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QtTest: block almost all Unix signals in the WatchDog thread

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Signals delivered via kill(2) are delivered to any thread that is
running, so let's make sure the WatchDog thread doesn't get them.

This may be hiding bugs in the user's handler code, but in simple unit
tests the user may not be expecting there to be multiple threads in the
first place.

Change-Id: I512648fd617741199e67fffd17822cdcdf30926c
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit da0571d87890b587154a6d9124ac29dc30b151dd)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Thiago Macieira 2023-09-05 19:02:16 -07:00 committed by Qt Cherry-pick Bot
parent aa606f9760
commit 922f60c140
1 changed files with 28 additions and 4 deletions
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32
src/testlib/qtestcase.cpp
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@ -217,6 +217,8 @@ static std::string asyncSafeToString(int n)
#endif // defined(Q_OS_UNIX)
} // unnamed namespace
[[maybe_unused]] static void blockUnixSignals();
static bool alreadyDebugging()
{
#if defined(Q_OS_LINUX)
@ -1287,6 +1289,7 @@ public:
void run() override
{
blockUnixSignals();
auto locker = qt_unique_lock(mutex);
expecting.store(TestFunctionStart, std::memory_order_release);
waitCondition.notify_all();
@ -1783,9 +1786,8 @@ bool reportResult(bool success, qxp::function_ref<const char *()> lhs,
} // namespace QTest
namespace {
#if defined(Q_OS_WIN)
namespace {
// Helper class for resolving symbol names by dynamically loading "dbghelp.dll".
class DebugSymbolResolver
{
@ -1939,9 +1941,17 @@ private:
return EXCEPTION_EXECUTE_HANDLER;
}
};
} // unnamed namespace
using FatalSignalHandler = WindowsFaultHandler;
inline void blockUnixSignals()
{
// Windows does have C signals, but doesn't use them for the purposes we're
// talking about here
}
#elif defined(Q_OS_UNIX) && !defined(Q_OS_WASM)
namespace {
class FatalSignalHandler
{
public:
@ -2192,12 +2202,26 @@ private:
static bool pauseOnCrash;
};
bool FatalSignalHandler::pauseOnCrash = false;
} // unnamed namespace
inline void blockUnixSignals()
{
// Block most Unix signals so the WatchDog thread won't be called when
// external signals are delivered, thus avoiding interfering with the test
sigset_t set;
sigfillset(&set);
// we allow the crashing signals, in case we have bugs
for (int signo : FatalSignalHandler::fatalSignals)
sigdelset(&set, signo);
pthread_sigmask(SIG_BLOCK, &set, nullptr);
}
#else // Q_OS_WASM or weird systems
class FatalSignalHandler {};
inline void blockUnixSignals() {}
#endif // Q_OS_* choice
} // unnamed namespace
static void initEnvironment()
{
qputenv("QT_QTESTLIB_RUNNING", "1");