curses: fixup SIGWINCH handler mess

[qemu.git] / ui / curses.c

diff --git a/ui/curses.c b/ui/curses.c
index a85a7da316eb3847118ac0c45ceaefdd58e3d13a..dbc3d5ec735c8b15df664ec607fb127e58fb7830 100644 (file)
--- a/ui/curses.c
+++ b/ui/curses.c
@@ -106,9 +106,9 @@ static void curses_resize(DisplayChangeListener *dcl,
     curses_calc_pad();
 }
 
-#ifndef _WIN32
-#if defined(SIGWINCH) && defined(KEY_RESIZE)
-static void curses_winch_handler(int signum)
+#if !defined(_WIN32) && defined(SIGWINCH) && defined(KEY_RESIZE)
+static volatile sig_atomic_t got_sigwinch;
+static void curses_winch_check(void)
 {
     struct winsize {
         unsigned short ws_row;
@@ -117,18 +117,34 @@ static void curses_winch_handler(int signum)
         unsigned short ws_ypixel;   /* unused */
     } ws;
 
-    /* terminal size changed */
-    if (ioctl(1, TIOCGWINSZ, &ws) == -1)
+    if (!got_sigwinch) {
+        return;
+    }
+    got_sigwinch = false;
+
+    if (ioctl(1, TIOCGWINSZ, &ws) == -1) {
         return;
+    }
 
     resize_term(ws.ws_row, ws.ws_col);
-    curses_calc_pad();
     invalidate = 1;
+}
 
-    /* some systems require this */
-    signal(SIGWINCH, curses_winch_handler);
+static void curses_winch_handler(int signum)
+{
+    got_sigwinch = true;
 }
-#endif
+
+static void curses_winch_init(void)
+{
+    struct sigaction old, winch = {
+        .sa_handler  = curses_winch_handler,
+    };
+    sigaction(SIGWINCH, &winch, &old);
+}
+#else
+static void curses_winch_check(void) {}
+static void curses_winch_init(void) {}
 #endif
 
 static void curses_cursor_position(DisplayChangeListener *dcl,
@@ -163,6 +179,8 @@ static void curses_refresh(DisplayChangeListener *dcl)
 {
     int chr, nextchr, keysym, keycode, keycode_alt;
 
+    curses_winch_check();
+
     if (invalidate) {
         clear();
         refresh();
@@ -349,17 +367,11 @@ void curses_display_init(DisplayState *ds, int full_screen)
     curses_keyboard_setup();
     atexit(curses_atexit);
 
-#ifndef _WIN32
-#if defined(SIGWINCH) && defined(KEY_RESIZE)
-    /* some curses implementations provide a handler, but we
-     * want to be sure this is handled regardless of the library */
-    signal(SIGWINCH, curses_winch_handler);
-#endif
-#endif
+    curses_winch_init();
 
     dcl = (DisplayChangeListener *) g_malloc0(sizeof(DisplayChangeListener));
     dcl->ops = &dcl_ops;
-    register_displaychangelistener(ds, dcl);
+    register_displaychangelistener(dcl);
 
     invalidate = 1;
 }