1 files changed, 29 insertions, 0 deletions
diff --git a/klibc/klibc/alarm.c b/klibc/klibc/alarm.c
new file mode 100644
index 0000000000..ca7bb37f92
--- /dev/null
+++ b/klibc/klibc/alarm.c
@@ -0,0 +1,29 @@
+/*
+ * alarm.c
+ */
+
+#include <sys/time.h>
+#include <sys/syscall.h>
+
+#ifdef __NR_alarm
+
+_syscall1(unsigned int,alarm,unsigned int,seconds);
+
+#else
+
+/* Emulate alarm() via setitimer() */
+
+unsigned int alarm(unsigned int seconds)
+{
+  struct itimerval iv;
+
+  iv.it_interval.tv_sec = iv.it_interval.tv_usec = 0;
+  iv.it_value.tv_sec = seconds;
+  iv.it_value.tv_usec = 0;
+
+  setitimer(ITIMER_REAL, &iv, &iv);
+
+  return iv.it_value.tv_sec + (iv.it_value.tv_usec ? 1 : 0);
+}
+
+#endif