mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-12-22 18:02:20 +00:00
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/* $NetBSD: flock.c,v 1.6 2008/04/28 20:24:12 martin Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2001 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Todd Vierling.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Emulate flock() with fcntl(), where available.
|
|
* Otherwise, don't do locking; just pretend success.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#ifndef HAVE_FLOCK
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
|
|
int
|
|
flock(int fd, int op)
|
|
{
|
|
int rc = 0;
|
|
|
|
#if defined(F_SETLK) && defined(F_SETLKW)
|
|
struct flock fl = {0};
|
|
|
|
switch (op & (LOCK_EX|LOCK_SH|LOCK_UN)) {
|
|
case LOCK_EX:
|
|
fl.l_type = F_WRLCK;
|
|
break;
|
|
|
|
case LOCK_SH:
|
|
fl.l_type = F_RDLCK;
|
|
break;
|
|
|
|
case LOCK_UN:
|
|
fl.l_type = F_UNLCK;
|
|
break;
|
|
|
|
default:
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
fl.l_whence = SEEK_SET;
|
|
rc = fcntl(fd, op & LOCK_NB ? F_SETLK : F_SETLKW, &fl);
|
|
|
|
if (rc && (errno == EAGAIN))
|
|
errno = EWOULDBLOCK;
|
|
#else
|
|
rc = -1;
|
|
errno = ENOSYS;
|
|
#endif
|
|
|
|
return rc;
|
|
}
|
|
#endif
|