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#include <stdio.h>#include <signal.h>#include <errno.h>void handler(int sig);int main(){    printf("Hello.\n");    if(signal(SIGINT, handler) == SIG_ERR )        printf("Signal error: %s\n", strerror(errno));        while(1)         sleep(1000);     return 0;}void handler(int sig){    printf("Received SIGINT: %d\n", sig);    if(kill(getpid(), SIGKILL) < 0)        printf("SIGKILL error\n");}