* sysdeps/s390/s390-32/elf/start.S: Replace pc relative relocation
[glibc.git] / io / fcntl.h
blob72a944b3d45ff07cf003ce956ebfe6ac5c043609
1 /* Copyright (C) 1991,1992,1994-2001,2003,2004,2005,2006
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
18 02111-1307 USA. */
21 * POSIX Standard: 6.5 File Control Operations <fcntl.h>
24 #ifndef _FCNTL_H
25 #define _FCNTL_H 1
27 #include <features.h>
29 /* This must be early so <bits/fcntl.h> can define types winningly. */
30 __BEGIN_DECLS
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. */
37 #ifdef __USE_XOPEN
38 # include <sys/stat.h>
39 #endif
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. */
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 */
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
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
75 __THROW. */
76 extern int fcntl (int __fd, int __cmd, ...);
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.
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
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.
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.
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
120 extern int openat64 (int __fd, __const char *__file, int __oflag, ...)
121 __nonnull ((2));
122 #endif
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.
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
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. */
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. */
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. */
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
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
193 /* Reserve storage for the data of the file associated with FD.
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
213 __END_DECLS
215 #endif /* fcntl.h */