tree 1a3bfd73bbf3a509df7bb8e38341b48bbb7c20ed
parent 9c53671bb659cb47bea82f6cbdd46c0843753e82
author jgu21 <jinghui.gu@intel.com> 1442908063 -0400
committer jgu21 <jinghui.gu@intel.com> 1445223328 -0400

Block signals before invoking special or user handlers

1. Block signals marked in sa_mask before invoking user handler
   if not in old style.
2. Block all signals before invoking special signal handler.

Change-Id: Ie1283e97ed28ee3421df584352cd62cb107264bc
Signed-off-by: jgu21 <jinghui.gu@intel.com>