main_sig_handler
void main_sig_handler(int, short, void *);
signal_set(&ev_sigint, SIGINT, main_sig_handler, &env);
signal_set(&ev_sigterm, SIGTERM, main_sig_handler, &env);
signal_set(&ev_sighup, SIGHUP, main_sig_handler, &env);
signal_set(&ev_sigchld, SIGCHLD, main_sig_handler, &env);