}
}
-int acquire_terminal(const char *name, bool fail, bool force) {
+int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm) {
int fd = -1, notify = -1, r, wd = -1;
assert(name);
return -errno;
/* First, try to get the tty */
- if ((r = ioctl(fd, TIOCSCTTY, force)) < 0 &&
- (force || fail || errno != EPERM)) {
+ r = ioctl(fd, TIOCSCTTY, force);
+
+ /* Sometimes it makes sense to ignore TIOCSCTTY
+ * returning EPERM, i.e. when very likely we already
+ * are have this controlling terminal. */
+ if (r < 0 && errno == EPERM && ignore_tiocstty_eperm)
+ r = 0;
+
+ if (r < 0 && (force || fail || errno != EPERM)) {
r = -errno;
goto fail;
}