1 /* Copyright (C) 1994, 1996, 1997, 1998, 2000 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
21 #include <sys/types.h>
26 #include <sys/syscall.h>
32 #define F_GETLK F_GETLK64
34 #define F_SETLK F_SETLK64
39 /* lockf is a simplified interface to fcntl's locking facilities. */
41 int lockf64 (int fd, int cmd, off64_t len64)
44 off_t len = (off_t) len64;
46 if (len64 != (off64_t) len)
48 /* We can't represent the length. */
49 __set_errno(EOVERFLOW);
53 memset((char *) &fl, '\0', sizeof (fl));
55 /* lockf is always relative to the current file position. */
56 fl.l_whence = SEEK_CUR;
63 /* Test the lock: return 0 if FD is unlocked or locked by this process;
64 return -1, set errno to EACCES, if another process holds the lock. */
66 if (fcntl (fd, F_GETLK, &fl) < 0)
68 if (fl.l_type == F_UNLCK || fl.l_pid == getpid ())
91 return fcntl(fd, cmd, &fl);
93 libc_hidden_def(lockf64)