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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 * POSIX Standard: 6.5 File Control Operations <fcntl.h>
29 /* This must be early so <bits/fcntl.h> can define types winningly. */
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>
36 /* For XPG all symbols from <sys/stat.h> should also be available. */
38 # include <sys/stat.h>
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. */
50 #endif /* Use misc. */
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. */
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
66 # define AT_SYMLINK_FOLLOW 0x400 /* Follow symbolic links. */
67 # define AT_EACCESS 0x200 /* Test access permitted for
68 effective IDs, not real IDs. */
71 /* Do the file control operation described by CMD on FD.
72 The remaining arguments are interpreted depending on CMD.
74 This function is a cancellation point and therefore not marked with
76 #if !defined(__USE_FILE_OFFSET64) || defined(__LP64__)
77 extern int fcntl (int __fd, int __cmd, ...);
79 extern int __fcntl_nocancel(int, int, long) attribute_hidden;
80 libc_hidden_proto(fcntl)
84 extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
86 # define fcntl fcntl64
89 #if defined(__USE_LARGEFILE64) && !defined(__LP64__)
90 extern int fcntl64 (int __fd, int __cmd, ...);
92 extern int __fcntl64_nocancel(int, int, long) attribute_hidden;
93 libc_hidden_proto(fcntl64)
97 /* Open FILE and return a new file descriptor for it, or -1 on error.
98 OFLAG determines the type of access used. If O_CREAT is on OFLAG,
99 the third argument is taken as a `mode_t', the mode of the created file.
101 This function is a cancellation point and therefore not marked with
103 #ifndef __USE_FILE_OFFSET64
104 extern int open (__const char *__file, int __oflag, ...) __nonnull ((1));
105 libc_hidden_proto(open)
107 extern int __open2_nocancel(const char *, int) __nonnull ((1)) attribute_hidden;
108 extern int __open_nocancel(const char *, int, mode_t) __nonnull ((1)) attribute_hidden;
112 extern int __REDIRECT (open, (__const char *__file, int __oflag, ...), open64)
118 #ifdef __USE_LARGEFILE64
119 extern int open64 (__const char *__file, int __oflag, ...) __nonnull ((1));
120 libc_hidden_proto(open64)
124 /* Similar to `open' but a relative path name is interpreted relative to
125 the directory for which FD is a descriptor.
127 NOTE: some other `openat' implementation support additional functionality
128 through this interface, especially using the O_XATTR flag. This is not
131 This function is a cancellation point and therefore not marked with
133 # ifndef __USE_FILE_OFFSET64
134 extern int openat (int __fd, __const char *__file, int __oflag, ...)
136 libc_hidden_proto(openat)
139 extern int __REDIRECT (openat, (int __fd, __const char *__file, int __oflag,
140 ...), openat64) __nonnull ((2));
142 # define openat openat64
146 extern int openat64 (int __fd, __const char *__file, int __oflag, ...)
150 /* Create and open FILE, with mode MODE. This takes an `int' MODE
151 argument because that is what `mode_t' will be widened to.
153 This function is a cancellation point and therefore not marked with
155 #ifndef __USE_FILE_OFFSET64
156 extern int creat (__const char *__file, __mode_t __mode) __nonnull ((1));
159 extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode),
160 creat64) __nonnull ((1));
162 # define creat creat64
165 #ifdef __USE_LARGEFILE64
166 extern int creat64 (__const char *__file, __mode_t __mode) __nonnull ((1));
169 #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
170 && !defined __USE_POSIX))
171 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
172 files consistent. Some systems have them there and some here, and some
173 software depends on the macros being defined without including both. */
175 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
176 LEN is always relative to the current file position.
177 The CMD argument is one of the following. */
179 # define F_ULOCK 0 /* Unlock a previously locked region. */
180 # define F_LOCK 1 /* Lock a region for exclusive use. */
181 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
182 # define F_TEST 3 /* Test a region for other processes locks. */
184 # ifndef __USE_FILE_OFFSET64
185 extern int lockf (int __fd, int __cmd, __off_t __len);
186 libc_hidden_proto(lockf)
189 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
191 # define lockf lockf64
194 # ifdef __USE_LARGEFILE64
195 extern int lockf64 (int __fd, int __cmd, __off64_t __len);
199 #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
200 /* Advice the system about the expected behaviour of the application with
201 respect to the file associated with FD. */
202 # ifndef __USE_FILE_OFFSET64
203 extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
204 int __advise) __THROW;
206 # ifdef __REDIRECT_NTH
207 extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
208 __off64_t __len, int __advise),
211 # define posix_fadvise posix_fadvise64
214 # ifdef __USE_LARGEFILE64
215 extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
216 int __advise) __THROW;
221 #if 0 /* && defined __UCLIBC_HAS_ADVANCED_REALTIME__ */
223 /* FIXME -- uClibc should probably implement these... */
225 /* Reserve storage for the data of the file associated with FD.
227 This function is a possible cancellation points and therefore not
228 marked with __THROW. */
229 # ifndef __USE_FILE_OFFSET64
230 extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
233 extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
237 # define posix_fallocate posix_fallocate64
240 # ifdef __USE_LARGEFILE64
241 extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);