+ void *new_handler = NULL;
+
+ sigaction(signum, NULL, &s);
+
+ if (ignore) {
+ if (s.sa_handler == SIG_DFL) /* Ignore only if there isn't any custom handler */
+ new_handler = SIG_IGN;
+ } else {
+ if (s.sa_handler == SIG_IGN) /* Restore only if noone modified our SIG_IGN */
+ new_handler = SIG_DFL;
+ }
+
+ if (new_handler) {
+ s.sa_handler = new_handler;
+ s.sa_flags = 0;
+ sigaction(signum, &s, NULL);
+ }
+}
+
+static void uloop_setup_signals(bool add)
+{
+ static struct sigaction old_sigint, old_sigchld, old_sigterm;
+
+ uloop_install_handler(SIGINT, uloop_handle_sigint, &old_sigint, add);
+ uloop_install_handler(SIGTERM, uloop_handle_sigint, &old_sigterm, add);
+
+ if (uloop_handle_sigchld)
+ uloop_install_handler(SIGCHLD, uloop_signal_wake, &old_sigchld, add);
+
+ uloop_ignore_signal(SIGPIPE, add);
+}
+
+int uloop_signal_add(struct uloop_signal *s)
+{
+ struct list_head *h = &signals;
+ struct uloop_signal *tmp;
+ struct sigaction sa;
+
+ if (s->pending)
+ return -1;
+
+ list_for_each_entry(tmp, &signals, list) {
+ if (tmp->signo > s->signo) {
+ h = &tmp->list;
+ break;
+ }
+ }
+
+ list_add_tail(&s->list, h);
+ s->pending = true;