1 /* Copyright (C) 1991-1999, 2000 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>
28 #include <sys/types.h>
29 #include <asm/unistd.h>
33 /* These may be used to determine what facilities are present at compile time.
34 Their values can be obtained at run time from `sysconf'. */
36 /* POSIX Standard approved as ISO/IEC 9945-1 as of August, 1988 and
37 extended by POSIX-1b (aka POSIX-4) and POSIX-1c (aka POSIX threads). */
38 #define _POSIX_VERSION 199506L
40 /* These are not #ifdef __USE_POSIX2 because they are
41 in the theoretically application-owned namespace. */
43 /* POSIX Standard approved as ISO/IEC 9945-2 as of December, 1993. */
44 #define _POSIX2_C_VERSION 199209L
46 /* The utilities on GNU systems also correspond to this version. */
47 #define _POSIX2_VERSION 199209L
49 /* If defined, the implementation supports the
50 C Language Bindings Option. */
51 #define _POSIX2_C_BIND 1
53 /* If defined, the implementation supports the
54 C Language Development Utilities Option. */
55 #define _POSIX2_C_DEV 1
57 /* If defined, the implementation supports the
58 Software Development Utilities Option. */
59 #define _POSIX2_SW_DEV 1
61 /* If defined, the implementation supports the
62 creation of locales with the localedef utility. */
63 #define _POSIX2_LOCALEDEF 1
65 /* X/Open version number to which the library conforms. It is selectable. */
67 # define _XOPEN_VERSION 500
69 # define _XOPEN_VERSION 4
72 /* Commands and utilities from XPG4 are available. */
73 #define _XOPEN_XCU_VERSION 4
75 /* We are compatible with the old published standards as well. */
80 /* The X/Open Unix extensions are available. */
83 /* Encryption is present. */
84 #define _XOPEN_CRYPT 1
86 /* The enhanced internationalization capabilities according to XPG4.2
88 #define _XOPEN_ENH_I18N 1
90 /* The legacy interfaces are also available. */
91 #define _XOPEN_LEGACY 1
94 /* Get values of POSIX options:
96 If these symbols are defined, the corresponding features are
97 always available. If not, they may be available sometimes.
98 The current values can be obtained with `sysconf'.
100 _POSIX_JOB_CONTROL Job control is supported.
101 _POSIX_SAVED_IDS Processes have a saved set-user-ID
102 and a saved set-group-ID.
103 _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.
104 _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.
105 _POSIX_TIMERS POSIX.4 clocks and timers are supported.
106 _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.
107 _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.
108 _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.
109 _POSIX_FSYNC The fsync function is present.
110 _POSIX_MAPPED_FILES Mapping of files to memory is supported.
111 _POSIX_MEMLOCK Locking of all memory is supported.
112 _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.
113 _POSIX_MEMORY_PROTECTION Setting of memory protections is supported.
114 _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.
115 _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.
116 _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
117 _POSIX_THREADS POSIX.1c pthreads are supported.
118 _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
119 _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
120 _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
121 _POSIX_THREAD_PRIORITY_SCHEDULING
122 POSIX.1c thread execution scheduling supported.
123 _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.
124 _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.
125 _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
126 _POSIX_PII Protocol-independent interfaces are supported.
127 _POSIX_PII_XTI XTI protocol-indep. interfaces are supported.
128 _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.
129 _POSIX_PII_INTERNET Internet family of protocols supported.
130 _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.
131 _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.
132 _POSIX_PII_OSI ISO/OSI family of protocols supported.
133 _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.
134 _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.
135 _POSIX_POLL Implementation supports `poll' function.
136 _POSIX_SELECT Implementation supports `select' and `pselect'.
138 _XOPEN_REALTIME X/Open realtime support is available.
139 _XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
140 _XOPEN_SHM Shared memory interface according to XPG4.2.
142 _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
143 int, long, pointer, and off_t types.
144 _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit
145 int, long, and pointer and off_t with at least
147 _XBS5_LP64_OFF64 Implementation provides environment with 32-bit
148 int, and 64-bit long, pointer, and off_t types.
149 _XBS5_LPBIG_OFFBIG Implementation provides environment with at
150 least 32 bits int and long, pointer, and off_t
151 with at least 64 bits.
153 If any of these symbols is defined as -1, the corresponding option is not
154 true for any file. If any is defined as other than -1, the corresponding
155 option is true for all files. If a symbol is not defined at all, the value
156 for a specific file can be obtained from `pathconf' and `fpathconf'.
158 _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
159 the owner of a file. `chown' can only be used
160 to change the group ID of a file to a group of
161 which the calling process is a member.
162 _POSIX_NO_TRUNC Pathname components longer than
163 NAME_MAX generate an error.
164 _POSIX_VDISABLE If defined, if the value of an element of the
165 `c_cc' member of `struct termios' is
166 _POSIX_VDISABLE, no character will have the
167 effect associated with that element.
168 _POSIX_SYNC_IO Synchronous I/O may be performed.
169 _POSIX_ASYNC_IO Asynchronous I/O may be performed.
170 _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.
172 Support for the Large File Support interface is not generally available.
173 If it is available the following constants are defined to one.
174 _LFS64_LARGEFILE Low-level I/O supports large files.
175 _LFS64_STDIO Standard I/O supports large files.
178 #include <bits/posix_opt.h>
179 /* At this time, we don't do pthreads... Sorry... */
180 #undef _POSIX_THREADS
182 /* Get the environment definitions from Unix98. */
184 # include <bits/environments.h>
187 /* Standard file descriptors. */
188 #define STDIN_FILENO 0 /* Standard input. */
189 #define STDOUT_FILENO 1 /* Standard output. */
190 #define STDERR_FILENO 2 /* Standard error output. */
193 /* All functions that are not declared anywhere else. */
195 #include <bits/types.h>
198 typedef __ssize_t ssize_t;
199 # define ssize_t ssize_t
202 #define __need_size_t
207 /* The Single Unix specification says that some more types are
210 typedef __gid_t gid_t;
215 typedef __uid_t uid_t;
220 # ifndef __USE_FILE_OFFSET64
221 typedef __off_t off_t;
223 typedef __off64_t off_t;
227 # if defined __USE_LARGEFILE64 && !defined off64_t
228 typedef __off64_t off64_t;
229 # define off64_t off64_t
233 typedef __pid_t pid_t;
240 typedef __intptr_t intptr_t;
241 # define intptr_t intptr_t
245 /* Values for the second argument to access.
246 These may be OR'd together. */
247 #define R_OK 4 /* Test for read permission. */
248 #define W_OK 2 /* Test for write permission. */
249 #define X_OK 1 /* Test for execute permission. */
250 #define F_OK 0 /* Test for existence. */
252 /* Test for access to NAME using the real UID and real GID. */
253 extern int access __P ((__const char *__name, int __type));
256 /* Test for access to NAME using the effective UID and GID
257 (as normal file operations use). */
258 extern int euidaccess __P ((__const char *__name, int __type));
262 /* Values for the WHENCE argument to lseek. */
263 #ifndef _STDIO_H /* <stdio.h> has the same definitions. */
264 # define SEEK_SET 0 /* Seek from beginning of file. */
265 # define SEEK_CUR 1 /* Seek from current position. */
266 # define SEEK_END 2 /* Seek from end of file. */
269 #if defined __USE_BSD && !defined L_SET
270 /* Old BSD names for the same constants; just for compatibility. */
271 # define L_SET SEEK_SET
272 # define L_INCR SEEK_CUR
273 # define L_XTND SEEK_END
277 /* Move FD's file position to OFFSET bytes from the
278 beginning of the file (if WHENCE is SEEK_SET),
279 the current position (if WHENCE is SEEK_CUR),
280 or the end of the file (if WHENCE is SEEK_END).
281 Return the new file position. */
282 extern __off_t __lseek __P ((int __fd, __off_t __offset, int __whence));
283 #ifndef __USE_FILE_OFFSET64
284 extern __off_t lseek __P ((int __fd, __off_t __offset, int __whence));
287 extern __off64_t __REDIRECT (lseek,
288 __P ((int __fd, __off64_t __offset,
292 # define lseek lseek64
295 #ifdef __USE_LARGEFILE64
296 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
299 /* Close the file descriptor FD. */
300 extern int __close __P ((int __fd));
301 extern int close __P ((int __fd));
303 /* Read NBYTES into BUF from FD. Return the
304 number read, -1 for errors or 0 for EOF. */
305 extern ssize_t __read __P ((int __fd, __ptr_t __buf, size_t __nbytes));
306 extern ssize_t read __P ((int __fd, __ptr_t __buf, size_t __nbytes));
308 /* Write N bytes of BUF to FD. Return the number written, or -1. */
309 extern ssize_t __write __P ((int __fd, __const __ptr_t __buf, size_t __n));
310 extern ssize_t write __P ((int __fd, __const __ptr_t __buf, size_t __n));
313 /* Read NBYTES into BUF from FD at the given position OFFSET without
314 changing the file pointer. Return the number read, -1 for errors
316 extern ssize_t __pread64 __P ((int __fd, __ptr_t __buf, size_t __nbytes,
317 __off64_t __offset));
318 /* Write N bytes of BUF to FD at the given position OFFSET without
319 changing the file pointer. Return the number written, or -1. */
320 extern ssize_t __pwrite64 __P ((int __fd, __const __ptr_t __buf, size_t __n,
321 __off64_t __offset));
323 # ifndef __USE_FILE_OFFSET64
324 extern ssize_t pread __P ((int __fd, __ptr_t __buf, size_t __nbytes,
326 extern ssize_t pwrite __P ((int __fd, __const __ptr_t __buf, size_t __n,
330 extern ssize_t __REDIRECT (pread, __P ((int __fd, __ptr_t __buf,
331 size_t __nbytes,__off64_t __offset)),
333 extern ssize_t __REDIRECT (pwrite, __P ((int __fd, __const __ptr_t __buf,
334 size_t __nbytes, __off64_t __offset)),
337 # define pread pread64
338 # define pwrite pwrite64
342 # ifdef __USE_LARGEFILE64
343 extern ssize_t pread64 __P ((int __fd, __ptr_t __buf, size_t __nbytes,
344 __off64_t __offset));
345 extern ssize_t pwrite64 __P ((int __fd, __const __ptr_t __buf, size_t __n,
346 __off64_t __offset));
350 /* Create a one-way communication channel (pipe).
351 If successful, two file descriptors are stored in PIPEDES;
352 bytes written on PIPEDES[1] can be read from PIPEDES[0].
353 Returns 0 if successful, -1 if not. */
354 extern int pipe __P ((int __pipedes[2]));
356 /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
357 If SECONDS is zero, any currently scheduled alarm will be cancelled.
358 The function returns the number of seconds remaining until the last
359 alarm scheduled would have signaled, or zero if there wasn't one.
360 There is no return value to indicate an error, but you can set `errno'
361 to 0 and check its value after calling `alarm', and this might tell you.
362 The signal may come late due to processor scheduling. */
363 extern unsigned int alarm __P ((unsigned int __seconds));
365 /* Make the process sleep for SECONDS seconds, or until a signal arrives
366 and is not ignored. The function returns the number of seconds less
367 than SECONDS which it actually slept (thus zero if it slept the full time).
368 If a signal handler does a `longjmp' or modifies the handling of the
369 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
370 signal afterwards is undefined. There is no return value to indicate
371 error, but if `sleep' returns SECONDS, it probably didn't work. */
372 extern unsigned int sleep __P ((unsigned int __seconds));
374 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
375 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
376 microseconds. If INTERVAL is nonzero, when the alarm goes off, the
377 timer is reset to go off every INTERVAL microseconds thereafter.
378 Returns the number of microseconds remaining before the alarm. */
379 extern unsigned int ualarm __P ((unsigned int __value,
380 unsigned int __interval));
382 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
384 extern void usleep __P ((unsigned int __useconds));
388 /* Suspend the process until a signal arrives.
389 This always returns -1 and sets `errno' to EINTR. */
390 extern int pause __P ((void));
393 /* Change the owner and group of FILE. */
394 extern int chown __P ((__const char *__file, __uid_t __owner,
397 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
398 /* Change the owner and group of the file that FD is open on. */
399 extern int fchown __P ((int __fd, __uid_t __owner, __gid_t __group));
402 /* Change owner and group of FILE, if it is a symbolic
403 link the ownership of the symbolic link is changed. */
404 extern int lchown __P ((__const char *__file, __uid_t __owner,
407 #endif /* Use BSD || X/Open Unix. */
409 /* Change the process's working directory to PATH. */
410 extern int chdir __P ((__const char *__path));
412 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
413 /* Change the process's working directory to the one FD is open on. */
414 extern int fchdir __P ((int __fd));
417 /* Get the pathname of the current working directory,
418 and put it in SIZE bytes of BUF. Returns NULL if the
419 directory couldn't be determined or SIZE was too small.
420 If successful, returns BUF. In GNU, if BUF is NULL,
421 an array is allocated with `malloc'; the array is SIZE
422 bytes long, unless SIZE == 0, in which case it is as
424 extern char *getcwd __P ((char *__buf, size_t __size));
427 /* Return a malloc'd string containing the current directory name.
428 If the environment variable `PWD' is set, and its value is correct,
429 that value is used. */
430 extern char *get_current_dir_name __P ((void));
433 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
434 /* Put the absolute pathname of the current working directory in BUF.
435 If successful, return BUF. If not, put an error message in
436 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
437 extern char *getwd __P ((char *__buf));
441 /* Duplicate FD, returning a new file descriptor on the same file. */
442 extern int dup __P ((int __fd));
444 /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
445 extern int dup2 __P ((int __fd, int __fd2));
447 /* NULL-terminated array of "NAME=VALUE" environment variables. */
448 extern char **__environ;
449 extern char **environ;
452 /* Replace the current process, executing PATH with arguments ARGV and
453 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
454 extern int execve __P ((__const char *__path, char *__const __argv[],
455 char *__const __envp[]));
458 /* Execute the file FD refers to, overlaying the running program image.
459 ARGV and ENVP are passed to the new program, as for `execve'. */
460 extern int fexecve __P ((int __fd,
461 char *__const __argv[], char *__const __envp[]));
466 /* Execute PATH with arguments ARGV and environment from `environ'. */
467 extern int execv __P ((__const char *__path, char *__const __argv[]));
469 /* Execute PATH with all arguments after PATH until a NULL pointer,
470 and the argument after that for environment. */
471 extern int execle __P ((__const char *__path, __const char *__arg, ...));
473 /* Execute PATH with all arguments after PATH until
474 a NULL pointer and environment from `environ'. */
475 extern int execl __P ((__const char *__path, __const char *__arg, ...));
477 /* Execute FILE, searching in the `PATH' environment variable if it contains
478 no slashes, with arguments ARGV and environment from `environ'. */
479 extern int execvp __P ((__const char *__file, char *__const __argv[]));
481 /* Execute FILE, searching in the `PATH' environment variable if
482 it contains no slashes, with all arguments after FILE until a
483 NULL pointer and environment from `environ'. */
484 extern int execlp __P ((__const char *__file, __const char *__arg, ...));
487 #if defined __USE_MISC || defined __USE_XOPEN
488 /* Add INC to priority of the current process. */
489 extern int nice __P ((int __inc));
493 /* Terminate program execution with the low-order 8 bits of STATUS. */
494 extern void _exit __PMT ((int __status)) __attribute__ ((__noreturn__));
497 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
498 the `_SC_*' symbols for the NAME argument to `sysconf';
499 and the `_CS_*' symbols for the NAME argument to `confstr'. */
500 #include <bits/confname.h>
502 /* Get file-specific configuration information about PATH. */
503 extern long int pathconf __P ((__const char *__path, int __name));
505 /* Get file-specific configuration about descriptor FD. */
506 extern long int fpathconf __P ((int __fd, int __name));
508 /* Get the value of the system variable NAME. */
509 extern long int sysconf __P ((int __name));
512 /* Get the value of the string-valued system variable NAME. */
513 extern size_t confstr __P ((int __name, char *__buf, size_t __len));
517 /* Get the process ID of the calling process. */
518 extern __pid_t __getpid __P ((void));
519 extern __pid_t getpid __P ((void));
521 /* Get the process ID of the calling process's parent. */
522 extern __pid_t getppid __P ((void));
524 /* Get the process group ID of the calling process.
525 This function is different on old BSD. */
527 extern __pid_t getpgrp __P ((void));
530 extern __pid_t __REDIRECT (getpgrp, __P ((__pid_t __pid)), __getpgid);
532 # define getpgrp __getpgid
536 /* Get the process group ID of process PID. */
537 extern __pid_t __getpgid __P ((__pid_t __pid));
538 #ifdef __USE_XOPEN_EXTENDED
539 extern __pid_t getpgid __P ((__pid_t __pid));
543 /* Set the process group ID of the process matching PID to PGID.
544 If PID is zero, the current process's process group ID is set.
545 If PGID is zero, the process ID of the process is used. */
546 extern int __setpgid __P ((__pid_t __pid, __pid_t __pgid));
547 extern int setpgid __P ((__pid_t __pid, __pid_t __pgid));
549 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
550 /* Both System V and BSD have `setpgrp' functions, but with different
551 calling conventions. The BSD function is the same as POSIX.1 `setpgid'
552 (above). The System V function takes no arguments and puts the calling
553 process in its on group like `setpgid (0, 0)'.
555 New programs should always use `setpgid' instead.
557 The default in GNU is to provide the System V function. The BSD
558 function is available under -D_BSD_SOURCE. */
562 /* Set the process group ID of the calling process to its own PID.
563 This is exactly the same as `setpgid (0, 0)'. */
564 extern int setpgrp __P ((void));
568 /* Another name for `setpgid' (above). */
570 extern int __REDIRECT (setpgrp, __P ((__pid_t __pid, __pid_t __pgrp)),
573 # define setpgrp setpgid
576 # endif /* Favor BSD. */
577 #endif /* Use SVID or BSD. */
579 /* Create a new session with the calling process as its leader.
580 The process group IDs of the session and the calling process
581 are set to the process ID of the calling process, which is returned. */
582 extern __pid_t setsid __P ((void));
584 #ifdef __USE_XOPEN_EXTENDED
585 /* Return the session ID of the given process. */
586 extern __pid_t getsid __P ((__pid_t __pid));
589 /* Get the real user ID of the calling process. */
590 extern __uid_t getuid __P ((void));
592 /* Get the effective user ID of the calling process. */
593 extern __uid_t geteuid __P ((void));
595 /* Get the real group ID of the calling process. */
596 extern __gid_t getgid __P ((void));
598 /* Get the effective group ID of the calling process. */
599 extern __gid_t getegid __P ((void));
601 /* If SIZE is zero, return the number of supplementary groups
602 the calling process is in. Otherwise, fill in the group IDs
603 of its supplementary groups in LIST and return the number written. */
604 extern int getgroups __P ((int __size, __gid_t __list[]));
607 /* Return nonzero iff the calling process is in group GID. */
608 extern int group_member __P ((__gid_t __gid));
611 /* Set the user ID of the calling process to UID.
612 If the calling process is the super-user, set the real
613 and effective user IDs, and the saved set-user-ID to UID;
614 if not, the effective user ID is set to UID. */
615 extern int setuid __P ((__uid_t __uid));
617 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
618 /* Set the real user ID of the calling process to RUID,
619 and the effective user ID of the calling process to EUID. */
620 extern int setreuid __P ((__uid_t __ruid, __uid_t __euid));
624 /* Set the effective user ID of the calling process to UID. */
625 extern int seteuid __P ((__uid_t __uid));
626 #endif /* Use BSD. */
628 /* Set the group ID of the calling process to GID.
629 If the calling process is the super-user, set the real
630 and effective group IDs, and the saved set-group-ID to GID;
631 if not, the effective group ID is set to GID. */
632 extern int setgid __P ((__gid_t __gid));
634 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
635 /* Set the real group ID of the calling process to RGID,
636 and the effective group ID of the calling process to EGID. */
637 extern int setregid __P ((__gid_t __rgid, __gid_t __egid));
641 /* Set the effective group ID of the calling process to GID. */
642 extern int setegid __P ((__gid_t __gid));
643 #endif /* Use BSD. */
646 /* Clone the calling process, creating an exact copy.
647 Return -1 for errors, 0 to the new process,
648 and the process ID of the new process to the old process. */
649 #ifdef __HAS_NO_MMU__
650 #define fork fork_not_available_on_mmuless_systems
652 extern __pid_t fork __P ((void));
655 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
656 /* Clone the calling process, but without copying the whole address space.
657 The calling process is suspended until the new process exits or is
658 replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
659 and the process ID of the new process to the old process. */
660 extern __pid_t vfork __P ((void));
661 #endif /* Use BSD. */
664 /* Return the pathname of the terminal FD is open on, or NULL on errors.
665 The returned storage is good only until the next call to this function. */
666 extern char *ttyname __P ((int __fd));
668 /* Store at most BUFLEN characters of the pathname of the terminal FD is
669 open on in BUF. Return 0 on success, otherwise an error number. */
670 extern int ttyname_r __P ((int __fd, char *__buf, size_t __buflen));
672 /* Return 1 if FD is a valid descriptor associated
673 with a terminal, zero if not. */
674 extern int isatty __P ((int __fd));
676 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
677 /* Return the index into the active-logins file (utmp) for
678 the controlling terminal. */
679 extern int ttyslot __P ((void));
683 /* Make a link to FROM named TO. */
684 extern int link __P ((__const char *__from, __const char *__to));
686 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
687 /* Make a symbolic link to FROM named TO. */
688 extern int symlink __P ((__const char *__from, __const char *__to));
690 /* Read the contents of the symbolic link PATH into no more than
691 LEN bytes of BUF. The contents are not null-terminated.
692 Returns the number of characters read, or -1 for errors. */
693 extern int readlink __P ((__const char *__path, char *__buf, size_t __len));
694 #endif /* Use BSD. */
696 /* Remove the link NAME. */
697 extern int unlink __P ((__const char *__name));
699 /* Remove the directory PATH. */
700 extern int rmdir __P ((__const char *__path));
703 /* Return the foreground process group ID of FD. */
704 extern __pid_t tcgetpgrp __P ((int __fd));
706 /* Set the foreground process group ID of FD set PGRP_ID. */
707 extern int tcsetpgrp __P ((int __fd, __pid_t __pgrp_id));
710 /* Return the login name of the user. */
711 extern char *getlogin __P ((void));
712 #ifdef __USE_REENTRANT
713 /* Return at most NAME_LEN characters of the login name of the user in NAME.
714 If it cannot be determined or some other error occurred, return the error
715 code. Otherwise return 0. */
716 extern int getlogin_r __P ((char *__name, size_t __name_len));
720 /* Set the login name returned by `getlogin'. */
721 extern int setlogin __P ((__const char *__name));
726 /* Get definitions and prototypes for functions to process the
727 arguments in ARGV (ARGC of them, minus the program name) for
728 options given in OPTS. */
729 # define __need_getopt
734 #if defined __USE_BSD || defined __USE_XOPEN
736 /* Put the name of the current host in no more than LEN bytes of NAME.
737 The result is null-terminated if LEN is large enough for the full
738 name and the terminator. */
739 extern int gethostname __P ((char *__name, size_t __len));
741 /* Set the name of the current host to NAME, which is LEN bytes long.
742 This call is restricted to the super-user. */
743 extern int sethostname __P ((__const char *__name, size_t __len));
745 /* Set the current machine's Internet number to ID.
746 This call is restricted to the super-user. */
747 extern int sethostid __P ((long int __id));
750 /* Get and set the NIS (aka YP) domain name, if any.
751 Called just like `gethostname' and `sethostname'.
752 The NIS domain name is usually the empty string when not using NIS. */
753 extern int getdomainname __P ((char *__name, size_t __len));
754 extern int setdomainname __P ((__const char *__name, size_t __len));
757 /* Make all changes done to FD actually appear on disk. */
758 extern int fsync __P ((int __fd));
761 /* Revoke access permissions to all processes currently communicating
762 with the control terminal, and then send a SIGHUP signal to the process
763 group of the control terminal. */
764 extern int vhangup __P ((void));
766 /* Revoke the access of all descriptors currently open on FILE. */
767 extern int revoke __P ((__const char *__file));
770 /* Enable statistical profiling, writing samples of the PC into at most
771 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
772 is enabled, the system examines the user PC and increments
773 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
774 disable profiling. Returns zero on success, -1 on error. */
775 extern int profil __P ((unsigned short int *__sample_buffer, size_t __size,
776 size_t __offset, unsigned int __scale));
779 /* Turn accounting on if NAME is an existing file. The system will then write
780 a record for each process as it terminates, to this file. If NAME is NULL,
781 turn accounting off. This call is restricted to the super-user. */
782 extern int acct __P ((__const char *__name));
784 /* Make PATH be the root directory (the starting point for absolute paths).
785 This call is restricted to the super-user. */
786 extern int chroot __P ((__const char *__path));
789 /* Successive calls return the shells listed in `/etc/shells'. */
790 extern char *getusershell __P ((void));
791 extern void endusershell __P ((void)); /* Discard cached info. */
792 extern void setusershell __P ((void)); /* Rewind and re-read the file. */
795 /* Prompt with PROMPT and read a string from the terminal without echoing.
796 Uses /dev/tty if possible; otherwise stderr and stdin. */
797 extern char *getpass __P ((__const char *__prompt));
799 /* Put the program in the background, and dissociate from the controlling
800 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
801 redirects stdin, stdout, and stderr to /dev/null. */
802 extern int daemon __P ((int __nochdir, int __noclose));
804 #endif /* Use BSD || X/Open. */
807 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
809 /* Return the current machine's Internet number. */
810 extern long int gethostid __P ((void));
812 /* Make all changes done to all files actually appear on disk. */
813 extern int sync __P ((void));
816 /* Return the number of bytes in a page. This is the system's page size,
817 which is not necessarily the same as the hardware page size. */
818 extern int __getpagesize __P ((void)) __attribute__ ((__const__));
819 extern int getpagesize __P ((void)) __attribute__ ((__const__));
822 /* Truncate FILE to LENGTH bytes. */
823 #ifndef __USE_FILE_OFFSET64
824 extern int truncate __P ((__const char *__file, __off_t __length));
827 extern int __REDIRECT (truncate,
828 __P ((__const char *__file, __off64_t __length)),
831 # define truncate truncate64
834 #ifdef __USE_LARGEFILE64
835 extern int truncate64 __P ((__const char *__file, __off64_t __length));
838 /* Truncate the file FD is open on to LENGTH bytes. */
839 extern int __ftruncate __P ((int __fd, __off_t __length));
840 #ifndef __USE_FILE_OFFSET64
841 extern int ftruncate __P ((int __fd, __off_t __length));
844 extern int __REDIRECT (ftruncate, __P ((int __fd, __off64_t __length)),
847 # define ftruncate ftruncate64
850 #ifdef __USE_LARGEFILE64
851 extern int ftruncate64 __P ((int __fd, __off64_t __length));
855 /* Return the maximum number of file descriptors
856 the current process could possibly have. */
857 extern int getdtablesize __P ((void));
859 #endif /* Use BSD || X/Open Unix. */
862 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
864 /* Set the end of accessible data space (aka "the break") to ADDR.
865 Returns zero on success and -1 for errors (with errno set). */
866 extern int brk __P ((__ptr_t __addr));
868 # define __need_ptrdiff_t
871 /* Increase or decrease the end of accessible data space by DELTA bytes.
872 If successful, returns the address the previous end of data space
873 (i.e. the beginning of the new space, if DELTA > 0);
874 returns (void *) -1 for errors (with errno set). */
875 #define ptrdiff_t int
876 extern __ptr_t __sbrk __P ((ptrdiff_t __delta));
877 extern __ptr_t sbrk __P ((ptrdiff_t __delta));
882 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
883 This is completely system-dependent, and not often useful.
885 In Unix, `syscall' sets `errno' for all errors and most calls return -1
886 for errors; in many systems you cannot pass arguments or get return
887 values for all system calls (`pipe', `fork', and `getppid' typically
890 In Mach, all system calls take normal arguments and always return an
891 error code (zero for success). */
892 extern long int syscall __P ((long int __sysno, ...));
894 #endif /* Use misc. */
897 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
898 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
899 files consistent. Some systems have them there and some here, and some
900 software depends on the macros being defined without including both. */
902 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
903 LEN is always relative to the current file position.
904 The CMD argument is one of the following. */
906 # define F_ULOCK 0 /* Unlock a previously locked region. */
907 # define F_LOCK 1 /* Lock a region for exclusive use. */
908 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
909 # define F_TEST 3 /* Test a region for other processes locks. */
911 # ifndef __USE_FILE_OFFSET64
912 extern int lockf __P ((int __fd, int __cmd, __off_t __len));
915 extern int __REDIRECT (lockf, __P ((int __fd, int __cmd, __off64_t __len)),
918 # define lockf lockf64
921 # ifdef __USE_LARGEFILE64
922 extern int lockf64 __P ((int __fd, int __cmd, __off64_t __len));
924 #endif /* Use misc and F_LOCK not already defined. */
929 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
932 # define TEMP_FAILURE_RETRY(expression) \
934 ({ long int __result; \
935 do __result = (long int) (expression); \
936 while (__result == -1L && errno == EINTR); \
940 /* This variable is set nonzero at startup if the process's effective
941 IDs differ from its real IDs, or it is otherwise indicated that
942 extra security should be used. When this is set the dynamic linker
943 and some functions contained in the C library ignore various
944 environment variables that normally affect them. */
945 extern int __libc_enable_secure;
949 #if defined __USE_POSIX199309 || defined __USE_UNIX98
950 /* Synchronize at least the data part of a file with the underlying
952 extern int fdatasync __P ((int __fildes));
953 #endif /* Use POSIX199309 */
956 /* XPG4.2 specifies that prototypes for the encryption functions must
959 /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
960 extern char *crypt __P ((__const char *__key, __const char *__salt));
962 /* Setup DES tables according KEY. */
963 extern void setkey __P ((__const char *__key));
965 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
967 extern void encrypt __P ((char *__block, int __edflag));
970 /* Swab pairs bytes in the first N bytes of the area pointed to by
971 FROM and copy the result to TO. The value of TO must not be in the
972 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
973 is without partner. */
974 extern void swab __P ((__const __ptr_t __from, __ptr_t __to, ssize_t __n));
978 /* The Single Unix specification, version 2, demands these prototypes
979 to be here. They are also found in <stdio.h>. */
981 /* Return the name of the controlling terminal. */
982 extern char *ctermid __P ((char *__s));
984 /* Return the name of the current user. This function should not be
985 used and might go away some time. */
986 extern char *cuserid __P ((char *__s));
988 /* Rename file OLD to NEW. */
989 extern int rename __P ((__const char *__old, __const char *__new));
993 #ifdef __USE_POSIX199309
994 /* This function is only available if the system has POSIX threads. */
996 /* Install handlers to be called when a new process is created with FORK.
997 The PREPARE handler is called in the parent process just before performing
998 FORK. The PARENT handler is called in the parent process just after FORK.
999 The CHILD handler is called in the child process. Each of the three
1000 handlers can be NULL, meaning that no handler needs to be called at that
1002 PTHREAD_ATFORK can be called several times, in which case the PREPARE
1003 handlers are called in LIFO order (last added with PTHREAD_ATFORK,
1004 first called before FORK), and the PARENT and CHILD handlers are called
1005 in FIFO (first added, first called). */
1006 extern int pthread_atfork __P ((void (*__prepare) (void),
1007 void (*__parent) (void),
1008 void (*__child) (void)));
1013 #endif /* unistd.h */