/* Lock or unlock a terminal line. */
static int
tty_lock(char *path, int mode)
{
static char saved_path[PATH_MAX];
static int saved_lock = 0;
struct passwd *pw;
int fd;
char apid[16];
/* We do not lock standard input. */
if ((opt_l == 0) || ((path == NULL) && (saved_lock == 0))) return(0);
if (mode == 1) { /* lock */
sprintf(saved_path, "%s/LCK..%s", _PATH_LOCKD, path);
if (tty_already_locked(saved_path)) {
fprintf(stderr, _("slattach: /dev/%s already locked!\n"), path);
return(-1);
}
if ((fd = creat(saved_path, 0644)) < 0) {
if (errno != EEXIST)
if (opt_q == 0) fprintf(stderr,
_("slattach: tty_lock: (%s): %s\n"),
saved_path, strerror(errno));
return(-1);
}
sprintf(apid, "%10d\n", getpid());
if (write(fd, apid, strlen(apid)) != strlen(apid)) {
fprintf(stderr, _("slattach: cannot write PID file\n"));
close(fd);
unlink(saved_path);
return(-1);
}
/* Make sure UUCP owns the lockfile. Required by some packages. */
if ((pw = getpwnam(_UID_UUCP)) == NULL) {
if (opt_q == 0) fprintf(stderr, _("slattach: tty_lock: UUCP user %s unknown!\n"),
_UID_UUCP);
(void) close(fd);
return(0); /* keep the lock anyway */
}
if (fchown(fd, pw->pw_uid, pw->pw_gid))
/* keep the lock anyway */;
(void) close(fd);
saved_lock = 1;
} else { /* unlock */
if (saved_lock != 1) return(0);
if (unlink(saved_path) < 0) {
if (opt_q == 0) fprintf(stderr,
"slattach: tty_unlock: (%s): %s\n", saved_path,
strerror(errno));
return(-1);
}
saved_lock = 0;
}
return(0);
}
/* Lock or unlock a terminal line. */
static int tty_lock(char *path, int mode)
{
int fd;
int ret;
char apid[16];
struct passwd *pw;
static int saved_lock = 0;
static char saved_path[PATH_MAX];
/* We do not lock standard input. */
if (mode == 1) { /* lock */
sprintf(saved_path, "%s/LCK..%s", _PATH_LOCKD, path);
if (tty_already_locked(saved_path)) {
fprintf(stderr, "/dev/%s already locked\n", path);
return -1;
}
if ((fd = creat(saved_path, 0644)) < 0) {
if (errno != EEXIST) {
fprintf(stderr, "tty_lock: (%s): %s\n",
saved_path, strerror(errno));
}
return -1;
}
sprintf(apid, "%10d\n", getpid());
if ((ret = write(fd, apid, strlen(apid))) != strlen(apid)) {
fprintf(stderr, "write to PID file incomplete, ret = %d\n", ret);
close(fd);
unlink(saved_path);
return -1;
}
(void) close(fd);
/* Make sure UUCP owns the lockfile. Required by some packages. */
if ((pw = getpwnam(_UID_UUCP)) == NULL) {
fprintf(stderr, "tty_lock: UUCP user %s unknown\n", _UID_UUCP);
return 0;
}
(void) chown(saved_path, pw->pw_uid, pw->pw_gid);
saved_lock = 1;
} else { /* unlock */
if (saved_lock != 1)
return 0;
if (unlink(saved_path) < 0) {
fprintf(stderr, "tty_unlock: (%s): %s\n",
saved_path, strerror(errno));
return -1;
}
saved_lock = 0;
}
return 0;
}
