1 /* Copyright (C) 1991,1992,1994-2001,2003,2004,2005,2006,2007 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 extern int fcntl (int __fd, int __cmd, ...); 77 78 /* Open FILE and return a new file descriptor for it, or -1 on error. 79 OFLAG determines the type of access used. If O_CREAT is on OFLAG, 80 the third argument is taken as a `mode_t', the mode of the created file. 81 82 This function is a cancellation point and therefore not marked with 83 __THROW. */ 84 #ifndef __USE_FILE_OFFSET64 85 extern int open (__const char *__file, int __oflag, ...) __nonnull ((1)); 86 #else 87 # ifdef __REDIRECT 88 extern int __REDIRECT (open, (__const char *__file, int __oflag, ...), open64) 89 __nonnull ((1)); 90 # else 91 # define open open64 92 # endif 93 #endif 94 #ifdef __USE_LARGEFILE64 95 extern int open64 (__const char *__file, int __oflag, ...) __nonnull ((1)); 96 #endif 97 98 #ifdef __USE_ATFILE 99 /* Similar to `open' but a relative path name is interpreted relative to 100 the directory for which FD is a descriptor. 101 102 NOTE: some other `openat' implementation support additional functionality 103 through this interface, especially using the O_XATTR flag. This is not 104 yet supported here. 105 106 This function is a cancellation point and therefore not marked with 107 __THROW. */ 108 # ifndef __USE_FILE_OFFSET64 109 extern int openat (int __fd, __const char *__file, int __oflag, ...) 110 __nonnull ((2)); 111 # else 112 # ifdef __REDIRECT 113 extern int __REDIRECT (openat, (int __fd, __const char *__file, int __oflag, 114 ...), openat64) __nonnull ((2)); 115 # else 116 # define openat openat64 117 # endif 118 # endif 119 120 extern int openat64 (int __fd, __const char *__file, int __oflag, ...) 121 __nonnull ((2)); 122 #endif 123 124 /* Create and open FILE, with mode MODE. This takes an `int' MODE 125 argument because that is what `mode_t' will be widened to. 126 127 This function is a cancellation point and therefore not marked with 128 __THROW. */ 129 #ifndef __USE_FILE_OFFSET64 130 extern int creat (__const char *__file, __mode_t __mode) __nonnull ((1)); 131 #else 132 # ifdef __REDIRECT 133 extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode), 134 creat64) __nonnull ((1)); 135 # else 136 # define creat creat64 137 # endif 138 #endif 139 #ifdef __USE_LARGEFILE64 140 extern int creat64 (__const char *__file, __mode_t __mode) __nonnull ((1)); 141 #endif 142 143 #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \ 144 && !defined __USE_POSIX)) 145 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both 146 files consistent. Some systems have them there and some here, and some 147 software depends on the macros being defined without including both. */ 148 149 /* `lockf' is a simpler interface to the locking facilities of `fcntl'. 150 LEN is always relative to the current file position. 151 The CMD argument is one of the following. */ 152 153 # define F_ULOCK 0 /* Unlock a previously locked region. */ 154 # define F_LOCK 1 /* Lock a region for exclusive use. */ 155 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */ 156 # define F_TEST 3 /* Test a region for other processes locks. */ 157 158 # ifndef __USE_FILE_OFFSET64 159 extern int lockf (int __fd, int __cmd, __off_t __len); 160 # else 161 # ifdef __REDIRECT 162 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64); 163 # else 164 # define lockf lockf64 165 # endif 166 # endif 167 # ifdef __USE_LARGEFILE64 168 extern int lockf64 (int __fd, int __cmd, __off64_t __len); 169 # endif 170 #endif 171 172 #ifdef __USE_XOPEN2K 173 /* Advice the system about the expected behaviour of the application with 174 respect to the file associated with FD. */ 175 # ifndef __USE_FILE_OFFSET64 176 extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len, 177 int __advise) __THROW; 178 # else 179 # ifdef __REDIRECT_NTH 180 extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset, 181 __off64_t __len, int __advise), 182 posix_fadvise64); 183 # else 184 # define posix_fadvise posix_fadvise64 185 # endif 186 # endif 187 # ifdef __USE_LARGEFILE64 188 extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len, 189 int __advise) __THROW; 190 # endif 191 192 193 /* Reserve storage for the data of the file associated with FD. 194 195 This function is a possible cancellation points and therefore not 196 marked with __THROW. */ 197 # ifndef __USE_FILE_OFFSET64 198 extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len); 199 # else 200 # ifdef __REDIRECT 201 extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset, 202 __off64_t __len), 203 posix_fallocate64); 204 # else 205 # define posix_fallocate posix_fallocate64 206 # endif 207 # endif 208 # ifdef __USE_LARGEFILE64 209 extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len); 210 # endif 211 #endif 212 213 214 /* Define some inlines helping to catch common problems. */ 215 #if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline \ 216 && defined __va_arg_pack_len 217 # include <bits/fcntl2.h> 218 #endif 219 220 __END_DECLS 221 222 #endif /* fcntl.h */ 223
