move some code to gracefully handle the case when a handler crashes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66171 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/System/Unix/Signals.inc b/lib/System/Unix/Signals.inc
index ac0d982f4e5b87824d7fe84742c0650b2381c13c..f409cefcc3536b75b688e355da90da9b45467909 100644 (file)
--- a/lib/System/Unix/Signals.inc
+++ b/lib/System/Unix/Signals.inc
@@ -57,6 +57,12 @@ static const int *const KillSigsEnd =
 
 // 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);
+
   if (FilesToRemove != 0)
     while (!FilesToRemove->empty()) {
       FilesToRemove->back().eraseFromDisk(true);
@@ -77,10 +83,6 @@ static RETSIGTYPE SignalHandler(int Sig) {
   if (CallBacksToRun)
     for (unsigned i = 0, e = CallBacksToRun->size(); i != e; ++i)
       (*CallBacksToRun)[i].first((*CallBacksToRun)[i].second);
-    
-  // Restore the signal behavior to default, so that the program actually
-  // crashes when we return and the signal reissues.
-  signal(Sig, SIG_DFL);
 }
 
 // Just call signal