libnsl/nsl/t_unbind.c

	t_unbind.c revision 61961e0f20c7637a3846bb39786bb9dffa91dfb9
/*
 * 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 1.3.4.1 */

#include "mt.h"
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/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_unbind(int fd, int api_semantics)
{
    struct _ti_user *tiptr;
    sigset_t mask;
    int sv_errno, retval, didalloc;
    struct strbuf ctlbuf;

    if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
        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;
            return (-1);
        }
    }

    /*
     * Since unbind is not an idempotent operation, we
     * block signals around the call.
     * Note that sig_mutex_lock() only defers signals, it does not
     * block them, so interruptible syscalls could still get EINTR.
     */
    (void) thr_sigsetmask(SIG_SETMASK, &fillset, &mask);
    sig_mutex_lock(&tiptr->ti_lock);
    /*
     * Acquire buffer for use in sending/receiving the message.
     * Note: assumes (correctly) that ti_ctlsize is large enough
     * to hold sizeof (struct T_unbind_req/ack)
     */
    if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
        sv_errno = errno;
        sig_mutex_unlock(&tiptr->ti_lock);
        (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
        errno = sv_errno;
        return (-1);
    }

    retval = _tx_unbind_locked(fd, tiptr, &ctlbuf);

    sv_errno = errno;
    if (didalloc)
        free(ctlbuf.buf);
    else
        tiptr->ti_ctlbuf = ctlbuf.buf;
    sig_mutex_unlock(&tiptr->ti_lock);
    (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
    errno = sv_errno;
    return (retval);
}

int
_tx_unbind_locked(int fd, struct _ti_user *tiptr, struct strbuf *ctlbufp)
{
    struct T_unbind_req *unbind_reqp;
    int retlen;

    if (_t_is_event(fd, tiptr) < 0)
        return (-1);

    /* LINTED pointer cast */
    unbind_reqp = (struct T_unbind_req *)ctlbufp->buf;
    unbind_reqp->PRIM_type = T_UNBIND_REQ;

    if (_t_do_ioctl(fd, (char *)unbind_reqp,
        (int)sizeof (struct T_unbind_req), TI_UNBIND, &retlen) < 0) {
        goto err_out;
    }

    if (_ioctl(fd, I_FLUSH, FLUSHRW) < 0) {
        t_errno = TSYSERR;
        goto err_out;
    }

    /*
     * clear more and expedited data bits
     */
    tiptr->ti_flags &= ~(MORE|EXPEDITED);

    _T_TX_NEXTSTATE(T_UNBIND, tiptr,
            "t_unbind: invalid state event T_UNBIND");

    return (0);

err_out:
    return (-1);
}