From d6de1d9af7e97ad72198dc665fb6ef9a2634d0c4 Mon Sep 17 00:00:00 2001
From: VCC Live/Core <56296664+vcc-core@users.noreply.github.com>
Date: Thu, 30 Apr 2020 16:55:28 +0200
Subject: [PATCH] [Core] Add systemd sd_notify support

---
 Makefile.am              |  2 +-
 build/freeswitch.service |  4 ++++
 configure.ac             | 11 +++++++++++
 src/switch_core.c        | 12 ++++++++++++
 4 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index ac15c3d7a3..09d500a4d7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -248,7 +248,7 @@ endif
 lib_LTLIBRARIES	         = libfreeswitch.la
 libfreeswitch_la_CFLAGS  = $(CORE_CFLAGS) $(SQLITE_CFLAGS) $(GUMBO_CFLAGS) $(FVAD_CFLAGS) $(FREETYPE_CFLAGS) $(CURL_CFLAGS) $(PCRE_CFLAGS) $(SPEEX_CFLAGS) $(LIBEDIT_CFLAGS) $(openssl_CFLAGS) $(SOFIA_SIP_CFLAGS) $(AM_CFLAGS) $(TPL_CFLAGS)
 libfreeswitch_la_LDFLAGS = -version-info 1:0:0 $(AM_LDFLAGS) $(PLATFORM_CORE_LDFLAGS) -no-undefined
-libfreeswitch_la_LIBADD  = $(CORE_LIBS) $(APR_LIBS) $(SQLITE_LIBS) $(GUMBO_LIBS) $(FVAD_LIBS) $(FREETYPE_LIBS) $(CURL_LIBS) $(PCRE_LIBS) $(SPEEX_LIBS) $(LIBEDIT_LIBS) $(openssl_LIBS) $(PLATFORM_CORE_LIBS) $(TPL_LIBS) $(SPANDSP_LIBS) $(SOFIA_SIP_LIBS)
+libfreeswitch_la_LIBADD  = $(CORE_LIBS) $(APR_LIBS) $(SQLITE_LIBS) $(GUMBO_LIBS) $(FVAD_LIBS) $(FREETYPE_LIBS) $(CURL_LIBS) $(PCRE_LIBS) $(SPEEX_LIBS) $(LIBEDIT_LIBS) $(SYSTEMD_LIBS) $(openssl_LIBS) $(PLATFORM_CORE_LIBS) $(TPL_LIBS) $(SPANDSP_LIBS) $(SOFIA_SIP_LIBS)
 libfreeswitch_la_DEPENDENCIES = $(BUILT_SOURCES)
 
 if HAVE_PNG
diff --git a/build/freeswitch.service b/build/freeswitch.service
index ae6921b4df..2b0a035723 100644
--- a/build/freeswitch.service
+++ b/build/freeswitch.service
@@ -4,6 +4,10 @@ After=syslog.target network.target
 After=postgresql.service postgresql-9.3.service postgresql-9.4.service mysqld.service httpd.service
 
 [Service]
+# You can use Type=notify only if you compile FreeSWITCH with --enable-systemd configure option
+# In this case you have to run FreeSWITCH in foreground mode (-nf option)!
+#Type=notify
+#NotifyAccess=main
 User=freeswitch
 EnvironmentFile=-/etc/sysconfig/freeswitch
 # RuntimeDirectory is not yet supported in CentOS 7. A workaround is to use /etc/tmpfiles.d/freeswitch.conf
diff --git a/configure.ac b/configure.ac
index b5dfe74909..eb65a4765d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1578,6 +1578,17 @@ AS_IF([test "x$enable_core_libedit_support" != "xno"],[
       AC_MSG_ERROR([You need to either install libedit-dev (>= 2.11) or configure with --disable-core-libedit-support])
       ])])])
 
+AC_ARG_ENABLE(systemd,
+  [AS_HELP_STRING([--enable-systemd], [Compile with systemd notify support])])
+
+AS_IF([test "x$enable_systemd" = "xyes"],[
+  PKG_CHECK_MODULES([SYSTEMD], [libsystemd >= 219], [
+    AC_DEFINE([HAVE_SYSTEMD], [1], [Define to 1 if systemd is available])])
+])
+
+AC_SUBST(SYSTEMD_LIBS)
+
+
 dnl ---------------------------------------------------------------------------
 dnl - OpenLDAP SDK
 dnl ---------------------------------------------------------------------------
diff --git a/src/switch_core.c b/src/switch_core.c
index cacff3cdeb..ac6001c612 100644
--- a/src/switch_core.c
+++ b/src/switch_core.c
@@ -73,6 +73,10 @@
 #define pclose _pclose
 #endif
 
+#ifdef HAVE_SYSTEMD
+#include <systemd/sd-daemon.h>
+#endif
+
 SWITCH_DECLARE_DATA switch_directories SWITCH_GLOBAL_dirs = { 0 };
 SWITCH_DECLARE_DATA switch_filenames SWITCH_GLOBAL_filenames = { 0 };
 
@@ -2558,6 +2562,11 @@ SWITCH_DECLARE(switch_status_t) switch_core_init_and_modload(switch_core_flag_t
 		free(cmd);
 	}
 
+#ifdef HAVE_SYSTEMD
+	sd_notifyf(0, "READY=1\n"
+		"MAINPID=%lu\n", (unsigned long) getpid());
+#endif
+
 	return SWITCH_STATUS_SUCCESS;
 
 }
@@ -2880,6 +2889,9 @@ SWITCH_DECLARE(int32_t) switch_core_session_ctl(switch_session_ctl_t cmd, void *
 					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Restarting\n");
 				} else {
 					switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Shutting down\n");
+#ifdef HAVE_SYSTEMD
+					sd_notifyf(0, "STOPPING=1\n");
+#endif
 #ifdef _MSC_VER
 					fclose(stdin);
 #endif