libnsl/nsl/t_sndreldata.c

/*
 * 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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * t_sndrel.c and t_sndreldata.c are very similar and contain common code.
 * Any changes to either of them should be reviewed to see whether they
 * are applicable to the other file.
 */
#include "mt.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 <assert.h>
#include "tx.h"

int
_tx_sndreldata(int fd, struct t_discon *discon, int api_semantics)
{
    struct T_ordrel_req orreq;
    struct strbuf ctlbuf;
    struct _ti_user *tiptr;

    assert(api_semantics == TX_XTI_XNS5_API);
    if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
        return (-1);
    sig_mutex_lock(&tiptr->ti_lock);

    if (tiptr->ti_servtype != T_COTS_ORD) {
        t_errno = TNOTSUPPORT;
        sig_mutex_unlock(&tiptr->ti_lock);
        return (-1);
    }

    if (!(tiptr->ti_state == T_DATAXFER ||
        tiptr->ti_state == T_INREL)) {
        t_errno = TOUTSTATE;
        sig_mutex_unlock(&tiptr->ti_lock);
        return (-1);
    }

    if (_t_look_locked(fd, tiptr, 0,
        api_semantics) == T_DISCONNECT) {
        t_errno = TLOOK;
        sig_mutex_unlock(&tiptr->ti_lock);
        return (-1);
    }

    /*
     * Someday there could be transport providers that support T_ORDRELDATA
     * Until that happens, this function returns TBADDATA if user data
     * was specified. If no user data is specified, this function
     * behaves as t_sndrel()
     * Note: Currently only mOSI ("minimal OSI") provider is specified
     * to use T_ORDRELDATA so probability of needing it is minimal.
     */

    if (discon && discon->udata.len) {
        t_errno = TBADDATA;
        sig_mutex_unlock(&tiptr->ti_lock);
        return (-1);
    }

    orreq.PRIM_type = T_ORDREL_REQ;
    ctlbuf.maxlen = (int)sizeof (struct T_ordrel_req);
    ctlbuf.len = (int)sizeof (struct T_ordrel_req);
    ctlbuf.buf = (caddr_t)&orreq;

    /*
     * Calls to send data (write or putmsg) can potentially
     * block, for MT case, we drop the lock and enable signals here
     * and acquire it back
     */
    sig_mutex_unlock(&tiptr->ti_lock);
    if (putmsg(fd, &ctlbuf, NULL, 0) < 0) {
        if (errno == EAGAIN)
            t_errno = TFLOW;
        else
            t_errno = TSYSERR;
        return (-1);
    }
    sig_mutex_lock(&tiptr->ti_lock);
    _T_TX_NEXTSTATE(T_SNDREL, tiptr,
            "t_sndreldata: invalid state on event T_SNDREL");
    sig_mutex_unlock(&tiptr->ti_lock);
    return (0);
}