/* ====================================================================
 * Copyright (c) 2000 The Apache Software Foundation.  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 acknowledgment:
 *    "This product includes software developed by the Apache Software Foundation
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * 4. The names "Apache Server" and "Apache Software Foundation" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Software Foundation.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the Apache Software Foundation
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * THIS SOFTWARE IS PROVIDED BY THE Apache Software Foundation ``AS IS'' AND ANY
 * EXPRESSED 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 THE Apache Software Foundation OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.
 * For more information on the Apache Software Foundation and the Apache HTTP server
 * project, please see <http://www.apache.org/>.
 *
 */
#include "apr_shmem.h"
#include "apr_lock.h"
#include "apr_errno.h"
#include "apr_general.h"
#include "apr_lib.h"
#include "errno.h"
#include <stdio.h>
#include <stdlib.h>
#include <process.h>
#ifdef BEOS
#include <unistd.h>
#endif

typedef struct mbox {
    char msg[1024]; 
    int msgavail; 
} mbox;
ap_context_t *context;
mbox *boxes;

void msgwait(int boxnum)
{
    volatile int test = 0;
    while (test == 0) {
        sleep(0);
        test = boxes[boxnum].msgavail;
    }    
    fprintf(stdout, "\nreceived a message in box %d, message was: %s\n", 
            boxnum, boxes[boxnum].msg); 
}

void msgput(int boxnum, char *msg)
{
    fprintf(stdout, "Sending message to box %d\n", boxnum);
    ap_cpystrn(boxes[boxnum].msg, msg, strlen(msg));
    boxes[boxnum].msgavail = 1;
}

int main()
{
    ap_shmem_t *shm;
    pid_t pid;
    int size;

    ap_initialize();

    fprintf(stdout, "Initializing the context......."); 
    if (ap_create_context(&context, NULL) != APR_SUCCESS) {
        fprintf(stderr, "could not initialize\n");
        exit(-1);
    }
    fprintf(stdout, "OK\n");

    fprintf(stdout, "Creating shared memory block......."); 
    if (ap_shm_init(&shm, 1048576, NULL, context) != APR_SUCCESS) { 
        fprintf(stderr, "Error allocating shared memory block\n");
        exit(-1);
    }
    fprintf(stdout, "OK\n");

    fprintf(stdout, "Allocating shared memory......."); 
    size = sizeof(mbox) * 2;
    boxes = ap_shm_calloc(shm, size);
    if (boxes == NULL) { 
        fprintf(stderr, "Error creating message boxes.\n");
        exit(-1);
    }
    fprintf(stdout, "OK\n");

    fprintf(stdout, "Creating a child process\n");
    pid = fork();
    if (pid == 0) {
sleep(1);
        if (ap_open_shmem(shm) == APR_SUCCESS) {
            msgwait(1);
            msgput(0, "Msg received\n");
        } else {
            puts( "Child: unable to get access to shared memory" );
        }
        exit(1);
    }
    else if (pid > 0) {
        msgput(1, "Sending a message\n");
sleep(1);
        msgwait(0);
        exit(1);
    }
    else {
        fprintf(stderr, "Error creating a child process\n");
        exit(1);
    }
}