/* $OpenBSD: closefrom.c,v 1.1 2004/01/15 22:22:52 marc Exp $ */

/* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */

#include <errno.h>
#include <pthread.h>
#include <unistd.h>

#include "test.h"

static void *
dummy_thread(void* arg)
{
        /* just exit */
        return NULL;
}

/*
 * Test that closefrom does the right thing in a threaded programs,
 * specifically that it doesn't kill the thread kernel signal pipe.
 */
int
main(int argc, char *argv[])
{
        pthread_t thread;
        void *status;
        int fd;
        int result;

        /* close files above stderr.   The kernel pipes shouldn't be touched */
        fd = STDERR_FILENO + 1;
        result = closefrom(fd);
        printf("closefrom(%d) == %d/%d\n", fd, result, errno);

        /* do it again: make sure that the result is -1/EBADF */
        result = closefrom(fd);
        printf("closefrom(%d) == %d/%d\n", fd, result, errno);
        ASSERT(result == -1 && errno == EBADF);

        /* start a thread to verify the thread kernel is working */
        CHECKr(pthread_create(&thread, NULL, dummy_thread, NULL));
        CHECKr(pthread_join(thread, &status));
        printf("dummy thread exited with status %p\n", status);

        SUCCEED;
        return 0;
}