1 /* Copyright (C) 1991-2012 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
19 * POSIX Standard: 6.5 File Control Operations <fcntl.h>
27 /* This must be early so <bits/fcntl.h> can define types winningly. */
30 /* Get __mode_t, __dev_t and __off_t .*/
31 #include <bits/types.h>
33 /* Get the definitions of O_*, F_*, FD_*: all the
34 numbers and flag bits for `open', `fcntl', et al. */
35 #include <bits/fcntl.h>
37 #if defined __USE_XOPEN || defined __USE_XOPEN2K
38 /* The Single Unix specification says that some more types are
40 # ifndef __mode_t_defined
41 typedef __mode_t mode_t;
42 # define __mode_t_defined
45 # ifndef __off_t_defined
46 # ifndef __USE_FILE_OFFSET64
47 typedef __off_t off_t;
49 typedef __off64_t off_t;
51 # define __off_t_defined
54 # ifndef __pid_t_defined
55 typedef __pid_t pid_t;
56 # define __pid_t_defined
60 /* For XPG all symbols from <sys/stat.h> should also be available. */
61 #if defined __USE_XOPEN || defined __USE_XOPEN2K8
62 # define __need_timespec
64 # include <bits/stat.h>
66 # define S_IFMT __S_IFMT
67 # define S_IFDIR __S_IFDIR
68 # define S_IFCHR __S_IFCHR
69 # define S_IFBLK __S_IFBLK
70 # define S_IFREG __S_IFREG
72 # define S_IFIFO __S_IFIFO
75 # define S_IFLNK __S_IFLNK
77 # if (defined __USE_UNIX98 || defined __USE_XOPEN2K8) && defined __S_IFSOCK
78 # define S_IFSOCK __S_IFSOCK
81 /* Protection bits. */
83 # define S_ISUID __S_ISUID /* Set user ID on execution. */
84 # define S_ISGID __S_ISGID /* Set group ID on execution. */
86 # if defined __USE_BSD || defined __USE_MISC || defined __USE_XOPEN
87 /* Save swapped text after use (sticky bit). This is pretty well obsolete. */
88 # define S_ISVTX __S_ISVTX
91 # define S_IRUSR __S_IREAD /* Read by owner. */
92 # define S_IWUSR __S_IWRITE /* Write by owner. */
93 # define S_IXUSR __S_IEXEC /* Execute by owner. */
94 /* Read, write, and execute by owner. */
95 # define S_IRWXU (__S_IREAD|__S_IWRITE|__S_IEXEC)
97 # define S_IRGRP (S_IRUSR >> 3) /* Read by group. */
98 # define S_IWGRP (S_IWUSR >> 3) /* Write by group. */
99 # define S_IXGRP (S_IXUSR >> 3) /* Execute by group. */
100 /* Read, write, and execute by group. */
101 # define S_IRWXG (S_IRWXU >> 3)
103 # define S_IROTH (S_IRGRP >> 3) /* Read by others. */
104 # define S_IWOTH (S_IWGRP >> 3) /* Write by others. */
105 # define S_IXOTH (S_IXGRP >> 3) /* Execute by others. */
106 /* Read, write, and execute by others. */
107 # define S_IRWXO (S_IRWXG >> 3)
111 # ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */
112 /* Values for the second argument to access.
113 These may be OR'd together. */
114 # define R_OK 4 /* Test for read permission. */
115 # define W_OK 2 /* Test for write permission. */
116 # define X_OK 1 /* Test for execute permission. */
117 # define F_OK 0 /* Test for existence. */
119 #endif /* Use misc. */
121 /* XPG wants the following symbols. <stdio.h> has the same definitions. */
122 #if defined __USE_XOPEN || defined __USE_XOPEN2K8
123 # define SEEK_SET 0 /* Seek from beginning of file. */
124 # define SEEK_CUR 1 /* Seek from current position. */
125 # define SEEK_END 2 /* Seek from end of file. */
129 # define AT_FDCWD -100 /* Special value used to indicate
130 the *at functions should use the
131 current working directory. */
132 # define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic links. */
133 # define AT_REMOVEDIR 0x200 /* Remove directory instead of
135 # define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */
137 # define AT_NO_AUTOMOUNT 0x800 /* Suppress terminal automount
139 # define AT_EMPTY_PATH 0x1000 /* Allow empty relative pathname. */
141 # define AT_EACCESS 0x200 /* Test access permitted for
142 effective IDs, not real IDs. */
145 /* Do the file control operation described by CMD on FD.
146 The remaining arguments are interpreted depending on CMD.
148 This function is a cancellation point and therefore not marked with
150 extern int fcntl (int __fd, int __cmd, ...);
152 /* Open FILE and return a new file descriptor for it, or -1 on error.
153 OFLAG determines the type of access used. If O_CREAT is on OFLAG,
154 the third argument is taken as a `mode_t', the mode of the created file.
156 This function is a cancellation point and therefore not marked with
158 #ifndef __USE_FILE_OFFSET64
159 extern int open (const char *__file, int __oflag, ...) __nonnull ((1));
162 extern int __REDIRECT (open, (const char *__file, int __oflag, ...), open64)
168 #ifdef __USE_LARGEFILE64
169 extern int open64 (const char *__file, int __oflag, ...) __nonnull ((1));
173 /* Similar to `open' but a relative path name is interpreted relative to
174 the directory for which FD is a descriptor.
176 NOTE: some other `openat' implementation support additional functionality
177 through this interface, especially using the O_XATTR flag. This is not
180 This function is a cancellation point and therefore not marked with
182 # ifndef __USE_FILE_OFFSET64
183 extern int openat (int __fd, const char *__file, int __oflag, ...)
187 extern int __REDIRECT (openat, (int __fd, const char *__file, int __oflag,
188 ...), openat64) __nonnull ((2));
190 # define openat openat64
193 # ifdef __USE_LARGEFILE64
194 extern int openat64 (int __fd, const char *__file, int __oflag, ...)
199 /* Create and open FILE, with mode MODE. This takes an `int' MODE
200 argument because that is what `mode_t' will be widened to.
202 This function is a cancellation point and therefore not marked with
204 #ifndef __USE_FILE_OFFSET64
205 extern int creat (const char *__file, __mode_t __mode) __nonnull ((1));
208 extern int __REDIRECT (creat, (const char *__file, __mode_t __mode),
209 creat64) __nonnull ((1));
211 # define creat creat64
214 #ifdef __USE_LARGEFILE64
215 extern int creat64 (const char *__file, __mode_t __mode) __nonnull ((1));
218 #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
219 && !defined __USE_POSIX))
220 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
221 files consistent. Some systems have them there and some here, and some
222 software depends on the macros being defined without including both. */
224 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
225 LEN is always relative to the current file position.
226 The CMD argument is one of the following. */
228 # define F_ULOCK 0 /* Unlock a previously locked region. */
229 # define F_LOCK 1 /* Lock a region for exclusive use. */
230 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
231 # define F_TEST 3 /* Test a region for other processes locks. */
233 # ifndef __USE_FILE_OFFSET64
234 extern int lockf (int __fd, int __cmd, __off_t __len);
237 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
239 # define lockf lockf64
242 # ifdef __USE_LARGEFILE64
243 extern int lockf64 (int __fd, int __cmd, __off64_t __len);
248 /* Advice the system about the expected behaviour of the application with
249 respect to the file associated with FD. */
250 # ifndef __USE_FILE_OFFSET64
251 extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
252 int __advise) __THROW;
254 # ifdef __REDIRECT_NTH
255 extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
256 __off64_t __len, int __advise),
259 # define posix_fadvise posix_fadvise64
262 # ifdef __USE_LARGEFILE64
263 extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
264 int __advise) __THROW;
268 /* Reserve storage for the data of the file associated with FD.
270 This function is a possible cancellation point and therefore not
271 marked with __THROW. */
272 # ifndef __USE_FILE_OFFSET64
273 extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
276 extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
280 # define posix_fallocate posix_fallocate64
283 # ifdef __USE_LARGEFILE64
284 extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);
289 /* Define some inlines helping to catch common problems. */
290 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function \
291 && defined __va_arg_pack_len
292 # include <bits/fcntl2.h>