signal 函数的使用

#include <stdio.h>
#include <signal.h>
#include <unistd.h>

void sigroutine(int dunno) {
switch (dunno) {
case 1:
        printf("Get a signal -- SIGHUP /n");
        break;
case 2:
        printf("Get a signal -- SIGINT /n");
        break;
case 3:
        printf("Get a signal -- SIGQUIT /n");
        break;
}
        return;
}

int main() {
        printf("process id is %d /n",2);
        signal(SIGHUP, sigroutine);
        signal(SIGINT, sigroutine);
        signal(SIGQUIT, sigroutine);
        for (;;)
                ;
        return 1;
}