25void block_default_signals(sigset_t *signal_set, sigset_t *old_set);
30void unblock_default_signals(sigset_t *signal_set, sigset_t *old_set);
32void *wait_for_signals(sigset_t *signal_set);
33void start_wait_for_signals(sigset_t *signal_set);
39typedef void (*sighandler_t)(int);
40void set_signal_handler(sighandler_t func);
41void set_signal_handler(
int sig, sighandler_t func);