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The feature already exists in our code and produces backtraces upon a crash into a file. The only difference is that we are now getting the file contents and showing it in our new debug dialog, so that it works similarly on all platform (and therefore making the debug info visible to people, otherwise they would never report, even though the data is generated). The difference with gdb/lldb is that it doesn't allow backtraces at random points (for debugging non-fatal yet bad errors). Also the API has just 2 functions and in particular an ExcHndlInit() but no way to unload the feature. So we don't need the debugging page in Preferences because the switch option would not work. On Windows, the feature will be decided at build time only. Last point: the code is untested on Windows so far. I assume it would work, but there is at least one point I am unsure of: will ExcHndl have already generated the backtrace file when gimpdebug runs? If not, I will have to let gimp die first to be able to get the backtrace.
137 lines
3.8 KiB
C
137 lines
3.8 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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const gchar *bt_file = NULL;
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gchar *trace = NULL;
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gchar *error;
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GtkWidget *dialog;
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if (argc != 5 && argc != 6)
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{
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g_print ("Usage: gimpdebug-2.0 [PROGRAM] [PID] [REASON] [MESSAGE] [BT_FILE]\n\n"
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"Note: the backtrace file is optional and only used in Windows.\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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if (argc == 6)
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{
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bt_file = argv[5];
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g_file_get_contents (bt_file, &trace, NULL, NULL);
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}
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else
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{
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trace = gimp_debug_get_stack_trace (program, pid);
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}
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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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