C signal kill

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <termios.h>

void print0()
{
    printf("a");
}

void print1()
{
    printf("b");
}

int main(void)
{
    struct termios mode;
    tcgetattr(0,&mode);
    mode.c_lflag &= ~ECHO;
    mode.c_lflag &= ~ICANON;
    tcsetattr(0, TCSANOW, &mode);
    setbuf(stdout,NULL);

    pid_t pid = fork();

    if(pid == 0)
    {
        signal(SIGUSR1, print0);
        signal(SIGUSR2, print1);
        //alarm(100);
        while(1)
            pause();
    }
    else
    {
        while(1)
        {
            char c = getchar();
            if(c == '0') kill(pid, SIGUSR1);
            else if(c == '1') kill(pid, SIGUSR2);
        }
    }

    return 0;
}