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dn11.c revision 1.9 
      1 /*	$NetBSD: dn11.c,v 1.9 2006/04/03 00:51:14 perry Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)dn11.c	8.1 (Berkeley) 6/6/93";
     36 #endif
     37 __RCSID("$NetBSD: dn11.c,v 1.9 2006/04/03 00:51:14 perry Exp $");
     38 #endif /* not lint */
     39 
     40 /*
     41  * Routines for dialing up on DN-11
     42  */
     43 #include "tip.h"
     44 
     45 static jmp_buf jmpbuf;
     46 static int child = -1, dn;
     47 
     48 static	void	alarmtr(int);
     49 
     50 int
     51 dn_dialer(char *num, char *acu)
     52 {
     53 	int lt, nw;
     54 	int timelim;
     55 	struct termios cntrl;
     56 
     57 	if (boolean(value(VERBOSE)))
     58 		printf("\nstarting call...");
     59 	if ((dn = open(acu, O_WRONLY)) < 0) {
     60 		if (errno == EBUSY)
     61 			printf("line busy...");
     62 		else
     63 			printf("acu open error...");
     64 		return (0);
     65 	}
     66 	if (setjmp(jmpbuf)) {
     67 		kill(child, SIGKILL);
     68 		close(dn);
     69 		return (0);
     70 	}
     71 	signal(SIGALRM, alarmtr);
     72 	timelim = 5 * strlen(num);
     73 	alarm(timelim < 30 ? 30 : timelim);
     74 	if ((child = fork()) == 0) {
     75 		/*
     76 		 * ignore this stuff for aborts
     77 		 */
     78 		signal(SIGALRM, SIG_IGN);
     79 		signal(SIGINT, SIG_IGN);
     80 		signal(SIGQUIT, SIG_IGN);
     81 		sleep(2);
     82 		nw = write(dn, num, lt = strlen(num));
     83 		exit(nw != lt);
     84 	}
     85 	/*
     86 	 * open line - will return on carrier
     87 	 */
     88 	if ((FD = open(DV, O_RDWR)) < 0) {
     89 		if (errno == EIO)
     90 			printf("lost carrier...");
     91 		else
     92 			printf("dialup line open failed...");
     93 		alarm(0);
     94 		kill(child, SIGKILL);
     95 		close(dn);
     96 		return (0);
     97 	}
     98 	alarm(0);
     99 	tcgetattr(dn, &cntrl);
    100 	cntrl.c_cflag |= HUPCL;
    101 	tcsetattr(dn, TCSANOW, &cntrl);
    102 	signal(SIGALRM, SIG_DFL);
    103 	while ((nw = wait(&lt)) != child && nw != -1)
    104 		;
    105 	fflush(stdout);
    106 	close(dn);
    107 	if (lt != 0) {
    108 		close(FD);
    109 		return (0);
    110 	}
    111 	return (1);
    112 }
    113 
    114 static void
    115 alarmtr(int dummy)
    116 {
    117 
    118 	alarm(0);
    119 	longjmp(jmpbuf, 1);
    120 }
    121 
    122 /*
    123  * Insurance, for some reason we don't seem to be
    124  *  hanging up...
    125  */
    126 void
    127 dn_disconnect(void)
    128 {
    129 
    130 	sleep(2);
    131 	if (FD > 0)
    132 		ioctl(FD, TIOCCDTR, 0);
    133 	close(FD);
    134 }
    135 
    136 void
    137 dn_abort(void)
    138 {
    139 
    140 	sleep(2);
    141 	if (child > 0)
    142 		kill(child, SIGKILL);
    143 	if (dn > 0)
    144 		close(dn);
    145 	if (FD > 0)
    146 		ioctl(FD, TIOCCDTR, 0);
    147 	close(FD);
    148 }
    149