include/unistd.h

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