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MySQL 信号处理函数

mysqld.cc
void my_init_signals(void)
{
  sigset_t set;
  struct sigaction sa;
  DBUG_ENTER("my_init_signals");

  my_sigset(THR_SERVER_ALARM,print_signal_warning); // Should never be called!

  if (!(test_flags & TEST_NO_STACKTRACE) || (test_flags & TEST_CORE_ON_SIGNAL))
  {
    sa.sa_flags = SA_RESETHAND | SA_NODEFER;
    sigemptyset(&sa.sa_mask);
    sigprocmask(SIG_SETMASK,&sa.sa_mask,NULL);

#ifdef HAVE_STACKTRACE
    my_init_stacktrace();
#endif
#if defined(__amiga__)
    sa.sa_handler=(void(*)())handle_fatal_signal;
#else
    sa.sa_handler=handle_fatal_signal;
#endif
    sigaction(SIGSEGV, &sa, NULL);
    sigaction(SIGABRT, &sa, NULL);
#ifdef SIGBUS
    sigaction(SIGBUS, &sa, NULL);
#endif
    sigaction(SIGILL, &sa, NULL);
    sigaction(SIGFPE, &sa, NULL);
  }
  }
void my_write_core(int sig)
{
  signal(sig, SIG_DFL);
  pthread_kill(pthread_self(), sig);
#if defined(P_MYID) && !defined(SCO)
  /* On Solaris, the above kill is not enough */
  sigsend(P_PID,P_MYID,sig);
#endif
}