6 files changed, 45 insertions, 25 deletions
diff --git a/src/line/cursor.cc b/src/line/cursor.cc
index 81454ae..1baa33c 100644
--- a/src/line/cursor.cc
+++ b/src/line/cursor.cc
@@ -228,6 +228,7 @@ void T_line_editor::check_window_update()
     {
         update_window_size();
         clear_below();
+        print_override(line_buffer);
         windows_size_changed = false;
     }
 }
diff --git a/src/line/input.cc b/src/line/input.cc
index b7dbc23..1e7ca38 100644
--- a/src/line/input.cc
+++ b/src/line/input.cc
@@ -5,6 +5,8 @@
 #include <unistd.h>
 
 #include "history.h"
+#include "util/non_block_input.h"
+#include "pipe.h"
 
 using namespace std;
 
@@ -25,9 +27,15 @@ string T_line_editor::readline()
 
     T_position pos = get_cursor_position();
     prompt_pos = pos.col;
-    char c;
-    while (read(STDIN_FILENO, &c, 1) == 1)
+    char c; int src;
+    while (non_block_read_char(&c, &src) == 1)
     {
+        // if signal'd
+        if (src == self_pipe_fd[0])
+        {
+            check_window_update();
+            break;
+        }
         if (iscntrl(c))
         {
             //print("control: {}\r\n", static_cast<unsigned char>(c));
diff --git a/src/pipe.cc b/src/pipe.cc
new file mode 100644
index 0000000..5baaeae
--- /dev/null
+++ b/src/pipe.cc
@@ -0,0 +1,32 @@
+#include "pipe.h"
+
+#include <unistd.h>
+#include <cstdlib>
+#include <fcntl.h>
+
+#include "error.h"
+
+namespace ov4
+{
+
+void self_pipe_init()
+{
+    int ret = pipe2(self_pipe_fd, O_NONBLOCK);
+    if (ret != 0)
+    {
+        throw T_error(error_code::FAIL_TO_OPEN_PIPE, "Fail to open self pipe");
+    }
+}
+
+/*
+ * write a byte to self pipe
+ * NB: you can ONLY determine that signal handler was called
+ * but CANNOT determine the number of callings, or which signal was called
+ * because when the pipe is full, nothing will be written
+ */
+int self_pipe_write()
+{
+    return write(self_pipe_fd[1], &SELF_PIPE_BYTE, 1);
+}
+
+}
+\ No newline at end of file
diff --git a/src/self_pipe.cc b/src/self_pipe.cc
deleted file mode 100644
index 42e61d8..0000000
--- a/src/self_pipe.cc
+++ /dev/null
@@ -1,21 +0,0 @@
-#include "pipe.h"
-
-#include <unistd.h>
-#include <cstdlib>
-#include <fcntl.h>
-
-#include "error.h"
-
-namespace ov4
-{
-
-void self_pipe_init()
-{
-    int ret = pipe2(self_pipe_fd, O_NONBLOCK);
-    if (ret != 0)
-    {
-        throw T_error(error_code::FAIL_TO_OPEN_PIPE, "Fail to open self pipe");
-    }
-}
-
-}
-\ No newline at end of file
diff --git a/src/signal/sigwinch_handler.cc b/src/signal/sigwinch_handler.cc
index 4b692ed..20d4550 100644
--- a/src/signal/sigwinch_handler.cc
+++ b/src/signal/sigwinch_handler.cc
@@ -1,6 +1,6 @@
 #include "signal_handler.h"
 
-#include "line/getter.h"
+#include "line/line_editor.h"
 
 namespace ov4
 {
diff --git a/src/util/non_block_io.cc b/src/util/non_block_input.cc
index 31edbc9..a17daf2 100644
--- a/src/util/non_block_io.cc
+++ b/src/util/non_block_input.cc
@@ -41,7 +41,7 @@ int non_block_read_char(char *c, int *src)
     else if (FD_ISSET(STDIN_FILENO, &rset))
     {
         ret = read(STDIN_FILENO, c, 1);
-        if (src != nullptr) *src = self_pipe_fd[0];
+        if (src != nullptr) *src = STDIN_FILENO;
     }
     return ret;
 }