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.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
20 * POSIX Standard: 6.5 File Control Operations <fcntl.h>
28 /* This must be early so <bits/fcntl.h> can define types winningly. */
31 /* Get the definitions of O_*, F_*, FD_*: all the
32 numbers and flag bits for `open', `fcntl', et al. */
33 #include <bits/fcntl.h>
35 /* For XPG all symbols from <sys/stat.h> should also be available. */
37 # include <sys/stat.h>
41 # ifndef R_OK /* Verbatim from <unistd.h>. Ugh. */
42 /* Values for the second argument to access.
43 These may be OR'd together. */
44 # define R_OK 4 /* Test for read permission. */
45 # define W_OK 2 /* Test for write permission. */
46 # define X_OK 1 /* Test for execute permission. */
47 # define F_OK 0 /* Test for existence. */
49 #endif /* Use misc. */
51 /* XPG wants the following symbols. */
52 #ifdef __USE_XOPEN /* <stdio.h> has the same definitions. */
53 # define SEEK_SET 0 /* Seek from beginning of file. */
54 # define SEEK_CUR 1 /* Seek from current position. */
55 # define SEEK_END 2 /* Seek from end of file. */
59 # define AT_FDCWD -100 /* Special value used to indicate
60 the *at functions should use the
61 current working directory. */
62 # define AT_SYMLINK_NOFOLLOW 0x100 /* Do not follow symbolic links. */
63 # define AT_REMOVEDIR 0x200 /* Remove directory instead of
65 # define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */
66 # define AT_EACCESS 0x200 /* Test access permitted for
67 effective IDs, not real IDs. */
70 /* Do the file control operation described by CMD on FD.
71 The remaining arguments are interpreted depending on CMD.
73 This function is a cancellation point and therefore not marked with
75 #if !defined(__USE_FILE_OFFSET64) || defined(__LP64__)
76 extern int fcntl (int __fd, int __cmd, ...);
78 extern int __fcntl_nocancel(int, int, long) attribute_hidden;
79 libc_hidden_proto(fcntl)
83 extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
85 # define fcntl fcntl64
88 #if defined(__USE_LARGEFILE64) && !defined(__LP64__)
89 extern int fcntl64 (int __fd, int __cmd, ...);
91 extern int __fcntl64_nocancel(int, int, long) attribute_hidden;
92 libc_hidden_proto(fcntl64)
96 /* Open FILE and return a new file descriptor for it, or -1 on error.
97 OFLAG determines the type of access used. If O_CREAT is on OFLAG,
98 the third argument is taken as a `mode_t', the mode of the created file.
100 This function is a cancellation point and therefore not marked with
102 #ifndef __USE_FILE_OFFSET64
103 extern int open (const char *__file, int __oflag, ...) __nonnull ((1));
104 libc_hidden_proto(open)
106 extern int __open2_nocancel(const char *, int) __nonnull ((1)) attribute_hidden;
107 extern int __open_nocancel(const char *, int, mode_t) __nonnull ((1)) attribute_hidden;
111 extern int __REDIRECT (open, (const char *__file, int __oflag, ...), open64)
117 #ifdef __USE_LARGEFILE64
118 extern int open64 (const char *__file, int __oflag, ...) __nonnull ((1));
119 libc_hidden_proto(open64)
123 /* Similar to `open' but a relative path name is interpreted relative to
124 the directory for which FD is a descriptor.
126 NOTE: some other `openat' implementation support additional functionality
127 through this interface, especially using the O_XATTR flag. This is not
130 This function is a cancellation point and therefore not marked with
132 # ifndef __USE_FILE_OFFSET64
133 extern int openat (int __fd, const char *__file, int __oflag, ...)
135 libc_hidden_proto(openat)
138 extern int __REDIRECT (openat, (int __fd, const char *__file, int __oflag,
139 ...), openat64) __nonnull ((2));
141 # define openat openat64
145 extern int openat64 (int __fd, const char *__file, int __oflag, ...)
149 /* Create and open FILE, with mode MODE. This takes an `int' MODE
150 argument because that is what `mode_t' will be widened to.
152 This function is a cancellation point and therefore not marked with
154 #ifndef __USE_FILE_OFFSET64
155 extern int creat (const char *__file, __mode_t __mode) __nonnull ((1));
158 extern int __REDIRECT (creat, (const char *__file, __mode_t __mode),
159 creat64) __nonnull ((1));
161 # define creat creat64
164 #ifdef __USE_LARGEFILE64
165 extern int creat64 (const char *__file, __mode_t __mode) __nonnull ((1));
168 #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
169 && !defined __USE_POSIX))
170 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
171 files consistent. Some systems have them there and some here, and some
172 software depends on the macros being defined without including both. */
174 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
175 LEN is always relative to the current file position.
176 The CMD argument is one of the following. */
178 # define F_ULOCK 0 /* Unlock a previously locked region. */
179 # define F_LOCK 1 /* Lock a region for exclusive use. */
180 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
181 # define F_TEST 3 /* Test a region for other processes locks. */
183 # ifndef __USE_FILE_OFFSET64
184 extern int lockf (int __fd, int __cmd, __off_t __len);
185 libc_hidden_proto(lockf)
188 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
190 # define lockf lockf64
193 # ifdef __USE_LARGEFILE64
194 extern int lockf64 (int __fd, int __cmd, __off64_t __len);
198 #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
199 /* Advice the system about the expected behaviour of the application with
200 respect to the file associated with FD. */
201 # ifndef __USE_FILE_OFFSET64
202 extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
203 int __advise) __THROW;
205 # ifdef __REDIRECT_NTH
206 extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
207 __off64_t __len, int __advise),
210 # define posix_fadvise posix_fadvise64
213 # ifdef __USE_LARGEFILE64
214 extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
215 int __advise) __THROW;
220 #if defined __UCLIBC_HAS_ADVANCED_REALTIME__
222 /* Reserve storage for the data of the file associated with FD.
224 This function is a possible cancellation points and therefore not
225 marked with __THROW. */
226 # ifndef __USE_FILE_OFFSET64
227 extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
230 extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
234 # define posix_fallocate posix_fallocate64
237 # ifdef __USE_LARGEFILE64
238 extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);