sigcontext
struct sigcontext sc;
struct sigcontext sc;
void (*sv_handler)(int, int, struct sigcontext *, char *);
struct sigcontext sc;
extern void (*_siguhandler[])(int, int, struct sigcontext *, char *);
struct sigcontext sc;
__sigcleanup(struct sigcontext *scp)
void (*ohandler)(int, int, struct sigcontext *, char *);
void (*nhandler)(int, int, struct sigcontext *, char *);
(void (*) (int, int, struct sigcontext *, char *))
(void (*) (int, int, struct sigcontext *, char *))(uintptr_t)a;