实现gettimeofday()系统调用和clocksource+timekeeping子模块 (#278)

- 实现gettimeofday()系统调用
- 实现clocksource+timekeeping子模块部分功能
- 实现了timespec转换成日期时间

kernel/src/net/net_core.rs

@@ -15,13 +15,16 @@ use super::socket::{SOCKET_SET, SOCKET_WAITQUEUE};
 /// The network poll function, which will be called by timer.
 ///
 /// The main purpose of this function is to poll all network interfaces.
-struct NetWorkPollFunc();
+#[derive(Debug)]
+struct NetWorkPollFunc;
+
 impl TimerFunction for NetWorkPollFunc {
-    fn run(&mut self) {
+    fn run(&mut self) -> Result<(), SystemError> {
         poll_ifaces_try_lock(10).ok();
         let next_time = next_n_ms_timer_jiffies(10);
-        let timer = Timer::new(Box::new(NetWorkPollFunc()), next_time);
+        let timer = Timer::new(Box::new(NetWorkPollFunc), next_time);
         timer.activate();
+        return Ok(());
     }
 }
 
@@ -29,7 +32,7 @@ pub fn net_init() -> Result<(), SystemError> {
     dhcp_query()?;
     // Init poll timer function
     let next_time = next_n_ms_timer_jiffies(5);
-    let timer = Timer::new(Box::new(NetWorkPollFunc()), next_time);
+    let timer = Timer::new(Box::new(NetWorkPollFunc), next_time);
     timer.activate();
     return Ok(());
 }