ignoresig
(void)ignoresig(SIGINT, &oact, &oset);
(void)ignoresig(SIGINT, &oact, &oset);
(void)ignoresig(SIGINT, &oact, &oset);
(void)ignoresig(SIGINT, &oact, &oset);
(void)ignoresig(SIGINT, &oact, &oset);
int ignoresig(int, struct sigaction *, sigset_t *);
(void)ignoresig(SIGHUP, NULL, NULL);
(void)ignoresig(SIGINT, NULL, NULL);
(void)ignoresig(SIGQUIT, NULL, NULL);