text: /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000-2002 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 "fileio.h"
  #include "networkio.h"
  #include "apr_poll.h"
  #include "apr_errno.h"
  #include "apr_support.h"
  
  /* The only case where we don't use wait_for_io_or_timeout is on
   * pre-BONE BeOS, so this check should be sufficient and simpler */
  #if !BEOS_R5
  #define USE_WAIT_FOR_IO
  #endif
  
  #ifdef USE_WAIT_FOR_IO
  apr_status_t apr_wait_for_io_or_timeout(apr_file_t *f, apr_socket_t *s,
                                             int for_read)
  {
      apr_interval_time_t timeout;
      apr_pollfd_t pollset;
      int srv, n;
      int type = for_read ? APR_POLLIN : APR_POLLOUT;
  
      /* TODO - timeout should be less each time through this loop */
      if (f) {
          pollset.desc_type = APR_POLL_FILE;
          pollset.desc.f = f;
          pollset.p = f->pool;
          timeout = f->timeout;
      }
      else {
          pollset.desc_type = APR_POLL_SOCKET;
          pollset.desc.s = s;
          pollset.p = s->cntxt;
          timeout = s->timeout;
      }
      pollset.reqevents = type;
  
      do {
          srv = apr_poll(&pollset, 1, &n, timeout);
  
          if (n == 1 && pollset.rtnevents & type) {
              return APR_SUCCESS;
          }
      } while (APR_STATUS_IS_EINTR(srv));
  
      return srv;
  }
  #endif
  
  