comparison: src/crashCatcher.cpp
src/crashCatcher.cpp
- changeset 931
- 85080f7a1c20
- parent 927
- 409b82a4765e
- child 941
- f895379d7fab
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| 929:66e8453e1768 | 931:85080f7a1c20 |
|---|---|
| 1 /* | |
| 2 * LDForge: LDraw parts authoring CAD | |
| 3 * Copyright (C) 2013 - 2015 Teemu 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 #include <QProcess> | |
| 20 #include <QTemporaryFile> | |
| 21 #include <unistd.h> | |
| 22 #include <signal.h> | |
| 23 #include "crashCatcher.h" | |
| 24 #include "dialogs.h" | |
| 25 | |
| 26 #ifdef __unix__ | |
| 27 # ifdef Q_OS_LINUX | |
| 28 # include <sys/prctl.h> | |
| 29 # endif | |
| 30 | |
| 31 // Is the crash catcher active now? | |
| 32 static bool IsCrashCatcherActive = false; | |
| 33 | |
| 34 // If an assertion failed, what was it? | |
| 35 static QString AssertionFailureText; | |
| 36 | |
| 37 // List of signals to catch and crash on | |
| 38 static QList<int> SignalsToCatch ({ | |
| 39 SIGSEGV, // segmentation fault | |
| 40 SIGABRT, // abort() calls | |
| 41 SIGFPE, // floating point exceptions (e.g. division by zero) | |
| 42 SIGILL, // illegal instructions | |
| 43 }); | |
| 44 | |
| 45 // ------------------------------------------------------------------------------------------------- | |
| 46 // | |
| 47 // Removes the signal handler from SIGABRT and then aborts. | |
| 48 // | |
| 49 static void FinalAbort() | |
| 50 { | |
| 51 struct sigaction sighandler; | |
| 52 sighandler.sa_handler = SIG_DFL; | |
| 53 sighandler.sa_flags = 0; | |
| 54 sigaction (SIGABRT, &sighandler, 0); | |
| 55 abort(); | |
| 56 } | |
| 57 | |
| 58 // ------------------------------------------------------------------------------------------------- | |
| 59 // | |
| 60 static void HandleCrash (int sig) | |
| 61 { | |
| 62 printf ("!! Caught signal %d, launching gdb\n", sig); | |
| 63 | |
| 64 if (IsCrashCatcherActive) | |
| 65 { | |
| 66 printf ("Caught signal while crash catcher is active! Execution cannot continue.\n"); | |
| 67 FinalAbort(); | |
| 68 } | |
| 69 | |
| 70 pid_t const pid (getpid()); | |
| 71 QProcess proc; | |
| 72 QTemporaryFile commandsFile; | |
| 73 | |
| 74 IsCrashCatcherActive = true; | |
| 75 | |
| 76 if (commandsFile.open()) | |
| 77 { | |
| 78 commandsFile.write (format ("attach %1\n", pid).toLocal8Bit()); | |
| 79 commandsFile.write (QString ("backtrace full\n").toLocal8Bit()); | |
| 80 commandsFile.write (QString ("detach\n").toLocal8Bit()); | |
| 81 commandsFile.write (QString ("quit").toLocal8Bit()); | |
| 82 commandsFile.close(); | |
| 83 } | |
| 84 | |
| 85 proc.start ("gdb", {"-x", commandsFile.fileName()}); | |
| 86 | |
| 87 // Linux doesn't allow ptrace to be used on anything but direct child processes | |
| 88 // so we need to use prctl to register an exception to this to allow GDB attach to us. | |
| 89 // We need to do this now and no earlier because only now we actually know GDB's PID. | |
| 90 #ifdef Q_OS_LINUX | |
| 91 prctl (PR_SET_PTRACER, proc.pid(), 0, 0, 0); | |
| 92 #endif | |
| 93 | |
| 94 proc.waitForFinished (1000); | |
| 95 QString output (proc.readAllStandardOutput()); | |
| 96 QString err (proc.readAllStandardError()); | |
| 97 QFile f (UNIXNAME "-crash.log"); | |
| 98 | |
| 99 if (f.open (QIODevice::WriteOnly)) | |
| 100 { | |
| 101 fprint (f, format ("=== Program crashed with signal %1 ===\n\n%2" | |
| 102 "GDB stdout:\n%3\nGDB stderr:\n%4\n", sig, | |
| 103 (not AssertionFailureText.isEmpty()) ? AssertionFailureText + "\n\n" : "", | |
| 104 output, err)); | |
| 105 f.close(); | |
| 106 } | |
| 107 | |
| 108 if (not AssertionFailureText.isEmpty()) | |
| 109 printf ("Assertion failed: \"%s\".\n", qPrintable (AssertionFailureText)); | |
| 110 | |
| 111 printf ("Backtrace written to " UNIXNAME "-crash.log. Aborting.\n"); | |
| 112 FinalAbort(); | |
| 113 } | |
| 114 | |
| 115 // ------------------------------------------------------------------------------------------------- | |
| 116 // | |
| 117 // Initializes the crash catcher. | |
| 118 // | |
| 119 void InitCrashCatcher() | |
| 120 { | |
| 121 struct sigaction sighandler; | |
| 122 sighandler.sa_handler = &HandleCrash; | |
| 123 sighandler.sa_flags = 0; | |
| 124 sigemptyset (&sighandler.sa_mask); | |
| 125 | |
| 126 for (int sig : SignalsToCatch) | |
| 127 { | |
| 128 if (sigaction (sig, &sighandler, null) == -1) | |
| 129 { | |
| 130 fprint (stderr, "Couldn't set signal handler %1: %2", sig, strerror (errno)); | |
| 131 SignalsToCatch.removeOne (sig); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 print ("Crash catcher hooked to signals: %1\n", SignalsToCatch); | |
| 136 } | |
| 137 | |
| 138 #endif // #ifdef __unix__ | |
| 139 | |
| 140 // ------------------------------------------------------------------------------------------------- | |
| 141 // | |
| 142 // This function catches an assertion failure. It must be readily available in both Windows and | |
| 143 // Linux. We display the bomb box straight in Windows while in Linux we let abort() trigger | |
| 144 // the signal handler, which will cause the usual bomb box with GDB diagnostics. Said prompt will | |
| 145 // embed the assertion failure information. | |
| 146 // | |
| 147 void HandleAssertFailure (const char* file, int line, const char* funcname, const char* expr) | |
| 148 { | |
| 149 #ifdef __unix__ | |
| 150 AssertionFailureText = format ("%1:%2: %3: %4", file, line, funcname, expr); | |
| 151 #else | |
| 152 DisplayBombBox (format ( | |
| 153 "<p><b>File</b>: <tt>%1</tt><br />" | |
| 154 "<b>Line</b>: <tt>%2</tt><br />" | |
| 155 "<b>Function:</b> <tt>%3</tt></p>" | |
| 156 "<p>Assertion <b><tt>`%4'</tt></b> failed.</p>", | |
| 157 file, line, funcname, expr)); | |
| 158 #endif | |
| 159 | |
| 160 abort(); | |
| 161 } |
