usr/src/lib/libc/port/nsl/t_sndreldata.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_sndrel.c and t_sndreldata.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 <errno.h>
  37 #include <stropts.h>
  38 #include <sys/stream.h>
  39 #define _SUN_TPI_VERSION 2
  40 #include <sys/tihdr.h>
  41 #include <sys/timod.h>
  42 #include <xti.h>
  43 #include <assert.h>
  44 #include "tx.h"
  45
  46 int
  47 _tx_sndreldata(int fd, struct t_discon *discon, int api_semantics)
  48 {
  49         struct T_ordrel_req orreq;
  50         struct strbuf ctlbuf;
  51         struct _ti_user *tiptr;
  52
  53         assert(api_semantics == TX_XTI_XNS5_API);
  54         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
  55                 return (-1);
  56         sig_mutex_lock(&tiptr->ti_lock);
  57
  58         if (tiptr->ti_servtype != T_COTS_ORD) {
  59                 t_errno = TNOTSUPPORT;
  60                 sig_mutex_unlock(&tiptr->ti_lock);
  61                 return (-1);
  62         }
  63
  64         if (!(tiptr->ti_state == T_DATAXFER ||
  65             tiptr->ti_state == T_INREL)) {
  66                 t_errno = TOUTSTATE;
  67                 sig_mutex_unlock(&tiptr->ti_lock);
  68                 return (-1);
  69         }
  70
  71         if (_t_look_locked(fd, tiptr, 0,
  72             api_semantics) == T_DISCONNECT) {
  73                 t_errno = TLOOK;
  74                 sig_mutex_unlock(&tiptr->ti_lock);
  75                 return (-1);
  76         }
  77
  78         /*
  79          * Someday there could be transport providers that support T_ORDRELDATA
  80          * Until that happens, this function returns TBADDATA if user data
  81          * was specified. If no user data is specified, this function
  82          * behaves as t_sndrel()
  83          * Note: Currently only mOSI ("minimal OSI") provider is specified
  84          * to use T_ORDRELDATA so probability of needing it is minimal.
  85          */
  86
  87         if (discon && discon->udata.len) {
  88                 t_errno = TBADDATA;
  89                 sig_mutex_unlock(&tiptr->ti_lock);
  90                 return (-1);
  91         }
  92
  93         orreq.PRIM_type = T_ORDREL_REQ;
  94         ctlbuf.maxlen = (int)sizeof (struct T_ordrel_req);
  95         ctlbuf.len = (int)sizeof (struct T_ordrel_req);
  96         ctlbuf.buf = (caddr_t)&orreq;
  97
  98         /*
  99          * Calls to send data (write or putmsg) can potentially
 100          * block, for MT case, we drop the lock and enable signals here
 101          * and acquire it back
 102          */
 103         sig_mutex_unlock(&tiptr->ti_lock);
 104         if (putmsg(fd, &ctlbuf, NULL, 0) < 0) {
 105                 if (errno == EAGAIN)
 106                         t_errno = TFLOW;
 107                 else
 108                         t_errno = TSYSERR;
 109                 return (-1);
 110         }
 111         sig_mutex_lock(&tiptr->ti_lock);
 112         _T_TX_NEXTSTATE(T_SNDREL, tiptr,
 113                         "t_sndreldata: invalid state on event T_SNDREL");
 114         sig_mutex_unlock(&tiptr->ti_lock);
 115         return (0);
 116 }