1/* Copyright (C) 1991,1992,1994-2001,2003,2004,2005,2006,2007, 2009 2 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20/* 21 * POSIX Standard: 6.5 File Control Operations <fcntl.h> 22 */ 23 24#ifndef _FCNTL_H 25#define _FCNTL_H 1 26 27#include <features.h> 28 29/* This must be early so <bits/fcntl.h> can define types winningly. */ 30__BEGIN_DECLS 31 32/* Get the definitions of O_*, F_*, FD_*: all the 33 numbers and flag bits for `open', `fcntl', et al. */ 34#include <bits/fcntl.h> 35 36/* For XPG all symbols from <sys/stat.h> should also be available. */ 37#ifdef __USE_XOPEN 38# include <sys/stat.h> 39#endif 40 41#ifdef __USE_MISC 42# ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */ 43/* Values for the second argument to access. 44 These may be OR'd together. */ 45# define R_OK 4 /* Test for read permission. */ 46# define W_OK 2 /* Test for write permission. */ 47# define X_OK 1 /* Test for execute permission. */ 48# define F_OK 0 /* Test for existence. */ 49# endif 50#endif /* Use misc. */ 51 52/* XPG wants the following symbols. */ 53#ifdef __USE_XOPEN /* <stdio.h> has the same definitions. */ 54# define SEEK_SET 0 /* Seek from beginning of file. */ 55# define SEEK_CUR 1 /* Seek from current position. */ 56# define SEEK_END 2 /* Seek from end of file. */ 57#endif /* XPG */ 58 59#ifdef __USE_ATFILE 60# define AT_FDCWD -100 /* Special value used to indicate 61 the *at functions should use the 62 current working directory. */ 63# define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic links. */ 64# define AT_REMOVEDIR 0x200 /* Remove directory instead of 65 unlinking file. */ 66# define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */ 67# define AT_EACCESS 0x200 /* Test access permitted for 68 effective IDs, not real IDs. */ 69#endif 70 71/* Do the file control operation described by CMD on FD. 72 The remaining arguments are interpreted depending on CMD. 73 74 This function is a cancellation point and therefore not marked with 75 __THROW. */ 76#if !defined(__USE_FILE_OFFSET64) || defined(__LP64__) 77extern int fcntl (int __fd, int __cmd, ...); 78#else 79# ifdef __REDIRECT 80extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64); 81# else 82# define fcntl fcntl64 83# endif 84#endif 85#if defined(__USE_LARGEFILE64) && !defined(__LP64__) 86extern int fcntl64 (int __fd, int __cmd, ...); 87#endif 88 89/* Open FILE and return a new file descriptor for it, or -1 on error. 90 OFLAG determines the type of access used. If O_CREAT is on OFLAG, 91 the third argument is taken as a `mode_t', the mode of the created file. 92 93 This function is a cancellation point and therefore not marked with 94 __THROW. */ 95#ifndef __USE_FILE_OFFSET64 96extern int open (__const char *__file, int __oflag, ...) __nonnull ((1)); 97#else 98# ifdef __REDIRECT 99extern int __REDIRECT (open, (__const char *__file, int __oflag, ...), open64) 100 __nonnull ((1)); 101# else 102# define open open64 103# endif 104#endif 105#ifdef __USE_LARGEFILE64 106extern int open64 (__const char *__file, int __oflag, ...) __nonnull ((1)); 107#endif 108 109#ifdef __USE_ATFILE 110/* Similar to `open' but a relative path name is interpreted relative to 111 the directory for which FD is a descriptor. 112 113 NOTE: some other `openat' implementation support additional functionality 114 through this interface, especially using the O_XATTR flag. This is not 115 yet supported here. 116 117 This function is a cancellation point and therefore not marked with 118 __THROW. */ 119# ifndef __USE_FILE_OFFSET64 120extern int openat (int __fd, __const char *__file, int __oflag, ...) 121 __nonnull ((2)); 122# else 123# ifdef __REDIRECT 124extern int __REDIRECT (openat, (int __fd, __const char *__file, int __oflag, 125 ...), openat64) __nonnull ((2)); 126# else 127# define openat openat64 128# endif 129# endif 130 131extern int openat64 (int __fd, __const char *__file, int __oflag, ...) 132 __nonnull ((2)); 133#endif 134 135/* Create and open FILE, with mode MODE. This takes an `int' MODE 136 argument because that is what `mode_t' will be widened to. 137 138 This function is a cancellation point and therefore not marked with 139 __THROW. */ 140#ifndef __USE_FILE_OFFSET64 141extern int creat (__const char *__file, __mode_t __mode) __nonnull ((1)); 142#else 143# ifdef __REDIRECT 144extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode), 145 creat64) __nonnull ((1)); 146# else 147# define creat creat64 148# endif 149#endif 150#ifdef __USE_LARGEFILE64 151extern int creat64 (__const char *__file, __mode_t __mode) __nonnull ((1)); 152#endif 153 154#if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \ 155 && !defined __USE_POSIX)) 156/* NOTE: These declarations also appear in <unistd.h>; be sure to keep both 157 files consistent. Some systems have them there and some here, and some 158 software depends on the macros being defined without including both. */ 159 160/* `lockf' is a simpler interface to the locking facilities of `fcntl'. 161 LEN is always relative to the current file position. 162 The CMD argument is one of the following. */ 163 164# define F_ULOCK 0 /* Unlock a previously locked region. */ 165# define F_LOCK 1 /* Lock a region for exclusive use. */ 166# define F_TLOCK 2 /* Test and lock a region for exclusive use. */ 167# define F_TEST 3 /* Test a region for other processes locks. */ 168 169# ifndef __USE_FILE_OFFSET64 170extern int lockf (int __fd, int __cmd, __off_t __len); 171# else 172# ifdef __REDIRECT 173extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64); 174# else 175# define lockf lockf64 176# endif 177# endif 178# ifdef __USE_LARGEFILE64 179extern int lockf64 (int __fd, int __cmd, __off64_t __len); 180# endif 181#endif 182 183#if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__ 184/* Advice the system about the expected behaviour of the application with 185 respect to the file associated with FD. */ 186# ifndef __USE_FILE_OFFSET64 187extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len, 188 int __advise) __THROW; 189# else 190# ifdef __REDIRECT_NTH 191extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset, 192 __off64_t __len, int __advise), 193 posix_fadvise64); 194# else 195# define posix_fadvise posix_fadvise64 196# endif 197# endif 198# ifdef __USE_LARGEFILE64 199extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len, 200 int __advise) __THROW; 201# endif 202 203#endif 204 205#if 0 /* && defined __UCLIBC_HAS_ADVANCED_REALTIME__ */ 206 207/* FIXME -- uClibc should probably implement these... */ 208 209/* Reserve storage for the data of the file associated with FD. 210 211 This function is a possible cancellation points and therefore not 212 marked with __THROW. */ 213# ifndef __USE_FILE_OFFSET64 214extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len); 215# else 216# ifdef __REDIRECT 217extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset, 218 __off64_t __len), 219 posix_fallocate64); 220# else 221# define posix_fallocate posix_fallocate64 222# endif 223# endif 224# ifdef __USE_LARGEFILE64 225extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len); 226# endif 227#endif 228 229 230__END_DECLS 231 232#endif /* fcntl.h */ 233