usr/src/lib/libc/port/nsl/t_unbind.c

   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
  48 int
  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
 104 int
 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
 137 err_out:
 138         return (-1);
 139 }