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diff -up dhcp-4.2.5/configure.ac.sd-daemon dhcp-4.2.5/configure.ac
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--- dhcp-4.2.5/configure.ac.sd-daemon	2014-07-07 12:13:21.474322606 +0200
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+++ dhcp-4.2.5/configure.ac	2014-07-07 12:16:11.320964893 +0200
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@@ -714,6 +714,17 @@ if test x$ldap = xyes || test x$ldapcryp
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     fi
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 fi
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+AC_ARG_WITH(systemd,
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+        AC_HELP_STRING([--with-systemd],
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+                       [enable sending status notifications to systemd daemon (default is no)]),
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+        [systemd=$withval],
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+        [systemd=no])
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+
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+if test x$systemd = xyes ; then
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+   AC_CHECK_LIB(systemd-daemon, sd_notify, ,
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+                AC_MSG_FAILURE([*** sd-daemon library not present - do you need to install systemd-libs package?]))
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+fi
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+
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 # Append selected warning levels to CFLAGS before substitution (but after
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 # AC_TRY_COMPILE & etc).
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 CFLAGS="$CFLAGS $STD_CWARNINGS"
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diff -up dhcp-4.2.5/relay/dhcrelay.c.sd-daemon dhcp-4.2.5/relay/dhcrelay.c
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--- dhcp-4.2.5/relay/dhcrelay.c.sd-daemon	2014-07-07 12:13:21.329324619 +0200
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+++ dhcp-4.2.5/relay/dhcrelay.c	2014-07-07 12:13:21.475322592 +0200
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@@ -41,6 +41,10 @@
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    int keep_capabilities = 0;
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 #endif
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+#ifdef HAVE_LIBSYSTEMD_DAEMON
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+#include <systemd/sd-daemon.h>
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+#endif
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+
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 TIME default_lease_time = 43200; /* 12 hours... */
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 TIME max_lease_time = 86400; /* 24 hours... */
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 struct tree_cache *global_options[256];
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@@ -608,6 +612,14 @@ main(int argc, char **argv) {
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 	}
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 #endif
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+#ifdef HAVE_LIBSYSTEMD_DAEMON
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+        /* We are ready to process incomming packets. Let's notify systemd */
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+        sd_notifyf(0, "READY=1\n"
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+                   "STATUS=Dispatching packets...\n"
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+                   "MAINPID=%lu",
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+                   (unsigned long) getpid());
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+#endif
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+
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 	/* Start dispatching packets and timeouts... */
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 	dispatch();
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diff -up dhcp-4.2.5/server/dhcpd.c.sd-daemon dhcp-4.2.5/server/dhcpd.c
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--- dhcp-4.2.5/server/dhcpd.c.sd-daemon	2014-07-07 12:13:21.419323370 +0200
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+++ dhcp-4.2.5/server/dhcpd.c	2014-07-07 12:16:57.838319165 +0200
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@@ -60,6 +60,10 @@ static const char url [] =
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 #include "trace.h"
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+#ifdef HAVE_LIBSYSTEMD_DAEMON
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+#include <systemd/sd-daemon.h>
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+#endif
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+
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 #ifndef UNIT_TEST
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 static void usage(void);
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 #endif
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@@ -869,6 +873,15 @@ main(int argc, char **argv) {
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 			     (omapi_object_t *)0, "state", server_running);
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         TRACE(DHCPD_MAIN());
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+
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+#ifdef HAVE_LIBSYSTEMD_DAEMON
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+        /* We are ready to process incomming packets. Let's notify systemd */
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+        sd_notifyf(0, "READY=1\n"
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+                   "STATUS=Dispatching packets...\n"
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+                   "MAINPID=%lu",
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+                   (unsigned long) getpid());
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+#endif
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+
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 	/* Receive packets and dispatch them... */
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 	dispatch ();
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