dn11.c

操作系统SunOS 4.1.3版本的源码

#ifndef lint
static	char sccsid[] = "@(#)dn11.c 1.1 92/07/30 SMI"; /* from UCB 4.14 6/25/83 */
#endif

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

int dn_abort();
void 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);
		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);
	ioctl(dn, TIOCHPCL, 0);
	signal(SIGALRM, SIG_DFL);
	while ((nw = wait(&lt)) != child && nw != -1)
		;
	fflush(stdout);
	close(dn);
	if (lt != 0) {
		close(FD);
		return (0);
	}
	return (1);
}

void
alarmtr()
{

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

/*
 * Insurance, for some reason we don't seem to be
 *  hanging up...
 */
dn_disconnect()
{

	sleep(2);
	if (FD > 0)
		ioctl(FD, TIOCCDTR, 0);
	close(FD);
}

dn_abort()
{

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