Replace signal() with sigaction()

The man page for signal(3) reads:

> new applications should use sigaction() rather than signal()

3 files changed, 12 insertions, 8 deletions

diff --git a/sway/main.c b/sway/main.c
index 56f09b7e..69efd6cb 100644
--- a/sway/main.c
+++ b/sway/main.c
@@ -161,19 +161,21 @@ static void restore_signals(void) {
 	sigset_t set;
 	sigemptyset(&set);
 	sigprocmask(SIG_SETMASK, &set, NULL);
-	signal(SIGCHLD, SIG_DFL);
-	signal(SIGPIPE, SIG_DFL);
+
+	struct sigaction sa_dfl = { .sa_handler = SIG_DFL };
+	sigaction(SIGCHLD, &sa_dfl, NULL);
+	sigaction(SIGPIPE, &sa_dfl, NULL);
 }
 
 static void init_signals(void) {
 	wl_event_loop_add_signal(server.wl_event_loop, SIGTERM, term_signal, NULL);
 	wl_event_loop_add_signal(server.wl_event_loop, SIGINT, term_signal, NULL);
 
+	struct sigaction sa_ign = { .sa_handler = SIG_IGN };
 	// avoid need to reap children
-	signal(SIGCHLD, SIG_IGN);
-
+	sigaction(SIGCHLD, &sa_ign, NULL);
 	// prevent ipc write errors from crashing sway
-	signal(SIGPIPE, SIG_IGN);
+	sigaction(SIGPIPE, &sa_ign, NULL);
 
 	pthread_atfork(NULL, NULL, restore_signals);
 }
diff --git a/swaybar/main.c b/swaybar/main.c
index 3dc67233..e1b0ceca 100644
--- a/swaybar/main.c
+++ b/swaybar/main.c
@@ -93,8 +93,9 @@ int main(int argc, char **argv) {
 
 	free(socket_path);
 
-	signal(SIGINT, sig_handler);
-	signal(SIGTERM, sig_handler);
+	struct sigaction sa = { .sa_handler = sig_handler };
+	sigaction(SIGINT, &sa, NULL);
+	sigaction(SIGTERM, &sa, NULL);
 
 	swaybar.running = true;
 	bar_run(&swaybar);
diff --git a/swaynag/main.c b/swaynag/main.c
index 54317dce..b68157ff 100644
--- a/swaynag/main.c
+++ b/swaynag/main.c
@@ -102,7 +102,8 @@ int main(int argc, char **argv) {
 		sway_log(SWAY_DEBUG, "\t[%s] `%s`", button->text, button->action);
 	}
 
-	signal(SIGTERM, sig_handler);
+	struct sigaction sa = { .sa_handler = sig_handler };
+	sigaction(SIGTERM, &sa, NULL);
 
 	swaynag_setup(&swaynag);
 	swaynag_run(&swaynag);