1 /* Copyright (C) 1991-2002,2003,2004,2005,2006 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'. */
33 /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */
34 #define _POSIX_VERSION 200112L
36 /* These are not #ifdef __USE_POSIX2 because they are
37 in the theoretically application-owned namespace. */
39 /* The utilities on GNU systems also correspond to this version. */
40 #define _POSIX2_VERSION 200112L
42 /* If defined, the implementation supports the
43 C Language Bindings Option. */
44 #define _POSIX2_C_BIND 200112L
46 /* If defined, the implementation supports the
47 C Language Development Utilities Option. */
48 #define _POSIX2_C_DEV 200112L
50 /* If defined, the implementation supports the
51 Software Development Utilities Option. */
52 #define _POSIX2_SW_DEV 200112L
54 #if 0 /* uClibc does not provide the utility */
55 /* If defined, the implementation supports the
56 creation of locales with the localedef utility. */
57 #define _POSIX2_LOCALEDEF 200112L
60 /* X/Open version number to which the library conforms. It is selectable. */
62 # define _XOPEN_VERSION 500
64 # define _XOPEN_VERSION 4
67 /* Commands and utilities from XPG4 are available. */
68 #define _XOPEN_XCU_VERSION 4
70 /* We are compatible with the old published standards as well. */
75 /* The X/Open Unix extensions are available. */
78 /* Encryption is present. */
79 #define _XOPEN_CRYPT 1
81 /* The enhanced internationalization capabilities according to XPG4.2
83 #define _XOPEN_ENH_I18N 1
85 /* The legacy interfaces are also available. */
86 #define _XOPEN_LEGACY 1
89 /* Get values of POSIX options:
91 If these symbols are defined, the corresponding features are
92 always available. If not, they may be available sometimes.
93 The current values can be obtained with `sysconf'.
95 _POSIX_JOB_CONTROL Job control is supported.
96 _POSIX_SAVED_IDS Processes have a saved set-user-ID
97 and a saved set-group-ID.
98 _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.
99 _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.
100 _POSIX_TIMERS POSIX.4 clocks and timers are supported.
101 _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.
102 _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.
103 _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.
104 _POSIX_FSYNC The fsync function is present.
105 _POSIX_MAPPED_FILES Mapping of files to memory is supported.
106 _POSIX_MEMLOCK Locking of all memory is supported.
107 _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.
108 _POSIX_MEMORY_PROTECTION Setting of memory protections is supported.
109 _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.
110 _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.
111 _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
112 _POSIX_THREADS POSIX.1c pthreads are supported.
113 _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
114 _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
115 _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
116 _POSIX_THREAD_PRIORITY_SCHEDULING
117 POSIX.1c thread execution scheduling supported.
118 _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.
119 _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.
120 _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
121 _POSIX_PII Protocol-independent interfaces are supported.
122 _POSIX_PII_XTI XTI protocol-indep. interfaces are supported.
123 _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.
124 _POSIX_PII_INTERNET Internet family of protocols supported.
125 _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.
126 _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.
127 _POSIX_PII_OSI ISO/OSI family of protocols supported.
128 _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.
129 _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.
130 _POSIX_POLL Implementation supports `poll' function.
131 _POSIX_SELECT Implementation supports `select' and `pselect'.
133 _XOPEN_REALTIME X/Open realtime support is available.
134 _XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
135 _XOPEN_SHM Shared memory interface according to XPG4.2.
137 _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
138 int, long, pointer, and off_t types.
139 _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit
140 int, long, and pointer and off_t with at least
142 _XBS5_LP64_OFF64 Implementation provides environment with 32-bit
143 int, and 64-bit long, pointer, and off_t types.
144 _XBS5_LPBIG_OFFBIG Implementation provides environment with at
145 least 32 bits int and long, pointer, and off_t
146 with at least 64 bits.
148 If any of these symbols is defined as -1, the corresponding option is not
149 true for any file. If any is defined as other than -1, the corresponding
150 option is true for all files. If a symbol is not defined at all, the value
151 for a specific file can be obtained from `pathconf' and `fpathconf'.
153 _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
154 the owner of a file. `chown' can only be used
155 to change the group ID of a file to a group of
156 which the calling process is a member.
157 _POSIX_NO_TRUNC Pathname components longer than
158 NAME_MAX generate an error.
159 _POSIX_VDISABLE If defined, if the value of an element of the
160 `c_cc' member of `struct termios' is
161 _POSIX_VDISABLE, no character will have the
162 effect associated with that element.
163 _POSIX_SYNC_IO Synchronous I/O may be performed.
164 _POSIX_ASYNC_IO Asynchronous I/O may be performed.
165 _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.
167 Support for the Large File Support interface is not generally available.
168 If it is available the following constants are defined to one.
169 _LFS64_LARGEFILE Low-level I/O supports large files.
170 _LFS64_STDIO Standard I/O supports large files.
173 #include <bits/posix_opt.h>
174 #include <bits/uClibc_posix_opt.h>
176 /* Get the environment definitions from Unix98. */
178 # include <bits/environments.h>
181 /* Standard file descriptors. */
182 #define STDIN_FILENO 0 /* Standard input. */
183 #define STDOUT_FILENO 1 /* Standard output. */
184 #define STDERR_FILENO 2 /* Standard error output. */
187 /* All functions that are not declared anywhere else. */
189 #include <bits/types.h>
191 #ifndef __ssize_t_defined
192 typedef __ssize_t ssize_t;
193 # define __ssize_t_defined
196 #define __need_size_t
200 #if defined __USE_XOPEN || defined __USE_XOPEN2K
201 /* The Single Unix specification says that some more types are
203 # ifndef __gid_t_defined
204 typedef __gid_t gid_t;
205 # define __gid_t_defined
208 # ifndef __uid_t_defined
209 typedef __uid_t uid_t;
210 # define __uid_t_defined
213 # ifndef __off_t_defined
214 # ifndef __USE_FILE_OFFSET64
215 typedef __off_t off_t;
217 typedef __off64_t off_t;
219 # define __off_t_defined
221 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
222 typedef __off64_t off64_t;
223 # define __off64_t_defined
226 # ifndef __useconds_t_defined
227 typedef __useconds_t useconds_t;
228 # define __useconds_t_defined
231 # ifndef __pid_t_defined
232 typedef __pid_t pid_t;
233 # define __pid_t_defined
237 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
238 # ifndef __intptr_t_defined
239 typedef __intptr_t intptr_t;
240 # define __intptr_t_defined
244 #if defined __USE_BSD || defined __USE_XOPEN
245 # ifndef __socklen_t_defined
246 typedef __socklen_t socklen_t;
247 # define __socklen_t_defined
251 /* Values for the second argument to access.
252 These may be OR'd together. */
253 #define R_OK 4 /* Test for read permission. */
254 #define W_OK 2 /* Test for write permission. */
255 #define X_OK 1 /* Test for execute permission. */
256 #define F_OK 0 /* Test for existence. */
258 /* Test for access to NAME using the real UID and real GID. */
259 extern int access (__const char *__name, int __type) __THROW __nonnull ((1));
261 #if 0 /*def __USE_GNU*/
262 /* Test for access to NAME using the effective UID and GID
263 (as normal file operations use). */
264 extern int euidaccess (__const char *__name, int __type)
265 __THROW __nonnull ((1));
267 /* An alias for `euidaccess', used by some other systems. */
268 extern int eaccess (__const char *__name, int __type)
269 __THROW __nonnull ((1));
273 /* Test for access to FILE relative to the directory FD is open on.
274 If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess',
275 otherwise use real IDs like `access'. */
276 extern int faccessat (int __fd, __const char *__file, int __type, int __flag)
277 __THROW __nonnull ((2)) __wur;
278 #endif /* Use GNU. */
281 /* Values for the WHENCE argument to lseek. */
282 #ifndef _STDIO_H /* <stdio.h> has the same definitions. */
283 # define SEEK_SET 0 /* Seek from beginning of file. */
284 # define SEEK_CUR 1 /* Seek from current position. */
285 # define SEEK_END 2 /* Seek from end of file. */
288 #if defined __USE_BSD && !defined L_SET
289 /* Old BSD names for the same constants; just for compatibility. */
290 # define L_SET SEEK_SET
291 # define L_INCR SEEK_CUR
292 # define L_XTND SEEK_END
296 /* Move FD's file position to OFFSET bytes from the
297 beginning of the file (if WHENCE is SEEK_SET),
298 the current position (if WHENCE is SEEK_CUR),
299 or the end of the file (if WHENCE is SEEK_END).
300 Return the new file position. */
301 #ifndef __USE_FILE_OFFSET64
302 extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW;
303 libc_hidden_proto(lseek)
305 # ifdef __REDIRECT_NTH
306 extern __off64_t __REDIRECT_NTH (lseek,
307 (int __fd, __off64_t __offset, int __whence),
310 # define lseek lseek64
313 #ifdef __USE_LARGEFILE64
314 extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence)
316 libc_hidden_proto(lseek64)
319 /* Close the file descriptor FD.
321 This function is a cancellation point and therefore not marked with
323 extern int close (int __fd);
324 libc_hidden_proto(close)
326 /* Read NBYTES into BUF from FD. Return the
327 number read, -1 for errors or 0 for EOF.
329 This function is a cancellation point and therefore not marked with
331 extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur;
332 libc_hidden_proto(read)
334 /* Write N bytes of BUF to FD. Return the number written, or -1.
336 This function is a cancellation point and therefore not marked with
338 extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur;
339 libc_hidden_proto(write)
342 # ifndef __USE_FILE_OFFSET64
343 /* Read NBYTES into BUF from FD at the given position OFFSET without
344 changing the file pointer. Return the number read, -1 for errors
347 This function is a cancellation point and therefore not marked with
349 extern ssize_t pread (int __fd, void *__buf, size_t __nbytes,
350 __off_t __offset) __wur;
352 /* Write N bytes of BUF to FD at the given position OFFSET without
353 changing the file pointer. Return the number written, or -1.
355 This function is a cancellation point and therefore not marked with
357 extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n,
358 __off_t __offset) __wur;
361 extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes,
364 extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf,
365 size_t __nbytes, __off64_t __offset),
368 # define pread pread64
369 # define pwrite pwrite64
373 # ifdef __USE_LARGEFILE64
374 /* Read NBYTES into BUF from FD at the given position OFFSET without
375 changing the file pointer. Return the number read, -1 for errors
377 extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes,
378 __off64_t __offset) __wur;
379 /* Write N bytes of BUF to FD at the given position OFFSET without
380 changing the file pointer. Return the number written, or -1. */
381 extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n,
382 __off64_t __offset) __wur;
386 /* Create a one-way communication channel (pipe).
387 If successful, two file descriptors are stored in PIPEDES;
388 bytes written on PIPEDES[1] can be read from PIPEDES[0].
389 Returns 0 if successful, -1 if not. */
390 extern int pipe (int __pipedes[2]) __THROW __wur;
391 libc_hidden_proto(pipe)
393 #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
394 /* Same as pipe but apply flags passed in FLAGS to the new file
396 extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur;
397 libc_hidden_proto(pipe2)
400 /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
401 If SECONDS is zero, any currently scheduled alarm will be cancelled.
402 The function returns the number of seconds remaining until the last
403 alarm scheduled would have signaled, or zero if there wasn't one.
404 There is no return value to indicate an error, but you can set `errno'
405 to 0 and check its value after calling `alarm', and this might tell you.
406 The signal may come late due to processor scheduling. */
407 extern unsigned int alarm (unsigned int __seconds) __THROW;
408 libc_hidden_proto(alarm)
410 /* Make the process sleep for SECONDS seconds, or until a signal arrives
411 and is not ignored. The function returns the number of seconds less
412 than SECONDS which it actually slept (thus zero if it slept the full time).
413 If a signal handler does a `longjmp' or modifies the handling of the
414 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
415 signal afterwards is undefined. There is no return value to indicate
416 error, but if `sleep' returns SECONDS, it probably didn't work.
418 This function is a cancellation point and therefore not marked with
420 extern unsigned int sleep (unsigned int __seconds);
421 libc_hidden_proto(sleep)
423 #if (defined __USE_BSD || defined __USE_XOPEN_EXTENDED) \
424 && defined __UCLIBC_SUSV3_LEGACY__
425 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
426 microseconds. If INTERVAL is nonzero, when the alarm goes off, the
427 timer is reset to go off every INTERVAL microseconds thereafter.
428 Returns the number of microseconds remaining before the alarm. */
429 extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval)
432 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
435 This function is a cancellation point and therefore not marked with
437 extern int usleep (__useconds_t __useconds);
441 /* Suspend the process until a signal arrives.
442 This always returns -1 and sets `errno' to EINTR.
444 This function is a cancellation point and therefore not marked with
446 extern int pause (void);
449 /* Change the owner and group of FILE. */
450 extern int chown (__const char *__file, __uid_t __owner, __gid_t __group)
451 __THROW __nonnull ((1)) __wur;
452 libc_hidden_proto(chown)
454 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
455 /* Change the owner and group of the file that FD is open on. */
456 extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur;
459 /* Change owner and group of FILE, if it is a symbolic
460 link the ownership of the symbolic link is changed. */
461 extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group)
462 __THROW __nonnull ((1)) __wur;
464 #endif /* Use BSD || X/Open Unix. */
467 /* Change the owner and group of FILE relative to the directory FD is open
469 extern int fchownat (int __fd, __const char *__file, __uid_t __owner,
470 __gid_t __group, int __flag)
471 __THROW __nonnull ((2)) __wur;
472 #endif /* Use GNU. */
474 /* Change the process's working directory to PATH. */
475 extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur;
476 libc_hidden_proto(chdir)
478 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
479 /* Change the process's working directory to the one FD is open on. */
480 extern int fchdir (int __fd) __THROW __wur;
481 libc_hidden_proto(fchdir)
484 /* Get the pathname of the current working directory,
485 and put it in SIZE bytes of BUF. Returns NULL if the
486 directory couldn't be determined or SIZE was too small.
487 If successful, returns BUF. In GNU, if BUF is NULL,
488 an array is allocated with `malloc'; the array is SIZE
489 bytes long, unless SIZE == 0, in which case it is as
491 extern char *getcwd (char *__buf, size_t __size) __THROW __wur;
492 libc_hidden_proto(getcwd)
495 /* Return a malloc'd string containing the current directory name.
496 If the environment variable `PWD' is set, and its value is correct,
497 that value is used. */
498 extern char *get_current_dir_name (void) __THROW;
501 #if 0 /*defined __USE_BSD || defined __USE_XOPEN_EXTENDED*/
502 /* Put the absolute pathname of the current working directory in BUF.
503 If successful, return BUF. If not, put an error message in
504 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
505 extern char *getwd (char *__buf)
506 __THROW __nonnull ((1)) __attribute_deprecated__ __wur;
510 /* Duplicate FD, returning a new file descriptor on the same file. */
511 extern int dup (int __fd) __THROW __wur;
513 /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
514 extern int dup2 (int __fd, int __fd2) __THROW;
515 libc_hidden_proto(dup2)
517 /* NULL-terminated array of "NAME=VALUE" environment variables. */
518 extern char **__environ;
520 extern char **environ;
524 /* Replace the current process, executing PATH with arguments ARGV and
525 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
526 extern int execve (__const char *__path, char *__const __argv[],
527 char *__const __envp[]) __THROW __nonnull ((1));
528 libc_hidden_proto(execve)
530 #if 0 /*def __USE_GNU*/
531 /* Execute the file FD refers to, overlaying the running program image.
532 ARGV and ENVP are passed to the new program, as for `execve'. */
533 extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[])
538 /* Execute PATH with arguments ARGV and environment from `environ'. */
539 extern int execv (__const char *__path, char *__const __argv[])
540 __THROW __nonnull ((1));
541 libc_hidden_proto(execv)
543 /* Execute PATH with all arguments after PATH until a NULL pointer,
544 and the argument after that for environment. */
545 extern int execle (__const char *__path, __const char *__arg, ...)
546 __THROW __nonnull ((1));
547 libc_hidden_proto(execle)
549 /* Execute PATH with all arguments after PATH until
550 a NULL pointer and environment from `environ'. */
551 extern int execl (__const char *__path, __const char *__arg, ...)
552 __THROW __nonnull ((1));
553 libc_hidden_proto(execl)
555 /* Execute FILE, searching in the `PATH' environment variable if it contains
556 no slashes, with arguments ARGV and environment from `environ'. */
557 extern int execvp (__const char *__file, char *__const __argv[])
558 __THROW __nonnull ((1));
559 libc_hidden_proto(execvp)
561 /* Execute FILE, searching in the `PATH' environment variable if
562 it contains no slashes, with all arguments after FILE until a
563 NULL pointer and environment from `environ'. */
564 extern int execlp (__const char *__file, __const char *__arg, ...)
565 __THROW __nonnull ((1));
566 libc_hidden_proto(execlp)
569 #if defined __USE_MISC || defined __USE_XOPEN
570 /* Add INC to priority of the current process. */
571 extern int nice (int __inc) __THROW __wur;
575 /* Terminate program execution with the low-order 8 bits of STATUS. */
576 extern void _exit (int __status) __attribute__ ((__noreturn__));
577 libc_hidden_proto(_exit)
580 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
581 the `_SC_*' symbols for the NAME argument to `sysconf';
582 and the `_CS_*' symbols for the NAME argument to `confstr'. */
583 #include <bits/confname.h>
585 /* Get file-specific configuration information about PATH. */
586 extern long int pathconf (__const char *__path, int __name)
587 __THROW __nonnull ((1));
589 /* Get file-specific configuration about descriptor FD. */
590 extern long int fpathconf (int __fd, int __name) __THROW;
592 /* Get the value of the system variable NAME. */
593 extern long int sysconf (int __name) __THROW;
594 libc_hidden_proto(sysconf)
597 /* Get the value of the string-valued system variable NAME. */
598 extern size_t confstr (int __name, char *__buf, size_t __len) __THROW;
602 /* Get the process ID of the calling process. */
603 extern __pid_t getpid (void) __THROW;
604 libc_hidden_proto(getpid)
606 /* Get the process ID of the calling process's parent. */
607 extern __pid_t getppid (void) __THROW;
609 /* Get the process group ID of the calling process.
610 This function is different on old BSD. */
612 extern __pid_t getpgrp (void) __THROW;
614 # ifdef __REDIRECT_NTH
615 extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid);
617 # define getpgrp __getpgid
621 /* Get the process group ID of process PID. */
622 extern __pid_t __getpgid (__pid_t __pid) __THROW;
623 #ifdef __USE_XOPEN_EXTENDED
624 extern __pid_t getpgid (__pid_t __pid) __THROW;
628 /* Set the process group ID of the process matching PID to PGID.
629 If PID is zero, the current process's process group ID is set.
630 If PGID is zero, the process ID of the process is used. */
631 extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW;
632 libc_hidden_proto(setpgid)
634 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
635 /* Both System V and BSD have `setpgrp' functions, but with different
636 calling conventions. The BSD function is the same as POSIX.1 `setpgid'
637 (above). The System V function takes no arguments and puts the calling
638 process in its on group like `setpgid (0, 0)'.
640 New programs should always use `setpgid' instead.
642 The default in GNU is to provide the System V function. The BSD
643 function is available under -D_BSD_SOURCE. */
647 /* Set the process group ID of the calling process to its own PID.
648 This is exactly the same as `setpgid (0, 0)'. */
649 extern int setpgrp (void) __THROW;
653 /* Another name for `setpgid' (above). */
654 # ifdef __REDIRECT_NTH
655 extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid);
657 # define setpgrp setpgid
660 # endif /* Favor BSD. */
661 #endif /* Use SVID or BSD. */
663 /* Create a new session with the calling process as its leader.
664 The process group IDs of the session and the calling process
665 are set to the process ID of the calling process, which is returned. */
666 extern __pid_t setsid (void) __THROW;
667 libc_hidden_proto(setsid)
669 #ifdef __USE_XOPEN_EXTENDED
670 /* Return the session ID of the given process. */
671 extern __pid_t getsid (__pid_t __pid) __THROW;
672 libc_hidden_proto(getsid)
675 /* Get the real user ID of the calling process. */
676 extern __uid_t getuid (void) __THROW;
677 libc_hidden_proto(getuid)
679 /* Get the effective user ID of the calling process. */
680 extern __uid_t geteuid (void) __THROW;
681 libc_hidden_proto(geteuid)
683 /* Get the real group ID of the calling process. */
684 extern __gid_t getgid (void) __THROW;
685 libc_hidden_proto(getgid)
687 /* Get the effective group ID of the calling process. */
688 extern __gid_t getegid (void) __THROW;
689 libc_hidden_proto(getegid)
691 /* If SIZE is zero, return the number of supplementary groups
692 the calling process is in. Otherwise, fill in the group IDs
693 of its supplementary groups in LIST and return the number written. */
694 extern int getgroups (int __size, __gid_t __list[]) __THROW __wur;
695 libc_hidden_proto(getgroups)
697 #if 0 /*def __USE_GNU*/
698 /* Return nonzero iff the calling process is in group GID. */
699 extern int group_member (__gid_t __gid) __THROW;
702 /* Set the user ID of the calling process to UID.
703 If the calling process is the super-user, set the real
704 and effective user IDs, and the saved set-user-ID to UID;
705 if not, the effective user ID is set to UID. */
706 extern int setuid (__uid_t __uid) __THROW;
708 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
709 /* Set the real user ID of the calling process to RUID,
710 and the effective user ID of the calling process to EUID. */
711 extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW;
712 libc_hidden_proto(setreuid)
715 #if defined __USE_BSD || defined __USE_XOPEN2K
716 /* Set the effective user ID of the calling process to UID. */
717 extern int seteuid (__uid_t __uid) __THROW;
718 libc_hidden_proto(seteuid)
719 #endif /* Use BSD. */
721 /* Set the group ID of the calling process to GID.
722 If the calling process is the super-user, set the real
723 and effective group IDs, and the saved set-group-ID to GID;
724 if not, the effective group ID is set to GID. */
725 extern int setgid (__gid_t __gid) __THROW;
727 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
728 /* Set the real group ID of the calling process to RGID,
729 and the effective group ID of the calling process to EGID. */
730 extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW;
731 libc_hidden_proto(setregid)
734 #if defined __USE_BSD || defined __USE_XOPEN2K
735 /* Set the effective group ID of the calling process to GID. */
736 extern int setegid (__gid_t __gid) __THROW;
737 #endif /* Use BSD. */
740 /* Fetch the real user ID, effective user ID, and saved-set user ID,
741 of the calling process. */
742 extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid)
745 /* Fetch the real group ID, effective group ID, and saved-set group ID,
746 of the calling process. */
747 extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid)
750 #if defined __UCLIBC_LINUX_SPECIFIC__
751 /* Set the real user ID, effective user ID, and saved-set user ID,
752 of the calling process to RUID, EUID, and SUID, respectively. */
753 extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid)
755 libc_hidden_proto(setresuid)
758 /* Set the real group ID, effective group ID, and saved-set group ID,
759 of the calling process to RGID, EGID, and SGID, respectively. */
760 extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid)
762 libc_hidden_proto(setresgid)
766 #if defined __UCLIBC_HAS_STUBS__ || defined __ARCH_USE_MMU__
767 /* Clone the calling process, creating an exact copy.
768 Return -1 for errors, 0 to the new process,
769 and the process ID of the new process to the old process. */
770 extern __pid_t fork (void) __THROW;
772 extern __typeof(fork) __libc_fork;
773 libc_hidden_proto(fork)
777 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
778 /* Clone the calling process, but without copying the whole address space.
779 The calling process is suspended until the new process exits or is
780 replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
781 and the process ID of the new process to the old process. */
782 extern __pid_t vfork (void) __THROW;
783 libc_hidden_proto(vfork)
784 #endif /* Use BSD. */
786 /* Special exit function which only terminates the current thread. */
787 extern void __exit_thread (int val) __attribute__ ((__noreturn__));
789 /* Return the pathname of the terminal FD is open on, or NULL on errors.
790 The returned storage is good only until the next call to this function. */
791 extern char *ttyname (int __fd) __THROW;
793 /* Store at most BUFLEN characters of the pathname of the terminal FD is
794 open on in BUF. Return 0 on success, otherwise an error number. */
795 extern int ttyname_r (int __fd, char *__buf, size_t __buflen)
796 __THROW __nonnull ((2)) __wur;
797 libc_hidden_proto(ttyname_r)
799 /* Return 1 if FD is a valid descriptor associated
800 with a terminal, zero if not. */
801 extern int isatty (int __fd) __THROW;
802 libc_hidden_proto(isatty)
805 #if 0 /*defined __USE_BSD \
806 || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)*/
807 /* Return the index into the active-logins file (utmp) for
808 the controlling terminal. */
809 extern int ttyslot (void) __THROW;
813 /* Make a link to FROM named TO. */
814 extern int link (__const char *__from, __const char *__to)
815 __THROW __nonnull ((1, 2)) __wur;
818 /* Like link but relative paths in TO and FROM are interpreted relative
819 to FROMFD and TOFD respectively. */
820 extern int linkat (int __fromfd, __const char *__from, int __tofd,
821 __const char *__to, int __flags)
822 __THROW __nonnull ((2, 4)) __wur;
825 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
826 /* Make a symbolic link to FROM named TO. */
827 extern int symlink (__const char *__from, __const char *__to)
828 __THROW __nonnull ((1, 2)) __wur;
830 /* Read the contents of the symbolic link PATH into no more than
831 LEN bytes of BUF. The contents are not null-terminated.
832 Returns the number of characters read, or -1 for errors. */
833 extern ssize_t readlink (__const char *__restrict __path,
834 char *__restrict __buf, size_t __len)
835 __THROW __nonnull ((1, 2)) __wur;
836 libc_hidden_proto(readlink)
837 #endif /* Use BSD. */
840 /* Like symlink but a relative path in TO is interpreted relative to TOFD. */
841 extern int symlinkat (__const char *__from, int __tofd,
842 __const char *__to) __THROW __nonnull ((1, 3)) __wur;
844 /* Like readlink but a relative PATH is interpreted relative to FD. */
845 extern ssize_t readlinkat (int __fd, __const char *__restrict __path,
846 char *__restrict __buf, size_t __len)
847 __THROW __nonnull ((2, 3)) __wur;
850 /* Remove the link NAME. */
851 extern int unlink (__const char *__name) __THROW __nonnull ((1));
852 libc_hidden_proto(unlink)
855 /* Remove the link NAME relative to FD. */
856 extern int unlinkat (int __fd, __const char *__name, int __flag)
857 __THROW __nonnull ((2));
860 /* Remove the directory PATH. */
861 extern int rmdir (__const char *__path) __THROW __nonnull ((1));
862 libc_hidden_proto(rmdir)
865 /* Return the foreground process group ID of FD. */
866 extern __pid_t tcgetpgrp (int __fd) __THROW;
867 libc_hidden_proto(tcgetpgrp)
869 /* Set the foreground process group ID of FD set PGRP_ID. */
870 extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW;
873 /* Return the login name of the user.
875 This function is a possible cancellation points and therefore not
876 marked with __THROW. */
877 extern char *getlogin (void);
878 libc_hidden_proto(getlogin)
879 #if defined __USE_REENTRANT || defined __USE_POSIX199506
880 /* Return at most NAME_LEN characters of the login name of the user in NAME.
881 If it cannot be determined or some other error occurred, return the error
882 code. Otherwise return 0.
884 This function is a possible cancellation points and therefore not
885 marked with __THROW. */
886 extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1));
889 #if 0 /*def __USE_BSD*/
890 /* Set the login name returned by `getlogin'. */
891 extern int setlogin (__const char *__name) __THROW __nonnull ((1));
896 /* Get definitions and prototypes for functions to process the
897 arguments in ARGV (ARGC of them, minus the program name) for
898 options given in OPTS. */
899 # define __need_getopt
900 /* keep this for uClibc in bits/, we need it when GNU_GETOPT is disabled */
901 # include <bits/getopt.h>
905 #if defined __USE_BSD || defined __USE_UNIX98
906 /* Put the name of the current host in no more than LEN bytes of NAME.
907 The result is null-terminated if LEN is large enough for the full
908 name and the terminator. */
909 extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1));
910 libc_hidden_proto(gethostname)
914 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
915 /* Set the name of the current host to NAME, which is LEN bytes long.
916 This call is restricted to the super-user. */
917 extern int sethostname (__const char *__name, size_t __len)
918 __THROW __nonnull ((1)) __wur;
920 /* Set the current machine's Internet number to ID.
921 This call is restricted to the super-user. */
922 extern int sethostid (long int __id) __THROW __wur;
924 #if defined __UCLIBC_BSD_SPECIFIC__ || defined _LIBC
925 /* Get and set the NIS (aka YP) domain name, if any.
926 Called just like `gethostname' and `sethostname'.
927 The NIS domain name is usually the empty string when not using NIS. */
928 extern int getdomainname (char *__name, size_t __len)
929 __THROW __nonnull ((1)) __wur;
930 libc_hidden_proto(getdomainname)
932 #if defined __UCLIBC_BSD_SPECIFIC__
933 extern int setdomainname (__const char *__name, size_t __len)
934 __THROW __nonnull ((1)) __wur;
937 #if defined __UCLIBC_LINUX_SPECIFIC__
938 /* Revoke access permissions to all processes currently communicating
939 with the control terminal, and then send a SIGHUP signal to the process
940 group of the control terminal. */
941 extern int vhangup (void) __THROW;
945 /* Revoke the access of all descriptors currently open on FILE. */
946 extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur;
949 /* Enable statistical profiling, writing samples of the PC into at most
950 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
951 is enabled, the system examines the user PC and increments
952 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
953 disable profiling. Returns zero on success, -1 on error. */
954 extern int profil (unsigned short int *__sample_buffer, size_t __size,
955 size_t __offset, unsigned int __scale)
956 __THROW __nonnull ((1));
960 /* Turn accounting on if NAME is an existing file. The system will then write
961 a record for each process as it terminates, to this file. If NAME is NULL,
962 turn accounting off. This call is restricted to the super-user. */
963 extern int acct (__const char *__name) __THROW;
966 /* Successive calls return the shells listed in `/etc/shells'. */
967 extern char *getusershell (void) __THROW;
968 extern void endusershell (void) __THROW; /* Discard cached info. */
969 libc_hidden_proto(endusershell)
970 extern void setusershell (void) __THROW; /* Rewind and re-read the file. */
971 libc_hidden_proto(setusershell)
974 /* Put the program in the background, and dissociate from the controlling
975 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
976 redirects stdin, stdout, and stderr to /dev/null. */
977 extern int daemon (int __nochdir, int __noclose) __THROW __wur;
978 #endif /* Use BSD || X/Open. */
981 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
982 /* Make PATH be the root directory (the starting point for absolute paths).
983 This call is restricted to the super-user. */
984 extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur;
986 /* Prompt with PROMPT and read a string from the terminal without echoing.
987 Uses /dev/tty if possible; otherwise stderr and stdin. */
988 extern char *getpass (__const char *__prompt) __nonnull ((1));
989 #endif /* Use BSD || X/Open. */
992 #if defined __USE_BSD || defined __USE_XOPEN
993 /* Make all changes done to FD actually appear on disk.
995 This function is a cancellation point and therefore not marked with
997 extern int fsync (int __fd);
998 #endif /* Use BSD || X/Open. */
1001 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
1003 /* Return identifier for the current host. */
1004 extern long int gethostid (void);
1006 /* Make all changes done to all files actually appear on disk. */
1007 extern void sync (void) __THROW;
1010 /* Return the number of bytes in a page. This is the system's page size,
1011 which is not necessarily the same as the hardware page size. */
1012 extern int getpagesize (void) __THROW __attribute__ ((__const__));
1013 libc_hidden_proto(getpagesize)
1016 /* Return the maximum number of file descriptors
1017 the current process could possibly have. */
1018 extern int getdtablesize (void) __THROW;
1019 libc_hidden_proto(getdtablesize)
1022 /* Truncate FILE to LENGTH bytes. */
1023 # ifndef __USE_FILE_OFFSET64
1024 extern int truncate (__const char *__file, __off_t __length)
1025 __THROW __nonnull ((1)) __wur;
1026 libc_hidden_proto(truncate)
1028 # ifdef __REDIRECT_NTH
1029 extern int __REDIRECT_NTH (truncate,
1030 (__const char *__file, __off64_t __length),
1031 truncate64) __nonnull ((1)) __wur;
1033 # define truncate truncate64
1036 # ifdef __USE_LARGEFILE64
1037 extern int truncate64 (__const char *__file, __off64_t __length)
1038 __THROW __nonnull ((1)) __wur;
1041 #endif /* Use BSD || X/Open Unix. */
1043 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
1045 /* Truncate the file FD is open on to LENGTH bytes. */
1046 # ifndef __USE_FILE_OFFSET64
1047 extern int ftruncate (int __fd, __off_t __length) __THROW __wur;
1048 libc_hidden_proto(ftruncate)
1050 # ifdef __REDIRECT_NTH
1051 extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length),
1054 # define ftruncate ftruncate64
1057 # ifdef __USE_LARGEFILE64
1058 extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur;
1059 libc_hidden_proto(ftruncate64)
1062 #endif /* Use BSD || X/Open Unix || POSIX 2003. */
1065 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
1067 /* Set the end of accessible data space (aka "the break") to ADDR.
1068 Returns zero on success and -1 for errors (with errno set). */
1069 extern int brk (void *__addr) __THROW __wur;
1070 libc_hidden_proto(brk)
1072 /* Increase or decrease the end of accessible data space by DELTA bytes.
1073 If successful, returns the address the previous end of data space
1074 (i.e. the beginning of the new space, if DELTA > 0);
1075 returns (void *) -1 for errors (with errno set). */
1076 extern void *sbrk (intptr_t __delta) __THROW;
1077 libc_hidden_proto(sbrk)
1082 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
1083 This is completely system-dependent, and not often useful.
1085 In Unix, `syscall' sets `errno' for all errors and most calls return -1
1086 for errors; in many systems you cannot pass arguments or get return
1087 values for all system calls (`pipe', `fork', and `getppid' typically
1090 In Mach, all system calls take normal arguments and always return an
1091 error code (zero for success). */
1092 extern long int syscall (long int __sysno, ...) __THROW;
1094 #endif /* Use misc. */
1097 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
1098 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
1099 files consistent. Some systems have them there and some here, and some
1100 software depends on the macros being defined without including both. */
1102 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
1103 LEN is always relative to the current file position.
1104 The CMD argument is one of the following.
1106 This function is a cancellation point and therefore not marked with
1109 # define F_ULOCK 0 /* Unlock a previously locked region. */
1110 # define F_LOCK 1 /* Lock a region for exclusive use. */
1111 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
1112 # define F_TEST 3 /* Test a region for other processes locks. */
1114 # ifndef __USE_FILE_OFFSET64
1115 extern int lockf (int __fd, int __cmd, __off_t __len) __wur;
1116 libc_hidden_proto(lockf)
1119 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len),
1122 # define lockf lockf64
1125 # ifdef __USE_LARGEFILE64
1126 extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur;
1128 #endif /* Use misc and F_LOCK not already defined. */
1133 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
1136 # define TEMP_FAILURE_RETRY(expression) \
1138 ({ long int __result; \
1139 do __result = (long int) (expression); \
1140 while (__result == -1L && errno == EINTR); \
1144 #if (defined __USE_POSIX199309 || defined __USE_UNIX98) \
1145 && defined __UCLIBC_HAS_REALTIME__
1146 /* Synchronize at least the data part of a file with the underlying
1148 extern int fdatasync (int __fildes) __THROW;
1149 #endif /* Use POSIX199309 */
1152 /* XPG4.2 specifies that prototypes for the encryption functions must
1155 # if defined __UCLIBC_HAS_CRYPT__
1156 /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
1157 extern char *crypt (__const char *__key, __const char *__salt)
1158 __THROW __nonnull ((1, 2));
1160 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
1162 extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1));
1163 # endif /* __UCLIBC_HAS_CRYPT__ */
1166 /* Swab pairs bytes in the first N bytes of the area pointed to by
1167 FROM and copy the result to TO. The value of TO must not be in the
1168 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
1169 is without partner. */
1170 extern void swab (__const void *__restrict __from, void *__restrict __to,
1171 ssize_t __n) __THROW __nonnull ((1, 2));
1175 /* The Single Unix specification demands this prototype to be here.
1176 It is also found in <stdio.h>. */
1178 /* Return the name of the controlling terminal. */
1179 extern char *ctermid (char *__s) __THROW;
1183 /* Define some macros helping to catch buffer overflows. */
1184 #if __USE_FORTIFY_LEVEL > 0 && !defined __cplusplus
1185 # include <bits/unistd.h>
1192 #ifndef smallint_type /* if arch didn't override it in bits/wordsize.h */
1193 #define smallint_type int
1195 typedef signed smallint_type smallint;
1196 typedef unsigned smallint_type smalluint;
1200 #endif /* unistd.h */