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When a crash signal is delivered do two things: remove all of our

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signal handlers to prevent reentrance on unrelated things (a sigabort
where the handle bus errors) also, clear the signal mask so that the
signal doesn't infinitely reissue.  This fixes rdar://6654827 -
Crash causes clang to loop



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66330 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-03-07 08:15:47 +00:00
parent b9c6c9bfe4
commit 922a881f32
1 changed files with 14 additions and 5 deletions
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19
lib/System/Unix/Signals.inc
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@ -55,13 +55,23 @@ static const int KillSigs[] = {
static const int *const KillSigsEnd =
KillSigs + sizeof(KillSigs) / sizeof(KillSigs[0]);
// SignalHandler - The signal handler that runs...
static void UnregisterHandler(int Signal) {
signal(Signal, SIG_DFL);
}
// SignalHandler - The signal handler that runs.
static RETSIGTYPE SignalHandler(int Sig) {
// Restore the signal behavior to default, so that the program actually
// crashes when we return and the signal reissues. This also ensures that if
// we crash in our signal handler that the program will terminate immediately
// instead of recursing in the signal handler.
signal(Sig, SIG_DFL);
std::for_each(KillSigs, KillSigsEnd, UnregisterHandler);
// Unmask all potentially blocked kill signals.
sigset_t SigMask;
sigfillset(&SigMask);
sigprocmask(SIG_UNBLOCK, &SigMask, 0);
if (FilesToRemove != 0)
while (!FilesToRemove->empty()) {
@ -86,12 +96,11 @@ static RETSIGTYPE SignalHandler(int Sig) {
}
// Just call signal
static void RegisterHandler(int Signal) {
signal(Signal, SignalHandler);
static void RegisterHandler(int Signal) {
signal(Signal, SignalHandler);
}
void sys::SetInterruptFunction(void (*IF)()) {
InterruptFunction = IF;
RegisterHandler(SIGINT);