finish sleep after getdents.

mysystem_call.c

@@ -86,6 +86,21 @@ long sys_getcwd(char *buf,size_t size)
     return 0;
 }
 int sys_sleep(unsigned int seconds)
+{
+    sys_signal(SIGALRM,SIG_IGN);
+    sys_alarm(seconds);
+    if(sys_pause()!=-1)
+    {
+        printk("sleep\n");
+        return 0;
+    }
+    
+    
+    printk("do not sleep\n");
+    return -1;
+}
+
+int sys_something()
 {
     return 0;
 }