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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /misc/sys/file.h
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initial import
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+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#ifndef _SYS_FILE_H
+
+#define _SYS_FILE_H 1
+#include <features.h>
+
+#ifndef _FCNTL_H
+#include <fcntl.h>
+#endif
+
+__BEGIN_DECLS
+
+
+/* Alternate names for values for the WHENCE argument to `lseek'.
+ These are the same as SEEK_SET, SEEK_CUR, and SEEK_END, respectively. */
+#define L_SET 0 /* Seek from beginning of file. */
+#define L_INCR 1 /* Seek from current position. */
+#define L_XTND 2 /* Seek from end of file. */
+
+
+/* Operations for the `flock' call. */
+#define LOCK_SH 1 /* Shared lock. */
+#define LOCK_EX 2 /* Exclusive lock. */
+#define LOCK_UN 8 /* Unlock. */
+
+/* Can be OR'd in to one of the above. */
+#define LOCK_NB 4 /* Don't block when locking. */
+
+
+/* Apply or remove an advisory lock, according to OPERATION,
+ on the file FD refers to. */
+extern int __flock __P ((int __fd, int __operation));
+extern int flock __P ((int __fd, int __operation));
+
+
+__END_DECLS
+
+#endif /* sys/file.h */