xref: /csrg-svn/usr.bin/tip/aculib/dn11.c (revision 4418)

/*	dn11.c	4.9	81/09/21	*/

#if DN11
/*
 * Routines for dialing up on DN-11
 */
#include "tip.h"
#include <setjmp.h>
#include <errno.h>

int dn_abort();

int alarmtr();

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

dn_dialer(num, acu)
char *num, *acu;
{
	extern errno;
	char *p, *q, phone[40];
	int lt, nw, connected = 1;
	register int timelim;

	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);
#ifdef DEBUG
		printf("child: sleep\n");
#endif
		sleep(2);
#ifdef DEBUG
		printf("child: write\n");
#endif
		nw = write(dn, num, lt = strlen(num));
#ifdef DEBUG
		printf("child: write finished\n");
#endif
		exit(nw != lt);
	}
	/*
	 * open line - will return on carrier
	 */
#ifdef DEBUG
	printf("parent: child %d, open begin\n", child);
#endif
	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);
#ifdef DEBUG
	printf("parent: open finished\n");
#endif
	ioctl(dn, TIOCHPCL, 0);
	signal(SIGALRM, SIG_DFL);
#ifdef DEBUG
	printf("parent: wait for child\n");
#endif
	while ((nw = wait(&lt)) != child && nw != -1)
#ifdef DEBUG
		printf("wait finds child with pid %d\n", nw)
#endif
		;
	fflush(stdout);
	close(dn);
	if (lt != 0) {
		close(FD);
		return(0);
	}
	return(1);
}

alarmtr()
{
	alarm(0);
	longjmp(jmpbuf, 1);
}

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

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