add directory study
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gohigh
226
study/linux-travel/MINIX-1.5/1.5/Source/commands/modem.c
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226
study/linux-travel/MINIX-1.5/1.5/Source/commands/modem.c
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/* modem - Put modem into DIALIN or DIALOUT mode. Author: F. van Kempen */
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/* Exit: 1 OK, suspended/restarted GETTY
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* 0 Error, GETTY would not listen
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* -1 Error in UTMP file
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* -2 TTY not found
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* -3 Process not GETTY
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* -4 Process busy
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* -5 Unknown process type
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*
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* Version: 1.3 12/30/89
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*
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* Author: F. van Kempen, MicroWalt Corporation
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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sgtty.h>
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#include <signal.h>
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#include <string.h>
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#include <utmp.h>
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static char *Version = "@(#) MODEM 1.3 (12/30/89)";
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int debug = 0; /* generate some debugging output */
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int rings = -999; /* number of rings for dial-in */
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extern char *itoa();
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/* Tell modem to go into DIAL-IN mode.
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* We do this by resetting it and by setting the
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* S0-register to a positive value.
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*/
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int dialin(tty)
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char *tty;
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{
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struct sgttyb old, new;
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char buff[32];
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int fd;
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/* Create file name of modem. */
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strcpy(buff, "/dev/");
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strcat(buff, tty);
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/* open the device */
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fd = open(buff, O_RDWR);
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if (fd < 0) return(0);
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/* Get old terminal status. */
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ioctl(fd, TIOCGETP, &old);
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/* Set temporary parameters. This equals 'stty sane 1200'. */
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ioctl(fd, TIOCGETP, &new);
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new.sg_ispeed = B1200;
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new.sg_ospeed = B1200;
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new.sg_flags = (BITS8 | CRMOD | XTABS);
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ioctl(fd, TIOCSETP, &new);
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/* Say hello to the modem. */
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write(fd, "+++", 3);
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sleep(2);
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/* Reset the modem. */
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write(fd, "AT Z\n", 5);
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sleep(1);
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/* Create the ANSWER string. */
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strcpy(buff, "AT S0=");
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strcat(buff, itoa(rings));
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strcat(buff, "\n");
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write(fd, buff, strlen(buff));
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/* Restore the old terminal parameters. */
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ioctl(fd, TIOCSETP, &old);
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close(fd);
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return(1);
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}
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/* Tell modem to go into DIAL-OUT mode.
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* We do this by resetting it and by setting the
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* S0-register to a zero (zero rings!).
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*/
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int dialout(tty)
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char *tty;
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{
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struct sgttyb old, new;
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char buff[32];
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int fd;
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/* create file name of modem */
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strcpy(buff, "/dev/");
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strcat(buff, tty);
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/* open the device */
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fd = open(buff, O_RDWR);
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if (fd < 0) return(0);
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/* Get old terminal status. */
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ioctl(fd, TIOCGETP, &old);
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/* Set temporary parameters. This equals 'stty sane 1200'. */
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ioctl(fd, TIOCGETP, &new);
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new.sg_ispeed = B1200;
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new.sg_ospeed = B1200;
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new.sg_flags = (BITS8 | CRMOD | XTABS);
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ioctl(fd, TIOCSETP, &new);
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/* Say hello to the modem. */
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write(fd, "+++", 3);
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sleep(2);
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/* Reset the modem. */
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write(fd, "AT Z\n", 5);
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sleep(1);
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/* Send the NO-ANSWER string. */
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write(fd, "AT S0=0\n", 8);
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/* Restore the old terminal parameters. */
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ioctl(fd, TIOCSETP, &old);
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close(fd);
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return(1);
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}
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void usage()
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{
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write(2, "Usage: modem [-d] [-g] <-i rings | -o> line\n", 44);
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exit(-1);
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}
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct utmp entry;
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char *tty, *s;
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int fd, st;
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st = 0;
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while (st < argc) {
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s = argv[++st];
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if (s && *s == '-') switch (*++s) {
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case 'd': /* DEBUG mode */
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debug = 1;
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break;
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case 'g': /* GETTY mode */
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rings = -1;
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break;
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case 'i': /* DIAL-IN mode: suspend GETTY and
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* call modem */
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s++;
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if (*s != '\0')
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rings = atoi(s);
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else
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rings = atoi(argv[++st]);
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break;
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case 'o': /* DIAL-OUT mode: restart GETTY and
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* call modem */
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rings = 0;
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break;
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default:
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usage();
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} else
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break;
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}
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if (rings == -999) usage(); /* badly formed parameters! */
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if (st >= argc) usage(); /* we need the TTY name as well! */
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tty = argv[st]; /* get the terminal name */
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/* Read the UTMP file to find out the PID and STATUS of the GETTY. */
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if ((fd = open(UTMP, O_RDONLY)) < 0) {
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write(2, "modem: cannot open UTMP !\n", 26);
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exit(-1);
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}
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while (read(fd, &entry, sizeof(struct utmp)) == sizeof(struct utmp)) {
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if (!strcmp(entry.ut_line, tty)) {
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close(fd);
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tty = entry.ut_line;
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fd = -1;
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break;
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}
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}
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close(fd);
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/* Process the terminal entry if we got one. */
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if (fd == -1) switch (entry.ut_type) {
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case INIT_PROCESS: /* this is not a tty-process! */
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if (debug)
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write(2, "modem: no TTY-servicing process!\n", 33);
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exit(-3);
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case LOGIN_PROCESS: /* getty waiting for a call */
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break;
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case USER_PROCESS: /* login or user-shell */
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if (debug) write(2, "modem: line is busy.\n", 21);
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exit(-4);
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break;
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default:
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if (debug) write(2, "modem: unknown UTMP entry\n", 26);
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exit(-5);
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} else
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exit(-2);
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/* Now perform the desired action (DIALIN or DIALOUT). */
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switch (rings) {
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case -1: /* -1 means "plain GETTY" */
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kill(entry.ut_pid, SIGBUS); /* send IGNORE signal */
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st = 0;
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break;
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case 0:
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kill(entry.ut_pid, SIGEMT); /* send SUSPEND signal */
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st = dialout(tty); /* put MODEM into DIALOUT */
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break;
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default:
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kill(entry.ut_pid, SIGIOT); /* send RESTART signal */
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st = dialin(tty); /* put MODEM in DIALIN */
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}
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exit(st);
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}
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