Implement socket sys_close

kernel/src/syscall/fs.rs

@@ -107,8 +107,10 @@ pub fn sys_open(path: *const u8, flags: usize, mode: usize) -> SysResult {
 
 pub fn sys_close(fd: usize) -> SysResult {
     info!("close: fd: {:?}", fd);
-    match process().files.remove(&fd) {
-        Some(_) => Ok(0),
+    let mut proc = process();
+    match proc.files.remove(&fd) {
+        Some(FileLike::File(_)) => Ok(0),
+        Some(FileLike::Socket(handle)) => sys_close_socket(&mut proc, fd, handle),
         None => Err(SysError::EINVAL),
     }
 }

kernel/src/syscall/net.rs

@@ -206,3 +206,15 @@ pub fn sys_recvfrom(
     warn!("sys_recvfrom is unimplemented");
     Err(SysError::EINVAL)
 }
+
+pub fn sys_close_socket(proc: &mut Process, fd: usize, handle: SocketHandle) -> SysResult {
+    let mut socket = proc.sockets.remove(handle);
+    match socket {
+        Socket::Tcp(ref mut tcp_socket) => {
+            tcp_socket.close();
+        }
+        _ => {}
+    }
+
+    Ok(0)
+}