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- /* ====================================================================
- * Copyright (c) 1995-1999 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
- * 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 Group and was originally based
- * on public domain software written at the National Center for
- * Supercomputing Applications, University of Illinois, Urbana-Champaign.
- * For more information on the Apache Group and the Apache HTTP server
- * project, please see <http://www.apache.org/>.
- *
- */
-
- /*
- * ap_slack.c: File descriptor preallocation
- *
- * 3/21/93 Rob McCool
- * 1995-96 Many changes by the Apache Group
- *
- */
-
- #include "httpd.h"
- #include "http_log.h"
-
- #ifndef NO_SLACK
- int ap_slack(int fd, int line)
- {
- #if !defined(F_DUPFD)
- return fd;
- #else
- static int low_warned;
- int new_fd;
-
- #ifdef HIGH_SLACK_LINE
- if (line == AP_SLACK_HIGH && fd < HIGH_SLACK_LINE) {
- new_fd = fcntl(fd, F_DUPFD, HIGH_SLACK_LINE);
- if (new_fd != -1) {
- close(fd);
- return new_fd;
- }
- }
- #endif
- /* otherwise just assume line == AP_SLACK_LOW */
- if (fd >= LOW_SLACK_LINE) {
- return fd;
- }
- new_fd = fcntl(fd, F_DUPFD, LOW_SLACK_LINE);
- if (new_fd == -1) {
- if (!low_warned) {
- /* Give them a warning here, because we really can't predict
- * how libraries and such are going to fail. If we can't
- * do this F_DUPFD there's a good chance that apache has too
- * few descriptors available to it. Note we don't warn on
- * the high line, because if it fails we'll eventually try
- * the low line...
- */
- ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
- "unable to open a file descriptor above %u, "
- "you may need to increase the number of descriptors",
- LOW_SLACK_LINE);
- low_warned = 1;
- }
- return fd;
- }
- close(fd);
- return new_fd;
- #endif
- }
- #else
- /* need at least one function in the file for some linkers */
- void ap_slack_is_not_here(void) {}
- #endif /* NO_SLACK */
-