute__ ((__const__));
1069 libc_hidden_proto(getpagesize)
1070
1071
1072 /* Return the maximum number of file descriptors
1073    the current process could possibly have.  */
1074 extern int getdtablesize (void) __THROW;
1075 libc_hidden_proto(getdtablesize)
1076
1077
1078 /* Truncate FILE to LENGTH bytes.  */
1079 # ifndef __USE_FILE_OFFSET64
1080 extern int truncate (const char *__file, __off_t __length)
1081      __THROW __nonnull ((1)) __wur;
1082 libc_hidden_proto(truncate)
1083 # else
1084 #  ifdef __REDIRECT_NTH
1085 extern int __REDIRECT_NTH (truncate,
1086                            (const char *__file, __off64_t __length),
1087                            truncate64) __nonnull ((1)) __wur;
1088 #  else
1089 #   define truncate truncate64
1090 #  endif
1091 # endif
1092 # ifdef __USE_LARGEFILE64
1093 extern int truncate64 (const char *__file, __off64_t __length)
1094      __THROW __nonnull ((1)) __wur;
1095 libc_hidden_proto(truncate64)
1096 # endif
1097
1098 #endif /* Use BSD || X/Open Unix.  */
1099
1100 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
1101
1102 /* Truncate the file FD is open on to LENGTH bytes.  */
1103 # ifndef __USE_FILE_OFFSET64
1104 extern int ftruncate (int __fd, __off_t __length) __THROW __wur;
1105 libc_hidden_proto(ftruncate)
1106 # else
1107 #  ifdef __REDIRECT_NTH
1108 extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length),
1109                            ftruncate64) __wur;
1110 #  else
1111 #   define ftruncate ftruncate64
1112 #  endif
1113 # endif
1114 # ifdef __USE_LARGEFILE64
1115 extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur;
1116 libc_hidden_proto(ftruncate64)
1117 # endif
1118
1119 #endif /* Use BSD || X/Open Unix || POSIX 2003.  */
1120
1121
1122 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
1123
1124 /* Set the end of accessible data space (aka "the break") to ADDR.
1125    Returns zero on success and -1 for errors (with errno set).  */
1126 extern int brk (void *__addr) __THROW __wur;
1127 libc_hidden_proto(brk)
1128
1129 /* Increase or decrease the end of accessible data space by DELTA bytes.
1130    If successful, returns the address the previous end of data space
1131    (i.e. the beginning of the new space, if DELTA > 0);
1132    returns (void *) -1 for errors (with errno set).  */
1133 extern void *sbrk (intptr_t __delta) __THROW;
1134 libc_hidden_proto(sbrk)
1135 #endif
1136
1137
1138 #ifdef __USE_MISC
1139 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
1140    This is completely system-dependent, and not often useful.
1141
1142    In Unix, `syscall' sets `errno' for all errors and most calls return -1
1143    for errors; in many systems you cannot pass arguments or get return
1144    values for all system calls (`pipe', `fork', and `getppid' typically
1145    among them).
1146
1147    In Mach, all system calls take normal arguments and always return an
1148    error code (zero for success).  */
1149 extern long int syscall (long int __sysno, ...) __THROW;
1150
1151 #endif  /* Use misc.  */
1152
1153 /* Are we in a secure process environment or are we dealing with setuid
1154  * stuff?  This value is returned by issetugid().
1155  */
1156 extern int _pe_secure;
1157 libc_hidden_proto(_pe_secure)
1158
1159 #ifdef __USE_BSD
1160 /* issetugid() returns 1 if the process environment or memory address space
1161    is considered tainted, and returns 0 otherwise.  This happens, for example,
1162    when a process's privileges are elevated by the setuid or setgid flags on
1163    an executable belonging to root.
1164 */
1165 extern int issetugid(void);
1166 #endif
1167
1168 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
1169 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
1170    files consistent.  Some systems have them there and some here, and some
1171    software depends on the macros being defined without including both.  */
1172
1173 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
1174    LEN is always relative to the current file position.
1175    The CMD argument is one of the following.
1176
1177    This function is a cancellation point and therefore not marked with
1178    __THROW.  */
1179
1180 # define F_ULOCK 0      /* Unlock a previously locked region.  */
1181 # define F_LOCK  1      /* Lock a region for exclusive use.  */
1182 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
1183 # define F_TEST  3      /* Test a region for other processes locks.  */
1184
1185 # ifndef __USE_FILE_OFFSET64
1186 extern int lockf (int __fd, int __cmd, __off_t __len) __wur;
1187 libc_hidden_proto(lockf)
1188 # else
1189 #  ifdef __REDIRECT
1190 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len),
1191                        lockf64) __wur;
1192 #  else
1193 #   define lockf lockf64
1194 #  endif
1195 # endif
1196 # ifdef __USE_LARGEFILE64
1197 extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur;
1198 # endif
1199 #endif /* Use misc and F_LOCK not already defined.  */
1200
1201
1202 #ifdef __USE_GNU
1203
1204 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
1205    set to EINTR.  */
1206
1207 # define TEMP_FAILURE_RETRY(expression) \
1208   (__extension__                                                              \
1209     ({ long int __result;                                                     \
1210        do __result = (long int) (expression);                                 \
1211        while (__result == -1L && errno == EINTR);                             \
1212        __result; }))
1213 #endif
1214
1215 #if (defined __USE_POSIX199309 || defined __USE_UNIX98) \
1216         && defined __UCLIBC_HAS_REALTIME__
1217 /* Synchronize at least the data part of a file with the underlying
1218    media.  */
1219 extern int fdatasync (int __fildes);
1220 #endif /* Use POSIX199309 */
1221
1222
1223 /* XPG4.2 specifies that prototypes for the encryption functions must
1224    be defined here.  */
1225 #ifdef  __USE_XOPEN
1226 # if defined __UCLIBC_HAS_CRYPT__
1227 /* Encrypt at most 8 characters from KEY using salt to perturb DES.  */
1228 extern char *crypt (const char *__key, const char *__salt)
1229      __THROW __nonnull ((1, 2));
1230
1231 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
1232    block in place.  */
1233 extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
1234 # endif /* __UCLIBC_HAS_CRYPT__ */
1235
1236
1237 /* Swab pairs bytes in the first N bytes of the area pointed to by
1238    FROM and copy the result to TO.  The value of TO must not be in the
1239    range [FROM - N + 1, FROM - 1].  If N is odd the first byte in FROM
1240    is without partner.  */
1241 extern void swab (const void *__restrict __from, void *__restrict __to,
1242                   ssize_t __n) __THROW __nonnull ((1, 2));
1243 #endif
1244
1245
1246 /* The Single Unix specification demands this prototype to be here.
1247    It is also found in <stdio.h>.  */
1248 #if defined __USE_XOPEN && !defined __USE_XOPEN2K
1249 /* Return the name of the controlling terminal.  */
1250 extern char *ctermid (char *__s) __THROW;
1251 #endif
1252
1253 __END_DECLS
1254
1255
1256 #ifdef _LIBC
1257 #ifndef smallint_type /* if arch didn't override it in bits/wordsize.h */
1258 #define smallint_type int
1259 #endif
1260 typedef signed smallint_type smallint;
1261 typedef unsigned smallint_type smalluint;
1262 extern size_t __pagesize attribute_hidden;
1263 #endif
1264
1265
1266 #endif /* unistd.h  */