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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "crashhandlersetup.h"
#include <QtGlobal>
#if !defined(QT_NO_DEBUG) && defined(Q_OS_LINUX)
#define BUILD_CRASH_HANDLER
#endif
#ifdef BUILD_CRASH_HANDLER
#include <QApplication>
#include <QFileInfo>
#include <QString>
#include <stdlib.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/prctl.h>
// Enable compilation with older header that doesn't contain this constant
// for running on newer libraries that do support it
#ifndef PR_SET_PTRACER
#define PR_SET_PTRACER 0x59616d61
#endif
#ifdef Q_WS_X11
#include <qx11info_x11.h>
#include <X11/Xlib.h>
#endif
static const char *appNameC = nullptr;
static const char *disableRestartOptionC = nullptr;
static const char *crashHandlerPathC = nullptr;
static void *signalHandlerStack = nullptr;
extern "C" void signalHandler(int signal)
{
#ifdef Q_WS_X11
// Kill window since it's frozen anyway.
if (QX11Info::display())
close(ConnectionNumber(QX11Info::display()));
#endif
pid_t pid = fork();
switch (pid) {
case -1: // error
break;
case 0: // child
if (disableRestartOptionC) {
execl(crashHandlerPathC, crashHandlerPathC, strsignal(signal), appNameC,
disableRestartOptionC, (char *) 0);
} else {
execl(crashHandlerPathC, crashHandlerPathC, strsignal(signal), appNameC, (char *) 0);
}
_exit(EXIT_FAILURE);
default: // parent
prctl(PR_SET_PTRACER, pid, 0, 0, 0);
waitpid(pid, 0, 0);
_exit(EXIT_FAILURE);
break;
}
}
#endif // BUILD_CRASH_HANDLER
CrashHandlerSetup::CrashHandlerSetup(const QString &appName,
RestartCapability restartCap,
const QString &executableDirPath)
{
#ifdef BUILD_CRASH_HANDLER
const QString value = qEnvironmentVariable("QTC_USE_CRASH_HANDLER");
if (value.trimmed().isEmpty())
return;
if (!QStringList{"1", "all", "yes"}.contains(value)) {
const QString binaryName = QFileInfo(QCoreApplication::applicationFilePath()).fileName();
if (!value.split(",", Qt::SkipEmptyParts).contains(binaryName))
return;
}
appNameC = qstrdup(qPrintable(appName));
if (restartCap == DisableRestart)
disableRestartOptionC = "--disable-restart";
const QString execDirPath = executableDirPath.isEmpty()
? QCoreApplication::applicationDirPath()
: executableDirPath;
const QString crashHandlerPath = execDirPath + QLatin1String("/qtcreator_crash_handler");
crashHandlerPathC = qstrdup(qPrintable(crashHandlerPath));
// Setup an alternative stack for the signal handler. This way we are able to handle SIGSEGV
// even if the normal process stack is exhausted.
stack_t ss;
ss.ss_sp = signalHandlerStack = malloc(SIGSTKSZ); // Usual requirements for alternative signal stack.
if (ss.ss_sp == 0) {
qWarning("Warning: Could not allocate space for alternative signal stack (%s).", Q_FUNC_INFO);
return;
}
ss.ss_size = SIGSTKSZ;
ss.ss_flags = 0;
if (sigaltstack(&ss, 0) == -1) {
qWarning("Warning: Failed to set alternative signal stack (%s).", Q_FUNC_INFO);
return;
}
// Install signal handler for calling the crash handler.
struct sigaction sa;
if (sigemptyset(&sa.sa_mask) == -1) {
qWarning("Warning: Failed to empty signal set (%s).", Q_FUNC_INFO);
return;
}
sa.sa_handler = &signalHandler;
// SA_RESETHAND - Restore signal action to default after signal handler has been called.
// SA_NODEFER - Don't block the signal after it was triggered (otherwise blocked signals get
// inherited via fork() and execve()). Without this the signal will not be delivered to the
// restarted Qt Creator.
// SA_ONSTACK - Use alternative stack.
sa.sa_flags = SA_RESETHAND | SA_NODEFER | SA_ONSTACK;
// See "man 7 signal" for an overview of signals.
// Do not add SIGPIPE here, QProcess and QTcpSocket use it.
const int signalsToHandle[] = {SIGILL, SIGABRT, SIGFPE, SIGSEGV, SIGBUS, 0};
for (int i = 0; signalsToHandle[i]; ++i) {
if (sigaction(signalsToHandle[i], &sa, 0) == -1 ) {
qWarning("Warning: Failed to install signal handler for signal \"%s\" (%s).",
strsignal(signalsToHandle[i]), Q_FUNC_INFO);
}
}
#else
Q_UNUSED(appName)
Q_UNUSED(restartCap)
Q_UNUSED(executableDirPath)
#endif // BUILD_CRASH_HANDLER
}
CrashHandlerSetup::~CrashHandlerSetup()
{
#ifdef BUILD_CRASH_HANDLER
delete[] crashHandlerPathC;
delete[] appNameC;
free(signalHandlerStack);
#endif
}
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