1 /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
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 August, 1988 and
34 extended by POSIX-1b (aka POSIX-4) and POSIX-1c (aka POSIX threads). */
35 #define _POSIX_VERSION 199506L
37 /* These are not #ifdef __USE_POSIX2 because they are
38 in the theoretically application-owned namespace. */
40 /* POSIX Standard approved as ISO/IEC 9945-2 as of December, 1993. */
41 #define _POSIX2_C_VERSION 199209L
43 /* The utilities on GNU systems also correspond to this version. */
44 #define _POSIX2_VERSION 199209L
46 /* If defined, the implementation supports the
47 C Language Bindings Option. */
48 #define _POSIX2_C_BIND 1
50 /* If defined, the implementation supports the
51 C Language Development Utilities Option. */
52 #define _POSIX2_C_DEV 1
54 /* If defined, the implementation supports the
55 Software Development Utilities Option. */
56 #define _POSIX2_SW_DEV 1
58 /* If defined, the implementation supports the
59 creation of locales with the localedef utility. */
60 #define _POSIX2_LOCALEDEF 1
62 /* X/Open version number to which the library conforms. It is selectable. */
64 # define _XOPEN_VERSION 500
66 # define _XOPEN_VERSION 4
69 /* Commands and utilities from XPG4 are available. */
70 #define _XOPEN_XCU_VERSION 4
72 /* We are compatible with the old published standards as well. */
77 /* The X/Open Unix extensions are available. */
80 /* Encryption is present. */
81 #define _XOPEN_CRYPT 1
83 /* The enhanced internationalization capabilities according to XPG4.2
85 #define _XOPEN_ENH_I18N 1
87 /* The legacy interfaces are also available. */
88 #define _XOPEN_LEGACY 1
91 /* Get values of POSIX options:
93 If these symbols are defined, the corresponding features are
94 always available. If not, they may be available sometimes.
95 The current values can be obtained with `sysconf'.
97 _POSIX_JOB_CONTROL Job control is supported.
98 _POSIX_SAVED_IDS Processes have a saved set-user-ID
99 and a saved set-group-ID.
100 _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.
101 _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.
102 _POSIX_TIMERS POSIX.4 clocks and timers are supported.
103 _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.
104 _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.
105 _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.
106 _POSIX_FSYNC The fsync function is present.
107 _POSIX_MAPPED_FILES Mapping of files to memory is supported.
108 _POSIX_MEMLOCK Locking of all memory is supported.
109 _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.
110 _POSIX_MEMORY_PROTECTION Setting of memory protections is supported.
111 _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.
112 _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.
113 _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
114 _POSIX_THREADS POSIX.1c pthreads are supported.
115 _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
116 _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
117 _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
118 _POSIX_THREAD_PRIORITY_SCHEDULING
119 POSIX.1c thread execution scheduling supported.
120 _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.
121 _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.
122 _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
123 _POSIX_PII Protocol-independent interfaces are supported.
124 _POSIX_PII_XTI XTI protocol-indep. interfaces are supported.
125 _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.
126 _POSIX_PII_INTERNET Internet family of protocols supported.
127 _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.
128 _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.
129 _POSIX_PII_OSI ISO/OSI family of protocols supported.
130 _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.
131 _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.
132 _POSIX_POLL Implementation supports `poll' function.
133 _POSIX_SELECT Implementation supports `select' and `pselect'.
135 _XOPEN_REALTIME X/Open realtime support is available.
136 _XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
137 _XOPEN_SHM Shared memory interface according to XPG4.2.
139 _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
140 int, long, pointer, and off_t types.
141 _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit
142 int, long, and pointer and off_t with at least
144 _XBS5_LP64_OFF64 Implementation provides environment with 32-bit
145 int, and 64-bit long, pointer, and off_t types.
146 _XBS5_LPBIG_OFFBIG Implementation provides environment with at
147 least 32 bits int and long, pointer, and off_t
148 with at least 64 bits.
150 If any of these symbols is defined as -1, the corresponding option is not
151 true for any file. If any is defined as other than -1, the corresponding
152 option is true for all files. If a symbol is not defined at all, the value
153 for a specific file can be obtained from `pathconf' and `fpathconf'.
155 _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
156 the owner of a file. `chown' can only be used
157 to change the group ID of a file to a group of
158 which the calling process is a member.
159 _POSIX_NO_TRUNC Pathname components longer than
160 NAME_MAX generate an error.
161 _POSIX_VDISABLE If defined, if the value of an element of the
162 `c_cc' member of `struct termios' is
163 _POSIX_VDISABLE, no character will have the
164 effect associated with that element.
165 _POSIX_SYNC_IO Synchronous I/O may be performed.
166 _POSIX_ASYNC_IO Asynchronous I/O may be performed.
167 _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.
169 Support for the Large File Support interface is not generally available.
170 If it is available the following constants are defined to one.
171 _LFS64_LARGEFILE Low-level I/O supports large files.
172 _LFS64_STDIO Standard I/O supports large files.
175 #include <bits/posix_opt.h>
177 /* Get the environment definitions from Unix98. */
179 # include <bits/environments.h>
182 /* Standard file descriptors. */
183 #define STDIN_FILENO 0 /* Standard input. */
184 #define STDOUT_FILENO 1 /* Standard output. */
185 #define STDERR_FILENO 2 /* Standard error output. */
188 /* All functions that are not declared anywhere else. */
190 #include <bits/types.h>
193 typedef __ssize_t ssize_t
;
194 # define ssize_t ssize_t
197 #define __need_size_t
202 /* The Single Unix specification says that some more types are
205 typedef __gid_t gid_t
;
210 typedef __uid_t uid_t
;
215 # ifndef __USE_FILE_OFFSET64
216 typedef __off_t off_t
;
218 typedef __off64_t off_t
;
222 # if defined __USE_LARGEFILE64 && !defined off64_t
223 typedef __off64_t off64_t
;
224 # define off64_t off64_t
228 typedef __pid_t pid_t
;
233 /* Values for the second argument to access.
234 These may be OR'd together. */
235 #define R_OK 4 /* Test for read permission. */
236 #define W_OK 2 /* Test for write permission. */
237 #define X_OK 1 /* Test for execute permission. */
238 #define F_OK 0 /* Test for existence. */
240 /* Test for access to NAME using the real UID and real GID. */
241 extern int __access
__P ((__const
char *__name
, int __type
));
242 extern int access
__P ((__const
char *__name
, int __type
));
245 /* Test for access to NAME using the effective UID and GID
246 (as normal file operations use). */
247 extern int __euidaccess
__P ((__const
char *__name
, int __type
));
248 extern int euidaccess
__P ((__const
char *__name
, int __type
));
252 /* Values for the WHENCE argument to lseek. */
253 #ifndef _STDIO_H /* <stdio.h> has the same definitions. */
254 # define SEEK_SET 0 /* Seek from beginning of file. */
255 # define SEEK_CUR 1 /* Seek from current position. */
256 # define SEEK_END 2 /* Seek from end of file. */
259 #if defined __USE_BSD && !defined L_SET
260 /* Old BSD names for the same constants; just for compatibility. */
261 # define L_SET SEEK_SET
262 # define L_INCR SEEK_CUR
263 # define L_XTND SEEK_END
267 /* Move FD's file position to OFFSET bytes from the
268 beginning of the file (if WHENCE is SEEK_SET),
269 the current position (if WHENCE is SEEK_CUR),
270 or the end of the file (if WHENCE is SEEK_END).
271 Return the new file position. */
272 extern __off_t __lseek
__P ((int __fd
, __off_t __offset
, int __whence
));
273 #ifndef __USE_FILE_OFFSET64
274 extern __off_t lseek
__P ((int __fd
, __off_t __offset
, int __whence
));
276 extern __off_t lseek
__P ((int __fd
, __off64_t __offset
, int __whence
))
279 #ifdef __USE_LARGEFILE64
280 extern __off64_t lseek64
__P ((int __fd
, __off64_t __offset
, int __whence
));
283 /* Close the file descriptor FD. */
284 extern int __close
__P ((int __fd
));
285 extern int close
__P ((int __fd
));
287 /* Read NBYTES into BUF from FD. Return the
288 number read, -1 for errors or 0 for EOF. */
289 extern ssize_t __read
__P ((int __fd
, __ptr_t __buf
, size_t __nbytes
));
290 extern ssize_t read
__P ((int __fd
, __ptr_t __buf
, size_t __nbytes
));
292 /* Write N bytes of BUF to FD. Return the number written, or -1. */
293 extern ssize_t __write
__P ((int __fd
, __const __ptr_t __buf
, size_t __n
));
294 extern ssize_t write
__P ((int __fd
, __const __ptr_t __buf
, size_t __n
));
297 /* Read NBYTES into BUF from FD at the given position OFFSET without
298 changing the file pointer. Return the number read, -1 for errors
300 extern ssize_t __pread
__P ((int __fd
, __ptr_t __buf
, size_t __nbytes
,
302 # ifndef __USE_FILE_OFFSET64
303 extern ssize_t pread
__P ((int __fd
, __ptr_t __buf
, size_t __nbytes
,
306 extern ssize_t pread
__P ((int __fd
, __ptr_t __buf
, size_t __nbytes
,
307 __off64_t __offset
)) __asm__ ("pread64");
309 extern ssize_t __pread64
__P ((int __fd
, __ptr_t __buf
, size_t __nbytes
,
310 __off64_t __offset
));
311 # ifdef __USE_LARGEFILE64
312 extern ssize_t pread64
__P ((int __fd
, __ptr_t __buf
, size_t __nbytes
,
313 __off64_t __offset
));
316 /* Write N bytes of BUF to FD at the given position OFFSET without
317 changing the file pointer. Return the number written, or -1. */
318 extern ssize_t __pwrite
__P ((int __fd
, __const __ptr_t __buf
, size_t __n
,
320 # ifndef __USE_FILE_OFFSET64
321 extern ssize_t pwrite
__P ((int __fd
, __const __ptr_t __buf
, size_t __n
,
324 extern ssize_t pwrite
__P ((int __fd
, __const __ptr_t __buf
, size_t __n
,
325 __off64_t __offset
)) __asm__ ("pwrite64");
327 extern ssize_t __pwrite64
__P ((int __fd
, __const __ptr_t __buf
, size_t __n
,
328 __off64_t __offset
));
329 # ifdef __USE_LARGEFILE64
330 extern ssize_t pwrite64
__P ((int __fd
, __const __ptr_t __buf
, size_t __n
,
331 __off64_t __offset
));
336 /* Create a one-way communication channel (pipe).
337 If successful, two file descriptors are stored in PIPEDES;
338 bytes written on PIPEDES[1] can be read from PIPEDES[0].
339 Returns 0 if successful, -1 if not. */
340 extern int __pipe
__P ((int __pipedes
[2]));
341 extern int pipe
__P ((int __pipedes
[2]));
343 /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
344 If SECONDS is zero, any currently scheduled alarm will be cancelled.
345 The function returns the number of seconds remaining until the last
346 alarm scheduled would have signaled, or zero if there wasn't one.
347 There is no return value to indicate an error, but you can set `errno'
348 to 0 and check its value after calling `alarm', and this might tell you.
349 The signal may come late due to processor scheduling. */
350 extern unsigned int alarm
__P ((unsigned int __seconds
));
352 /* Make the process sleep for SECONDS seconds, or until a signal arrives
353 and is not ignored. The function returns the number of seconds less
354 than SECONDS which it actually slept (thus zero if it slept the full time).
355 If a signal handler does a `longjmp' or modifies the handling of the
356 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
357 signal afterwards is undefined. There is no return value to indicate
358 error, but if `sleep' returns SECONDS, it probably didn't work. */
359 extern unsigned int __sleep
__P ((unsigned int __seconds
));
360 extern unsigned int sleep
__P ((unsigned int __seconds
));
362 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
363 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
364 microseconds. If INTERVAL is nonzero, when the alarm goes off, the
365 timer is reset to go off every INTERVAL microseconds thereafter.
366 Returns the number of microseconds remaining before the alarm. */
367 extern unsigned int ualarm
__P ((unsigned int __value
,
368 unsigned int __interval
));
370 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
372 extern void usleep
__P ((unsigned int __useconds
));
376 /* Suspend the process until a signal arrives.
377 This always returns -1 and sets `errno' to EINTR. */
378 extern int pause
__P ((void));
381 /* Change the owner and group of FILE. */
382 extern int __chown
__P ((__const
char *__file
,
383 __uid_t __owner
, __gid_t __group
));
384 extern int chown
__P ((__const
char *__file
,
385 __uid_t __owner
, __gid_t __group
));
387 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
388 /* Change the owner and group of the file that FD is open on. */
389 extern int __fchown
__P ((int __fd
,
390 __uid_t __owner
, __gid_t __group
));
391 extern int fchown
__P ((int __fd
,
392 __uid_t __owner
, __gid_t __group
));
395 /* Change owner and group of FILE, if it is a symbolic
396 link the ownership of the symbolic link is changed. */
397 extern int __lchown
__P ((__const
char *__file
, __uid_t __owner
,
399 extern int lchown
__P ((__const
char *__file
, __uid_t __owner
,
402 #endif /* Use BSD || X/Open Unix. */
404 /* Change the process's working directory to PATH. */
405 extern int __chdir
__P ((__const
char *__path
));
406 extern int chdir
__P ((__const
char *__path
));
408 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
409 /* Change the process's working directory to the one FD is open on. */
410 extern int __fchdir
__P ((int __fd
));
411 extern int fchdir
__P ((int __fd
));
414 /* Get the pathname of the current working directory,
415 and put it in SIZE bytes of BUF. Returns NULL if the
416 directory couldn't be determined or SIZE was too small.
417 If successful, returns BUF. In GNU, if BUF is NULL,
418 an array is allocated with `malloc'; the array is SIZE
419 bytes long, unless SIZE == 0, in which case it is as
421 extern char *__getcwd
__P ((char *__buf
, size_t __size
));
422 extern char *getcwd
__P ((char *__buf
, size_t __size
));
425 /* Return a malloc'd string containing the current directory name.
426 If the environment variable `PWD' is set, and its value is correct,
427 that value is used. */
428 extern char *get_current_dir_name
__P ((void));
430 /* Get the canonical absolute name of the named directory, and put it in SIZE
431 bytes of BUF. Returns NULL if the directory couldn't be determined or
432 SIZE was too small. If successful, returns BUF. In GNU, if BUF is
433 NULL, an array is allocated with `malloc'; the array is SIZE bytes long,
434 unless SIZE <= 0, in which case it is as big as necessary. */
436 char *__canonicalize_directory_name_internal
__P ((__const
char *__thisdir
,
441 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
442 /* Put the absolute pathname of the current working directory in BUF.
443 If successful, return BUF. If not, put an error message in
444 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
445 extern char *getwd
__P ((char *__buf
));
449 /* Duplicate FD, returning a new file descriptor on the same file. */
450 extern int __dup
__P ((int __fd
));
451 extern int dup
__P ((int __fd
));
453 /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
454 extern int __dup2
__P ((int __fd
, int __fd2
));
455 extern int dup2
__P ((int __fd
, int __fd2
));
457 /* NULL-terminated array of "NAME=VALUE" environment variables. */
458 extern char **__environ
;
460 extern char **environ
;
464 /* Replace the current process, executing PATH with arguments ARGV and
465 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
466 extern int __execve
__P ((__const
char *__path
, char *__const __argv
[],
467 char *__const __envp
[]));
468 extern int execve
__P ((__const
char *__path
, char *__const __argv
[],
469 char *__const __envp
[]));
472 /* Execute the file FD refers to, overlaying the running program image.
473 ARGV and ENVP are passed to the new program, as for `execve'. */
474 extern int fexecve
__P ((int __fd
,
475 char *__const __argv
[], char *__const __envp
[]));
480 /* Execute PATH with arguments ARGV and environment from `environ'. */
481 extern int execv
__P ((__const
char *__path
, char *__const __argv
[]));
483 /* Execute PATH with all arguments after PATH until a NULL pointer,
484 and the argument after that for environment. */
485 extern int execle
__P ((__const
char *__path
, __const
char *__arg
, ...));
487 /* Execute PATH with all arguments after PATH until
488 a NULL pointer and environment from `environ'. */
489 extern int execl
__P ((__const
char *__path
, __const
char *__arg
, ...));
491 /* Execute FILE, searching in the `PATH' environment variable if it contains
492 no slashes, with arguments ARGV and environment from `environ'. */
493 extern int execvp
__P ((__const
char *__file
, char *__const __argv
[]));
495 /* Execute FILE, searching in the `PATH' environment variable if
496 it contains no slashes, with all arguments after FILE until a
497 NULL pointer and environment from `environ'. */
498 extern int execlp
__P ((__const
char *__file
, __const
char *__arg
, ...));
501 #if defined __USE_MISC || defined __USE_XOPEN
502 /* Add INC to priority of the current process. */
503 extern int nice
__P ((int __inc
));
507 /* Terminate program execution with the low-order 8 bits of STATUS. */
508 extern void _exit
__P ((int __status
)) __attribute__ ((__noreturn__
));
511 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
512 the `_SC_*' symbols for the NAME argument to `sysconf';
513 and the `_CS_*' symbols for the NAME argument to `confstr'. */
514 #include <bits/confname.h>
516 /* Get file-specific configuration information about PATH. */
517 extern long int __pathconf
__P ((__const
char *__path
, int __name
));
518 extern long int pathconf
__P ((__const
char *__path
, int __name
));
520 /* Get file-specific configuration about descriptor FD. */
521 extern long int __fpathconf
__P ((int __fd
, int __name
));
522 extern long int fpathconf
__P ((int __fd
, int __name
));
524 /* Get the value of the system variable NAME. */
525 extern long int __sysconf
__P ((int __name
));
526 extern long int sysconf
__P ((int __name
));
529 /* Get the value of the string-valued system variable NAME. */
530 extern size_t confstr
__P ((int __name
, char *__buf
, size_t __len
));
534 /* Get the process ID of the calling process. */
535 extern __pid_t __getpid
__P ((void));
536 extern __pid_t getpid
__P ((void));
538 /* Get the process ID of the calling process's parent. */
539 extern __pid_t __getppid
__P ((void));
540 extern __pid_t getppid
__P ((void));
542 /* Get the process group ID of the calling process. */
543 extern __pid_t getpgrp
__P ((void));
544 /* The old BSD definition is a bit different. */
545 extern __pid_t __bsd_getpgrp
__P ((__pid_t __pid
));
547 /* When we explicitely compile BSD sources use the BSD definition of this
548 function. Please note that we cannot use parameters for the macro. */
549 # define getpgrp __bsd_getpgrp
552 /* Set the process group ID of the process matching PID to PGID.
553 If PID is zero, the current process's process group ID is set.
554 If PGID is zero, the process ID of the process is used. */
555 extern int __setpgid
__P ((__pid_t __pid
, __pid_t __pgid
));
556 extern int setpgid
__P ((__pid_t __pid
, __pid_t __pgid
));
558 /* Get the process group ID of process PID. */
559 extern __pid_t __getpgid
__P ((__pid_t __pid
));
560 #ifdef __USE_XOPEN_EXTENDED
561 extern __pid_t getpgid
__P ((__pid_t __pid
));
564 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
565 /* Both System V and BSD have `setpgrp' functions, but with different
566 calling conventions. The BSD function is the same as POSIX.1 `setpgid'
567 (above). The System V function takes no arguments and puts the calling
568 process in its on group like `setpgid (0, 0)'.
570 New programs should always use `setpgid' instead.
572 The default in GNU is to provide the System V function. The BSD
573 function is available under -D_BSD_SOURCE with -lbsd-compat. */
577 /* Set the process group ID of the calling process to its own PID.
578 This is exactly the same as `setpgid (0, 0)'. */
579 extern int setpgrp
__P ((void));
583 /* Another name for `setpgid' (above). */
584 extern int setpgrp
__P ((__pid_t __pid
, __pid_t __pgrp
));
586 # endif /* Favor BSD. */
587 #endif /* Use SVID or BSD. */
589 /* Create a new session with the calling process as its leader.
590 The process group IDs of the session and the calling process
591 are set to the process ID of the calling process, which is returned. */
592 extern __pid_t __setsid
__P ((void));
593 extern __pid_t setsid
__P ((void));
595 #ifdef __USE_XOPEN_EXTENDED
596 /* Return the session ID of the given process. */
597 extern __pid_t getsid
__P ((__pid_t __pid
));
600 /* Get the real user ID of the calling process. */
601 extern __uid_t __getuid
__P ((void));
602 extern __uid_t getuid
__P ((void));
604 /* Get the effective user ID of the calling process. */
605 extern __uid_t __geteuid
__P ((void));
606 extern __uid_t geteuid
__P ((void));
608 /* Get the real group ID of the calling process. */
609 extern __gid_t __getgid
__P ((void));
610 extern __gid_t getgid
__P ((void));
612 /* Get the effective group ID of the calling process. */
613 extern __gid_t __getegid
__P ((void));
614 extern __gid_t getegid
__P ((void));
616 /* If SIZE is zero, return the number of supplementary groups
617 the calling process is in. Otherwise, fill in the group IDs
618 of its supplementary groups in LIST and return the number written. */
619 extern int __getgroups
__P ((int __size
, __gid_t __list
[]));
620 extern int getgroups
__P ((int __size
, __gid_t __list
[]));
623 /* Return nonzero iff the calling process is in group GID. */
624 extern int __group_member
__P ((__gid_t __gid
));
625 extern int group_member
__P ((__gid_t __gid
));
628 /* Set the user ID of the calling process to UID.
629 If the calling process is the super-user, set the real
630 and effective user IDs, and the saved set-user-ID to UID;
631 if not, the effective user ID is set to UID. */
632 extern int __setuid
__P ((__uid_t __uid
));
633 extern int setuid
__P ((__uid_t __uid
));
635 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
636 /* Set the real user ID of the calling process to RUID,
637 and the effective user ID of the calling process to EUID. */
638 extern int __setreuid
__P ((__uid_t __ruid
, __uid_t __euid
));
639 extern int setreuid
__P ((__uid_t __ruid
, __uid_t __euid
));
643 /* Set the effective user ID of the calling process to UID. */
644 extern int seteuid
__P ((__uid_t __uid
));
645 #endif /* Use BSD. */
647 /* Set the group ID of the calling process to GID.
648 If the calling process is the super-user, set the real
649 and effective group IDs, and the saved set-group-ID to GID;
650 if not, the effective group ID is set to GID. */
651 extern int __setgid
__P ((__gid_t __gid
));
652 extern int setgid
__P ((__gid_t __gid
));
654 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
655 /* Set the real group ID of the calling process to RGID,
656 and the effective group ID of the calling process to EGID. */
657 extern int __setregid
__P ((__gid_t __rgid
, __gid_t __egid
));
658 extern int setregid
__P ((__gid_t __rgid
, __gid_t __egid
));
662 /* Set the effective group ID of the calling process to GID. */
663 extern int setegid
__P ((__gid_t __gid
));
664 #endif /* Use BSD. */
667 /* Clone the calling process, creating an exact copy.
668 Return -1 for errors, 0 to the new process,
669 and the process ID of the new process to the old process. */
670 extern __pid_t __fork
__P ((void));
671 extern __pid_t fork
__P ((void));
673 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
674 /* Clone the calling process, but without copying the whole address space.
675 The the calling process is suspended until the the new process exits or is
676 replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
677 and the process ID of the new process to the old process. */
678 extern __pid_t __vfork
__P ((void));
679 extern __pid_t vfork
__P ((void));
680 #endif /* Use BSD. */
683 /* Return the pathname of the terminal FD is open on, or NULL on errors.
684 The returned storage is good only until the next call to this function. */
685 extern char *ttyname
__P ((int __fd
));
687 /* Store at most BUFLEN characters of the pathname of the terminal FD is
688 open on in BUF. Return 0 on success, otherwise an error number. */
689 extern int __ttyname_r
__P ((int __fd
, char *__buf
, size_t __buflen
));
690 extern int ttyname_r
__P ((int __fd
, char *__buf
, size_t __buflen
));
692 /* Return 1 if FD is a valid descriptor associated
693 with a terminal, zero if not. */
694 extern int __isatty
__P ((int __fd
));
695 extern int isatty
__P ((int __fd
));
697 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
698 /* Return the index into the active-logins file (utmp) for
699 the controlling terminal. */
700 extern int ttyslot
__P ((void));
704 /* Make a link to FROM named TO. */
705 extern int __link
__P ((__const
char *__from
, __const
char *__to
));
706 extern int link
__P ((__const
char *__from
, __const
char *__to
));
708 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
709 /* Make a symbolic link to FROM named TO. */
710 extern int __symlink
__P ((__const
char *__from
, __const
char *__to
));
711 extern int symlink
__P ((__const
char *__from
, __const
char *__to
));
713 /* Read the contents of the symbolic link PATH into no more than
714 LEN bytes of BUF. The contents are not null-terminated.
715 Returns the number of characters read, or -1 for errors. */
716 extern int __readlink
__P ((__const
char *__path
, char *__buf
, size_t __len
));
717 extern int readlink
__P ((__const
char *__path
, char *__buf
, size_t __len
));
718 #endif /* Use BSD. */
720 /* Remove the link NAME. */
721 extern int __unlink
__P ((__const
char *__name
));
722 extern int unlink
__P ((__const
char *__name
));
724 /* Remove the directory PATH. */
725 extern int __rmdir
__P ((__const
char *__path
));
726 extern int rmdir
__P ((__const
char *__path
));
729 /* Return the foreground process group ID of FD. */
730 extern __pid_t tcgetpgrp
__P ((int __fd
));
732 /* Set the foreground process group ID of FD set PGRP_ID. */
733 extern int tcsetpgrp
__P ((int __fd
, __pid_t __pgrp_id
));
736 /* Return the login name of the user. */
737 extern char *getlogin
__P ((void));
738 #ifdef __USE_REENTRANT
739 /* Return at most NAME_LEN characters of the login name of the user in NAME.
740 If it cannot be determined or some other error occurred, return the error
741 code. Otherwise return 0. */
742 extern int getlogin_r
__P ((char *__name
, size_t __name_len
));
746 /* Set the login name returned by `getlogin'. */
747 extern int setlogin
__P ((__const
char *__name
));
752 /* Process the arguments in ARGV (ARGC of them, minus
753 the program name) for options given in OPTS.
755 If `opterr' is zero, no messages are generated
756 for invalid options; it defaults to 1.
757 `optind' is the current index into ARGV.
758 `optarg' is the argument corresponding to the current option.
759 Return the option character from OPTS just read.
760 Return -1 when there are no more options.
761 For unrecognized options, or options missing arguments,
762 `optopt' is set to the option letter, and '?' is returned.
764 The OPTS string is a list of characters which are recognized option
765 letters, optionally followed by colons, specifying that that letter
766 takes an argument, to be placed in `optarg'.
768 If a letter in OPTS is followed by two colons, its argument is optional.
769 This behavior is specific to the GNU `getopt'.
771 The argument `--' causes premature termination of argument scanning,
772 explicitly telling `getopt' that there are no more options.
774 If OPTS begins with `--', then non-option arguments
775 are treated as arguments to the option '\0'.
776 This behavior is specific to the GNU `getopt'. */
777 extern int getopt
__P ((int __argc
, char *__const
* __argv
,
778 __const
char *__opts
));
786 #if defined __USE_BSD || defined __USE_XOPEN
788 /* Put the name of the current host in no more than LEN bytes of NAME.
789 The result is null-terminated if LEN is large enough for the full
790 name and the terminator. */
791 extern int __gethostname
__P ((char *__name
, size_t __len
));
792 extern int gethostname
__P ((char *__name
, size_t __len
));
794 /* Set the name of the current host to NAME, which is LEN bytes long.
795 This call is restricted to the super-user. */
796 extern int sethostname
__P ((__const
char *__name
, size_t __len
));
798 /* Set the current machine's Internet number to ID.
799 This call is restricted to the super-user. */
800 extern int sethostid
__P ((long int __id
));
803 /* Get and set the NIS (aka YP) domain name, if any.
804 Called just like `gethostname' and `sethostname'.
805 The NIS domain name is usually the empty string when not using NIS. */
806 extern int getdomainname
__P ((char *__name
, size_t __len
));
807 extern int setdomainname
__P ((__const
char *__name
, size_t __len
));
810 /* Make all changes done to FD actually appear on disk. */
811 extern int fsync
__P ((int __fd
));
814 /* Revoke access permissions to all processes currently communicating
815 with the control terminal, and then send a SIGHUP signal to the process
816 group of the control terminal. */
817 extern int vhangup
__P ((void));
819 /* Revoke the access of all descriptors currently open on FILE. */
820 extern int revoke
__P ((__const
char *__file
));
823 /* Enable statistical profiling, writing samples of the PC into at most
824 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
825 is enabled, the system examines the user PC and increments
826 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
827 disable profiling. Returns zero on success, -1 on error. */
828 extern int __profil
__P ((unsigned short int *__sample_buffer
, size_t __size
,
829 size_t __offset
, unsigned int __scale
));
830 extern int profil
__P ((unsigned short int *__sample_buffer
, size_t __size
,
831 size_t __offset
, unsigned int __scale
));
834 /* Turn accounting on if NAME is an existing file. The system will then write
835 a record for each process as it terminates, to this file. If NAME is NULL,
836 turn accounting off. This call is restricted to the super-user. */
837 extern int acct
__P ((__const
char *__name
));
839 /* Make PATH be the root directory (the starting point for absolute paths).
840 This call is restricted to the super-user. */
841 extern int chroot
__P ((__const
char *__path
));
844 /* Successive calls return the shells listed in `/etc/shells'. */
845 extern char *getusershell
__P ((void));
846 extern void endusershell
__P ((void)); /* Discard cached info. */
847 extern void setusershell
__P ((void)); /* Rewind and re-read the file. */
850 /* Prompt with PROMPT and read a string from the terminal without echoing.
851 Uses /dev/tty if possible; otherwise stderr and stdin. */
852 extern char *getpass
__P ((__const
char *__prompt
));
854 /* Put the program in the background, and dissociate from the controlling
855 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
856 redirects stdin, stdout, and stderr to /dev/null. */
857 extern int daemon
__P ((int __nochdir
, int __noclose
));
859 #endif /* Use BSD || X/Open. */
862 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
864 /* Return the current machine's Internet number. */
865 extern long int gethostid
__P ((void));
867 /* Make all changes done to all files actually appear on disk. */
868 extern int sync
__P ((void));
871 /* Return the number of bytes in a page. This is the system's page size,
872 which is not necessarily the same as the hardware page size. */
873 extern int __getpagesize
__P ((void));
874 extern int getpagesize
__P ((void));
877 /* Truncate FILE to LENGTH bytes. */
878 #ifndef __USE_FILE_OFFSET64
879 extern int truncate
__P ((__const
char *__file
, __off_t __length
));
881 extern int truncate
__P ((__const
char *__file
, __off64_t __length
))
882 __asm__ ("truncate64");
884 #ifdef __USE_LARGEFILE64
885 extern int truncate64
__P ((__const
char *__file
, __off64_t __length
));
888 /* Truncate the file FD is open on to LENGTH bytes. */
889 #ifndef __USE_FILE_OFFSET64
890 extern int ftruncate
__P ((int __fd
, __off_t __length
));
892 extern int ftruncate
__P ((int __fd
, __off64_t __length
))
893 __asm__ ("ftruncate64");
895 #ifdef __USE_LARGEFILE64
896 extern int ftruncate64
__P ((int __fd
, __off64_t __length
));
900 /* Return the maximum number of file descriptors
901 the current process could possibly have. */
902 extern int __getdtablesize
__P ((void));
903 extern int getdtablesize
__P ((void));
905 #endif /* Use BSD || X/Open Unix. */
908 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
910 /* Set the end of accessible data space (aka "the break") to ADDR.
911 Returns zero on success and -1 for errors (with errno set). */
912 extern int __brk
__P ((__ptr_t __addr
));
913 extern int brk
__P ((__ptr_t __addr
));
915 # define __need_ptrdiff_t
918 /* Increase or decrease the end of accessible data space by DELTA bytes.
919 If successful, returns the address the previous end of data space
920 (i.e. the beginning of the new space, if DELTA > 0);
921 returns (void *) -1 for errors (with errno set). */
922 extern __ptr_t __sbrk
__P ((ptrdiff_t __delta
));
923 extern __ptr_t sbrk
__P ((ptrdiff_t __delta
));
928 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
929 This is completely system-dependent, and not often useful.
931 In Unix, `syscall' sets `errno' for all errors and most calls return -1
932 for errors; in many systems you cannot pass arguments or get return
933 values for all system calls (`pipe', `fork', and `getppid' typically
936 In Mach, all system calls take normal arguments and always return an
937 error code (zero for success). */
938 extern long int syscall
__P ((long int __sysno
, ...));
940 #endif /* Use misc. */
943 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
944 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
945 files consistent. Some systems have them there and some here, and some
946 software depends on the macros being defined without including both. */
948 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
949 LEN is always relative to the current file position.
950 The CMD argument is one of the following. */
952 # define F_ULOCK 0 /* Unlock a previously locked region. */
953 # define F_LOCK 1 /* Lock a region for exclusive use. */
954 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
955 # define F_TEST 3 /* Test a region for other processes locks. */
957 # ifndef __USE_FILE_OFFSET64
958 extern int lockf
__P ((int __fd
, int __cmd
, __off_t __len
));
960 extern int lockf
__P ((int __fd
, int __cmd
, __off64_t __len
))
963 # ifdef __USE_LARGEFILE64
964 extern int lockf64
__P ((int __fd
, int __cmd
, __off64_t __len
));
966 #endif /* Use misc and F_LOCK not already defined. */
971 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
974 # define TEMP_FAILURE_RETRY(expression) \
976 ({ long int __result; \
977 do __result = (long int) (expression); \
978 while (__result == -1L && errno == EINTR); \
982 /* This variable is set nonzero at startup if the process's effective
983 IDs differ from its real IDs, or it is otherwise indicated that
984 extra security should be used. When this is set the dynamic linker
985 and some functions contained in the C library ignore various
986 environment variables that normally affect them. */
987 extern int __libc_enable_secure
;
991 #if defined __USE_POSIX199309 || defined __USE_UNIX98
992 /* Synchronize at least the data part of a file with the underlying
994 extern int fdatasync
__P ((int __fildes
));
995 #endif /* Use POSIX199309 */
998 /* XPG4.2 specifies that prototypes for the encryption functions must
1001 /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
1002 extern char *crypt
__P ((__const
char *__key
, __const
char *__salt
));
1004 /* Setup DES tables according KEY. */
1005 extern void setkey
__P ((__const
char *__key
));
1007 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
1009 extern void encrypt
__P ((char *__block
, int __edflag
));
1012 /* Swab pairs bytes in the first N bytes of the area pointed to by
1013 FROM and copy the result to TO. The value of TO must not be in the
1014 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
1015 is without partner. */
1016 extern void swab
__P ((__const __ptr_t __from
, __ptr_t __to
, ssize_t __n
));
1020 /* The Single Unix specification, version 2, demands these prototypes
1021 to be here. They are also found in <stdio.h>. */
1023 /* Return the name of the controlling terminal. */
1024 extern char *ctermid
__P ((char *__s
));
1026 /* Return the name of the current user. */
1027 extern char *cuserid
__P ((char *__s
));
1032 #endif /* unistd.h */