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[glibc.git] / misc / sys / file.h
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1 /* Copyright (C) 1991, 92, 96, 97, 98, 99 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, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #ifndef _SYS_FILE_H
20 #define _SYS_FILE_H 1
22 #include <features.h>
24 #ifndef _FCNTL_H
25 # include <fcntl.h>
26 #endif
28 __BEGIN_DECLS
31 /* Alternate names for values for the WHENCE argument to `lseek'.
32 These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively. */
33 #ifndef L_SET
34 # define L_SET 0 /* Seek from beginning of file. */
35 # define L_INCR 1 /* Seek from current position. */
36 # define L_XTND 2 /* Seek from end of file. */
37 #endif
40 /* Operations for the `flock' call. */
41 #define LOCK_SH 1 /* Shared lock. */
42 #define LOCK_EX 2 /* Exclusive lock. */
43 #define LOCK_UN 8 /* Unlock. */
45 /* Can be OR'd in to one of the above. */
46 #define LOCK_NB 4 /* Don't block when locking. */
49 /* Apply or remove an advisory lock, according to OPERATION,
50 on the file FD refers to. */
51 extern int flock (int __fd, int __operation) __THROW;
54 __END_DECLS
56 #endif /* sys/file.h */