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File: [cvs.NetBSD.org] / src / lib / libc / gen / lockf.c (download)

Revision 1.4, Mon Jun 25 22:32:43 2012 UTC (21 months, 3 weeks ago) by abs
Branch: MAIN
CVS Tags: yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, agc-symver-base, agc-symver, HEAD
Changes since 1.3: +3 -6 lines

Update old-style definitions to ANSI, remove a couple of register
definitions along the way. Fixed gcc 4.1 build (thank you vax)

/*	$NetBSD: lockf.c,v 1.4 2012/06/25 22:32:43 abs Exp $	*/

/*-
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Klaus Klein.
 *
 * 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.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: lockf.c,v 1.4 2012/06/25 22:32:43 abs Exp $");
#endif

#include "namespace.h"
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>

#ifdef __weak_alias
__weak_alias(lockf,_lockf)
#endif


int
lockf(int filedes, int function, off_t size)
{
	struct flock fl;
	int cmd;

	fl.l_start = 0;
	fl.l_len = size;
	fl.l_whence = SEEK_CUR;

	switch (function) {
	case F_ULOCK:
		cmd = F_SETLK;
		fl.l_type = F_UNLCK;
		break;
	case F_LOCK:
		cmd = F_SETLKW;
		fl.l_type = F_WRLCK;
		break;
	case F_TLOCK:
		cmd = F_SETLK;
		fl.l_type = F_WRLCK;
		break;
	case F_TEST:
		fl.l_type = F_WRLCK;
		if (fcntl(filedes, F_GETLK, &fl) == -1)
			return (-1);
		if (fl.l_type == F_UNLCK || fl.l_pid == getpid())
			return (0);
		errno = EAGAIN;
		return (-1);
		/* NOTREACHED */
	default:
		errno = EINVAL;
		return (-1);
		/* NOTREACHED */
	}

	return (fcntl(filedes, cmd, &fl));
}