1 files changed, 34 insertions, 0 deletions
diff --git a/lib/mlibc/tests/posix/alarm.c b/lib/mlibc/tests/posix/alarm.c
new file mode 100644
index 0000000..b8a43e3
--- /dev/null
+++ b/lib/mlibc/tests/posix/alarm.c
@@ -0,0 +1,34 @@
+#include <signal.h>
+#include <assert.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static volatile int alarms_fired = 0;
+
+static void sigalrm_handler(int signal) {
+	if(signal == SIGALRM)
+		alarms_fired++;
+}
+
+int main() {
+	signal(SIGALRM, sigalrm_handler);
+
+	alarms_fired = 0;
+
+	unsigned int ret = alarm(10);
+	assert(!ret);
+
+	sleep(1);
+
+	ret = alarm(1);
+	assert(ret == 9);
+
+	sleep(2);
+
+	if(alarms_fired != 1) {
+		fprintf(stderr, "alarm handler fired %u times instead of 1\n", alarms_fired);
+		exit(1);
+	}
+}