Thread: My signal problem

Code:

#include<signal.h>
#include<unistd.h>
#include<stdio.h>
#include<termios.h>
#include<unistd.h>
#include<setjmp.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<string.h>
#include<sys/times.h>

jmp_buf tml,tm2;
static void sig_int(int signo);
int main (void)
{
//signal(SIGINT,sig_int);
        struct termios term, old_term;
        char c;
        char name[50];
        pid_t pid;
        struct tms start,end;
        clock_t c_st,c_ed;
        int jj=0;
        static long clktck=0;
        if(clktck==0)
        if((clktck=sysconf(_SC_CLK_TCK))<0)
        printf("sysconf error\n");
//signal(SIGINT,sig_int);
        if((c_st=times(&start))==-1)printf("times start error\n");
        pid=vfork();
        signal(SIGINT,sig_int);
        if(pid==0)
        {
signal(SIGINT,sig_int);
        tcgetattr(STDIN_FILENO, &term);
        old_term=term;
        term.c_lflag &=~ICANON;
        term.c_cc[VMIN]=1;
        term.c_cc[VTIME]=0;
        term.c_cc[VINTR]=5;

        tcsetattr(STDIN_FILENO,TCSANOW,&term);

        setjmp(tml);
        printf("command # ");
        signal(SIGINT,sig_int);
        int ii=alarm(6);
        printf("remain alarm %d\n",ii);
gets(name);c=' ';
        if(strcmp(name,"exit")!=0)
        {
        jj++;
        if(system(name)==-1)
        printf("command error\n");
        longjmp(tml,1);
        }
        setjmp(tm2);
        printf("Do you really want to exit?(y/n)\n");
        while((c&=255)!='y' && (c&=255)!='n')
        {
        read(STDIN_FILENO,&c,1);
        if(c=='y')
        {jj++;
        exit(0);
        }
        if(c=='n')longjmp(tml,1);


        }
        tcsetattr(STDIN_FILENO,TCSANOW,&old_term);
 }
        else
        {

        wait(NULL);

        printf("world");
         if((c_ed=times(&end))==-1)printf("times end error\n");

        printf("real : %7.2f\n", (c_ed-c_st)/(double)clktck);
        printf("user:  %7.2f\n", end.tms_utime-start.tms_utime);
        printf("Finish parent\n");
        printf("total commands %d\n",jj);
        }

}
static void sig_int(int signo)
{
        printf("hello");
        longjmp(tm2,1);


}

In that program, I want to do whenever I press Ctrl+E, I want that program to print hello and ask do you really want to exit? But when I run that program and press Ctrl+E it exit instantaneously. I try to change the position of

Code:

signal ( SIGINT, sig_int);

to so many places : before fork, after fork, etc..
But still don't work.
Anyone could help me?
Thanks