/*      $OpenBSD: signal.c,v 1.5 2003/07/31 21:48:06 deraadt Exp $      */
/* David Leonard <d@openbsd.org>, 2001. Public Domain. */

/*
 * This program tests signal handler re-entrancy.
 */

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include "test.h"

volatile int alarmed;

static void *
sleeper(void *arg)
{
        sigset_t mask;

        /* Ignore all signals in this thread */
        sigfillset(&mask);
        CHECKe(sigprocmask(SIG_SETMASK, &mask, NULL));
        ASSERT(sleep(3) == 0);
        CHECKe(write(STDOUT_FILENO, "\n", 1));
        SUCCEED;
}

static void
handler(int sig)
{
        int save_errno = errno;

        alarmed = 1;
        alarm(1);
        signal(SIGALRM, handler);
        errno = save_errno;
}

int
main(int argc, char *argv[])
{
        pthread_t slpr;

        ASSERT(signal(SIGALRM, handler) != SIG_ERR);
        CHECKe(alarm(1));
        CHECKr(pthread_create(&slpr, NULL, sleeper, NULL));
        /* ASSERT(sleep(1) == 0); */
        for (;;) {
                if (alarmed) {
                        alarmed = 0;
                        CHECKe(write(STDOUT_FILENO, "!", 1));
                }
        }
}