xref: /illumos-gate/usr/src/lib/libnsl/nsl/t_close.c (revision 60405de4d8688d96dd05157c28db3ade5c9bc234)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 
23 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
24 /*	  All Rights Reserved  	*/
25 
26 /*
27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
28  * Use is subject to license terms.
29  */
30 
31 #pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.5 */
32 
33 #include "mt.h"
34 #include <errno.h>
35 #include <unistd.h>
36 #include <xti.h>
37 #include <signal.h>
38 #include <stropts.h>
39 #include "tx.h"
40 
41 int
42 _tx_close(int fd, int api_semantics)
43 {
44 	sigset_t mask;
45 	int sv_errno;
46 
47 	if (_t_checkfd(fd, 0, api_semantics) == NULL)
48 		return (-1);
49 
50 	(void) thr_sigsetmask(SIG_SETMASK, &fillset, &mask);
51 	sig_mutex_lock(&_ti_userlock);
52 	if (_t_delete_tilink(fd) < 0) {
53 		sv_errno = errno;
54 		sig_mutex_unlock(&_ti_userlock);
55 		(void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
56 		errno = sv_errno;
57 		return (-1);
58 	}
59 	/*
60 	 * Note: close() needs to be inside the lock. If done
61 	 * outside, another process may inherit the desriptor
62 	 * and recreate library level instance structures
63 	 */
64 	(void) close(fd);
65 
66 	sig_mutex_unlock(&_ti_userlock);
67 	(void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
68 	return (0);
69 }
70