tree d319a9fb331c47a467b2c922ac9e856d4c705980
parent 4a25727eba333c19dc6eacc35950c526c11041d4
author Josh Gao <jmgao@google.com> 1536096803 -0700
committer Josh Gao <jmgao@google.com> 1536101699 -0700

sigchain: fix EnsureFrontOfChain on 32-bit.

On 32-bit, bionic's sigaction forwards to sigaction64, which gets
interposed by libsigchain's sigaction64, which returns the user's
signal handler, not the actual one. This leads to EnsureFrontOfChain's
check for whether it should reregister the signal handler to falsely
return true, which leads to explosions.

Bug: http://b/112677822
Test: /data/nativetest/art/arm/art_sigchain_tests/sigchain_test
Test: /data/nativetest64/art/arm64/art_sigchain_tests/sigchain_test
Change-Id: Ifbaa4448580d763f5ffd575fa2e77113a8108de6