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Commit	Line	Data
	1	/*-
	2	* Copyright (c) 1997 The NetBSD Foundation, Inc.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to The NetBSD Foundation
	6	* by Klaus Klein.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the NetBSD
	19	* Foundation, Inc. and its contributors.
	20	* 4. Neither the name of The NetBSD Foundation nor the names of its
	21	* contributors may be used to endorse or promote products derived
	22	* from this software without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
	25	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
	26	* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	27	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
	28	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	29	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	30	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	31	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	32	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	33	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	34	* POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	/* $NetBSD: lockf.c,v 1.1 1997/12/20 20:23:18 kleink Exp $ */
	38	#include <sys/cdefs.h>
	39	__FBSDID("$FreeBSD: src/lib/libc/gen/lockf.c,v 1.8 2002/02/01 00:57:29 obrien Exp $");
	40
	41	#ifdef VARIANT_CANCELABLE
	42	int __fcntl(int, int, void *);
	43	#else /* !VARIANT_CANCELABLE */
	44	int __fcntl_nocancel(int, int, void *);
	45	#endif /* VARIANT_CANCELABLE */
	46
	47
	48	#include "namespace.h"
	49	#include <errno.h>
	50	#include <fcntl.h>
	51	#include <unistd.h>
	52	#include "un-namespace.h"
	53
	54	int
	55	lockf(filedes, function, size)
	56	int filedes;
	57	int function;
	58	off_t size;
	59	{
	60	struct flock fl;
	61	int cmd;
	62
	63
	64	fl.l_start = 0;
	65	fl.l_len = size;
	66	fl.l_whence = SEEK_CUR;
	67
	68	switch (function) {
	69	case F_ULOCK:
	70	cmd = F_SETLK;
	71	fl.l_type = F_UNLCK;
	72	break;
	73	case F_LOCK:
	74	cmd = F_SETLKW;
	75	fl.l_type = F_WRLCK;
	76	break;
	77	case F_TLOCK:
	78	cmd = F_SETLK;
	79	fl.l_type = F_WRLCK;
	80	break;
	81	case F_TEST:
	82	fl.l_type = F_WRLCK;
	83	#ifdef VARIANT_CANCELABLE
	84	if (__fcntl(filedes, F_GETLK, &fl) == -1)
	85	return (-1);
	86	#else /* !VARIANT_CANCELABLE */
	87	if (__fcntl_nocancel(filedes, F_GETLK, &fl) == -1)
	88	return (-1);
	89	#endif /* VARIANT_CANCELABLE */
	90	if (fl.l_type == F_UNLCK \|\| fl.l_pid == getpid())
	91	return (0);
	92	errno = EAGAIN;
	93	return (-1);
	94	/* NOTREACHED */
	95	default:
	96	errno = EINVAL;
	97	return (-1);
	98	/* NOTREACHED */
	99	}
	100
	101	#ifdef VARIANT_CANCELABLE
	102	return (__fcntl(filedes, cmd, &fl));
	103	#else /* !VARIANT_CANCELABLE */
	104	return (__fcntl_nocancel(filedes, cmd, &fl));
	105	#endif /* VARIANT_CANCELABLE */
	106	}
	107