usr/src/lib/libc/port/nsl/t_rcvreldata.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 /*
  24  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  25  * Use is subject to license terms.
  26  */
  27
  28 #pragma ident   "%Z%%M% %I%     %E% SMI"
  29
  30 /*
  31  * t_rcvrel.c and t_rcvreldata.c are very similar and contain common code.
  32  * Any changes to either of them should be reviewed to see whether they
  33  * are applicable to the other file.
  34  */
  35 #include "mt.h"
  36 #include <stdlib.h>
  37 #include <errno.h>
  38 #include <stropts.h>
  39 #include <sys/stream.h>
  40 #define _SUN_TPI_VERSION 2
  41 #include <sys/tihdr.h>
  42 #include <sys/timod.h>
  43 #include <xti.h>
  44 #include <signal.h>
  45 #include <syslog.h>
  46 #include <assert.h>
  47 #include "tx.h"
  48
  49 /* ARGSUSED */
  50 int
  51 _tx_rcvreldata(int fd, struct t_discon *discon, int api_semantics)
  52 {
  53         struct strbuf ctlbuf;
  54         struct strbuf databuf;
  55         int retval;
  56         union T_primitives *pptr;
  57         struct _ti_user *tiptr;
  58         int sv_errno;
  59         int didalloc, didralloc;
  60
  61         int flg = 0;
  62
  63
  64         assert(api_semantics == TX_XTI_XNS5_API);
  65         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
  66                 return (-1);
  67         sig_mutex_lock(&tiptr->ti_lock);
  68
  69         if (tiptr->ti_servtype != T_COTS_ORD) {
  70                 t_errno = TNOTSUPPORT;
  71                 sig_mutex_unlock(&tiptr->ti_lock);
  72                 return (-1);
  73         }
  74
  75         if (!(tiptr->ti_state == T_DATAXFER ||
  76             tiptr->ti_state == T_OUTREL)) {
  77                 t_errno = TOUTSTATE;
  78                 sig_mutex_unlock(&tiptr->ti_lock);
  79                 return (-1);
  80         }
  81
  82         if ((retval = _t_look_locked(fd, tiptr, 0, api_semantics)) < 0) {
  83                 sv_errno = errno;
  84                 sig_mutex_unlock(&tiptr->ti_lock);
  85                 errno = sv_errno;
  86                 return (-1);
  87         }
  88
  89         if (retval == T_DISCONNECT) {
  90                 /*
  91                  * This ensures preference to T_DISCON_IND which is
  92                  * the design model for TPI
  93                  */
  94                 t_errno = TLOOK;
  95                 sig_mutex_unlock(&tiptr->ti_lock);
  96                 return (-1);
  97         }
  98
  99         /*
 100          * Someday there could be transport providers that support T_ORDRELDATA
 101          * Until then this function behaves the same as t_rcvrel()
 102          * Note: Currently only mOSI ("minimal OSI") provider is specified
 103          * to use T_ORDRELDATA so probability of needing it is minimal.
 104          */
 105
 106         if ((tiptr->ti_lookcnt > 0) &&
 107             /* LINTED pointer cast */
 108             (*((t_scalar_t *)tiptr->ti_lookbufs.tl_lookcbuf) == T_ORDREL_IND)) {
 109                 /*
 110                  * Current look buffer event is T_ORDREL_IND.
 111                  * Remove it from look buffer event list.
 112                  */
 113                 _t_free_looklist_head(tiptr);
 114                 _T_TX_NEXTSTATE(T_RCVREL, tiptr,
 115                         "t_rcvreldata: invalid state event T_RCVREL");
 116                 sig_mutex_unlock(&tiptr->ti_lock);
 117                 return (0);
 118         } else {
 119                 if (retval != T_ORDREL) {
 120                         t_errno = TNOREL;
 121                         sig_mutex_unlock(&tiptr->ti_lock);
 122                         return (-1);
 123                 }
 124         }
 125
 126         /*
 127          * get ordrel off read queue.
 128          * use ctl and rcv buffers
 129          *
 130          * Acquire ctlbuf for use in sending/receiving control part
 131          * of the message.
 132          */
 133         if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
 134                 sv_errno = errno;
 135                 sig_mutex_unlock(&tiptr->ti_lock);
 136                 errno = sv_errno;
 137                 return (-1);
 138         }
 139
 140         /*
 141          * Acquire databuf for use in sending/receiving data part
 142          */
 143         if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0) {
 144                 sv_errno = errno;
 145                 if (didalloc)
 146                         free(ctlbuf.buf);
 147                 else
 148                         tiptr->ti_ctlbuf = ctlbuf.buf;
 149                 sig_mutex_unlock(&tiptr->ti_lock);
 150                 errno = sv_errno;
 151                 return (-1);
 152         }
 153
 154         /*
 155          * Since we have verified above that an orderly release event
 156          * is pending on this endpoint, we assume that this getmsg()
 157          * cannot block forever.
 158          */
 159         do {
 160                 retval = getmsg(fd, &ctlbuf, &databuf, &flg);
 161         } while (retval < 0 && errno == EINTR);
 162
 163         if (retval < 0) {
 164                 t_errno = TSYSERR;
 165                 goto err_out;
 166         }
 167
 168         /*
 169          * did I get entire message?
 170          */
 171         if (retval > 0) {
 172                 t_errno = TSYSERR;
 173                 errno = EIO;
 174                 goto err_out;
 175         }
 176         /* LINTED pointer cast */
 177         pptr = (union T_primitives *)ctlbuf.buf;
 178
 179         if (ctlbuf.len < (int)sizeof (struct T_ordrel_ind)) {
 180                 t_errno = TSYSERR;
 181                 errno = EPROTO;
 182                 goto err_out;
 183         }
 184         if (pptr->type != T_ORDREL_IND) {
 185                 if (pptr->type == T_DISCON_IND) {
 186                         /*
 187                          * T_DISCON_IND gets priority following
 188                          * TPI design philosphy.
 189                          *
 190                          * Add it to the events in the "look buffer"
 191                          * list of events. This routine may defer signals.
 192                          */
 193                         if (_t_register_lookevent(tiptr, databuf.buf,
 194                                                 databuf.len, ctlbuf.buf,
 195                                                 ctlbuf.len) < 0) {
 196                                 t_errno = TSYSERR;
 197                                 errno = ENOMEM;
 198                                 goto err_out;
 199                         }
 200                         t_errno = TLOOK;
 201                         goto err_out;
 202                 } else {
 203                         t_errno = TSYSERR;
 204                         errno = EPROTO;
 205                         goto err_out;
 206                 }
 207         }
 208
 209         _T_TX_NEXTSTATE(T_RCVREL, tiptr,
 210                 "t_rcvreldata: invalid state event T_RCVREL");
 211
 212         if (didalloc)
 213                 free(ctlbuf.buf);
 214         else
 215                 tiptr->ti_ctlbuf = ctlbuf.buf;
 216         if (didralloc)
 217                 free(databuf.buf);
 218         else
 219                 tiptr->ti_rcvbuf = databuf.buf;
 220         sig_mutex_unlock(&tiptr->ti_lock);
 221         return (0);
 222
 223 err_out:
 224         sv_errno = errno;
 225
 226         if (didalloc)
 227                 free(ctlbuf.buf);
 228         else
 229                 tiptr->ti_ctlbuf = ctlbuf.buf;
 230         if (didralloc)
 231                 free(databuf.buf);
 232         else
 233                 tiptr->ti_rcvbuf = databuf.buf;
 234         sig_mutex_unlock(&tiptr->ti_lock);
 235         errno = sv_errno;
 236         return (-1);
 237 }