comparison: src/crashCatcher.cc
src/crashCatcher.cc
- changeset 655
- b376645315ab
- child 662
- 2f1bd9112408
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| 654:a74f2ff353b8 | 655:b376645315ab |
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| 1 /* | |
| 2 * LDForge: LDraw parts authoring CAD | |
| 3 * Copyright (C) 2013, 2014 Santeri Piippo | |
| 4 * | |
| 5 * This program is free software: you can redistribute it and/or modify | |
| 6 * it under the terms of the GNU General Public License as published by | |
| 7 * the Free Software Foundation, either version 3 of the License, or | |
| 8 * (at your option) any later version. | |
| 9 * | |
| 10 * This program is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 * GNU General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License | |
| 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 17 */ | |
| 18 | |
| 19 #ifdef __unix__ | |
| 20 | |
| 21 #include <QString> | |
| 22 #include <QProcess> | |
| 23 #include <QTemporaryFile> | |
| 24 #include <QMessageBox> | |
| 25 #include <unistd.h> | |
| 26 #include <signal.h> | |
| 27 | |
| 28 #ifdef Q_OS_LINUX | |
| 29 # include <sys/prctl.h> | |
| 30 #endif | |
| 31 | |
| 32 #include "crashCatcher.h" | |
| 33 #include "basics.h" | |
| 34 #include "dialogs.h" | |
| 35 | |
| 36 // Is the crash catcher active now? | |
| 37 static bool g_crashCatcherActive = false; | |
| 38 | |
| 39 // If an assertion failed, what was it? | |
| 40 static QString g_assertionFailure; | |
| 41 | |
| 42 // List of signals to catch and crash on | |
| 43 static QList<int> g_signalsToCatch ({ | |
| 44 SIGSEGV, // segmentation fault | |
| 45 SIGABRT, // abort() calls | |
| 46 SIGFPE, // floating point exceptions (e.g. division by zero) | |
| 47 SIGILL, // illegal instructions | |
| 48 }); | |
| 49 | |
| 50 // ============================================================================= | |
| 51 // | |
| 52 static void handleCrash (int sig) | |
| 53 { | |
| 54 printf ("%s: crashed with signal %d, launching gdb\n", __func__, sig); | |
| 55 | |
| 56 if (g_crashCatcherActive) | |
| 57 { | |
| 58 printf ("caught signal while crash catcher is active!\n"); | |
| 59 exit (149); | |
| 60 } | |
| 61 | |
| 62 const pid_t pid = getpid(); | |
| 63 QProcess proc; | |
| 64 QTemporaryFile commandsFile; | |
| 65 | |
| 66 g_crashCatcherActive = true; | |
| 67 | |
| 68 if (commandsFile.open()) | |
| 69 { | |
| 70 commandsFile.write (format ("attach %1\n", pid).toLocal8Bit()); | |
| 71 commandsFile.write (QString ("backtrace full\n").toLocal8Bit()); | |
| 72 commandsFile.write (QString ("detach\n").toLocal8Bit()); | |
| 73 commandsFile.write (QString ("quit").toLocal8Bit()); | |
| 74 commandsFile.flush(); | |
| 75 commandsFile.close(); | |
| 76 } | |
| 77 | |
| 78 QStringList args ({"-x", commandsFile.fileName()}); | |
| 79 | |
| 80 proc.start ("gdb", args); | |
| 81 | |
| 82 // Linux doesn't allow ptrace to be used on anything but direct child processes | |
| 83 // so we need to use prctl to register an exception to this to allow GDB attach to us. | |
| 84 // We need to do this now and no earlier because only now we actually know GDB's PID. | |
| 85 #ifdef Q_OS_LINUX | |
| 86 prctl (PR_SET_PTRACER, proc.pid(), 0, 0, 0); | |
| 87 #endif | |
| 88 | |
| 89 proc.waitForFinished (1000); | |
| 90 QString output = QString (proc.readAllStandardOutput()); | |
| 91 QString err = QString (proc.readAllStandardError()); | |
| 92 | |
| 93 bombBox (format ("<h3>Program crashed with signal %1</h3>\n\n" | |
| 94 "%2" | |
| 95 "<p><b>GDB <tt>stdout</tt>:</b></p><pre>%3</pre>\n" | |
| 96 "<p><b>GDB <tt>stderr</tt>:</b></p><pre>%4</pre>", | |
| 97 sig, (!g_assertionFailure.isEmpty()) ? g_assertionFailure : "", output, err)); | |
| 98 } | |
| 99 | |
| 100 // ============================================================================= | |
| 101 // | |
| 102 void initCrashCatcher() | |
| 103 { | |
| 104 struct sigaction sighandler; | |
| 105 sighandler.sa_handler = &handleCrash; | |
| 106 sighandler.sa_flags = 0; | |
| 107 sigemptyset (&sighandler.sa_mask); | |
| 108 | |
| 109 for (int sig : g_signalsToCatch) | |
| 110 sigaction (sig, &sighandler, null); | |
| 111 | |
| 112 print ("%1: crash catcher hooked to signals: %2\n", __func__, g_signalsToCatch); | |
| 113 } | |
| 114 #endif // #ifdef __unix__ | |
| 115 | |
| 116 // ============================================================================= | |
| 117 // | |
| 118 // This function must be readily available in both Windows and Linux. We display | |
| 119 // the bomb box straight in Windows while in Linux we let abort() trigger the | |
| 120 // signal handler, which will cause the usual bomb box with GDB diagnostics. | |
| 121 // Said prompt will embed the assertion failure information. | |
| 122 // | |
| 123 void assertionFailure (const char* file, int line, const char* funcname, const char* expr) | |
| 124 { | |
| 125 QString errmsg = format ( | |
| 126 "<p><b>File</b>: <tt>%1</tt><br />" | |
| 127 "<b>Line</b>: <tt>%2</tt><br />" | |
| 128 "<b>Function:</b> <tt>%3</tt></p>" | |
| 129 "<p>Assertion <b><tt>`%4'</tt></b> failed.</p>", | |
| 130 file, line, funcname, expr); | |
| 131 | |
| 132 g_assertionFailure = errmsg; | |
| 133 | |
| 134 #ifndef __unix__ | |
| 135 bombBox (errmsg); | |
| 136 #endif | |
| 137 | |
| 138 abort(); | |
| 139 } |
