* modules/arch/unix/mod_systemd.c: New module.

Submitted by: Jan Kaluza <jkaluza redhat.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1393976 13f79535-47bb-0310-9956-ffa450edef68

2 files changed, 116 insertions, 0 deletions

diff --git a/modules/arch/unix/config5.m4 b/modules/arch/unix/config5.m4
index 01c6e6938e..abfcee20bb 100644
--- a/modules/arch/unix/config5.m4
+++ b/modules/arch/unix/config5.m4
@@ -19,6 +19,19 @@ APACHE_MODULE(privileges, Per-virtualhost Unix UserIDs and enhanced security for
   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
diff --git a/modules/arch/unix/mod_systemd.c b/modules/arch/unix/mod_systemd.c
new file mode 100644
index 0000000000..0db076e21a
--- /dev/null
+++ b/modules/arch/unix/mod_systemd.c
@@ -0,0 +1,103 @@
+/* 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 systemd_pre_mpm(apr_pool_t *p, ap_scoreboard_e sb_type)
+{
+    int rv;
+    pid_t pid;
+    pid = getpid();
+
+    ap_extended_status = 1;
+
+    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, 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;
+
+    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);
+    }
+
+    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,
+};