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

void
handler(int signo)
{
    printf("\nsigno=%d\n", signo);
}

int
main(void)
{
    int r;

    if (signal(SIGUSR2, handler) == SIG_ERR)
        err(EXIT_FAILURE, "signal");

    if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
        err(EXIT_FAILURE, "signal2");

    printf("[PID %ld]\n", (long) getpid());
    printf("Sleeping 10 seconds\n");
    r = sleep(10);
    printf("r=%d\n", r);

    exit(EXIT_SUCCESS);
}