usr/src/lib/libc/port/nsl/t_sndrel.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 1.4 */
  32
  33 /*
  34  * t_sndrel.c and t_sndreldata.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 <errno.h>
  40 #include <stropts.h>
  41 #include <sys/stream.h>
  42 #define _SUN_TPI_VERSION 2
  43 #include <sys/tihdr.h>
  44 #include <sys/timod.h>
  45 #include <xti.h>
  46 #include "tx.h"
  47
  48 int
  49 _tx_sndrel(int fd, int api_semantics)
  50 {
  51         struct T_ordrel_req orreq;
  52         struct strbuf ctlbuf;
  53         struct _ti_user *tiptr;
  54
  55         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
  56                 return (-1);
  57         sig_mutex_lock(&tiptr->ti_lock);
  58
  59         if (tiptr->ti_servtype != T_COTS_ORD) {
  60                 t_errno = TNOTSUPPORT;
  61                 sig_mutex_unlock(&tiptr->ti_lock);
  62                 return (-1);
  63         }
  64
  65         if (_T_IS_XTI(api_semantics)) {
  66                 /*
  67                  * User level state verification only done for XTI
  68                  * because doing for TLI may break existing applications
  69                  */
  70                 if (!(tiptr->ti_state == T_DATAXFER ||
  71                     tiptr->ti_state == T_INREL)) {
  72                         t_errno = TOUTSTATE;
  73                         sig_mutex_unlock(&tiptr->ti_lock);
  74                         return (-1);
  75                 }
  76
  77                 if (_t_look_locked(fd, tiptr, 0,
  78                     api_semantics) == T_DISCONNECT) {
  79                         t_errno = TLOOK;
  80                         sig_mutex_unlock(&tiptr->ti_lock);
  81                         return (-1);
  82                 }
  83
  84         }
  85
  86         orreq.PRIM_type = T_ORDREL_REQ;
  87         ctlbuf.maxlen = (int)sizeof (struct T_ordrel_req);
  88         ctlbuf.len = (int)sizeof (struct T_ordrel_req);
  89         ctlbuf.buf = (caddr_t)&orreq;
  90
  91         /*
  92          * Calls to send data (write or putmsg) can potentially
  93          * block, for MT case, we drop the lock and enable signals here
  94          * and acquire it back
  95          */
  96         sig_mutex_unlock(&tiptr->ti_lock);
  97         if (putmsg(fd, &ctlbuf, NULL, 0) < 0) {
  98                 if (errno == EAGAIN)
  99                         t_errno = TFLOW;
 100                 else
 101                         t_errno = TSYSERR;
 102                 return (-1);
 103         }
 104         sig_mutex_lock(&tiptr->ti_lock);
 105         _T_TX_NEXTSTATE(T_SNDREL, tiptr,
 106                                 "t_sndrel: invalid state on event T_SNDREL");
 107         sig_mutex_unlock(&tiptr->ti_lock);
 108         return (0);
 109 }