comparison: src/crashcatcher.cpp
src/crashcatcher.cpp
- changeset 514
- d78fea0f664c
- parent 513
- 29eb671b34f6
- child 528
- e38d199ef9aa
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replaced
| 513:29eb671b34f6 | 514:d78fea0f664c |
|---|---|
| 25 SIGILL, // illegal instructions | 25 SIGILL, // illegal instructions |
| 26 }); | 26 }); |
| 27 | 27 |
| 28 // ============================================================================= | 28 // ============================================================================= |
| 29 // ----------------------------------------------------------------------------- | 29 // ----------------------------------------------------------------------------- |
| 30 static void handleSignal (int sig) | 30 static void handleCrash (int sig) |
| 31 { printf ("caught signal %d\n", sig); | 31 { printf ("%s: crashed with signal %d, launching gdb\n", __func__, sig); |
| 32 | 32 |
| 33 if (g_crashCatcherActive) | 33 if (g_crashCatcherActive) |
| 34 { printf ("caught signal while crash catcher is active!\n"); | 34 { printf ("caught signal while crash catcher is active!\n"); |
| 35 return; | 35 return; |
| 36 } | 36 } |
| 37 | 37 |
| 38 if (g_signalsToCatch.indexOf (sig) != -1) | 38 const pid_t pid = getpid(); |
| 39 { const pid_t pid = getpid(); | 39 QProcess proc; |
| 40 QProcess proc; | 40 QTemporaryFile commandsFile; |
| 41 QTemporaryFile commandsFile; | |
| 42 | 41 |
| 43 g_crashCatcherActive = true; | 42 g_crashCatcherActive = true; |
| 44 printf ("%s: crashed with signal %d, launching gdb\n", __func__, sig); | |
| 45 | 43 |
| 46 if (commandsFile.open()) | 44 if (commandsFile.open()) |
| 47 { commandsFile.write (fmt ("attach %1\n", pid).toLocal8Bit()); | 45 { commandsFile.write (fmt ("attach %1\n", pid).toLocal8Bit()); |
| 48 commandsFile.write (str ("backtrace full\n").toLocal8Bit()); | 46 commandsFile.write (str ("backtrace full\n").toLocal8Bit()); |
| 49 commandsFile.write (str ("detach\n").toLocal8Bit()); | 47 commandsFile.write (str ("detach\n").toLocal8Bit()); |
| 50 commandsFile.write (str ("quit").toLocal8Bit()); | 48 commandsFile.write (str ("quit").toLocal8Bit()); |
| 51 commandsFile.flush(); | 49 commandsFile.flush(); |
| 52 commandsFile.close(); | 50 commandsFile.close(); |
| 53 } | 51 } |
| 54 | 52 |
| 55 QStringList args ({"-x", commandsFile.fileName()}); | 53 QStringList args ({"-x", commandsFile.fileName()}); |
| 56 | 54 |
| 57 proc.start ("gdb", args); | 55 proc.start ("gdb", args); |
| 58 | 56 |
| 59 // Linux doesn't allow ptrace to be used on anything but direct child processes | 57 // Linux doesn't allow ptrace to be used on anything but direct child processes |
| 60 // so we need to use prctl to register an exception to this to allow GDB attach to us. | 58 // so we need to use prctl to register an exception to this to allow GDB attach to us. |
| 61 // We need to do this now and no earlier because only now we actually know GDB's PID. | 59 // We need to do this now and no earlier because only now we actually know GDB's PID. |
| 62 prctl (PR_SET_PTRACER, proc.pid(), 0, 0, 0); | 60 prctl (PR_SET_PTRACER, proc.pid(), 0, 0, 0); |
| 63 | 61 |
| 64 proc.waitForFinished (5000); | 62 proc.waitForFinished (1000); |
| 65 str output = QString (proc.readAllStandardOutput()); | 63 str output = QString (proc.readAllStandardOutput()); |
| 66 str err = QString (proc.readAllStandardError()); | 64 str err = QString (proc.readAllStandardError()); |
| 67 | 65 |
| 68 bombBox (fmt ("<h3>Program crashed with signal %1</h3>\n\n" | 66 bombBox (fmt ("<h3>Program crashed with signal %1</h3>\n\n" |
| 69 "%2" | 67 "%2" |
| 70 "<p><b>GDB <tt>stdout</tt>:</b></p><pre>%3</pre>\n" | 68 "<p><b>GDB <tt>stdout</tt>:</b></p><pre>%3</pre>\n" |
| 71 "<p><b>GDB <tt>stderr</tt>:</b></p><pre>%4</pre>", | 69 "<p><b>GDB <tt>stderr</tt>:</b></p><pre>%4</pre>", |
| 72 sig, (!g_assertionFailure.isEmpty()) ? g_assertionFailure : "", output, err)); | 70 sig, (!g_assertionFailure.isEmpty()) ? g_assertionFailure : "", output, err)); |
| 73 exit (137); | |
| 74 } | |
| 75 } | 71 } |
| 76 | 72 |
| 77 // ============================================================================= | 73 // ============================================================================= |
| 78 // ----------------------------------------------------------------------------- | 74 // ----------------------------------------------------------------------------- |
| 79 void initCrashCatcher() | 75 void initCrashCatcher() |
| 80 { struct sigaction sighandler; | 76 { struct sigaction sighandler; |
| 81 sighandler.sa_handler = &handleSignal; | 77 sighandler.sa_handler = &handleCrash; |
| 82 sighandler.sa_flags = 0; | 78 sighandler.sa_flags = 0; |
| 83 sigemptyset (&sighandler.sa_mask); | 79 sigemptyset (&sighandler.sa_mask); |
| 84 | 80 |
| 85 for (int sig : g_signalsToCatch) | 81 for (int sig : g_signalsToCatch) |
| 86 sigaction (sig, &sighandler, null); | 82 sigaction (sig, &sighandler, null); |
