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