- memset(&s, 0, sizeof(struct sigaction));
- s.sa_handler = uloop_handle_sigint;
- s.sa_flags = 0;
- sigaction(SIGINT, &s, NULL);
+ struct sigaction *act;
+
+ act = NULL;
+ sigaction(signum, NULL, &s);
+
+ if (add) {
+ if (s.sa_handler == SIG_DFL) { /* Do not override existing custom signal handlers */
+ memcpy(old, &s, sizeof(struct sigaction));
+ s.sa_handler = handler;
+ s.sa_flags = 0;
+ act = &s;
+ }
+ }
+ else if (s.sa_handler == handler) { /* Do not restore if someone modified our handler */
+ act = old;
+ }
+
+ if (act != NULL)
+ sigaction(signum, act, NULL);
+}
+
+static void uloop_ignore_signal(int signum, bool ignore)
+{
+ struct sigaction s;
+ 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);
+ uloop_install_handler(SIGCHLD, uloop_sigchld, &old_sigchld, add);
+
+ uloop_ignore_signal(SIGPIPE, add);