golden hour

/usr/include/apache2

File/Folder	Size	Actions
.mmn	14 B
ap_compat.h	1.05 KB
ap_config.h	6.45 KB
ap_config_auto.h	9.91 KB
ap_config_layout.h	2.52 KB
ap_expr.h	13.75 KB
ap_hooks.h	5.85 KB
ap_listen.h	6.19 KB
ap_mmn.h	39.59 KB
ap_mpm.h	10.51 KB
ap_provider.h	3.45 KB
ap_regex.h	11.14 KB
ap_regkey.h	8.97 KB
ap_release.h	3.07 KB
ap_slotmem.h	7.07 KB
ap_socache.h	9.18 KB
apache_noprobes.h	15.59 KB
cache_common.h	1.97 KB
heartbeat.h	1.56 KB
http_config.h	56.37 KB
http_connection.h	6.97 KB
http_core.h	36.4 KB
http_log.h	36.01 KB
http_main.h	3.17 KB
http_protocol.h	41.41 KB
http_request.h	25.72 KB
http_ssl.h	14.62 KB
http_vhost.h	4.49 KB
httpd.h	97.19 KB
mod_auth.h	4.42 KB
mod_cache.h	7.09 KB
mod_cgi.h	2.44 KB
mod_core.h	3.33 KB
mod_dav.h	97.85 KB
mod_dbd.h	4.06 KB
mod_http2.h	4.59 KB
mod_include.h	3.89 KB
mod_log_config.h	2.43 KB
mod_proxy.h	65.8 KB
mod_request.h	1.59 KB
mod_rewrite.h	1.36 KB
mod_session.h	6.61 KB
mod_so.h	1.2 KB
mod_ssl.h	4.87 KB
mod_ssl_openssl.h	4.8 KB
mod_status.h	2.38 KB
mod_unixd.h	1.09 KB
mod_watchdog.h	7.34 KB
mod_xml2enc.h	2.25 KB
mpm_common.h	17.09 KB
os.h	1.63 KB
scoreboard.h	9.94 KB
unixd.h	4.14 KB
util_cfgtree.h	3.08 KB
util_charset.h	2.21 KB
util_cookies.h	4.84 KB
util_ebcdic.h	2.69 KB
util_fcgi.h	9.75 KB
util_filter.h	25.84 KB
util_ldap.h	17.94 KB
util_md5.h	2.12 KB
util_mutex.h	9.07 KB
util_script.h	9.63 KB
util_time.h	4.1 KB
util_varbuf.h	8.09 KB
util_xml.h	1.31 KB

Edit: heartbeat.h

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file  heartbeat.h
 * @brief commun structures for mod_heartmonitor.c and mod_lbmethod_heartbeat.c
 *
 * @defgroup HEARTBEAT heartbeat
 * @ingroup  APACHE_MODS
 * @{
 */

#ifndef HEARTBEAT_H
#define HEARTBEAT_H

#include "apr.h"
#include "apr_time.h"

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Worse Case: IPv4-Mapped IPv6 Address
 * 0000:0000:0000:0000:0000:FFFF:255.255.255.255
 */
#define MAXIPSIZE  46
typedef struct hm_slot_server_t
{
    char ip[MAXIPSIZE];
    int busy;
    int ready;
    apr_time_t seen;
    int id;
} hm_slot_server_t;

/* default name of heartbeat data file, created in the configured
 * runtime directory when mod_slotmem_shm is not available
 */
#define DEFAULT_HEARTBEAT_STORAGE "hb.dat"

#ifdef __cplusplus
}
#endif

#endif /* HEARTBEAT_H */
/** @} */