/*
 * 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.
 */

/*
 * t_sndudata.c and t_sndvudata.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 <stdlib.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 <syslog.h>
#include "tx.h"

int
_tx_sndudata(int fd, const struct t_unitdata *unitdata, int api_semantics)
{
        struct T_unitdata_req *udreq;
        struct strbuf ctlbuf;
        int size;
        struct _ti_user *tiptr;
        int sv_errno;
        int didalloc;

        if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
                return (-1);
        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_IDLE) {
                        t_errno = TOUTSTATE;
                        sig_mutex_unlock(&tiptr->ti_lock);
                        return (-1);
                }
        }

        if (((int)unitdata->udata.len == 0) &&
            !(tiptr->ti_prov_flag & (SENDZERO|OLD_SENDZERO))) {
                t_errno = TBADDATA;
                sig_mutex_unlock(&tiptr->ti_lock);
                return (-1);
        }

        if ((tiptr->ti_maxpsz > 0) &&
            (unitdata->udata.len > (uint32_t)tiptr->ti_maxpsz)) {
                if (_T_IS_TLI(api_semantics)) {
                        t_errno = TSYSERR;
                        errno = EPROTO;
                } else
                        t_errno = TBADDATA;
                sv_errno = errno;
                sig_mutex_unlock(&tiptr->ti_lock);
                errno = sv_errno;
                return (-1);
        }

        /*
         * 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);
        }

        /* LINTED pointer cast */
        udreq = (struct T_unitdata_req *)ctlbuf.buf;

        udreq->PRIM_type = T_UNITDATA_REQ;
        udreq->DEST_length = unitdata->addr.len;
        udreq->DEST_offset = 0;
        udreq->OPT_length = unitdata->opt.len;
        udreq->OPT_offset = 0;
        size = (int)sizeof (struct T_unitdata_req);

        if (unitdata->addr.len) {
                if (_t_aligned_copy(&ctlbuf, unitdata->addr.len, size,
                    unitdata->addr.buf, &udreq->DEST_offset) < 0) {
                        /*
                         * Aligned copy based will overflow buffer
                         * allocated based on maximum transport address
                         * size information
                         */
                        t_errno = TSYSERR;
                        errno = EPROTO;
                        goto err_out;
                }
                size = udreq->DEST_offset + udreq->DEST_length;
        }
        if (unitdata->opt.len) {
                if (_t_aligned_copy(&ctlbuf, unitdata->opt.len, size,
                    unitdata->opt.buf, &udreq->OPT_offset) < 0) {
                        /*
                         * Aligned copy based will overflow buffer
                         * allocated based on maximum transport option
                         * size information
                         */
                        t_errno = TSYSERR;
                        errno = EPROTO;
                        goto err_out;
                }
                size = udreq->OPT_offset + udreq->OPT_length;
        }

        if (size > (int)ctlbuf.maxlen) {
                t_errno = TSYSERR;
                errno = EIO;
                goto err_out;
        }

        ctlbuf.len = size;

        /*
         * 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.
         * At this point, we are sure SENDZERO is supported and the
         * putmsg below may send a zero length message,
         * (i.e with valid control part, but zero data part)
         */
        sig_mutex_unlock(&tiptr->ti_lock);
        if (putmsg(fd, &ctlbuf, (struct strbuf *)&unitdata->udata, 0) < 0) {
                if (errno == EAGAIN)
                        t_errno = TFLOW;
                else
                        t_errno = TSYSERR;
                sv_errno = errno;
                sig_mutex_lock(&tiptr->ti_lock);
                errno = sv_errno;
                goto err_out;
        }
        sig_mutex_lock(&tiptr->ti_lock);

        _T_TX_NEXTSTATE(T_SNDUDATA, tiptr,
                        "t_sndudata: invalid state event T_SNDUDATA");
        if (didalloc)
                free(ctlbuf.buf);
        else
                tiptr->ti_ctlbuf = ctlbuf.buf;
        sig_mutex_unlock(&tiptr->ti_lock);
        return (0);
err_out:
        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);
}