curses: fixup SIGWINCH handler mess

[qemu.git] / ui / curses.c

diff --git a/ui/curses.c b/ui/curses.c
index d78e378440044a96d544126b9eebd640ab5b6111..dbc3d5ec735c8b15df664ec607fb127e58fb7830 100644 (file)
--- a/ui/curses.c
+++ b/ui/curses.c
@@ -35,12 +35,14 @@
 #define FONT_HEIGHT 16
 #define FONT_WIDTH 8
 
+static DisplayChangeListener *dcl;
 static console_ch_t screen[160 * 100];
 static WINDOW *screenpad = NULL;
 static int width, height, gwidth, gheight, invalidate;
 static int px, py, sminx, sminy, smaxx, smaxy;
 
-static void curses_update(DisplayState *ds, int x, int y, int w, int h)
+static void curses_update(DisplayChangeListener *dcl,
+                          int x, int y, int w, int h)
 {
     chtype *line;
 
@@ -54,7 +56,7 @@ static void curses_update(DisplayState *ds, int x, int y, int w, int h)
 
 static void curses_calc_pad(void)
 {
-    if (is_fixedsize_console()) {
+    if (qemu_console_is_fixedsize(NULL)) {
         width = gwidth;
         height = gheight;
     } else {
@@ -91,7 +93,8 @@ static void curses_calc_pad(void)
     }
 }
 
-static void curses_resize(DisplayState *ds, int width, int height)
+static void curses_resize(DisplayChangeListener *dcl,
+                          int width, int height)
 {
     if (width == gwidth && height == gheight) {
         return;
@@ -103,9 +106,9 @@ static void curses_resize(DisplayState *ds, int width, int height)
     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;
@@ -114,21 +117,38 @@ 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(DisplayState *ds, int x, int y)
+static void curses_cursor_position(DisplayChangeListener *dcl,
+                                   int x, int y)
 {
     if (x >= 0) {
         x = sminx + x - px;
@@ -139,8 +159,9 @@ static void curses_cursor_position(DisplayState *ds, int x, int y)
             curs_set(1);
             /* it seems that curs_set(1) must always be called before
              * curs_set(2) for the latter to have effect */
-            if (!is_graphic_console())
+            if (!qemu_console_is_graphic(NULL)) {
                 curs_set(2);
+            }
             return;
         }
     }
@@ -154,19 +175,21 @@ static void curses_cursor_position(DisplayState *ds, int x, int y)
 
 static kbd_layout_t *kbd_layout = NULL;
 
-static void curses_refresh(DisplayState *ds)
+static void curses_refresh(DisplayChangeListener *dcl)
 {
     int chr, nextchr, keysym, keycode, keycode_alt;
 
+    curses_winch_check();
+
     if (invalidate) {
         clear();
         refresh();
         curses_calc_pad();
-        vga_hw_invalidate();
+        graphic_hw_invalidate(NULL);
         invalidate = 0;
     }
 
-    vga_hw_text_update(screen);
+    graphic_hw_text_update(NULL, screen);
 
     nextchr = ERR;
     while (1) {
@@ -187,7 +210,7 @@ static void curses_refresh(DisplayState *ds)
             clear();
             refresh();
             curses_calc_pad();
-            curses_update(ds, 0, 0, width, height);
+            curses_update(dcl, 0, 0, width, height);
             continue;
         }
 #endif
@@ -248,7 +271,7 @@ static void curses_refresh(DisplayState *ds)
         if (keycode == -1)
             continue;
 
-        if (is_graphic_console()) {
+        if (qemu_console_is_graphic(NULL)) {
             /* since terminals don't know about key press and release
              * events, we need to emit both for each key received */
             if (keycode & SHIFT)
@@ -323,9 +346,16 @@ static void curses_keyboard_setup(void)
     }
 }
 
+static const DisplayChangeListenerOps dcl_ops = {
+    .dpy_name        = "curses",
+    .dpy_text_update = curses_update,
+    .dpy_text_resize = curses_resize,
+    .dpy_refresh     = curses_refresh,
+    .dpy_text_cursor = curses_cursor_position,
+};
+
 void curses_display_init(DisplayState *ds, int full_screen)
 {
-    DisplayChangeListener *dcl;
 #ifndef _WIN32
     if (!isatty(1)) {
         fprintf(stderr, "We need a terminal output\n");
@@ -337,20 +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->dpy_text_update = curses_update;
-    dcl->dpy_text_resize = curses_resize;
-    dcl->dpy_refresh = curses_refresh;
-    dcl->dpy_text_cursor = curses_cursor_position;
-    register_displaychangelistener(ds, dcl);
+    dcl->ops = &dcl_ops;
+    register_displaychangelistener(dcl);
 
     invalidate = 1;
 }