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 #ifdef __USE_UNIX98
 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
 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 0 /*def __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 #endif
 320
 321 #if defined __USE_BSD && !defined L_SET
 322 /* Old BSD names for the same constants; just for compatibility.  */
 323 # define L_SET          SEEK_SET
 324 # define L_INCR         SEEK_CUR
 325 # define L_XTND         SEEK_END
 326 #endif
 327
 328
 329 /* Move FD's file position to OFFSET bytes from the
 330    beginning of the file (if WHENCE is SEEK_SET),
 331    the current position (if WHENCE is SEEK_CUR),
 332    or the end of the file (if WHENCE is SEEK_END).
 333    Return the new file position.  */
 334 #ifndef __USE_FILE_OFFSET64
 335 extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;
 336 # ifdef _LIBC
 337 extern __typeof(lseek) __lseek_nocancel attribute_hidden;
 338 libc_hidden_proto(lseek)
 339 # endif
 340 #else
 341 # ifdef __REDIRECT_NTH
 342 extern __off64_t __REDIRECT_NTH (lseek,
 343                                  (int __fd, __off64_t __offset, int __whence),
 344                                  lseek64);
 345 # else
 346 #  define lseek lseek64
 347 # endif
 348 #endif
 349 #ifdef __USE_LARGEFILE64
 350 extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
 351      __THROW;
 352 # ifdef _LIBC
 353 extern __typeof(lseek64) __lseek64_nocancel attribute_hidden;
 354 libc_hidden_proto(lseek64)
 355 # endif
 356 #endif
 357
 358 /* Close the file descriptor FD.
 359
 360    This function is a cancellation point and therefore not marked with
 361    __THROW.  */
 362 extern int close (int __fd);
 363 #ifdef _LIBC
 364 extern __typeof(close) __close_nocancel attribute_hidden;
 365 extern void __close_nocancel_no_status(int) attribute_hidden;
 366 libc_hidden_proto(close)
 367 #endif
 368
 369 /* Read NBYTES into BUF from FD.  Return the
 370    number read, -1 for errors or 0 for EOF.
 371
 372    This function is a cancellation point and therefore not marked with
 373    __THROW.  */
 374 extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;
 375 #ifdef _LIBC
 376 extern __typeof(read) __read_nocancel attribute_hidden;
 377 libc_hidden_proto(read)
 378 #endif
 379
 380 /* Write N bytes of BUF to FD.  Return the number written, or -1.
 381
 382    This function is a cancellation point and therefore not marked with
 383    __THROW.  */
 384 extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur;
 385 #ifdef _LIBC
 386 extern __typeof(write) __write_nocancel attribute_hidden;
 387 libc_hidden_proto(write)
 388 #endif
 389
 390 #ifdef __USE_UNIX98
 391 # ifndef __USE_FILE_OFFSET64
 392 /* Read NBYTES into BUF from FD at the given position OFFSET without
 393    changing the file pointer.  Return the number read, -1 for errors
 394    or 0 for EOF.
 395
 396    This function is a cancellation point and therefore not marked with
 397    __THROW.  */
 398 extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
 399                       __off_t __offset) __wur;
 400
 401 /* Write N bytes of BUF to FD at the given position OFFSET without
 402    changing the file pointer.  Return the number written, or -1.
 403
 404    This function is a cancellation point and therefore not marked with
 405    __THROW.  */
 406 extern ssize_t pwrite (int __fd, const void *__buf, size_t __n,
 407                        __off_t __offset) __wur;
 408 # else
 409 #  ifdef __REDIRECT
 410 extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
 411                                    __off64_t __offset),
 412                            pread64) __wur;
 413 extern ssize_t __REDIRECT (pwrite, (int __fd, const void *__buf,
 414                                     size_t __nbytes, __off64_t __offset),
 415                            pwrite64) __wur;
 416 #  else
 417 #   define pread pread64
 418 #   define pwrite pwrite64
 419 #  endif
 420 # endif
 421
 422 # ifdef __USE_LARGEFILE64
 423 /* Read NBYTES into BUF from FD at the given position OFFSET without
 424    changing the file pointer.  Return the number read, -1 for errors
 425    or 0 for EOF.  */
 426 extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
 427                         __off64_t __offset) __wur;
 428 /* Write N bytes of BUF to FD at the given position OFFSET without
 429    changing the file pointer.  Return the number written, or -1.  */
 430 extern ssize_t pwrite64 (int __fd, const void *__buf, size_t __n,
 431                          __off64_t __offset) __wur;
 432 # endif
 433 #endif
 434
 435 /* Create a one-way communication channel (pipe).
 436    If successful, two file descriptors are stored in PIPEDES;
 437    bytes written on PIPEDES[1] can be read from PIPEDES[0].
 438    Returns 0 if successful, -1 if not.  */
 439 extern int pipe (int __pipedes[2]) __THROW __wur;
 440 libc_hidden_proto(pipe)
 441
 442 #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
 443 /* Same as pipe but apply flags passed in FLAGS to the new file
 444    descriptors.  */
 445 extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;
 446 libc_hidden_proto(pipe2)
 447 #endif
 448
 449 /* Schedule an alarm.  In SECONDS seconds, the process will get a SIGALRM.
 450    If SECONDS is zero, any currently scheduled alarm will be cancelled.
 451    The function returns the number of seconds remaining until the last
 452    alarm scheduled would have signaled, or zero if there wasn't one.
 453    There is no return value to indicate an error, but you can set `errno'
 454    to 0 and check its value after calling `alarm', and this might tell you.
 455    The signal may come late due to processor scheduling.  */
 456 extern unsigned int alarm (unsigned int __seconds) __THROW;
 457 libc_hidden_proto(alarm)
 458
 459 /* Make the process sleep for SECONDS seconds, or until a signal arrives
 460    and is not ignored.  The function returns the number of seconds less
 461    than SECONDS which it actually slept (thus zero if it slept the full time).
 462    If a signal handler does a `longjmp' or modifies the handling of the
 463    SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
 464    signal afterwards is undefined.  There is no return value to indicate
 465    error, but if `sleep' returns SECONDS, it probably didn't work.
 466
 467    This function is a cancellation point and therefore not marked with
 468    __THROW.  */
 469 extern unsigned int sleep (unsigned int __seconds);
 470 libc_hidden_proto(sleep)
 471
 472 #if (defined __USE_BSD || defined __USE_XOPEN_EXTENDED) \
 473         && defined __UCLIBC_SUSV3_LEGACY__
 474 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
 475    microseconds.  If INTERVAL is nonzero, when the alarm goes off, the
 476    timer is reset to go off every INTERVAL microseconds thereafter.
 477    Returns the number of microseconds remaining before the alarm.  */
 478 extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)
 479      __THROW;
 480
 481 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
 482    or ignored.
 483
 484    This function is a cancellation point and therefore not marked with
 485    __THROW.  */
 486 extern int usleep (__useconds_t __useconds);
 487 #endif
 488
 489
 490 /* Suspend the process until a signal arrives.
 491    This always returns -1 and sets `errno' to EINTR.
 492
 493    This function is a cancellation point and therefore not marked with
 494    __THROW.  */
 495 extern int pause (void);
 496
 497
 498 /* Change the owner and group of FILE.  */
 499 extern int chown (const char *__file, __uid_t __owner, __gid_t __group)
 500      __THROW __nonnull ((1)) __wur;
 501 libc_hidden_proto(chown)
 502
 503 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 504 /* Change the owner and group of the file that FD is open on.  */
 505 extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;
 506
 507
 508 /* Change owner and group of FILE, if it is a symbolic
 509    link the ownership of the symbolic link is changed.  */
 510 extern int lchown (const char *__file, __uid_t __owner, __gid_t __group)
 511      __THROW __nonnull ((1)) __wur;
 512
 513 #endif /* Use BSD || X/Open Unix.  */
 514
 515 #ifdef __USE_ATFILE
 516 /* Change the owner and group of FILE relative to the directory FD is open
 517    on.  */
 518 extern int fchownat (int __fd, const char *__file, __uid_t __owner,
 519                      __gid_t __group, int __flag)
 520      __THROW __nonnull ((2)) __wur;
 521 libc_hidden_proto(fchownat)
 522 #endif /* Use GNU.  */
 523
 524 /* Change the process's working directory to PATH.  */
 525 extern int chdir (const char *__path) __THROW __nonnull ((1)) __wur;
 526 libc_hidden_proto(chdir)
 527
 528 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 529 /* Change the process's working directory to the one FD is open on.  */
 530 extern int fchdir (int __fd) __THROW __wur;
 531 libc_hidden_proto(fchdir)
 532 #endif
 533
 534 /* Get the pathname of the current working directory,
 535    and put it in SIZE bytes of BUF.  Returns NULL if the
 536    directory couldn't be determined or SIZE was too small.
 537    If successful, returns BUF.  In GNU, if BUF is NULL,
 538    an array is allocated with `malloc'; the array is SIZE
 539    bytes long, unless SIZE == 0, in which case it is as
 540    big as necessary.  */
 541 extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
 542 libc_hidden_proto(getcwd)
 543
 544 #ifdef  __USE_GNU
 545 /* Return a malloc'd string containing the current directory name.
 546    If the environment variable `PWD' is set, and its value is correct,
 547    that value is used.  */
 548 extern char *get_current_dir_name (void) __THROW;
 549 #endif
 550
 551 #if 0 /*defined __USE_BSD || defined __USE_XOPEN_EXTENDED*/
 552 /* Put the absolute pathname of the current working directory in BUF.
 553    If successful, return BUF.  If not, put an error message in
 554    BUF and return NULL.  BUF should be at least PATH_MAX bytes long.  */
 555 extern char *getwd (char *__buf)
 556      __THROW __nonnull ((1)) __attribute_deprecated__ __wur;
 557 #endif
 558
 559
 560 /* Duplicate FD, returning a new file descriptor on the same file.  */
 561 extern int dup (int __fd) __THROW __wur;
 562
 563 /* Duplicate FD to FD2, closing FD2 and making it open on the same file.  */
 564 extern int dup2 (int __fd, int __fd2) __THROW;
 565 libc_hidden_proto(dup2)
 566
 567 #ifdef __USE_GNU
 568 /* Duplicate FD to FD2, closing FD2 and making it open on the same
 569    file while setting flags according to FLAGS.  */
 570 extern int dup3 (int __fd, int __fd2, int __flags) __THROW;
 571 libc_hidden_proto(dup3)
 572 #endif
 573
 574 /* NULL-terminated array of "NAME=VALUE" environment variables.  */
 575 extern char **__environ;
 576 #ifdef __USE_GNU
 577 extern char **environ;
 578 #endif
 579
 580
 581 /* Replace the current process, executing PATH with arguments ARGV and
 582    environment ENVP.  ARGV and ENVP are terminated by NULL pointers.  */
 583 extern int execve (const char *__path, char *const __argv[],
 584                    char *const __envp[]) __THROW __nonnull ((1));
 585 libc_hidden_proto(execve)
 586
 587 #if 0 /*def __USE_XOPEN2K8*/
 588 /* Execute the file FD refers to, overlaying the running program image.
 589    ARGV and ENVP are passed to the new program, as for `execve'.  */
 590 extern int fexecve (int __fd, char *const __argv[], char *const __envp[])
 591      __THROW;
 592 #endif
 593
 594
 595 /* Execute PATH with arguments ARGV and environment from `environ'.  */
 596 extern int execv (const char *__path, char *const __argv[])
 597      __THROW __nonnull ((1));
 598 libc_hidden_proto(execv)
 599
 600 /* Execute PATH with all arguments after PATH until a NULL pointer,
 601    and the argument after that for environment.  */
 602 extern int execle (const char *__path, const char *__arg, ...)
 603      __THROW __nonnull ((1));
 604 libc_hidden_proto(execle)
 605
 606 /* Execute PATH with all arguments after PATH until
 607    a NULL pointer and environment from `environ'.  */
 608 extern int execl (const char *__path, const char *__arg, ...)
 609      __THROW __nonnull ((1));
 610 libc_hidden_proto(execl)
 611
 612 /* Execute FILE, searching in the `PATH' environment variable if it contains
 613    no slashes, with arguments ARGV and environment from `environ'.  */
 614 extern int execvp (const char *__file, char *const __argv[])
 615      __THROW __nonnull ((1));
 616 libc_hidden_proto(execvp)
 617
 618 /* Execute FILE, searching in the `PATH' environment variable if
 619    it contains no slashes, with all arguments after FILE until a
 620    NULL pointer and environment from `environ'.  */
 621 extern int execlp (const char *__file, const char *__arg, ...)
 622      __THROW __nonnull ((1));
 623 libc_hidden_proto(execlp)
 624
 625 #ifdef __USE_GNU
 626 /* Execute FILE, searching in the `PATH' environment variable if it contains
 627    no slashes, with arguments ARGV and environment from a pointer */
 628 extern int execvpe (__const char *__file, char *__const __argv[], char *__const __envp[])
 629      __THROW __nonnull ((1));
 630 libc_hidden_proto(execvpe)
 631 #endif
 632
 633
 634 #if defined __USE_MISC || defined __USE_XOPEN
 635 /* Add INC to priority of the current process.  */
 636 extern int nice (int __inc) __THROW __wur;
 637 #endif
 638
 639
 640 /* Terminate program execution with the low-order 8 bits of STATUS.  */
 641 extern void _exit (int __status) __attribute__ ((__noreturn__));
 642 libc_hidden_proto(_exit)
 643
 644
 645 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
 646    the `_SC_*' symbols for the NAME argument to `sysconf';
 647    and the `_CS_*' symbols for the NAME argument to `confstr'.  */
 648 #include <bits/confname.h>
 649
 650 /* Get file-specific configuration information about PATH.  */
 651 extern long int pathconf (const char *__path, int __name)
 652      __THROW __nonnull ((1));
 653
 654 /* Get file-specific configuration about descriptor FD.  */
 655 extern long int fpathconf (int __fd, int __name) __THROW;
 656
 657 /* Get the value of the system variable NAME.  */
 658 extern long int sysconf (int __name) __THROW;
 659 libc_hidden_proto(sysconf)
 660
 661 #ifdef  __USE_POSIX2
 662 /* Get the value of the string-valued system variable NAME.  */
 663 extern size_t confstr (int __name, char *__buf, size_t __len) __THROW;
 664 #endif
 665
 666
 667 /* Get the process ID of the calling process.  */
 668 extern __pid_t getpid (void) __THROW;
 669 libc_hidden_proto(getpid)
 670
 671 /* Get the process ID of the calling process's parent.  */
 672 extern __pid_t getppid (void) __THROW;
 673
 674 /* Get the process group ID of the calling process.
 675    This function is different on old BSD. */
 676 #ifndef __FAVOR_BSD
 677 extern __pid_t getpgrp (void) __THROW;
 678 #else
 679 # ifdef __REDIRECT_NTH
 680 extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid);
 681 # else
 682 #  define getpgrp __getpgid
 683 # endif
 684 #endif
 685
 686 /* Get the process group ID of process PID.  */
 687 extern __pid_t __getpgid (__pid_t __pid) __THROW;
 688 #ifdef __USE_XOPEN_EXTENDED
 689 extern __pid_t getpgid (__pid_t __pid) __THROW;
 690 #endif
 691
 692
 693 /* Set the process group ID of the process matching PID to PGID.
 694    If PID is zero, the current process's process group ID is set.
 695    If PGID is zero, the process ID of the process is used.  */
 696 extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
 697 libc_hidden_proto(setpgid)
 698
 699 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 700 /* Both System V and BSD have `setpgrp' functions, but with different
 701    calling conventions.  The BSD function is the same as POSIX.1 `setpgid'
 702    (above).  The System V function takes no arguments and puts the calling
 703    process in its on group like `setpgid (0, 0)'.
 704
 705    New programs should always use `setpgid' instead.
 706
 707    The default in GNU is to provide the System V function.  The BSD
 708    function is available under -D_BSD_SOURCE.  */
 709
 710 # ifndef __FAVOR_BSD
 711
 712 /* Set the process group ID of the calling process to its own PID.
 713    This is exactly the same as `setpgid (0, 0)'.  */
 714 extern int setpgrp (void) __THROW;
 715
 716 # else
 717
 718 /* Another name for `setpgid' (above).  */
 719 #  ifdef __REDIRECT_NTH
 720 extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid);
 721 #  else
 722 #   define setpgrp setpgid
 723 #  endif
 724
 725 # endif /* Favor BSD.  */
 726 #endif  /* Use SVID or BSD.  */
 727
 728 /* Create a new session with the calling process as its leader.
 729    The process group IDs of the session and the calling process
 730    are set to the process ID of the calling process, which is returned.  */
 731 extern __pid_t setsid (void) __THROW;
 732 libc_hidden_proto(setsid)
 733
 734 #ifdef __USE_XOPEN_EXTENDED
 735 /* Return the session ID of the given process.  */
 736 extern __pid_t getsid (__pid_t __pid) __THROW;
 737 libc_hidden_proto(getsid)
 738 #endif
 739
 740 /* Get the real user ID of the calling process.  */
 741 extern __uid_t getuid (void) __THROW;
 742 libc_hidden_proto(getuid)
 743
 744 /* Get the effective user ID of the calling process.  */
 745 extern __uid_t geteuid (void) __THROW;
 746 libc_hidden_proto(geteuid)
 747
 748 /* Get the real group ID of the calling process.  */
 749 extern __gid_t getgid (void) __THROW;
 750 libc_hidden_proto(getgid)
 751
 752 /* Get the effective group ID of the calling process.  */
 753 extern __gid_t getegid (void) __THROW;
 754 libc_hidden_proto(getegid)
 755
 756 /* If SIZE is zero, return the number of supplementary groups
 757    the calling process is in.  Otherwise, fill in the group IDs
 758    of its supplementary groups in LIST and return the number written.  */
 759 extern int getgroups (int __size, __gid_t __list[]) __THROW __wur;
 760 libc_hidden_proto(getgroups)
 761
 762 #if 0 /*def     __USE_GNU*/
 763 /* Return nonzero iff the calling process is in group GID.  */
 764 extern int group_member (__gid_t __gid) __THROW;
 765 #endif
 766
 767 /* Set the user ID of the calling process to UID.
 768    If the calling process is the super-user, set the real
 769    and effective user IDs, and the saved set-user-ID to UID;
 770    if not, the effective user ID is set to UID.  */
 771 extern int setuid (__uid_t __uid) __THROW;
 772
 773 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 774 /* Set the real user ID of the calling process to RUID,
 775    and the effective user ID of the calling process to EUID.  */
 776 extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW;
 777 libc_hidden_proto(setreuid)
 778 #endif
 779
 780 #if defined __USE_BSD || defined __USE_XOPEN2K
 781 /* Set the effective user ID of the calling process to UID.  */
 782 extern int seteuid (__uid_t __uid) __THROW;
 783 libc_hidden_proto(seteuid)
 784 #endif /* Use BSD.  */
 785
 786 /* Set the group ID of the calling process to GID.
 787    If the calling process is the super-user, set the real
 788    and effective group IDs, and the saved set-group-ID to GID;
 789    if not, the effective group ID is set to GID.  */
 790 extern int setgid (__gid_t __gid) __THROW;
 791
 792 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 793 /* Set the real group ID of the calling process to RGID,
 794    and the effective group ID of the calling process to EGID.  */
 795 extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW;
 796 libc_hidden_proto(setregid)
 797 #endif
 798
 799 #if defined __USE_BSD || defined __USE_XOPEN2K
 800 /* Set the effective group ID of the calling process to GID.  */
 801 extern int setegid (__gid_t __gid) __THROW;
 802 #endif /* Use BSD.  */
 803
 804 #ifdef __USE_GNU
 805 /* Fetch the real user ID, effective user ID, and saved-set user ID,
 806    of the calling process.  */
 807 extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid)
 808      __THROW;
 809
 810 /* Fetch the real group ID, effective group ID, and saved-set group ID,
 811    of the calling process.  */
 812 extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid)
 813      __THROW;
 814
 815 #if defined __UCLIBC_LINUX_SPECIFIC__
 816 /* Set the real user ID, effective user ID, and saved-set user ID,
 817    of the calling process to RUID, EUID, and SUID, respectively.  */
 818 extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid)
 819      __THROW;
 820 libc_hidden_proto(setresuid)
 821 #endif
 822
 823 /* Set the real group ID, effective group ID, and saved-set group ID,
 824    of the calling process to RGID, EGID, and SGID, respectively.  */
 825 extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid)
 826      __THROW;
 827 libc_hidden_proto(setresgid)
 828 #endif
 829
 830
 831 #if defined __UCLIBC_HAS_STUBS__ || defined __ARCH_USE_MMU__
 832 /* Clone the calling process, creating an exact copy.
 833    Return -1 for errors, 0 to the new process,
 834    and the process ID of the new process to the old process.  */
 835 extern __pid_t fork (void) __THROW;
 836 # ifdef _LIBC
 837 # ifdef __UCLIBC_HAS_THREADS__
 838 extern __typeof(fork) __libc_fork;
 839 # endif
 840 libc_hidden_proto(fork)
 841 # endif
 842 #endif
 843
 844 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 845 /* Clone the calling process, but without copying the whole address space.
 846    The calling process is suspended until the new process exits or is
 847    replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
 848    and the process ID of the new process to the old process.  */
 849 extern __pid_t vfork (void) __THROW;
 850 libc_hidden_proto(vfork)
 851 #endif /* Use BSD. */
 852
 853 #if 0 /* psm: seems unused , exit-thread.S is not compiled */
 854 /* Special exit function which only terminates the current thread.  */
 855 extern void __exit_thread (int val) __attribute__ ((__noreturn__));
 856 #endif
 857
 858 /* Return the pathname of the terminal FD is open on, or NULL on errors.
 859    The returned storage is good only until the next call to this function.  */
 860 extern char *ttyname (int __fd) __THROW;
 861
 862 /* Store at most BUFLEN characters of the pathname of the terminal FD is
 863    open on in BUF.  Return 0 on success, otherwise an error number.  */
 864 extern int ttyname_r (int __fd, char *__buf, size_t __buflen)
 865      __THROW __nonnull ((2)) __wur;
 866 libc_hidden_proto(ttyname_r)
 867
 868 /* Return 1 if FD is a valid descriptor associated
 869    with a terminal, zero if not.  */
 870 extern int isatty (int __fd) __THROW;
 871 libc_hidden_proto(isatty)
 872
 873 #if 0 /*defined __USE_BSD \
 874     || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)*/
 875 /* Return the index into the active-logins file (utmp) for
 876    the controlling terminal.  */
 877 extern int ttyslot (void) __THROW;
 878 #endif
 879
 880
 881 /* Make a link to FROM named TO.  */
 882 extern int link (const char *__from, const char *__to)
 883      __THROW __nonnull ((1, 2)) __wur;
 884
 885 #ifdef __USE_ATFILE
 886 /* Like link but relative paths in TO and FROM are interpreted relative
 887    to FROMFD and TOFD respectively.  */
 888 extern int linkat (int __fromfd, const char *__from, int __tofd,
 889                    const char *__to, int __flags)
 890      __THROW __nonnull ((2, 4)) __wur;
 891 libc_hidden_proto(linkat)
 892 #endif
 893
 894 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 895 /* Make a symbolic link to FROM named TO.  */
 896 extern int symlink (const char *__from, const char *__to)
 897      __THROW __nonnull ((1, 2)) __wur;
 898
 899 /* Read the contents of the symbolic link PATH into no more than
 900    LEN bytes of BUF.  The contents are not null-terminated.
 901    Returns the number of characters read, or -1 for errors.  */
 902 extern ssize_t readlink (const char *__restrict __path,
 903                          char *__restrict __buf, size_t __len)
 904      __THROW __nonnull ((1, 2)) __wur;
 905 libc_hidden_proto(readlink)
 906 #endif /* Use BSD.  */
 907
 908 #ifdef __USE_ATFILE
 909 /* Like symlink but a relative path in TO is interpreted relative to TOFD.  */
 910 extern int symlinkat (const char *__from, int __tofd,
 911                       const char *__to) __THROW __nonnull ((1, 3)) __wur;
 912 libc_hidden_proto(symlinkat)
 913
 914 /* Like readlink but a relative PATH is interpreted relative to FD.  */
 915 extern ssize_t readlinkat (int __fd, const char *__restrict __path,
 916                            char *__restrict __buf, size_t __len)
 917      __THROW __nonnull ((2, 3)) __wur;
 918 libc_hidden_proto(readlinkat)
 919 #endif
 920
 921 /* Remove the link NAME.  */
 922 extern int unlink (const char *__name) __THROW __nonnull ((1));
 923 libc_hidden_proto(unlink)
 924
 925 #ifdef __USE_ATFILE
 926 /* Remove the link NAME relative to FD.  */
 927 extern int unlinkat (int __fd, const char *__name, int __flag)
 928      __THROW __nonnull ((2));
 929 libc_hidden_proto(unlinkat)
 930 #endif
 931
 932 /* Remove the directory PATH.  */
 933 extern int rmdir (const char *__path) __THROW __nonnull ((1));
 934 libc_hidden_proto(rmdir)
 935
 936
 937 /* Return the foreground process group ID of FD.  */
 938 extern __pid_t tcgetpgrp (int __fd) __THROW;
 939 libc_hidden_proto(tcgetpgrp)
 940
 941 /* Set the foreground process group ID of FD set PGRP_ID.  */
 942 extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
 943
 944
 945 /* Return the login name of the user.
 946
 947    This function is a possible cancellation points and therefore not
 948    marked with __THROW.  */
 949 extern char *getlogin (void);
 950 libc_hidden_proto(getlogin)
 951 #if defined __USE_REENTRANT || defined __USE_POSIX199506
 952 /* Return at most NAME_LEN characters of the login name of the user in NAME.
 953    If it cannot be determined or some other error occurred, return the error
 954    code.  Otherwise return 0.
 955
 956    This function is a possible cancellation points and therefore not
 957    marked with __THROW.  */
 958 extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1));
 959 #endif
 960
 961 #if 0 /*def     __USE_BSD*/
 962 /* Set the login name returned by `getlogin'.  */
 963 extern int setlogin (const char *__name) __THROW __nonnull ((1));
 964 #endif
 965
 966
 967 #ifdef  __USE_POSIX2
 968 /* Get definitions and prototypes for functions to process the
 969    arguments in ARGV (ARGC of them, minus the program name) for
 970    options given in OPTS.  */
 971 # define __need_getopt
 972 /* keep this for uClibc in bits/, we need it when GNU_GETOPT is disabled */
 973 # include <bits/getopt.h>
 974 #endif
 975
 976
 977 #if defined __USE_BSD || defined __USE_UNIX98
 978 /* Put the name of the current host in no more than LEN bytes of NAME.
 979    The result is null-terminated if LEN is large enough for the full
 980    name and the terminator.  */
 981 extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1));
 982 libc_hidden_proto(gethostname)
 983 #endif
 984
 985
 986 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
 987 /* Set the name of the current host to NAME, which is LEN bytes long.
 988    This call is restricted to the super-user.  */
 989 extern int sethostname (const char *__name, size_t __len)
 990      __THROW __nonnull ((1)) __wur;
 991
 992 /* Set the current machine's Internet number to ID.
 993    This call is restricted to the super-user.  */
 994 extern int sethostid (long int __id) __THROW __wur;
 995
 996
 997 #if defined __UCLIBC_BSD_SPECIFIC__ || defined _LIBC
 998 /* Get and set the NIS (aka YP) domain name, if any.
 999    Called just like `gethostname' and `sethostname'.
1000    The NIS domain name is usually the empty string when not using NIS.  */
1001 extern int getdomainname (char *__name, size_t __len)
1002      __THROW __nonnull ((1)) __wur;
1003 libc_hidden_proto(getdomainname)
1004 #endif
1005 #if defined __UCLIBC_BSD_SPECIFIC__
1006 extern int setdomainname (const char *__name, size_t __len)
1007      __THROW __nonnull ((1)) __wur;
1008 #endif
1009
1010
1011 #if defined __UCLIBC_LINUX_SPECIFIC__
1012 /* Revoke access permissions to all processes currently communicating
1013    with the control terminal, and then send a SIGHUP signal to the process
1014    group of the control terminal.  */
1015 extern int vhangup (void) __THROW;
1016 #endif
1017
1018 #if 0
1019 /* Revoke the access of all descriptors currently open on FILE.  */
1020 extern int revoke (const char *__file) __THROW __nonnull ((1)) __wur;
1021
1022
1023 /* Enable statistical profiling, writing samples of the PC into at most
1024    SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
1025    is enabled, the system examines the user PC and increments
1026    SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536].  If SCALE is zero,
1027    disable profiling.  Returns zero on success, -1 on error.  */
1028 extern int profil (unsigned short int *__sample_buffer, size_t __size,
1029                    size_t __offset, unsigned int __scale)
1030      __THROW __nonnull ((1));
1031 #endif
1032
1033
1034 /* Turn accounting on if NAME is an existing file.  The system will then write
1035    a record for each process as it terminates, to this file.  If NAME is NULL,
1036    turn accounting off.  This call is restricted to the super-user.  */
1037 extern int acct (const char *__name) __THROW;
1038
1039
1040 /* Successive calls return the shells listed in `/etc/shells'.  */
1041 extern char *getusershell (void) __THROW;
1042 extern void endusershell (void) __THROW; /* Discard cached info.  */
1043 libc_hidden_proto(endusershell)
1044 extern void setusershell (void) __THROW; /* Rewind and re-read the file.  */
1045 libc_hidden_proto(setusershell)
1046
1047
1048 /* Put the program in the background, and dissociate from the controlling
1049    terminal.  If NOCHDIR is zero, do `chdir ("/")'.  If NOCLOSE is zero,
1050    redirects stdin, stdout, and stderr to /dev/null.  */
1051 extern int daemon (int __nochdir, int __noclose) __THROW __wur;
1052 #endif /* Use BSD || X/Open.  */
1053
1054
1055 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
1056 /* Make PATH be the root directory (the starting point for absolute paths).
1057    This call is restricted to the super-user.  */
1058 extern int chroot (const char *__path) __THROW __nonnull ((1)) __wur;
1059
1060 /* Prompt with PROMPT and read a string from the terminal without echoing.
1061    Uses /dev/tty if possible; otherwise stderr and stdin.  */
1062 extern char *getpass (const char *__prompt) __nonnull ((1));
1063 #endif /* Use BSD || X/Open.  */
1064
1065
1066 #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K
1067 /* Make all changes done to FD actually appear on disk.
1068
1069    This function is a cancellation point and therefore not marked with
1070    __THROW.  */
1071 extern int fsync (int __fd);
1072 #endif /* Use BSD || X/Open || Unix98.  */
1073
1074
1075 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
1076
1077 /* Return identifier for the current host.  */
1078 extern long int gethostid (void);
1079
1080 /* Make all changes done to all files actually appear on disk.  */
1081 extern void sync (void) __THROW;
1082
1083
1084 /* Return the number of bytes in a page.  This is the system's page size,
1085    which is not necessarily the same as the hardware page size.  */
1086 extern int getpagesize (void)  __THROW __attribute__ ((__const__));
1087 libc_hidden_proto(getpagesize)
1088
1089
1090 /* Return the maximum number of file descriptors
1091    the current process could possibly have.  */
1092 extern int getdtablesize (void) __THROW;
1093 libc_hidden_proto(getdtablesize)
1094
1095
1096 /* Truncate FILE to LENGTH bytes.  */
1097 # ifndef __USE_FILE_OFFSET64
1098 extern int truncate (const char *__file, __off_t __length)
1099      __THROW __nonnull ((1)) __wur;
1100 libc_hidden_proto(truncate)
1101 # else
1102 #  ifdef __REDIRECT_NTH
1103 extern int __REDIRECT_NTH (truncate,
1104                            (const char *__file, __off64_t __length),
1105                            truncate64) __nonnull ((1)) __wur;
1106 #  else
1107 #   define truncate truncate64
1108 #  endif
1109 # endif
1110 # ifdef __USE_LARGEFILE64
1111 extern int truncate64 (const char *__file, __off64_t __length)
1112      __THROW __nonnull ((1)) __wur;
1113 libc_hidden_proto(truncate64)
1114 # endif
1115
1116 #endif /* Use BSD || X/Open Unix.  */
1117
1118 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
1119
1120 /* Truncate the file FD is open on to LENGTH bytes.  */
1121 # ifndef __USE_FILE_OFFSET64
1122 extern int ftruncate (int __fd, __off_t __length) __THROW __wur;
1123 libc_hidden_proto(ftruncate)
1124 # else
1125 #  ifdef __REDIRECT_NTH
1126 extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length),
1127                            ftruncate64) __wur;
1128 #  else
1129 #   define ftruncate ftruncate64
1130 #  endif
1131 # endif
1132 # ifdef __USE_LARGEFILE64
1133 extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur;
1134 libc_hidden_proto(ftruncate64)
1135 # endif
1136
1137 #endif /* Use BSD || X/Open Unix || POSIX 2003.  */
1138
1139
1140 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
1141
1142 /* Set the end of accessible data space (aka "the break") to ADDR.
1143    Returns zero on success and -1 for errors (with errno set).  */
1144 extern int brk (void *__addr) __THROW __wur;
1145 libc_hidden_proto(brk)
1146
1147 /* Increase or decrease the end of accessible data space by DELTA bytes.
1148    If successful, returns the address the previous end of data space
1149    (i.e. the beginning of the new space, if DELTA > 0);
1150    returns (void *) -1 for errors (with errno set).  */
1151 extern void *sbrk (intptr_t __delta) __THROW;
1152 libc_hidden_proto(sbrk)
1153 #endif
1154
1155
1156 #ifdef __USE_MISC
1157 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
1158    This is completely system-dependent, and not often useful.
1159
1160    In Unix, `syscall' sets `errno' for all errors and most calls return -1
1161    for errors; in many systems you cannot pass arguments or get return
1162    values for all system calls (`pipe', `fork', and `getppid' typically
1163    among them).
1164
1165    In Mach, all system calls take normal arguments and always return an
1166    error code (zero for success).  */
1167 extern long int syscall (long int __sysno, ...) __THROW;
1168
1169 #endif  /* Use misc.  */
1170
1171 /* Are we in a secure process environment or are we dealing with setuid
1172  * stuff?  This value is returned by issetugid().
1173  */
1174 extern int _pe_secure;
1175 libc_hidden_proto(_pe_secure)
1176
1177 #ifdef __USE_BSD
1178 /* issetugid() returns 1 if the process environment or memory address space
1179    is considered tainted, and returns 0 otherwise.  This happens, for example,
1180    when a process's privileges are elevated by the setuid or setgid flags on
1181    an executable belonging to root.
1182 */
1183 extern int issetugid(void);
1184 #endif
1185
1186 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
1187 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
1188    files consistent.  Some systems have them there and some here, and some
1189    software depends on the macros being defined without including both.  */
1190
1191 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
1192    LEN is always relative to the current file position.
1193    The CMD argument is one of the following.
1194
1195    This function is a cancellation point and therefore not marked with
1196    __THROW.  */
1197
1198 # define F_ULOCK 0      /* Unlock a previously locked region.  */
1199 # define F_LOCK  1      /* Lock a region for exclusive use.  */
1200 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
1201 # define F_TEST  3      /* Test a region for other processes locks.  */
1202
1203 # ifndef __USE_FILE_OFFSET64
1204 extern int lockf (int __fd, int __cmd, __off_t __len) __wur;
1205 libc_hidden_proto(lockf)
1206 # else
1207 #  ifdef __REDIRECT
1208 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len),
1209                        lockf64) __wur;
1210 #  else
1211 #   define lockf lockf64
1212 #  endif
1213 # endif
1214 # ifdef __USE_LARGEFILE64
1215 extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur;
1216 # endif
1217 #endif /* Use misc and F_LOCK not already defined.  */
1218
1219
1220 #ifdef __USE_GNU
1221
1222 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
1223    set to EINTR.  */
1224
1225 # define TEMP_FAILURE_RETRY(expression) \
1226   (__extension__                                                              \
1227     ({ long int __result;                                                     \
1228        do __result = (long int) (expression);                                 \
1229        while (__result == -1L && errno == EINTR);                             \
1230        __result; }))
1231 #endif
1232
1233 #if (defined __USE_POSIX199309 || defined __USE_UNIX98) \
1234         && defined __UCLIBC_HAS_REALTIME__
1235 /* Synchronize at least the data part of a file with the underlying
1236    media.  */
1237 extern int fdatasync (int __fildes);
1238 #endif /* Use POSIX199309 */
1239
1240
1241 /* XPG4.2 specifies that prototypes for the encryption functions must
1242    be defined here.  */
1243 #ifdef  __USE_XOPEN
1244 # if defined __UCLIBC_HAS_CRYPT__
1245 /* Encrypt at most 8 characters from KEY using salt to perturb DES.  */
1246 extern char *crypt (const char *__key, const char *__salt)
1247      __THROW __nonnull ((1, 2));
1248
1249 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
1250    block in place.  */
1251 extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
1252 # endif /* __UCLIBC_HAS_CRYPT__ */
1253
1254
1255 /* Swab pairs bytes in the first N bytes of the area pointed to by
1256    FROM and copy the result to TO.  The value of TO must not be in the
1257    range [FROM - N + 1, FROM - 1].  If N is odd the first byte in FROM
1258    is without partner.  */
1259 extern void swab (const void *__restrict __from, void *__restrict __to,
1260                   ssize_t __n) __THROW __nonnull ((1, 2));
1261 #endif
1262
1263
1264 /* The Single Unix specification demands this prototype to be here.
1265    It is also found in <stdio.h>.  */
1266 #ifdef __USE_XOPEN
1267 /* Return the name of the controlling terminal.  */
1268 extern char *ctermid (char *__s) __THROW;
1269 #endif
1270
1271
1272 /* Define some macros helping to catch buffer overflows.  */
1273 #if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline
1274 # include <bits/unistd.h>
1275 #endif
1276
1277 __END_DECLS
1278
1279
1280 #ifdef _LIBC
1281 #ifndef smallint_type /* if arch didn't override it in bits/wordsize.h */
1282 #define smallint_type int
1283 #endif
1284 typedef signed smallint_type smallint;
1285 typedef unsigned smallint_type smalluint;
1286 extern size_t __pagesize attribute_hidden;
1287 #endif
1288
1289
1290 #endif /* unistd.h  */