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, ...);
78 libc_hidden_proto(fcntl)
81 extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
83 # define fcntl fcntl64
86 #if defined(__USE_LARGEFILE64) && !defined(__LP64__)
87 extern int fcntl64 (int __fd, int __cmd, ...);
88 libc_hidden_proto(fcntl64)
91 /* Open FILE and return a new file descriptor for it, or -1 on error.
92 OFLAG determines the type of access used. If O_CREAT is on OFLAG,
93 the third argument is taken as a `mode_t', the mode of the created file.
95 This function is a cancellation point and therefore not marked with
97 #ifndef __USE_FILE_OFFSET64
98 extern int open (__const char *__file, int __oflag, ...) __nonnull ((1));
99 libc_hidden_proto(open)
102 extern int __REDIRECT (open, (__const char *__file, int __oflag, ...), open64)
108 #ifdef __USE_LARGEFILE64
109 extern int open64 (__const char *__file, int __oflag, ...) __nonnull ((1));
110 libc_hidden_proto(open64)
114 /* Similar to `open' but a relative path name is interpreted relative to
115 the directory for which FD is a descriptor.
117 NOTE: some other `openat' implementation support additional functionality
118 through this interface, especially using the O_XATTR flag. This is not
121 This function is a cancellation point and therefore not marked with
123 # ifndef __USE_FILE_OFFSET64
124 extern int openat (int __fd, __const char *__file, int __oflag, ...)
126 libc_hidden_proto(openat)
129 extern int __REDIRECT (openat, (int __fd, __const char *__file, int __oflag,
130 ...), openat64) __nonnull ((2));
132 # define openat openat64
136 extern int openat64 (int __fd, __const char *__file, int __oflag, ...)
138 libc_hidden_proto(openat64)
141 /* Create and open FILE, with mode MODE. This takes an `int' MODE
142 argument because that is what `mode_t' will be widened to.
144 This function is a cancellation point and therefore not marked with
146 #ifndef __USE_FILE_OFFSET64
147 extern int creat (__const char *__file, __mode_t __mode) __nonnull ((1));
150 extern int __REDIRECT (creat, (__const char *__file, __mode_t __mode),
151 creat64) __nonnull ((1));
153 # define creat creat64
156 #ifdef __USE_LARGEFILE64
157 extern int creat64 (__const char *__file, __mode_t __mode) __nonnull ((1));
160 #if !defined F_LOCK && (defined __USE_MISC || (defined __USE_XOPEN_EXTENDED \
161 && !defined __USE_POSIX))
162 /* NOTE: These declarations also appear in <unistd.h>; be sure to keep both
163 files consistent. Some systems have them there and some here, and some
164 software depends on the macros being defined without including both. */
166 /* `lockf' is a simpler interface to the locking facilities of `fcntl'.
167 LEN is always relative to the current file position.
168 The CMD argument is one of the following. */
170 # define F_ULOCK 0 /* Unlock a previously locked region. */
171 # define F_LOCK 1 /* Lock a region for exclusive use. */
172 # define F_TLOCK 2 /* Test and lock a region for exclusive use. */
173 # define F_TEST 3 /* Test a region for other processes locks. */
175 # ifndef __USE_FILE_OFFSET64
176 extern int lockf (int __fd, int __cmd, __off_t __len);
177 libc_hidden_proto(lockf)
180 extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), lockf64);
182 # define lockf lockf64
185 # ifdef __USE_LARGEFILE64
186 extern int lockf64 (int __fd, int __cmd, __off64_t __len);
187 libc_hidden_proto(lockf64)
191 #if defined __USE_XOPEN2K && defined __UCLIBC_HAS_ADVANCED_REALTIME__
192 /* Advice the system about the expected behaviour of the application with
193 respect to the file associated with FD. */
194 # ifndef __USE_FILE_OFFSET64
195 extern int posix_fadvise (int __fd, __off_t __offset, __off_t __len,
196 int __advise) __THROW;
198 # ifdef __REDIRECT_NTH
199 extern int __REDIRECT_NTH (posix_fadvise, (int __fd, __off64_t __offset,
200 __off64_t __len, int __advise),
203 # define posix_fadvise posix_fadvise64
206 # ifdef __USE_LARGEFILE64
207 extern int posix_fadvise64 (int __fd, __off64_t __offset, __off64_t __len,
208 int __advise) __THROW;
213 #if 0 /* && defined __UCLIBC_HAS_ADVANCED_REALTIME__ */
215 /* FIXME -- uClibc should probably implement these... */
217 /* Reserve storage for the data of the file associated with FD.
219 This function is a possible cancellation points and therefore not
220 marked with __THROW. */
221 # ifndef __USE_FILE_OFFSET64
222 extern int posix_fallocate (int __fd, __off_t __offset, __off_t __len);
225 extern int __REDIRECT (posix_fallocate, (int __fd, __off64_t __offset,
229 # define posix_fallocate posix_fallocate64
232 # ifdef __USE_LARGEFILE64
233 extern int posix_fallocate64 (int __fd, __off64_t __offset, __off64_t __len);
237 extern int __fcntl_nocancel (int fd, int cmd, ...);