am c59b2482: am 5a6f593b: Merge "Use sigemptyset to initialise sigset_t values. sigset_t may not be implemented as an integral type."

* commit 'c59b248241b18492d20e112230a907c14400275b':
  Use sigemptyset to initialise sigset_t values. sigset_t may not be implemented as an integral type.