usr/src/lib/libc/port/nsl/t_snddis.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 1.4.3.1 */
  32
  33 #include "mt.h"
  34 #include <errno.h>
  35 #include <unistd.h>
  36 #include <stropts.h>
  37 #include <sys/stream.h>
  38 #define _SUN_TPI_VERSION 2
  39 #include <sys/tihdr.h>
  40 #include <sys/timod.h>
  41 #include <xti.h>
  42 #include <signal.h>
  43 #include <syslog.h>
  44 #include "tx.h"
  45
  46 int
  47 _tx_snddis(int fd, const struct t_call *call, int api_semantics)
  48 {
  49         struct T_discon_req dreq;
  50         struct strbuf ctlbuf;
  51         struct strbuf databuf;
  52         struct _ti_user *tiptr;
  53         int sv_errno;
  54         int retval;
  55
  56         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
  57                 return (-1);
  58         sig_mutex_lock(&tiptr->ti_lock);
  59
  60         if (tiptr->ti_servtype == T_CLTS) {
  61                 t_errno = TNOTSUPPORT;
  62                 sig_mutex_unlock(&tiptr->ti_lock);
  63                 return (-1);
  64         }
  65
  66         if (_T_IS_XTI(api_semantics)) {
  67                 /*
  68                  * User level state verification only done for XTI
  69                  * because doing for TLI may break existing applications
  70                  * Note: This is documented in TLI man page but never
  71                  * done.
  72                  */
  73                 if (!(tiptr->ti_state == T_DATAXFER ||
  74                     tiptr->ti_state == T_OUTCON ||
  75                     tiptr->ti_state == T_OUTREL ||
  76                     tiptr->ti_state == T_INREL ||
  77                     (tiptr->ti_state == T_INCON && tiptr->ti_ocnt > 0))) {
  78                         t_errno = TOUTSTATE;
  79                         sig_mutex_unlock(&tiptr->ti_lock);
  80                         return (-1);
  81                 }
  82
  83                 /*
  84                  * Following check only done for XTI as it may be a risk
  85                  * to existing buggy TLI applications.
  86                  */
  87         }
  88
  89         if (call != NULL && call->udata.len) {
  90                 if ((tiptr->ti_ddatasize == T_INVALID /* -2 */) ||
  91                     ((tiptr->ti_ddatasize != T_INFINITE /* -1*/) &&
  92                         (call->udata.len >
  93                             (uint32_t)tiptr->ti_ddatasize))) {
  94                         /*
  95                          * user data not valid with disconnect or it
  96                          * exceeds the limits specified by the
  97                          * transport provider
  98                          */
  99                         t_errno = TBADDATA;
 100                         sig_mutex_unlock(&tiptr->ti_lock);
 101                         return (-1);
 102                 }
 103         }
 104
 105         /*
 106          * If disconnect is done on a listener, the 'call' parameter
 107          * must be non-null
 108          */
 109         if ((tiptr->ti_state == T_INCON) &&
 110             (call == NULL)) {
 111                 t_errno = TBADSEQ;
 112                 sig_mutex_unlock(&tiptr->ti_lock);
 113                 return (-1);
 114         }
 115
 116         /*
 117          * look at look buffer to see if there is a discon there
 118          */
 119
 120         if (_t_look_locked(fd, tiptr, 0, api_semantics) == T_DISCONNECT) {
 121                 t_errno = TLOOK;
 122                 sig_mutex_unlock(&tiptr->ti_lock);
 123                 return (-1);
 124         }
 125
 126         if ((tiptr->ti_lookcnt > 0) && (call == 0))
 127                 _t_flush_lookevents(tiptr); /* flush but not on listener */
 128
 129         do {
 130                 retval = ioctl(fd, I_FLUSH, FLUSHW);
 131         } while (retval < 0 && errno == EINTR);
 132         if (retval < 0) {
 133                 sv_errno = errno;
 134                 t_errno = TSYSERR;
 135                 sig_mutex_unlock(&tiptr->ti_lock);
 136                 errno = sv_errno;
 137                 return (-1);
 138         }
 139
 140         ctlbuf.len = (int)sizeof (struct T_discon_req);
 141         ctlbuf.maxlen = (int)sizeof (struct T_discon_req);
 142         ctlbuf.buf = (char *)&dreq;
 143
 144         dreq.PRIM_type = T_DISCON_REQ;
 145         dreq.SEQ_number = (call? call->sequence: -1);
 146
 147         databuf.maxlen = (call? call->udata.len: 0);
 148         databuf.len = (call? call->udata.len: 0);
 149         databuf.buf = (call? call->udata.buf: NULL);
 150
 151         /*
 152          * Calls to send data (write or putmsg) can potentially
 153          * block, for MT case, we drop the lock and enable signals here
 154          * and acquire it back
 155          */
 156         sig_mutex_unlock(&tiptr->ti_lock);
 157         if (putmsg(fd, &ctlbuf, (databuf.len? &databuf: NULL), 0) < 0) {
 158                 t_errno = TSYSERR;
 159                 return (-1);
 160         }
 161         sig_mutex_lock(&tiptr->ti_lock);
 162
 163         if (_t_is_ok(fd, tiptr, T_DISCON_REQ) < 0) {
 164                 sv_errno = errno;
 165                 sig_mutex_unlock(&tiptr->ti_lock);
 166                 errno = sv_errno;
 167                 return (-1);
 168         }
 169
 170         tiptr->ti_flags &= ~(MORE|EXPEDITED);
 171
 172         if (tiptr->ti_ocnt <= 1) {
 173                 if (tiptr->ti_state == T_INCON) {
 174                         tiptr->ti_ocnt--;
 175                         tiptr->ti_flags &= ~TX_TQFULL_NOTIFIED;
 176                 }
 177                 _T_TX_NEXTSTATE(T_SNDDIS1, tiptr,
 178                                 "t_snddis: invalid state event T_SNDDIS1");
 179         } else {
 180                 if (tiptr->ti_state == T_INCON) {
 181                         tiptr->ti_ocnt--;
 182                         tiptr->ti_flags &= ~TX_TQFULL_NOTIFIED;
 183                 }
 184                 _T_TX_NEXTSTATE(T_SNDDIS2, tiptr,
 185                                 "t_snddis: invalid state event T_SNDDIS2");
 186         }
 187
 188         sig_mutex_unlock(&tiptr->ti_lock);
 189         return (0);
 190 }