fifo.c

uint32_t working_thread = 0; 
working_thread = htonl(check_working(global_server->pool)); //get working thread num
fd = open(global_server->arg.fifofile, O_WRONLY | O_NONBLOCK);
if (fd == -1) {
  fprintf(stderr, "open fifo file fail\n");
  return;
}
write(fd, &working_thread, sizeof(uint32_t));
close(fd);