diff --git a/sleep.c b/sleep.c
new file mode 100644
index 0000000..e60c38a
--- /dev/null
+++ b/sleep.c
@@ -0,0 +1,30 @@
+#include<stdio.h>
+#include<signal.h>
+#include<unistd.h>
+void sigAlrm(int signal)
+{}
+
+unsigned int mysleep(unsigned int second)
+{
+    struct sigaction sig,osig;
+    sig.sa_handler = sigAlrm;
+    sigemptyset(&sig.sa_mask);
+    sig.sa_flags = 0;
+
+    sigaction(SIGALRM,&sig,&osig);
+    alarm(second);
+    pause();
+    unsigned int ret = alarm(0);
+    sigaction(SIGALRM,&sig,NULL);
+    return ret;
+}
+
+int main()
+{
+    while(1)
+    {
+        mysleep(2);
+        printf("sleep 2 second\n");
+    }
+    return 0;
+}