kea/kea-sd-daemon.patch

diff --git a/config-report.sh.in b/config-report.sh.in
index 1af984e..ddd4b62 100755
--- a/config-report.sh.in
+++ b/config-report.sh.in
@@ -105,6 +105,18 @@ Netconf:              no
 HERE_DOCUMENT
 fi
 
+if test '@HAVE_LIBSYSTEMD_DAEMON@' != 'no'; then
+add_to_report <<HERE_DOCUMENT
+Systemd:              yes
+
+HERE_DOCUMENT
+else
+add_to_report <<HERE_DOCUMENT
+Systemd:              no
+
+HERE_DOCUMENT
+fi
+
 if test '@HAVE_GTEST@' != 'no'; then
 add_to_report <<HERE_DOCUMENT
 Google Test:          @GTEST_VERSION@
diff --git a/config.h.in b/config.h.in
index 42ccf28..cc6354a 100644
--- a/config.h.in
+++ b/config.h.in
@@ -52,6 +52,9 @@
 /* Check valgrind headers */
 #mesondefine HAVE_VALGRIND_HEADERS
 
+/* Support for systemd notification through sd_notify() enabled */
+#mesondefine HAVE_LIBSYSTEMD_DAEMON
+
 /* Whether libc is musl */
 #mesondefine LIBC_MUSL
 
diff --git a/meson.build b/meson.build
index 66e7fd0..dc86d89 100644
--- a/meson.build
+++ b/meson.build
@@ -100,6 +100,7 @@ krb5_opt = get_option('krb5')
 mysql_opt = get_option('mysql')
 netconf_opt = get_option('netconf')
 postgresql_opt = get_option('postgresql')
+systemd_opt = get_option('systemd')
 
 FUZZ_OPT = get_option('fuzz')
 TESTS_OPT = get_option('tests')
@@ -297,6 +298,13 @@ if netconf_opt.allowed()
     endif
 endif
 
+# Systemd
+SYSTEMD_DEP = disabler()
+if systemd_opt.enabled()
+    SYSTEMD_DEP = dependency('libsystemd')
+    conf_data.set('HAVE_LIBSYSTEMD_DAEMON', true)
+endif
+
 # Google Test
 GTEST_DEP = dependency(
     'gtest',
@@ -867,6 +875,11 @@ else
     report_conf_data.set('SYSREPOCPP_VERSION', 'no')
     report_conf_data.set('SYSREPOCPP_PREFIX', 'no')
 endif
+if SYSTEMD_DEP.found()
+    report_conf_data.set('HAVE_LIBSYSTEMD_DAEMON', 'yes')
+else
+    report_conf_data.set('HAVE_LIBSYSTEMD_DAEMON', 'no')
+endif
 if FUZZ_OPT.enabled() or TESTS_OPT.enabled()
     report_conf_data.set('HAVE_GTEST', 'yes')
     version = GTEST_DEP.version()
diff --git a/meson.options b/meson.options
index 5c222d5..3ecd2e1 100644
--- a/meson.options
+++ b/meson.options
@@ -27,6 +27,7 @@ option(
     type: 'feature',
     description: 'Support for PostgreSQL backends.',
 )
+option('systemd', type: 'feature', description: 'Support for systemd notification through sd_notify().')
 
 # Options for enabling testing code (not real features).
 option(
diff --git a/src/bin/dhcp4/main.cc b/src/bin/dhcp4/main.cc
index 4f88e29..5581b7a 100644
--- a/src/bin/dhcp4/main.cc
+++ b/src/bin/dhcp4/main.cc
@@ -24,6 +24,10 @@
 
 #include <iostream>
 
+#ifdef HAVE_LIBSYSTEMD_DAEMON
+#include <systemd/sd-daemon.h>
+#endif
+
 using namespace isc::data;
 using namespace isc::dhcp;
 using namespace isc::process;
@@ -290,6 +294,13 @@ main(int argc, char* argv[]) {
 
         // Tell the admin we are ready to process packets
         LOG_INFO(dhcp4_logger, DHCP4_STARTED).arg(VERSION);
+#ifdef HAVE_LIBSYSTEMD_DAEMON
+        // Notify systemd about the same
+        sd_notifyf(0, "READY=1\n"
+                   "STATUS=Dispatching packets...\n"
+                   "MAINPID=%lu",
+                   (unsigned long) getpid());
+#endif
 
         // And run the main loop of the server.
         ret = server.run();
diff --git a/src/bin/dhcp4/meson.build b/src/bin/dhcp4/meson.build
index 3dac320..e8cacb9 100644
--- a/src/bin/dhcp4/meson.build
+++ b/src/bin/dhcp4/meson.build
@@ -1,3 +1,8 @@
+kea_dhcp4_dependencies = [CRYPTO_DEP]
+if SYSTEMD_DEP.found()
+    kea_dhcp4_dependencies += [SYSTEMD_DEP]
+endif
+
 dhcp4_lib = static_library(
     'dhcp4',
     'client_handler.cc',
@@ -16,7 +21,7 @@ dhcp4_lib = static_library(
 kea_dhcp4 = executable(
     'kea-dhcp4',
     'main.cc',
-    dependencies: [CRYPTO_DEP],
+    dependencies: kea_dhcp4_dependencies,
     include_directories: [include_directories('.')] + INCLUDES,
     install: true,
     install_dir: SBINDIR,
diff --git a/src/bin/dhcp6/main.cc b/src/bin/dhcp6/main.cc
index 7ab1999..abac799 100644
--- a/src/bin/dhcp6/main.cc
+++ b/src/bin/dhcp6/main.cc
@@ -24,6 +24,10 @@
 
 #include <iostream>
 
+#ifdef HAVE_LIBSYSTEMD_DAEMON
+#include <systemd/sd-daemon.h>
+#endif
+
 using namespace isc::data;
 using namespace isc::dhcp;
 using namespace isc::process;
@@ -290,6 +294,13 @@ main(int argc, char* argv[]) {
 
         // Tell the admin we are ready to process packets
         LOG_INFO(dhcp6_logger, DHCP6_STARTED).arg(VERSION);
+#ifdef HAVE_LIBSYSTEMD_DAEMON
+        // Notify systemd about the same
+        sd_notifyf(0, "READY=1\n"
+                   "STATUS=Dispatching packets...\n"
+                   "MAINPID=%lu",
+                   (unsigned long) getpid());
+#endif
 
         // And run the main loop of the server.
         ret = server.run();
diff --git a/src/bin/dhcp6/meson.build b/src/bin/dhcp6/meson.build
index de60fbf..04a22a9 100644
--- a/src/bin/dhcp6/meson.build
+++ b/src/bin/dhcp6/meson.build
@@ -1,3 +1,8 @@
+kea_dhcp6_dependencies = [CRYPTO_DEP]
+if SYSTEMD_DEP.found()
+    kea_dhcp6_dependencies += [SYSTEMD_DEP]
+endif
+
 dhcp6_lib = static_library(
     'dhcp6',
     'client_handler.cc',
@@ -17,7 +22,7 @@ dhcp6_lib = static_library(
 kea_dhcp6 = executable(
     'kea-dhcp6',
     'main.cc',
-    dependencies: [CRYPTO_DEP],
+    dependencies: kea_dhcp6_dependencies,
     include_directories: [include_directories('.')] + INCLUDES,
     install: true,
     install_dir: SBINDIR,