original is struct sigcontext *sc;

after changing to struct mcontext_t, error occur. How to fix it?

error: ‘struct mcontext_t’ has no member named ‘eip’

#include <stdio.h>
#include <signal.h>
#include <asm/ucontext.h>

static unsigned long target;

void handler(int signum, siginfo_t *siginfo, void *uc0){
    struct ucontext *uc;
    mcontext_t *sc;

    uc = (struct ucontext *)uc0;
    sc = &uc->uc_mcontext;

    sc->eip = target;
}