File rsyslog-systemd-integration.bnc656104.diff of Package rsyslog.import5099

commit 020e414396b9ed4d005b6b0f6fb6567fe954230c
Author: Marius Tomaschewski <mt@suse.de>
Date:   Thu Jan 20 15:08:08 2011 +0100

    Improved systemd socket activation support
    
    Support for multiple unix sockets and activation in forking mode

commit f9a409137bdcd04ebf4851a23f573c436a14e5b2
Author: Rainer Gerhards <rgerhards@adiscon.com>
Date:   Wed Sep 8 12:46:03 2010 +0200

    moved systemd interface to rsyslog convenience lib
    
    Mostly a refresh of sd-daemon.[ch] from its source plus some make file changes.
    We now have systemd interfaces inside rsyslog, so that all plugins interested can
    call the interfaces. Seems not to be totally necessary right now, but will help
    in the long term.

commit be3d81ee54088180a657ac37899d1def8ef4b36c
Author: Rainer Gerhards <rgerhards@adiscon.com>
Date:   Tue Sep 7 14:19:05 2010 +0200

    added forgotten files

commit 8b7ca000dec71f6dcb73a8ab738093c17bd293c1
Author: Lennart Poettering <mailto:lennart@poettering.net>
Date:   Tue Sep 7 13:06:04 2010 +0200

    acquire /dev/log socket optionally from systemd
    
    [skipped whitespace-only changes -- mt@suse.de]
diff --git a/ChangeLog b/ChangeLog
index 89d5711..1e2aaa7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,5 @@
+- acquire /dev/log socket optionally from systemd
+  thanks to Lennart Poettering for this patch
 ---------------------------------------------------------------------------
 Version 5.6.5  [V5-STABLE] (rgerhards), 2011-03-22
 - bugfix: failover did not work correctly if repeated msg reduction was on
diff --git a/plugins/imuxsock/Makefile.am b/plugins/imuxsock/Makefile.am
index a2fe0ba..28f9f9e 100644
--- a/plugins/imuxsock/Makefile.am
+++ b/plugins/imuxsock/Makefile.am
@@ -1,6 +1,6 @@
 pkglib_LTLIBRARIES = imuxsock.la
 
 imuxsock_la_SOURCES = imuxsock.c
-imuxsock_la_CPPFLAGS = -I$(top_srcdir) $(PTHREADS_CFLAGS) $(RSRT_CFLAGS)
+imuxsock_la_CPPFLAGS = -DSD_EXPORT_SYMBOLS -I$(top_srcdir) $(PTHREADS_CFLAGS) $(RSRT_CFLAGS)
 imuxsock_la_LDFLAGS = -module -avoid-version
-imuxsock_la_LIBADD = 
+imuxsock_la_LIBADD = $(RSRT_LIBS)
diff --git a/plugins/imuxsock/imuxsock.c b/plugins/imuxsock/imuxsock.c
index 046f12f..fc6b1e7 100644
--- a/plugins/imuxsock/imuxsock.c
+++ b/plugins/imuxsock/imuxsock.c
@@ -47,6 +47,7 @@
 #include "prop.h"
 #include "debug.h"
 #include "unlimited_select.h"
+#include "sd-daemon.h"
 
 MODULE_TYPE_INPUT
 
@@ -86,6 +87,7 @@ static prop_t *funixHName[MAXFUNIX] = { NULL, }; /* host-name override - if set,
 static int funixFlowCtl[MAXFUNIX] = { eFLOWCTL_NO_DELAY, }; /* flow control settings for this socket */
 static int funix[MAXFUNIX] = { -1, }; /* read-only after startup */
 static int nfunix = 1; /* number of Unix sockets open / read-only after startup */
+static int sd_fds = 0; /* number of systemd activated sockers */
 
 /* config settings */
 static int bOmitLocalLogging = 0;
@@ -190,6 +192,20 @@ static int create_unix_socket(const char *path, int bCreatePath)
 	if (path[0] == '\0')
 		return -1;
 
+	if (sd_fds > 0) {
+		for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + sd_fds; fd++) {
+			if( sd_is_socket_unix(fd, SOCK_DGRAM, -1, path, 0) == 1) {
+				/* ok, it matches -- just use as is */
+				return fd;
+			}
+			/*
+			 * otherwise it either didn't matched *this* socket and
+			 * we just continue to check the next one or there were
+			 * an error and we will recreate it bellow.
+			 */
+		}
+	}
+
 	unlink(path);
 
 	memset(&sunx, 0, sizeof(sunx));
@@ -371,6 +387,11 @@ CODESTARTwillRun
 	if(pLogSockName != NULL)
 		funixn[0] = pLogSockName;
 
+	sd_fds = sd_listen_fds(0);
+	if (sd_fds < 0) {
+		errmsg.LogError(-sd_fds, NO_ERRCODE, "Failed to acquire systemd sockets");
+	}
+
 	/* initialize and return if will run or not */
 	for (i = startIndexUxLocalSockets ; i < nfunix ; i++) {
 		if ((funix[i] = create_unix_socket((char*) funixn[i], funixCreateSockPath[i])) != -1)
@@ -395,10 +416,19 @@ CODESTARTafterRun
 		if (funix[i] != -1)
 			close(funix[i]);
 
-	/* Clean-up files. */
-	for(i = startIndexUxLocalSockets; i < nfunix; i++)
-		if (funixn[i] && funix[i] != -1)
+	/* Clean-up files. If systemd passed us a socket it is
+	 * systemd's job to clean it up.*/
+	for(i = startIndexUxLocalSockets; i < nfunix; i++) {
+		if (funixn[i] && funix[i] != -1) {
+			if (sd_fds > 0 &&
+			    funix[i] >= SD_LISTEN_FDS_START &&
+			    funix[i] <  SD_LISTEN_FDS_START + sd_fds)
+				continue;
+
 			unlink((char*) funixn[i]);
+		}
+	}
+
 	/* free no longer needed string */
 	free(pLogSockName);
 	free(pLogHostName);
diff --git a/runtime/Makefile.am b/runtime/Makefile.am
index b700eae..27c56a2 100644
--- a/runtime/Makefile.am
+++ b/runtime/Makefile.am
@@ -82,6 +82,8 @@ librsyslog_la_SOURCES = \
 	prop.h \
 	cfsysline.c \
 	cfsysline.h \
+       sd-daemon.c \
+       sd-daemon.h \
 	\
 	\
 	../action.h \
@@ -100,9 +102,9 @@ librsyslog_la_SOURCES = \
 # runtime or will no longer be needed. -- rgerhards, 2008-06-13
 
 if WITH_MODDIRS
-librsyslog_la_CPPFLAGS = -D_PATH_MODDIR=\"$(pkglibdir)/:$(moddirs)\" $(PTHREADS_CFLAGS)
+librsyslog_la_CPPFLAGS = -DSD_EXPORT_SYMBOLS -D_PATH_MODDIR=\"$(pkglibdir)/:$(moddirs)\" $(PTHREADS_CFLAGS)
 else
-librsyslog_la_CPPFLAGS = -D_PATH_MODDIR=\"$(pkglibdir)/\" -I$(top_srcdir) $(PTHREADS_CFLAGS)
+librsyslog_la_CPPFLAGS = -DSD_EXPORT_SYMBOLS -D_PATH_MODDIR=\"$(pkglibdir)/\" -I$(top_srcdir) $(PTHREADS_CFLAGS)
 endif
 #librsyslog_la_LDFLAGS = -module -avoid-version
 librsyslog_la_LIBADD =  $(DL_LIBS) $(RT_LIBS)
@@ -178,3 +180,6 @@ lmnsd_gtls_la_LDFLAGS = -module -avoid-version
 lmnsd_gtls_la_LIBADD = $(GNUTLS_LIBS)
 endif
 
+update-systemd:
+       curl http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.c > sd-daemon.c
+       curl http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.h > sd-daemon.h
diff --git a/runtime/sd-daemon.c b/runtime/sd-daemon.c
new file mode 100644
index 0000000..9c23b91
--- /dev/null
+++ b/runtime/sd-daemon.c
@@ -0,0 +1,435 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  Copyright 2010 Lennart Poettering
+
+  Permission is hereby granted, free of charge, to any person
+  obtaining a copy of this software and associated documentation files
+  (the "Software"), to deal in the Software without restriction,
+  including without limitation the rights to use, copy, modify, merge,
+  publish, distribute, sublicense, and/or sell copies of the Software,
+  and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+***/
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/fcntl.h>
+#include <netinet/in.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "sd-daemon.h"
+
+int sd_listen_fds(int unset_environment) {
+
+#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
+        return 0;
+#else
+        int r, fd;
+        const char *e;
+        char *p = NULL;
+        unsigned long l;
+
+        if (!(e = getenv("LISTEN_PID"))) {
+                r = 0;
+                goto finish;
+        }
+
+        errno = 0;
+        l = strtoul(e, &p, 10);
+
+        if (errno != 0) {
+                r = -errno;
+                goto finish;
+        }
+
+        if (!p || *p || l <= 0) {
+                r = -EINVAL;
+                goto finish;
+        }
+
+        /* Is this for us? */
+        if (getpid() != (pid_t) l) {
+                r = 0;
+                goto finish;
+        }
+
+        if (!(e = getenv("LISTEN_FDS"))) {
+                r = 0;
+                goto finish;
+        }
+
+        errno = 0;
+        l = strtoul(e, &p, 10);
+
+        if (errno != 0) {
+                r = -errno;
+                goto finish;
+        }
+
+        if (!p || *p) {
+                r = -EINVAL;
+                goto finish;
+        }
+
+        for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) l; fd ++) {
+                int flags;
+
+                if ((flags = fcntl(fd, F_GETFD)) < 0) {
+                        r = -errno;
+                        goto finish;
+                }
+
+                if (flags & FD_CLOEXEC)
+                        continue;
+
+                if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
+                        r = -errno;
+                        goto finish;
+                }
+        }
+
+        r = (int) l;
+
+finish:
+        if (unset_environment) {
+                unsetenv("LISTEN_PID");
+                unsetenv("LISTEN_FDS");
+        }
+
+        return r;
+#endif
+}
+
+int sd_is_fifo(int fd, const char *path) {
+        struct stat st_fd;
+
+        if (fd < 0)
+                return -EINVAL;
+
+        memset(&st_fd, 0, sizeof(st_fd));
+        if (fstat(fd, &st_fd) < 0)
+                return -errno;
+
+        if (!S_ISFIFO(st_fd.st_mode))
+                return 0;
+
+        if (path) {
+                struct stat st_path;
+
+                memset(&st_path, 0, sizeof(st_path));
+                if (stat(path, &st_path) < 0) {
+
+                        if (errno == ENOENT || errno == ENOTDIR)
+                                return 0;
+
+                        return -errno;
+                }
+
+                return
+                        st_path.st_dev == st_fd.st_dev &&
+                        st_path.st_ino == st_fd.st_ino;
+        }
+
+        return 1;
+}
+
+static int sd_is_socket_internal(int fd, int type, int listening) {
+        struct stat st_fd;
+
+        if (fd < 0 || type < 0)
+                return -EINVAL;
+
+        if (fstat(fd, &st_fd) < 0)
+                return -errno;
+
+        if (!S_ISSOCK(st_fd.st_mode))
+                return 0;
+
+        if (type != 0) {
+                int other_type = 0;
+                socklen_t l = sizeof(other_type);
+
+                if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &other_type, &l) < 0)
+                        return -errno;
+
+                if (l != sizeof(other_type))
+                        return -EINVAL;
+
+                if (other_type != type)
+                        return 0;
+        }
+
+        if (listening >= 0) {
+                int accepting = 0;
+                socklen_t l = sizeof(accepting);
+
+                if (getsockopt(fd, SOL_SOCKET, SO_ACCEPTCONN, &accepting, &l) < 0)
+                        return -errno;
+
+                if (l != sizeof(accepting))
+                        return -EINVAL;
+
+                if (!accepting != !listening)
+                        return 0;
+        }
+
+        return 1;
+}
+
+union sockaddr_union {
+        struct sockaddr sa;
+        struct sockaddr_in in4;
+        struct sockaddr_in6 in6;
+        struct sockaddr_un un;
+        struct sockaddr_storage storage;
+};
+
+int sd_is_socket(int fd, int family, int type, int listening) {
+        int r;
+
+        if (family < 0)
+                return -EINVAL;
+
+        if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
+                return r;
+
+        if (family > 0) {
+                union sockaddr_union sockaddr;
+                socklen_t l;
+
+                memset(&sockaddr, 0, sizeof(sockaddr));
+                l = sizeof(sockaddr);
+
+                if (getsockname(fd, &sockaddr.sa, &l) < 0)
+                        return -errno;
+
+                if (l < sizeof(sa_family_t))
+                        return -EINVAL;
+
+                return sockaddr.sa.sa_family == family;
+        }
+
+        return 1;
+}
+
+int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) {
+        union sockaddr_union sockaddr;
+        socklen_t l;
+        int r;
+
+        if (family != 0 && family != AF_INET && family != AF_INET6)
+                return -EINVAL;
+
+        if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
+                return r;
+
+        memset(&sockaddr, 0, sizeof(sockaddr));
+        l = sizeof(sockaddr);
+
+        if (getsockname(fd, &sockaddr.sa, &l) < 0)
+                return -errno;
+
+        if (l < sizeof(sa_family_t))
+                return -EINVAL;
+
+        if (sockaddr.sa.sa_family != AF_INET &&
+            sockaddr.sa.sa_family != AF_INET6)
+                return 0;
+
+        if (family > 0)
+                if (sockaddr.sa.sa_family != family)
+                        return 0;
+
+        if (port > 0) {
+                if (sockaddr.sa.sa_family == AF_INET) {
+                        if (l < sizeof(struct sockaddr_in))
+                                return -EINVAL;
+
+                        return htons(port) == sockaddr.in4.sin_port;
+                } else {
+                        if (l < sizeof(struct sockaddr_in6))
+                                return -EINVAL;
+
+                        return htons(port) == sockaddr.in6.sin6_port;
+                }
+        }
+
+        return 1;
+}
+
+int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) {
+        union sockaddr_union sockaddr;
+        socklen_t l;
+        int r;
+
+        if ((r = sd_is_socket_internal(fd, type, listening)) <= 0)
+                return r;
+
+        memset(&sockaddr, 0, sizeof(sockaddr));
+        l = sizeof(sockaddr);
+
+        if (getsockname(fd, &sockaddr.sa, &l) < 0)
+                return -errno;
+
+        if (l < sizeof(sa_family_t))
+                return -EINVAL;
+
+        if (sockaddr.sa.sa_family != AF_UNIX)
+                return 0;
+
+        if (path) {
+                if (length <= 0)
+                        length = strlen(path);
+
+                if (length <= 0)
+                        /* Unnamed socket */
+                        return l == sizeof(sa_family_t);
+
+                if (path[0])
+                        /* Normal path socket */
+                        return
+                                (l >= sizeof(sa_family_t) + length + 1) &&
+                                memcmp(path, sockaddr.un.sun_path, length+1) == 0;
+                else
+                        /* Abstract namespace socket */
+                        return
+                                (l == sizeof(sa_family_t) + length) &&
+                                memcmp(path, sockaddr.un.sun_path, length) == 0;
+        }
+
+        return 1;
+}
+
+int sd_notify(int unset_environment, const char *state) {
+#if defined(DISABLE_SYSTEMD) || !defined(__linux__) || !defined(SOCK_CLOEXEC)
+        return 0;
+#else
+        int fd = -1, r;
+        struct msghdr msghdr;
+        struct iovec iovec;
+        union sockaddr_union sockaddr;
+        const char *e;
+
+        if (!state) {
+                r = -EINVAL;
+                goto finish;
+        }
+
+        if (!(e = getenv("NOTIFY_SOCKET")))
+                return 0;
+
+        /* Must be an abstract socket, or an absolute path */
+        if ((e[0] != '@' && e[0] != '/') || e[1] == 0) {
+                r = -EINVAL;
+                goto finish;
+        }
+
+        if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
+                r = -errno;
+                goto finish;
+        }
+
+        memset(&sockaddr, 0, sizeof(sockaddr));
+        sockaddr.sa.sa_family = AF_UNIX;
+        strncpy(sockaddr.un.sun_path, e, sizeof(sockaddr.un.sun_path));
+
+        if (sockaddr.un.sun_path[0] == '@')
+                sockaddr.un.sun_path[0] = 0;
+
+        memset(&iovec, 0, sizeof(iovec));
+        iovec.iov_base = (char*) state;
+        iovec.iov_len = strlen(state);
+
+        memset(&msghdr, 0, sizeof(msghdr));
+        msghdr.msg_name = &sockaddr;
+        msghdr.msg_namelen = sizeof(sa_family_t) + strlen(e);
+
+        if (msghdr.msg_namelen > sizeof(struct sockaddr_un))
+                msghdr.msg_namelen = sizeof(struct sockaddr_un);
+
+        msghdr.msg_iov = &iovec;
+        msghdr.msg_iovlen = 1;
+
+        if (sendmsg(fd, &msghdr, MSG_NOSIGNAL) < 0) {
+                r = -errno;
+                goto finish;
+        }
+
+        r = 1;
+
+finish:
+        if (unset_environment)
+                unsetenv("NOTIFY_SOCKET");
+
+        if (fd >= 0)
+                close(fd);
+
+        return r;
+#endif
+}
+
+int sd_notifyf(int unset_environment, const char *format, ...) {
+#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
+        return 0;
+#else
+        va_list ap;
+        char *p = NULL;
+        int r;
+
+        va_start(ap, format);
+        r = vasprintf(&p, format, ap);
+        va_end(ap);
+
+        if (r < 0 || !p)
+                return -ENOMEM;
+
+        r = sd_notify(unset_environment, p);
+        free(p);
+
+        return r;
+#endif
+}
+
+int sd_booted(void) {
+#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
+        return 0;
+#else
+
+        struct stat a, b;
+
+        /* We simply test whether the systemd cgroup hierarchy is
+         * mounted */
+
+        if (lstat("/sys/fs/cgroup", &a) < 0)
+                return 0;
+
+        if (lstat("/sys/fs/cgroup/systemd", &b) < 0)
+                return 0;
+
+        return a.st_dev != b.st_dev;
+#endif
+}
diff --git a/runtime/sd-daemon.h b/runtime/sd-daemon.h
new file mode 100644
index 0000000..45aac8b
--- /dev/null
+++ b/runtime/sd-daemon.h
@@ -0,0 +1,261 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foosddaemonhfoo
+#define foosddaemonhfoo
+
+/***
+  Copyright 2010 Lennart Poettering
+
+  Permission is hereby granted, free of charge, to any person
+  obtaining a copy of this software and associated documentation files
+  (the "Software"), to deal in the Software without restriction,
+  including without limitation the rights to use, copy, modify, merge,
+  publish, distribute, sublicense, and/or sell copies of the Software,
+  and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+***/
+
+#include <sys/types.h>
+#include <inttypes.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+  Reference implementation of a few systemd related interfaces for
+  writing daemons. These interfaces are trivial to implement. To
+  simplify porting we provide this reference implementation.
+  Applications are welcome to reimplement the algorithms described
+  here if they do not want to include these two source files.
+
+  The following functionality is provided:
+
+  - Support for logging with log levels on stderr
+  - File descriptor passing for socket-based activation
+  - Daemon startup and status notification
+  - Detection of systemd boots
+
+  You may compile this with -DDISABLE_SYSTEMD to disable systemd
+  support. This makes all those calls NOPs that are directly related to
+  systemd (i.e. only sd_is_xxx() will stay useful).
+
+  Since this is drop-in code we don't want any of our symbols to be
+  exported in any case. Hence we declare hidden visibility for all of
+  them.
+
+  You may find an up-to-date version of these source files online:
+
+  http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.h
+  http://cgit.freedesktop.org/systemd/plain/src/sd-daemon.c
+
+  This should compile on non-Linux systems, too, but with the
+  exception of the sd_is_xxx() calls all functions will become NOPs.
+
+  See sd-daemon(7) for more information.
+*/
+
+#if (__GNUC__ >= 4)
+#define _sd_printf_attr_(a,b) __attribute__ ((format (printf, a, b)))
+#  if defined(SD_EXPORT_SYMBOLS)
+#    define _sd_hidden_
+#  else
+#    define _sd_hidden_ __attribute__ ((visibility("hidden")))
+#  endif
+#else
+#define _sd_printf_attr_(a,b)
+#define _sd_hidden_
+#endif
+
+/*
+  Log levels for usage on stderr:
+
+          fprintf(stderr, SD_NOTICE "Hello World!\n");
+
+  This is similar to printk() usage in the kernel.
+*/
+#define SD_EMERG   "<0>"  /* system is unusable */
+#define SD_ALERT   "<1>"  /* action must be taken immediately */
+#define SD_CRIT    "<2>"  /* critical conditions */
+#define SD_ERR     "<3>"  /* error conditions */
+#define SD_WARNING "<4>"  /* warning conditions */
+#define SD_NOTICE  "<5>"  /* normal but significant condition */
+#define SD_INFO    "<6>"  /* informational */
+#define SD_DEBUG   "<7>"  /* debug-level messages */
+
+/* The first passed file descriptor is fd 3 */
+#define SD_LISTEN_FDS_START 3
+
+/*
+  Returns how many file descriptors have been passed, or a negative
+  errno code on failure. Optionally, removes the $LISTEN_FDS and
+  $LISTEN_PID file descriptors from the environment (recommended, but
+  problematic in threaded environments). If r is the return value of
+  this function you'll find the file descriptors passed as fds
+  SD_LISTEN_FDS_START to SD_LISTEN_FDS_START+r-1. Returns a negative
+  errno style error code on failure. This function call ensures that
+  the FD_CLOEXEC flag is set for the passed file descriptors, to make
+  sure they are not passed on to child processes. If FD_CLOEXEC shall
+  not be set, the caller needs to unset it after this call for all file
+  descriptors that are used.
+
+  See sd_listen_fds(3) for more information.
+*/
+int sd_listen_fds(int unset_environment) _sd_hidden_;
+
+/*
+  Helper call for identifying a passed file descriptor. Returns 1 if
+  the file descriptor is a FIFO in the file system stored under the
+  specified path, 0 otherwise. If path is NULL a path name check will
+  not be done and the call only verifies if the file descriptor
+  refers to a FIFO. Returns a negative errno style error code on
+  failure.
+
+  See sd_is_fifo(3) for more information.
+*/
+int sd_is_fifo(int fd, const char *path) _sd_hidden_;
+
+/*
+  Helper call for identifying a passed file descriptor. Returns 1 if
+  the file descriptor is a socket of the specified family (AF_INET,
+  ...) and type (SOCK_DGRAM, SOCK_STREAM, ...), 0 otherwise. If
+  family is 0 a socket family check will not be done. If type is 0 a
+  socket type check will not be done and the call only verifies if
+  the file descriptor refers to a socket. If listening is > 0 it is
+  verified that the socket is in listening mode. (i.e. listen() has
+  been called) If listening is == 0 it is verified that the socket is
+  not in listening mode. If listening is < 0 no listening mode check
+  is done. Returns a negative errno style error code on failure.
+
+  See sd_is_socket(3) for more information.
+*/
+int sd_is_socket(int fd, int family, int type, int listening) _sd_hidden_;
+
+/*
+  Helper call for identifying a passed file descriptor. Returns 1 if
+  the file descriptor is an Internet socket, of the specified family
+  (either AF_INET or AF_INET6) and the specified type (SOCK_DGRAM,
+  SOCK_STREAM, ...), 0 otherwise. If version is 0 a protocol version
+  check is not done. If type is 0 a socket type check will not be
+  done. If port is 0 a socket port check will not be done. The
+  listening flag is used the same way as in sd_is_socket(). Returns a
+  negative errno style error code on failure.
+
+  See sd_is_socket_inet(3) for more information.
+*/
+int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) _sd_hidden_;
+
+/*
+  Helper call for identifying a passed file descriptor. Returns 1 if
+  the file descriptor is an AF_UNIX socket of the specified type
+  (SOCK_DGRAM, SOCK_STREAM, ...) and path, 0 otherwise. If type is 0
+  a socket type check will not be done. If path is NULL a socket path
+  check will not be done. For normal AF_UNIX sockets set length to
+  0. For abstract namespace sockets set length to the length of the
+  socket name (including the initial 0 byte), and pass the full
+  socket path in path (including the initial 0 byte). The listening
+  flag is used the same way as in sd_is_socket(). Returns a negative
+  errno style error code on failure.
+
+  See sd_is_socket_unix(3) for more information.
+*/
+int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) _sd_hidden_;
+
+/*
+  Informs systemd about changed daemon state. This takes a number of
+  newline separated environment-style variable assignments in a
+  string. The following variables are known:
+
+     READY=1      Tells systemd that daemon startup is finished (only
+                  relevant for services of Type=notify). The passed
+                  argument is a boolean "1" or "0". Since there is
+                  little value in signalling non-readiness the only
+                  value daemons should send is "READY=1".
+
+     STATUS=...   Passes a single-line status string back to systemd
+                  that describes the daemon state. This is free-from
+                  and can be used for various purposes: general state
+                  feedback, fsck-like programs could pass completion
+                  percentages and failing programs could pass a human
+                  readable error message. Example: "STATUS=Completed
+                  66% of file system check..."
+
+     ERRNO=...    If a daemon fails, the errno-style error code,
+                  formatted as string. Example: "ERRNO=2" for ENOENT.
+
+     BUSERROR=... If a daemon fails, the D-Bus error-style error
+                  code. Example: "BUSERROR=org.freedesktop.DBus.Error.TimedOut"
+
+     MAINPID=...  The main pid of a daemon, in case systemd did not
+                  fork off the process itself. Example: "MAINPID=4711"
+
+  Daemons can choose to send additional variables. However, it is
+  recommened to prefix variable names not listed above with X_.
+
+  Returns a negative errno-style error code on failure. Returns > 0
+  if systemd could be notified, 0 if it couldn't possibly because
+  systemd is not running.
+
+  Example: When a daemon finished starting up, it could issue this
+  call to notify systemd about it:
+
+     sd_notify(0, "READY=1");
+
+  See sd_notifyf() for more complete examples.
+
+  See sd_notify(3) for more information.
+*/
+int sd_notify(int unset_environment, const char *state) _sd_hidden_;
+
+/*
+  Similar to sd_notify() but takes a format string.
+
+  Example 1: A daemon could send the following after initialization:
+
+     sd_notifyf(0, "READY=1\n"
+                   "STATUS=Processing requests...\n"
+                   "MAINPID=%lu",
+                   (unsigned long) getpid());
+
+  Example 2: A daemon could send the following shortly before
+  exiting, on failure:
+
+     sd_notifyf(0, "STATUS=Failed to start up: %s\n"
+                   "ERRNO=%i",
+                   strerror(errno),
+                   errno);
+
+  See sd_notifyf(3) for more information.
+*/
+int sd_notifyf(int unset_environment, const char *format, ...) _sd_printf_attr_(2,3) _sd_hidden_;
+
+/*
+  Returns > 0 if the system was booted with systemd. Returns < 0 on
+  error. Returns 0 if the system was not booted with systemd. Note
+  that all of the functions above handle non-systemd boots just
+  fine. You should NOT protect them with a call to this function. Also
+  note that this function checks whether the system, not the user
+  session is controlled by systemd. However the functions above work
+  for both session and system services.
+
+  See sd_booted(3) for more information.
+*/
+int sd_booted(void) _sd_hidden_;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/tools/syslogd.c b/tools/syslogd.c
index 1148108..e18101c 100644
--- a/tools/syslogd.c
+++ b/tools/syslogd.c
@@ -135,6 +135,7 @@
 #include "net.h"
 #include "vm.h"
 #include "prop.h"
+#include "sd-daemon.h"
 
 /* definitions for objects we access */
 DEFobjCurrIf(obj)
@@ -2433,10 +2434,44 @@ doGlblProcessInit(void)
 				 */
 				exit(1); /* "good" exit - after forking, not diasabling anything */
 			}
+
 			num_fds = getdtablesize();
 			close(0);
 			/* we keep stdout and stderr open in case we have to emit something */
-			for (i = 3; i < num_fds; i++)
+			i = 3;
+
+			/* if (sd_booted()) */ {
+				const char *e;
+				char buf[24] = { '\0' };
+				char *p = NULL;
+				unsigned long l;
+				int sd_fds;
+
+				/* fork & systemd socket activation:
+				 * fetch listen pid and update to ours,
+				 * when it is set to pid of our parent.
+				 */
+				if ( (e = getenv("LISTEN_PID"))) {
+					errno = 0;
+					l = strtoul(e, &p, 10);
+					if (errno ==  0 && l > 0 && (!p || !*p)) {
+						if (getppid() == (pid_t)l) {
+							snprintf(buf, sizeof(buf), "%d",
+								 getpid());
+							setenv("LISTEN_PID", buf, 1);
+						}
+					}
+				}
+
+				/*
+				 * close only all further fds, except
+				 * of the fds provided by systemd.
+				 */
+				sd_fds = sd_listen_fds(0);
+				if (sd_fds > 0)
+					i = SD_LISTEN_FDS_START + sd_fds;
+			}
+			for ( ; i < num_fds; i++)
 				(void) close(i);
 			untty();
 		}
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