Replace signal() with sigaction()

The man page for signal(3) reads:

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

1 files changed, 2 insertions, 1 deletions

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);