i have checked asm/ucontext.h

it should be sigcontext, but why pop up the error message cannot convert ‘mcontext_t*’ to ‘sigcontext*’ in assignment

#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;
    struct sigcontext *sc;

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

    sc->eip = target;
}



struct ucontext {
    unsigned long     uc_flags;
    struct ucontext  *uc_link;
    stack_t       uc_stack;
    struct sigcontext uc_mcontext;
    sigset_t      uc_sigmask;   /* mask last for extensibility */
};