usr/src/lib/libc/port/nsl/t_rcvrel.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 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 1.7.3.1 */
  32
  33 /*
  34  * t_rcvrel.c and t_rcvreldata.c are very similar and contain common code.
  35  * Any changes to either of them should be reviewed to see whether they
  36  * are applicable to the other file.
  37  */
  38 #include "mt.h"
  39 #include <stdlib.h>
  40 #include <errno.h>
  41 #include <stropts.h>
  42 #include <sys/stream.h>
  43 #define _SUN_TPI_VERSION 2
  44 #include <sys/tihdr.h>
  45 #include <sys/timod.h>
  46 #include <xti.h>
  47 #include <signal.h>
  48 #include <syslog.h>
  49 #include "tx.h"
  50
  51 int
  52 _tx_rcvrel(int fd, int api_semantics)
  53 {
  54         struct strbuf ctlbuf;
  55         struct strbuf databuf;
  56         int retval;
  57         union T_primitives *pptr;
  58         struct _ti_user *tiptr;
  59         int sv_errno;
  60         int didalloc, didralloc;
  61
  62         int flg = 0;
  63
  64         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
  65                 return (-1);
  66         sig_mutex_lock(&tiptr->ti_lock);
  67
  68         if (tiptr->ti_servtype != T_COTS_ORD) {
  69                 t_errno = TNOTSUPPORT;
  70                 sig_mutex_unlock(&tiptr->ti_lock);
  71                 return (-1);
  72         }
  73
  74         if (_T_IS_XTI(api_semantics)) {
  75                 /*
  76                  * User level state verification only done for XTI
  77                  * because doing for TLI may break existing applications
  78                  */
  79                 if (!(tiptr->ti_state == T_DATAXFER ||
  80                     tiptr->ti_state == T_OUTREL)) {
  81                         t_errno = TOUTSTATE;
  82                         sig_mutex_unlock(&tiptr->ti_lock);
  83                         return (-1);
  84                 }
  85         }
  86
  87         if ((retval = _t_look_locked(fd, tiptr, 0, api_semantics)) < 0) {
  88                 sv_errno = errno;
  89                 sig_mutex_unlock(&tiptr->ti_lock);
  90                 errno = sv_errno;
  91                 return (-1);
  92         }
  93
  94         if (retval == T_DISCONNECT) {
  95                 /*
  96                  * This ensures preference to T_DISCON_IND which is
  97                  * the design model for TPI
  98                  */
  99                 t_errno = TLOOK;
 100                 sig_mutex_unlock(&tiptr->ti_lock);
 101                 return (-1);
 102         }
 103
 104         if ((tiptr->ti_lookcnt > 0) &&
 105             /* LINTED pointer cast */
 106             (*((t_scalar_t *)tiptr->ti_lookbufs.tl_lookcbuf) == T_ORDREL_IND)) {
 107                 /*
 108                  * Current look buffer event is T_ORDREL_IND.
 109                  * Remove it from look buffer event list.
 110                  */
 111                 _t_free_looklist_head(tiptr);
 112                 _T_TX_NEXTSTATE(T_RCVREL, tiptr,
 113                                         "t_rcv: invalid state event T_RCVREL");
 114                 sig_mutex_unlock(&tiptr->ti_lock);
 115                 return (0);
 116         } else {
 117                 if (retval != T_ORDREL) {
 118                         t_errno = TNOREL;
 119                         sig_mutex_unlock(&tiptr->ti_lock);
 120                         return (-1);
 121                 }
 122         }
 123
 124         /*
 125          * get ordrel off read queue.
 126          * use ctl and rcv buffers
 127          *
 128          * Acquire ctlbuf for use in sending/receiving control part
 129          * of the message.
 130          */
 131         if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
 132                 sv_errno = errno;
 133                 sig_mutex_unlock(&tiptr->ti_lock);
 134                 errno = sv_errno;
 135                 return (-1);
 136         }
 137
 138         /*
 139          * Acquire databuf for use in sending/receiving data part
 140          */
 141         if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0) {
 142                 sv_errno = errno;
 143                 if (didalloc)
 144                         free(ctlbuf.buf);
 145                 else
 146                         tiptr->ti_ctlbuf = ctlbuf.buf;
 147                 sig_mutex_unlock(&tiptr->ti_lock);
 148                 errno = sv_errno;
 149                 return (-1);
 150         }
 151
 152         /*
 153          * Since we have verified above that an orderly release event
 154          * is pending on this endpoint, we assume that this getmsg()
 155          * cannot block forever.
 156          */
 157         do {
 158                 retval = getmsg(fd, &ctlbuf, &databuf, &flg);
 159         } while (retval < 0 && errno == EINTR);
 160
 161         if (retval < 0) {
 162                 t_errno = TSYSERR;
 163                 goto err_out;
 164         }
 165
 166         /*
 167          * did I get entire message?
 168          */
 169         if (retval > 0) {
 170                 t_errno = TSYSERR;
 171                 errno = EIO;
 172                 goto err_out;
 173         }
 174         /* LINTED pointer cast */
 175         pptr = (union T_primitives *)ctlbuf.buf;
 176
 177         if (ctlbuf.len < (int)sizeof (struct T_ordrel_ind)) {
 178                 t_errno = TSYSERR;
 179                 errno = EPROTO;
 180                 goto err_out;
 181         }
 182         if (pptr->type != T_ORDREL_IND) {
 183                 if (pptr->type == T_DISCON_IND) {
 184                         /*
 185                          * T_DISCON_IND gets priority following
 186                          * TPI design philosphy.
 187                          *
 188                          * Add it to the events in the "look buffer"
 189                          * list of events. This routine may defer signals.
 190                          */
 191                         if (_t_register_lookevent(tiptr, databuf.buf,
 192                                                 databuf.len, ctlbuf.buf,
 193                                                 ctlbuf.len) < 0) {
 194                                 t_errno = TSYSERR;
 195                                 errno = ENOMEM;
 196                                 goto err_out;
 197                         }
 198                         t_errno = TLOOK;
 199                         goto err_out;
 200                 } else {
 201                         t_errno = TSYSERR;
 202                         errno = EPROTO;
 203                         goto err_out;
 204                 }
 205         }
 206
 207         _T_TX_NEXTSTATE(T_RCVREL, tiptr,
 208                         "t_rcvrel: invalid state event T_RCVREL");
 209
 210         if (didalloc)
 211                 free(ctlbuf.buf);
 212         else
 213                 tiptr->ti_ctlbuf = ctlbuf.buf;
 214         if (didralloc)
 215                 free(databuf.buf);
 216         else
 217                 tiptr->ti_rcvbuf = databuf.buf;
 218         sig_mutex_unlock(&tiptr->ti_lock);
 219         return (0);
 220
 221 err_out:
 222         sv_errno = errno;
 223
 224         if (didalloc)
 225                 free(ctlbuf.buf);
 226         else
 227                 tiptr->ti_ctlbuf = ctlbuf.buf;
 228         if (didralloc)
 229                 free(databuf.buf);
 230         else
 231                 tiptr->ti_rcvbuf = databuf.buf;
 232         sig_mutex_unlock(&tiptr->ti_lock);
 233         errno = sv_errno;
 234         return (-1);
 235 }