posix/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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /*
  20  *      POSIX Standard: 2.10 Symbolic Constants         <unistd.h>
  21  */
  22
  23 #ifndef _UNISTD_H
  24 #define _UNISTD_H       1
  25
  26 #include <features.h>
  27
  28 __BEGIN_DECLS
  29
  30 /* These may be used to determine what facilities are present at compile time.
  31    Their values can be obtained at run time from `sysconf'.  */
  32
  33 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008.  */
  34 #define _POSIX_VERSION  200809L
  35
  36 /* These are not #ifdef __USE_POSIX2 because they are
  37    in the theoretically application-owned namespace.  */
  38
  39 /* The utilities on GNU systems also correspond to this version.  */
  40 #define _POSIX2_VERSION 200809L
  41
  42 /* If defined, the implementation supports the
  43    C Language Bindings Option.  */
  44 #define _POSIX2_C_BIND  200809L
  45
  46 /* If defined, the implementation supports the
  47    C Language Development Utilities Option.  */
  48 #define _POSIX2_C_DEV   200809L
  49
  50 /* If defined, the implementation supports the
  51    Software Development Utilities Option.  */
  52 #define _POSIX2_SW_DEV  200809L
  53
  54 /* If defined, the implementation supports the
  55    creation of locales with the localedef utility.  */
  56 #define _POSIX2_LOCALEDEF       200809L
  57
  58 /* X/Open version number to which the library conforms.  It is selectable.  */
  59 #ifdef __USE_XOPEN2K8
  60 # define _XOPEN_VERSION 700
  61 #elif defined __USE_XOPEN2K
  62 # define _XOPEN_VERSION 600
  63 #elif defined __USE_UNIX98
  64 # define _XOPEN_VERSION 500
  65 #else
  66 # define _XOPEN_VERSION 4
  67 #endif
  68
  69 /* Commands and utilities from XPG4 are available.  */
  70 #define _XOPEN_XCU_VERSION      4
  71
  72 /* We are compatible with the old published standards as well.  */
  73 #define _XOPEN_XPG2     1
  74 #define _XOPEN_XPG3     1
  75 #define _XOPEN_XPG4     1
  76
  77 /* The X/Open Unix extensions are available.  */
  78 #define _XOPEN_UNIX     1
  79
  80 /* Encryption is present.  */
  81 #define _XOPEN_CRYPT    1
  82
  83 /* The enhanced internationalization capabilities according to XPG4.2
  84    are present.  */
  85 #define _XOPEN_ENH_I18N 1
  86
  87 /* The legacy interfaces are also available.  */
  88 #define _XOPEN_LEGACY   1
  89
  90
  91 /* Get values of POSIX options:
  92
  93    If these symbols are defined, the corresponding features are
  94    always available.  If not, they may be available sometimes.
  95    The current values can be obtained with `sysconf'.
  96
  97    _POSIX_JOB_CONTROL           Job control is supported.
  98    _POSIX_SAVED_IDS             Processes have a saved set-user-ID
  99                                 and a saved set-group-ID.
 100    _POSIX_REALTIME_SIGNALS      Real-time, queued signals are supported.
 101    _POSIX_PRIORITY_SCHEDULING   Priority scheduling is supported.
 102    _POSIX_TIMERS                POSIX.4 clocks and timers are supported.
 103    _POSIX_ASYNCHRONOUS_IO       Asynchronous I/O is supported.
 104    _POSIX_PRIORITIZED_IO        Prioritized asynchronous I/O is supported.
 105    _POSIX_SYNCHRONIZED_IO       Synchronizing file data is supported.
 106    _POSIX_FSYNC                 The fsync function is present.
 107    _POSIX_MAPPED_FILES          Mapping of files to memory is supported.
 108    _POSIX_MEMLOCK               Locking of all memory is supported.
 109    _POSIX_MEMLOCK_RANGE         Locking of ranges of memory is supported.
 110    _POSIX_MEMORY_PROTECTION     Setting of memory protections is supported.
 111    _POSIX_MESSAGE_PASSING       POSIX.4 message queues are supported.
 112    _POSIX_SEMAPHORES            POSIX.4 counting semaphores are supported.
 113    _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
 114    _POSIX_THREADS               POSIX.1c pthreads are supported.
 115    _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
 116    _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
 117    _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
 118    _POSIX_THREAD_PRIORITY_SCHEDULING
 119                                 POSIX.1c thread execution scheduling supported.
 120    _POSIX_THREAD_PRIO_INHERIT   Thread priority inheritance option supported.
 121    _POSIX_THREAD_PRIO_PROTECT   Thread priority protection option supported.
 122    _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
 123    _POSIX_PII                   Protocol-independent interfaces are supported.
 124    _POSIX_PII_XTI               XTI protocol-indep. interfaces are supported.
 125    _POSIX_PII_SOCKET            Socket protocol-indep. interfaces are supported.
 126    _POSIX_PII_INTERNET          Internet family of protocols supported.
 127    _POSIX_PII_INTERNET_STREAM   Connection-mode Internet protocol supported.
 128    _POSIX_PII_INTERNET_DGRAM    Connectionless Internet protocol supported.
 129    _POSIX_PII_OSI               ISO/OSI family of protocols supported.
 130    _POSIX_PII_OSI_COTS          Connection-mode ISO/OSI service supported.
 131    _POSIX_PII_OSI_CLTS          Connectionless ISO/OSI service supported.
 132    _POSIX_POLL                  Implementation supports `poll' function.
 133    _POSIX_SELECT                Implementation supports `select' and `pselect'.
 134
 135    _XOPEN_REALTIME              X/Open realtime support is available.
 136    _XOPEN_REALTIME_THREADS      X/Open realtime thread support is available.
 137    _XOPEN_SHM                   Shared memory interface according to XPG4.2.
 138
 139    _XBS5_ILP32_OFF32            Implementation provides environment with 32-bit
 140                                 int, long, pointer, and off_t types.
 141    _XBS5_ILP32_OFFBIG           Implementation provides environment with 32-bit
 142                                 int, long, and pointer and off_t with at least
 143                                 64 bits.
 144    _XBS5_LP64_OFF64             Implementation provides environment with 32-bit
 145                                 int, and 64-bit long, pointer, and off_t types.
 146    _XBS5_LPBIG_OFFBIG           Implementation provides environment with at
 147                                 least 32 bits int and long, pointer, and off_t
 148                                 with at least 64 bits.
 149
 150    If any of these symbols is defined as -1, the corresponding option is not
 151    true for any file.  If any is defined as other than -1, the corresponding
 152    option is true for all files.  If a symbol is not defined at all, the value
 153    for a specific file can be obtained from `pathconf' and `fpathconf'.
 154
 155    _POSIX_CHOWN_RESTRICTED      Only the super user can use `chown' to change
 156                                 the owner of a file.  `chown' can only be used
 157                                 to change the group ID of a file to a group of
 158                                 which the calling process is a member.
 159    _POSIX_NO_TRUNC              Pathname components longer than
 160                                 NAME_MAX generate an error.
 161    _POSIX_VDISABLE              If defined, if the value of an element of the
 162                                 `c_cc' member of `struct termios' is
 163                                 _POSIX_VDISABLE, no character will have the
 164                                 effect associated with that element.
 165    _POSIX_SYNC_IO               Synchronous I/O may be performed.
 166    _POSIX_ASYNC_IO              Asynchronous I/O may be performed.
 167    _POSIX_PRIO_IO               Prioritized Asynchronous I/O may be performed.
 168
 169    Support for the Large File Support interface is not generally available.
 170    If it is available the following constants are defined to one.
 171    _LFS64_LARGEFILE             Low-level I/O supports large files.
 172    _LFS64_STDIO                 Standard I/O supports large files.
 173    */
 174
 175 #include <bits/posix_opt.h>
 176
 177 /* Get the environment definitions from Unix98.  */
 178 #ifdef __USE_UNIX98
 179 # include <bits/environments.h>
 180 #endif
 181
 182 /* Standard file descriptors.  */
 183 #define STDIN_FILENO    0       /* Standard input.  */
 184 #define STDOUT_FILENO   1       /* Standard output.  */
 185 #define STDERR_FILENO   2       /* Standard error output.  */
 186
 187
 188 /* All functions that are not declared anywhere else.  */
 189
 190 #include <bits/types.h>
 191
 192 #ifndef __ssize_t_defined
 193 typedef __ssize_t ssize_t;
 194 # define __ssize_t_defined
 195 #endif
 196
 197 #define __need_size_t
 198 #define __need_NULL
 199 #include <stddef.h>
 200
 201 #if defined __USE_XOPEN || defined __USE_XOPEN2K
 202 /* The Single Unix specification says that some more types are
 203    available here.  */
 204 # ifndef __gid_t_defined
 205 typedef __gid_t gid_t;
 206 #  define __gid_t_defined
 207 # endif
 208
 209 # ifndef __uid_t_defined
 210 typedef __uid_t uid_t;
 211 #  define __uid_t_defined
 212 # endif
 213
 214 # ifndef __off_t_defined
 215 #  ifndef __USE_FILE_OFFSET64
 216 typedef __off_t off_t;
 217 #  else
 218 typedef __off64_t off_t;
 219 #  endif
 220 #  define __off_t_defined
 221 # endif
 222 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
 223 typedef __off64_t off64_t;
 224 #  define __off64_t_defined
 225 # endif
 226
 227 # ifndef __useconds_t_defined
 228 typedef __useconds_t useconds_t;
 229 #  define __useconds_t_defined
 230 # endif
 231
 232 # ifndef __pid_t_defined
 233 typedef __pid_t pid_t;
 234 #  define __pid_t_defined
 235 # endif
 236 #endif  /* X/Open */
 237
 238 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 239 # ifndef __intptr_t_defined
 240 typedef __intptr_t intptr_t;
 241 #  define __intptr_t_defined
 242 # endif
 243 #endif
 244
 245 #if defined __USE_BSD || defined __USE_XOPEN
 246 # ifndef __socklen_t_defined
 247 typedef __socklen_t socklen_t;
 248 #  define __socklen_t_defined
 249 # endif
 250 #endif
 251
 252 /* Values for the second argument to access.
 253    These may be OR'd together.  */
 254 #define R_OK    4               /* Test for read permission.  */
 255 #define W_OK    2               /* Test for write permission.  */
 256 #define X_OK    1               /* Test for execute permission.  */
 257 #define F_OK    0               /* Test for existence.  */
 258
 259 /* Test for access to NAME using the real UID and real GID.  */
 260 extern int access (__const char *__name, int __type) __THROW __nonnull ((1));
 261
 262 #ifdef __USE_GNU
 263 /* Test for access to NAME using the effective UID and GID
 264    (as normal file operations use).  */
 265 extern int euidaccess (__const char *__name, int __type)
 266      __THROW __nonnull ((1));
 267
 268 /* An alias for `euidaccess', used by some other systems.  */
 269 extern int eaccess (__const char *__name, int __type)
 270      __THROW __nonnull ((1));
 271 #endif
 272
 273 #ifdef __USE_ATFILE
 274 /* Test for access to FILE relative to the directory FD is open on.
 275    If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess',
 276    otherwise use real IDs like `access'.  */
 277 extern int faccessat (int __fd, __const char *__file, int __type, int __flag)
 278      __THROW __nonnull ((2)) __wur;
 279 #endif /* Use GNU.  */
 280
 281
 282 /* Values for the WHENCE argument to lseek.  */
 283 #ifndef _STDIO_H                /* <stdio.h> has the same definitions.  */
 284 # define SEEK_SET       0       /* Seek from beginning of file.  */
 285 # define SEEK_CUR       1       /* Seek from current position.  */
 286 # define SEEK_END       2       /* Seek from end of file.  */
 287 #endif
 288
 289 #if defined __USE_BSD && !defined L_SET
 290 /* Old BSD names for the same constants; just for compatibility.  */
 291 # define L_SET          SEEK_SET
 292 # define L_INCR         SEEK_CUR
 293 # define L_XTND         SEEK_END
 294 #endif
 295
 296
 297 /* Move FD's file position to OFFSET bytes from the
 298    beginning of the file (if WHENCE is SEEK_SET),
 299    the current position (if WHENCE is SEEK_CUR),
 300    or the end of the file (if WHENCE is SEEK_END).
 301    Return the new file position.  */
 302 #ifndef __USE_FILE_OFFSET64
 303 extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;
 304 #else
 305 # ifdef __REDIRECT_NTH
 306 extern __off64_t __REDIRECT_NTH (lseek,
 307                                  (int __fd, __off64_t __offset, int __whence),
 308                                  lseek64);
 309 # else
 310 #  define lseek lseek64
 311 # endif
 312 #endif
 313 #ifdef __USE_LARGEFILE64
 314 extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
 315      __THROW;
 316 #endif
 317
 318 /* Close the file descriptor FD.
 319
 320    This function is a cancellation point and therefore not marked with
 321    __THROW.  */
 322 extern int close (int __fd);
 323
 324 /* Read NBYTES into BUF from FD.  Return the
 325    number read, -1 for errors or 0 for EOF.
 326
 327    This function is a cancellation point and therefore not marked with
 328    __THROW.  */
 329 extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;
 330
 331 /* Write N bytes of BUF to FD.  Return the number written, or -1.
 332
 333    This function is a cancellation point and therefore not marked with
 334    __THROW.  */
 335 extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur;
 336
 337 #ifdef __USE_UNIX98
 338 # ifndef __USE_FILE_OFFSET64
 339 /* Read NBYTES into BUF from FD at the given position OFFSET without
 340    changing the file pointer.  Return the number read, -1 for errors
 341    or 0 for EOF.
 342
 343    This function is a cancellation point and therefore not marked with
 344    __THROW.  */
 345 extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
 346                       __off_t __offset) __wur;
 347
 348 /* Write N bytes of BUF to FD at the given position OFFSET without
 349    changing the file pointer.  Return the number written, or -1.
 350
 351    This function is a cancellation point and therefore not marked with
 352    __THROW.  */
 353 extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n,
 354                        __off_t __offset) __wur;
 355 # else
 356 #  ifdef __REDIRECT
 357 extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
 358                                    __off64_t __offset),
 359                            pread64) __wur;
 360 extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf,
 361                                     size_t __nbytes, __off64_t __offset),
 362                            pwrite64) __wur;
 363 #  else
 364 #   define pread pread64
 365 #   define pwrite pwrite64
 366 #  endif
 367 # endif
 368
 369 # ifdef __USE_LARGEFILE64
 370 /* Read NBYTES into BUF from FD at the given position OFFSET without
 371    changing the file pointer.  Return the number read, -1 for errors
 372    or 0 for EOF.  */
 373 extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
 374                         __off64_t __offset) __wur;
 375 /* Write N bytes of BUF to FD at the given position OFFSET without
 376    changing the file pointer.  Return the number written, or -1.  */
 377 extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n,
 378                          __off64_t __offset) __wur;
 379 # endif
 380 #endif
 381
 382 /* Create a one-way communication channel (pipe).
 383    If successful, two file descriptors are stored in PIPEDES;
 384    bytes written on PIPEDES[1] can be read from PIPEDES[0].
 385    Returns 0 if successful, -1 if not.  */
 386 extern int pipe (int __pipedes[2]) __THROW __wur;
 387
 388 #ifdef __USE_GNU
 389 /* Same as pipe but apply flags passed in FLAGS to the new file
 390    descriptors.  */
 391 extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;
 392 #endif
 393
 394 /* Schedule an alarm.  In SECONDS seconds, the process will get a SIGALRM.
 395    If SECONDS is zero, any currently scheduled alarm will be cancelled.
 396    The function returns the number of seconds remaining until the last
 397    alarm scheduled would have signaled, or zero if there wasn't one.
 398    There is no return value to indicate an error, but you can set `errno'
 399    to 0 and check its value after calling `alarm', and this might tell you.
 400    The signal may come late due to processor scheduling.  */
 401 extern unsigned int alarm (unsigned int __seconds) __THROW;
 402
 403 /* Make the process sleep for SECONDS seconds, or until a signal arrives
 404    and is not ignored.  The function returns the number of seconds less
 405    than SECONDS which it actually slept (thus zero if it slept the full time).
 406    If a signal handler does a `longjmp' or modifies the handling of the
 407    SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
 408    signal afterwards is undefined.  There is no return value to indicate
 409    error, but if `sleep' returns SECONDS, it probably didn't work.
 410
 411    This function is a cancellation point and therefore not marked with
 412    __THROW.  */
 413 extern unsigned int sleep (unsigned int __seconds);
 414
 415 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 416 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
 417    microseconds.  If INTERVAL is nonzero, when the alarm goes off, the
 418    timer is reset to go off every INTERVAL microseconds thereafter.
 419    Returns the number of microseconds remaining before the alarm.  */
 420 extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)
 421      __THROW;
 422
 423 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
 424    or ignored.
 425
 426    This function is a cancellation point and therefore not marked with
 427    __THROW.  */
 428 extern int usleep (__useconds_t __useconds);
 429 #endif
 430
 431
 432 /* Suspend the process until a signal arrives.
 433    This always returns -1 and sets `errno' to EINTR.
 434
 435    This function is a cancellation point and therefore not marked with
 436    __THROW.  */
 437 extern int pause (void);
 438
 439
 440 /* Change the owner and group of FILE.  */
 441 extern int chown (__const char *__file, __uid_t __owner, __gid_t __group)
 442      __THROW __nonnull ((1)) __wur;
 443
 444 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 445 /* Change the owner and group of the file that FD is open on.  */
 446 extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;
 447
 448
 449 /* Change owner and group of FILE, if it is a symbolic
 450    link the ownership of the symbolic link is changed.  */
 451 extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group)
 452      __THROW __nonnull ((1)) __wur;
 453
 454 #endif /* Use BSD || X/Open Unix.  */
 455
 456 #ifdef __USE_ATFILE
 457 /* Change the owner and group of FILE relative to the directory FD is open
 458    on.  */
 459 extern int fchownat (int __fd, __const char *__file, __uid_t __owner,
 460                      __gid_t __group, int __flag)
 461      __THROW __nonnull ((2)) __wur;
 462 #endif /* Use GNU.  */
 463
 464 /* Change the process's working directory to PATH.  */
 465 extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur;
 466
 467 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 468 /* Change the process's working directory to the one FD is open on.  */
 469 extern int fchdir (int __fd) __THROW __wur;
 470 #endif
 471
 472 /* Get the pathname of the current working directory,
 473    and put it in SIZE bytes of BUF.  Returns NULL if the
 474    directory couldn't be determined or SIZE was too small.
 475    If successful, returns BUF.  In GNU, if BUF is NULL,
 476    an array is allocated with `malloc'; the array is SIZE
 477    bytes long, unless SIZE == 0, in which case it is as
 478    big as necessary.  */
 479 extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
 480
 481 #ifdef  __USE_GNU
 482 /* Return a malloc'd string containing the current directory name.
 483    If the environment variable `PWD' is set, and its value is correct,
 484    that value is used.  */
 485 extern char *get_current_dir_name (void) __THROW;
 486 #endif
 487
 488 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 489 /* Put the absolute pathname of the current working directory in BUF.
 490    If successful, return BUF.  If not, put an error message in
 491    BUF and return NULL.  BUF should be at least PATH_MAX bytes long.  */
 492 extern char *getwd (char *__buf)
 493      __THROW __nonnull ((1)) __attribute_deprecated__ __wur;
 494 #endif
 495
 496
 497 /* Duplicate FD, returning a new file descriptor on the same file.  */
 498 extern int dup (int __fd) __THROW __wur;
 499
 500 /* Duplicate FD to FD2, closing FD2 and making it open on the same file.  */
 501 extern int dup2 (int __fd, int __fd2) __THROW;
 502
 503 #ifdef __USE_GNU
 504 /* Duplicate FD to FD2, closing FD2 and making it open on the same
 505    file while setting flags according to FLAGS.  */
 506 extern int dup3 (int __fd, int __fd2, int __flags) __THROW;
 507 #endif
 508
 509 /* NULL-terminated array of "NAME=VALUE" environment variables.  */
 510 extern char **__environ;
 511 #ifdef __USE_GNU
 512 extern char **environ;
 513 #endif
 514
 515
 516 /* Replace the current process, executing PATH with arguments ARGV and
 517    environment ENVP.  ARGV and ENVP are terminated by NULL pointers.  */
 518 extern int execve (__const char *__path, char *__const __argv[],
 519                    char *__const __envp[]) __THROW __nonnull ((1));
 520
 521 #ifdef __USE_XOPEN2K8
 522 /* Execute the file FD refers to, overlaying the running program image.
 523    ARGV and ENVP are passed to the new program, as for `execve'.  */
 524 extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[])
 525      __THROW;
 526 #endif
 527
 528
 529 /* Execute PATH with arguments ARGV and environment from `environ'.  */
 530 extern int execv (__const char *__path, char *__const __argv[])
 531      __THROW __nonnull ((1));
 532
 533 /* Execute PATH with all arguments after PATH until a NULL pointer,
 534    and the argument after that for environment.  */
 535 extern int execle (__const char *__path, __const char *__arg, ...)
 536      __THROW __nonnull ((1));
 537
 538 /* Execute PATH with all arguments after PATH until
 539    a NULL pointer and environment from `environ'.  */
 540 extern int execl (__const char *__path, __const char *__arg, ...)
 541      __THROW __nonnull ((1));
 542
 543 /* Execute FILE, searching in the `PATH' environment variable if it contains
 544    no slashes, with arguments ARGV and environment from `environ'.  */
 545 extern int execvp (__const char *__file, char *__const __argv[])
 546      __THROW __nonnull ((1));
 547
 548 /* Execute FILE, searching in the `PATH' environment variable if
 549    it contains no slashes, with all arguments after FILE until a
 550    NULL pointer and environment from `environ'.  */
 551 extern int execlp (__const char *__file, __const char *__arg, ...)
 552      __THROW __nonnull ((1));
 553
 554 #ifdef __USE_GNU
 555 /* Execute FILE, searching in the `PATH' environment variable if it contains
 556    no slashes, with arguments ARGV and environment from `environ'.  */
 557 extern int execvpe (__const char *__file, char *__const __argv[],
 558                     char *__const __envp[])
 559      __THROW __nonnull ((1));
 560 #endif
 561
 562
 563 #if defined __USE_MISC || defined __USE_XOPEN
 564 /* Add INC to priority of the current process.  */
 565 extern int nice (int __inc) __THROW __wur;
 566 #endif
 567
 568
 569 /* Terminate program execution with the low-order 8 bits of STATUS.  */
 570 extern void _exit (int __status) __attribute__ ((__noreturn__));
 571
 572
 573 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
 574    the `_SC_*' symbols for the NAME argument to `sysconf';
 575    and the `_CS_*' symbols for the NAME argument to `confstr'.  */
 576 #include <bits/confname.h>
 577
 578 /* Get file-specific configuration information about PATH.  */
 579 extern long int pathconf (__const char *__path, int __name)
 580      __THROW __nonnull ((1));
 581
 582 /* Get file-specific configuration about descriptor FD.  */
 583 extern long int fpathconf (int __fd, int __name) __THROW;
 584
 585 /* Get the value of the system variable NAME.  */
 586 extern long int sysconf (int __name) __THROW;
 587
 588 #ifdef  __USE_POSIX2
 589 /* Get the value of the string-valued system variable NAME.  */
 590 extern size_t confstr (int __name, char *__buf, size_t __len) __THROW;
 591 #endif
 592
 593
 594 /* Get the process ID of the calling process.  */
 595 extern __pid_t getpid (void) __THROW;
 596
 597 /* Get the process ID of the calling process's parent.  */
 598 extern __pid_t getppid (void) __THROW;
 599
 600 /* Get the process group ID of the calling process.
 601    This function is different on old BSD. */
 602 #ifndef __FAVOR_BSD
 603 extern __pid_t getpgrp (void) __THROW;
 604 #else
 605 # ifdef __REDIRECT_NTH
 606 extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid);
 607 # else
 608 #  define getpgrp __getpgid
 609 # endif
 610 #endif
 611
 612 /* Get the process group ID of process PID.  */
 613 extern __pid_t __getpgid (__pid_t __pid) __THROW;
 614 #ifdef __USE_XOPEN_EXTENDED
 615 extern __pid_t getpgid (__pid_t __pid) __THROW;
 616 #endif
 617
 618
 619 /* Set the process group ID of the process matching PID to PGID.
 620    If PID is zero, the current process's process group ID is set.
 621    If PGID is zero, the process ID of the process is used.  */
 622 extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
 623
 624 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 625 /* Both System V and BSD have `setpgrp' functions, but with different
 626    calling conventions.  The BSD function is the same as POSIX.1 `setpgid'
 627    (above).  The System V function takes no arguments and puts the calling
 628    process in its on group like `setpgid (0, 0)'.
 629
 630    New programs should always use `setpgid' instead.
 631
 632    The default in GNU is to provide the System V function.  The BSD
 633    function is available under -D_BSD_SOURCE.  */
 634
 635 # ifndef __FAVOR_BSD
 636
 637 /* Set the process group ID of the calling process to its own PID.
 638    This is exactly the same as `setpgid (0, 0)'.  */
 639 extern int setpgrp (void) __THROW;
 640
 641 # else
 642
 643 /* Another name for `setpgid' (above).  */
 644 #  ifdef __REDIRECT_NTH
 645 extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid);
 646 #  else
 647 #   define setpgrp setpgid
 648 #  endif
 649
 650 # endif /* Favor BSD.  */
 651 #endif  /* Use SVID or BSD.  */
 652
 653 /* Create a new session with the calling process as its leader.
 654    The process group IDs of the session and the calling process
 655    are set to the process ID of the calling process, which is returned.  */
 656 extern __pid_t setsid (void) __THROW;
 657
 658 #ifdef __USE_XOPEN_EXTENDED
 659 /* Return the session ID of the given process.  */
 660 extern __pid_t getsid (__pid_t __pid) __THROW;
 661 #endif
 662
 663 /* Get the real user ID of the calling process.  */
 664 extern __uid_t getuid (void) __THROW;
 665
 666 /* Get the effective user ID of the calling process.  */
 667 extern __uid_t geteuid (void) __THROW;
 668
 669 /* Get the real group ID of the calling process.  */
 670 extern __gid_t getgid (void) __THROW;
 671
 672 /* Get the effective group ID of the calling process.  */
 673 extern __gid_t getegid (void) __THROW;
 674
 675 /* If SIZE is zero, return the number of supplementary groups
 676    the calling process is in.  Otherwise, fill in the group IDs
 677    of its supplementary groups in LIST and return the number written.  */
 678 extern int getgroups (int __size, __gid_t __list[]) __THROW __wur;
 679
 680 #ifdef  __USE_GNU
 681 /* Return nonzero iff the calling process is in group GID.  */
 682 extern int group_member (__gid_t __gid) __THROW;
 683 #endif
 684
 685 /* Set the user ID of the calling process to UID.
 686    If the calling process is the super-user, set the real
 687    and effective user IDs, and the saved set-user-ID to UID;
 688    if not, the effective user ID is set to UID.  */
 689 extern int setuid (__uid_t __uid) __THROW;
 690
 691 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 692 /* Set the real user ID of the calling process to RUID,
 693    and the effective user ID of the calling process to EUID.  */
 694 extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW;
 695 #endif
 696
 697 #if defined __USE_BSD || defined __USE_XOPEN2K
 698 /* Set the effective user ID of the calling process to UID.  */
 699 extern int seteuid (__uid_t __uid) __THROW;
 700 #endif /* Use BSD.  */
 701
 702 /* Set the group ID of the calling process to GID.
 703    If the calling process is the super-user, set the real
 704    and effective group IDs, and the saved set-group-ID to GID;
 705    if not, the effective group ID is set to GID.  */
 706 extern int setgid (__gid_t __gid) __THROW;
 707
 708 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 709 /* Set the real group ID of the calling process to RGID,
 710    and the effective group ID of the calling process to EGID.  */
 711 extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW;
 712 #endif
 713
 714 #if defined __USE_BSD || defined __USE_XOPEN2K
 715 /* Set the effective group ID of the calling process to GID.  */
 716 extern int setegid (__gid_t __gid) __THROW;
 717 #endif /* Use BSD.  */
 718
 719 #ifdef __USE_GNU
 720 /* Fetch the real user ID, effective user ID, and saved-set user ID,
 721    of the calling process.  */
 722 extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid)
 723      __THROW;
 724
 725 /* Fetch the real group ID, effective group ID, and saved-set group ID,
 726    of the calling process.  */
 727 extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid)
 728      __THROW;
 729
 730 /* Set the real user ID, effective user ID, and saved-set user ID,
 731    of the calling process to RUID, EUID, and SUID, respectively.  */
 732 extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid)
 733      __THROW;
 734
 735 /* Set the real group ID, effective group ID, and saved-set group ID,
 736    of the calling process to RGID, EGID, and SGID, respectively.  */
 737 extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid)
 738      __THROW;
 739 #endif
 740
 741
 742 /* Clone the calling process, creating an exact copy.
 743    Return -1 for errors, 0 to the new process,
 744    and the process ID of the new process to the old process.  */
 745 extern __pid_t fork (void) __THROW;
 746
 747 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 748 /* Clone the calling process, but without copying the whole address space.
 749    The calling process is suspended until the new process exits or is
 750    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
 751    and the process ID of the new process to the old process.  */
 752 extern __pid_t vfork (void) __THROW;
 753 #endif /* Use BSD. */
 754
 755
 756 /* Return the pathname of the terminal FD is open on, or NULL on errors.
 757    The returned storage is good only until the next call to this function.  */
 758 extern char *ttyname (int __fd) __THROW;
 759
 760 /* Store at most BUFLEN characters of the pathname of the terminal FD is
 761    open on in BUF.  Return 0 on success, otherwise an error number.  */
 762 extern int ttyname_r (int __fd, char *__buf, size_t __buflen)
 763      __THROW __nonnull ((2)) __wur;
 764
 765 /* Return 1 if FD is a valid descriptor associated
 766    with a terminal, zero if not.  */
 767 extern int isatty (int __fd) __THROW;
 768
 769 #if defined __USE_BSD \
 770     || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)
 771 /* Return the index into the active-logins file (utmp) for
 772    the controlling terminal.  */
 773 extern int ttyslot (void) __THROW;
 774 #endif
 775
 776
 777 /* Make a link to FROM named TO.  */
 778 extern int link (__const char *__from, __const char *__to)
 779      __THROW __nonnull ((1, 2)) __wur;
 780
 781 #ifdef __USE_ATFILE
 782 /* Like link but relative paths in TO and FROM are interpreted relative
 783    to FROMFD and TOFD respectively.  */
 784 extern int linkat (int __fromfd, __const char *__from, int __tofd,
 785                    __const char *__to, int __flags)
 786      __THROW __nonnull ((2, 4)) __wur;
 787 #endif
 788
 789 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 790 /* Make a symbolic link to FROM named TO.  */
 791 extern int symlink (__const char *__from, __const char *__to)
 792      __THROW __nonnull ((1, 2)) __wur;
 793
 794 /* Read the contents of the symbolic link PATH into no more than
 795    LEN bytes of BUF.  The contents are not null-terminated.
 796    Returns the number of characters read, or -1 for errors.  */
 797 extern ssize_t readlink (__const char *__restrict __path,
 798                          char *__restrict __buf, size_t __len)
 799      __THROW __nonnull ((1, 2)) __wur;
 800 #endif /* Use BSD.  */
 801
 802 #ifdef __USE_ATFILE
 803 /* Like symlink but a relative path in TO is interpreted relative to TOFD.  */
 804 extern int symlinkat (__const char *__from, int __tofd,
 805                       __const char *__to) __THROW __nonnull ((1, 3)) __wur;
 806
 807 /* Like readlink but a relative PATH is interpreted relative to FD.  */
 808 extern ssize_t readlinkat (int __fd, __const char *__restrict __path,
 809                            char *__restrict __buf, size_t __len)
 810      __THROW __nonnull ((2, 3)) __wur;
 811 #endif
 812
 813 /* Remove the link NAME.  */
 814 extern int unlink (__const char *__name) __THROW __nonnull ((1));
 815
 816 #ifdef __USE_ATFILE
 817 /* Remove the link NAME relative to FD.  */
 818 extern int unlinkat (int __fd, __const char *__name, int __flag)
 819      __THROW __nonnull ((2));
 820 #endif
 821
 822 /* Remove the directory PATH.  */
 823 extern int rmdir (__const char *__path) __THROW __nonnull ((1));
 824
 825
 826 /* Return the foreground process group ID of FD.  */
 827 extern __pid_t tcgetpgrp (int __fd) __THROW;
 828
 829 /* Set the foreground process group ID of FD set PGRP_ID.  */
 830 extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
 831
 832
 833 /* Return the login name of the user.
 834
 835    This function is a possible cancellation points and therefore not
 836    marked with __THROW.  */
 837 extern char *getlogin (void);
 838 #if defined __USE_REENTRANT || defined __USE_POSIX199506
 839 /* Return at most NAME_LEN characters of the login name of the user in NAME.
 840    If it cannot be determined or some other error occurred, return the error
 841    code.  Otherwise return 0.
 842
 843    This function is a possible cancellation points and therefore not
 844    marked with __THROW.  */
 845 extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1));
 846 #endif
 847
 848 #ifdef  __USE_BSD
 849 /* Set the login name returned by `getlogin'.  */
 850 extern int setlogin (__const char *__name) __THROW __nonnull ((1));
 851 #endif
 852
 853
 854 #ifdef  __USE_POSIX2
 855 /* Get definitions and prototypes for functions to process the
 856    arguments in ARGV (ARGC of them, minus the program name) for
 857    options given in OPTS.  */
 858 # define __need_getopt
 859 # include <getopt.h>
 860 #endif
 861
 862
 863 #if defined __USE_BSD || defined __USE_UNIX98
 864 /* Put the name of the current host in no more than LEN bytes of NAME.
 865    The result is null-terminated if LEN is large enough for the full
 866    name and the terminator.  */
 867 extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1));
 868 #endif
 869
 870
 871 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
 872 /* Set the name of the current host to NAME, which is LEN bytes long.
 873    This call is restricted to the super-user.  */
 874 extern int sethostname (__const char *__name, size_t __len)
 875      __THROW __nonnull ((1)) __wur;
 876
 877 /* Set the current machine's Internet number to ID.
 878    This call is restricted to the super-user.  */
 879 extern int sethostid (long int __id) __THROW __wur;
 880
 881
 882 /* Get and set the NIS (aka YP) domain name, if any.
 883    Called just like `gethostname' and `sethostname'.
 884    The NIS domain name is usually the empty string when not using NIS.  */
 885 extern int getdomainname (char *__name, size_t __len)
 886      __THROW __nonnull ((1)) __wur;
 887 extern int setdomainname (__const char *__name, size_t __len)
 888      __THROW __nonnull ((1)) __wur;
 889
 890
 891 /* Revoke access permissions to all processes currently communicating
 892    with the control terminal, and then send a SIGHUP signal to the process
 893    group of the control terminal.  */
 894 extern int vhangup (void) __THROW;
 895
 896 /* Revoke the access of all descriptors currently open on FILE.  */
 897 extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur;
 898
 899
 900 /* Enable statistical profiling, writing samples of the PC into at most
 901    SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
 902    is enabled, the system examines the user PC and increments
 903    SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536].  If SCALE is zero,
 904    disable profiling.  Returns zero on success, -1 on error.  */
 905 extern int profil (unsigned short int *__sample_buffer, size_t __size,
 906                    size_t __offset, unsigned int __scale)
 907      __THROW __nonnull ((1));
 908
 909
 910 /* Turn accounting on if NAME is an existing file.  The system will then write
 911    a record for each process as it terminates, to this file.  If NAME is NULL,
 912    turn accounting off.  This call is restricted to the super-user.  */
 913 extern int acct (__const char *__name) __THROW;
 914
 915
 916 /* Successive calls return the shells listed in `/etc/shells'.  */
 917 extern char *getusershell (void) __THROW;
 918 extern void endusershell (void) __THROW; /* Discard cached info.  */
 919 extern void setusershell (void) __THROW; /* Rewind and re-read the file.  */
 920
 921
 922 /* Put the program in the background, and dissociate from the controlling
 923    terminal.  If NOCHDIR is zero, do `chdir ("/")'.  If NOCLOSE is zero,
 924    redirects stdin, stdout, and stderr to /dev/null.  */
 925 extern int daemon (int __nochdir, int __noclose) __THROW __wur;
 926 #endif /* Use BSD || X/Open.  */
 927
 928
 929 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
 930 /* Make PATH be the root directory (the starting point for absolute paths).
 931    This call is restricted to the super-user.  */
 932 extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur;
 933
 934 /* Prompt with PROMPT and read a string from the terminal without echoing.
 935    Uses /dev/tty if possible; otherwise stderr and stdin.  */
 936 extern char *getpass (__const char *__prompt) __nonnull ((1));
 937 #endif /* Use BSD || X/Open.  */
 938
 939
 940 #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K
 941 /* Make all changes done to FD actually appear on disk.
 942
 943    This function is a cancellation point and therefore not marked with
 944    __THROW.  */
 945 extern int fsync (int __fd);
 946 #endif /* Use BSD || X/Open || Unix98.  */
 947
 948
 949 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 950
 951 /* Return identifier for the current host.  */
 952 extern long int gethostid (void);
 953
 954 /* Make all changes done to all files actually appear on disk.  */
 955 extern void sync (void) __THROW;
 956
 957
 958 /* Return the number of bytes in a page.  This is the system's page size,
 959    which is not necessarily the same as the hardware page size.  */
 960 extern int getpagesize (void)  __THROW __attribute__ ((__const__));
 961
 962
 963 /* Return the maximum number of file descriptors
 964    the current process could possibly have.  */
 965 extern int getdtablesize (void) __THROW;
 966
 967
 968 /* Truncate FILE to LENGTH bytes.  */
 969 # ifndef __USE_FILE_OFFSET64
 970 extern int truncate (__const char *__file, __off_t __length)
 971      __THROW __nonnull ((1)) __wur;
 972 # else
 973 #  ifdef __REDIRECT_NTH
 974 extern int __REDIRECT_NTH (truncate,
 975                            (__const char *__file, __off64_t __length),
 976                            truncate64) __nonnull ((1)) __wur;
 977 #  else
 978 #   define truncate truncate64
 979 #  endif
 980 # endif
 981 # ifdef __USE_LARGEFILE64
 982 extern int truncate64 (__const char *__file, __off64_t __length)
 983      __THROW __nonnull ((1)) __wur;
 984 # endif
 985
 986 #endif /* Use BSD || X/Open Unix.  */
 987
 988 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 989
 990 /* Truncate the file FD is open on to LENGTH bytes.  */
 991 # ifndef __USE_FILE_OFFSET64
 992 extern int ftruncate (int __fd, __off_t __length) __THROW __wur;
 993 # else
 994 #  ifdef __REDIRECT_NTH
 995 extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length),
 996                            ftruncate64) __wur;
 997 #  else
 998 #   define ftruncate ftruncate64
 999 #  endif
1000 # endif
1001 # ifdef __USE_LARGEFILE64
1002 extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur;
1003 # endif
1004
1005 #endif /* Use BSD || X/Open Unix || POSIX 2003.  */
1006
1007
1008 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
1009
1010 /* Set the end of accessible data space (aka "the break") to ADDR.
1011    Returns zero on success and -1 for errors (with errno set).  */
1012 extern int brk (void *__addr) __THROW __wur;
1013
1014 /* Increase or decrease the end of accessible data space by DELTA bytes.
1015    If successful, returns the address the previous end of data space
1016    (i.e. the beginning of the new space, if DELTA > 0);
1017    returns (void *) -1 for errors (with errno set).  */
1018 extern void *sbrk (intptr_t __delta) __THROW;
1019 #endif
1020
1021
1022 #ifdef __USE_MISC
1023 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
1024    This is completely system-dependent, and not often useful.
1025
1026    In Unix, `syscall' sets `errno' for all errors and most calls return -1
1027    for errors; in many systems you cannot pass arguments or get return
1028    values for all system calls (`pipe', `fork', and `getppid' typically
1029    among them).
1030
1031    In Mach, all system calls take normal arguments and always return an
1032    error code (zero for success).  */
1033 extern long int syscall (long int __sysno, ...) __THROW;
1034
1035 #endif  /* Use misc.  */
1036
1037
1038 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
1039 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
1040    files consistent.  Some systems have them there and some here, and some
1041    software depends on the macros being defined without including both.  */
1042
1043 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
1044    LEN is always relative to the current file position.
1045    The CMD argument is one of the following.
1046
1047    This function is a cancellation point and therefore not marked with
1048    __THROW.  */
1049
1050 # define F_ULOCK 0      /* Unlock a previously locked region.  */
1051 # define F_LOCK  1      /* Lock a region for exclusive use.  */
1052 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
1053 # define F_TEST  3      /* Test a region for other processes locks.  */
1054
1055 # ifndef __USE_FILE_OFFSET64
1056 extern int lockf (int __fd, int __cmd, __off_t __len) __wur;
1057 # else
1058 #  ifdef __REDIRECT
1059 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len),
1060                        lockf64) __wur;
1061 #  else
1062 #   define lockf lockf64
1063 #  endif
1064 # endif
1065 # ifdef __USE_LARGEFILE64
1066 extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur;
1067 # endif
1068 #endif /* Use misc and F_LOCK not already defined.  */
1069
1070
1071 #ifdef __USE_GNU
1072
1073 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
1074    set to EINTR.  */
1075
1076 # define TEMP_FAILURE_RETRY(expression) \
1077   (__extension__                                                              \
1078     ({ long int __result;                                                     \
1079        do __result = (long int) (expression);                                 \
1080        while (__result == -1L && errno == EINTR);                             \
1081        __result; }))
1082 #endif
1083
1084 #if defined __USE_POSIX199309 || defined __USE_UNIX98
1085 /* Synchronize at least the data part of a file with the underlying
1086    media.  */
1087 extern int fdatasync (int __fildes);
1088 #endif /* Use POSIX199309 */
1089
1090
1091 /* XPG4.2 specifies that prototypes for the encryption functions must
1092    be defined here.  */
1093 #ifdef  __USE_XOPEN
1094 /* Encrypt at most 8 characters from KEY using salt to perturb DES.  */
1095 extern char *crypt (__const char *__key, __const char *__salt)
1096      __THROW __nonnull ((1, 2));
1097
1098 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
1099    block in place.  */
1100 extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
1101
1102
1103 /* Swab pairs bytes in the first N bytes of the area pointed to by
1104    FROM and copy the result to TO.  The value of TO must not be in the
1105    range [FROM - N + 1, FROM - 1].  If N is odd the first byte in FROM
1106    is without partner.  */
1107 extern void swab (__const void *__restrict __from, void *__restrict __to,
1108                   ssize_t __n) __THROW __nonnull ((1, 2));
1109 #endif
1110
1111
1112 /* The Single Unix specification demands this prototype to be here.
1113    It is also found in <stdio.h>.  */
1114 #ifdef __USE_XOPEN
1115 /* Return the name of the controlling terminal.  */
1116 extern char *ctermid (char *__s) __THROW;
1117 #endif
1118
1119
1120 /* Define some macros helping to catch buffer overflows.  */
1121 #if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline
1122 # include <bits/unistd.h>
1123 #endif
1124
1125 __END_DECLS
1126
1127 #endif /* unistd.h  */