84 lines
1.5 KiB
C
84 lines
1.5 KiB
C
/* $Id$ */
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#ifdef __USG
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/* system V, so no /etc/ttys file. In this case, scan the
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/etc/utmp file
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*/
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struct utmp {
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char ut_name[8];
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char ut_id[4];
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char ut_line[12];
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short ut_pid;
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short ut_type;
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struct exit_status {
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short e_termination;
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short e_exit;
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} ut_exit;
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long ut_time;
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};
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#define FILENAME "/etc/utmp"
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#else
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#define FILENAME "/etc/ttys"
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#endif
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char *ttyname();
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char *rindex();
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ttyslot()
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{
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register char *tp, *p;
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int fd;
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int retval = 1;
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#ifdef __USG
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struct utmp buf;
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#else
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char buf[32];
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#endif
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if (! (tp=ttyname(0)) && ! (tp=ttyname(1)) && !(tp=ttyname(2)))
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return 0;
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if (! (p = rindex(tp, '/')))
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p = tp;
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else
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p++;
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if ((fd = open(FILENAME, 0)) < 0) return 0;
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#ifdef __USG
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while (read(fd, (char *) &buf, sizeof(buf)) == sizeof(buf)) {
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/* processes associated with a terminal ...
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unfortunately we cannot use the include file because
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some systems have a different one ...
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INIT_PROCESS, DEAD_PROCESS, USER_PROCESS, LOGIN_PROCESS
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*/
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if ((buf.ut_type >= 5 && buf.ut_type <= 8) &&
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! strncmp(buf.ut_line, p, sizeof(buf.ut_line))) {
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close(fd);
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return retval;
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}
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retval++;
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}
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close(fd);
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return 0;
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#else
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for (;;) {
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tp = buf;
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for (;;tp++) {
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if (read(fd, tp, 1) != 1) {
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close(fd);
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return 0;
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}
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if (*tp == '\n' || tp >= &buf[31]) {
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*tp = 0;
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if (tp < buf+2) buf[2] = '\0';
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tp = buf+2;
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break;
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}
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}
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if (! strcmp(p, tp)) {
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close(fd);
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return retval;
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}
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retval++;
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}
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/*NOTREACHED*/
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#endif
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}
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