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52e9a9d1 | 1 | /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc. |
28f540f4 RM |
2 | This file is part of the GNU C Library. |
3 | ||
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. | |
8 | ||
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. | |
13 | ||
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 | |
16 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
17 | Cambridge, MA 02139, USA. */ | |
18 | ||
19 | /* | |
20 | * POSIX Standard: 2.10 Symbolic Constants <unistd.h> | |
21 | */ | |
22 | ||
23 | #ifndef _UNISTD_H | |
24 | ||
25 | #define _UNISTD_H 1 | |
26 | #include <features.h> | |
27 | ||
28 | __BEGIN_DECLS | |
29 | ||
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. */ | |
32 | ||
75cd5204 RM |
33 | /* POSIX Standard approved as IEEE Std 1003.1 as of August, 1988 and |
34 | extended by P1003.1b (aka POSIX.4). */ | |
35 | #define _POSIX_VERSION 199309L | |
28f540f4 RM |
36 | |
37 | /* These are not #ifdef __USE_POSIX2 because they are | |
38 | in the theoretically application-owned namespace. */ | |
39 | ||
40 | #define _POSIX2_C_VERSION 199912L /* Invalid until 1003.2 is done. */ | |
41 | ||
42 | /* If defined, the implementation supports the | |
43 | C Language Bindings Option. */ | |
44 | #define _POSIX2_C_BIND 1 | |
45 | ||
46 | /* If defined, the implementation supports the | |
47 | C Language Development Utilities Option. */ | |
48 | #define _POSIX2_C_DEV 1 | |
49 | ||
50 | /* If defined, the implementation supports the | |
51 | Software Development Utilities Option. */ | |
52 | #define _POSIX2_SW_DEV 1 | |
53 | ||
19bc17a9 RM |
54 | /* If defined, the implementation supports the |
55 | creation of locales with the localedef utility. */ | |
56 | #define _POSIX2_LOCALEDEF 1 | |
57 | ||
28f540f4 RM |
58 | |
59 | /* Get values of POSIX options: | |
60 | ||
61 | If these symbols are defined, the corresponding features are | |
62 | always available. If not, they may be available sometimes. | |
63 | The current values can be obtained with `sysconf'. | |
64 | ||
7b3547eb RM |
65 | _POSIX_JOB_CONTROL Job control is supported. |
66 | _POSIX_SAVED_IDS Processes have a saved set-user-ID | |
67 | and a saved set-group-ID. | |
68 | _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. | |
69 | _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. | |
70 | _POSIX_TIMERS POSIX.4 clocks and timers are supported. | |
71 | _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. | |
72 | _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. | |
73 | _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. | |
74 | _POSIX_FSYNC The fsync function is present. | |
75 | _POSIX_MAPPED_FILES Mapping of files to memory is supported. | |
76 | _POSIX_MEMLOCK Locking of all memory is supported. | |
77 | _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. | |
78 | _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. | |
79 | _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. | |
80 | _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. | |
81 | _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. | |
503054c0 RM |
82 | _POSIX_PII Protocol-independent interfaces are supported. |
83 | _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. | |
84 | _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. | |
85 | _POSIX_PII_INTERNET Internet family of protocols supported. | |
86 | _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. | |
87 | _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. | |
88 | _POSIX_PII_OSI ISO/OSI family of protocols supported. | |
89 | _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. | |
90 | _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. | |
91 | _POSIX_POLL Implementation supports `poll' function. | |
92 | _POSIX_SELECT Implementation supports `select' and `pselect'. | |
28f540f4 RM |
93 | |
94 | If any of these symbols is defined as -1, the corresponding option is not | |
95 | true for any file. If any is defined as other than -1, the corresponding | |
96 | option is true for all files. If a symbol is not defined at all, the value | |
97 | for a specific file can be obtained from `pathconf' and `fpathconf'. | |
98 | ||
99 | _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change | |
100 | the owner of a file. `chown' can only be used | |
101 | to change the group ID of a file to a group of | |
102 | which the calling process is a member. | |
103 | _POSIX_NO_TRUNC Pathname components longer than | |
104 | NAME_MAX generate an error. | |
105 | _POSIX_VDISABLE If defined, if the value of an element of the | |
106 | `c_cc' member of `struct termios' is | |
107 | _POSIX_VDISABLE, no character will have the | |
108 | effect associated with that element. | |
75cd5204 RM |
109 | _POSIX_SYNC_IO Synchronous I/O may be performed. |
110 | _POSIX_ASYNC_IO Asynchronous I/O may be performed. | |
111 | _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. | |
28f540f4 RM |
112 | */ |
113 | ||
114 | #include <posix_opt.h> | |
115 | ||
116 | ||
117 | /* Standard file descriptors. */ | |
118 | #define STDIN_FILENO 0 /* Standard input. */ | |
119 | #define STDOUT_FILENO 1 /* Standard output. */ | |
120 | #define STDERR_FILENO 2 /* Standard error output. */ | |
121 | ||
122 | ||
123 | /* All functions that are not declared anywhere else. */ | |
124 | ||
125 | #include <gnu/types.h> | |
126 | ||
127 | #ifndef ssize_t | |
128 | #define ssize_t __ssize_t | |
129 | #endif | |
130 | ||
131 | #define __need_size_t | |
132 | #define __need_NULL | |
133 | #include <stddef.h> | |
134 | ||
135 | ||
136 | /* Values for the second argument to access. | |
137 | These may be OR'd together. */ | |
138 | #define R_OK 4 /* Test for read permission. */ | |
139 | #define W_OK 2 /* Test for write permission. */ | |
140 | #define X_OK 1 /* Test for execute permission. */ | |
141 | #define F_OK 0 /* Test for existence. */ | |
142 | ||
22a1292a | 143 | /* Test for access to NAME using the real UID and real GID. */ |
28f540f4 RM |
144 | extern int __access __P ((__const char *__name, int __type)); |
145 | extern int access __P ((__const char *__name, int __type)); | |
146 | ||
22a1292a RM |
147 | #ifdef __USE_GNU |
148 | /* Test for access to NAME using the effective UID and GID | |
149 | (as normal file operations use). */ | |
150 | extern int euidaccess __P ((__const char *__name, int __type)); | |
151 | #endif | |
152 | ||
28f540f4 RM |
153 | |
154 | /* Values for the WHENCE argument to lseek. */ | |
155 | #ifndef _STDIO_H /* <stdio.h> has the same definitions. */ | |
156 | #define SEEK_SET 0 /* Seek from beginning of file. */ | |
157 | #define SEEK_CUR 1 /* Seek from current position. */ | |
158 | #define SEEK_END 2 /* Seek from end of file. */ | |
159 | #endif | |
160 | ||
1474b80f RM |
161 | #if defined (__USE_BSD) && !defined (L_SET) |
162 | /* Old BSD names for the same constants; just for compatibility. */ | |
163 | #define L_SET SEEK_SET | |
164 | #define L_INCR SEEK_CUR | |
165 | #define L_XTND SEEK_END | |
166 | #endif | |
167 | ||
168 | ||
28f540f4 RM |
169 | /* Move FD's file position to OFFSET bytes from the |
170 | beginning of the file (if WHENCE is SEEK_SET), | |
171 | the current position (if WHENCE is SEEK_CUR), | |
172 | or the end of the file (if WHENCE is SEEK_END). | |
173 | Return the new file position. */ | |
174 | extern __off_t __lseek __P ((int __fd, __off_t __offset, int __whence)); | |
175 | extern __off_t lseek __P ((int __fd, __off_t __offset, int __whence)); | |
176 | ||
177 | /* Close the file descriptor FD. */ | |
178 | extern int __close __P ((int __fd)); | |
179 | extern int close __P ((int __fd)); | |
180 | ||
181 | /* Read NBYTES into BUF from FD. Return the | |
182 | number read, -1 for errors or 0 for EOF. */ | |
183 | extern ssize_t __read __P ((int __fd, __ptr_t __buf, size_t __nbytes)); | |
184 | extern ssize_t read __P ((int __fd, __ptr_t __buf, size_t __nbytes)); | |
185 | ||
186 | /* Write N bytes of BUF to FD. Return the number written, or -1. */ | |
187 | extern ssize_t __write __P ((int __fd, __const __ptr_t __buf, size_t __n)); | |
188 | extern ssize_t write __P ((int __fd, __const __ptr_t __buf, size_t __n)); | |
189 | ||
190 | ||
191 | /* Create a one-way communication channel (pipe). | |
192 | If successul, two file descriptors are stored in PIPEDES; | |
193 | bytes written on PIPEDES[1] can be read from PIPEDES[0]. | |
194 | Returns 0 if successful, -1 if not. */ | |
195 | extern int __pipe __P ((int __pipedes[2])); | |
196 | extern int pipe __P ((int __pipedes[2])); | |
197 | ||
198 | /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. | |
199 | If SECONDS is zero, any currently scheduled alarm will be cancelled. | |
200 | The function returns the number of seconds remaining until the last | |
201 | alarm scheduled would have signaled, or zero if there wasn't one. | |
202 | There is no return value to indicate an error, but you can set `errno' | |
203 | to 0 and check its value after calling `alarm', and this might tell you. | |
204 | The signal may come late due to processor scheduling. */ | |
205 | extern unsigned int alarm __P ((unsigned int __seconds)); | |
206 | ||
207 | /* Make the process sleep for SECONDS seconds, or until a signal arrives | |
208 | and is not ignored. The function returns the number of seconds less | |
209 | than SECONDS which it actually slept (thus zero if it slept the full time). | |
210 | If a signal handler does a `longjmp' or modifies the handling of the | |
211 | SIGALRM signal while inside `sleep' call, the handling of the SIGALRM | |
212 | signal afterwards is undefined. There is no return value to indicate | |
213 | error, but if `sleep' returns SECONDS, it probably didn't work. */ | |
214 | extern unsigned int sleep __P ((unsigned int __seconds)); | |
215 | ||
52e9a9d1 RM |
216 | #ifdef __USE_BSD |
217 | /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked | |
218 | or ignored. Return value is not necessarily useful. */ | |
219 | extern unsigned int usleep __P ((unsigned __useconds)); | |
220 | #endif | |
221 | ||
28f540f4 RM |
222 | |
223 | /* Suspend the process until a signal arrives. | |
224 | This always returns -1 and sets `errno' to EINTR. */ | |
225 | extern int pause __P ((void)); | |
226 | ||
227 | ||
228 | /* Change the owner and group of FILE. */ | |
229 | extern int __chown __P ((__const char *__file, | |
230 | __uid_t __owner, __gid_t __group)); | |
231 | extern int chown __P ((__const char *__file, | |
232 | __uid_t __owner, __gid_t __group)); | |
233 | ||
234 | #ifdef __USE_BSD | |
235 | /* Change the owner and group of the file that FD is open on. */ | |
236 | extern int __fchown __P ((int __fd, | |
237 | __uid_t __owner, __gid_t __group)); | |
238 | extern int fchown __P ((int __fd, | |
239 | __uid_t __owner, __gid_t __group)); | |
240 | #endif /* Use BSD. */ | |
241 | ||
242 | /* Change the process's working directory to PATH. */ | |
243 | extern int __chdir __P ((__const char *__path)); | |
244 | extern int chdir __P ((__const char *__path)); | |
245 | ||
246 | #ifdef __USE_BSD | |
247 | /* Change the process's working directory to the one FD is open on. */ | |
248 | extern int fchdir __P ((int __fd)); | |
249 | #endif | |
250 | ||
251 | /* Get the pathname of the current working directory, | |
252 | and put it in SIZE bytes of BUF. Returns NULL if the | |
253 | directory couldn't be determined or SIZE was too small. | |
254 | If successful, returns BUF. In GNU, if BUF is NULL, | |
255 | an array is allocated with `malloc'; the array is SIZE | |
256 | bytes long, unless SIZE <= 0, in which case it is as | |
257 | big as necessary. */ | |
3ec41e03 | 258 | extern char *__getcwd __P ((char *__buf, size_t __size)); |
28f540f4 RM |
259 | extern char *getcwd __P ((char *__buf, size_t __size)); |
260 | ||
261 | #ifdef __USE_GNU | |
262 | /* Return a malloc'd string containing the current directory name. | |
263 | If the environment variable `PWD' is set, and its value is correct, | |
264 | that value is used. */ | |
265 | extern char *get_current_dir_name __P ((void)); | |
fa0bc87c RM |
266 | |
267 | /* Get the canonical absolute name of the named directory, and put it in SIZE | |
268 | bytes of BUF. Returns NULL if the directory couldn't be determined or | |
269 | SIZE was too small. If successful, returns BUF. In GNU, if BUF is | |
270 | NULL, an array is allocated with `malloc'; the array is SIZE bytes long, | |
271 | unless SIZE <= 0, in which case it is as big as necessary. */ | |
272 | ||
273 | char *__canonicalize_directory_name_internal __P ((const char *__thisdir, | |
274 | char *__buf, | |
275 | size_t __size)); | |
28f540f4 RM |
276 | #endif |
277 | ||
278 | #ifdef __USE_BSD | |
279 | /* Put the absolute pathname of the current working directory in BUF. | |
280 | If successful, return BUF. If not, put an error message in | |
281 | BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ | |
282 | extern char *getwd __P ((char *__buf)); | |
283 | #endif | |
284 | ||
285 | ||
286 | /* Duplicate FD, returning a new file descriptor on the same file. */ | |
287 | extern int __dup __P ((int __fd)); | |
288 | extern int dup __P ((int __fd)); | |
289 | ||
290 | /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ | |
291 | extern int __dup2 __P ((int __fd, int __fd2)); | |
292 | extern int dup2 __P ((int __fd, int __fd2)); | |
293 | ||
294 | /* NULL-terminated array of "NAME=VALUE" environment variables. */ | |
295 | extern char **__environ; | |
296 | extern char **environ; | |
297 | ||
298 | ||
299 | /* Replace the current process, executing PATH with arguments ARGV and | |
300 | environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ | |
301 | extern int __execve __P ((__const char *__path, char *__const __argv[], | |
302 | char *__const __envp[])); | |
303 | extern int execve __P ((__const char *__path, char *__const __argv[], | |
304 | char *__const __envp[])); | |
305 | ||
306 | #ifdef __USE_GNU | |
307 | /* Execute the file FD refers to, overlaying the running program image. | |
308 | ARGV and ENVP are passed to the new program, as for `execve'. */ | |
309 | extern int fexecve __P ((int __fd, | |
310 | char *const __argv[], char *const __envp[])); | |
311 | ||
312 | #endif | |
313 | ||
314 | ||
315 | /* Execute PATH with arguments ARGV and environment from `environ'. */ | |
316 | extern int execv __P ((__const char *__path, char *__const __argv[])); | |
317 | ||
318 | /* Execute PATH with all arguments after PATH until a NULL pointer, | |
319 | and the argument after that for environment. */ | |
320 | extern int execle __P ((__const char *__path, __const char *__arg,...)); | |
321 | ||
322 | /* Execute PATH with all arguments after PATH until | |
323 | a NULL pointer and environment from `environ'. */ | |
324 | extern int execl __P ((__const char *__path, __const char *__arg,...)); | |
325 | ||
326 | /* Execute FILE, searching in the `PATH' environment variable if it contains | |
327 | no slashes, with arguments ARGV and environment from `environ'. */ | |
328 | extern int execvp __P ((__const char *__file, char *__const __argv[])); | |
329 | ||
330 | /* Execute FILE, searching in the `PATH' environment variable if | |
331 | it contains no slashes, with all arguments after FILE until a | |
332 | NULL pointer and environment from `environ'. */ | |
333 | extern int execlp __P ((__const char *__file, ...)); | |
334 | ||
335 | ||
336 | /* Terminate program execution with the low-order 8 bits of STATUS. */ | |
337 | extern void _exit __P ((int __status)) __attribute__ ((__noreturn__)); | |
338 | ||
339 | ||
340 | /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; | |
341 | the `_SC_*' symbols for the NAME argument to `sysconf'; | |
342 | and the `_CS_*' symbols for the NAME argument to `confstr'. */ | |
343 | #include <confname.h> | |
344 | ||
345 | /* Get file-specific configuration information about PATH. */ | |
346 | extern long int __pathconf __P ((__const char *__path, int __name)); | |
347 | extern long int pathconf __P ((__const char *__path, int __name)); | |
348 | ||
349 | /* Get file-specific configuration about descriptor FD. */ | |
350 | extern long int __fpathconf __P ((int __fd, int __name)); | |
351 | extern long int fpathconf __P ((int __fd, int __name)); | |
352 | ||
353 | /* Get the value of the system variable NAME. */ | |
354 | extern long int __sysconf __P ((int __name)); | |
355 | extern long int sysconf __P ((int __name)); | |
356 | ||
357 | #ifdef __USE_POSIX2 | |
358 | /* Get the value of the string-valued system variable NAME. */ | |
359 | extern size_t confstr __P ((int __name, char *__buf, size_t __len)); | |
360 | #endif | |
361 | ||
362 | ||
363 | /* Get the process ID of the calling process. */ | |
364 | extern __pid_t __getpid __P ((void)); | |
365 | extern __pid_t getpid __P ((void)); | |
366 | ||
367 | /* Get the process ID of the calling process's parent. */ | |
368 | extern __pid_t __getppid __P ((void)); | |
369 | extern __pid_t getppid __P ((void)); | |
370 | ||
371 | /* Get the process group ID of the calling process. */ | |
372 | extern __pid_t getpgrp __P ((void)); | |
373 | ||
374 | /* Set the process group ID of the process matching PID to PGID. | |
375 | If PID is zero, the current process's process group ID is set. | |
376 | If PGID is zero, the process ID of the process is used. */ | |
377 | extern int setpgid __P ((__pid_t __pid, __pid_t __pgid)); | |
378 | ||
379 | /* Get the process group ID of process PID. */ | |
380 | extern __pid_t __getpgid __P ((__pid_t __pid)); | |
381 | #ifdef __USE_GNU | |
382 | extern __pid_t getpgid __P ((__pid_t __pid)); | |
383 | #endif | |
384 | ||
b20e47cb RM |
385 | #if defined (__USE_SVID) || defined (__USE_BSD) |
386 | /* Both System V and BSD have `setpgrp' functions, but with different | |
387 | calling conventions. The BSD function is the same as POSIX.1 `setpgid' | |
388 | (above). The System V function takes no arguments and puts the calling | |
389 | process in its on group like `setpgid (0, 0)'. | |
390 | ||
391 | New programs should always use `setpgid' instead. | |
392 | ||
393 | The default in GNU is to provide the System V function. The BSD | |
394 | function is available under -D_BSD_SOURCE with -lbsd-compat. */ | |
395 | ||
396 | #ifndef __FAVOR_BSD | |
397 | ||
398 | /* Set the process group ID of the calling process to its own PID. | |
399 | This is exactly the same as `setpgid (0, 0)'. */ | |
400 | extern int setpgrp __P ((void)); | |
401 | ||
402 | #else | |
403 | ||
404 | /* Another name for `setpgid' (above). */ | |
28f540f4 | 405 | extern int setpgrp __P ((__pid_t __pid, __pid_t __pgrp)); |
b20e47cb RM |
406 | |
407 | #endif /* Favor BSD. */ | |
408 | #endif /* Use SVID or BSD. */ | |
28f540f4 RM |
409 | |
410 | /* Create a new session with the calling process as its leader. | |
411 | The process group IDs of the session and the calling process | |
412 | are set to the process ID of the calling process, which is returned. */ | |
413 | extern __pid_t __setsid __P ((void)); | |
414 | extern __pid_t setsid __P ((void)); | |
415 | ||
b7843ea9 RM |
416 | #ifdef __USE_GNU |
417 | /* Return the session ID of the given process. */ | |
418 | extern __pid_t getsid __P ((__pid_t)); | |
419 | #endif | |
420 | ||
28f540f4 RM |
421 | /* Get the real user ID of the calling process. */ |
422 | extern __uid_t __getuid __P ((void)); | |
423 | extern __uid_t getuid __P ((void)); | |
424 | ||
425 | /* Get the effective user ID of the calling process. */ | |
426 | extern __uid_t __geteuid __P ((void)); | |
427 | extern __uid_t geteuid __P ((void)); | |
428 | ||
429 | /* Get the real group ID of the calling process. */ | |
430 | extern __gid_t __getgid __P ((void)); | |
431 | extern __gid_t getgid __P ((void)); | |
432 | ||
433 | /* Get the effective group ID of the calling process. */ | |
434 | extern __gid_t __getegid __P ((void)); | |
435 | extern __gid_t getegid __P ((void)); | |
436 | ||
437 | /* If SIZE is zero, return the number of supplementary groups | |
438 | the calling process is in. Otherwise, fill in the group IDs | |
439 | of its supplementary groups in LIST and return the number written. */ | |
440 | extern int __getgroups __P ((int __size, __gid_t __list[])); | |
441 | extern int getgroups __P ((int __size, __gid_t __list[])); | |
442 | ||
3bbceb12 RM |
443 | #ifdef __USE_GNU |
444 | /* Return nonzero iff the calling process is in group GID. */ | |
445 | extern int __group_member __P ((__gid_t __gid)); | |
446 | extern int group_member __P ((__gid_t __gid)); | |
447 | #endif | |
448 | ||
28f540f4 RM |
449 | /* Set the user ID of the calling process to UID. |
450 | If the calling process is the super-user, set the real | |
451 | and effective user IDs, and the saved set-user-ID to UID; | |
452 | if not, the effective user ID is set to UID. */ | |
453 | extern int __setuid __P ((__uid_t __uid)); | |
454 | extern int setuid __P ((__uid_t __uid)); | |
455 | ||
456 | #ifdef __USE_BSD | |
457 | /* Set the real user ID of the calling process to RUID, | |
458 | and the effective user ID of the calling process to EUID. */ | |
459 | extern int __setreuid __P ((__uid_t __ruid, __uid_t __euid)); | |
460 | extern int setreuid __P ((__uid_t __ruid, __uid_t __euid)); | |
461 | ||
462 | /* Set the effective user ID of the calling process to UID. */ | |
463 | extern int seteuid __P ((__uid_t __uid)); | |
464 | #endif /* Use BSD. */ | |
465 | ||
466 | /* Set the group ID of the calling process to GID. | |
467 | If the calling process is the super-user, set the real | |
468 | and effective group IDs, and the saved set-group-ID to GID; | |
469 | if not, the effective group ID is set to GID. */ | |
470 | extern int __setgid __P ((__gid_t __gid)); | |
471 | extern int setgid __P ((__gid_t __gid)); | |
472 | ||
473 | #ifdef __USE_BSD | |
474 | /* Set the real group ID of the calling process to RGID, | |
475 | and the effective group ID of the calling process to EGID. */ | |
476 | extern int __setregid __P ((__gid_t __rgid, __gid_t __egid)); | |
477 | extern int setregid __P ((__gid_t __rgid, __gid_t __egid)); | |
478 | ||
479 | /* Set the effective group ID of the calling process to GID. */ | |
480 | extern int setegid __P ((__gid_t __gid)); | |
481 | #endif /* Use BSD. */ | |
482 | ||
483 | ||
484 | /* Clone the calling process, creating an exact copy. | |
485 | Return -1 for errors, 0 to the new process, | |
486 | and the process ID of the new process to the old process. */ | |
487 | extern __pid_t __fork __P ((void)); | |
488 | extern __pid_t fork __P ((void)); | |
489 | ||
490 | #ifdef __USE_BSD | |
491 | /* Clone the calling process, but without copying the whole address space. | |
492 | The the calling process is suspended until the the new process exits or is | |
493 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
494 | and the process ID of the new process to the old process. */ | |
495 | extern __pid_t __vfork __P ((void)); | |
496 | extern __pid_t vfork __P ((void)); | |
497 | #endif /* Use BSD. */ | |
498 | ||
499 | ||
500 | /* Return the pathname of the terminal FD is open on, or NULL on errors. | |
501 | The returned storage is good only until the next call to this function. */ | |
502 | extern char *ttyname __P ((int __fd)); | |
60478656 RM |
503 | #ifdef __USE_REENTRANT |
504 | /* Store at most BUFLEN characters of the pathname of the terminal FD is | |
505 | open on in BUF. Return 0 on success, -1 otherwise. */ | |
506 | extern int ttyname_r __P ((int __fd, char *__buf, int __buflen)); | |
507 | #endif | |
28f540f4 RM |
508 | |
509 | /* Return 1 if FD is a valid descriptor associated | |
510 | with a terminal, zero if not. */ | |
511 | extern int __isatty __P ((int __fd)); | |
512 | extern int isatty __P ((int __fd)); | |
513 | ||
1474b80f RM |
514 | #ifdef __USE_BSD |
515 | /* Return the index into the active-logins file (utmp) for | |
a9df8829 RM |
516 | the controlling terminal. */ |
517 | extern int ttyslot __P ((void)); | |
1474b80f RM |
518 | #endif |
519 | ||
28f540f4 RM |
520 | |
521 | /* Make a link to FROM named TO. */ | |
522 | extern int __link __P ((__const char *__from, __const char *__to)); | |
523 | extern int link __P ((__const char *__from, __const char *__to)); | |
524 | ||
525 | #ifdef __USE_BSD | |
526 | /* Make a symbolic link to FROM named TO. */ | |
527 | extern int __symlink __P ((__const char *__from, __const char *__to)); | |
528 | extern int symlink __P ((__const char *__from, __const char *__to)); | |
529 | ||
530 | /* Read the contents of the symbolic link PATH into no more than | |
531 | LEN bytes of BUF. The contents are not null-terminated. | |
532 | Returns the number of characters read, or -1 for errors. */ | |
533 | extern int __readlink __P ((__const char *__path, char *__buf, size_t __len)); | |
534 | extern int readlink __P ((__const char *__path, char *__buf, size_t __len)); | |
535 | #endif /* Use BSD. */ | |
536 | ||
537 | /* Remove the link NAME. */ | |
538 | extern int __unlink __P ((__const char *__name)); | |
539 | extern int unlink __P ((__const char *__name)); | |
540 | ||
541 | /* Remove the directory PATH. */ | |
542 | extern int __rmdir __P ((__const char *__path)); | |
543 | extern int rmdir __P ((__const char *__path)); | |
544 | ||
545 | ||
546 | /* Return the foreground process group ID of FD. */ | |
547 | extern __pid_t tcgetpgrp __P ((int __fd)); | |
548 | ||
549 | /* Set the foreground process group ID of FD set PGRP_ID. */ | |
550 | extern int tcsetpgrp __P ((int __fd, __pid_t __pgrp_id)); | |
551 | ||
552 | ||
553 | /* Return the login name of the user. */ | |
554 | extern char *getlogin __P ((void)); | |
ee188d55 RM |
555 | #ifdef __USE_REENTRANT |
556 | /* Return at most NAME_LEN characters of the login name of the user in NAME. | |
557 | If it cannot be determined or some other error occured, return the error | |
558 | code. Otherwise return 0. */ | |
559 | extern int getlogin_r __P ((char *__name, size_t __name_len)); | |
560 | #endif | |
28f540f4 RM |
561 | |
562 | #ifdef __USE_BSD | |
563 | /* Set the login name returned by `getlogin'. */ | |
564 | extern int setlogin __P ((__const char *__name)); | |
565 | #endif | |
566 | ||
567 | ||
568 | #ifdef __USE_POSIX2 | |
569 | /* Process the arguments in ARGV (ARGC of them, minus | |
570 | the program name) for options given in OPTS. | |
571 | ||
572 | If `opterr' is zero, no messages are generated | |
573 | for invalid options; it defaults to 1. | |
574 | `optind' is the current index into ARGV. | |
575 | `optarg' is the argument corresponding to the current option. | |
576 | Return the option character from OPTS just read. | |
577 | Return -1 when there are no more options. | |
578 | For unrecognized options, or options missing arguments, | |
579 | `optopt' is set to the option letter, and '?' is returned. | |
580 | ||
581 | The OPTS string is a list of characters which are recognized option | |
582 | letters, optionally followed by colons, specifying that that letter | |
583 | takes an argument, to be placed in `optarg'. | |
584 | ||
585 | If a letter in OPTS is followed by two colons, its argument is optional. | |
586 | This behavior is specific to the GNU `getopt'. | |
587 | ||
588 | The argument `--' causes premature termination of argument scanning, | |
589 | explicitly telling `getopt' that there are no more options. | |
590 | ||
591 | If OPTS begins with `--', then non-option arguments | |
592 | are treated as arguments to the option '\0'. | |
593 | This behavior is specific to the GNU `getopt'. */ | |
594 | extern int getopt __P ((int __argc, char *__const * __argv, | |
595 | __const char *__opts)); | |
596 | extern int opterr; | |
597 | extern int optind; | |
598 | extern int optopt; | |
599 | extern char *optarg; | |
600 | #endif | |
601 | ||
602 | ||
603 | #ifdef __USE_BSD | |
604 | ||
605 | /* Put the name of the current host in no more than LEN bytes of NAME. | |
606 | The result is null-terminated if LEN is large enough for the full | |
607 | name and the terminator. */ | |
608 | extern int __gethostname __P ((char *__name, size_t __len)); | |
609 | extern int gethostname __P ((char *__name, size_t __len)); | |
610 | ||
611 | /* Set the name of the current host to NAME, which is LEN bytes long. | |
612 | This call is restricted to the super-user. */ | |
613 | extern int sethostname __P ((__const char *__name, size_t __len)); | |
614 | ||
615 | /* Return the current machine's Internet number. */ | |
616 | extern long int gethostid __P ((void)); | |
617 | ||
618 | /* Set the current machine's Internet number to ID. | |
619 | This call is restricted to the super-user. */ | |
620 | extern int sethostid __P ((long int __id)); | |
621 | ||
622 | ||
f5348425 RM |
623 | /* Get and set the NIS (aka YP) domain name, if any. |
624 | Called just like `gethostname' and `sethostname'. | |
625 | The NIS domain name is usually the empty string when not using NIS. */ | |
626 | extern int getdomainname __P ((char *__name, size_t __len)); | |
627 | extern int setdomainname __P ((__const char *__name, size_t __len)); | |
628 | ||
629 | ||
28f540f4 RM |
630 | /* Return the number of bytes in a page. This is the system's page size, |
631 | which is not necessarily the same as the hardware page size. */ | |
632 | extern size_t __getpagesize __P ((void)); | |
633 | extern size_t getpagesize __P ((void)); | |
634 | ||
635 | ||
636 | /* Return the maximum number of file descriptors | |
637 | the current process could possibly have. */ | |
638 | extern int __getdtablesize __P ((void)); | |
639 | extern int getdtablesize __P ((void)); | |
640 | ||
641 | ||
642 | /* Truncate FILE to LENGTH bytes. */ | |
643 | extern int truncate __P ((__const char *__file, __off_t __length)); | |
644 | ||
645 | /* Truncate the file FD is open on to LENGTH bytes. */ | |
646 | extern int ftruncate __P ((int __fd, __off_t __length)); | |
647 | ||
648 | ||
649 | /* Make all changes done to FD actually appear on disk. */ | |
650 | extern int fsync __P ((int __fd)); | |
651 | ||
652 | /* Make all changes done to all files actually appear on disk. */ | |
653 | extern int sync __P ((void)); | |
654 | ||
655 | ||
656 | /* Revoke access permissions to all processes currently communicating | |
657 | with the control terminal, and then send a SIGHUP signal to the process | |
658 | group of the control terminal. */ | |
659 | extern int vhangup __P ((void)); | |
660 | ||
342414a6 RM |
661 | /* Revoke the access of all descriptors currently open on FILE. */ |
662 | extern int revoke __P ((const char *__file)); | |
663 | ||
28f540f4 | 664 | |
ea03559a RM |
665 | /* Enable statistical profiling, writing samples of the PC into at most |
666 | SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling | |
667 | is enabled, the system examines the user PC and increments | |
668 | SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, | |
669 | disable profiling. Returns zero on success, -1 on error. */ | |
670 | extern int profil __P ((unsigned short int *__sample_buffer, size_t __size, | |
671 | size_t __offset, unsigned int __scale)); | |
672 | ||
673 | ||
28f540f4 RM |
674 | /* Turn accounting on if NAME is an existing file. The system will then write |
675 | a record for each process as it terminates, to this file. If NAME is NULL, | |
676 | turn accounting off. This call is restricted to the super-user. */ | |
677 | extern int acct __P ((__const char *__name)); | |
678 | ||
679 | /* Make PATH be the root directory (the starting point for absolute paths). | |
680 | This call is restricted to the super-user. */ | |
681 | extern int chroot __P ((__const char *__path)); | |
682 | ||
28f540f4 RM |
683 | |
684 | /* Successive calls return the shells listed in `/etc/shells'. */ | |
685 | extern char *getusershell __P ((void)); | |
686 | extern void endusershell __P ((void)); /* Discard cached info. */ | |
687 | extern void setusershell __P ((void)); /* Rewind and re-read the file. */ | |
688 | ||
689 | ||
690 | /* Prompt with PROMPT and read a string from the terminal without echoing. | |
691 | Uses /dev/tty if possible; otherwise stderr and stdin. */ | |
692 | extern char *getpass __P ((const char *__prompt)); | |
693 | ||
694 | /* Put the program in the background, and dissociate from the controlling | |
695 | terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, | |
696 | redirects stdin, stdout, and stderr to /dev/null. */ | |
697 | extern int daemon __P ((int __nochdir, int __noclose)); | |
698 | ||
699 | #endif /* Use BSD. */ | |
700 | ||
701 | ||
702 | #ifdef __USE_MISC | |
703 | ||
704 | /* Generate a unique temporary file name from TEMPLATE. | |
705 | The last six characters of TEMPLATE must be "XXXXXX"; | |
706 | they are replaced with a string that makes the file name unique. | |
707 | Returns TEMPLATE, or a null pointer if it cannot get a unique file name. */ | |
708 | extern char *mktemp __P ((char *__template)); | |
709 | ||
710 | /* Generate a unique temporary file name from TEMPLATE. | |
711 | The last six characters of TEMPLATE must be "XXXXXX"; | |
712 | they are replaced with a string that makes the filename unique. | |
713 | Returns a file descriptor open on the file for reading and writing, | |
714 | or -1 if it cannot create a uniquely-named file. */ | |
715 | extern int mkstemp __P ((char *__template)); | |
716 | ||
717 | ||
196980f5 RM |
718 | /* Set the end of accessible data space (aka "the break") to ADDR. |
719 | Returns zero on success and -1 for errors (with errno set). */ | |
720 | extern int __brk __P ((__ptr_t __addr)); | |
721 | extern int brk __P ((__ptr_t __addr)); | |
722 | ||
723 | #define __need_ptrdiff_t | |
724 | #include <stddef.h> | |
725 | ||
726 | /* Increase or decrease the end of accessible data space by DELTA bytes. | |
727 | If successful, returns the address the previous end of data space | |
728 | (i.e. the beginning of the new space, if DELTA > 0); | |
729 | returns (void *) -1 for errors (with errno set). */ | |
730 | extern __ptr_t __sbrk __P ((ptrdiff_t __delta)); | |
731 | extern __ptr_t sbrk __P ((ptrdiff_t __delta)); | |
732 | ||
733 | ||
28f540f4 RM |
734 | /* Invoke `system call' number SYSNO, passing it the remaining arguments. |
735 | This is completely system-dependent, and not often useful. | |
736 | ||
737 | In Unix, `syscall' sets `errno' for all errors and most calls return -1 | |
738 | for errors; in many systems you cannot pass arguments or get return | |
739 | values for all system calls (`pipe', `fork', and `getppid' typically | |
740 | among them). | |
741 | ||
742 | In Mach, all system calls take normal arguments and always return an | |
743 | error code (zero for success). */ | |
7f811679 | 744 | extern long int syscall __P ((long int __sysno, ...)); |
28f540f4 RM |
745 | |
746 | #endif /* Use misc. */ | |
747 | ||
748 | ||
749 | #if defined (__USE_MISC) && !defined (F_LOCK) | |
750 | /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both | |
751 | files consistent. Some systems have them there and some here, and some | |
752 | software depends on the macros being defined without including both. */ | |
753 | ||
754 | /* `lockf' is a simpler interface to the locking facilities of `fcntl'. | |
755 | LEN is always relative to the current file position. | |
756 | The CMD argument is one of the following. */ | |
757 | ||
758 | #define F_ULOCK 0 /* Unlock a previously locked region. */ | |
b7843ea9 | 759 | #define F_LOCK 1 /* Lock a region for exclusive use. */ |
28f540f4 RM |
760 | #define F_TLOCK 2 /* Test and lock a region for exclusive use. */ |
761 | #define F_TEST 3 /* Test a region for other processes locks. */ | |
762 | ||
763 | extern int lockf __P ((int __fd, int __cmd, __off_t __len)); | |
764 | #endif /* Use misc and F_LOCK not already defined. */ | |
765 | ||
766 | ||
767 | #ifdef __USE_GNU | |
768 | ||
769 | /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' | |
770 | set to EINTR. */ | |
771 | ||
772 | #define TEMP_FAILURE_RETRY(expression) \ | |
773 | ({ long int __result; \ | |
774 | do __result = (long int) (expression); \ | |
775 | while (__result == -1L && errno == EINTR); \ | |
776 | __result; }) | |
b7843ea9 | 777 | |
28f540f4 RM |
778 | #endif |
779 | ||
7b3547eb RM |
780 | #ifdef __USE_POSIX |
781 | /* Synchronize at least the data part of a file with the underlying | |
782 | media. */ | |
783 | extern int fdatasync __P ((int __fildes)); | |
784 | #endif /* Use POSIX */ | |
785 | ||
28f540f4 RM |
786 | __END_DECLS |
787 | ||
788 | #endif /* unistd.h */ |