get rid of __attribute__((constructor))

Explicit is better than implicit.

1 files changed, 43 insertions, 0 deletions

diff --git a/src/signal.c b/src/signal.c
index b5c27ec..d721f67 100644
--- a/src/signal.c
+++ b/src/signal.c
@@ -6,12 +6,55 @@
  */
 
 #include "signal.h"
+#include "compiler.h"
 #include "log.h"
 
 #include <signal.h>
+#include <string.h>
 
 volatile sig_atomic_t global_stop_flag = 0;
 
+static void set_global_stop_flag(UNUSED int signum)
+{
+	global_stop_flag = 1;
+}
+
+static int my_sigaction(int signo, const struct sigaction *act)
+{
+	int ret = 0;
+
+	ret = sigaction(signo, act, NULL);
+	if (ret < 0) {
+		log_errno("sigaction");
+		return ret;
+	}
+
+	return ret;
+}
+
+int signal_install_global_handler()
+{
+	int ret = 0;
+
+	struct sigaction sa;
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = set_global_stop_flag;
+
+	/* Don't care about proper cleanup here; we exit the program if this
+	 * fails anyway. */
+	ret = my_sigaction(SIGINT, &sa);
+	if (ret < 0)
+		return ret;
+	ret = my_sigaction(SIGQUIT, &sa);
+	if (ret < 0)
+		return ret;
+	ret = my_sigaction(SIGTERM, &sa);
+	if (ret < 0)
+		return ret;
+
+	return ret;
+}
+
 int signal_set(const sigset_t *new, sigset_t *old)
 {
 	int ret = 0;