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/* Metacity 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 <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);
}
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);
g_assert (restored_error_handler == 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;
XGetErrorText (xdisplay, error->error_code, buf, 63);
display = meta_display_for_x_display (xdisplay);
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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