commit d000480134b7b00895fbfd142f1d1e18d9cfa6e9
author Mathieu Chartier <mathieuc@google.com> Wed Oct 15 16:59:47 2014 -0700
committer Mathieu Chartier <mathieuc@google.com> Thu Oct 16 19:16:41 2014 -0700
tree a9fab808555310308aecda2a59a7c90727ede0ff
parent d866c7616cb3426c431b635ae69964ce69c2ecb5

Add way to ensure we are at the front of the sigaction chain

Calling this after jni_on_load fixes the unity apps. This is
not exactly correct since we may already have the following chain.

Start up:
Us -> debuggerd

After app goes in front:
App -> us -> debuggerd

After we put ourself back at the front:
Us -> app -> us -> app -> .... stack overflow.

Bug: 17620677
Change-Id: I9183997e3d5ebd51c320b5d51425be5142e938f3

(cherry picked from commit 1f24296c7c8a6501ee2388c0d20b48f471b48660)

sigchainlib/version-script.txt

diff --git a/sigchainlib/version-script.txt b/sigchainlib/version-script.txt
index 8030da4..ce15054 100644
--- a/sigchainlib/version-script.txt
+++ b/sigchainlib/version-script.txt
@@ -4,6 +4,7 @@
   UnclaimSignalChain;
   InvokeUserSignalHandler;
   InitializeSignalChain;
+  EnsureFrontOfChain;
   sigaction;
   signal;
   sigprocmask;