---
 syslogd.c |  121 +++++++++++++++++++++++++++++++++++---------------------------
 1 file changed, 70 insertions(+), 51 deletions(-)

--- syslogd.c
+++ syslogd.c	2022-10-17 09:33:43.942759127 +0000
@@ -626,6 +626,9 @@ static volatile sig_atomic_t restart;
 int nfunix = 1;
 char *funixn[MAXFUNIX] = { _PATH_LOG };
 int funix[MAXFUNIX] = { -1, };
+#if defined(__linux__)
+int sd_fds = 0;
+#endif
 
 #ifdef UT_NAMESIZE
 # define UNAMESZ	UT_NAMESIZE	/* length of a login name */
@@ -1047,12 +1050,44 @@ int main(argc, argv)
 					exit(1);
 				}
 
+				i = 0;
 				num_fds = getdtablesize();
 #if defined(__linux__)
-				if (sd_listen_fds(0) <= 0)
-#endif
-					for (i = 0; i < num_fds; i++)
+				/* if (sd_booted()) */ {
+					const char *e;
+					char buf[24] = { '\0' };
+					char *p = NULL;
+					unsigned long l;
+
+					/* 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);
+							}
+						}
+					}
+
+					/*
+					 * init sd_fds and close all fds, except
+					 * of the fds provided by systemd.
+					 */
+					sd_fds = sd_listen_fds(0);
+					for( ; i < SD_LISTEN_FDS_START; i++)
 						(void) close(i);
+					if (sd_fds > 0)
+						i = SD_LISTEN_FDS_START + sd_fds;
+				}
+#endif
+				for ( ; i < num_fds; i++)
+					(void) close(i);
 				untty();
 				break;
 			}
@@ -1094,6 +1129,11 @@ int main(argc, argv)
 				exit(1);
 			}
 		} /* if ( !Debug ) */
+#if defined(__linux__)
+		/* if (sd_booted()) */ {
+			sd_fds = sd_listen_fds(0);
+		}
+#endif
 	}
 #endif
 
@@ -1367,54 +1407,30 @@ static int create_unix_socket(const char
 		return -1;
 
 #if defined(__linux__)
-	if (strcmp(path, _PATH_LOG) == 0) {
-		int r;
- 
-		/* Check whether an FD was passed in from systemd. If
-		 * so, it's the /dev/log socket, so use it. */
- 
-		r = sd_listen_fds(0);
-		if (r < 0) {
-			logerror("Failed to acquire systemd socket");
+	/*
+	 * Check whether an FD was passed in from systemd.
+	 * If so and it matches this socket, so use it.
+	 */
+	if (sd_fds < 0) {
+		logerror("Failed to acquire systemd socket");
 #ifndef SYSV
-			dienow();
+		dienow();
 #else
-			return -1;
+		return -1;
 #endif
-		}
+	}
 
- 
-		if (r > 1) {
-			logerror("Wrong number of systemd sockets passed");
-#ifndef SYSV
-			dienow();
-#else
-			return -1;
-#endif
-		}
- 
-		if (r == 1) {
-			fd = SD_LISTEN_FDS_START;
-			r = sd_is_socket_unix(fd, SOCK_DGRAM, -1, _PATH_LOG, 0);
-			if (r < 0) {
-				logerror("Failed to verify systemd socket type");
-#ifndef SYSV
-				dienow();
-#else
-				return -1;
-#endif
-			}
- 
-			if (!r) {
-				logerror("Passed systemd socket of wrong type");
-#ifndef SYSV
-				dienow();
-#else
-				return -1;
-#endif
+	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;
 			}
- 
-			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.
+			 */
 		}
 	}
 #endif
@@ -2537,14 +2553,17 @@ void dienow(void)
 	if (InetInuse) close(inetm);
 
 	/* Clean-up files. */
-	i = 0;
+	for (i = 0; i < nfunix; i++) {
+		if (funixn[i] && funix[i] != -1) {
 #if defined(__linux__)
-	if (sd_listen_fds(0) > 0)
-		i = 1;
+			if (sd_fds > 0 &&
+			    funix[i] >= SD_LISTEN_FDS_START &&
+			    funix[i] <  SD_LISTEN_FDS_START + sd_fds)
+				continue;
 #endif
-	for (; i < nfunix; i++)
-		if (funixn[i] && funix[i] != -1)
 			(void)unlink(funixn[i]);
+		}
+	}
 
 	for (lognum = 0; lognum <= nlogs; lognum++) {
 		f = &Files[lognum];