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