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01: /* Copyright (C) 1991, 92, 96, 97, 98, 99 Free Software Foundation, Inc.
02:    This file is part of the GNU C Library.
03: 
04:    The GNU C Library is free software; you can redistribute it and/or
05:    modify it under the terms of the GNU Lesser General Public
06:    License as published by the Free Software Foundation; either
07:    version 2.1 of the License, or (at your option) any later version.
08: 
09:    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.
13: 
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.  */
18: 
19: #ifndef _SYS_FILE_H
20: #define _SYS_FILE_H     1
21: 
22: #include <features.h>
23: 
24: #ifndef _FCNTL_H
25: # include <fcntl.h>
26: #endif
27: 
28: __BEGIN_DECLS
29: 
30: 
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
38: 
39: 
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.  */
44: 
45: /* Can be OR'd in to one of the above.  */
46: #define LOCK_NB 4       /* Don't block when locking.  */
47: 
48: 
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;
52: 
53: 
54: __END_DECLS
55: 
56: #endif /* sys/file.h  */
57: 

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