xref: /illumos-gate/usr/src/lib/libc/port/stdio/flockf.c (revision 1da57d55)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5a574db85Sraf  * Common Development and Distribution License (the "License").
6a574db85Sraf  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
21a574db85Sraf 
227c478bd9Sstevel@tonic-gate /*
23a574db85Sraf  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
247c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate  */
267c478bd9Sstevel@tonic-gate 
277c478bd9Sstevel@tonic-gate /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
287c478bd9Sstevel@tonic-gate /* All Rights Reserved */
297c478bd9Sstevel@tonic-gate 
30*7257d1b4Sraf #include "lint.h"
317c478bd9Sstevel@tonic-gate #include "mtlib.h"
327c478bd9Sstevel@tonic-gate #include "file64.h"
337c478bd9Sstevel@tonic-gate #include <stdio.h>
347c478bd9Sstevel@tonic-gate #include <thread.h>
357c478bd9Sstevel@tonic-gate #include <synch.h>
367c478bd9Sstevel@tonic-gate #include <stdlib.h>
377c478bd9Sstevel@tonic-gate #include <errno.h>
387c478bd9Sstevel@tonic-gate #include <stdio_ext.h>
397c478bd9Sstevel@tonic-gate #include "stdiom.h"
407c478bd9Sstevel@tonic-gate 
41*7257d1b4Sraf #define	_iob	__iob
42*7257d1b4Sraf 
437c478bd9Sstevel@tonic-gate /*
44a574db85Sraf  * _flockget and _flockrel are only called by the
45a574db85Sraf  * FLOCKFILE/FUNLOCKFILE macros in mtlib.h.
467c478bd9Sstevel@tonic-gate  */
477c478bd9Sstevel@tonic-gate 
487c478bd9Sstevel@tonic-gate /*
497c478bd9Sstevel@tonic-gate  * compute the lock's position, acquire it and return its pointer
507c478bd9Sstevel@tonic-gate  */
517c478bd9Sstevel@tonic-gate 
527c478bd9Sstevel@tonic-gate rmutex_t *
_flockget(FILE * iop)537c478bd9Sstevel@tonic-gate _flockget(FILE *iop)
547c478bd9Sstevel@tonic-gate {
557c478bd9Sstevel@tonic-gate 	rmutex_t *rl = IOB_LCK(iop);
567c478bd9Sstevel@tonic-gate 
577c478bd9Sstevel@tonic-gate 	if (rl != NULL)
58a574db85Sraf 		cancel_safe_mutex_lock(rl);
597c478bd9Sstevel@tonic-gate 	return (rl);
607c478bd9Sstevel@tonic-gate }
617c478bd9Sstevel@tonic-gate 
627c478bd9Sstevel@tonic-gate int
ftrylockfile(FILE * iop)637c478bd9Sstevel@tonic-gate ftrylockfile(FILE *iop)
647c478bd9Sstevel@tonic-gate {
657c478bd9Sstevel@tonic-gate 	rmutex_t *rl = IOB_LCK(iop);
667c478bd9Sstevel@tonic-gate 
677c478bd9Sstevel@tonic-gate 	if (rl != NULL)
688cd45542Sraf 		return (mutex_trylock(rl));
697c478bd9Sstevel@tonic-gate 	return (0);	/* can't happen? */
707c478bd9Sstevel@tonic-gate }
717c478bd9Sstevel@tonic-gate 
727c478bd9Sstevel@tonic-gate void
flockfile(FILE * iop)737c478bd9Sstevel@tonic-gate flockfile(FILE *iop)
747c478bd9Sstevel@tonic-gate {
757c478bd9Sstevel@tonic-gate 	rmutex_t *rl = IOB_LCK(iop);
767c478bd9Sstevel@tonic-gate 
777c478bd9Sstevel@tonic-gate 	if (rl != NULL)
78*7257d1b4Sraf 		(void) mutex_lock(rl);
797c478bd9Sstevel@tonic-gate }
807c478bd9Sstevel@tonic-gate 
817c478bd9Sstevel@tonic-gate void
funlockfile(FILE * iop)827c478bd9Sstevel@tonic-gate funlockfile(FILE *iop)
837c478bd9Sstevel@tonic-gate {
847c478bd9Sstevel@tonic-gate 	rmutex_t *rl = IOB_LCK(iop);
857c478bd9Sstevel@tonic-gate 
867c478bd9Sstevel@tonic-gate 	if (rl != NULL)
87*7257d1b4Sraf 		(void) mutex_unlock(rl);
887c478bd9Sstevel@tonic-gate }
897c478bd9Sstevel@tonic-gate 
907c478bd9Sstevel@tonic-gate int
__fsetlocking(FILE * iop,int type)917c478bd9Sstevel@tonic-gate __fsetlocking(FILE *iop, int type)
927c478bd9Sstevel@tonic-gate {
937c478bd9Sstevel@tonic-gate 	int	ret = 0;
947c478bd9Sstevel@tonic-gate 
957c478bd9Sstevel@tonic-gate 	ret = GET_IONOLOCK(iop) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
967c478bd9Sstevel@tonic-gate 
977c478bd9Sstevel@tonic-gate 	switch (type) {
987c478bd9Sstevel@tonic-gate 
997c478bd9Sstevel@tonic-gate 	case FSETLOCKING_QUERY:
1007c478bd9Sstevel@tonic-gate 		break;
1017c478bd9Sstevel@tonic-gate 
1027c478bd9Sstevel@tonic-gate 	case FSETLOCKING_INTERNAL:
1037c478bd9Sstevel@tonic-gate 		CLEAR_IONOLOCK(iop);
1047c478bd9Sstevel@tonic-gate 		break;
1057c478bd9Sstevel@tonic-gate 
1067c478bd9Sstevel@tonic-gate 	case FSETLOCKING_BYCALLER:
1077c478bd9Sstevel@tonic-gate 		SET_IONOLOCK(iop);
1087c478bd9Sstevel@tonic-gate 		break;
1097c478bd9Sstevel@tonic-gate 
1107c478bd9Sstevel@tonic-gate 	default:
1117c478bd9Sstevel@tonic-gate 		errno = EINVAL;
1127c478bd9Sstevel@tonic-gate 		return (-1);
1137c478bd9Sstevel@tonic-gate 	}
1147c478bd9Sstevel@tonic-gate 
1157c478bd9Sstevel@tonic-gate 	return (ret);
1167c478bd9Sstevel@tonic-gate }
117