/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * 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. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" 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 name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``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, please see
 * <http://www.apache.org/>.
 */

#include "networkio.h"

static ap_status_t wait_for_io_or_timeout(ap_socket_t *sock, int for_read)
{
    struct timeval tv, *tvptr;
    fd_set fdset;
    int srv;

    do {
        FD_ZERO(&fdset);
        FD_SET(sock->socketdes, &fdset);
        if (sock->timeout < 0) {
            tvptr = NULL;
        }
        else {
            tv.tv_sec = sock->timeout / AP_USEC_PER_SEC;
            tv.tv_usec = sock->timeout % AP_USEC_PER_SEC;
            tvptr = &tv;
        }
        srv = select(sock->socketdes + 1,
            for_read ? &fdset : NULL,
            for_read ? NULL : &fdset, 
            NULL,
            tvptr);
            /* TODO - timeout should be smaller on repeats of this loop */
    } while (srv == -1 && errno == EINTR);

    if (srv == 0) {
        return APR_TIMEUP;
    }
    else if (srv < 0) {
        return errno;
    }
    return APR_SUCCESS;
}

ap_status_t ap_send(ap_socket_t *sock, const char *buf, ap_ssize_t *len)
{
    ssize_t rv;
	
    do {
        rv = send(sock->socketdes, buf, (*len), 0);
    } while (rv == -1 && errno == EINTR);

    if (rv == -1 && errno == EWOULDBLOCK && sock->timeout > 0) {
        ap_status_t arv = wait_for_io_or_timeout(sock, 0);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        }
        else {
            do {
                rv = send(sock->socketdes, buf, (*len), 0);
            } while (rv == -1 && errno == EINTR);
        }
    }
    if (rv == -1) {
        *len = 0;
        return errno;
    }
    (*len) = rv;
    return APR_SUCCESS;
}

ap_status_t ap_recv(ap_socket_t *sock, char *buf, ap_ssize_t *len)
{
    ap_ssize_t rv;
   
    do {
        rv = recv(sock->socketdes, buf, (*len), 0);
    } while (rv == -1 && errno == EINTR);

    if (rv == -1 && errno == EWOULDBLOCK && sock->timeout > 0) {
        ap_status_t arv = wait_for_io_or_timeout(sock, 1);
        if (arv != APR_SUCCESS) {
            *len = 0;
            return arv;
        }
        else {
            do {
                rv = recv(sock->socketdes, buf, (*len), 0);
            } while (rv == -1 && errno == EINTR);
        }
    }
    if (rv == -1) {
        (*len) = 0;
        return errno;
    }
    (*len) = rv;
    return APR_SUCCESS;
}