1 /* Copyright (C) 1991-2006, 2007, 2008, 2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 * POSIX Standard: 2.10 Symbolic Constants <unistd.h>
30 /* These may be used to determine what facilities are present at compile time.
31 Their values can be obtained at run time from `sysconf'. */
34 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */
35 # define _POSIX_VERSION 200809L
36 #elif defined __USE_XOPEN2K
37 /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */
38 # define _POSIX_VERSION 200112L
39 #elif defined __USE_POSIX199506
40 /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */
41 # define _POSIX_VERSION 199506L
42 #elif defined __USE_POSIX199309
43 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */
44 # define _POSIX_VERSION 199309L
46 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */
47 # define _POSIX_VERSION 199009L
50 /* These are not #ifdef __USE_POSIX2 because they are
51 in the theoretically application-owned namespace. */
54 # define __POSIX2_THIS_VERSION 200809L
55 /* The utilities on GNU systems also correspond to this version. */
56 #elif defined __USE_XOPEN2K
57 /* The utilities on GNU systems also correspond to this version. */
58 # define __POSIX2_THIS_VERSION 200112L
59 #elif defined __USE_POSIX199506
60 /* The utilities on GNU systems also correspond to this version. */
61 # define __POSIX2_THIS_VERSION 199506L
63 /* The utilities on GNU systems also correspond to this version. */
64 # define __POSIX2_THIS_VERSION 199209L
67 /* The utilities on GNU systems also correspond to this version. */
68 #define _POSIX2_VERSION __POSIX2_THIS_VERSION
70 /* If defined, the implementation supports the
71 C Language Bindings Option. */
72 #define _POSIX2_C_BIND __POSIX2_THIS_VERSION
74 /* If defined, the implementation supports the
75 C Language Development Utilities Option. */
76 #define _POSIX2_C_DEV __POSIX2_THIS_VERSION
78 /* If defined, the implementation supports the
79 Software Development Utilities Option. */
80 #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION
82 #if 0 /* uClibc does not provide the utility */
83 /* If defined, the implementation supports the
84 creation of locales with the localedef utility. */
85 #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION
88 /* X/Open version number to which the library conforms. It is selectable. */
90 # define _XOPEN_VERSION 700
91 #elif defined __USE_XOPEN2K
92 # define _XOPEN_VERSION 600
93 #elif defined __USE_UNIX98
94 # define _XOPEN_VERSION 500
96 # define _XOPEN_VERSION 4
99 /* Commands and utilities from XPG4 are available. */
100 #define _XOPEN_XCU_VERSION 4
102 /* We are compatible with the old published standards as well. */
103 #define _XOPEN_XPG2 1
104 #define _XOPEN_XPG3 1
105 #define _XOPEN_XPG4 1
107 /* The X/Open Unix extensions are available. */
108 #define _XOPEN_UNIX 1
110 /* Encryption is present. */
111 #define _XOPEN_CRYPT 1
113 /* The enhanced internationalization capabilities according to XPG4.2
115 #define _XOPEN_ENH_I18N 1
117 /* The legacy interfaces are also available. */
118 #define _XOPEN_LEGACY 1
121 /* Get values of POSIX options:
123 If these symbols are defined, the corresponding features are
124 always available. If not, they may be available sometimes.
125 The current values can be obtained with `sysconf'.
127 _POSIX_JOB_CONTROL Job control is supported.
128 _POSIX_SAVED_IDS Processes have a saved set-user-ID
129 and a saved set-group-ID.
130 _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.
131 _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.
132 _POSIX_TIMERS POSIX.4 clocks and timers are supported.
133 _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.
134 _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.
135 _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.
136 _POSIX_FSYNC The fsync function is present.
137 _POSIX_MAPPED_FILES Mapping of files to memory is supported.
138 _POSIX_MEMLOCK Locking of all memory is supported.
139 _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.
140 _POSIX_MEMORY_PROTECTION Setting of memory protections is supported.
141 _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.
142 _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.
143 _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
144 _POSIX_THREADS POSIX.1c pthreads are supported.
145 _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
146 _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
147 _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
148 _POSIX_THREAD_PRIORITY_SCHEDULING
149 POSIX.1c thread execution scheduling supported.
150 _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.
151 _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.
152 _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
153 _POSIX_PII Protocol-independent interfaces are supported.
154 _POSIX_PII_XTI XTI protocol-indep. interfaces are supported.
155 _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.
156 _POSIX_PII_INTERNET Internet family of protocols supported.
157 _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.
158 _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.
159 _POSIX_PII_OSI ISO/OSI family of protocols supported.
160 _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.
161 _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.
162 _POSIX_POLL Implementation supports `poll' function.
163 _POSIX_SELECT Implementation supports `select' and `pselect'.
165 _XOPEN_REALTIME X/Open realtime support is available.
166 _XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
167 _XOPEN_SHM Shared memory interface according to XPG4.2.
169 _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
170 int, long, pointer, and off_t types.
171 _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit
172 int, long, and pointer and off_t with at least
174 _XBS5_LP64_OFF64 Implementation provides environment with 32-bit
175 int, and 64-bit long, pointer, and off_t types.
176 _XBS5_LPBIG_OFFBIG Implementation provides environment with at
177 least 32 bits int and long, pointer, and off_t
178 with at least 64 bits.
180 If any of these symbols is defined as -1, the corresponding option is not
181 true for any file. If any is defined as other than -1, the corresponding
182 option is true for all files. If a symbol is not defined at all, the value
183 for a specific file can be obtained from `pathconf' and `fpathconf'.
185 _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
186 the owner of a file. `chown' can only be used
187 to change the group ID of a file to a group of
188 which the calling process is a member.
189 _POSIX_NO_TRUNC Pathname components longer than
190 NAME_MAX generate an error.
191 _POSIX_VDISABLE If defined, if the value of an element of the
192 `c_cc' member of `struct termios' is
193 _POSIX_VDISABLE, no character will have the
194 effect associated with that element.
195 _POSIX_SYNC_IO Synchronous I/O may be performed.
196 _POSIX_ASYNC_IO Asynchronous I/O may be performed.
197 _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.
199 Support for the Large File Support interface is not generally available.
200 If it is available the following constants are defined to one.
201 _LFS64_LARGEFILE Low-level I/O supports large files.
202 _LFS64_STDIO Standard I/O supports large files.
205 #include <bits/posix_opt.h>
206 /* keep it after posix_opt.h, it overwrites based on uClibc's config options */
207 #include <bits/uClibc_posix_opt.h>
209 /* Get the environment definitions from Unix98. */
211 # include <bits/environments.h>
214 /* Standard file descriptors. */
215 #define STDIN_FILENO 0 /* Standard input. */
216 #define STDOUT_FILENO 1 /* Standard output. */
217 #define STDERR_FILENO 2 /* Standard error output. */
220 /* All functions that are not declared anywhere else. */
222 #include <bits/types.h>
224 #ifndef __ssize_t_defined
225 typedef __ssize_t ssize_t;
226 # define __ssize_t_defined
229 #define __need_size_t
233 #if defined __USE_XOPEN || defined __USE_XOPEN2K
234 /* The Single Unix specification says that some more types are
236 # ifndef __gid_t_defined
237 typedef __gid_t gid_t;
238 # define __gid_t_defined
241 # ifndef __uid_t_defined
242 typedef __uid_t uid_t;
243 # define __uid_t_defined
246 # ifndef __off_t_defined
247 # ifndef __USE_FILE_OFFSET64
248 typedef __off_t off_t;
250 typedef __off64_t off_t;
252 # define __off_t_defined
254 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
255 typedef __off64_t off64_t;
256 # define __off64_t_defined
259 # ifndef __useconds_t_defined
260 typedef __useconds_t useconds_t;
261 # define __useconds_t_defined
264 # ifndef __pid_t_defined
265 typedef __pid_t pid_t;
266 # define __pid_t_defined
270 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
271 # ifndef __intptr_t_defined
272 typedef __intptr_t intptr_t;
273 # define __intptr_t_defined
277 #if defined __USE_BSD || defined __USE_XOPEN
278 # ifndef __socklen_t_defined
279 typedef __socklen_t socklen_t;
280 # define __socklen_t_defined
284 /* Values for the second argument to access.
285 These may be OR'd together. */
286 #define R_OK 4 /* Test for read permission. */
287 #define W_OK 2 /* Test for write permission. */
288 #define X_OK 1 /* Test for execute permission. */
289 #define F_OK 0 /* Test for existence. */
291 /* Test for access to NAME using the real UID and real GID. */
292 extern int access (__const char *__name, int __type) __THROW __nonnull ((1));
294 #if 0 /*def __USE_GNU*/
295 /* Test for access to NAME using the effective UID and GID
296 (as normal file operations use). */
297 extern int euidaccess (__const char *__name, int __type)
298 __THROW __nonnull ((1));
300 /* An alias for `euidaccess', used by some other systems. */
301 extern int eaccess (__const char *__name, int __type)
302 __THROW __nonnull ((1));
306 /* Test for access to FILE relative to the directory FD is open on.
307 If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess',
308 otherwise use real IDs like `access'. */
309 extern int faccessat (int __fd, __const char *__file, int __type, int __flag)
310 __THROW __nonnull ((2)) __wur;
311 #endif /* Use GNU. */
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. */
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
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 libc_hidden_proto(lseek)
338 # ifdef __REDIRECT_NTH
339 extern __off64_t __REDIRECT_NTH (lseek,
340 (int __fd, __off64_t __offset, int __whence),
343 # define lseek lseek64
346 #ifdef __USE_LARGEFILE64
347 extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
349 libc_hidden_proto(lseek64)
352 /* Close the file descriptor FD.
354 This function is a cancellation point and therefore not marked with
356 extern int close (int __fd);
357 libc_hidden_proto(close)
359 /* Read NBYTES into BUF from FD. Return the
360 number read, -1 for errors or 0 for EOF.
362 This function is a cancellation point and therefore not marked with
364 extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;
365 libc_hidden_proto(read)
367 /* Write N bytes of BUF to FD. Return the number written, or -1.
369 This function is a cancellation point and therefore not marked with
371 extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur;
372 libc_hidden_proto(write)
375 # ifndef __USE_FILE_OFFSET64
376 /* Read NBYTES into BUF from FD at the given position OFFSET without
377 changing the file pointer. Return the number read, -1 for errors
380 This function is a cancellation point and therefore not marked with
382 extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
383 __off_t __offset) __wur;
385 /* Write N bytes of BUF to FD at the given position OFFSET without
386 changing the file pointer. Return the number written, or -1.
388 This function is a cancellation point and therefore not marked with
390 extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n,
391 __off_t __offset) __wur;
394 extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
397 extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf,
398 size_t __nbytes, __off64_t __offset),
401 # define pread pread64
402 # define pwrite pwrite64
406 # ifdef __USE_LARGEFILE64
407 /* Read NBYTES into BUF from FD at the given position OFFSET without
408 changing the file pointer. Return the number read, -1 for errors
410 extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
411 __off64_t __offset) __wur;
412 /* Write N bytes of BUF to FD at the given position OFFSET without
413 changing the file pointer. Return the number written, or -1. */
414 extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n,
415 __off64_t __offset) __wur;
419 /* Create a one-way communication channel (pipe).
420 If successful, two file descriptors are stored in PIPEDES;
421 bytes written on PIPEDES[1] can be read from PIPEDES[0].
422 Returns 0 if successful, -1 if not. */
423 extern int pipe (int __pipedes[2]) __THROW __wur;
424 libc_hidden_proto(pipe)
426 #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
427 /* Same as pipe but apply flags passed in FLAGS to the new file
429 extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;
430 libc_hidden_proto(pipe2)
433 /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
434 If SECONDS is zero, any currently scheduled alarm will be cancelled.
435 The function returns the number of seconds remaining until the last
436 alarm scheduled would have signaled, or zero if there wasn't one.
437 There is no return value to indicate an error, but you can set `errno'
438 to 0 and check its value after calling `alarm', and this might tell you.
439 The signal may come late due to processor scheduling. */
440 extern unsigned int alarm (unsigned int __seconds) __THROW;
441 libc_hidden_proto(alarm)
443 /* Make the process sleep for SECONDS seconds, or until a signal arrives
444 and is not ignored. The function returns the number of seconds less
445 than SECONDS which it actually slept (thus zero if it slept the full time).
446 If a signal handler does a `longjmp' or modifies the handling of the
447 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
448 signal afterwards is undefined. There is no return value to indicate
449 error, but if `sleep' returns SECONDS, it probably didn't work.
451 This function is a cancellation point and therefore not marked with
453 extern unsigned int sleep (unsigned int __seconds);
454 libc_hidden_proto(sleep)
456 #if (defined __USE_BSD || defined __USE_XOPEN_EXTENDED) \
457 && defined __UCLIBC_SUSV3_LEGACY__
458 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
459 microseconds. If INTERVAL is nonzero, when the alarm goes off, the
460 timer is reset to go off every INTERVAL microseconds thereafter.
461 Returns the number of microseconds remaining before the alarm. */
462 extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)
465 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
468 This function is a cancellation point and therefore not marked with
470 extern int usleep (__useconds_t __useconds);
474 /* Suspend the process until a signal arrives.
475 This always returns -1 and sets `errno' to EINTR.
477 This function is a cancellation point and therefore not marked with
479 extern int pause (void);
482 /* Change the owner and group of FILE. */
483 extern int chown (__const char *__file, __uid_t __owner, __gid_t __group)
484 __THROW __nonnull ((1)) __wur;
485 libc_hidden_proto(chown)
487 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
488 /* Change the owner and group of the file that FD is open on. */
489 extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;
492 /* Change owner and group of FILE, if it is a symbolic
493 link the ownership of the symbolic link is changed. */
494 extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group)
495 __THROW __nonnull ((1)) __wur;
497 #endif /* Use BSD || X/Open Unix. */
500 /* Change the owner and group of FILE relative to the directory FD is open
502 extern int fchownat (int __fd, __const char *__file, __uid_t __owner,
503 __gid_t __group, int __flag)
504 __THROW __nonnull ((2)) __wur;
505 #endif /* Use GNU. */
507 /* Change the process's working directory to PATH. */
508 extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur;
509 libc_hidden_proto(chdir)
511 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
512 /* Change the process's working directory to the one FD is open on. */
513 extern int fchdir (int __fd) __THROW __wur;
514 libc_hidden_proto(fchdir)
517 /* Get the pathname of the current working directory,
518 and put it in SIZE bytes of BUF. Returns NULL if the
519 directory couldn't be determined or SIZE was too small.
520 If successful, returns BUF. In GNU, if BUF is NULL,
521 an array is allocated with `malloc'; the array is SIZE
522 bytes long, unless SIZE == 0, in which case it is as
524 extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
525 libc_hidden_proto(getcwd)
528 /* Return a malloc'd string containing the current directory name.
529 If the environment variable `PWD' is set, and its value is correct,
530 that value is used. */
531 extern char *get_current_dir_name (void) __THROW;
534 #if 0 /*defined __USE_BSD || defined __USE_XOPEN_EXTENDED*/
535 /* Put the absolute pathname of the current working directory in BUF.
536 If successful, return BUF. If not, put an error message in
537 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
538 extern char *getwd (char *__buf)
539 __THROW __nonnull ((1)) __attribute_deprecated__ __wur;
543 /* Duplicate FD, returning a new file descriptor on the same file. */
544 extern int dup (int __fd) __THROW __wur;
546 /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
547 extern int dup2 (int __fd, int __fd2) __THROW;
548 libc_hidden_proto(dup2)
550 /* NULL-terminated array of "NAME=VALUE" environment variables. */
551 extern char **__environ;
553 extern char **environ;
557 /* Replace the current process, executing PATH with arguments ARGV and
558 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
559 extern int execve (__const char *__path, char *__const __argv[],
560 char *__const __envp[]) __THROW __nonnull ((1));
561 libc_hidden_proto(execve)
563 #if 0 /*def __USE_XOPEN2K8*/
564 /* Execute the file FD refers to, overlaying the running program image.
565 ARGV and ENVP are passed to the new program, as for `execve'. */
566 extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[])
571 /* Execute PATH with arguments ARGV and environment from `environ'. */
572 extern int execv (__const char *__path, char *__const __argv[])
573 __THROW __nonnull ((1));
574 libc_hidden_proto(execv)
576 /* Execute PATH with all arguments after PATH until a NULL pointer,
577 and the argument after that for environment. */
578 extern int execle (__const char *__path, __const char *__arg, ...)
579 __THROW __nonnull ((1));
580 libc_hidden_proto(execle)
582 /* Execute PATH with all arguments after PATH until
583 a NULL pointer and environment from `environ'. */
584 extern int execl (__const char *__path, __const char *__arg, ...)
585 __THROW __nonnull ((1));
586 libc_hidden_proto(execl)
588 /* Execute FILE, searching in the `PATH' environment variable if it contains
589 no slashes, with arguments ARGV and environment from `environ'. */
590 extern int execvp (__const char *__file, char *__const __argv[])
591 __THROW __nonnull ((1));
592 libc_hidden_proto(execvp)
594 /* Execute FILE, searching in the `PATH' environment variable if
595 it contains no slashes, with all arguments after FILE until a
596 NULL pointer and environment from `environ'. */
597 extern int execlp (__const char *__file, __const char *__arg, ...)
598 __THROW __nonnull ((1));
599 libc_hidden_proto(execlp)
602 #if defined __USE_MISC || defined __USE_XOPEN
603 /* Add INC to priority of the current process. */
604 extern int nice (int __inc) __THROW __wur;
608 /* Terminate program execution with the low-order 8 bits of STATUS. */
609 extern void _exit (int __status) __attribute__ ((__noreturn__));
610 libc_hidden_proto(_exit)
613 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
614 the `_SC_*' symbols for the NAME argument to `sysconf';
615 and the `_CS_*' symbols for the NAME argument to `confstr'. */
616 #include <bits/confname.h>
618 /* Get file-specific configuration information about PATH. */
619 extern long int pathconf (__const char *__path, int __name)
620 __THROW __nonnull ((1));
622 /* Get file-specific configuration about descriptor FD. */
623 extern long int fpathconf (int __fd, int __name) __THROW;
625 /* Get the value of the system variable NAME. */
626 extern long int sysconf (int __name) __THROW;
627 libc_hidden_proto(sysconf)
630 /* Get the value of the string-valued system variable NAME. */
631 extern size_t confstr (int __name, char *__buf, size_t __len) __THROW;
635 /* Get the process ID of the calling process. */
636 extern __pid_t getpid (void) __THROW;
637 libc_hidden_proto(getpid)
639 /* Get the process ID of the calling process's parent. */
640 extern __pid_t getppid (void) __THROW;
642 /* Get the process group ID of the calling process.
643 This function is different on old BSD. */
645 extern __pid_t getpgrp (void) __THROW;
647 # ifdef __REDIRECT_NTH
648 extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid);
650 # define getpgrp __getpgid
654 /* Get the process group ID of process PID. */
655 extern __pid_t __getpgid (__pid_t __pid) __THROW;
656 #ifdef __USE_XOPEN_EXTENDED
657 extern __pid_t getpgid (__pid_t __pid) __THROW;
661 /* Set the process group ID of the process matching PID to PGID.
662 If PID is zero, the current process's process group ID is set.
663 If PGID is zero, the process ID of the process is used. */
664 extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
665 libc_hidden_proto(setpgid)
667 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
668 /* Both System V and BSD have `setpgrp' functions, but with different
669 calling conventions. The BSD function is the same as POSIX.1 `setpgid'
670 (above). The System V function takes no arguments and puts the calling
671 process in its on group like `setpgid (0, 0)'.
673 New programs should always use `setpgid' instead.
675 The default in GNU is to provide the System V function. The BSD
676 function is available under -D_BSD_SOURCE. */
680 /* Set the process group ID of the calling process to its own PID.
681 This is exactly the same as `setpgid (0, 0)'. */
682 extern int setpgrp (void) __THROW;
686 /* Another name for `setpgid' (above). */
687 # ifdef __REDIRECT_NTH
688 extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid);
690 # define setpgrp setpgid
693 # endif /* Favor BSD. */
694 #endif /* Use SVID or BSD. */
696 /* Create a new session with the calling process as its leader.
697 The process group IDs of the session and the calling process
698 are set to the process ID of the calling process, which is returned. */
699 extern __pid_t setsid (void) __THROW;
700 libc_hidden_proto(setsid)
702 #ifdef __USE_XOPEN_EXTENDED
703 /* Return the session ID of the given process. */
704 extern __pid_t getsid (__pid_t __pid) __THROW;
705 libc_hidden_proto(getsid)
708 /* Get the real user ID of the calling process. */
709 extern __uid_t getuid (void) __THROW;
710 libc_hidden_proto(getuid)
712 /* Get the effective user ID of the calling process. */
713 extern __uid_t geteuid (void) __THROW;
714 libc_hidden_proto(geteuid)
716 /* Get the real group ID of the calling process. */
717 extern __gid_t getgid (void) __THROW;
718 libc_hidden_proto(getgid)
720 /* Get the effective group ID of the calling process. */
721 extern __gid_t getegid (void) __THROW;
722 libc_hidden_proto(getegid)
724 /* If SIZE is zero, return the number of supplementary groups
725 the calling process is in. Otherwise, fill in the group IDs
726 of its supplementary groups in LIST and return the number written. */
727 extern int getgroups (int __size, __gid_t __list[]) __THROW __wur;
728 libc_hidden_proto(getgroups)
730 #if 0 /*def __USE_GNU*/
731 /* Return nonzero iff the calling process is in group GID. */
732 extern int group_member (__gid_t __gid) __THROW;
735 /* Set the user ID of the calling process to UID.
736 If the calling process is the super-user, set the real
737 and effective user IDs, and the saved set-user-ID to UID;
738 if not, the effective user ID is set to UID. */
739 extern int setuid (__uid_t __uid) __THROW;
741 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
742 /* Set the real user ID of the calling process to RUID,
743 and the effective user ID of the calling process to EUID. */
744 extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW;
745 libc_hidden_proto(setreuid)
748 #if defined __USE_BSD || defined __USE_XOPEN2K
749 /* Set the effective user ID of the calling process to UID. */
750 extern int seteuid (__uid_t __uid) __THROW;
751 libc_hidden_proto(seteuid)
752 #endif /* Use BSD. */
754 /* Set the group ID of the calling process to GID.
755 If the calling process is the super-user, set the real
756 and effective group IDs, and the saved set-group-ID to GID;
757 if not, the effective group ID is set to GID. */
758 extern int setgid (__gid_t __gid) __THROW;
760 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
761 /* Set the real group ID of the calling process to RGID,
762 and the effective group ID of the calling process to EGID. */
763 extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW;
764 libc_hidden_proto(setregid)
767 #if defined __USE_BSD || defined __USE_XOPEN2K
768 /* Set the effective group ID of the calling process to GID. */
769 extern int setegid (__gid_t __gid) __THROW;
770 #endif /* Use BSD. */
773 /* Fetch the real user ID, effective user ID, and saved-set user ID,
774 of the calling process. */
775 extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid)
778 /* Fetch the real group ID, effective group ID, and saved-set group ID,
779 of the calling process. */
780 extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid)
783 #if defined __UCLIBC_LINUX_SPECIFIC__
784 /* Set the real user ID, effective user ID, and saved-set user ID,
785 of the calling process to RUID, EUID, and SUID, respectively. */
786 extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid)
788 libc_hidden_proto(setresuid)
791 /* Set the real group ID, effective group ID, and saved-set group ID,
792 of the calling process to RGID, EGID, and SGID, respectively. */
793 extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid)
795 libc_hidden_proto(setresgid)
799 #if defined __UCLIBC_HAS_STUBS__ || defined __ARCH_USE_MMU__
800 /* Clone the calling process, creating an exact copy.
801 Return -1 for errors, 0 to the new process,
802 and the process ID of the new process to the old process. */
803 extern __pid_t fork (void) __THROW;
805 extern __typeof(fork) __libc_fork;
806 libc_hidden_proto(fork)
810 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
811 /* Clone the calling process, but without copying the whole address space.
812 The calling process is suspended until the new process exits or is
813 replaced by a call to `execve'. 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 vfork (void) __THROW;
816 libc_hidden_proto(vfork)
817 #endif /* Use BSD. */
819 #if 0 /* psm: seems unused , exit-thread.S is not compiled */
820 /* Special exit function which only terminates the current thread. */
821 extern void __exit_thread (int val) __attribute__ ((__noreturn__));
824 /* Return the pathname of the terminal FD is open on, or NULL on errors.
825 The returned storage is good only until the next call to this function. */
826 extern char *ttyname (int __fd) __THROW;
828 /* Store at most BUFLEN characters of the pathname of the terminal FD is
829 open on in BUF. Return 0 on success, otherwise an error number. */
830 extern int ttyname_r (int __fd, char *__buf, size_t __buflen)
831 __THROW __nonnull ((2)) __wur;
832 libc_hidden_proto(ttyname_r)
834 /* Return 1 if FD is a valid descriptor associated
835 with a terminal, zero if not. */
836 extern int isatty (int __fd) __THROW;
837 libc_hidden_proto(isatty)
839 #if 0 /*defined __USE_BSD \
840 || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)*/
841 /* Return the index into the active-logins file (utmp) for
842 the controlling terminal. */
843 extern int ttyslot (void) __THROW;
847 /* Make a link to FROM named TO. */
848 extern int link (__const char *__from, __const char *__to)
849 __THROW __nonnull ((1, 2)) __wur;
852 /* Like link but relative paths in TO and FROM are interpreted relative
853 to FROMFD and TOFD respectively. */
854 extern int linkat (int __fromfd, __const char *__from, int __tofd,
855 __const char *__to, int __flags)
856 __THROW __nonnull ((2, 4)) __wur;
859 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
860 /* Make a symbolic link to FROM named TO. */
861 extern int symlink (__const char *__from, __const char *__to)
862 __THROW __nonnull ((1, 2)) __wur;
864 /* Read the contents of the symbolic link PATH into no more than
865 LEN bytes of BUF. The contents are not null-terminated.
866 Returns the number of characters read, or -1 for errors. */
867 extern ssize_t readlink (__const char *__restrict __path,
868 char *__restrict __buf, size_t __len)
869 __THROW __nonnull ((1, 2)) __wur;
870 libc_hidden_proto(readlink)
871 #endif /* Use BSD. */
874 /* Like symlink but a relative path in TO is interpreted relative to TOFD. */
875 extern int symlinkat (__const char *__from, int __tofd,
876 __const char *__to) __THROW __nonnull ((1, 3)) __wur;
878 /* Like readlink but a relative PATH is interpreted relative to FD. */
879 extern ssize_t readlinkat (int __fd, __const char *__restrict __path,
880 char *__restrict __buf, size_t __len)
881 __THROW __nonnull ((2, 3)) __wur;
884 /* Remove the link NAME. */
885 extern int unlink (__const char *__name) __THROW __nonnull ((1));
886 libc_hidden_proto(unlink)
889 /* Remove the link NAME relative to FD. */
890 extern int unlinkat (int __fd, __const char *__name, int __flag)
891 __THROW __nonnull ((2));
894 /* Remove the directory PATH. */
895 extern int rmdir (__const char *__path) __THROW __nonnull ((1));
896 libc_hidden_proto(rmdir)
899 /* Return the foreground process group ID of FD. */
900 extern __pid_t tcgetpgrp (int __fd) __THROW;
901 libc_hidden_proto(tcgetpgrp)
903 /* Set the foreground process group ID of FD set PGRP_ID. */
904 extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
907 /* Return the login name of the user.
909 This function is a possible cancellation points and therefore not
910 marked with __THROW. */
911 extern char *getlogin (void);
912 libc_hidden_proto(getlogin)
913 #if defined __USE_REENTRANT || defined __USE_POSIX199506
914 /* Return at most NAME_LEN characters of the login name of the user in NAME.
915 If it cannot be determined or some other error occurred, return the error
916 code. Otherwise return 0.
918 This function is a possible cancellation points and therefore not
919 marked with __THROW. */
920 extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1));
923 #if 0 /*def __USE_BSD*/
924 /* Set the login name returned by `getlogin'. */
925 extern int setlogin (__const char *__name) __THROW __nonnull ((1));
930 /* Get definitions and prototypes for functions to process the
931 arguments in ARGV (ARGC of them, minus the program name) for
932 options given in OPTS. */
933 # define __need_getopt
934 /* keep this for uClibc in bits/, we need it when GNU_GETOPT is disabled */
935 # include <bits/getopt.h>
939 #if defined __USE_BSD || defined __USE_UNIX98
940 /* Put the name of the current host in no more than LEN bytes of NAME.
941 The result is null-terminated if LEN is large enough for the full
942 name and the terminator. */
943 extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1));
944 libc_hidden_proto(gethostname)
948 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
949 /* Set the name of the current host to NAME, which is LEN bytes long.
950 This call is restricted to the super-user. */
951 extern int sethostname (__const char *__name, size_t __len)
952 __THROW __nonnull ((1)) __wur;
954 /* Set the current machine's Internet number to ID.
955 This call is restricted to the super-user. */
956 extern int sethostid (long int __id) __THROW __wur;
959 #if defined __UCLIBC_BSD_SPECIFIC__ || defined _LIBC
960 /* Get and set the NIS (aka YP) domain name, if any.
961 Called just like `gethostname' and `sethostname'.
962 The NIS domain name is usually the empty string when not using NIS. */
963 extern int getdomainname (char *__name, size_t __len)
964 __THROW __nonnull ((1)) __wur;
965 libc_hidden_proto(getdomainname)
967 #if defined __UCLIBC_BSD_SPECIFIC__
968 extern int setdomainname (__const char *__name, size_t __len)
969 __THROW __nonnull ((1)) __wur;
973 #if defined __UCLIBC_LINUX_SPECIFIC__
974 /* Revoke access permissions to all processes currently communicating
975 with the control terminal, and then send a SIGHUP signal to the process
976 group of the control terminal. */
977 extern int vhangup (void) __THROW;
981 /* Revoke the access of all descriptors currently open on FILE. */
982 extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur;
985 /* Enable statistical profiling, writing samples of the PC into at most
986 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
987 is enabled, the system examines the user PC and increments
988 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
989 disable profiling. Returns zero on success, -1 on error. */
990 extern int profil (unsigned short int *__sample_buffer, size_t __size,
991 size_t __offset, unsigned int __scale)
992 __THROW __nonnull ((1));
996 /* Turn accounting on if NAME is an existing file. The system will then write
997 a record for each process as it terminates, to this file. If NAME is NULL,
998 turn accounting off. This call is restricted to the super-user. */
999 extern int acct (__const char *__name) __THROW;
1002 /* Successive calls return the shells listed in `/etc/shells'. */
1003 extern char *getusershell (void) __THROW;
1004 extern void endusershell (void) __THROW; /* Discard cached info. */
1005 libc_hidden_proto(endusershell)
1006 extern void setusershell (void) __THROW; /* Rewind and re-read the file. */
1007 libc_hidden_proto(setusershell)
1010 /* Put the program in the background, and dissociate from the controlling
1011 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
1012 redirects stdin, stdout, and stderr to /dev/null. */
1013 extern int daemon (int __nochdir, int __noclose) __THROW __wur;
1014 #endif /* Use BSD || X/Open. */
1017 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
1018 /* Make PATH be the root directory (the starting point for absolute paths).
1019 This call is restricted to the super-user. */
1020 extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur;
1022 /* Prompt with PROMPT and read a string from the terminal without echoing.
1023 Uses /dev/tty if possible; otherwise stderr and stdin. */
1024 extern char *getpass (__const char *__prompt) __nonnull ((1));
1025 #endif /* Use BSD || X/Open. */
1028 #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K
1029 /* Make all changes done to FD actually appear on disk.
1031 This function is a cancellation point and therefore not marked with
1033 extern int fsync (int __fd);
1034 #endif /* Use BSD || X/Open || Unix98. */
1037 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
1039 /* Return identifier for the current host. */
1040 extern long int gethostid (void);
1042 /* Make all changes done to all files actually appear on disk. */
1043 extern void sync (void) __THROW;
1046 /* Return the number of bytes in a page. This is the system's page size,
1047 which is not necessarily the same as the hardware page size. */
1048 extern int getpagesize (void) __THROW __attribute__ ((__const__));
1049 libc_hidden_proto(getpagesize)
1052 /* Return the maximum number of file descriptors
1053 the current process could possibly have. */
1054 extern int getdtablesize (void) __THROW;
1055 libc_hidden_proto(getdtablesize)
1058 /* Truncate FILE to LENGTH bytes. */
1059 # ifndef __USE_FILE_OFFSET64
1060 extern int truncate (__const char *__file, __off_t __length)
1061 __THROW __nonnull ((1)) __wur;
1062 libc_hidden_proto(truncate)
1064 # ifdef __REDIRECT_NTH
1065 extern int __REDIRECT_NTH (truncate,
1066 (__const char *__file, __off64_t __length),
1067 truncate64) __nonnull ((1)) __wur;
1069 # define truncate truncate64
1072 # ifdef __USE_LARGEFILE64
1073 extern int truncate64 (__const char *__file, __off64_t __length)
1074 __THROW __nonnull ((1)) __wur;
1077 #endif /* Use BSD || X/Open Unix. */
1079 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
1081 /* Truncate the file FD is open on to LENGTH bytes. */
1082 # ifndef __USE_FILE_OFFSET64
1083 extern int ftruncate (int __fd, __off_t __length) __THROW __wur;
1084 libc_hidden_proto(ftruncate)
1086 # ifdef __REDIRECT_NTH
1087 extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length),
1090 # define ftruncate ftruncate64
1093 # ifdef __USE_LARGEFILE64
1094 extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur;
1095 libc_hidden_proto(ftruncate64)
1098 #endif /* Use BSD || X/Open Unix || POSIX 2003. */
1101 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
1103 /* Set the end of accessible data space (aka "the break") to ADDR.
1104 Returns zero on success and -1 for errors (with errno set). */
1105 extern int brk (void *__addr) __THROW __wur;
1106 libc_hidden_proto(brk)
1108 /* Increase or decrease the end of accessible data space by DELTA bytes.
1109 If successful, returns the address the previous end of data space
1110 (i.e. the beginning of the new space, if DELTA > 0);
1111 returns (void *) -1 for errors (with errno set). */
1112 extern void *sbrk (intptr_t __delta) __THROW;
1113 libc_hidden_proto(sbrk)
1118 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
1119 This is completely system-dependent, and not often useful.
1121 In Unix, `syscall' sets `errno' for all errors and most calls return -1
1122 for errors; in many systems you cannot pass arguments or get return
1123 values for all system calls (`pipe', `fork', and `getppid' typically
1126 In Mach, all system calls take normal arguments and always return an
1127 error code (zero for success). */
1128 extern long int syscall (long int __sysno, ...) __THROW;
1130 #endif /* Use misc. */
1133 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
1134 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
1135 files consistent. Some systems have them there and some here, and some
1136 software depends on the macros being defined without including both. */
1138 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
1139 LEN is always relative to the current file position.
1140 The CMD argument is one of the following.
1142 This function is a cancellation point and therefore not marked with
1145 # define F_ULOCK 0 /* Unlock a previously locked region. */
1146 # define F_LOCK 1 /* Lock a region for exclusive use. */
1147 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
1148 # define F_TEST 3 /* Test a region for other processes locks. */
1150 # ifndef __USE_FILE_OFFSET64
1151 extern int lockf (int __fd, int __cmd, __off_t __len) __wur;
1152 libc_hidden_proto(lockf)
1155 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len),
1158 # define lockf lockf64
1161 # ifdef __USE_LARGEFILE64
1162 extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur;
1164 #endif /* Use misc and F_LOCK not already defined. */
1169 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
1172 # define TEMP_FAILURE_RETRY(expression) \
1174 ({ long int __result; \
1175 do __result = (long int) (expression); \
1176 while (__result == -1L && errno == EINTR); \
1180 #if (defined __USE_POSIX199309 || defined __USE_UNIX98) \
1181 && defined __UCLIBC_HAS_REALTIME__
1182 /* Synchronize at least the data part of a file with the underlying
1184 extern int fdatasync (int __fildes);
1185 #endif /* Use POSIX199309 */
1188 /* XPG4.2 specifies that prototypes for the encryption functions must
1191 # if defined __UCLIBC_HAS_CRYPT__
1192 /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
1193 extern char *crypt (__const char *__key, __const char *__salt)
1194 __THROW __nonnull ((1, 2));
1196 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
1198 extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
1199 # endif /* __UCLIBC_HAS_CRYPT__ */
1202 /* Swab pairs bytes in the first N bytes of the area pointed to by
1203 FROM and copy the result to TO. The value of TO must not be in the
1204 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
1205 is without partner. */
1206 extern void swab (__const void *__restrict __from, void *__restrict __to,
1207 ssize_t __n) __THROW __nonnull ((1, 2));
1211 /* The Single Unix specification demands this prototype to be here.
1212 It is also found in <stdio.h>. */
1214 /* Return the name of the controlling terminal. */
1215 extern char *ctermid (char *__s) __THROW;
1219 /* Define some macros helping to catch buffer overflows. */
1220 #if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline
1221 # include <bits/unistd.h>
1228 #ifndef smallint_type /* if arch didn't override it in bits/wordsize.h */
1229 #define smallint_type int
1231 typedef signed smallint_type smallint;
1232 typedef unsigned smallint_type smalluint;
1233 extern size_t __pagesize attribute_hidden;
1237 #endif /* unistd.h */