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[unix-history] / usr / src / usr.bin / tip / aculib / v831.c

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
static char sccsid[] = "@(#)v831.c      5.1 (Berkeley) %G%";
#endif not lint

/*
* Routines for dialing up on Vadic 831
*/
#include <sys/time.h>

#include "tip.h"

int     v831_abort();
static  int alarmtr();
extern  errno;

static jmp_buf jmpbuf;
static int child = -1;

v831_dialer(num, acu)
       char *num, *acu;
{
       int status, pid, connected = 1;
       register int timelim;

       if (boolean(value(VERBOSE)))
               printf("\nstarting call...");
#ifdef DEBUG
       printf ("(acu=%s)\n", acu);
#endif
       if ((AC = open(acu, O_RDWR)) < 0) {
               if (errno == EBUSY)
                       printf("line busy...");
               else
                       printf("acu open error...");
               return (0);
       }
       if (setjmp(jmpbuf)) {
               kill(child, SIGKILL);
               close(AC);
               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);
               exit(dialit(num, acu) != 'A');
       }
       /*
        * open line - will return on carrier
        */
       if ((FD = open(DV, O_RDWR)) < 0) {
#ifdef DEBUG
               printf("(after open, errno=%d)\n", errno);
#endif
               if (errno == EIO)
                       printf("lost carrier...");
               else
                       printf("dialup line open failed...");
               alarm(0);
               kill(child, SIGKILL);
               close(AC);
               return (0);
       }
       alarm(0);
#ifdef notdef
       ioctl(AC, TIOCHPCL, 0);
#endif
       signal(SIGALRM, SIG_DFL);
       while ((pid = wait(&status)) != child && pid != -1)
               ;
       if (status) {
               close(AC);
               return (0);
       }
       return (1);
}

static
alarmtr()
{

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

/*
* Insurance, for some reason we don't seem to be
*  hanging up...
*/
v831_disconnect()
{
       struct sgttyb cntrl;

       sleep(2);
#ifdef DEBUG
       printf("[disconnect: FD=%d]\n", FD);
#endif
       if (FD > 0) {
               ioctl(FD, TIOCCDTR, 0);
               ioctl(FD, TIOCGETP, &cntrl);
               cntrl.sg_ispeed = cntrl.sg_ospeed = 0;
               ioctl(FD, TIOCSETP, &cntrl);
               ioctl(FD, TIOCNXCL, (struct sgttyb *)NULL);
       }
       close(FD);
}

v831_abort()
{

#ifdef DEBUG
       printf("[abort: AC=%d]\n", AC);
#endif
       sleep(2);
       if (child > 0)
               kill(child, SIGKILL);
       if (AC > 0)
               ioctl(FD, TIOCNXCL, (struct sgttyb *)NULL);
               close(AC);
       if (FD > 0)
               ioctl(FD, TIOCCDTR, 0);
       close(FD);
}

/*
* Sigh, this probably must be changed at each site.
*/
struct vaconfig {
       char    *vc_name;
       char    vc_rack;
       char    vc_modem;
} vaconfig[] = {
       { "/dev/cua0",'4','0' },
       { "/dev/cua1",'4','1' },
       { 0 }
};

#define pc(x)   (c = x, write(AC,&c,1))
#define ABORT   01
#define SI      017
#define STX     02
#define ETX     03

static
dialit(phonenum, acu)
       register char *phonenum;
       char *acu;
{
       register struct vaconfig *vp;
       struct sgttyb cntrl;
       char c, *sanitize();
       int i, two = 2;

       phonenum = sanitize(phonenum);
#ifdef DEBUG
       printf ("(dial phonenum=%s)\n", phonenum);
#endif
       if (*phonenum == '<' && phonenum[1] == 0)
               return ('Z');
       for (vp = vaconfig; vp->vc_name; vp++)
               if (strcmp(vp->vc_name, acu) == 0)
                       break;
       if (vp->vc_name == 0) {
               printf("Unable to locate dialer (%s)\n", acu);
               return ('K');
       }
       ioctl(AC, TIOCGETP, &cntrl);
       cntrl.sg_ispeed = cntrl.sg_ospeed = B2400;
       cntrl.sg_flags = RAW | EVENP | ODDP;
       ioctl(AC, TIOCSETP, &cntrl);
       ioctl(AC, TIOCFLUSH, &two);
       pc(STX);
       pc(vp->vc_rack);
       pc(vp->vc_modem);
       while (*phonenum && *phonenum != '<')
               pc(*phonenum++);
       pc(SI);
       pc(ETX);
       sleep(1);
       i = read(AC, &c, 1);
#ifdef DEBUG
       printf("read %d chars, char=%c, errno %d\n", i, c, errno);
#endif
       if (i != 1)
               c = 'M';
       if (c == 'B' || c == 'G') {
               char cc, oc = c;

               pc(ABORT);
               read(AC, &cc, 1);
#ifdef DEBUG
               printf("abort response=%c\n", cc);
#endif
               c = oc;
               v831_disconnect();
       }
       close(AC);
#ifdef DEBUG
       printf("dialit: returns %c\n", c);
#endif
       return (c);
}

static char *
sanitize(s)
       register char *s;
{
       static char buf[128];
       register char *cp;

       for (cp = buf; *s; s++) {
               if (!isdigit(*s) && *s == '<' && *s != '_')
                       continue;
               if (*s == '_')
                       *s = '=';
               *cp++ = *s;
       }
       *cp++ = 0;
       return (buf);
}