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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.10 */
#include "mt.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <stropts.h>
#include <sys/stream.h>
#define _SUN_TPI_VERSION 2
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <xti.h>
#include <signal.h>
#include <syslog.h>
#include "tx.h"
int
_tx_rcvdis(int fd, struct t_discon *discon, int api_semantics)
{
struct strbuf ctlbuf;
struct strbuf databuf;
int retval;
union T_primitives *pptr;
struct _ti_user *tiptr;
int sv_errno;
int flg = 0;
int didalloc, didralloc;
int use_lookbufs = 0;
if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
return (-1);
/*
* Acquire per thread lock.
* Note: Lock is held across most of this routine
* including the blocking getmsg() call. This is fine
* because it is first verfied that an event is pending
*/
sig_mutex_lock(&tiptr->ti_lock);
if (tiptr->ti_servtype == T_CLTS) {
t_errno = TNOTSUPPORT;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
if (_T_IS_XTI(api_semantics)) {
/*
* User level state verification only done for XTI
* because doing for TLI may break existing applications
*/
if (!(tiptr->ti_state == T_DATAXFER ||
tiptr->ti_state == T_OUTCON ||
tiptr->ti_state == T_OUTREL ||
tiptr->ti_state == T_INREL ||
(tiptr->ti_state == T_INCON && tiptr->ti_ocnt > 0))) {
t_errno = TOUTSTATE;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
}
/*
* Handle likely scenario as special case:
* Is there a discon in look buffer as the first
* event in the lookbuffer, is so just get it.
*/
if ((tiptr->ti_lookcnt > 0) &&
/* LINTED pointer cast */
(*((t_scalar_t *)tiptr->ti_lookbufs.tl_lookcbuf) == T_DISCON_IND)) {
/*
* The T_DISCON_IND is already in the look buffer
*/
ctlbuf.len = tiptr->ti_lookbufs.tl_lookclen;
ctlbuf.buf = tiptr->ti_lookbufs.tl_lookcbuf;
/* Note: ctlbuf.maxlen not used in this case */
databuf.len = tiptr->ti_lookbufs.tl_lookdlen;
databuf.buf = tiptr->ti_lookbufs.tl_lookdbuf;
/* Note databuf.maxlen not used in this case */
use_lookbufs = 1;
} else {
if ((retval = _t_look_locked(fd, tiptr, 0,
api_semantics)) < 0) {
sv_errno = errno;
sig_mutex_unlock(&tiptr->ti_lock);
errno = sv_errno;
return (-1);
}
if (retval != T_DISCONNECT) {
t_errno = TNODIS;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
/*
* get disconnect off read queue.
* use ctl and rcv buffers
*
* Acquire ctlbuf for use in sending/receiving control part
* of the message.
*/
if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
sv_errno = errno;
sig_mutex_unlock(&tiptr->ti_lock);
errno = sv_errno;
return (-1);
}
/*
* Acquire databuf for use in sending/receiving data part
*/
if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0) {
sv_errno = errno;
if (didalloc)
free(ctlbuf.buf);
else
tiptr->ti_ctlbuf = ctlbuf.buf;
sig_mutex_unlock(&tiptr->ti_lock);
errno = sv_errno;
return (-1);
}
/*
* Since we already verified that a disconnect event
* is present, we assume that this getmsg() cannot
* block indefinitely
*/
do {
retval = getmsg(fd, &ctlbuf, &databuf, &flg);
} while (retval < 0 && errno == EINTR);
if (retval < 0) {
t_errno = TSYSERR;
goto err_out;
}
if (databuf.len == -1) databuf.len = 0;
/*
* did I get entire message?
*/
if (retval > 0) {
t_errno = TSYSERR;
errno = EIO;
goto err_out;
}
}
/* LINTED pointer cast */
pptr = (union T_primitives *)ctlbuf.buf;
if ((ctlbuf.len < (int)sizeof (struct T_discon_ind)) ||
(pptr->type != T_DISCON_IND)) {
t_errno = TSYSERR;
errno = EPROTO;
goto err_out;
}
/*
* clear more and expedited flags
*/
tiptr->ti_flags &= ~(MORE | EXPEDITED);
if (tiptr->ti_ocnt <= 0) {
_T_TX_NEXTSTATE(T_RCVDIS1, tiptr,
"t_rcvdis: invalid state event T_RCVDIS1");
} else {
if (tiptr->ti_ocnt == 1) {
_T_TX_NEXTSTATE(T_RCVDIS2, tiptr,
"t_rcvdis: invalid state event T_RCVDIS2");
} else {
_T_TX_NEXTSTATE(T_RCVDIS3, tiptr,
"t_rcvdis: invalid state event T_RCVDIS3");
}
tiptr->ti_ocnt--;
tiptr->ti_flags &= ~TX_TQFULL_NOTIFIED;
}
if (discon != NULL) {
if (_T_IS_TLI(api_semantics) || discon->udata.maxlen > 0) {
if (databuf.len > (int)discon->udata.maxlen) {
t_errno = TBUFOVFLW;
goto err_out;
}
(void) memcpy(discon->udata.buf, databuf.buf,
(size_t)databuf.len);
discon->udata.len = databuf.len;
}
discon->reason = pptr->discon_ind.DISCON_reason;
discon->sequence = pptr->discon_ind.SEQ_number;
}
if (use_lookbufs)
_t_free_looklist_head(tiptr);
else {
if (didalloc)
free(ctlbuf.buf);
else
tiptr->ti_ctlbuf = ctlbuf.buf;
if (didralloc)
free(databuf.buf);
else
tiptr->ti_rcvbuf = databuf.buf;
}
sig_mutex_unlock(&tiptr->ti_lock);
return (0);
err_out:
sv_errno = errno;
if (use_lookbufs)
_t_free_looklist_head(tiptr);
else {
if (didalloc)
free(ctlbuf.buf);
else
tiptr->ti_ctlbuf = ctlbuf.buf;
if (didralloc)
free(databuf.buf);
else
tiptr->ti_rcvbuf = databuf.buf;
}
sig_mutex_unlock(&tiptr->ti_lock);
errno = sv_errno;
return (-1);
}
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