Initial version

1 files changed, 10 insertions, 0 deletions

diff --git a/src/unistd/alarm.c b/src/unistd/alarm.c
new file mode 100644
index 0000000..a5e0c82
--- /dev/null
+++ b/src/unistd/alarm.c
@@ -0,0 +1,10 @@
+#include <unistd.h>
+#include <sys/time.h>
+#include "syscall.h"
+
+unsigned alarm(unsigned seconds)
+{
+	struct itimerval it = { .it_value.tv_sec = seconds }, old = { 0 };
+	setitimer(ITIMER_REAL, &it, &old);
+	return old.it_value.tv_sec + !!old.it_value.tv_usec;
+}