--- httpd-2.4.3/modules/arch/unix/config5.m4.systemd

+++ httpd-2.4.3/modules/arch/unix/config5.m4

@@ -18,6 +18,19 @@ APACHE_MODULE(privileges, Per-virtualhos

   fi

 ])

+

+APACHE_MODULE(systemd, Systemd support, , , $unixd_mods_enabled, [

+  AC_CHECK_LIB(systemd-daemon, sd_notify, SYSTEMD_LIBS="-lsystemd-daemon")

+  AC_CHECK_HEADERS(systemd/sd-daemon.h, [ap_HAVE_SD_DAEMON_H="yes"], [ap_HAVE_SD_DAEMON_H="no"])

+  if test $ap_HAVE_SD_DAEMON_H = "no" || test -z "${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

--- httpd-2.4.3/modules/arch/unix/mod_systemd.c.systemd

+++ httpd-2.4.3/modules/arch/unix/mod_systemd.c

@@ -0,0 +1,138 @@

+/* 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 <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

+

+#define KBYTE 1024

+

+static pid_t pid;	/* PID of the main httpd instance */

+static int server_limit, thread_limit, threads_per_child, max_servers;

+static time_t last_update_time;

+static unsigned long last_update_access;

+static unsigned long last_update_kbytes;

+

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

+{

+    int rv;

+    last_update_time = time(0);

+

+    ap_mpm_query(AP_MPMQ_HARD_LIMIT_THREADS, &thread_limit);

+    ap_mpm_query(AP_MPMQ_HARD_LIMIT_DAEMONS, &server_limit);

+    ap_mpm_query(AP_MPMQ_MAX_THREADS, &threads_per_child);

+    /* work around buggy MPMs */

+    if (threads_per_child == 0)

+        threads_per_child = 1;

+    ap_mpm_query(AP_MPMQ_MAX_DAEMONS, &max_servers);

+

+    pid = getpid();

+    

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

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

+                    "MAINPID=%lu",

+                    (unsigned long) pid);

+    if (rv < 0) {

+        ap_log_perror(APLOG_MARK, APLOG_ERR, 0, p, 

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

+    }

+

+    return OK;

+}

+

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

+{

+    int i, j, res, rv;

+    process_score *ps_record;

+    worker_score *ws_record;

+    unsigned long access = 0;

+    unsigned long bytes = 0;

+    unsigned long kbytes = 0;

+    char bps[5];

+    time_t now = time(0);

+    time_t elapsed = now - last_update_time;

+

+    for (i = 0; i < server_limit; ++i) {

+        ps_record = ap_get_scoreboard_process(i);

+        for (j = 0; j < thread_limit; ++j) {

+            ws_record = ap_get_scoreboard_worker_from_indexes(i, j);

+            if (ap_extended_status && !ps_record->quiescing && ps_record->pid) {

+                res = ws_record->status;

+                if (ws_record->access_count != 0 || 

+                    (res != SERVER_READY && res != SERVER_DEAD)) {

+                    access += ws_record->access_count;

+                    bytes += ws_record->bytes_served;

+                    if (bytes >= KBYTE) {

+                        kbytes += (bytes >> 10);

+                        bytes = bytes & 0x3ff;

+                    }

+                }

+            }

+        }

+    }

+

+    apr_strfsize((unsigned long)(KBYTE *(float) (kbytes - last_update_kbytes)

+                                 / (float) elapsed), bps);

+

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

+                    "STATUS=Total requests: %lu; Current requests/sec: %.3g; "

+                    "Current traffic: %sB/sec\n", access,

+                    ((float)access - last_update_access) / (float) elapsed, bps);

+    if (rv < 0) {

+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s, APLOGNO(00000)

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

+    }

+

+    last_update_access = access;

+    last_update_kbytes = kbytes;

+    last_update_time = now;

+

+    return DECLINED;

+}

+

+static void systemd_register_hooks(apr_pool_t *p)

+{

+    /* 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);

+}

+

+module AP_MODULE_DECLARE_DATA systemd_module =

+{

+    STANDARD20_MODULE_STUFF,

+    NULL,

+    NULL,

+    NULL,

+    NULL,

+    NULL,

+    systemd_register_hooks,

+};