t_unbind.c revision 1219:f89f56c2d9ac 
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 2006 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 1.3.4.1 */
32
33#include "mt.h"
34#include <stdlib.h>
35#include <errno.h>
36#include <unistd.h>
37#include <sys/stropts.h>
38#include <sys/stream.h>
39#define	_SUN_TPI_VERSION 2
40#include <sys/tihdr.h>
41#include <sys/timod.h>
42#include <xti.h>
43#include <signal.h>
44#include <syslog.h>
45#include "tx.h"
46
47
48int
49_tx_unbind(int fd, int api_semantics)
50{
51	struct _ti_user *tiptr;
52	sigset_t mask;
53	int sv_errno, retval, didalloc;
54	struct strbuf ctlbuf;
55
56	if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
57		return (-1);
58
59	if (_T_IS_XTI(api_semantics)) {
60		/*
61		 * User level state verification only done for XTI
62		 * because doing for TLI may break existing applications
63		 */
64		if (tiptr->ti_state != T_IDLE) {
65			t_errno = TOUTSTATE;
66			return (-1);
67		}
68	}
69
70	/*
71	 * Since unbind is not an idempotent operation, we
72	 * block signals around the call.
73	 * Note that sig_mutex_lock() only defers signals, it does not
74	 * block them, so interruptible syscalls could still get EINTR.
75	 */
76	(void) thr_sigsetmask(SIG_SETMASK, &fillset, &mask);
77	sig_mutex_lock(&tiptr->ti_lock);
78	/*
79	 * Acquire buffer for use in sending/receiving the message.
80	 * Note: assumes (correctly) that ti_ctlsize is large enough
81	 * to hold sizeof (struct T_unbind_req/ack)
82	 */
83	if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
84		sv_errno = errno;
85		sig_mutex_unlock(&tiptr->ti_lock);
86		(void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
87		errno = sv_errno;
88		return (-1);
89	}
90
91	retval = _tx_unbind_locked(fd, tiptr, &ctlbuf);
92
93	sv_errno = errno;
94	if (didalloc)
95		free(ctlbuf.buf);
96	else
97		tiptr->ti_ctlbuf = ctlbuf.buf;
98	sig_mutex_unlock(&tiptr->ti_lock);
99	(void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
100	errno = sv_errno;
101	return (retval);
102}
103
104int
105_tx_unbind_locked(int fd, struct _ti_user *tiptr, struct strbuf *ctlbufp)
106{
107	struct T_unbind_req *unbind_reqp;
108	int retlen;
109
110	if (_t_is_event(fd, tiptr) < 0)
111		return (-1);
112
113	/* LINTED pointer cast */
114	unbind_reqp = (struct T_unbind_req *)ctlbufp->buf;
115	unbind_reqp->PRIM_type = T_UNBIND_REQ;
116
117	if (_t_do_ioctl(fd, (char *)unbind_reqp,
118	    (int)sizeof (struct T_unbind_req), TI_UNBIND, &retlen) < 0) {
119		goto err_out;
120	}
121
122	if (ioctl(fd, I_FLUSH, FLUSHRW) < 0) {
123		t_errno = TSYSERR;
124		goto err_out;
125	}
126
127	/*
128	 * clear more and expedited data bits
129	 */
130	tiptr->ti_flags &= ~(MORE|EXPEDITED);
131
132	_T_TX_NEXTSTATE(T_UNBIND, tiptr,
133			"t_unbind: invalid state event T_UNBIND");
134
135	return (0);
136
137err_out:
138	return (-1);
139}
140