Class sigaction

be/src/kudu/util/debug-util.cc:297–297

  // change our signal, unregister the old one.
  if (signum != g_stack_trace_signum && state == INITIALIZED) {
    struct sigaction old_act;
    PCHECK(sigaction(g_stack_trace_signum, nullptr, &old_act) == 0);
    if (old_act.sa_sigaction == &HandleStackTraceSignal) {
      signal(g_stack_trace_signum, SIG_DFL);