/*      $OpenBSD: dn11.c,v 1.9 2006/03/17 19:17:13 moritz Exp $ */
/*      $NetBSD: dn11.c,v 1.4 1995/10/29 00:49:53 pk Exp $      */

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Routines for dialing up on DN-11
 */
#include "tip.h"

static jmp_buf jmpbuf;
static pid_t child = -1, dn;

static void alarmtr(int);

int
dn_dialer(char *num, char *acu)
{
        int lt, nw;
        int timelim;
        struct termios cntrl;

        if (boolean(value(VERBOSE)))
                printf("\nstarting call...");
        if ((dn = open(acu, 1)) < 0) {
                if (errno == EBUSY)
                        printf("line busy...");
                else
                        printf("acu open error...");
                return (0);
        }
        if (setjmp(jmpbuf)) {
                kill(child, SIGKILL);
                close(dn);
                return (0);
        }
        signal(SIGALRM, alarmtr);
        timelim = 5 * strlen(num);
        alarm(timelim < 30 ? 30 : timelim);
        if ((child = fork()) == 0) {
                /*
                 * ignore this stuff for aborts
                 */
                signal(SIGALRM, SIG_IGN);
                signal(SIGINT, SIG_IGN);
                signal(SIGQUIT, SIG_IGN);
                sleep(2);
                nw = write(dn, num, lt = strlen(num));
                exit(nw != lt);
        }
        /*
         * open line - will return on carrier
         */
        if ((FD = open(DV, 2)) < 0) {
                if (errno == EIO)
                        printf("lost carrier...");
                else
                        printf("dialup line open failed...");
                alarm(0);
                kill(child, SIGKILL);
                close(dn);
                return (0);
        }
        alarm(0);
        tcgetattr(dn, &cntrl);
        cntrl.c_cflag |= HUPCL;
        tcsetattr(dn, TCSANOW, &cntrl);
        signal(SIGALRM, SIG_DFL);
        while ((nw = wait(&lt)) != child && nw != -1)
                ;
        fflush(stdout);
        close(dn);
        if (lt != 0) {
                close(FD);
                return (0);
        }
        return (1);
}

/*ARGSUSED*/
static void
alarmtr(int signo)
{
        alarm(0);
        longjmp(jmpbuf, 1);
}

/*
 * Insurance, for some reason we don't seem to be
 *  hanging up...
 */
void
dn_disconnect(void)
{
        sleep(2);
        if (FD > 0)
                ioctl(FD, TIOCCDTR, 0);
        close(FD);
}

void
dn_abort(void)
{
        sleep(2);
        if (child > 0)
                kill(child, SIGKILL);
        if (dn > 0)
                close(dn);
        if (FD > 0)
                ioctl(FD, TIOCCDTR, 0);
        close(FD);
}