network_io/beos/poll.c

/* ====================================================================
 * Copyright (c) 1999 The Apache Group.  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 Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * 4. The names "Apache Server" and "Apache Group" 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 Group.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``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 GROUP OR
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 *
 * This software consists of voluntary contributions made by many
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 * project, please see <http://www.apache.org/>.
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 */


#include "networkio.h"
#include "apr_network_io.h"
#include "networkio.h"
#include "apr_general.h"

/*  BeOS R4 doesn't have a poll function, but R5 will have */
/*  so for the time being we try our best with an implementaion that */
/*  uses select.  However, select on beos isn't that hot either, so */
/*  until R5 we have to live with a less than perfect implementation */

/*  Apparently those sneaky people at Be included support for write in */
/*  select for R4.5 of BeOS.  So here we use code that uses the write */
/*  bits. */
    
ap_status_t ap_setup_poll(ap_context_t *cont, ap_int32_t num, struct pollfd_t **
new)
{
    (*new) = (struct pollfd_t *)ap_palloc(cont, sizeof(struct pollfd_t) * num);
    if ((*new) == NULL) {
        return APR_ENOMEM;
    }
    (*new)->cntxt = cont;
    (*new)->read = (fd_set *)ap_palloc(cont, sizeof(fd_set));
    (*new)->write = (fd_set *)ap_palloc(cont, sizeof(fd_set));
    (*new)->except = (fd_set *)ap_palloc(cont, sizeof(fd_set));
    FD_ZERO((*new)->read);
    FD_ZERO((*new)->write);
    FD_ZERO((*new)->except);
    (*new)->highsock = -1;
    return APR_SUCCESS;
}

ap_status_t ap_add_poll_socket(struct pollfd_t *aprset,
                               struct socket_t *sock, ap_int16_t event)
{
    if (event & APR_POLLIN) {
        FD_SET(sock->socketdes, aprset->read);
    }
    if (event & APR_POLLPRI) {
        FD_SET(sock->socketdes, aprset->read);
    }
    if (event & APR_POLLOUT) {
        FD_SET(sock->socketdes, aprset->write);
    }
    if (sock->socketdes > aprset->highsock) {
        aprset->highsock = sock->socketdes;
    }
    return APR_SUCCESS;
}

ap_status_t ap_poll(struct pollfd_t *aprset, ap_int32_t *nsds, ap_int32_t timeout)
{
    int rv;
    struct timeval *thetime;

    if (timeout == -1) {
        thetime = NULL;
    }
    else {
        /* Convert milli-seconds into seconds and micro-seconds. */
        thetime = (struct timeval *)ap_palloc(aprset->cntxt, sizeof(struct timeval));
        thetime->tv_sec = timeout / (1000);
        timeout = timeout % 1000;
        thetime->tv_usec = timeout * 1000;
    }

    rv = select(aprset->highsock + 1, aprset->read, aprset->write, 
                    NULL, thetime);

    (*nsds) = rv;
    if ((*nsds) == 0) {
        return APR_TIMEUP;
    }
    if ((*nsds) < 0) {
        return APR_EEXIST;
    }
    return APR_SUCCESS;
}

ap_status_t ap_get_revents(struct pollfd_t *aprset, struct socket_t *sock, ap_int16_t *event)
{
    ap_int16_t revents = 0;
    char data[256];
    int dummy = 256;

    if (FD_ISSET(sock->socketdes, aprset->read)) {
        revents |= APR_POLLIN;
        if (recv(sock->socketdes, &data, 0, 0) == -1) {
            switch (errno) {
                case ECONNRESET:
                case ECONNABORTED:
                case ESHUTDOWN:
                case ENETRESET: {
                    revents ^= APR_POLLIN;
                    revents |= APR_POLLHUP;
                    break;
                }
                case ENOTSOCK: {
                    revents ^= APR_POLLIN;
                    revents |= APR_POLLNVAL;
                }
                default: {
                    revents ^= APR_POLLIN;
                    revents |= APR_POLLERR;
                }
            }
        }
    }
    if (FD_ISSET(sock->socketdes, aprset->write)) {
        revents |= APR_POLLOUT;
    }

    /* Still no support for execpt bits in BeOS R4.5 so for the time being */
    /* we can't check this.  Hopefully the error checking above will allow */
    /* sufficient errors to be recognised to cover this. */

    /*if (FD_ISSET(sock->socketdes, aprset->except)) {
        revents |= APR_POLLPRI;
    }*/

    (*event) = revents;
    return APR_SUCCESS;
}