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

static void
atexitFunc1(void)
{
    printf("atexit function 1 called\n");
}

static void
atexitFunc2(void)
{
    printf("atexit function 2 called\n");
}

static void
onexitFunc(int exitStatus, void *arg)
{
    printf("on_exit function called: status=%d, arg=%ld\n",
            exitStatus, (long) arg);
}

int
main(int argc, char *argv[])
{
    if (on_exit(onexitFunc, (void *) 10) != 0)
        errx(EXIT_FAILURE, "on_exit 1");

    if (atexit(atexitFunc1) != 0)
        errx(EXIT_FAILURE, "atexit 1");

    if (atexit(atexitFunc2) != 0)
        errx(EXIT_FAILURE, "atexit 2");

    if (on_exit(onexitFunc, (void *) 20) != 0)      // #TIP
        errx(EXIT_FAILURE, "on_exit 2");

    exit(2);
}