1 /* Copyright (C) 1991-2006, 2007, 2008, 2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
19 * POSIX Standard: 2.10 Symbolic Constants <unistd.h>
29 /* These may be used to determine what facilities are present at compile time.
30 Their values can be obtained at run time from `sysconf'. */
33 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */
34 # define _POSIX_VERSION 200809L
35 #elif defined __USE_XOPEN2K
36 /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */
37 # define _POSIX_VERSION 200112L
38 #elif defined __USE_POSIX199506
39 /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */
40 # define _POSIX_VERSION 199506L
41 #elif defined __USE_POSIX199309
42 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */
43 # define _POSIX_VERSION 199309L
45 /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */
46 # define _POSIX_VERSION 199009L
49 /* These are not #ifdef __USE_POSIX2 because they are
50 in the theoretically application-owned namespace. */
53 # define __POSIX2_THIS_VERSION 200809L
54 /* The utilities on GNU systems also correspond to this version. */
55 #elif defined __USE_XOPEN2K
56 /* The utilities on GNU systems also correspond to this version. */
57 # define __POSIX2_THIS_VERSION 200112L
58 #elif defined __USE_POSIX199506
59 /* The utilities on GNU systems also correspond to this version. */
60 # define __POSIX2_THIS_VERSION 199506L
62 /* The utilities on GNU systems also correspond to this version. */
63 # define __POSIX2_THIS_VERSION 199209L
66 /* The utilities on GNU systems also correspond to this version. */
67 #define _POSIX2_VERSION __POSIX2_THIS_VERSION
69 /* If defined, the implementation supports the
70 C Language Bindings Option. */
71 #define _POSIX2_C_BIND __POSIX2_THIS_VERSION
73 /* If defined, the implementation supports the
74 C Language Development Utilities Option. */
75 #define _POSIX2_C_DEV __POSIX2_THIS_VERSION
77 /* If defined, the implementation supports the
78 Software Development Utilities Option. */
79 #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION
81 #if 0 /* uClibc does not provide the utility */
82 /* If defined, the implementation supports the
83 creation of locales with the localedef utility. */
84 #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION
87 /* X/Open version number to which the library conforms. It is selectable. */
89 # define _XOPEN_VERSION 700
90 #elif defined __USE_XOPEN2K
91 # define _XOPEN_VERSION 600
92 #elif defined __USE_UNIX98
93 # define _XOPEN_VERSION 500
95 # define _XOPEN_VERSION 4
98 /* Commands and utilities from XPG4 are available. */
99 #define _XOPEN_XCU_VERSION 4
101 /* We are compatible with the old published standards as well. */
102 #define _XOPEN_XPG2 1
103 #define _XOPEN_XPG3 1
104 #define _XOPEN_XPG4 1
106 /* The X/Open Unix extensions are available. */
107 #define _XOPEN_UNIX 1
109 /* Encryption is present. */
110 #define _XOPEN_CRYPT 1
112 /* The enhanced internationalization capabilities according to XPG4.2
114 #define _XOPEN_ENH_I18N 1
116 /* The legacy interfaces are also available. */
117 #define _XOPEN_LEGACY 1
120 /* Get values of POSIX options:
122 If these symbols are defined, the corresponding features are
123 always available. If not, they may be available sometimes.
124 The current values can be obtained with `sysconf'.
126 _POSIX_JOB_CONTROL Job control is supported.
127 _POSIX_SAVED_IDS Processes have a saved set-user-ID
128 and a saved set-group-ID.
129 _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported.
130 _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported.
131 _POSIX_TIMERS POSIX.4 clocks and timers are supported.
132 _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported.
133 _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported.
134 _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported.
135 _POSIX_FSYNC The fsync function is present.
136 _POSIX_MAPPED_FILES Mapping of files to memory is supported.
137 _POSIX_MEMLOCK Locking of all memory is supported.
138 _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported.
139 _POSIX_MEMORY_PROTECTION Setting of memory protections is supported.
140 _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported.
141 _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported.
142 _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported.
143 _POSIX_THREADS POSIX.1c pthreads are supported.
144 _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported.
145 _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported.
146 _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported.
147 _POSIX_THREAD_PRIORITY_SCHEDULING
148 POSIX.1c thread execution scheduling supported.
149 _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported.
150 _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported.
151 _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported.
152 _POSIX_PII Protocol-independent interfaces are supported.
153 _POSIX_PII_XTI XTI protocol-indep. interfaces are supported.
154 _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported.
155 _POSIX_PII_INTERNET Internet family of protocols supported.
156 _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported.
157 _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported.
158 _POSIX_PII_OSI ISO/OSI family of protocols supported.
159 _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported.
160 _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported.
161 _POSIX_POLL Implementation supports `poll' function.
162 _POSIX_SELECT Implementation supports `select' and `pselect'.
164 _XOPEN_REALTIME X/Open realtime support is available.
165 _XOPEN_REALTIME_THREADS X/Open realtime thread support is available.
166 _XOPEN_SHM Shared memory interface according to XPG4.2.
168 _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit
169 int, long, pointer, and off_t types.
170 _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit
171 int, long, and pointer and off_t with at least
173 _XBS5_LP64_OFF64 Implementation provides environment with 32-bit
174 int, and 64-bit long, pointer, and off_t types.
175 _XBS5_LPBIG_OFFBIG Implementation provides environment with at
176 least 32 bits int and long, pointer, and off_t
177 with at least 64 bits.
179 If any of these symbols is defined as -1, the corresponding option is not
180 true for any file. If any is defined as other than -1, the corresponding
181 option is true for all files. If a symbol is not defined at all, the value
182 for a specific file can be obtained from `pathconf' and `fpathconf'.
184 _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change
185 the owner of a file. `chown' can only be used
186 to change the group ID of a file to a group of
187 which the calling process is a member.
188 _POSIX_NO_TRUNC Pathname components longer than
189 NAME_MAX generate an error.
190 _POSIX_VDISABLE If defined, if the value of an element of the
191 `c_cc' member of `struct termios' is
192 _POSIX_VDISABLE, no character will have the
193 effect associated with that element.
194 _POSIX_SYNC_IO Synchronous I/O may be performed.
195 _POSIX_ASYNC_IO Asynchronous I/O may be performed.
196 _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed.
198 Support for the Large File Support interface is not generally available.
199 If it is available the following constants are defined to one.
200 _LFS64_LARGEFILE Low-level I/O supports large files.
201 _LFS64_STDIO Standard I/O supports large files.
204 #include <bits/posix_opt.h>
205 /* keep it after posix_opt.h, it overwrites based on uClibc's config options */
206 #include <bits/uClibc_posix_opt.h>
208 /* Get the environment definitions from Unix98. */
209 #if defined __USE_UNIX98 || defined __USE_XOPEN2K
210 # include <bits/environments.h>
213 /* Standard file descriptors. */
214 #define STDIN_FILENO 0 /* Standard input. */
215 #define STDOUT_FILENO 1 /* Standard output. */
216 #define STDERR_FILENO 2 /* Standard error output. */
219 /* All functions that are not declared anywhere else. */
221 #include <bits/types.h>
223 #ifndef __ssize_t_defined
224 typedef __ssize_t ssize_t
;
225 # define __ssize_t_defined
228 #define __need_size_t
232 #if defined __USE_XOPEN || defined __USE_XOPEN2K
233 /* The Single Unix specification says that some more types are
235 # ifndef __gid_t_defined
236 typedef __gid_t gid_t
;
237 # define __gid_t_defined
240 # ifndef __uid_t_defined
241 typedef __uid_t uid_t
;
242 # define __uid_t_defined
245 # ifndef __off_t_defined
246 # ifndef __USE_FILE_OFFSET64
247 typedef __off_t off_t
;
249 typedef __off64_t off_t
;
251 # define __off_t_defined
253 # if defined __USE_LARGEFILE64 && !defined __off64_t_defined
254 typedef __off64_t off64_t
;
255 # define __off64_t_defined
258 # ifndef __useconds_t_defined
259 typedef __useconds_t useconds_t
;
260 # define __useconds_t_defined
263 # ifndef __pid_t_defined
264 typedef __pid_t pid_t
;
265 # define __pid_t_defined
269 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
270 # ifndef __intptr_t_defined
271 typedef __intptr_t
intptr_t;
272 # define __intptr_t_defined
276 #if defined __USE_BSD || defined __USE_XOPEN
277 # ifndef __socklen_t_defined
278 typedef __socklen_t socklen_t
;
279 # define __socklen_t_defined
283 /* Values for the second argument to access.
284 These may be OR'd together. */
285 #define R_OK 4 /* Test for read permission. */
286 #define W_OK 2 /* Test for write permission. */
287 #define X_OK 1 /* Test for execute permission. */
288 #define F_OK 0 /* Test for existence. */
290 /* Test for access to NAME using the real UID and real GID. */
291 extern int access (const char *__name
, int __type
) __THROW
__nonnull ((1));
293 #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
294 /* Test for access to NAME using the effective UID and GID
295 (as normal file operations use). */
296 extern int euidaccess (const char *__name
, int __type
)
297 __THROW
__nonnull ((1));
299 /* An alias for `euidaccess', used by some other systems. */
300 extern int eaccess (const char *__name
, int __type
)
301 __THROW
__nonnull ((1));
305 /* Test for access to FILE relative to the directory FD is open on.
306 If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess',
307 otherwise use real IDs like `access'. */
308 extern int faccessat (int __fd
, const char *__file
, int __type
, int __flag
)
309 __THROW
__nonnull ((2)) __wur
;
310 libc_hidden_proto(faccessat
)
311 #endif /* Use GNU. */
314 /* Values for the WHENCE argument to lseek. */
315 #ifndef _STDIO_H /* <stdio.h> has the same definitions. */
316 # define SEEK_SET 0 /* Seek from beginning of file. */
317 # define SEEK_CUR 1 /* Seek from current position. */
318 # define SEEK_END 2 /* Seek from end of file. */
321 #if defined __USE_BSD && !defined L_SET
322 /* Old BSD names for the same constants; just for compatibility. */
323 # define L_SET SEEK_SET
324 # define L_INCR SEEK_CUR
325 # define L_XTND SEEK_END
329 /* Move FD's file position to OFFSET bytes from the
330 beginning of the file (if WHENCE is SEEK_SET),
331 the current position (if WHENCE is SEEK_CUR),
332 or the end of the file (if WHENCE is SEEK_END).
333 Return the new file position. */
334 #ifndef __USE_FILE_OFFSET64
335 extern __off_t
lseek (int __fd
, __off_t __offset
, int __whence
) __THROW
;
337 extern __typeof(lseek
) __lseek_nocancel attribute_hidden
;
338 libc_hidden_proto(lseek
)
341 # ifdef __REDIRECT_NTH
342 extern __off64_t
__REDIRECT_NTH (lseek
,
343 (int __fd
, __off64_t __offset
, int __whence
),
346 # define lseek lseek64
349 #ifdef __USE_LARGEFILE64
350 extern __off64_t
lseek64 (int __fd
, __off64_t __offset
, int __whence
)
353 extern __typeof(lseek64
) __lseek64_nocancel attribute_hidden
;
354 libc_hidden_proto(lseek64
)
358 /* Close the file descriptor FD.
360 This function is a cancellation point and therefore not marked with
362 extern int close (int __fd
);
364 extern __typeof(close
) __close_nocancel attribute_hidden
;
365 extern void __close_nocancel_no_status(int) attribute_hidden
;
366 libc_hidden_proto(close
)
369 /* Read NBYTES into BUF from FD. Return the
370 number read, -1 for errors or 0 for EOF.
372 This function is a cancellation point and therefore not marked with
374 extern ssize_t
read (int __fd
, void *__buf
, size_t __nbytes
) __wur
;
376 extern __typeof(read
) __read_nocancel attribute_hidden
;
377 libc_hidden_proto(read
)
380 /* Write N bytes of BUF to FD. Return the number written, or -1.
382 This function is a cancellation point and therefore not marked with
384 extern ssize_t
write (int __fd
, const void *__buf
, size_t __n
) __wur
;
386 extern __typeof(write
) __write_nocancel attribute_hidden
;
387 libc_hidden_proto(write
)
390 #if defined __USE_UNIX98 || defined __USE_XOPEN2K8
391 # ifndef __USE_FILE_OFFSET64
392 /* Read NBYTES into BUF from FD at the given position OFFSET without
393 changing the file pointer. Return the number read, -1 for errors
396 This function is a cancellation point and therefore not marked with
398 extern ssize_t
pread (int __fd
, void *__buf
, size_t __nbytes
,
399 __off_t __offset
) __wur
;
401 /* Write N bytes of BUF to FD at the given position OFFSET without
402 changing the file pointer. Return the number written, or -1.
404 This function is a cancellation point and therefore not marked with
406 extern ssize_t
pwrite (int __fd
, const void *__buf
, size_t __n
,
407 __off_t __offset
) __wur
;
410 extern ssize_t
__REDIRECT (pread
, (int __fd
, void *__buf
, size_t __nbytes
,
413 extern ssize_t
__REDIRECT (pwrite
, (int __fd
, const void *__buf
,
414 size_t __nbytes
, __off64_t __offset
),
417 # define pread pread64
418 # define pwrite pwrite64
422 # ifdef __USE_LARGEFILE64
423 /* Read NBYTES into BUF from FD at the given position OFFSET without
424 changing the file pointer. Return the number read, -1 for errors
426 extern ssize_t
pread64 (int __fd
, void *__buf
, size_t __nbytes
,
427 __off64_t __offset
) __wur
;
428 /* Write N bytes of BUF to FD at the given position OFFSET without
429 changing the file pointer. Return the number written, or -1. */
430 extern ssize_t
pwrite64 (int __fd
, const void *__buf
, size_t __n
,
431 __off64_t __offset
) __wur
;
435 /* Create a one-way communication channel (pipe).
436 If successful, two file descriptors are stored in PIPEDES;
437 bytes written on PIPEDES[1] can be read from PIPEDES[0].
438 Returns 0 if successful, -1 if not. */
439 extern int pipe (int __pipedes
[2]) __THROW __wur
;
440 libc_hidden_proto(pipe
)
442 #if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU
443 /* Same as pipe but apply flags passed in FLAGS to the new file
445 extern int pipe2 (int __pipedes
[2], int __flags
) __THROW __wur
;
446 libc_hidden_proto(pipe2
)
449 /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM.
450 If SECONDS is zero, any currently scheduled alarm will be cancelled.
451 The function returns the number of seconds remaining until the last
452 alarm scheduled would have signaled, or zero if there wasn't one.
453 There is no return value to indicate an error, but you can set `errno'
454 to 0 and check its value after calling `alarm', and this might tell you.
455 The signal may come late due to processor scheduling. */
456 extern unsigned int alarm (unsigned int __seconds
) __THROW
;
457 libc_hidden_proto(alarm
)
459 /* Make the process sleep for SECONDS seconds, or until a signal arrives
460 and is not ignored. The function returns the number of seconds less
461 than SECONDS which it actually slept (thus zero if it slept the full time).
462 If a signal handler does a `longjmp' or modifies the handling of the
463 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM
464 signal afterwards is undefined. There is no return value to indicate
465 error, but if `sleep' returns SECONDS, it probably didn't work.
467 This function is a cancellation point and therefore not marked with
469 extern unsigned int sleep (unsigned int __seconds
);
470 libc_hidden_proto(sleep
)
472 #if (defined __USE_BSD \
473 || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
474 ) && defined __UCLIBC_SUSV3_LEGACY__
475 /* Set an alarm to go off (generating a SIGALRM signal) in VALUE
476 microseconds. If INTERVAL is nonzero, when the alarm goes off, the
477 timer is reset to go off every INTERVAL microseconds thereafter.
478 Returns the number of microseconds remaining before the alarm. */
479 extern __useconds_t
ualarm (__useconds_t __value
, __useconds_t __interval
)
482 /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked
485 This function is a cancellation point and therefore not marked with
487 extern int usleep (__useconds_t __useconds
);
491 /* Suspend the process until a signal arrives.
492 This always returns -1 and sets `errno' to EINTR.
494 This function is a cancellation point and therefore not marked with
496 extern int pause (void);
499 /* Change the owner and group of FILE. */
500 extern int chown (const char *__file
, __uid_t __owner
, __gid_t __group
)
501 __THROW
__nonnull ((1)) __wur
;
502 libc_hidden_proto(chown
)
504 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
505 /* Change the owner and group of the file that FD is open on. */
506 extern int fchown (int __fd
, __uid_t __owner
, __gid_t __group
) __THROW __wur
;
509 /* Change owner and group of FILE, if it is a symbolic
510 link the ownership of the symbolic link is changed. */
511 extern int lchown (const char *__file
, __uid_t __owner
, __gid_t __group
)
512 __THROW
__nonnull ((1)) __wur
;
514 #endif /* Use BSD || X/Open Unix. */
517 /* Change the owner and group of FILE relative to the directory FD is open
519 extern int fchownat (int __fd
, const char *__file
, __uid_t __owner
,
520 __gid_t __group
, int __flag
)
521 __THROW
__nonnull ((2)) __wur
;
522 libc_hidden_proto(fchownat
)
523 #endif /* Use GNU. */
525 /* Change the process's working directory to PATH. */
526 extern int chdir (const char *__path
) __THROW
__nonnull ((1)) __wur
;
527 libc_hidden_proto(chdir
)
529 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
530 /* Change the process's working directory to the one FD is open on. */
531 extern int fchdir (int __fd
) __THROW __wur
;
532 libc_hidden_proto(fchdir
)
535 /* Get the pathname of the current working directory,
536 and put it in SIZE bytes of BUF. Returns NULL if the
537 directory couldn't be determined or SIZE was too small.
538 If successful, returns BUF. In GNU, if BUF is NULL,
539 an array is allocated with `malloc'; the array is SIZE
540 bytes long, unless SIZE == 0, in which case it is as
542 extern char *getcwd (char *__buf
, size_t __size
) __THROW __wur
;
543 libc_hidden_proto(getcwd
)
546 /* Return a malloc'd string containing the current directory name.
547 If the environment variable `PWD' is set, and its value is correct,
548 that value is used. */
549 extern char *get_current_dir_name (void) __THROW
;
552 #if 0 /*defined __USE_BSD || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8)*/
553 /* Put the absolute pathname of the current working directory in BUF.
554 If successful, return BUF. If not, put an error message in
555 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */
556 extern char *getwd (char *__buf
)
557 __THROW
__nonnull ((1)) __attribute_deprecated__ __wur
;
561 /* Duplicate FD, returning a new file descriptor on the same file. */
562 extern int dup (int __fd
) __THROW __wur
;
564 /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */
565 extern int dup2 (int __fd
, int __fd2
) __THROW
;
566 libc_hidden_proto(dup2
)
569 /* Duplicate FD to FD2, closing FD2 and making it open on the same
570 file while setting flags according to FLAGS. */
571 extern int dup3 (int __fd
, int __fd2
, int __flags
) __THROW
;
572 libc_hidden_proto(dup3
)
575 /* NULL-terminated array of "NAME=VALUE" environment variables. */
576 extern char **__environ
;
578 extern char **environ
;
582 /* Replace the current process, executing PATH with arguments ARGV and
583 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */
584 extern int execve (const char *__path
, char *const __argv
[],
585 char *const __envp
[]) __THROW
__nonnull ((1, 2));
586 libc_hidden_proto(execve
)
588 #if 0 /*def __USE_XOPEN2K8*/
589 /* Execute the file FD refers to, overlaying the running program image.
590 ARGV and ENVP are passed to the new program, as for `execve'. */
591 extern int fexecve (int __fd
, char *const __argv
[], char *const __envp
[])
592 __THROW
__nonnull ((2));
596 /* Execute PATH with arguments ARGV and environment from `environ'. */
597 extern int execv (const char *__path
, char *const __argv
[])
598 __THROW
__nonnull ((1, 2));
599 libc_hidden_proto(execv
)
601 /* Execute PATH with all arguments after PATH until a NULL pointer,
602 and the argument after that for environment. */
603 extern int execle (const char *__path
, const char *__arg
, ...)
604 __THROW
__nonnull ((1, 2));
605 libc_hidden_proto(execle
)
607 /* Execute PATH with all arguments after PATH until
608 a NULL pointer and environment from `environ'. */
609 extern int execl (const char *__path
, const char *__arg
, ...)
610 __THROW
__nonnull ((1, 2));
611 libc_hidden_proto(execl
)
613 /* Execute FILE, searching in the `PATH' environment variable if it contains
614 no slashes, with arguments ARGV and environment from `environ'. */
615 extern int execvp (const char *__file
, char *const __argv
[])
616 __THROW
__nonnull ((1, 2));
617 libc_hidden_proto(execvp
)
619 /* Execute FILE, searching in the `PATH' environment variable if
620 it contains no slashes, with all arguments after FILE until a
621 NULL pointer and environment from `environ'. */
622 extern int execlp (const char *__file
, const char *__arg
, ...)
623 __THROW
__nonnull ((1, 2));
624 libc_hidden_proto(execlp
)
627 /* Execute FILE, searching in the `PATH' environment variable if it contains
628 no slashes, with arguments ARGV and environment from a pointer */
629 extern int execvpe (const char *__file
, char *const __argv
[],
630 char *const __envp
[])
631 __THROW
__nonnull ((1, 2));
632 libc_hidden_proto(execvpe
)
636 #if defined __USE_MISC || defined __USE_XOPEN
637 /* Add INC to priority of the current process. */
638 extern int nice (int __inc
) __THROW __wur
;
642 /* Terminate program execution with the low-order 8 bits of STATUS. */
643 extern void _exit (int __status
) __attribute__ ((__noreturn__
));
644 libc_hidden_proto(_exit
)
647 /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf';
648 the `_SC_*' symbols for the NAME argument to `sysconf';
649 and the `_CS_*' symbols for the NAME argument to `confstr'. */
650 #include <bits/confname.h>
652 /* Get file-specific configuration information about PATH. */
653 extern long int pathconf (const char *__path
, int __name
)
654 __THROW
__nonnull ((1));
656 /* Get file-specific configuration about descriptor FD. */
657 extern long int fpathconf (int __fd
, int __name
) __THROW
;
659 /* Get the value of the system variable NAME. */
660 extern long int sysconf (int __name
) __THROW
;
661 libc_hidden_proto(sysconf
)
664 /* Get the value of the string-valued system variable NAME. */
665 extern size_t confstr (int __name
, char *__buf
, size_t __len
) __THROW
;
669 /* Get the process ID of the calling process. */
670 extern __pid_t
getpid (void) __THROW
;
671 libc_hidden_proto(getpid
)
673 /* Get the process ID of the calling process's parent. */
674 extern __pid_t
getppid (void) __THROW
;
676 /* Get the process group ID of the calling process.
677 This function is different on old BSD. */
679 extern __pid_t
getpgrp (void) __THROW
;
681 # ifdef __REDIRECT_NTH
682 extern __pid_t
__REDIRECT_NTH (getpgrp
, (__pid_t __pid
), __getpgid
);
684 # define getpgrp __getpgid
688 /* Get the process group ID of process PID. */
689 extern __pid_t
__getpgid (__pid_t __pid
) __THROW
;
690 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
691 extern __pid_t
getpgid (__pid_t __pid
) __THROW
;
695 /* Set the process group ID of the process matching PID to PGID.
696 If PID is zero, the current process's process group ID is set.
697 If PGID is zero, the process ID of the process is used. */
698 extern int setpgid (__pid_t __pid
, __pid_t __pgid
) __THROW
;
699 libc_hidden_proto(setpgid
)
701 #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED
702 /* Both System V and BSD have `setpgrp' functions, but with different
703 calling conventions. The BSD function is the same as POSIX.1 `setpgid'
704 (above). The System V function takes no arguments and puts the calling
705 process in its on group like `setpgid (0, 0)'.
707 New programs should always use `setpgid' instead.
709 The default in GNU is to provide the System V function. The BSD
710 function is available under -D_BSD_SOURCE. */
714 /* Set the process group ID of the calling process to its own PID.
715 This is exactly the same as `setpgid (0, 0)'. */
716 extern int setpgrp (void) __THROW
;
720 /* Another name for `setpgid' (above). */
721 # ifdef __REDIRECT_NTH
722 extern int __REDIRECT_NTH (setpgrp
, (__pid_t __pid
, __pid_t __pgrp
), setpgid
);
724 # define setpgrp setpgid
727 # endif /* Favor BSD. */
728 #endif /* Use SVID or BSD. */
730 /* Create a new session with the calling process as its leader.
731 The process group IDs of the session and the calling process
732 are set to the process ID of the calling process, which is returned. */
733 extern __pid_t
setsid (void) __THROW
;
734 libc_hidden_proto(setsid
)
736 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
737 /* Return the session ID of the given process. */
738 extern __pid_t
getsid (__pid_t __pid
) __THROW
;
739 libc_hidden_proto(getsid
)
742 /* Get the real user ID of the calling process. */
743 extern __uid_t
getuid (void) __THROW
;
744 libc_hidden_proto(getuid
)
746 /* Get the effective user ID of the calling process. */
747 extern __uid_t
geteuid (void) __THROW
;
748 libc_hidden_proto(geteuid
)
750 /* Get the real group ID of the calling process. */
751 extern __gid_t
getgid (void) __THROW
;
752 libc_hidden_proto(getgid
)
754 /* Get the effective group ID of the calling process. */
755 extern __gid_t
getegid (void) __THROW
;
756 libc_hidden_proto(getegid
)
758 /* If SIZE is zero, return the number of supplementary groups
759 the calling process is in. Otherwise, fill in the group IDs
760 of its supplementary groups in LIST and return the number written. */
761 extern int getgroups (int __size
, __gid_t __list
[]) __THROW __wur
;
762 libc_hidden_proto(getgroups
)
764 #if 0 /*def __USE_GNU*/
765 /* Return nonzero iff the calling process is in group GID. */
766 extern int group_member (__gid_t __gid
) __THROW
;
769 /* Set the user ID of the calling process to UID.
770 If the calling process is the super-user, set the real
771 and effective user IDs, and the saved set-user-ID to UID;
772 if not, the effective user ID is set to UID. */
773 extern int setuid (__uid_t __uid
) __THROW __wur
;
775 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
776 /* Set the real user ID of the calling process to RUID,
777 and the effective user ID of the calling process to EUID. */
778 extern int setreuid (__uid_t __ruid
, __uid_t __euid
) __THROW __wur
;
779 libc_hidden_proto(setreuid
)
782 #if defined __USE_BSD || defined __USE_XOPEN2K
783 /* Set the effective user ID of the calling process to UID. */
784 extern int seteuid (__uid_t __uid
) __THROW __wur
;
785 libc_hidden_proto(seteuid
)
788 /* Set the group ID of the calling process to GID.
789 If the calling process is the super-user, set the real
790 and effective group IDs, and the saved set-group-ID to GID;
791 if not, the effective group ID is set to GID. */
792 extern int setgid (__gid_t __gid
) __THROW __wur
;
794 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
795 /* Set the real group ID of the calling process to RGID,
796 and the effective group ID of the calling process to EGID. */
797 extern int setregid (__gid_t __rgid
, __gid_t __egid
) __THROW __wur
;
798 libc_hidden_proto(setregid
)
801 #if defined __USE_BSD || defined __USE_XOPEN2K
802 /* Set the effective group ID of the calling process to GID. */
803 extern int setegid (__gid_t __gid
) __THROW __wur
;
804 #endif /* Use BSD. */
807 /* Fetch the real user ID, effective user ID, and saved-set user ID,
808 of the calling process. */
809 extern int getresuid (__uid_t
*__ruid
, __uid_t
*__euid
, __uid_t
*__suid
)
812 /* Fetch the real group ID, effective group ID, and saved-set group ID,
813 of the calling process. */
814 extern int getresgid (__gid_t
*__rgid
, __gid_t
*__egid
, __gid_t
*__sgid
)
817 #if defined __UCLIBC_LINUX_SPECIFIC__
818 /* Set the real user ID, effective user ID, and saved-set user ID,
819 of the calling process to RUID, EUID, and SUID, respectively. */
820 extern int setresuid (__uid_t __ruid
, __uid_t __euid
, __uid_t __suid
)
822 libc_hidden_proto(setresuid
)
825 /* Set the real group ID, effective group ID, and saved-set group ID,
826 of the calling process to RGID, EGID, and SGID, respectively. */
827 extern int setresgid (__gid_t __rgid
, __gid_t __egid
, __gid_t __sgid
)
829 libc_hidden_proto(setresgid
)
833 #if defined __UCLIBC_HAS_STUBS__ || defined __ARCH_USE_MMU__
834 /* Clone the calling process, creating an exact copy.
835 Return -1 for errors, 0 to the new process,
836 and the process ID of the new process to the old process. */
837 extern __pid_t
fork (void) __THROWNL
;
839 # ifdef __UCLIBC_HAS_THREADS__
840 extern __typeof(fork
) __libc_fork
;
842 libc_hidden_proto(fork
)
846 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
847 /* Clone the calling process, but without copying the whole address space.
848 The calling process is suspended until the new process exits or is
849 replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
850 and the process ID of the new process to the old process. */
851 extern __pid_t
vfork (void) __THROW
;
852 libc_hidden_proto(vfork
)
853 #endif /* Use BSD. */
855 #if 0 /* psm: seems unused , exit-thread.S is not compiled */
856 /* Special exit function which only terminates the current thread. */
857 extern void __exit_thread (int val
) __attribute__ ((__noreturn__
));
860 /* Return the pathname of the terminal FD is open on, or NULL on errors.
861 The returned storage is good only until the next call to this function. */
862 extern char *ttyname (int __fd
) __THROW
;
864 /* Store at most BUFLEN characters of the pathname of the terminal FD is
865 open on in BUF. Return 0 on success, otherwise an error number. */
866 extern int ttyname_r (int __fd
, char *__buf
, size_t __buflen
)
867 __THROW
__nonnull ((2)) __wur
;
868 libc_hidden_proto(ttyname_r
)
870 /* Return 1 if FD is a valid descriptor associated
871 with a terminal, zero if not. */
872 extern int isatty (int __fd
) __THROW
;
873 libc_hidden_proto(isatty
)
875 #if 0 /*defined __USE_BSD \
876 || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)*/
877 /* Return the index into the active-logins file (utmp) for
878 the controlling terminal. */
879 extern int ttyslot (void) __THROW
;
883 /* Make a link to FROM named TO. */
884 extern int link (const char *__from
, const char *__to
)
885 __THROW
__nonnull ((1, 2)) __wur
;
888 /* Like link but relative paths in TO and FROM are interpreted relative
889 to FROMFD and TOFD respectively. */
890 extern int linkat (int __fromfd
, const char *__from
, int __tofd
,
891 const char *__to
, int __flags
)
892 __THROW
__nonnull ((2, 4)) __wur
;
893 libc_hidden_proto(linkat
)
896 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
897 /* Make a symbolic link to FROM named TO. */
898 extern int symlink (const char *__from
, const char *__to
)
899 __THROW
__nonnull ((1, 2)) __wur
;
901 /* Read the contents of the symbolic link PATH into no more than
902 LEN bytes of BUF. The contents are not null-terminated.
903 Returns the number of characters read, or -1 for errors. */
904 extern ssize_t
readlink (const char *__restrict __path
,
905 char *__restrict __buf
, size_t __len
)
906 __THROW
__nonnull ((1, 2)) __wur
;
907 libc_hidden_proto(readlink
)
908 #endif /* Use POSIX.1-2001. */
911 /* Like symlink but a relative path in TO is interpreted relative to TOFD. */
912 extern int symlinkat (const char *__from
, int __tofd
,
913 const char *__to
) __THROW
__nonnull ((1, 3)) __wur
;
914 libc_hidden_proto(symlinkat
)
916 /* Like readlink but a relative PATH is interpreted relative to FD. */
917 extern ssize_t
readlinkat (int __fd
, const char *__restrict __path
,
918 char *__restrict __buf
, size_t __len
)
919 __THROW
__nonnull ((2, 3)) __wur
;
920 libc_hidden_proto(readlinkat
)
923 /* Remove the link NAME. */
924 extern int unlink (const char *__name
) __THROW
__nonnull ((1));
925 libc_hidden_proto(unlink
)
928 /* Remove the link NAME relative to FD. */
929 extern int unlinkat (int __fd
, const char *__name
, int __flag
)
930 __THROW
__nonnull ((2));
931 libc_hidden_proto(unlinkat
)
934 /* Remove the directory PATH. */
935 extern int rmdir (const char *__path
) __THROW
__nonnull ((1));
936 libc_hidden_proto(rmdir
)
939 /* Return the foreground process group ID of FD. */
940 extern __pid_t
tcgetpgrp (int __fd
) __THROW
;
941 libc_hidden_proto(tcgetpgrp
)
943 /* Set the foreground process group ID of FD set PGRP_ID. */
944 extern int tcsetpgrp (int __fd
, __pid_t __pgrp_id
) __THROW
;
947 /* Return the login name of the user.
949 This function is a possible cancellation point and therefore not
950 marked with __THROW. */
951 extern char *getlogin (void);
952 libc_hidden_proto(getlogin
)
953 #if defined __USE_REENTRANT || defined __USE_POSIX199506
954 /* Return at most NAME_LEN characters of the login name of the user in NAME.
955 If it cannot be determined or some other error occurred, return the error
956 code. Otherwise return 0.
958 This function is a possible cancellation point and therefore not
959 marked with __THROW. */
960 extern int getlogin_r (char *__name
, size_t __name_len
) __nonnull ((1));
963 #if 0 /*def __USE_BSD*/
964 /* Set the login name returned by `getlogin'. */
965 extern int setlogin (const char *__name
) __THROW
__nonnull ((1));
970 /* Get definitions and prototypes for functions to process the
971 arguments in ARGV (ARGC of them, minus the program name) for
972 options given in OPTS. */
973 # define __need_getopt
974 /* keep this for uClibc in bits/, we need it when GNU_GETOPT is disabled */
975 # include <bits/getopt.h>
979 #if defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K
980 /* Put the name of the current host in no more than LEN bytes of NAME.
981 The result is null-terminated if LEN is large enough for the full
982 name and the terminator. */
983 extern int gethostname (char *__name
, size_t __len
) __THROW
__nonnull ((1));
984 libc_hidden_proto(gethostname
)
988 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
989 /* Set the name of the current host to NAME, which is LEN bytes long.
990 This call is restricted to the super-user. */
991 extern int sethostname (const char *__name
, size_t __len
)
992 __THROW
__nonnull ((1)) __wur
;
994 /* Set the current machine's Internet number to ID.
995 This call is restricted to the super-user. */
996 extern int sethostid (long int __id
) __THROW __wur
;
999 #if defined __UCLIBC_BSD_SPECIFIC__ || defined _LIBC
1000 /* Get and set the NIS (aka YP) domain name, if any.
1001 Called just like `gethostname' and `sethostname'.
1002 The NIS domain name is usually the empty string when not using NIS. */
1003 extern int getdomainname (char *__name
, size_t __len
)
1004 __THROW
__nonnull ((1)) __wur
;
1005 libc_hidden_proto(getdomainname
)
1007 #if defined __UCLIBC_BSD_SPECIFIC__
1008 extern int setdomainname (const char *__name
, size_t __len
)
1009 __THROW
__nonnull ((1)) __wur
;
1013 #if defined __UCLIBC_LINUX_SPECIFIC__
1014 /* Revoke access permissions to all processes currently communicating
1015 with the control terminal, and then send a SIGHUP signal to the process
1016 group of the control terminal. */
1017 extern int vhangup (void) __THROW
;
1021 /* Revoke the access of all descriptors currently open on FILE. */
1022 extern int revoke (const char *__file
) __THROW
__nonnull ((1)) __wur
;
1025 /* Enable statistical profiling, writing samples of the PC into at most
1026 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
1027 is enabled, the system examines the user PC and increments
1028 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero,
1029 disable profiling. Returns zero on success, -1 on error. */
1030 extern int profil (unsigned short int *__sample_buffer
, size_t __size
,
1031 size_t __offset
, unsigned int __scale
)
1032 __THROW
__nonnull ((1));
1036 /* Turn accounting on if NAME is an existing file. The system will then write
1037 a record for each process as it terminates, to this file. If NAME is NULL,
1038 turn accounting off. This call is restricted to the super-user. */
1039 extern int acct (const char *__name
) __THROW
;
1042 /* Successive calls return the shells listed in `/etc/shells'. */
1043 extern char *getusershell (void) __THROW
;
1044 extern void endusershell (void) __THROW
; /* Discard cached info. */
1045 libc_hidden_proto(endusershell
)
1046 extern void setusershell (void) __THROW
; /* Rewind and re-read the file. */
1047 libc_hidden_proto(setusershell
)
1050 /* Put the program in the background, and dissociate from the controlling
1051 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero,
1052 redirects stdin, stdout, and stderr to /dev/null. */
1053 extern int daemon (int __nochdir
, int __noclose
) __THROW __wur
;
1054 #endif /* Use BSD || X/Open. */
1057 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
1058 /* Make PATH be the root directory (the starting point for absolute paths).
1059 This call is restricted to the super-user. */
1060 extern int chroot (const char *__path
) __THROW
__nonnull ((1)) __wur
;
1062 /* Prompt with PROMPT and read a string from the terminal without echoing.
1063 Uses /dev/tty if possible; otherwise stderr and stdin. */
1064 extern char *getpass (const char *__prompt
) __nonnull ((1));
1065 #endif /* Use BSD || X/Open. */
1068 #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K
1069 /* Make all changes done to FD actually appear on disk.
1071 This function is a cancellation point and therefore not marked with
1073 extern int fsync (int __fd
);
1074 #endif /* Use BSD || X/Open || Unix98. */
1076 #if defined __USE_GNU
1077 /* Make all changes done to all files on the file system associated
1078 * with FD actually appear on disk. */
1079 extern int syncfs (int __fd
) __THROW
;
1082 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
1084 /* Return identifier for the current host. */
1085 extern long int gethostid (void);
1087 /* Make all changes done to all files actually appear on disk. */
1088 extern void sync (void) __THROW
;
1091 /* Return the number of bytes in a page. This is the system's page size,
1092 which is not necessarily the same as the hardware page size. */
1093 extern int getpagesize (void) __THROW
__attribute__ ((__const__
));
1094 libc_hidden_proto(getpagesize
)
1097 /* Return the maximum number of file descriptors
1098 the current process could possibly have. */
1099 extern int getdtablesize (void) __THROW
;
1100 libc_hidden_proto(getdtablesize
)
1103 /* Truncate FILE to LENGTH bytes. */
1104 # ifndef __USE_FILE_OFFSET64
1105 extern int truncate (const char *__file
, __off_t __length
)
1106 __THROW
__nonnull ((1)) __wur
;
1107 libc_hidden_proto(truncate
)
1109 # ifdef __REDIRECT_NTH
1110 extern int __REDIRECT_NTH (truncate
,
1111 (const char *__file
, __off64_t __length
),
1112 truncate64
) __nonnull ((1)) __wur
;
1114 # define truncate truncate64
1117 # ifdef __USE_LARGEFILE64
1118 extern int truncate64 (const char *__file
, __off64_t __length
)
1119 __THROW
__nonnull ((1)) __wur
;
1120 libc_hidden_proto(truncate64
)
1123 #endif /* Use BSD || X/Open Unix. */
1125 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
1127 /* Truncate the file FD is open on to LENGTH bytes. */
1128 # ifndef __USE_FILE_OFFSET64
1129 extern int ftruncate (int __fd
, __off_t __length
) __THROW __wur
;
1130 libc_hidden_proto(ftruncate
)
1132 # ifdef __REDIRECT_NTH
1133 extern int __REDIRECT_NTH (ftruncate
, (int __fd
, __off64_t __length
),
1136 # define ftruncate ftruncate64
1139 # ifdef __USE_LARGEFILE64
1140 extern int ftruncate64 (int __fd
, __off64_t __length
) __THROW __wur
;
1141 libc_hidden_proto(ftruncate64
)
1144 #endif /* Use BSD || X/Open Unix || POSIX 2003. */
1147 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
1149 /* Set the end of accessible data space (aka "the break") to ADDR.
1150 Returns zero on success and -1 for errors (with errno set). */
1151 extern int brk (void *__addr
) __THROW __wur
;
1152 libc_hidden_proto(brk
)
1154 /* Increase or decrease the end of accessible data space by DELTA bytes.
1155 If successful, returns the address the previous end of data space
1156 (i.e. the beginning of the new space, if DELTA > 0);
1157 returns (void *) -1 for errors (with errno set). */
1158 extern void *sbrk (intptr_t __delta
) __THROW
;
1159 libc_hidden_proto(sbrk
)
1164 /* Invoke `system call' number SYSNO, passing it the remaining arguments.
1165 This is completely system-dependent, and not often useful.
1167 In Unix, `syscall' sets `errno' for all errors and most calls return -1
1168 for errors; in many systems you cannot pass arguments or get return
1169 values for all system calls (`pipe', `fork', and `getppid' typically
1172 In Mach, all system calls take normal arguments and always return an
1173 error code (zero for success). */
1174 extern long int syscall (long int __sysno
, ...) __THROW
;
1176 #endif /* Use misc. */
1178 /* Are we in a secure process environment or are we dealing with setuid
1179 * stuff? This value is returned by issetugid().
1181 extern int _pe_secure
;
1182 libc_hidden_proto(_pe_secure
)
1185 /* issetugid() returns 1 if the process environment or memory address space
1186 is considered tainted, and returns 0 otherwise. This happens, for example,
1187 when a process's privileges are elevated by the setuid or setgid flags on
1188 an executable belonging to root.
1190 extern int issetugid(void);
1193 #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK
1194 /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both
1195 files consistent. Some systems have them there and some here, and some
1196 software depends on the macros being defined without including both. */
1198 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
1199 LEN is always relative to the current file position.
1200 The CMD argument is one of the following.
1202 This function is a cancellation point and therefore not marked with
1205 # define F_ULOCK 0 /* Unlock a previously locked region. */
1206 # define F_LOCK 1 /* Lock a region for exclusive use. */
1207 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
1208 # define F_TEST 3 /* Test a region for other processes locks. */
1210 # ifndef __USE_FILE_OFFSET64
1211 extern int lockf (int __fd
, int __cmd
, __off_t __len
) __wur
;
1212 libc_hidden_proto(lockf
)
1215 extern int __REDIRECT (lockf
, (int __fd
, int __cmd
, __off64_t __len
),
1218 # define lockf lockf64
1221 # ifdef __USE_LARGEFILE64
1222 extern int lockf64 (int __fd
, int __cmd
, __off64_t __len
) __wur
;
1224 #endif /* Use misc and F_LOCK not already defined. */
1229 /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno'
1232 # define TEMP_FAILURE_RETRY(expression) \
1234 ({ long int __result; \
1235 do __result = (long int) (expression); \
1236 while (__result == -1L && errno == EINTR); \
1240 #if (defined __USE_POSIX199309 || defined __USE_UNIX98) \
1241 && defined __UCLIBC_HAS_REALTIME__
1242 /* Synchronize at least the data part of a file with the underlying
1244 extern int fdatasync (int __fildes
);
1245 #endif /* Use POSIX199309 */
1248 /* XPG4.2 specifies that prototypes for the encryption functions must
1251 # if defined __UCLIBC_HAS_CRYPT__
1252 /* Encrypt at most 8 characters from KEY using salt to perturb DES. */
1253 extern char *crypt (const char *__key
, const char *__salt
)
1254 __THROW
__nonnull ((1, 2));
1256 /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt
1258 extern void encrypt (char *__block
, int __edflag
) __THROW
__nonnull ((1));
1259 # endif /* __UCLIBC_HAS_CRYPT__ */
1262 /* Swab pairs bytes in the first N bytes of the area pointed to by
1263 FROM and copy the result to TO. The value of TO must not be in the
1264 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM
1265 is without partner. */
1266 extern void swab (const void *__restrict __from
, void *__restrict __to
,
1267 ssize_t __n
) __THROW
__nonnull ((1, 2));
1271 /* The Single Unix specification demands this prototype to be here.
1272 It is also found in <stdio.h>. */
1273 #if defined __USE_XOPEN && !defined __USE_XOPEN2K
1274 /* Return the name of the controlling terminal. */
1275 extern char *ctermid (char *__s
) __THROW
;
1279 /* Define some macros helping to catch buffer overflows. */
1280 #if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline
1281 # include <bits/unistd.h>
1288 #ifndef smallint_type /* if arch didn't override it in bits/wordsize.h */
1289 #define smallint_type int
1291 typedef signed smallint_type smallint
;
1292 typedef unsigned smallint_type smalluint
;
1293 extern size_t __pagesize attribute_hidden
;
1297 #endif /* unistd.h */