From 28a029a4990d2a84f9d6a0b890eba812ea503998 Mon Sep 17 00:00:00 2001 From: Perberos Date: Thu, 1 Dec 2011 23:52:01 -0300 Subject: moving from https://github.com/perberos/mate-desktop-environment --- src/core/errors.c | 288 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 288 insertions(+) create mode 100644 src/core/errors.c (limited to 'src/core/errors.c') diff --git a/src/core/errors.c b/src/core/errors.c new file mode 100644 index 00000000..3b2a6334 --- /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 +#include "errors.h" +#include "display-private.h" +#include +#include +#include + +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; +} -- cgit v1.2.1