/*
 * 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#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);
}