gtk: overwrite the console.c char driver

Instead of registering a vc handler to allocate the Gtk VC Chardev,
overwrite the console.c char driver.

A later patch, when switching to QOM, will register a default console vc
QOM class if none has been registered before.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/sysemu/char.h

@@ -507,9 +507,7 @@ void register_char_driver(const CharDriver *driver);
 
 extern int term_escape_char;
 
-
 /* console.c */
-typedef Chardev *(VcHandler)(ChardevVC *vc, Error **errp);
-void register_vc_handler(VcHandler *handler);
+void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend, Error **errp);
 
 #endif

ui/console.c

@@ -2058,8 +2058,12 @@ static void text_console_do_init(Chardev *chr, DisplayState *ds)
 
 static const CharDriver vc_driver;
 
-static Chardev *text_console_init(ChardevVC *vc, Error **errp)
+static Chardev *vc_init(const CharDriver *driver,
+                        const char *id, ChardevBackend *backend,
+                        ChardevReturn *ret, bool *be_opened,
+                        Error **errp)
 {
+    ChardevVC *vc = backend->u.vc.data;
     ChardevCommon *common = qapi_ChardevVC_base(vc);
     Chardev *chr;
     VCChardev *drv;
@@ -2105,26 +2109,13 @@ static Chardev *text_console_init(ChardevVC *vc, Error **errp)
     if (display_state) {
         text_console_do_init(chr, display_state);
     }
-    return chr;
-}
 
-static VcHandler *vc_handler = text_console_init;
-
-static Chardev *vc_init(const CharDriver *driver,
-                        const char *id, ChardevBackend *backend,
-                        ChardevReturn *ret, bool *be_opened,
-                        Error **errp)
-{
     /* console/chardev init sometimes completes elsewhere in a 2nd
      * stage, so defer OPENED events until they are fully initialized
      */
     *be_opened = false;
-    return vc_handler(backend->u.vc.data, errp);
-}
 
-void register_vc_handler(VcHandler *handler)
-{
-    vc_handler = handler;
+    return chr;
 }
 
 void qemu_console_resize(QemuConsole *s, int width, int height)
@@ -2162,8 +2153,7 @@ PixelFormat qemu_default_pixelformat(int bpp)
     return pf;
 }
 
-static void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend,
-                              Error **errp)
+void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend, Error **errp)
 {
     int val;
     ChardevVC *vc;

ui/gtk.c

@@ -1712,16 +1712,14 @@ static void gd_vc_chr_set_echo(Chardev *chr, bool echo)
 
 static int nb_vcs;
 static Chardev *vcs[MAX_VCS];
+static const CharDriver gd_vc_driver;
 
-static Chardev *gd_vc_handler(ChardevVC *vc, Error **errp)
+static Chardev *vc_init(const CharDriver *driver,
+                        const char *id, ChardevBackend *backend,
+                        ChardevReturn *ret, bool *be_opened,
+                        Error **errp)
 {
-    static const CharDriver gd_vc_driver = {
-        .instance_size = sizeof(VCChardev),
-        .kind = CHARDEV_BACKEND_KIND_VC,
-        .chr_write = gd_vc_chr_write,
-        .chr_set_echo = gd_vc_chr_set_echo,
-    };
-
+    ChardevVC *vc = backend->u.vc.data;
     ChardevCommon *common = qapi_ChardevVC_base(vc);
     Chardev *chr;
 
@@ -1737,9 +1735,22 @@ static Chardev *gd_vc_handler(ChardevVC *vc, Error **errp)
 
     vcs[nb_vcs++] = chr;
 
+    /* console/chardev init sometimes completes elsewhere in a 2nd
+     * stage, so defer OPENED events until they are fully initialized
+     */
+    *be_opened = false;
+
     return chr;
 }
 
+static const CharDriver gd_vc_driver = {
+    .instance_size = sizeof(VCChardev),
+    .kind = CHARDEV_BACKEND_KIND_VC,
+    .parse = qemu_chr_parse_vc, .create = vc_init,
+    .chr_write = gd_vc_chr_write,
+    .chr_set_echo = gd_vc_chr_set_echo,
+};
+
 static gboolean gd_vc_in(VteTerminal *terminal, gchar *text, guint size,
                          gpointer user_data)
 {
@@ -2336,6 +2347,7 @@ void early_gtk_display_init(int opengl)
     }
 
 #if defined(CONFIG_VTE)
-    register_vc_handler(gd_vc_handler);
+    /* overwrite the console.c vc driver */
+    register_char_driver(&gd_vc_driver);
 #endif
 }