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#!/usr/bin/perl

...
while(sleep(1)) {

}

$ perl test.pl 
My pid is: 3188
...
$ kill -SIGUSR1 3188
got signal.
---> script is terminated

#include <stdio.h>
#include <stdlib.h>
...
void usr1handler(int signal) {
    printf("Got a signal: %d\n", signal);
}

$ ./test 
My pid is: 3188
...
$ kill -SIGUSR1 3318
Got a signal called: 10
... it never exits