libnsl/nsl/t_sndvudata.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_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 <assert.h>
#include "tx.h"

int
_tx_sndvudata(int fd, const struct t_unitdata *unitdata, struct t_iovec *tiov,
    unsigned int tiovcount, int api_semantics)
{
    struct T_unitdata_req *udreq;
    struct strbuf ctlbuf;
    struct strbuf databuf;
    int size;
    struct _ti_user *tiptr;
    int sv_errno;
    int didalloc;
    char *dataptr;
    unsigned int nbytes;

    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_CLTS) {
        t_errno = TNOTSUPPORT;
        sig_mutex_unlock(&tiptr->ti_lock);
        return (-1);
    }

    if (tiovcount == 0 || tiovcount > T_IOV_MAX) {
        t_errno = TBADDATA;
        sig_mutex_unlock(&tiptr->ti_lock);
        return (-1);
    }

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

    nbytes = _t_bytecount_upto_intmax(tiov, tiovcount);

    if ((nbytes == 0) &&
        !(tiptr->ti_prov_flag & (SENDZERO|OLD_SENDZERO))) {
        t_errno = TBADDATA;
        sig_mutex_unlock(&tiptr->ti_lock);
        return (-1);
    }

    if ((tiptr->ti_maxpsz > 0) && (nbytes > (uint32_t)tiptr->ti_maxpsz)) {
        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;

    dataptr = NULL;
    if (nbytes != 0) {
        if ((dataptr = malloc((size_t)nbytes)) == NULL) {
            t_errno = TSYSERR;
            goto err_out;
        }
        _t_gather(dataptr, tiov, tiovcount);
    }
    databuf.buf = dataptr;
    databuf.len = nbytes;
    databuf.maxlen = nbytes;
    /*
     * 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, &databuf, 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_sndvudata: invalid state event T_SNDUDATA");
    if (didalloc)
        free(ctlbuf.buf);
    else
        tiptr->ti_ctlbuf = ctlbuf.buf;
    if (dataptr != NULL)
        free(dataptr);
    sig_mutex_unlock(&tiptr->ti_lock);
    return (0);
err_out:
    sv_errno = errno;
    if (didalloc)
        free(ctlbuf.buf);
    else
        tiptr->ti_ctlbuf = ctlbuf.buf;
    if (dataptr != NULL)
        free(dataptr);
    sig_mutex_unlock(&tiptr->ti_lock);
    errno = sv_errno;
    return (-1);
}