[PATCH] D22063: [esan|wset] Ensure SIGSEGV is not blocked

[Derek Bruening via llvm-commits]

bruening created this revision.
bruening added a reviewer: aizatsky.
bruening added subscribers: llvm-commits, eugenis, kcc, zhaoqin, vitalybuka.
Herald added a subscriber: kubabrecka.

Adds interception of sigprocmask and pthread_sigmask to esan so that the
working set tool can prevent SIGSEGV from being blocked.  A blocked SIGSEGV
results in crashes due to our lazy shadow page allocation scheme.

Adds new sanitizer helper functions internal_sigemptyset and
internal_sigismember.

Adds a test to workingset-signal-posix.cpp.

http://reviews.llvm.org/D22063

Files:
  lib/esan/esan.cpp
  lib/esan/esan.h
  lib/esan/esan_interceptors.cpp
  lib/esan/working_set.h
  lib/esan/working_set_posix.cpp
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_posix.h
  test/esan/TestCases/workingset-signal-posix.cpp

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