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When we restore signal handlers, restore them back to what they

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were when we came around, not to their default handler.  This 
should fix PR3848


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67509 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-03-23 05:55:36 +00:00
parent 1c4d8a00ab
commit eab5cb3b55
1 changed files with 30 additions and 8 deletions
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38
lib/System/Unix/Signals.inc
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@ -57,23 +57,45 @@ static const int KillSigs[] = {
static const int *const KillSigsEnd =
KillSigs + sizeof(KillSigs) / sizeof(KillSigs[0]);
// Just call signal
static unsigned NumRegisteredSignals = 0;
static struct {
struct sigaction SA;
int SigNo;
} RegisteredSignalInfo[(sizeof(IntSigs)+sizeof(KillSigs))/sizeof(KillSigs[0])];
static void RegisterHandler(int Signal) {
signal(Signal, SignalHandler);
assert(NumRegisteredSignals <
sizeof(RegisteredSignalInfo)/sizeof(RegisteredSignalInfo[0]) &&
"Out of space for signal handlers!");
struct sigaction NewHandler;
NewHandler.sa_handler = SignalHandler;
NewHandler.sa_flags = SA_NODEFER|SA_RESETHAND;
sigemptyset(&NewHandler.sa_mask);
// Install the new handler, save the old one in RegisteredSignalInfo.
sigaction(Signal, &NewHandler,
&RegisteredSignalInfo[NumRegisteredSignals].SA);
RegisteredSignalInfo[NumRegisteredSignals].SigNo = Signal;
++NumRegisteredSignals;
}
static void RegisterHandlers() {
// If the handlers are already registered, we're done.
if (NumRegisteredSignals != 0) return;
std::for_each(IntSigs, IntSigsEnd, RegisterHandler);
std::for_each(KillSigs, KillSigsEnd, RegisterHandler);
}
static void UnregisterHandler(int Signal) {
signal(Signal, SIG_DFL);
}
static void UnregisterHandlers() {
std::for_each(KillSigs, KillSigsEnd, UnregisterHandler);
std::for_each(IntSigs, IntSigsEnd, UnregisterHandler);
// Restore all of the signal handlers to how they were before we showed up.
for (unsigned i = 0, e = NumRegisteredSignals; i != e; ++i)
sigaction(RegisteredSignalInfo[NumRegisteredSignals].SigNo,
&RegisteredSignalInfo[NumRegisteredSignals].SA, 0);
NumRegisteredSignals = 0;
}