fix callPreviousSignalHandler()

Summary:
If a previous handler was found, the code was missing the step of
actually re-raising the handler after restoring the old handler.

Test Plan: Verified that our service actually exits after receiving SIGTERM.

Reviewed By: tudorb@fb.com

FB internal diff: D1096360

diff --git a/folly/experimental/symbolizer/SignalHandler.cpp b/folly/experimental/symbolizer/SignalHandler.cpp
index 5eb014052e8582c6d86b647c9d3bac1c8af866b1..d19cc973ce9823989ad8ddde00cfd6d420e02c77 100644 (file)
--- a/folly/experimental/symbolizer/SignalHandler.cpp
+++ b/folly/experimental/symbolizer/SignalHandler.cpp
@@ -110,6 +110,7 @@ void callPreviousSignalHandler(int signum) {
   for (auto p = kFatalSignals; p->name; ++p) {
     if (p->number == signum) {
       sigaction(signum, &p->oldAction, nullptr);
+      raise(signum);
       return;
     }
   }