Dr Andrew Scott
G7VAV
Senior Lecturer
School of Computing
and Communications
D35 InfoLab21
Lancaster University
Lancaster, LA1 4WA
United Kingdom
School of Computing
and Communications
D35 InfoLab21
Lancaster University
Lancaster, LA1 4WA
United Kingdom
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unistd.h
0001: /* Copyright (C) 1991-2009, 2010, 2011 Free Software Foundation, Inc. 0002: This file is part of the GNU C Library. 0003: 0004: The GNU C Library is free software; you can redistribute it and/or 0005: modify it under the terms of the GNU Lesser General Public 0006: License as published by the Free Software Foundation; either 0007: version 2.1 of the License, or (at your option) any later version. 0008: 0009: The GNU C Library is distributed in the hope that it will be useful, 0010: but WITHOUT ANY WARRANTY; without even the implied warranty of 0011: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 0012: Lesser General Public License for more details. 0013: 0014: You should have received a copy of the GNU Lesser General Public 0015: License along with the GNU C Library; if not, write to the Free 0016: Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 0017: 02111-1307 USA. */ 0018: 0019: /* 0020: * POSIX Standard: 2.10 Symbolic Constants <unistd.h> 0021: */ 0022: 0023: #ifndef _UNISTD_H 0024: #define _UNISTD_H 1 0025: 0026: #include <features.h> 0027: 0028: __BEGIN_DECLS 0029: 0030: /* These may be used to determine what facilities are present at compile time. 0031: Their values can be obtained at run time from `sysconf'. */ 0032: 0033: #ifdef __USE_XOPEN2K8 0034: /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */ 0035: # define _POSIX_VERSION 200809L 0036: #elif defined __USE_XOPEN2K 0037: /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */ 0038: # define _POSIX_VERSION 200112L 0039: #elif defined __USE_POSIX199506 0040: /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */ 0041: # define _POSIX_VERSION 199506L 0042: #elif defined __USE_POSIX199309 0043: /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */ 0044: # define _POSIX_VERSION 199309L 0045: #else 0046: /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */ 0047: # define _POSIX_VERSION 199009L 0048: #endif 0049: 0050: /* These are not #ifdef __USE_POSIX2 because they are 0051: in the theoretically application-owned namespace. */ 0052: 0053: #ifdef __USE_XOPEN2K8 0054: # define __POSIX2_THIS_VERSION 200809L 0055: /* The utilities on GNU systems also correspond to this version. */ 0056: #elif defined __USE_XOPEN2K 0057: /* The utilities on GNU systems also correspond to this version. */ 0058: # define __POSIX2_THIS_VERSION 200112L 0059: #elif defined __USE_POSIX199506 0060: /* The utilities on GNU systems also correspond to this version. */ 0061: # define __POSIX2_THIS_VERSION 199506L 0062: #else 0063: /* The utilities on GNU systems also correspond to this version. */ 0064: # define __POSIX2_THIS_VERSION 199209L 0065: #endif 0066: 0067: /* The utilities on GNU systems also correspond to this version. */ 0068: #define _POSIX2_VERSION __POSIX2_THIS_VERSION 0069: 0070: /* If defined, the implementation supports the 0071: C Language Bindings Option. */ 0072: #define _POSIX2_C_BIND __POSIX2_THIS_VERSION 0073: 0074: /* If defined, the implementation supports the 0075: C Language Development Utilities Option. */ 0076: #define _POSIX2_C_DEV __POSIX2_THIS_VERSION 0077: 0078: /* If defined, the implementation supports the 0079: Software Development Utilities Option. */ 0080: #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION 0081: 0082: /* If defined, the implementation supports the 0083: creation of locales with the localedef utility. */ 0084: #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION 0085: 0086: /* X/Open version number to which the library conforms. It is selectable. */ 0087: #ifdef __USE_XOPEN2K8 0088: # define _XOPEN_VERSION 700 0089: #elif defined __USE_XOPEN2K 0090: # define _XOPEN_VERSION 600 0091: #elif defined __USE_UNIX98 0092: # define _XOPEN_VERSION 500 0093: #else 0094: # define _XOPEN_VERSION 4 0095: #endif 0096: 0097: /* Commands and utilities from XPG4 are available. */ 0098: #define _XOPEN_XCU_VERSION 4 0099: 0100: /* We are compatible with the old published standards as well. */ 0101: #define _XOPEN_XPG2 1 0102: #define _XOPEN_XPG3 1 0103: #define _XOPEN_XPG4 1 0104: 0105: /* The X/Open Unix extensions are available. */ 0106: #define _XOPEN_UNIX 1 0107: 0108: /* Encryption is present. */ 0109: #define _XOPEN_CRYPT 1 0110: 0111: /* The enhanced internationalization capabilities according to XPG4.2 0112: are present. */ 0113: #define _XOPEN_ENH_I18N 1 0114: 0115: /* The legacy interfaces are also available. */ 0116: #define _XOPEN_LEGACY 1 0117: 0118: 0119: /* Get values of POSIX options: 0120: 0121: If these symbols are defined, the corresponding features are 0122: always available. If not, they may be available sometimes. 0123: The current values can be obtained with `sysconf'. 0124: 0125: _POSIX_JOB_CONTROL Job control is supported. 0126: _POSIX_SAVED_IDS Processes have a saved set-user-ID 0127: and a saved set-group-ID. 0128: _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. 0129: _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. 0130: _POSIX_TIMERS POSIX.4 clocks and timers are supported. 0131: _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. 0132: _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. 0133: _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. 0134: _POSIX_FSYNC The fsync function is present. 0135: _POSIX_MAPPED_FILES Mapping of files to memory is supported. 0136: _POSIX_MEMLOCK Locking of all memory is supported. 0137: _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. 0138: _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. 0139: _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. 0140: _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. 0141: _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. 0142: _POSIX_THREADS POSIX.1c pthreads are supported. 0143: _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported. 0144: _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported. 0145: _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported. 0146: _POSIX_THREAD_PRIORITY_SCHEDULING 0147: POSIX.1c thread execution scheduling supported. 0148: _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported. 0149: _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported. 0150: _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported. 0151: _POSIX_PII Protocol-independent interfaces are supported. 0152: _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. 0153: _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. 0154: _POSIX_PII_INTERNET Internet family of protocols supported. 0155: _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. 0156: _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. 0157: _POSIX_PII_OSI ISO/OSI family of protocols supported. 0158: _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. 0159: _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. 0160: _POSIX_POLL Implementation supports `poll' function. 0161: _POSIX_SELECT Implementation supports `select' and `pselect'. 0162: 0163: _XOPEN_REALTIME X/Open realtime support is available. 0164: _XOPEN_REALTIME_THREADS X/Open realtime thread support is available. 0165: _XOPEN_SHM Shared memory interface according to XPG4.2. 0166: 0167: _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit 0168: int, long, pointer, and off_t types. 0169: _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit 0170: int, long, and pointer and off_t with at least 0171: 64 bits. 0172: _XBS5_LP64_OFF64 Implementation provides environment with 32-bit 0173: int, and 64-bit long, pointer, and off_t types. 0174: _XBS5_LPBIG_OFFBIG Implementation provides environment with at 0175: least 32 bits int and long, pointer, and off_t 0176: with at least 64 bits. 0177: 0178: If any of these symbols is defined as -1, the corresponding option is not 0179: true for any file. If any is defined as other than -1, the corresponding 0180: option is true for all files. If a symbol is not defined at all, the value 0181: for a specific file can be obtained from `pathconf' and `fpathconf'. 0182: 0183: _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change 0184: the owner of a file. `chown' can only be used 0185: to change the group ID of a file to a group of 0186: which the calling process is a member. 0187: _POSIX_NO_TRUNC Pathname components longer than 0188: NAME_MAX generate an error. 0189: _POSIX_VDISABLE If defined, if the value of an element of the 0190: `c_cc' member of `struct termios' is 0191: _POSIX_VDISABLE, no character will have the 0192: effect associated with that element. 0193: _POSIX_SYNC_IO Synchronous I/O may be performed. 0194: _POSIX_ASYNC_IO Asynchronous I/O may be performed. 0195: _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. 0196: 0197: Support for the Large File Support interface is not generally available. 0198: If it is available the following constants are defined to one. 0199: _LFS64_LARGEFILE Low-level I/O supports large files. 0200: _LFS64_STDIO Standard I/O supports large files. 0201: */ 0202: 0203: #include <bits/posix_opt.h> 0204: 0205: /* Get the environment definitions from Unix98. */ 0206: #if defined __USE_UNIX98 || defined __USE_XOPEN2K 0207: # include <bits/environments.h> 0208: #endif 0209: 0210: /* Standard file descriptors. */ 0211: #define STDIN_FILENO 0 /* Standard input. */ 0212: #define STDOUT_FILENO 1 /* Standard output. */ 0213: #define STDERR_FILENO 2 /* Standard error output. */ 0214: 0215: 0216: /* All functions that are not declared anywhere else. */ 0217: 0218: #include <bits/types.h> 0219: 0220: #ifndef __ssize_t_defined 0221: typedef __ssize_t ssize_t; 0222: # define __ssize_t_defined 0223: #endif 0224: 0225: #define __need_size_t 0226: #define __need_NULL 0227: #include <stddef.h> 0228: 0229: #if defined __USE_XOPEN || defined __USE_XOPEN2K 0230: /* The Single Unix specification says that some more types are 0231: available here. */ 0232: # ifndef __gid_t_defined 0233: typedef __gid_t gid_t; 0234: # define __gid_t_defined 0235: # endif 0236: 0237: # ifndef __uid_t_defined 0238: typedef __uid_t uid_t; 0239: # define __uid_t_defined 0240: # endif 0241: 0242: # ifndef __off_t_defined 0243: # ifndef __USE_FILE_OFFSET64 0244: typedef __off_t off_t; 0245: # else 0246: typedef __off64_t off_t; 0247: # endif 0248: # define __off_t_defined 0249: # endif 0250: # if defined __USE_LARGEFILE64 && !defined __off64_t_defined 0251: typedef __off64_t off64_t; 0252: # define __off64_t_defined 0253: # endif 0254: 0255: # ifndef __useconds_t_defined 0256: typedef __useconds_t useconds_t; 0257: # define __useconds_t_defined 0258: # endif 0259: 0260: # ifndef __pid_t_defined 0261: typedef __pid_t pid_t; 0262: # define __pid_t_defined 0263: # endif 0264: #endif /* X/Open */ 0265: 0266: #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 0267: # ifndef __intptr_t_defined 0268: typedef __intptr_t intptr_t; 0269: # define __intptr_t_defined 0270: # endif 0271: #endif 0272: 0273: #if defined __USE_BSD || defined __USE_XOPEN 0274: # ifndef __socklen_t_defined 0275: typedef __socklen_t socklen_t; 0276: # define __socklen_t_defined 0277: # endif 0278: #endif 0279: 0280: /* Values for the second argument to access. 0281: These may be OR'd together. */ 0282: #define R_OK 4 /* Test for read permission. */ 0283: #define W_OK 2 /* Test for write permission. */ 0284: #define X_OK 1 /* Test for execute permission. */ 0285: #define F_OK 0 /* Test for existence. */ 0286: 0287: /* Test for access to NAME using the real UID and real GID. */ 0288: extern int access (__const char *__name, int __type) __THROW __nonnull ((1)); 0289: 0290: #ifdef __USE_GNU 0291: /* Test for access to NAME using the effective UID and GID 0292: (as normal file operations use). */ 0293: extern int euidaccess (__const char *__name, int __type) 0294: __THROW __nonnull ((1)); 0295: 0296: /* An alias for `euidaccess', used by some other systems. */ 0297: extern int eaccess (__const char *__name, int __type) 0298: __THROW __nonnull ((1)); 0299: #endif 0300: 0301: #ifdef __USE_ATFILE 0302: /* Test for access to FILE relative to the directory FD is open on. 0303: If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess', 0304: otherwise use real IDs like `access'. */ 0305: extern int faccessat (int __fd, __const char *__file, int __type, int __flag) 0306: __THROW __nonnull ((2)) __wur; 0307: #endif /* Use GNU. */ 0308: 0309: 0310: /* Values for the WHENCE argument to lseek. */ 0311: #ifndef _STDIO_H /* <stdio.h> has the same definitions. */ 0312: # define SEEK_SET 0 /* Seek from beginning of file. */ 0313: # define SEEK_CUR 1 /* Seek from current position. */ 0314: # define SEEK_END 2 /* Seek from end of file. */ 0315: # ifdef __USE_GNU 0316: # define SEEK_DATA 3 /* Seek to next data. */ 0317: # define SEEK_HOLE 4 /* Seek to next hole. */ 0318: # endif 0319: #endif 0320: 0321: #if defined __USE_BSD && !defined L_SET 0322: /* Old BSD names for the same constants; just for compatibility. */ 0323: # define L_SET SEEK_SET 0324: # define L_INCR SEEK_CUR 0325: # define L_XTND SEEK_END 0326: #endif 0327: 0328: 0329: /* Move FD's file position to OFFSET bytes from the 0330: beginning of the file (if WHENCE is SEEK_SET), 0331: the current position (if WHENCE is SEEK_CUR), 0332: or the end of the file (if WHENCE is SEEK_END). 0333: Return the new file position. */ 0334: #ifndef __USE_FILE_OFFSET64 0335: extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW; 0336: #else 0337: # ifdef __REDIRECT_NTH 0338: extern __off64_t __REDIRECT_NTH (lseek, 0339: (int __fd, __off64_t __offset, int __whence), 0340: lseek64); 0341: # else 0342: # define lseek lseek64 0343: # endif 0344: #endif 0345: #ifdef __USE_LARGEFILE64 0346: extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) 0347: __THROW; 0348: #endif 0349: 0350: /* Close the file descriptor FD. 0351: 0352: This function is a cancellation point and therefore not marked with 0353: __THROW. */ 0354: extern int close (int __fd); 0355: 0356: /* Read NBYTES into BUF from FD. Return the 0357: number read, -1 for errors or 0 for EOF. 0358: 0359: This function is a cancellation point and therefore not marked with 0360: __THROW. */ 0361: extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur; 0362: 0363: /* Write N bytes of BUF to FD. Return the number written, or -1. 0364: 0365: This function is a cancellation point and therefore not marked with 0366: __THROW. */ 0367: extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur; 0368: 0369: #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 0370: # ifndef __USE_FILE_OFFSET64 0371: /* Read NBYTES into BUF from FD at the given position OFFSET without 0372: changing the file pointer. Return the number read, -1 for errors 0373: or 0 for EOF. 0374: 0375: This function is a cancellation point and therefore not marked with 0376: __THROW. */ 0377: extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, 0378: __off_t __offset) __wur; 0379: 0380: /* Write N bytes of BUF to FD at the given position OFFSET without 0381: changing the file pointer. Return the number written, or -1. 0382: 0383: This function is a cancellation point and therefore not marked with 0384: __THROW. */ 0385: extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n, 0386: __off_t __offset) __wur; 0387: # else 0388: # ifdef __REDIRECT 0389: extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes, 0390: __off64_t __offset), 0391: pread64) __wur; 0392: extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf, 0393: size_t __nbytes, __off64_t __offset), 0394: pwrite64) __wur; 0395: # else 0396: # define pread pread64 0397: # define pwrite pwrite64 0398: # endif 0399: # endif 0400: 0401: # ifdef __USE_LARGEFILE64 0402: /* Read NBYTES into BUF from FD at the given position OFFSET without 0403: changing the file pointer. Return the number read, -1 for errors 0404: or 0 for EOF. */ 0405: extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes, 0406: __off64_t __offset) __wur; 0407: /* Write N bytes of BUF to FD at the given position OFFSET without 0408: changing the file pointer. Return the number written, or -1. */ 0409: extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n, 0410: __off64_t __offset) __wur; 0411: # endif 0412: #endif 0413: 0414: /* Create a one-way communication channel (pipe). 0415: If successful, two file descriptors are stored in PIPEDES; 0416: bytes written on PIPEDES[1] can be read from PIPEDES[0]. 0417: Returns 0 if successful, -1 if not. */ 0418: extern int pipe (int __pipedes[2]) __THROW __wur; 0419: 0420: #ifdef __USE_GNU 0421: /* Same as pipe but apply flags passed in FLAGS to the new file 0422: descriptors. */ 0423: extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur; 0424: #endif 0425: 0426: /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. 0427: If SECONDS is zero, any currently scheduled alarm will be cancelled. 0428: The function returns the number of seconds remaining until the last 0429: alarm scheduled would have signaled, or zero if there wasn't one. 0430: There is no return value to indicate an error, but you can set `errno' 0431: to 0 and check its value after calling `alarm', and this might tell you. 0432: The signal may come late due to processor scheduling. */ 0433: extern unsigned int alarm (unsigned int __seconds) __THROW; 0434: 0435: /* Make the process sleep for SECONDS seconds, or until a signal arrives 0436: and is not ignored. The function returns the number of seconds less 0437: than SECONDS which it actually slept (thus zero if it slept the full time). 0438: If a signal handler does a `longjmp' or modifies the handling of the 0439: SIGALRM signal while inside `sleep' call, the handling of the SIGALRM 0440: signal afterwards is undefined. There is no return value to indicate 0441: error, but if `sleep' returns SECONDS, it probably didn't work. 0442: 0443: This function is a cancellation point and therefore not marked with 0444: __THROW. */ 0445: extern unsigned int sleep (unsigned int __seconds); 0446: 0447: #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 0448: || defined __USE_BSD 0449: /* Set an alarm to go off (generating a SIGALRM signal) in VALUE 0450: microseconds. If INTERVAL is nonzero, when the alarm goes off, the 0451: timer is reset to go off every INTERVAL microseconds thereafter. 0452: Returns the number of microseconds remaining before the alarm. */ 0453: extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval) 0454: __THROW; 0455: 0456: /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked 0457: or ignored. 0458: 0459: This function is a cancellation point and therefore not marked with 0460: __THROW. */ 0461: extern int usleep (__useconds_t __useconds); 0462: #endif 0463: 0464: 0465: /* Suspend the process until a signal arrives. 0466: This always returns -1 and sets `errno' to EINTR. 0467: 0468: This function is a cancellation point and therefore not marked with 0469: __THROW. */ 0470: extern int pause (void); 0471: 0472: 0473: /* Change the owner and group of FILE. */ 0474: extern int chown (__const char *__file, __uid_t __owner, __gid_t __group) 0475: __THROW __nonnull ((1)) __wur; 0476: 0477: #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 0478: /* Change the owner and group of the file that FD is open on. */ 0479: extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur; 0480: 0481: 0482: /* Change owner and group of FILE, if it is a symbolic 0483: link the ownership of the symbolic link is changed. */ 0484: extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group) 0485: __THROW __nonnull ((1)) __wur; 0486: 0487: #endif /* Use BSD || X/Open Unix. */ 0488: 0489: #ifdef __USE_ATFILE 0490: /* Change the owner and group of FILE relative to the directory FD is open 0491: on. */ 0492: extern int fchownat (int __fd, __const char *__file, __uid_t __owner, 0493: __gid_t __group, int __flag) 0494: __THROW __nonnull ((2)) __wur; 0495: #endif /* Use GNU. */ 0496: 0497: /* Change the process's working directory to PATH. */ 0498: extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur; 0499: 0500: #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 0501: /* Change the process's working directory to the one FD is open on. */ 0502: extern int fchdir (int __fd) __THROW __wur; 0503: #endif 0504: 0505: /* Get the pathname of the current working directory, 0506: and put it in SIZE bytes of BUF. Returns NULL if the 0507: directory couldn't be determined or SIZE was too small. 0508: If successful, returns BUF. In GNU, if BUF is NULL, 0509: an array is allocated with `malloc'; the array is SIZE 0510: bytes long, unless SIZE == 0, in which case it is as 0511: big as necessary. */ 0512: extern char *getcwd (char *__buf, size_t __size) __THROW __wur; 0513: 0514: #ifdef __USE_GNU 0515: /* Return a malloc'd string containing the current directory name. 0516: If the environment variable `PWD' is set, and its value is correct, 0517: that value is used. */ 0518: extern char *get_current_dir_name (void) __THROW; 0519: #endif 0520: 0521: #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 0522: || defined __USE_BSD 0523: /* Put the absolute pathname of the current working directory in BUF. 0524: If successful, return BUF. If not, put an error message in 0525: BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ 0526: extern char *getwd (char *__buf) 0527: __THROW __nonnull ((1)) __attribute_deprecated__ __wur; 0528: #endif 0529: 0530: 0531: /* Duplicate FD, returning a new file descriptor on the same file. */ 0532: extern int dup (int __fd) __THROW __wur; 0533: 0534: /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ 0535: extern int dup2 (int __fd, int __fd2) __THROW; 0536: 0537: #ifdef __USE_GNU 0538: /* Duplicate FD to FD2, closing FD2 and making it open on the same 0539: file while setting flags according to FLAGS. */ 0540: extern int dup3 (int __fd, int __fd2, int __flags) __THROW; 0541: #endif 0542: 0543: /* NULL-terminated array of "NAME=VALUE" environment variables. */ 0544: extern char **__environ; 0545: #ifdef __USE_GNU 0546: extern char **environ; 0547: #endif 0548: 0549: 0550: /* Replace the current process, executing PATH with arguments ARGV and 0551: environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ 0552: extern int execve (__const char *__path, char *__const __argv[], 0553: char *__const __envp[]) __THROW __nonnull ((1, 2)); 0554: 0555: #ifdef __USE_XOPEN2K8 0556: /* Execute the file FD refers to, overlaying the running program image. 0557: ARGV and ENVP are passed to the new program, as for `execve'. */ 0558: extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[]) 0559: __THROW __nonnull ((2)); 0560: #endif 0561: 0562: 0563: /* Execute PATH with arguments ARGV and environment from `environ'. */ 0564: extern int execv (__const char *__path, char *__const __argv[]) 0565: __THROW __nonnull ((1, 2)); 0566: 0567: /* Execute PATH with all arguments after PATH until a NULL pointer, 0568: and the argument after that for environment. */ 0569: extern int execle (__const char *__path, __const char *__arg, ...) 0570: __THROW __nonnull ((1, 2)); 0571: 0572: /* Execute PATH with all arguments after PATH until 0573: a NULL pointer and environment from `environ'. */ 0574: extern int execl (__const char *__path, __const char *__arg, ...) 0575: __THROW __nonnull ((1, 2)); 0576: 0577: /* Execute FILE, searching in the `PATH' environment variable if it contains 0578: no slashes, with arguments ARGV and environment from `environ'. */ 0579: extern int execvp (__const char *__file, char *__const __argv[]) 0580: __THROW __nonnull ((1, 2)); 0581: 0582: /* Execute FILE, searching in the `PATH' environment variable if 0583: it contains no slashes, with all arguments after FILE until a 0584: NULL pointer and environment from `environ'. */ 0585: extern int execlp (__const char *__file, __const char *__arg, ...) 0586: __THROW __nonnull ((1, 2)); 0587: 0588: #ifdef __USE_GNU 0589: /* Execute FILE, searching in the `PATH' environment variable if it contains 0590: no slashes, with arguments ARGV and environment from `environ'. */ 0591: extern int execvpe (__const char *__file, char *__const __argv[], 0592: char *__const __envp[]) 0593: __THROW __nonnull ((1, 2)); 0594: #endif 0595: 0596: 0597: #if defined __USE_MISC || defined __USE_XOPEN 0598: /* Add INC to priority of the current process. */ 0599: extern int nice (int __inc) __THROW __wur; 0600: #endif 0601: 0602: 0603: /* Terminate program execution with the low-order 8 bits of STATUS. */ 0604: extern void _exit (int __status) __attribute__ ((__noreturn__)); 0605: 0606: 0607: /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; 0608: the `_SC_*' symbols for the NAME argument to `sysconf'; 0609: and the `_CS_*' symbols for the NAME argument to `confstr'. */ 0610: #include <bits/confname.h> 0611: 0612: /* Get file-specific configuration information about PATH. */ 0613: extern long int pathconf (__const char *__path, int __name) 0614: __THROW __nonnull ((1)); 0615: 0616: /* Get file-specific configuration about descriptor FD. */ 0617: extern long int fpathconf (int __fd, int __name) __THROW; 0618: 0619: /* Get the value of the system variable NAME. */ 0620: extern long int sysconf (int __name) __THROW; 0621: 0622: #ifdef __USE_POSIX2 0623: /* Get the value of the string-valued system variable NAME. */ 0624: extern size_t confstr (int __name, char *__buf, size_t __len) __THROW; 0625: #endif 0626: 0627: 0628: /* Get the process ID of the calling process. */ 0629: extern __pid_t getpid (void) __THROW; 0630: 0631: /* Get the process ID of the calling process's parent. */ 0632: extern __pid_t getppid (void) __THROW; 0633: 0634: /* Get the process group ID of the calling process. 0635: This function is different on old BSD. */ 0636: #ifndef __FAVOR_BSD 0637: extern __pid_t getpgrp (void) __THROW; 0638: #else 0639: # ifdef __REDIRECT_NTH 0640: extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid); 0641: # else 0642: # define getpgrp __getpgid 0643: # endif 0644: #endif 0645: 0646: /* Get the process group ID of process PID. */ 0647: extern __pid_t __getpgid (__pid_t __pid) __THROW; 0648: #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 0649: extern __pid_t getpgid (__pid_t __pid) __THROW; 0650: #endif 0651: 0652: 0653: /* Set the process group ID of the process matching PID to PGID. 0654: If PID is zero, the current process's process group ID is set. 0655: If PGID is zero, the process ID of the process is used. */ 0656: extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW; 0657: 0658: #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED 0659: /* Both System V and BSD have `setpgrp' functions, but with different 0660: calling conventions. The BSD function is the same as POSIX.1 `setpgid' 0661: (above). The System V function takes no arguments and puts the calling 0662: process in its on group like `setpgid (0, 0)'. 0663: 0664: New programs should always use `setpgid' instead. 0665: 0666: The default in GNU is to provide the System V function. The BSD 0667: function is available under -D_BSD_SOURCE. */ 0668: 0669: # ifndef __FAVOR_BSD 0670: 0671: /* Set the process group ID of the calling process to its own PID. 0672: This is exactly the same as `setpgid (0, 0)'. */ 0673: extern int setpgrp (void) __THROW; 0674: 0675: # else 0676: 0677: /* Another name for `setpgid' (above). */ 0678: # ifdef __REDIRECT_NTH 0679: extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid); 0680: # else 0681: # define setpgrp setpgid 0682: # endif 0683: 0684: # endif /* Favor BSD. */ 0685: #endif /* Use SVID or BSD. */ 0686: 0687: /* Create a new session with the calling process as its leader. 0688: The process group IDs of the session and the calling process 0689: are set to the process ID of the calling process, which is returned. */ 0690: extern __pid_t setsid (void) __THROW; 0691: 0692: #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 0693: /* Return the session ID of the given process. */ 0694: extern __pid_t getsid (__pid_t __pid) __THROW; 0695: #endif 0696: 0697: /* Get the real user ID of the calling process. */ 0698: extern __uid_t getuid (void) __THROW; 0699: 0700: /* Get the effective user ID of the calling process. */ 0701: extern __uid_t geteuid (void) __THROW; 0702: 0703: /* Get the real group ID of the calling process. */ 0704: extern __gid_t getgid (void) __THROW; 0705: 0706: /* Get the effective group ID of the calling process. */ 0707: extern __gid_t getegid (void) __THROW; 0708: 0709: /* If SIZE is zero, return the number of supplementary groups 0710: the calling process is in. Otherwise, fill in the group IDs 0711: of its supplementary groups in LIST and return the number written. */ 0712: extern int getgroups (int __size, __gid_t __list[]) __THROW __wur; 0713: 0714: #ifdef __USE_GNU 0715: /* Return nonzero iff the calling process is in group GID. */ 0716: extern int group_member (__gid_t __gid) __THROW; 0717: #endif 0718: 0719: /* Set the user ID of the calling process to UID. 0720: If the calling process is the super-user, set the real 0721: and effective user IDs, and the saved set-user-ID to UID; 0722: if not, the effective user ID is set to UID. */ 0723: extern int setuid (__uid_t __uid) __THROW; 0724: 0725: #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 0726: /* Set the real user ID of the calling process to RUID, 0727: and the effective user ID of the calling process to EUID. */ 0728: extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW; 0729: #endif 0730: 0731: #if defined __USE_BSD || defined __USE_XOPEN2K 0732: /* Set the effective user ID of the calling process to UID. */ 0733: extern int seteuid (__uid_t __uid) __THROW; 0734: #endif /* Use BSD. */ 0735: 0736: /* Set the group ID of the calling process to GID. 0737: If the calling process is the super-user, set the real 0738: and effective group IDs, and the saved set-group-ID to GID; 0739: if not, the effective group ID is set to GID. */ 0740: extern int setgid (__gid_t __gid) __THROW; 0741: 0742: #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 0743: /* Set the real group ID of the calling process to RGID, 0744: and the effective group ID of the calling process to EGID. */ 0745: extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW; 0746: #endif 0747: 0748: #if defined __USE_BSD || defined __USE_XOPEN2K 0749: /* Set the effective group ID of the calling process to GID. */ 0750: extern int setegid (__gid_t __gid) __THROW; 0751: #endif /* Use BSD. */ 0752: 0753: #ifdef __USE_GNU 0754: /* Fetch the real user ID, effective user ID, and saved-set user ID, 0755: of the calling process. */ 0756: extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid) 0757: __THROW; 0758: 0759: /* Fetch the real group ID, effective group ID, and saved-set group ID, 0760: of the calling process. */ 0761: extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid) 0762: __THROW; 0763: 0764: /* Set the real user ID, effective user ID, and saved-set user ID, 0765: of the calling process to RUID, EUID, and SUID, respectively. */ 0766: extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid) 0767: __THROW; 0768: 0769: /* Set the real group ID, effective group ID, and saved-set group ID, 0770: of the calling process to RGID, EGID, and SGID, respectively. */ 0771: extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid) 0772: __THROW; 0773: #endif 0774: 0775: 0776: /* Clone the calling process, creating an exact copy. 0777: Return -1 for errors, 0 to the new process, 0778: and the process ID of the new process to the old process. */ 0779: extern __pid_t fork (void) __THROWNL; 0780: 0781: #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ 0782: || defined __USE_BSD 0783: /* Clone the calling process, but without copying the whole address space. 0784: The calling process is suspended until the new process exits or is 0785: replaced by a call to `execve'. Return -1 for errors, 0 to the new process, 0786: and the process ID of the new process to the old process. */ 0787: extern __pid_t vfork (void) __THROW; 0788: #endif /* Use BSD or XPG < 7. */ 0789: 0790: 0791: /* Return the pathname of the terminal FD is open on, or NULL on errors. 0792: The returned storage is good only until the next call to this function. */ 0793: extern char *ttyname (int __fd) __THROW; 0794: 0795: /* Store at most BUFLEN characters of the pathname of the terminal FD is 0796: open on in BUF. Return 0 on success, otherwise an error number. */ 0797: extern int ttyname_r (int __fd, char *__buf, size_t __buflen) 0798: __THROW __nonnull ((2)) __wur; 0799: 0800: /* Return 1 if FD is a valid descriptor associated 0801: with a terminal, zero if not. */ 0802: extern int isatty (int __fd) __THROW; 0803: 0804: #if defined __USE_BSD \ 0805: || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98) 0806: /* Return the index into the active-logins file (utmp) for 0807: the controlling terminal. */ 0808: extern int ttyslot (void) __THROW; 0809: #endif 0810: 0811: 0812: /* Make a link to FROM named TO. */ 0813: extern int link (__const char *__from, __const char *__to) 0814: __THROW __nonnull ((1, 2)) __wur; 0815: 0816: #ifdef __USE_ATFILE 0817: /* Like link but relative paths in TO and FROM are interpreted relative 0818: to FROMFD and TOFD respectively. */ 0819: extern int linkat (int __fromfd, __const char *__from, int __tofd, 0820: __const char *__to, int __flags) 0821: __THROW __nonnull ((2, 4)) __wur; 0822: #endif 0823: 0824: #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 0825: /* Make a symbolic link to FROM named TO. */ 0826: extern int symlink (__const char *__from, __const char *__to) 0827: __THROW __nonnull ((1, 2)) __wur; 0828: 0829: /* Read the contents of the symbolic link PATH into no more than 0830: LEN bytes of BUF. The contents are not null-terminated. 0831: Returns the number of characters read, or -1 for errors. */ 0832: extern ssize_t readlink (__const char *__restrict __path, 0833: char *__restrict __buf, size_t __len) 0834: __THROW __nonnull ((1, 2)) __wur; 0835: #endif /* Use BSD. */ 0836: 0837: #ifdef __USE_ATFILE 0838: /* Like symlink but a relative path in TO is interpreted relative to TOFD. */ 0839: extern int symlinkat (__const char *__from, int __tofd, 0840: __const char *__to) __THROW __nonnull ((1, 3)) __wur; 0841: 0842: /* Like readlink but a relative PATH is interpreted relative to FD. */ 0843: extern ssize_t readlinkat (int __fd, __const char *__restrict __path, 0844: char *__restrict __buf, size_t __len) 0845: __THROW __nonnull ((2, 3)) __wur; 0846: #endif 0847: 0848: /* Remove the link NAME. */ 0849: extern int unlink (__const char *__name) __THROW __nonnull ((1)); 0850: 0851: #ifdef __USE_ATFILE 0852: /* Remove the link NAME relative to FD. */ 0853: extern int unlinkat (int __fd, __const char *__name, int __flag) 0854: __THROW __nonnull ((2)); 0855: #endif 0856: 0857: /* Remove the directory PATH. */ 0858: extern int rmdir (__const char *__path) __THROW __nonnull ((1)); 0859: 0860: 0861: /* Return the foreground process group ID of FD. */ 0862: extern __pid_t tcgetpgrp (int __fd) __THROW; 0863: 0864: /* Set the foreground process group ID of FD set PGRP_ID. */ 0865: extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW; 0866: 0867: 0868: /* Return the login name of the user. 0869: 0870: This function is a possible cancellation point and therefore not 0871: marked with __THROW. */ 0872: extern char *getlogin (void); 0873: #if defined __USE_REENTRANT || defined __USE_POSIX199506 0874: /* Return at most NAME_LEN characters of the login name of the user in NAME. 0875: If it cannot be determined or some other error occurred, return the error 0876: code. Otherwise return 0. 0877: 0878: This function is a possible cancellation point and therefore not 0879: marked with __THROW. */ 0880: extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1)); 0881: #endif 0882: 0883: #ifdef __USE_BSD 0884: /* Set the login name returned by `getlogin'. */ 0885: extern int setlogin (__const char *__name) __THROW __nonnull ((1)); 0886: #endif 0887: 0888: 0889: #ifdef __USE_POSIX2 0890: /* Get definitions and prototypes for functions to process the 0891: arguments in ARGV (ARGC of them, minus the program name) for 0892: options given in OPTS. */ 0893: # define __need_getopt 0894: # include <getopt.h> 0895: #endif 0896: 0897: 0898: #if defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K 0899: /* Put the name of the current host in no more than LEN bytes of NAME. 0900: The result is null-terminated if LEN is large enough for the full 0901: name and the terminator. */ 0902: extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1)); 0903: #endif 0904: 0905: 0906: #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98) 0907: /* Set the name of the current host to NAME, which is LEN bytes long. 0908: This call is restricted to the super-user. */ 0909: extern int sethostname (__const char *__name, size_t __len) 0910: __THROW __nonnull ((1)) __wur; 0911: 0912: /* Set the current machine's Internet number to ID. 0913: This call is restricted to the super-user. */ 0914: extern int sethostid (long int __id) __THROW __wur; 0915: 0916: 0917: /* Get and set the NIS (aka YP) domain name, if any. 0918: Called just like `gethostname' and `sethostname'. 0919: The NIS domain name is usually the empty string when not using NIS. */ 0920: extern int getdomainname (char *__name, size_t __len) 0921: __THROW __nonnull ((1)) __wur; 0922: extern int setdomainname (__const char *__name, size_t __len) 0923: __THROW __nonnull ((1)) __wur; 0924: 0925: 0926: /* Revoke access permissions to all processes currently communicating 0927: with the control terminal, and then send a SIGHUP signal to the process 0928: group of the control terminal. */ 0929: extern int vhangup (void) __THROW; 0930: 0931: /* Revoke the access of all descriptors currently open on FILE. */ 0932: extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur; 0933: 0934: 0935: /* Enable statistical profiling, writing samples of the PC into at most 0936: SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling 0937: is enabled, the system examines the user PC and increments 0938: SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, 0939: disable profiling. Returns zero on success, -1 on error. */ 0940: extern int profil (unsigned short int *__sample_buffer, size_t __size, 0941: size_t __offset, unsigned int __scale) 0942: __THROW __nonnull ((1)); 0943: 0944: 0945: /* Turn accounting on if NAME is an existing file. The system will then write 0946: a record for each process as it terminates, to this file. If NAME is NULL, 0947: turn accounting off. This call is restricted to the super-user. */ 0948: extern int acct (__const char *__name) __THROW; 0949: 0950: 0951: /* Successive calls return the shells listed in `/etc/shells'. */ 0952: extern char *getusershell (void) __THROW; 0953: extern void endusershell (void) __THROW; /* Discard cached info. */ 0954: extern void setusershell (void) __THROW; /* Rewind and re-read the file. */ 0955: 0956: 0957: /* Put the program in the background, and dissociate from the controlling 0958: terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, 0959: redirects stdin, stdout, and stderr to /dev/null. */ 0960: extern int daemon (int __nochdir, int __noclose) __THROW __wur; 0961: #endif /* Use BSD || X/Open. */ 0962: 0963: 0964: #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K) 0965: /* Make PATH be the root directory (the starting point for absolute paths). 0966: This call is restricted to the super-user. */ 0967: extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur; 0968: 0969: /* Prompt with PROMPT and read a string from the terminal without echoing. 0970: Uses /dev/tty if possible; otherwise stderr and stdin. */ 0971: extern char *getpass (__const char *__prompt) __nonnull ((1)); 0972: #endif /* Use BSD || X/Open. */ 0973: 0974: 0975: #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K 0976: /* Make all changes done to FD actually appear on disk. 0977: 0978: This function is a cancellation point and therefore not marked with 0979: __THROW. */ 0980: extern int fsync (int __fd); 0981: #endif /* Use BSD || X/Open || Unix98. */ 0982: 0983: 0984: #ifdef __USE_GNU 0985: /* Make all changes done to all files on the file system associated 0986: with FD actually appear on disk. */ 0987: extern int syncfs (int __fd) __THROW; 0988: #endif 0989: 0990: 0991: #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED 0992: 0993: /* Return identifier for the current host. */ 0994: extern long int gethostid (void); 0995: 0996: /* Make all changes done to all files actually appear on disk. */ 0997: extern void sync (void) __THROW; 0998: 0999: 1000: # if defined __USE_BSD || !defined __USE_XOPEN2K 1001: /* Return the number of bytes in a page. This is the system's page size, 1002: which is not necessarily the same as the hardware page size. */ 1003: extern int getpagesize (void) __THROW __attribute__ ((__const__)); 1004: 1005: 1006: /* Return the maximum number of file descriptors 1007: the current process could possibly have. */ 1008: extern int getdtablesize (void) __THROW; 1009: # endif 1010: 1011: #endif /* Use BSD || X/Open Unix. */ 1012: 1013: 1014: #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 1015: 1016: /* Truncate FILE to LENGTH bytes. */ 1017: # ifndef __USE_FILE_OFFSET64 1018: extern int truncate (__const char *__file, __off_t __length) 1019: __THROW __nonnull ((1)) __wur; 1020: # else 1021: # ifdef __REDIRECT_NTH 1022: extern int __REDIRECT_NTH (truncate, 1023: (__const char *__file, __off64_t __length), 1024: truncate64) __nonnull ((1)) __wur; 1025: # else 1026: # define truncate truncate64 1027: # endif 1028: # endif 1029: # ifdef __USE_LARGEFILE64 1030: extern int truncate64 (__const char *__file, __off64_t __length) 1031: __THROW __nonnull ((1)) __wur; 1032: # endif 1033: 1034: #endif /* Use BSD || X/Open Unix || POSIX 2008. */ 1035: 1036: #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K 1037: 1038: /* Truncate the file FD is open on to LENGTH bytes. */ 1039: # ifndef __USE_FILE_OFFSET64 1040: extern int ftruncate (int __fd, __off_t __length) __THROW __wur; 1041: # else 1042: # ifdef __REDIRECT_NTH 1043: extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length), 1044: ftruncate64) __wur; 1045: # else 1046: # define ftruncate ftruncate64 1047: # endif 1048: # endif 1049: # ifdef __USE_LARGEFILE64 1050: extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur; 1051: # endif 1052: 1053: #endif /* Use BSD || X/Open Unix || POSIX 2003. */ 1054: 1055: 1056: #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \ 1057: || defined __USE_MISC 1058: 1059: /* Set the end of accessible data space (aka "the break") to ADDR. 1060: Returns zero on success and -1 for errors (with errno set). */ 1061: extern int brk (void *__addr) __THROW __wur; 1062: 1063: /* Increase or decrease the end of accessible data space by DELTA bytes. 1064: If successful, returns the address the previous end of data space 1065: (i.e. the beginning of the new space, if DELTA > 0); 1066: returns (void *) -1 for errors (with errno set). */ 1067: extern void *sbrk (intptr_t __delta) __THROW; 1068: #endif 1069: 1070: 1071: #ifdef __USE_MISC 1072: /* Invoke `system call' number SYSNO, passing it the remaining arguments. 1073: This is completely system-dependent, and not often useful. 1074: 1075: In Unix, `syscall' sets `errno' for all errors and most calls return -1 1076: for errors; in many systems you cannot pass arguments or get return 1077: values for all system calls (`pipe', `fork', and `getppid' typically 1078: among them). 1079: 1080: In Mach, all system calls take normal arguments and always return an 1081: error code (zero for success). */ 1082: extern long int syscall (long int __sysno, ...) __THROW; 1083: 1084: #endif /* Use misc. */ 1085: 1086: 1087: #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK 1088: /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both 1089: files consistent. Some systems have them there and some here, and some 1090: software depends on the macros being defined without including both. */ 1091: 1092: /* `lockf' is a simpler interface to the locking facilities of `fcntl'. 1093: LEN is always relative to the current file position. 1094: The CMD argument is one of the following. 1095: 1096: This function is a cancellation point and therefore not marked with 1097: __THROW. */ 1098: 1099: # define F_ULOCK 0 /* Unlock a previously locked region. */ 1100: # define F_LOCK 1 /* Lock a region for exclusive use. */ 1101: # define F_TLOCK 2 /* Test and lock a region for exclusive use. */ 1102: # define F_TEST 3 /* Test a region for other processes locks. */ 1103: 1104: # ifndef __USE_FILE_OFFSET64 1105: extern int lockf (int __fd, int __cmd, __off_t __len) __wur; 1106: # else 1107: # ifdef __REDIRECT 1108: extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), 1109: lockf64) __wur; 1110: # else 1111: # define lockf lockf64 1112: # endif 1113: # endif 1114: # ifdef __USE_LARGEFILE64 1115: extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur; 1116: # endif 1117: #endif /* Use misc and F_LOCK not already defined. */ 1118: 1119: 1120: #ifdef __USE_GNU 1121: 1122: /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' 1123: set to EINTR. */ 1124: 1125: # define TEMP_FAILURE_RETRY(expression) \ 1126: (__extension__ \ 1127: ({ long int __result; \ 1128: do __result = (long int) (expression); \ 1129: while (__result == -1L && errno == EINTR); \ 1130: __result; })) 1131: #endif 1132: 1133: #if defined __USE_POSIX199309 || defined __USE_UNIX98 1134: /* Synchronize at least the data part of a file with the underlying 1135: media. */ 1136: extern int fdatasync (int __fildes); 1137: #endif /* Use POSIX199309 */ 1138: 1139: 1140: /* XPG4.2 specifies that prototypes for the encryption functions must 1141: be defined here. */ 1142: #ifdef __USE_XOPEN 1143: /* Encrypt at most 8 characters from KEY using salt to perturb DES. */ 1144: extern char *crypt (__const char *__key, __const char *__salt) 1145: __THROW __nonnull ((1, 2)); 1146: 1147: /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt 1148: block in place. */ 1149: extern void encrypt (char *__libc_block, int __edflag) __THROW __nonnull ((1)); 1150: 1151: 1152: /* Swab pairs bytes in the first N bytes of the area pointed to by 1153: FROM and copy the result to TO. The value of TO must not be in the 1154: range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM 1155: is without partner. */ 1156: extern void swab (__const void *__restrict __from, void *__restrict __to, 1157: ssize_t __n) __THROW __nonnull ((1, 2)); 1158: #endif 1159: 1160: 1161: /* The Single Unix specification demands this prototype to be here. 1162: It is also found in <stdio.h>. */ 1163: #if defined __USE_XOPEN || defined __USE_XOPEN2K8 1164: /* Return the name of the controlling terminal. */ 1165: extern char *ctermid (char *__s) __THROW; 1166: #endif 1167: 1168: 1169: /* Define some macros helping to catch buffer overflows. */ 1170: #if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline 1171: # include <bits/unistd.h> 1172: #endif 1173: 1174: __END_DECLS 1175: 1176: #endif /* unistd.h */ 1177:
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