beede1718a
This was a bit harder since even though we handle fatal signals, allowing us to do any last action before GIMP crashes, it seems more memory allocation is not allowed at this time. So creating a dialog or simply getting the return output of gdb into the main process is not allowed. What I do instead is running a separate program (gimpdebug) which will take care of creating the new dialog and running a debugger. I still use GimpCriticalDialog code from this separate binary, while I continue to use this widget also within GIMP for non-fatal errors. The reason why we still want to use it within GIMP is that we can bundle several non-fatal errors and backtrace this way (fatal errors don't return anyway) and it's easier to do so when created from the main process.
126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/* gimpdebug
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* Copyright (C) 2018 Jehan <jehan@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* GimpDebug simply runs a debugger on a given executable and PID and
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* displays a dialog proposing to create a bug report. The reason why it
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* is a separate executable is simply that when the program crashed,
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* even though some actions are possible before exit() by catching fatal
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* errors and signals, it may not be possible anymore to allocate memory
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* anymore. Therefore creating a new dialog, or even just allocating a
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* string with the contents of the debugger are impossible actions.
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* So we call instead a separate program, then exit.
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*
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* Note: this initial version does not handle Windows yet.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <gio/gio.h>
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#include <glib.h>
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#include <glib/gi18n.h>
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#include <gtk/gtk.h>
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#include "app/widgets/gimpcriticaldialog.h"
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static gchar * gimp_debug_get_stack_trace (const gchar *full_prog_name,
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const gchar *pid);
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int
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main (int argc,
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char **argv)
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{
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const gchar *program;
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const gchar *pid;
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const gchar *reason;
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const gchar *message;
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gchar *trace;
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gchar *error;
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GtkWidget *dialog;
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if (argc != 5)
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{
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g_print ("Usage: gimpdebug-2.0 [PROGRAM] [PID] [REASON] [MESSAGE]\n");
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exit (EXIT_FAILURE);
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}
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program = argv[1];
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pid = argv[2];
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reason = argv[3];
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message = argv[4];
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error = g_strdup_printf ("%s: %s", reason, message);
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trace = gimp_debug_get_stack_trace (program, pid);
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if (trace == NULL || strlen (trace) == 0)
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exit (EXIT_FAILURE);
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gtk_init (&argc, &argv);
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dialog = gimp_critical_dialog_new (_("GIMP critical error"));
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gimp_critical_dialog_add (dialog, error, trace, TRUE, program,
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g_ascii_strtoull (pid, NULL, 10));
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g_free (error);
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g_free (trace);
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g_signal_connect (dialog, "delete-event",
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G_CALLBACK (gtk_main_quit), NULL);
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g_signal_connect (dialog, "destroy",
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G_CALLBACK (gtk_main_quit), NULL);
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gtk_widget_show (dialog);
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gtk_main ();
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exit (EXIT_SUCCESS);
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}
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static gchar *
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gimp_debug_get_stack_trace (const gchar *full_prog_name,
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const gchar *pid)
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{
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gchar *trace = NULL;
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/* This works only on UNIX systems. On Windows, we'll have to find
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* another method, probably with DrMingW.
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*/
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#if defined(G_OS_UNIX)
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const gchar *args[7] = { "gdb", "-batch", "-ex", "backtrace full",
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full_prog_name, pid, NULL };
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gchar *gdb_stdout;
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if (g_spawn_sync (NULL, (gchar **) args, NULL,
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G_SPAWN_SEARCH_PATH | G_SPAWN_STDERR_TO_DEV_NULL,
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NULL, NULL, &gdb_stdout, NULL, NULL, NULL))
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{
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trace = g_strdup (gdb_stdout);
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}
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else if (gdb_stdout)
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{
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g_free (gdb_stdout);
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}
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#endif
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return trace;
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}
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