se_signal_f
static se_signal_f *sig_handlers[NSIG];
se_signal_sethandler(int sig, se_signal_f *handler, void *data)
#define SE_SIG_DFL (se_signal_f *)0
#define SE_SIG_IGN (se_signal_f *)1
extern int se_signal_sethandler(int, se_signal_f *, void *);
extern se_signal_f *se_signal_gethandler(int, void **);