/*      $OpenBSD: close.c,v 1.7 2012/02/26 21:43:25 fgsch Exp $ */
/*
 * Copyright (c) 1993, 1994, 1995, 1996 by Chris Provenzano and contributors, 
 * proven@mit.edu All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Chris Provenzano,
 *      the University of California, Berkeley, and contributors.
 * 4. Neither the name of Chris Provenzano, the University, nor the names of
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL CHRIS PROVENZANO, THE REGENTS OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

/*
 * Test the semantics of close() while a select() is happening.
 * Not a great test.
 */

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

#define BUFSIZE 4096

int fd;

/*
 * meat of inetd discard service -- ignore data
 */
static void
discard(int s)
{
        char buffer[BUFSIZE];

        while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) ||
            errno == EINTR)
                ;
}

/*
 * Listen on localhost:TEST_PORT for a connection
 */
#define TEST_PORT       9876

static void
server(void)
{
        int     sock;
        int     client;
        int     client_addr_len;
        struct sockaddr_in      serv_addr;
        struct sockaddr         client_addr;

        CHECKe(sock = socket(AF_INET, SOCK_STREAM, 0));
        bzero((char *) &serv_addr, sizeof serv_addr);
        serv_addr.sin_family = AF_INET;
        serv_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        serv_addr.sin_port = htons(TEST_PORT);
        CHECKe(bind(sock, (struct sockaddr *) &serv_addr, sizeof serv_addr));
        CHECKe(listen(sock,3));

        client_addr_len = sizeof client_addr;
        CHECKe(client = accept(sock, &client_addr, &client_addr_len ));
        CHECKe(close(sock));
        discard(client);
        CHECKe(close(client));
        exit(0);
}

static void *
new_thread(void* arg)
{
        fd_set r;
        int ret;
        char garbage[] = "blah blah blah";

        FD_ZERO(&r);
        FD_SET(fd, &r);

        printf("child: writing some garbage to fd %d\n", fd);
        CHECKe(write(fd, garbage, sizeof garbage));
        printf("child: calling select() with fd %d\n", fd);
        ASSERT((ret = select(fd + 1, &r, NULL, NULL, NULL)) == -1);
        ASSERT(errno == EBADF);
        printf("child: select() returned %d, errno %d = %s [correct]\n", ret,
               errno, strerror(errno));
        return NULL;
}

int
main(int argc, char *argv[])
{
        pthread_t thread;
        pthread_attr_t attr;
        struct sockaddr_in addr;
        int ret;

        /* fork and have the child open a listener */
        signal(SIGCHLD, SIG_IGN);
        switch (fork()) {
        case 0:
                server();
                exit(0);
        case -1:
                exit(errno);
        default:
                sleep(2);
        }

        /* Open up a TCP connection to the local discard port */
        addr.sin_family = AF_INET;
        addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        addr.sin_port = htons(TEST_PORT);

        CHECKe(fd = socket(AF_INET, SOCK_STREAM, 0));
        printf("main: connecting to test port with fd %d\n", fd);
        ret = connect(fd, (struct sockaddr *)&addr, sizeof addr);
        if (ret == -1)
                fprintf(stderr, "connect() failed\n");
        CHECKe(ret);
        printf("main: connected on fd %d\n", fd);

        CHECKr(pthread_attr_init(&attr));
        CHECKr(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED));
        printf("starting child thread\n");
        CHECKr(pthread_create(&thread, &attr, new_thread, NULL));
        sleep(1);
        printf("main: closing fd %d\n", fd);
        CHECKe(close(fd));
        printf("main: closed\n");
        sleep(1);
        SUCCEED;
}