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glibc  2.9
file.h
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00001 /* Copyright (C) 1991, 92, 96, 97, 98, 99 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #ifndef       _SYS_FILE_H
00020 #define       _SYS_FILE_H   1
00021 
00022 #include <features.h>
00023 
00024 #ifndef       _FCNTL_H
00025 # include <fcntl.h>
00026 #endif
00027 
00028 __BEGIN_DECLS
00029 
00030 
00031 /* Alternate names for values for the WHENCE argument to `lseek'.
00032    These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively.  */
00033 #ifndef L_SET
00034 # define L_SET       0      /* Seek from beginning of file.  */
00035 # define L_INCR      1      /* Seek from current position.  */
00036 # define L_XTND      2      /* Seek from end of file.  */
00037 #endif
00038 
00039 
00040 /* Operations for the `flock' call.  */
00041 #define       LOCK_SH       1      /* Shared lock.  */
00042 #define       LOCK_EX       2      /* Exclusive lock.  */
00043 #define       LOCK_UN       8      /* Unlock.  */
00044 
00045 /* Can be OR'd in to one of the above.  */
00046 #define       LOCK_NB       4      /* Don't block when locking.  */
00047 
00048 
00049 /* Apply or remove an advisory lock, according to OPERATION,
00050    on the file FD refers to.  */
00051 extern int flock (int __fd, int __operation) __THROW;
00052 
00053 
00054 __END_DECLS
00055 
00056 #endif /* sys/file.h  */