c – 带有sighup的信号处理程序

#include <stdio.h>
#include <stdlib.h>
#include <sys/signal.h>
#include <string.h>

void handler (int sig);
int count;

int main() {

    struct sigaction act;
    memset (&act,sizeof (act));


    act.sa_handler = handler;
    if (sigaction (SIGHUP,&act,NULL) < 0) {
        perror ("sigaction");
        exit (-1);
    }

    int count = 0;
    while(1) {
        sleep(1);
        count++;
    }

}

void handler (int signal_number){
        printf ("count is %dn",count);
}

我假设我这样做是正确的,我将如何在命令行中调用sighup？它需要调用sighup来打印我的计数.