1/* Copyright (C) 1991-2002,2003,2004,2005,2006 Free Software Foundation, Inc. 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 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. 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 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, write to the Free 16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 17 02111-1307 USA. */ 18 19/* 20 * POSIX Standard: 2.10 Symbolic Constants <unistd.h> 21 */ 22 23#ifndef _UNISTD_H 24#define _UNISTD_H 1 25 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 33/* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */ 34#define _POSIX_VERSION 200112L 35 36/* These are not #ifdef __USE_POSIX2 because they are 37 in the theoretically application-owned namespace. */ 38 39/* The utilities on GNU systems also correspond to this version. */ 40#define _POSIX2_VERSION 200112L 41 42/* If defined, the implementation supports the 43 C Language Bindings Option. */ 44#define _POSIX2_C_BIND 200112L 45 46/* If defined, the implementation supports the 47 C Language Development Utilities Option. */ 48#define _POSIX2_C_DEV 200112L 49 50/* If defined, the implementation supports the 51 Software Development Utilities Option. */ 52#define _POSIX2_SW_DEV 200112L 53 54#if 0 /* uClibc does not provide the utility */ 55/* If defined, the implementation supports the 56 creation of locales with the localedef utility. */ 57#define _POSIX2_LOCALEDEF 200112L 58#endif 59 60/* X/Open version number to which the library conforms. It is selectable. */ 61#ifdef __USE_UNIX98 62# define _XOPEN_VERSION 500 63#else 64# define _XOPEN_VERSION 4 65#endif 66 67/* Commands and utilities from XPG4 are available. */ 68#define _XOPEN_XCU_VERSION 4 69 70/* We are compatible with the old published standards as well. */ 71#define _XOPEN_XPG2 1 72#define _XOPEN_XPG3 1 73#define _XOPEN_XPG4 1 74 75/* The X/Open Unix extensions are available. */ 76#define _XOPEN_UNIX 1 77 78/* Encryption is present. */ 79#define _XOPEN_CRYPT 1 80 81/* The enhanced internationalization capabilities according to XPG4.2 82 are present. */ 83#define _XOPEN_ENH_I18N 1 84 85/* The legacy interfaces are also available. */ 86#define _XOPEN_LEGACY 1 87 88 89/* Get values of POSIX options: 90 91 If these symbols are defined, the corresponding features are 92 always available. If not, they may be available sometimes. 93 The current values can be obtained with `sysconf'. 94 95 _POSIX_JOB_CONTROL Job control is supported. 96 _POSIX_SAVED_IDS Processes have a saved set-user-ID 97 and a saved set-group-ID. 98 _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. 99 _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. 100 _POSIX_TIMERS POSIX.4 clocks and timers are supported. 101 _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. 102 _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. 103 _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. 104 _POSIX_FSYNC The fsync function is present. 105 _POSIX_MAPPED_FILES Mapping of files to memory is supported. 106 _POSIX_MEMLOCK Locking of all memory is supported. 107 _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. 108 _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. 109 _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. 110 _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. 111 _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. 112 _POSIX_THREADS POSIX.1c pthreads are supported. 113 _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported. 114 _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported. 115 _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported. 116 _POSIX_THREAD_PRIORITY_SCHEDULING 117 POSIX.1c thread execution scheduling supported. 118 _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported. 119 _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported. 120 _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported. 121 _POSIX_PII Protocol-independent interfaces are supported. 122 _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. 123 _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. 124 _POSIX_PII_INTERNET Internet family of protocols supported. 125 _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. 126 _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. 127 _POSIX_PII_OSI ISO/OSI family of protocols supported. 128 _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. 129 _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. 130 _POSIX_POLL Implementation supports `poll' function. 131 _POSIX_SELECT Implementation supports `select' and `pselect'. 132 133 _XOPEN_REALTIME X/Open realtime support is available. 134 _XOPEN_REALTIME_THREADS X/Open realtime thread support is available. 135 _XOPEN_SHM Shared memory interface according to XPG4.2. 136 137 _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit 138 int, long, pointer, and off_t types. 139 _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit 140 int, long, and pointer and off_t with at least 141 64 bits. 142 _XBS5_LP64_OFF64 Implementation provides environment with 32-bit 143 int, and 64-bit long, pointer, and off_t types. 144 _XBS5_LPBIG_OFFBIG Implementation provides environment with at 145 least 32 bits int and long, pointer, and off_t 146 with at least 64 bits. 147 148 If any of these symbols is defined as -1, the corresponding option is not 149 true for any file. If any is defined as other than -1, the corresponding 150 option is true for all files. If a symbol is not defined at all, the value 151 for a specific file can be obtained from `pathconf' and `fpathconf'. 152 153 _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change 154 the owner of a file. `chown' can only be used 155 to change the group ID of a file to a group of 156 which the calling process is a member. 157 _POSIX_NO_TRUNC Pathname components longer than 158 NAME_MAX generate an error. 159 _POSIX_VDISABLE If defined, if the value of an element of the 160 `c_cc' member of `struct termios' is 161 _POSIX_VDISABLE, no character will have the 162 effect associated with that element. 163 _POSIX_SYNC_IO Synchronous I/O may be performed. 164 _POSIX_ASYNC_IO Asynchronous I/O may be performed. 165 _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. 166 167 Support for the Large File Support interface is not generally available. 168 If it is available the following constants are defined to one. 169 _LFS64_LARGEFILE Low-level I/O supports large files. 170 _LFS64_STDIO Standard I/O supports large files. 171 */ 172 173#include <bits/posix_opt.h> 174 175/* Get the environment definitions from Unix98. */ 176#ifdef __USE_UNIX98 177# include <bits/environments.h> 178#endif 179 180/* Standard file descriptors. */ 181#define STDIN_FILENO 0 /* Standard input. */ 182#define STDOUT_FILENO 1 /* Standard output. */ 183#define STDERR_FILENO 2 /* Standard error output. */ 184 185 186/* All functions that are not declared anywhere else. */ 187 188#include <bits/types.h> 189 190#ifndef __ssize_t_defined 191typedef __ssize_t ssize_t; 192# define __ssize_t_defined 193#endif 194 195#define __need_size_t 196#define __need_NULL 197#include <stddef.h> 198 199#if defined __USE_XOPEN || defined __USE_XOPEN2K 200/* The Single Unix specification says that some more types are 201 available here. */ 202# ifndef __gid_t_defined 203typedef __gid_t gid_t; 204# define __gid_t_defined 205# endif 206 207# ifndef __uid_t_defined 208typedef __uid_t uid_t; 209# define __uid_t_defined 210# endif 211 212# ifndef __off_t_defined 213# ifndef __USE_FILE_OFFSET64 214typedef __off_t off_t; 215# else 216typedef __off64_t off_t; 217# endif 218# define __off_t_defined 219# endif 220# if defined __USE_LARGEFILE64 && !defined __off64_t_defined 221typedef __off64_t off64_t; 222# define __off64_t_defined 223# endif 224 225# ifndef __useconds_t_defined 226typedef __useconds_t useconds_t; 227# define __useconds_t_defined 228# endif 229 230# ifndef __pid_t_defined 231typedef __pid_t pid_t; 232# define __pid_t_defined 233# endif 234#endif /* X/Open */ 235 236#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED 237# ifndef __intptr_t_defined 238typedef __intptr_t intptr_t; 239# define __intptr_t_defined 240# endif 241#endif 242 243#if defined __USE_BSD || defined __USE_XOPEN 244# ifndef __socklen_t_defined 245typedef __socklen_t socklen_t; 246# define __socklen_t_defined 247# endif 248#endif 249 250/* Values for the second argument to access. 251 These may be OR'd together. */ 252#define R_OK 4 /* Test for read permission. */ 253#define W_OK 2 /* Test for write permission. */ 254#define X_OK 1 /* Test for execute permission. */ 255#define F_OK 0 /* Test for existence. */ 256 257/* Test for access to NAME using the real UID and real GID. */ 258extern int access (__const char *__name, int __type) __THROW __nonnull ((1)); 259 260#if 0 /*def __USE_GNU*/ 261/* Test for access to NAME using the effective UID and GID 262 (as normal file operations use). */ 263extern int euidaccess (__const char *__name, int __type) 264 __THROW __nonnull ((1)); 265 266/* An alias for `euidaccess', used by some other systems. */ 267extern int eaccess (__const char *__name, int __type) 268 __THROW __nonnull ((1)); 269#endif 270 271#ifdef __USE_ATFILE 272/* Test for access to FILE relative to the directory FD is open on. 273 If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess', 274 otherwise use real IDs like `access'. */ 275extern int faccessat (int __fd, __const char *__file, int __type, int __flag) 276 __THROW __nonnull ((2)) __wur; 277#endif /* Use GNU. */ 278 279 280/* Values for the WHENCE argument to lseek. */ 281#ifndef _STDIO_H /* <stdio.h> has the same definitions. */ 282# define SEEK_SET 0 /* Seek from beginning of file. */ 283# define SEEK_CUR 1 /* Seek from current position. */ 284# define SEEK_END 2 /* Seek from end of file. */ 285#endif 286 287#if defined __USE_BSD && !defined L_SET 288/* Old BSD names for the same constants; just for compatibility. */ 289# define L_SET SEEK_SET 290# define L_INCR SEEK_CUR 291# define L_XTND SEEK_END 292#endif 293 294 295/* Move FD's file position to OFFSET bytes from the 296 beginning of the file (if WHENCE is SEEK_SET), 297 the current position (if WHENCE is SEEK_CUR), 298 or the end of the file (if WHENCE is SEEK_END). 299 Return the new file position. */ 300#ifndef __USE_FILE_OFFSET64 301extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW; 302#else 303# ifdef __REDIRECT_NTH 304extern __off64_t __REDIRECT_NTH (lseek, 305 (int __fd, __off64_t __offset, int __whence), 306 lseek64); 307# else 308# define lseek lseek64 309# endif 310#endif 311#ifdef __USE_LARGEFILE64 312extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) 313 __THROW; 314#endif 315 316/* Close the file descriptor FD. 317 318 This function is a cancellation point and therefore not marked with 319 __THROW. */ 320extern int close (int __fd); 321 322/* Read NBYTES into BUF from FD. Return the 323 number read, -1 for errors or 0 for EOF. 324 325 This function is a cancellation point and therefore not marked with 326 __THROW. */ 327extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur; 328 329/* Write N bytes of BUF to FD. Return the number written, or -1. 330 331 This function is a cancellation point and therefore not marked with 332 __THROW. */ 333extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur; 334 335#ifdef __USE_UNIX98 336# ifndef __USE_FILE_OFFSET64 337/* Read NBYTES into BUF from FD at the given position OFFSET without 338 changing the file pointer. Return the number read, -1 for errors 339 or 0 for EOF. 340 341 This function is a cancellation point and therefore not marked with 342 __THROW. */ 343extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, 344 __off_t __offset) __wur; 345 346/* Write N bytes of BUF to FD at the given position OFFSET without 347 changing the file pointer. Return the number written, or -1. 348 349 This function is a cancellation point and therefore not marked with 350 __THROW. */ 351extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n, 352 __off_t __offset) __wur; 353# else 354# ifdef __REDIRECT 355extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes, 356 __off64_t __offset), 357 pread64) __wur; 358extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf, 359 size_t __nbytes, __off64_t __offset), 360 pwrite64) __wur; 361# else 362# define pread pread64 363# define pwrite pwrite64 364# endif 365# endif 366 367# ifdef __USE_LARGEFILE64 368/* Read NBYTES into BUF from FD at the given position OFFSET without 369 changing the file pointer. Return the number read, -1 for errors 370 or 0 for EOF. */ 371extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes, 372 __off64_t __offset) __wur; 373/* Write N bytes of BUF to FD at the given position OFFSET without 374 changing the file pointer. Return the number written, or -1. */ 375extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n, 376 __off64_t __offset) __wur; 377# endif 378#endif 379 380/* Create a one-way communication channel (pipe). 381 If successful, two file descriptors are stored in PIPEDES; 382 bytes written on PIPEDES[1] can be read from PIPEDES[0]. 383 Returns 0 if successful, -1 if not. */ 384extern int pipe (int __pipedes[2]) __THROW __wur; 385 386#if defined __UCLIBC_LINUX_SPECIFIC__ && defined __USE_GNU 387/* Same as pipe but apply flags passed in FLAGS to the new file 388 descriptors. */ 389extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur; 390#endif 391 392/* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. 393 If SECONDS is zero, any currently scheduled alarm will be cancelled. 394 The function returns the number of seconds remaining until the last 395 alarm scheduled would have signaled, or zero if there wasn't one. 396 There is no return value to indicate an error, but you can set `errno' 397 to 0 and check its value after calling `alarm', and this might tell you. 398 The signal may come late due to processor scheduling. */ 399extern unsigned int alarm (unsigned int __seconds) __THROW; 400 401/* Make the process sleep for SECONDS seconds, or until a signal arrives 402 and is not ignored. The function returns the number of seconds less 403 than SECONDS which it actually slept (thus zero if it slept the full time). 404 If a signal handler does a `longjmp' or modifies the handling of the 405 SIGALRM signal while inside `sleep' call, the handling of the SIGALRM 406 signal afterwards is undefined. There is no return value to indicate 407 error, but if `sleep' returns SECONDS, it probably didn't work. 408 409 This function is a cancellation point and therefore not marked with 410 __THROW. */ 411extern unsigned int sleep (unsigned int __seconds); 412 413#if (defined __USE_BSD || defined __USE_XOPEN_EXTENDED) \ 414 && defined __UCLIBC_SUSV3_LEGACY__ 415/* Set an alarm to go off (generating a SIGALRM signal) in VALUE 416 microseconds. If INTERVAL is nonzero, when the alarm goes off, the 417 timer is reset to go off every INTERVAL microseconds thereafter. 418 Returns the number of microseconds remaining before the alarm. */ 419extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval) 420 __THROW; 421 422/* Sleep USECONDS microseconds, or until a signal arrives that is not blocked 423 or ignored. 424 425 This function is a cancellation point and therefore not marked with 426 __THROW. */ 427extern int usleep (__useconds_t __useconds); 428#endif 429 430 431/* Suspend the process until a signal arrives. 432 This always returns -1 and sets `errno' to EINTR. 433 434 This function is a cancellation point and therefore not marked with 435 __THROW. */ 436extern int pause (void); 437 438 439/* Change the owner and group of FILE. */ 440extern int chown (__const char *__file, __uid_t __owner, __gid_t __group) 441 __THROW __nonnull ((1)) __wur; 442 443#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 444/* Change the owner and group of the file that FD is open on. */ 445extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur; 446 447 448/* Change owner and group of FILE, if it is a symbolic 449 link the ownership of the symbolic link is changed. */ 450extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group) 451 __THROW __nonnull ((1)) __wur; 452 453#endif /* Use BSD || X/Open Unix. */ 454 455#ifdef __USE_ATFILE 456/* Change the owner and group of FILE relative to the directory FD is open 457 on. */ 458extern int fchownat (int __fd, __const char *__file, __uid_t __owner, 459 __gid_t __group, int __flag) 460 __THROW __nonnull ((2)) __wur; 461#endif /* Use GNU. */ 462 463/* Change the process's working directory to PATH. */ 464extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur; 465 466#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 467/* Change the process's working directory to the one FD is open on. */ 468extern int fchdir (int __fd) __THROW __wur; 469#endif 470 471/* Get the pathname of the current working directory, 472 and put it in SIZE bytes of BUF. Returns NULL if the 473 directory couldn't be determined or SIZE was too small. 474 If successful, returns BUF. In GNU, if BUF is NULL, 475 an array is allocated with `malloc'; the array is SIZE 476 bytes long, unless SIZE == 0, in which case it is as 477 big as necessary. */ 478extern char *getcwd (char *__buf, size_t __size) __THROW __wur; 479 480#ifdef __USE_GNU 481/* Return a malloc'd string containing the current directory name. 482 If the environment variable `PWD' is set, and its value is correct, 483 that value is used. */ 484extern char *get_current_dir_name (void) __THROW; 485#endif 486 487#if 0 /*defined __USE_BSD || defined __USE_XOPEN_EXTENDED*/ 488/* Put the absolute pathname of the current working directory in BUF. 489 If successful, return BUF. If not, put an error message in 490 BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ 491extern char *getwd (char *__buf) 492 __THROW __nonnull ((1)) __attribute_deprecated__ __wur; 493#endif 494 495 496/* Duplicate FD, returning a new file descriptor on the same file. */ 497extern int dup (int __fd) __THROW __wur; 498 499/* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ 500extern int dup2 (int __fd, int __fd2) __THROW; 501 502/* NULL-terminated array of "NAME=VALUE" environment variables. */ 503extern char **__environ; 504#ifdef __USE_GNU 505extern char **environ; 506#endif 507 508 509/* Replace the current process, executing PATH with arguments ARGV and 510 environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ 511extern int execve (__const char *__path, char *__const __argv[], 512 char *__const __envp[]) __THROW __nonnull ((1)); 513 514#if 0 /*def __USE_GNU*/ 515/* Execute the file FD refers to, overlaying the running program image. 516 ARGV and ENVP are passed to the new program, as for `execve'. */ 517extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[]) 518 __THROW; 519#endif 520 521 522/* Execute PATH with arguments ARGV and environment from `environ'. */ 523extern int execv (__const char *__path, char *__const __argv[]) 524 __THROW __nonnull ((1)); 525 526/* Execute PATH with all arguments after PATH until a NULL pointer, 527 and the argument after that for environment. */ 528extern int execle (__const char *__path, __const char *__arg, ...) 529 __THROW __nonnull ((1)); 530 531/* Execute PATH with all arguments after PATH until 532 a NULL pointer and environment from `environ'. */ 533extern int execl (__const char *__path, __const char *__arg, ...) 534 __THROW __nonnull ((1)); 535 536/* Execute FILE, searching in the `PATH' environment variable if it contains 537 no slashes, with arguments ARGV and environment from `environ'. */ 538extern int execvp (__const char *__file, char *__const __argv[]) 539 __THROW __nonnull ((1)); 540 541/* Execute FILE, searching in the `PATH' environment variable if 542 it contains no slashes, with all arguments after FILE until a 543 NULL pointer and environment from `environ'. */ 544extern int execlp (__const char *__file, __const char *__arg, ...) 545 __THROW __nonnull ((1)); 546 547 548#if defined __USE_MISC || defined __USE_XOPEN 549/* Add INC to priority of the current process. */ 550extern int nice (int __inc) __THROW __wur; 551#endif 552 553 554/* Terminate program execution with the low-order 8 bits of STATUS. */ 555extern void _exit (int __status) __attribute__ ((__noreturn__)); 556 557 558/* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; 559 the `_SC_*' symbols for the NAME argument to `sysconf'; 560 and the `_CS_*' symbols for the NAME argument to `confstr'. */ 561#include <bits/confname.h> 562 563/* Get file-specific configuration information about PATH. */ 564extern long int pathconf (__const char *__path, int __name) 565 __THROW __nonnull ((1)); 566 567/* Get file-specific configuration about descriptor FD. */ 568extern long int fpathconf (int __fd, int __name) __THROW; 569 570/* Get the value of the system variable NAME. */ 571extern long int sysconf (int __name) __THROW; 572 573#ifdef __USE_POSIX2 574/* Get the value of the string-valued system variable NAME. */ 575extern size_t confstr (int __name, char *__buf, size_t __len) __THROW; 576#endif 577 578 579/* Get the process ID of the calling process. */ 580extern __pid_t getpid (void) __THROW; 581 582/* Get the process ID of the calling process's parent. */ 583extern __pid_t getppid (void) __THROW; 584 585/* Get the process group ID of the calling process. 586 This function is different on old BSD. */ 587#ifndef __FAVOR_BSD 588extern __pid_t getpgrp (void) __THROW; 589#else 590# ifdef __REDIRECT_NTH 591extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid); 592# else 593# define getpgrp __getpgid 594# endif 595#endif 596 597/* Get the process group ID of process PID. */ 598extern __pid_t __getpgid (__pid_t __pid) __THROW; 599#ifdef __USE_XOPEN_EXTENDED 600extern __pid_t getpgid (__pid_t __pid) __THROW; 601#endif 602 603 604/* Set the process group ID of the process matching PID to PGID. 605 If PID is zero, the current process's process group ID is set. 606 If PGID is zero, the process ID of the process is used. */ 607extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW; 608 609#if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED 610/* Both System V and BSD have `setpgrp' functions, but with different 611 calling conventions. The BSD function is the same as POSIX.1 `setpgid' 612 (above). The System V function takes no arguments and puts the calling 613 process in its on group like `setpgid (0, 0)'. 614 615 New programs should always use `setpgid' instead. 616 617 The default in GNU is to provide the System V function. The BSD 618 function is available under -D_BSD_SOURCE. */ 619 620# ifndef __FAVOR_BSD 621 622/* Set the process group ID of the calling process to its own PID. 623 This is exactly the same as `setpgid (0, 0)'. */ 624extern int setpgrp (void) __THROW; 625 626# else 627 628/* Another name for `setpgid' (above). */ 629# ifdef __REDIRECT_NTH 630extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid); 631# else 632# define setpgrp setpgid 633# endif 634 635# endif /* Favor BSD. */ 636#endif /* Use SVID or BSD. */ 637 638/* Create a new session with the calling process as its leader. 639 The process group IDs of the session and the calling process 640 are set to the process ID of the calling process, which is returned. */ 641extern __pid_t setsid (void) __THROW; 642 643#ifdef __USE_XOPEN_EXTENDED 644/* Return the session ID of the given process. */ 645extern __pid_t getsid (__pid_t __pid) __THROW; 646#endif 647 648/* Get the real user ID of the calling process. */ 649extern __uid_t getuid (void) __THROW; 650 651/* Get the effective user ID of the calling process. */ 652extern __uid_t geteuid (void) __THROW; 653 654/* Get the real group ID of the calling process. */ 655extern __gid_t getgid (void) __THROW; 656 657/* Get the effective group ID of the calling process. */ 658extern __gid_t getegid (void) __THROW; 659 660/* If SIZE is zero, return the number of supplementary groups 661 the calling process is in. Otherwise, fill in the group IDs 662 of its supplementary groups in LIST and return the number written. */ 663extern int getgroups (int __size, __gid_t __list[]) __THROW __wur; 664 665#if 0 /*def __USE_GNU*/ 666/* Return nonzero iff the calling process is in group GID. */ 667extern int group_member (__gid_t __gid) __THROW; 668#endif 669 670/* Set the user ID of the calling process to UID. 671 If the calling process is the super-user, set the real 672 and effective user IDs, and the saved set-user-ID to UID; 673 if not, the effective user ID is set to UID. */ 674extern int setuid (__uid_t __uid) __THROW; 675 676#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 677/* Set the real user ID of the calling process to RUID, 678 and the effective user ID of the calling process to EUID. */ 679extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW; 680#endif 681 682#if defined __USE_BSD || defined __USE_XOPEN2K 683/* Set the effective user ID of the calling process to UID. */ 684extern int seteuid (__uid_t __uid) __THROW; 685#endif /* Use BSD. */ 686 687/* Set the group ID of the calling process to GID. 688 If the calling process is the super-user, set the real 689 and effective group IDs, and the saved set-group-ID to GID; 690 if not, the effective group ID is set to GID. */ 691extern int setgid (__gid_t __gid) __THROW; 692 693#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 694/* Set the real group ID of the calling process to RGID, 695 and the effective group ID of the calling process to EGID. */ 696extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW; 697#endif 698 699#if defined __USE_BSD || defined __USE_XOPEN2K 700/* Set the effective group ID of the calling process to GID. */ 701extern int setegid (__gid_t __gid) __THROW; 702#endif /* Use BSD. */ 703 704#ifdef __USE_GNU 705/* Fetch the real user ID, effective user ID, and saved-set user ID, 706 of the calling process. */ 707extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid) 708 __THROW; 709 710/* Fetch the real group ID, effective group ID, and saved-set group ID, 711 of the calling process. */ 712extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid) 713 __THROW; 714 715#if defined __UCLIBC_LINUX_SPECIFIC__ 716/* Set the real user ID, effective user ID, and saved-set user ID, 717 of the calling process to RUID, EUID, and SUID, respectively. */ 718extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid) 719 __THROW; 720#endif 721 722/* Set the real group ID, effective group ID, and saved-set group ID, 723 of the calling process to RGID, EGID, and SGID, respectively. */ 724extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid) 725 __THROW; 726#endif 727 728 729#if defined __UCLIBC_HAS_STUBS__ || defined __ARCH_USE_MMU__ 730/* Clone the calling process, creating an exact copy. 731 Return -1 for errors, 0 to the new process, 732 and the process ID of the new process to the old process. */ 733extern __pid_t fork (void) __THROW; 734#endif 735 736#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 737/* Clone the calling process, but without copying the whole address space. 738 The calling process is suspended until the new process exits or is 739 replaced by a call to `execve'. Return -1 for errors, 0 to the new process, 740 and the process ID of the new process to the old process. */ 741extern __pid_t vfork (void) __THROW; 742#endif /* Use BSD. */ 743 744/* Special exit function which only terminates the current thread. */ 745extern void __exit_thread (int val) __attribute__ ((__noreturn__)); 746 747/* Return the pathname of the terminal FD is open on, or NULL on errors. 748 The returned storage is good only until the next call to this function. */ 749extern char *ttyname (int __fd) __THROW; 750 751/* Store at most BUFLEN characters of the pathname of the terminal FD is 752 open on in BUF. Return 0 on success, otherwise an error number. */ 753extern int ttyname_r (int __fd, char *__buf, size_t __buflen) 754 __THROW __nonnull ((2)) __wur; 755 756/* Return 1 if FD is a valid descriptor associated 757 with a terminal, zero if not. */ 758extern int isatty (int __fd) __THROW; 759 760 761#if 0 /*defined __USE_BSD \ 762 || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98)*/ 763/* Return the index into the active-logins file (utmp) for 764 the controlling terminal. */ 765extern int ttyslot (void) __THROW; 766#endif 767 768 769/* Make a link to FROM named TO. */ 770extern int link (__const char *__from, __const char *__to) 771 __THROW __nonnull ((1, 2)) __wur; 772 773#ifdef __USE_ATFILE 774/* Like link but relative paths in TO and FROM are interpreted relative 775 to FROMFD and TOFD respectively. */ 776extern int linkat (int __fromfd, __const char *__from, int __tofd, 777 __const char *__to, int __flags) 778 __THROW __nonnull ((2, 4)) __wur; 779#endif 780 781#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 782/* Make a symbolic link to FROM named TO. */ 783extern int symlink (__const char *__from, __const char *__to) 784 __THROW __nonnull ((1, 2)) __wur; 785 786/* Read the contents of the symbolic link PATH into no more than 787 LEN bytes of BUF. The contents are not null-terminated. 788 Returns the number of characters read, or -1 for errors. */ 789extern ssize_t readlink (__const char *__restrict __path, 790 char *__restrict __buf, size_t __len) 791 __THROW __nonnull ((1, 2)) __wur; 792#endif /* Use BSD. */ 793 794#ifdef __USE_ATFILE 795/* Like symlink but a relative path in TO is interpreted relative to TOFD. */ 796extern int symlinkat (__const char *__from, int __tofd, 797 __const char *__to) __THROW __nonnull ((1, 3)) __wur; 798 799/* Like readlink but a relative PATH is interpreted relative to FD. */ 800extern ssize_t readlinkat (int __fd, __const char *__restrict __path, 801 char *__restrict __buf, size_t __len) 802 __THROW __nonnull ((2, 3)) __wur; 803#endif 804 805/* Remove the link NAME. */ 806extern int unlink (__const char *__name) __THROW __nonnull ((1)); 807 808#ifdef __USE_ATFILE 809/* Remove the link NAME relative to FD. */ 810extern int unlinkat (int __fd, __const char *__name, int __flag) 811 __THROW __nonnull ((2)); 812#endif 813 814/* Remove the directory PATH. */ 815extern int rmdir (__const char *__path) __THROW __nonnull ((1)); 816 817 818/* Return the foreground process group ID of FD. */ 819extern __pid_t tcgetpgrp (int __fd) __THROW; 820 821/* Set the foreground process group ID of FD set PGRP_ID. */ 822extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW; 823 824 825/* Return the login name of the user. 826 827 This function is a possible cancellation points and therefore not 828 marked with __THROW. */ 829extern char *getlogin (void); 830#if defined __USE_REENTRANT || defined __USE_POSIX199506 831/* Return at most NAME_LEN characters of the login name of the user in NAME. 832 If it cannot be determined or some other error occurred, return the error 833 code. Otherwise return 0. 834 835 This function is a possible cancellation points and therefore not 836 marked with __THROW. */ 837extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1)); 838#endif 839 840#if 0 /*def __USE_BSD*/ 841/* Set the login name returned by `getlogin'. */ 842extern int setlogin (__const char *__name) __THROW __nonnull ((1)); 843#endif 844 845 846#ifdef __USE_POSIX2 847/* Get definitions and prototypes for functions to process the 848 arguments in ARGV (ARGC of them, minus the program name) for 849 options given in OPTS. */ 850# define __need_getopt 851/* keep this for uClibc in bits/, we need it when GNU_GETOPT is disabled */ 852# include <bits/getopt.h> 853#endif 854 855 856#if defined __USE_BSD || defined __USE_UNIX98 857/* Put the name of the current host in no more than LEN bytes of NAME. 858 The result is null-terminated if LEN is large enough for the full 859 name and the terminator. */ 860extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1)); 861#endif 862 863 864#if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98) 865/* Set the name of the current host to NAME, which is LEN bytes long. 866 This call is restricted to the super-user. */ 867extern int sethostname (__const char *__name, size_t __len) 868 __THROW __nonnull ((1)) __wur; 869 870/* Set the current machine's Internet number to ID. 871 This call is restricted to the super-user. */ 872extern int sethostid (long int __id) __THROW __wur; 873 874#if defined __UCLIBC_BSD_SPECIFIC__ || defined _LIBC 875/* Get and set the NIS (aka YP) domain name, if any. 876 Called just like `gethostname' and `sethostname'. 877 The NIS domain name is usually the empty string when not using NIS. */ 878extern int getdomainname (char *__name, size_t __len) 879 __THROW __nonnull ((1)) __wur; 880#endif 881#if defined __UCLIBC_BSD_SPECIFIC__ 882extern int setdomainname (__const char *__name, size_t __len) 883 __THROW __nonnull ((1)) __wur; 884#endif 885 886#if defined __UCLIBC_LINUX_SPECIFIC__ 887/* Revoke access permissions to all processes currently communicating 888 with the control terminal, and then send a SIGHUP signal to the process 889 group of the control terminal. */ 890extern int vhangup (void) __THROW; 891#endif 892 893#if 0 894/* Revoke the access of all descriptors currently open on FILE. */ 895extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur; 896 897 898/* Enable statistical profiling, writing samples of the PC into at most 899 SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling 900 is enabled, the system examines the user PC and increments 901 SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, 902 disable profiling. Returns zero on success, -1 on error. */ 903extern int profil (unsigned short int *__sample_buffer, size_t __size, 904 size_t __offset, unsigned int __scale) 905 __THROW __nonnull ((1)); 906#endif 907 908 909/* Turn accounting on if NAME is an existing file. The system will then write 910 a record for each process as it terminates, to this file. If NAME is NULL, 911 turn accounting off. This call is restricted to the super-user. */ 912extern int acct (__const char *__name) __THROW; 913 914 915/* Successive calls return the shells listed in `/etc/shells'. */ 916extern char *getusershell (void) __THROW; 917extern void endusershell (void) __THROW; /* Discard cached info. */ 918extern void setusershell (void) __THROW; /* Rewind and re-read the file. */ 919 920 921/* Put the program in the background, and dissociate from the controlling 922 terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, 923 redirects stdin, stdout, and stderr to /dev/null. */ 924extern int daemon (int __nochdir, int __noclose) __THROW __wur; 925#endif /* Use BSD || X/Open. */ 926 927 928#if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K) 929/* Make PATH be the root directory (the starting point for absolute paths). 930 This call is restricted to the super-user. */ 931extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur; 932 933/* Prompt with PROMPT and read a string from the terminal without echoing. 934 Uses /dev/tty if possible; otherwise stderr and stdin. */ 935extern char *getpass (__const char *__prompt) __nonnull ((1)); 936#endif /* Use BSD || X/Open. */ 937 938 939#if defined __USE_BSD || defined __USE_XOPEN 940/* Make all changes done to FD actually appear on disk. 941 942 This function is a cancellation point and therefore not marked with 943 __THROW. */ 944extern int fsync (int __fd); 945#endif /* Use BSD || X/Open. */ 946 947 948#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 949 950/* Return identifier for the current host. */ 951extern long int gethostid (void); 952 953/* Make all changes done to all files actually appear on disk. */ 954extern void sync (void) __THROW; 955 956 957/* Return the number of bytes in a page. This is the system's page size, 958 which is not necessarily the same as the hardware page size. */ 959extern int getpagesize (void) __THROW __attribute__ ((__const__)); 960 961 962/* Return the maximum number of file descriptors 963 the current process could possibly have. */ 964extern int getdtablesize (void) __THROW; 965 966 967/* Truncate FILE to LENGTH bytes. */ 968# ifndef __USE_FILE_OFFSET64 969extern int truncate (__const char *__file, __off_t __length) 970 __THROW __nonnull ((1)) __wur; 971# else 972# ifdef __REDIRECT_NTH 973extern int __REDIRECT_NTH (truncate, 974 (__const char *__file, __off64_t __length), 975 truncate64) __nonnull ((1)) __wur; 976# else 977# define truncate truncate64 978# endif 979# endif 980# ifdef __USE_LARGEFILE64 981extern int truncate64 (__const char *__file, __off64_t __length) 982 __THROW __nonnull ((1)) __wur; 983# endif 984 985#endif /* Use BSD || X/Open Unix. */ 986 987#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 988 989/* Truncate the file FD is open on to LENGTH bytes. */ 990# ifndef __USE_FILE_OFFSET64 991extern int ftruncate (int __fd, __off_t __length) __THROW __wur; 992# else 993# ifdef __REDIRECT_NTH 994extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length), 995 ftruncate64) __wur; 996# else 997# define ftruncate ftruncate64 998# endif 999# endif 1000# ifdef __USE_LARGEFILE64 1001extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur; 1002# endif 1003 1004#endif /* Use BSD || X/Open Unix || POSIX 2003. */ 1005 1006 1007#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED 1008 1009/* Set the end of accessible data space (aka "the break") to ADDR. 1010 Returns zero on success and -1 for errors (with errno set). */ 1011extern int brk (void *__addr) __THROW __wur; 1012 1013/* Increase or decrease the end of accessible data space by DELTA bytes. 1014 If successful, returns the address the previous end of data space 1015 (i.e. the beginning of the new space, if DELTA > 0); 1016 returns (void *) -1 for errors (with errno set). */ 1017extern void *sbrk (intptr_t __delta) __THROW; 1018#endif 1019 1020 1021#ifdef __USE_MISC 1022/* Invoke `system call' number SYSNO, passing it the remaining arguments. 1023 This is completely system-dependent, and not often useful. 1024 1025 In Unix, `syscall' sets `errno' for all errors and most calls return -1 1026 for errors; in many systems you cannot pass arguments or get return 1027 values for all system calls (`pipe', `fork', and `getppid' typically 1028 among them). 1029 1030 In Mach, all system calls take normal arguments and always return an 1031 error code (zero for success). */ 1032extern long int syscall (long int __sysno, ...) __THROW; 1033 1034#endif /* Use misc. */ 1035 1036 1037#if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK 1038/* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both 1039 files consistent. Some systems have them there and some here, and some 1040 software depends on the macros being defined without including both. */ 1041 1042/* `lockf' is a simpler interface to the locking facilities of `fcntl'. 1043 LEN is always relative to the current file position. 1044 The CMD argument is one of the following. 1045 1046 This function is a cancellation point and therefore not marked with 1047 __THROW. */ 1048 1049# define F_ULOCK 0 /* Unlock a previously locked region. */ 1050# define F_LOCK 1 /* Lock a region for exclusive use. */ 1051# define F_TLOCK 2 /* Test and lock a region for exclusive use. */ 1052# define F_TEST 3 /* Test a region for other processes locks. */ 1053 1054# ifndef __USE_FILE_OFFSET64 1055extern int lockf (int __fd, int __cmd, __off_t __len) __wur; 1056# else 1057# ifdef __REDIRECT 1058extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), 1059 lockf64) __wur; 1060# else 1061# define lockf lockf64 1062# endif 1063# endif 1064# ifdef __USE_LARGEFILE64 1065extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur; 1066# endif 1067#endif /* Use misc and F_LOCK not already defined. */ 1068 1069 1070#ifdef __USE_GNU 1071 1072/* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' 1073 set to EINTR. */ 1074 1075# define TEMP_FAILURE_RETRY(expression) \ 1076 (__extension__ \ 1077 ({ long int __result; \ 1078 do __result = (long int) (expression); \ 1079 while (__result == -1L && errno == EINTR); \ 1080 __result; })) 1081#endif 1082 1083#if (defined __USE_POSIX199309 || defined __USE_UNIX98) \ 1084 && defined __UCLIBC_HAS_REALTIME__ 1085/* Synchronize at least the data part of a file with the underlying 1086 media. */ 1087extern int fdatasync (int __fildes) __THROW; 1088#endif /* Use POSIX199309 */ 1089 1090 1091/* XPG4.2 specifies that prototypes for the encryption functions must 1092 be defined here. */ 1093#ifdef __USE_XOPEN 1094# if defined __UCLIBC_HAS_CRYPT__ 1095/* Encrypt at most 8 characters from KEY using salt to perturb DES. */ 1096extern char *crypt (__const char *__key, __const char *__salt) 1097 __THROW __nonnull ((1, 2)); 1098 1099/* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt 1100 block in place. */ 1101extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1)); 1102# endif /* __UCLIBC_HAS_CRYPT__ */ 1103 1104 1105/* Swab pairs bytes in the first N bytes of the area pointed to by 1106 FROM and copy the result to TO. The value of TO must not be in the 1107 range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM 1108 is without partner. */ 1109extern void swab (__const void *__restrict __from, void *__restrict __to, 1110 ssize_t __n) __THROW __nonnull ((1, 2)); 1111#endif 1112 1113 1114/* The Single Unix specification demands this prototype to be here. 1115 It is also found in <stdio.h>. */ 1116#ifdef __USE_XOPEN 1117/* Return the name of the controlling terminal. */ 1118extern char *ctermid (char *__s) __THROW; 1119#endif 1120 1121 1122/* Define some macros helping to catch buffer overflows. */ 1123#if __USE_FORTIFY_LEVEL > 0 && !defined __cplusplus 1124# include <bits/unistd.h> 1125#endif 1126 1127__END_DECLS 1128 1129 1130 1131 1132#endif /* unistd.h */ 1133