-#if !GTK_CHECK_VERSION (3, 0, 0)

-static int x_error_handler (Display *display,

- XErrorEvent *error);

-static int x_io_error_handler (Display *display);

-#endif

-

-void

-meta_errors_init (void)

-{

-#if !GTK_CHECK_VERSION (3, 0, 0)

- XSetErrorHandler (x_error_handler);

- XSetIOErrorHandler (x_io_error_handler);

-#endif

-}

-

-#if GTK_CHECK_VERSION (3, 0, 0)

-

-#else

-

-typedef struct ForeignDisplay ForeignDisplay;

-

-struct ForeignDisplay

-{

- Display *dpy;

- ErrorHandler handler;

- gpointer data;

- ForeignDisplay *next;

-};

-

-static ForeignDisplay *foreign_displays;

-

-void

-meta_errors_register_foreign_display (Display *foreign_dpy,

- ErrorHandler handler,

- gpointer data)

-{

- ForeignDisplay *info = g_new0 (ForeignDisplay, 1);

- info->dpy = foreign_dpy;

- info->handler = handler;

- info->data = data;

- info->next = foreign_displays;

- foreign_displays = info;

-}

-

-static void

-meta_error_trap_push_internal (MetaDisplay *display,

- gboolean need_sync)

-{

- /* GDK resets the error handler on each push */

- int (* old_error_handler) (Display *,

- XErrorEvent *);

-

- if (need_sync)

- {

- XSync (display->xdisplay, False);

- }

-

- gdk_error_trap_push ();

-

- /* old_error_handler will just be equal to x_error_handler

- * for nested traps

- */

- old_error_handler = XSetErrorHandler (x_error_handler);

-

- /* Replace GDK handler, but save it so we can chain up */

- if (display->error_trap_handler == NULL)

- {

- g_assert (display->error_traps == 0);

- display->error_trap_handler = old_error_handler;

- g_assert (display->error_trap_handler != x_error_handler);

- }

-

- display->error_traps += 1;

-

- meta_topic (META_DEBUG_ERRORS, "%d traps remain\n", display->error_traps);

-}

-

-static int

-meta_error_trap_pop_internal (MetaDisplay *display,

- gboolean need_sync)

-{

- int result;

-

- g_assert (display->error_traps > 0);

-

- if (need_sync)

- {

- XSync (display->xdisplay, False);

- }

-

- result = gdk_error_trap_pop ();

-

- display->error_traps -= 1;

-

- if (display->error_traps == 0)

- {

- /* check that GDK put our handler back; this

- * assumes that there are no pending GDK traps from GDK itself

- */

-

- XSetErrorHandler (x_error_handler);

-

- /* remove this */

- display->error_trap_handler = NULL;

- }

-

- meta_topic (META_DEBUG_ERRORS, "%d traps\n", display->error_traps);

-

- return result;

-}

-

-void

-meta_error_trap_push (MetaDisplay *display)

-{

- meta_error_trap_push_internal (display, FALSE);

-}

-

-void

-meta_error_trap_pop (MetaDisplay *display,

- gboolean last_request_was_roundtrip)

-{

- gboolean need_sync;

-

- /* we only have to sync when popping the outermost trap */

- need_sync = (display->error_traps == 1 && !last_request_was_roundtrip);

-

- if (need_sync)

- meta_topic (META_DEBUG_SYNC, "Syncing on error_trap_pop, traps = %d, roundtrip = %d\n",

- display->error_traps, last_request_was_roundtrip);

-

- display->error_trap_synced_at_last_pop = need_sync || last_request_was_roundtrip;

-

- meta_error_trap_pop_internal (display, need_sync);

-}

-

-void

-meta_error_trap_push_with_return (MetaDisplay *display)

-{

- gboolean need_sync;

-

- /* We don't sync on push_with_return if there are no traps

- * currently, because we assume that any errors were either covered

- * by a previous pop, or were fatal.

- *

- * More generally, we don't sync if we were synchronized last time

- * we popped. This is known to be the case if there are no traps,

- * but we also keep a flag so we know whether it's the case otherwise.

- */

-

- if (!display->error_trap_synced_at_last_pop)

- need_sync = TRUE;

- else

- need_sync = FALSE;

-

- if (need_sync)

- meta_topic (META_DEBUG_SYNC, "Syncing on error_trap_push_with_return, traps = %d\n",

- display->error_traps);

-

- meta_error_trap_push_internal (display, FALSE);

-}

-

-int

-meta_error_trap_pop_with_return (MetaDisplay *display,

- gboolean last_request_was_roundtrip)

-{

- if (!last_request_was_roundtrip)

- meta_topic (META_DEBUG_SYNC, "Syncing on error_trap_pop_with_return, traps = %d, roundtrip = %d\n",

- display->error_traps, last_request_was_roundtrip);

-

- display->error_trap_synced_at_last_pop = TRUE;

-

- return meta_error_trap_pop_internal (display,

- !last_request_was_roundtrip);

-}

-

-static int

-x_error_handler (Display *xdisplay,

- XErrorEvent *error)

-{

- int retval;

- gchar buf[64];

- MetaDisplay *display;

- ForeignDisplay *foreign;

-

- for (foreign = foreign_displays; foreign != NULL; foreign = foreign->next)

- {

- if (foreign->dpy == xdisplay)

- {

- foreign->handler (xdisplay, error, foreign->data);

-

- return 0;

- }

- }

-

- XGetErrorText (xdisplay, error->error_code, buf, 63);

-

- display = meta_display_for_x_display (xdisplay);

-

- /* Display can be NULL here because the compositing manager

- * has its own Display, but Xlib only has one global error handler

- */

- if (display->error_traps > 0)

- {

- /* we're in an error trap, chain to the trap handler

- * saved from GDK

- */

- meta_verbose ("X error: %s serial %ld error_code %d request_code %d minor_code %d)\n",

- buf,

- error->serial,

- error->error_code,

- error->request_code,

- error->minor_code);

-

- g_assert (display->error_trap_handler != NULL);

- g_assert (display->error_trap_handler != x_error_handler);

-

- retval = (* display->error_trap_handler) (xdisplay, error);

- }

- else

- {

- meta_bug ("Unexpected X error: %s serial %ld error_code %d request_code %d minor_code %d)\n",

- buf,

- error->serial,

- error->error_code,

- error->request_code,

- error->minor_code);

-

- retval = 1; /* compiler warning */

- }

-

- return retval;

-}

-

-static int

-x_io_error_handler (Display *xdisplay)

-{

- MetaDisplay *display;

-

- display = meta_display_for_x_display (xdisplay);

-

- if (display == NULL)

- meta_bug ("IO error received for unknown display?\n");

-

- if (errno == EPIPE)

- {

- meta_warning (_("Lost connection to the display '%s';\n"

- "most likely the X server was shut down or you killed/destroyed\n"

- "the window manager.\n"),

- display->name);

- }

- else

- {

- meta_warning (_("Fatal IO error %d (%s) on display '%s'.\n"),

- errno, g_strerror (errno),

- display->name);

- }

-

- /* Xlib would force an exit anyhow */

- exit (1);

-

- return 0;

-}

-

-#endif