2 * Amanda, The Advanced Maryland Automatic Network Disk Archiver
3 * Copyright (c) 1991-1998 University of Maryland at College Park
6 * Permission to use, copy, modify, distribute, and sell this software and its
7 * documentation for any purpose is hereby granted without fee, provided that
8 * the above copyright notice appear in all copies and that both that
9 * copyright notice and this permission notice appear in supporting
10 * documentation, and that the name of U.M. not be used in advertising or
11 * publicity pertaining to distribution of the software without specific,
12 * written prior permission. U.M. makes no representations about the
13 * suitability of this software for any purpose. It is provided "as is"
14 * without express or implied warranty.
16 * U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
18 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
20 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
21 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 * Authors: the Amanda Development Team. Its members are listed in a
24 * file named AUTHORS, in the root directory of this distribution.
27 /* moved from amflock.c by Dustin J. Mitchell <dustin@zmanda.com> */
31 /* XPG4-UNIX (eg, SGI IRIX, DEC DU) has F_ULOCK instead of F_UNLOCK */
32 #if defined(F_ULOCK) && !defined(F_UNLOCK)
33 # define F_UNLOCK F_ULOCK
39 G_GNUC_UNUSED char *resource)
41 return lockf(fd, F_LOCK, (off_t)0);
47 G_GNUC_UNUSED char *resource)
51 /* unlock from here on */
52 if (lockf(fd, F_UNLOCK, (off_t)0) == -1) return -1;
54 /* unlock from bof to here */
55 pos = lseek(fd, (off_t)0, SEEK_CUR);
56 if (pos == (off_t)-1) {
64 if (lockf(fd, F_UNLOCK, -pos) == -1)
71 amflock_impl_t amflock_lockf_impl = {
73 lockf_lock, /* no read-only support */