/*      $OpenBSD: blocked_shutdown.c,v 1.2 2012/02/20 17:06:11 kurt Exp $       */
/*
 * Copyright (c) 2006 Kurt Miller <kurt@intricatesoftware.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Test shutdown() racing with other threads using the same file
 * descriptor, with some of them blocking on data that will never
 * arrive.
 */

#include <pthread.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "test.h"

#define ITERATIONS      100
#define WAITING_THREADS 5

static void *
deadlock_detector(void *arg)
{
        sleep(15);
        PANIC("deadlock detected");
}

static void *
waiting_read(void *arg)
{
        int fd = *(int *)arg;
        struct sockaddr remote_addr;
        char readBuf;
        int n, remote_addr_len = sizeof(struct sockaddr);

        n = recvfrom(fd, &readBuf, 1, 0, &remote_addr, &remote_addr_len);

        if (n == -1)
                return ((caddr_t)NULL + errno);
        else
                return (NULL);
}

int
main(int argc, char *argv[])
{
        pthread_t waiting_threads[WAITING_THREADS];
        pthread_t deadlock_thread;
        struct sockaddr_in addr;
        int fd, i, j;
        void *value_ptr;
        struct timespec rqtp;

        rqtp.tv_sec = 0;
        rqtp.tv_nsec = 1000000;

        bzero((char *) &addr, sizeof addr);
        addr.sin_family = AF_INET;
        addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

        CHECKr(pthread_create(&deadlock_thread, NULL,
            deadlock_detector, NULL));

        for (i = 0; i < ITERATIONS; i++) {
                CHECKe(fd = socket(AF_INET, SOCK_DGRAM, 0));
                addr.sin_port = htons(0);
                CHECKr(bind(fd, (struct sockaddr *)&addr, sizeof(addr)));
                for (j = 0; j < WAITING_THREADS; j++)
                        CHECKr(pthread_create(&waiting_threads[j], NULL,
                            waiting_read, (void *)&fd));
                nanosleep(&rqtp, NULL);
                CHECKr(shutdown(fd, SHUT_RDWR));
                for (j = 0; j < WAITING_THREADS; j++) {
                        CHECKr(pthread_join(waiting_threads[j], &value_ptr));
                        ASSERT(value_ptr == NULL);
                }
                CHECKr(close(fd));
        }       
        SUCCEED;
}