diff -uap httpd-2.4.27/modules/arch/unix/config5.m4.systemd httpd-2.4.27/modules/arch/unix/config5.m4

diff -uap httpd-2.4.27/modules/arch/unix/config5.m4.systemd httpd-2.4.27/modules/arch/unix/config5.m4

diff -uap httpd-2.4.27/modules/arch/unix/config5.m4.systemd httpd-2.4.27/modules/arch/unix/config5.m4

diff -uap httpd-2.4.27/modules/arch/unix/config5.m4.systemd httpd-2.4.27/modules/arch/unix/config5.m4

--- httpd-2.4.27/modules/arch/unix/config5.m4.systemd

+++ httpd-2.4.27/modules/arch/unix/config5.m4

@@ -18,6 +18,16 @@

   fi

 ])

+APACHE_MODULE(systemd, Systemd support, , , all, [

+  if test "${ac_cv_header_systemd_sd_daemon_h}" = "no" || test -z "${SYSTEMD_LIBS}"; then

+    AC_MSG_WARN([Your system does not support systemd.])

+    enable_systemd="no"

+  else

+    APR_ADDTO(MOD_SYSTEMD_LDADD, [$SYSTEMD_LIBS])

+    enable_systemd="yes"

+  fi

+])

+

 APR_ADDTO(INCLUDES, [-I\$(top_srcdir)/$modpath_current])

 APACHE_MODPATH_FINISH

diff -uap httpd-2.4.27/modules/arch/unix/mod_systemd.c.systemd httpd-2.4.27/modules/arch/unix/mod_systemd.c

--- httpd-2.4.27/modules/arch/unix/mod_systemd.c.systemd

+++ httpd-2.4.27/modules/arch/unix/mod_systemd.c

@@ -0,0 +1,161 @@

+/* 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.

+ * 

+ */

+

+#include <stdint.h>

+#include <ap_config.h>

+#include "ap_mpm.h"

+#include <http_core.h>

+#include <httpd.h>

+#include <http_log.h>

+#include <apr_version.h>

+#include <apr_pools.h>

+#include <apr_strings.h>

+#include "unixd.h"

+#include "scoreboard.h"

+#include "mpm_common.h"

+

+#include "systemd/sd-daemon.h"

+

+#if APR_HAVE_UNISTD_H

+#include <unistd.h>

+#endif

+

+static int shutdown_timer = 0;

+static int shutdown_counter = 0;

+static unsigned long bytes_served;

+static pid_t mainpid;

+

+static int systemd_pre_config(apr_pool_t *pconf, apr_pool_t *plog,

+                              apr_pool_t *ptemp)

+{

+    sd_notify(0,

+              "RELOADING=1\n"

+              "STATUS=Reading configuration...\n");

+    ap_extended_status = 1;

+    return OK;

+}

+

+static int systemd_pre_mpm(apr_pool_t *p, ap_scoreboard_e sb_type)

+{

+    int rv;

+

+    mainpid = getpid();

+

+    rv = sd_notifyf(0, "READY=1\n"

+                    "STATUS=Processing requests...\n"

+                    "MAINPID=%" APR_PID_T_FMT, mainpid);

+    if (rv < 0) {

+        ap_log_perror(APLOG_MARK, APLOG_ERR, 0, p, APLOGNO(02395)

+                     "sd_notifyf returned an error %d", rv);

+    }

+

+    return OK;

+}

+

+static int systemd_monitor(apr_pool_t *p, server_rec *s)

+{

+    ap_sload_t sload;

+    apr_interval_time_t up_time;

+    char bps[5];

+    int rv;

+

+    if (!ap_extended_status) {

+        /* Nothing useful to report if ExtendedStatus disabled. */

+        return DECLINED;

+    }

+    

+    ap_get_sload(&sload);

+    /* up_time in seconds */

+    up_time = (apr_uint32_t) apr_time_sec(apr_time_now() -

+                               ap_scoreboard_image->global->restart_time);

+

+    apr_strfsize((unsigned long)((float) (sload.bytes_served)

+                                 / (float) up_time), bps);

+

+    rv = sd_notifyf(0, "READY=1\n"

+                    "STATUS=Total requests: %lu; Idle/Busy workers %d/%d;"

+                    "Requests/sec: %.3g; Bytes served/sec: %sB/sec\n",

+                    sload.access_count, sload.idle, sload.busy,

+                    ((float) sload.access_count) / (float) up_time, bps);

+

+    if (rv < 0) {

+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02396)

+                     "sd_notifyf returned an error %d", rv);

+    }

+

+    /* Shutdown httpd when nothing is sent for shutdown_timer seconds. */

+    if (sload.bytes_served == bytes_served) {

+        /* mpm_common.c: INTERVAL_OF_WRITABLE_PROBES is 10 */

+        shutdown_counter += 10;

+        if (shutdown_timer > 0 && shutdown_counter >= shutdown_timer) {

+            rv = sd_notifyf(0, "READY=1\n"

+                            "STATUS=Stopped as result of IdleShutdown "

+                            "timeout.");

+            if (rv < 0) {

+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(02804)

+                            "sd_notifyf returned an error %d", rv);

+            }

+            kill(mainpid, AP_SIG_GRACEFUL);

+        }

+    }

+    else {

+        shutdown_counter = 0;

+    }

+

+    bytes_served = sload.bytes_served;

+

+    return DECLINED;

+}

+

+static void systemd_register_hooks(apr_pool_t *p)

+{

+    /* Enable ap_extended_status. */

+    ap_hook_pre_config(systemd_pre_config, NULL, NULL, APR_HOOK_LAST);

+    /* We know the PID in this hook ... */

+    ap_hook_pre_mpm(systemd_pre_mpm, NULL, NULL, APR_HOOK_LAST);

+    /* Used to update httpd's status line using sd_notifyf */

+    ap_hook_monitor(systemd_monitor, NULL, NULL, APR_HOOK_MIDDLE);

+}

+

+static const char *set_shutdown_timer(cmd_parms *cmd, void *dummy,

+                                      const char *arg)

+{

+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);

+    if (err != NULL) {

+        return err;

+    }

+

+    shutdown_timer = atoi(arg);

+    return NULL;

+}

+

+static const command_rec systemd_cmds[] =

+{

+AP_INIT_TAKE1("IdleShutdown", set_shutdown_timer, NULL, RSRC_CONF,

+     "Number of seconds in idle-state after which httpd is shutdown"),

+    {NULL}

+};

+

+AP_DECLARE_MODULE(systemd) = {

+    STANDARD20_MODULE_STUFF,

+    NULL,

+    NULL,

+    NULL,

+    NULL,

+    systemd_cmds,

+    systemd_register_hooks,

+};