Function setSignalHandler

oneflow/api/python/utils/dataloader.cpp:58–68

signal(2) is really not portable. So use sigaction. http://man7.org/linux/man-pages/man2/signal.2.html

// signal(2) is really not portable. So use sigaction.
// http://man7.org/linux/man-pages/man2/signal.2.html
static inline void setSignalHandler(int signal, void (*handler)(int, siginfo_t*, void*),
                                    struct sigaction* old_sa_ptr) {
  struct sigaction sa {};
  sa.sa_sigaction = handler;
  sa.sa_flags = SA_RESTART | SA_SIGINFO | SA_NOCLDSTOP | SA_NODEFER;
  if (sigemptyset(&sa.sa_mask) != 0 || sigaction(signal, &sa, old_sa_ptr) != 0) {
    std::ostringstream oss;
    oss << "An error occurred while setting handler for " << strsignal(signal) << ".";
    throw std::runtime_error(oss.str());
  }
}

SIGNAL_HANDLER(SIGBUS, handler_SIGBUS,
               "ERROR: Unexpected bus error encountered in worker. "