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-rw-r--r--src/core/errors.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/src/core/errors.c b/src/core/errors.c
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--- /dev/null
+++ b/src/core/errors.c
@@ -0,0 +1,288 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+
+/* Marco X error handling */
+
+/*
+ * Copyright (C) 2001 Havoc Pennington, error trapping inspired by GDK
+ * code copyrighted by the GTK team.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include <config.h>
+#include "errors.h"
+#include "display-private.h"
+#include <errno.h>
+#include <stdlib.h>
+#include <gdk/gdk.h>
+
+static int x_error_handler (Display *display,
+ XErrorEvent *error);
+static int x_io_error_handler (Display *display);
+
+void
+meta_errors_init (void)
+{
+ XSetErrorHandler (x_error_handler);
+ XSetIOErrorHandler (x_io_error_handler);
+}
+
+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
+ */
+
+ int (* restored_error_handler) (Display *,
+ XErrorEvent *);
+
+ restored_error_handler = 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;
+}
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