1 /* Copyright (C) 1991,92,93,94,95,96,97,98 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 extern __off64_t __lseek64 __P ((int __fd, __off64_t __offset, int __whence));
274 #ifndef __USE_FILE_OFFSET64
275 extern __off_t lseek __P ((int __fd, __off_t __offset, int __whence));
278 extern __off64_t __REDIRECT (lseek,
279 __P ((int __fd, __off64_t __offset,
283 # define lseek lseek64
286 #ifdef __USE_LARGEFILE64
287 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
290 /* Close the file descriptor FD. */
291 extern int __close __P ((int __fd));
292 extern int close __P ((int __fd));
294 /* Read NBYTES into BUF from FD. Return the
295 number read, -1 for errors or 0 for EOF. */
296 extern ssize_t __read __P ((int __fd, __ptr_t __buf, size_t __nbytes));
297 extern ssize_t read __P ((int __fd, __ptr_t __buf, size_t __nbytes));
299 /* Write N bytes of BUF to FD. Return the number written, or -1. */
300 extern ssize_t __write __P ((int __fd, __const __ptr_t __buf, size_t __n));
301 extern ssize_t write __P ((int __fd, __const __ptr_t __buf, size_t __n));
304 /* Read NBYTES into BUF from FD at the given position OFFSET without
305 changing the file pointer. Return the number read, -1 for errors
307 extern ssize_t __pread __P ((int __fd, __ptr_t __buf, size_t __nbytes,
309 extern ssize_t __pread64 __P ((int __fd, __ptr_t __buf, size_t __nbytes,
310 __off64_t __offset));
311 /* Write N bytes of BUF to FD at the given position OFFSET without
312 changing the file pointer. Return the number written, or -1. */
313 extern ssize_t __pwrite __P ((int __fd, __const __ptr_t __buf, size_t __n,
315 extern ssize_t __pwrite64 __P ((int __fd, __const __ptr_t __buf, size_t __n,
316 __off64_t __offset));
318 # ifndef __USE_FILE_OFFSET64
319 extern ssize_t pread __P ((int __fd, __ptr_t __buf, size_t __nbytes,
321 extern ssize_t pwrite __P ((int __fd, __const __ptr_t __buf, size_t __n,
325 extern ssize_t __REDIRECT (pread, __P ((int __fd, __ptr_t __buf,
326 size_t __nbytes,__off64_t __offset)),
328 extern ssize_t __REDIRECT (pwrite, __P ((int __fd, __const __ptr_t __buf,
329 size_t __nbytes, __off64_t __offset)),
332 # define pread pread64
333 # define pwrite pwrite64
337 # ifdef __USE_LARGEFILE64
338 extern ssize_t pread64 __P ((int __fd, __ptr_t __buf, size_t __nbytes,
339 __off64_t __offset));
340 extern ssize_t pwrite64 __P ((int __fd, __const __ptr_t __buf, size_t __n,
341 __off64_t __offset));
345 /* Create a one-way communication channel (pipe).
346 If successful, two file descriptors are stored in PIPEDES;
347 bytes written on PIPEDES[1] can be read from PIPEDES[0].
348 Returns 0 if successful, -1 if not. */
349 extern int __pipe __P ((int __pipedes[2]));
350 extern int pipe __P ((int __pipedes[2]));
352 /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
353 If SECONDS is zero, any currently scheduled alarm will be cancelled.
354 The function returns the number of seconds remaining until the last
355 alarm scheduled would have signaled, or zero if there wasn't one.
356 There is no return value to indicate an error, but you can set `errno'
357 to 0 and check its value after calling `alarm', and this might tell you.
358 The signal may come late due to processor scheduling. */
359 extern unsigned int alarm __P ((unsigned int __seconds));
361 /* Make the process sleep for SECONDS seconds, or until a signal arrives
362 and is not ignored. The function returns the number of seconds less
363 than SECONDS which it actually slept (thus zero if it slept the full time).
364 If a signal handler does a `longjmp' or modifies the handling of the
365 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
366 signal afterwards is undefined. There is no return value to indicate
367 error, but if `sleep' returns SECONDS, it probably didn't work. */
368 extern unsigned int __sleep __P ((unsigned int __seconds));
369 extern unsigned int sleep __P ((unsigned int __seconds));
371 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
372 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
373 microseconds. If INTERVAL is nonzero, when the alarm goes off, the
374 timer is reset to go off every INTERVAL microseconds thereafter.
375 Returns the number of microseconds remaining before the alarm. */
376 extern unsigned int ualarm __P ((unsigned int __value,
377 unsigned int __interval));
379 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
381 extern void usleep __P ((unsigned int __useconds));
385 /* Suspend the process until a signal arrives.
386 This always returns -1 and sets `errno' to EINTR. */
387 extern int pause __P ((void));
390 /* Change the owner and group of FILE. */
391 extern int __chown __P ((__const char *__file,
392 __uid_t __owner, __gid_t __group));
393 extern int chown __P ((__const char *__file,
394 __uid_t __owner, __gid_t __group));
396 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
397 /* Change the owner and group of the file that FD is open on. */
398 extern int __fchown __P ((int __fd,
399 __uid_t __owner, __gid_t __group));
400 extern int fchown __P ((int __fd,
401 __uid_t __owner, __gid_t __group));
404 /* Change owner and group of FILE, if it is a symbolic
405 link the ownership of the symbolic link is changed. */
406 extern int __lchown __P ((__const char *__file, __uid_t __owner,
408 extern int lchown __P ((__const char *__file, __uid_t __owner,
411 #endif /* Use BSD || X/Open Unix. */
413 /* Change the process's working directory to PATH. */
414 extern int __chdir __P ((__const char *__path));
415 extern int chdir __P ((__const char *__path));
417 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
418 /* Change the process's working directory to the one FD is open on. */
419 extern int __fchdir __P ((int __fd));
420 extern int fchdir __P ((int __fd));
423 /* Get the pathname of the current working directory,
424 and put it in SIZE bytes of BUF. Returns NULL if the
425 directory couldn't be determined or SIZE was too small.
426 If successful, returns BUF. In GNU, if BUF is NULL,
427 an array is allocated with `malloc'; the array is SIZE
428 bytes long, unless SIZE == 0, in which case it is as
430 extern char *__getcwd __P ((char *__buf, size_t __size));
431 extern char *getcwd __P ((char *__buf, size_t __size));
434 /* Return a malloc'd string containing the current directory name.
435 If the environment variable `PWD' is set, and its value is correct,
436 that value is used. */
437 extern char *get_current_dir_name __P ((void));
439 /* Get the canonical absolute name of the named directory, and put it in SIZE
440 bytes of BUF. Returns NULL if the directory couldn't be determined or
441 SIZE was too small. If successful, returns BUF. In GNU, if BUF is
442 NULL, an array is allocated with `malloc'; the array is SIZE bytes long,
443 unless SIZE <= 0, in which case it is as big as necessary. */
445 char *__canonicalize_directory_name_internal __P ((__const char *__thisdir,
450 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
451 /* Put the absolute pathname of the current working directory in BUF.
452 If successful, return BUF. If not, put an error message in
453 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
454 extern char *getwd __P ((char *__buf));
458 /* Duplicate FD, returning a new file descriptor on the same file. */
459 extern int __dup __P ((int __fd));
460 extern int dup __P ((int __fd));
462 /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
463 extern int __dup2 __P ((int __fd, int __fd2));
464 extern int dup2 __P ((int __fd, int __fd2));
466 /* NULL-terminated array of "NAME=VALUE" environment variables. */
467 extern char **__environ;
469 extern char **environ;
473 /* Replace the current process, executing PATH with arguments ARGV and
474 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
475 extern int __execve __P ((__const char *__path, char *__const __argv[],
476 char *__const __envp[]));
477 extern int execve __P ((__const char *__path, char *__const __argv[],
478 char *__const __envp[]));
481 /* Execute the file FD refers to, overlaying the running program image.
482 ARGV and ENVP are passed to the new program, as for `execve'. */
483 extern int fexecve __P ((int __fd,
484 char *__const __argv[], char *__const __envp[]));
489 /* Execute PATH with arguments ARGV and environment from `environ'. */
490 extern int execv __P ((__const char *__path, char *__const __argv[]));
492 /* Execute PATH with all arguments after PATH until a NULL pointer,
493 and the argument after that for environment. */
494 extern int execle __P ((__const char *__path, __const char *__arg, ...));
496 /* Execute PATH with all arguments after PATH until
497 a NULL pointer and environment from `environ'. */
498 extern int execl __P ((__const char *__path, __const char *__arg, ...));
500 /* Execute FILE, searching in the `PATH' environment variable if it contains
501 no slashes, with arguments ARGV and environment from `environ'. */
502 extern int execvp __P ((__const char *__file, char *__const __argv[]));
504 /* Execute FILE, searching in the `PATH' environment variable if
505 it contains no slashes, with all arguments after FILE until a
506 NULL pointer and environment from `environ'. */
507 extern int execlp __P ((__const char *__file, __const char *__arg, ...));
510 #if defined __USE_MISC || defined __USE_XOPEN
511 /* Add INC to priority of the current process. */
512 extern int nice __P ((int __inc));
516 /* Terminate program execution with the low-order 8 bits of STATUS. */
517 extern void _exit __P ((int __status)) __attribute__ ((__noreturn__));
520 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
521 the `_SC_*' symbols for the NAME argument to `sysconf';
522 and the `_CS_*' symbols for the NAME argument to `confstr'. */
523 #include <bits/confname.h>
525 /* Get file-specific configuration information about PATH. */
526 extern long int __pathconf __P ((__const char *__path, int __name));
527 extern long int pathconf __P ((__const char *__path, int __name));
529 /* Get file-specific configuration about descriptor FD. */
530 extern long int __fpathconf __P ((int __fd, int __name));
531 extern long int fpathconf __P ((int __fd, int __name));
533 /* Get the value of the system variable NAME. */
534 extern long int __sysconf __P ((int __name));
535 extern long int sysconf __P ((int __name));
538 /* Get the value of the string-valued system variable NAME. */
539 extern size_t confstr __P ((int __name, char *__buf, size_t __len));
543 /* Get the process ID of the calling process. */
544 extern __pid_t __getpid __P ((void));
545 extern __pid_t getpid __P ((void));
547 /* Get the process ID of the calling process's parent. */
548 extern __pid_t __getppid __P ((void));
549 extern __pid_t getppid __P ((void));
551 /* Get the process group ID of the calling process.
552 This function is different on old BSD. */
554 extern __pid_t getpgrp __P ((void));
557 extern __pid_t __REDIRECT (getpgrp, __P ((__pid_t __pid)), __getpgid);
559 # define getpgrp __getpgid
563 /* Get the process group ID of process PID. */
564 extern __pid_t __getpgid __P ((__pid_t __pid));
565 #ifdef __USE_XOPEN_EXTENDED
566 extern __pid_t getpgid __P ((__pid_t __pid));
570 /* Set the process group ID of the process matching PID to PGID.
571 If PID is zero, the current process's process group ID is set.
572 If PGID is zero, the process ID of the process is used. */
573 extern int __setpgid __P ((__pid_t __pid, __pid_t __pgid));
574 extern int setpgid __P ((__pid_t __pid, __pid_t __pgid));
576 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
577 /* Both System V and BSD have `setpgrp' functions, but with different
578 calling conventions. The BSD function is the same as POSIX.1 `setpgid'
579 (above). The System V function takes no arguments and puts the calling
580 process in its on group like `setpgid (0, 0)'.
582 New programs should always use `setpgid' instead.
584 The default in GNU is to provide the System V function. The BSD
585 function is available under -D_BSD_SOURCE. */
589 /* Set the process group ID of the calling process to its own PID.
590 This is exactly the same as `setpgid (0, 0)'. */
591 extern int setpgrp __P ((void));
595 /* Another name for `setpgid' (above). */
597 extern int __REDIRECT (setpgrp, __P ((__pid_t __pid, __pid_t __pgrp)),
600 # define setpgrp setpgid
603 # endif /* Favor BSD. */
604 #endif /* Use SVID or BSD. */
606 /* Create a new session with the calling process as its leader.
607 The process group IDs of the session and the calling process
608 are set to the process ID of the calling process, which is returned. */
609 extern __pid_t __setsid __P ((void));
610 extern __pid_t setsid __P ((void));
612 #ifdef __USE_XOPEN_EXTENDED
613 /* Return the session ID of the given process. */
614 extern __pid_t getsid __P ((__pid_t __pid));
617 /* Get the real user ID of the calling process. */
618 extern __uid_t __getuid __P ((void));
619 extern __uid_t getuid __P ((void));
621 /* Get the effective user ID of the calling process. */
622 extern __uid_t __geteuid __P ((void));
623 extern __uid_t geteuid __P ((void));
625 /* Get the real group ID of the calling process. */
626 extern __gid_t __getgid __P ((void));
627 extern __gid_t getgid __P ((void));
629 /* Get the effective group ID of the calling process. */
630 extern __gid_t __getegid __P ((void));
631 extern __gid_t getegid __P ((void));
633 /* If SIZE is zero, return the number of supplementary groups
634 the calling process is in. Otherwise, fill in the group IDs
635 of its supplementary groups in LIST and return the number written. */
636 extern int __getgroups __P ((int __size, __gid_t __list[]));
637 extern int getgroups __P ((int __size, __gid_t __list[]));
640 /* Return nonzero iff the calling process is in group GID. */
641 extern int __group_member __P ((__gid_t __gid));
642 extern int group_member __P ((__gid_t __gid));
645 /* Set the user ID of the calling process to UID.
646 If the calling process is the super-user, set the real
647 and effective user IDs, and the saved set-user-ID to UID;
648 if not, the effective user ID is set to UID. */
649 extern int __setuid __P ((__uid_t __uid));
650 extern int setuid __P ((__uid_t __uid));
652 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
653 /* Set the real user ID of the calling process to RUID,
654 and the effective user ID of the calling process to EUID. */
655 extern int __setreuid __P ((__uid_t __ruid, __uid_t __euid));
656 extern int setreuid __P ((__uid_t __ruid, __uid_t __euid));
660 /* Set the effective user ID of the calling process to UID. */
661 extern int seteuid __P ((__uid_t __uid));
662 #endif /* Use BSD. */
664 /* Set the group ID of the calling process to GID.
665 If the calling process is the super-user, set the real
666 and effective group IDs, and the saved set-group-ID to GID;
667 if not, the effective group ID is set to GID. */
668 extern int __setgid __P ((__gid_t __gid));
669 extern int setgid __P ((__gid_t __gid));
671 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
672 /* Set the real group ID of the calling process to RGID,
673 and the effective group ID of the calling process to EGID. */
674 extern int __setregid __P ((__gid_t __rgid, __gid_t __egid));
675 extern int setregid __P ((__gid_t __rgid, __gid_t __egid));
679 /* Set the effective group ID of the calling process to GID. */
680 extern int setegid __P ((__gid_t __gid));
681 #endif /* Use BSD. */
684 /* Clone the calling process, creating an exact copy.
685 Return -1 for errors, 0 to the new process,
686 and the process ID of the new process to the old process. */
687 extern __pid_t __fork __P ((void));
688 extern __pid_t fork __P ((void));
690 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
691 /* Clone the calling process, but without copying the whole address space.
692 The the calling process is suspended until the the new process exits or is
693 replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
694 and the process ID of the new process to the old process. */
695 extern __pid_t __vfork __P ((void));
696 extern __pid_t vfork __P ((void));
697 #endif /* Use BSD. */
700 /* Return the pathname of the terminal FD is open on, or NULL on errors.
701 The returned storage is good only until the next call to this function. */
702 extern char *ttyname __P ((int __fd));
704 /* Store at most BUFLEN characters of the pathname of the terminal FD is
705 open on in BUF. Return 0 on success, otherwise an error number. */
706 extern int __ttyname_r __P ((int __fd, char *__buf, size_t __buflen));
707 extern int ttyname_r __P ((int __fd, char *__buf, size_t __buflen));
709 /* Return 1 if FD is a valid descriptor associated
710 with a terminal, zero if not. */
711 extern int __isatty __P ((int __fd));
712 extern int isatty __P ((int __fd));
714 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
715 /* Return the index into the active-logins file (utmp) for
716 the controlling terminal. */
717 extern int ttyslot __P ((void));
721 /* Make a link to FROM named TO. */
722 extern int __link __P ((__const char *__from, __const char *__to));
723 extern int link __P ((__const char *__from, __const char *__to));
725 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
726 /* Make a symbolic link to FROM named TO. */
727 extern int __symlink __P ((__const char *__from, __const char *__to));
728 extern int symlink __P ((__const char *__from, __const char *__to));
730 /* Read the contents of the symbolic link PATH into no more than
731 LEN bytes of BUF. The contents are not null-terminated.
732 Returns the number of characters read, or -1 for errors. */
733 extern int __readlink __P ((__const char *__path, char *__buf, size_t __len));
734 extern int readlink __P ((__const char *__path, char *__buf, size_t __len));
735 #endif /* Use BSD. */
737 /* Remove the link NAME. */
738 extern int __unlink __P ((__const char *__name));
739 extern int unlink __P ((__const char *__name));
741 /* Remove the directory PATH. */
742 extern int __rmdir __P ((__const char *__path));
743 extern int rmdir __P ((__const char *__path));
746 /* Return the foreground process group ID of FD. */
747 extern __pid_t tcgetpgrp __P ((int __fd));
749 /* Set the foreground process group ID of FD set PGRP_ID. */
750 extern int tcsetpgrp __P ((int __fd, __pid_t __pgrp_id));
753 /* Return the login name of the user. */
754 extern char *getlogin __P ((void));
755 #ifdef __USE_REENTRANT
756 /* Return at most NAME_LEN characters of the login name of the user in NAME.
757 If it cannot be determined or some other error occurred, return the error
758 code. Otherwise return 0. */
759 extern int getlogin_r __P ((char *__name, size_t __name_len));
763 /* Set the login name returned by `getlogin'. */
764 extern int setlogin __P ((__const char *__name));
769 /* Process the arguments in ARGV (ARGC of them, minus
770 the program name) for options given in OPTS.
772 If `opterr' is zero, no messages are generated
773 for invalid options; it defaults to 1.
774 `optind' is the current index into ARGV.
775 `optarg' is the argument corresponding to the current option.
776 Return the option character from OPTS just read.
777 Return -1 when there are no more options.
778 For unrecognized options, or options missing arguments,
779 `optopt' is set to the option letter, and '?' is returned.
781 The OPTS string is a list of characters which are recognized option
782 letters, optionally followed by colons, specifying that that letter
783 takes an argument, to be placed in `optarg'.
785 If a letter in OPTS is followed by two colons, its argument is optional.
786 This behavior is specific to the GNU `getopt'.
788 The argument `--' causes premature termination of argument scanning,
789 explicitly telling `getopt' that there are no more options.
791 If OPTS begins with `--', then non-option arguments
792 are treated as arguments to the option '\0'.
793 This behavior is specific to the GNU `getopt'. */
794 extern int getopt __P ((int __argc, char *__const * __argv,
795 __const char *__opts));
803 #if defined __USE_BSD || defined __USE_XOPEN
805 /* Put the name of the current host in no more than LEN bytes of NAME.
806 The result is null-terminated if LEN is large enough for the full
807 name and the terminator. */
808 extern int __gethostname __P ((char *__name, size_t __len));
809 extern int gethostname __P ((char *__name, size_t __len));
811 /* Set the name of the current host to NAME, which is LEN bytes long.
812 This call is restricted to the super-user. */
813 extern int sethostname __P ((__const char *__name, size_t __len));
815 /* Set the current machine's Internet number to ID.
816 This call is restricted to the super-user. */
817 extern int sethostid __P ((long int __id));
820 /* Get and set the NIS (aka YP) domain name, if any.
821 Called just like `gethostname' and `sethostname'.
822 The NIS domain name is usually the empty string when not using NIS. */
823 extern int getdomainname __P ((char *__name, size_t __len));
824 extern int setdomainname __P ((__const char *__name, size_t __len));
827 /* Make all changes done to FD actually appear on disk. */
828 extern int fsync __P ((int __fd));
831 /* Revoke access permissions to all processes currently communicating
832 with the control terminal, and then send a SIGHUP signal to the process
833 group of the control terminal. */
834 extern int vhangup __P ((void));
836 /* Revoke the access of all descriptors currently open on FILE. */
837 extern int revoke __P ((__const char *__file));
840 /* Enable statistical profiling, writing samples of the PC into at most
841 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
842 is enabled, the system examines the user PC and increments
843 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
844 disable profiling. Returns zero on success, -1 on error. */
845 extern int __profil __P ((unsigned short int *__sample_buffer, size_t __size,
846 size_t __offset, unsigned int __scale));
847 extern int profil __P ((unsigned short int *__sample_buffer, size_t __size,
848 size_t __offset, unsigned int __scale));
851 /* Turn accounting on if NAME is an existing file. The system will then write
852 a record for each process as it terminates, to this file. If NAME is NULL,
853 turn accounting off. This call is restricted to the super-user. */
854 extern int acct __P ((__const char *__name));
856 /* Make PATH be the root directory (the starting point for absolute paths).
857 This call is restricted to the super-user. */
858 extern int chroot __P ((__const char *__path));
861 /* Successive calls return the shells listed in `/etc/shells'. */
862 extern char *getusershell __P ((void));
863 extern void endusershell __P ((void)); /* Discard cached info. */
864 extern void setusershell __P ((void)); /* Rewind and re-read the file. */
867 /* Prompt with PROMPT and read a string from the terminal without echoing.
868 Uses /dev/tty if possible; otherwise stderr and stdin. */
869 extern char *getpass __P ((__const char *__prompt));
871 /* Put the program in the background, and dissociate from the controlling
872 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
873 redirects stdin, stdout, and stderr to /dev/null. */
874 extern int daemon __P ((int __nochdir, int __noclose));
876 #endif /* Use BSD || X/Open. */
879 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
881 /* Return the current machine's Internet number. */
882 extern long int gethostid __P ((void));
884 /* Make all changes done to all files actually appear on disk. */
885 extern int sync __P ((void));
888 /* Return the number of bytes in a page. This is the system's page size,
889 which is not necessarily the same as the hardware page size. */
890 extern int __getpagesize __P ((void));
891 extern int getpagesize __P ((void));
894 /* Truncate FILE to LENGTH bytes. */
895 #ifndef __USE_FILE_OFFSET64
896 extern int truncate __P ((__const char *__file, __off_t __length));
899 extern int __REDIRECT (truncate,
900 __P ((__const char *__file, __off64_t __length)),
903 # define truncate truncate64
906 #ifdef __USE_LARGEFILE64
907 extern int truncate64 __P ((__const char *__file, __off64_t __length));
910 /* Truncate the file FD is open on to LENGTH bytes. */
911 extern int __ftruncate __P ((int __fd, __off_t __length));
912 #ifndef __USE_FILE_OFFSET64
913 extern int ftruncate __P ((int __fd, __off_t __length));
916 extern int __REDIRECT (ftruncate, __P ((int __fd, __off64_t __length)),
919 # define ftruncate ftruncate64
922 #ifdef __USE_LARGEFILE64
923 extern int ftruncate64 __P ((int __fd, __off64_t __length));
927 /* Return the maximum number of file descriptors
928 the current process could possibly have. */
929 extern int __getdtablesize __P ((void));
930 extern int getdtablesize __P ((void));
932 #endif /* Use BSD || X/Open Unix. */
935 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
937 /* Set the end of accessible data space (aka "the break") to ADDR.
938 Returns zero on success and -1 for errors (with errno set). */
939 extern int __brk __P ((__ptr_t __addr));
940 extern int brk __P ((__ptr_t __addr));
942 # define __need_ptrdiff_t
945 /* Increase or decrease the end of accessible data space by DELTA bytes.
946 If successful, returns the address the previous end of data space
947 (i.e. the beginning of the new space, if DELTA > 0);
948 returns (void *) -1 for errors (with errno set). */
949 extern __ptr_t __sbrk __P ((ptrdiff_t __delta));
950 extern __ptr_t sbrk __P ((ptrdiff_t __delta));
955 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
956 This is completely system-dependent, and not often useful.
958 In Unix, `syscall' sets `errno' for all errors and most calls return -1
959 for errors; in many systems you cannot pass arguments or get return
960 values for all system calls (`pipe', `fork', and `getppid' typically
963 In Mach, all system calls take normal arguments and always return an
964 error code (zero for success). */
965 extern long int syscall __P ((long int __sysno, ...));
967 #endif /* Use misc. */
970 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
971 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
972 files consistent. Some systems have them there and some here, and some
973 software depends on the macros being defined without including both. */
975 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
976 LEN is always relative to the current file position.
977 The CMD argument is one of the following. */
979 # define F_ULOCK 0 /* Unlock a previously locked region. */
980 # define F_LOCK 1 /* Lock a region for exclusive use. */
981 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
982 # define F_TEST 3 /* Test a region for other processes locks. */
984 # ifndef __USE_FILE_OFFSET64
985 extern int lockf __P ((int __fd, int __cmd, __off_t __len));
988 extern int __REDIRECT (lockf, __P ((int __fd, int __cmd, __off64_t __len)),
991 # define lockf lockf64
994 # ifdef __USE_LARGEFILE64
995 extern int lockf64 __P ((int __fd, int __cmd, __off64_t __len));
997 #endif /* Use misc and F_LOCK not already defined. */
1002 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
1005 # define TEMP_FAILURE_RETRY(expression) \
1007 ({ long int __result; \
1008 do __result = (long int) (expression); \
1009 while (__result == -1L && errno == EINTR); \
1013 /* This variable is set nonzero at startup if the process's effective
1014 IDs differ from its real IDs, or it is otherwise indicated that
1015 extra security should be used. When this is set the dynamic linker
1016 and some functions contained in the C library ignore various
1017 environment variables that normally affect them. */
1018 extern int __libc_enable_secure;
1022 #if defined __USE_POSIX199309 || defined __USE_UNIX98
1023 /* Synchronize at least the data part of a file with the underlying
1025 extern int fdatasync __P ((int __fildes));
1026 #endif /* Use POSIX199309 */
1029 /* XPG4.2 specifies that prototypes for the encryption functions must
1032 /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
1033 extern char *crypt __P ((__const char *__key, __const char *__salt));
1035 /* Setup DES tables according KEY. */
1036 extern void setkey __P ((__const char *__key));
1038 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
1040 extern void encrypt __P ((char *__block, int __edflag));
1043 /* Swab pairs bytes in the first N bytes of the area pointed to by
1044 FROM and copy the result to TO. The value of TO must not be in the
1045 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
1046 is without partner. */
1047 extern void swab __P ((__const __ptr_t __from, __ptr_t __to, ssize_t __n));
1051 /* The Single Unix specification, version 2, demands these prototypes
1052 to be here. They are also found in <stdio.h>. */
1054 /* Return the name of the controlling terminal. */
1055 extern char *ctermid __P ((char *__s));
1057 /* Return the name of the current user. */
1058 extern char *cuserid __P ((char *__s));
1063 #endif /* unistd.h */