Improved systemd socket activation support

Support for multiple unix sockets and activation in forking mode

Signed-off-by: Marius Tomaschewski <mt@suse.de>

1 files changed, 36 insertions, 3 deletions

diff --git a/tools/syslogd.c b/tools/syslogd.c
index 19a5900c..52c0be5f 100644
--- a/tools/syslogd.c
+++ b/tools/syslogd.c
@@ -2429,13 +2429,46 @@ 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 */
+			i = 3;
+
+			/* if (sd_booted()) */ {
+				const char *e;
+				char buf[24] = { '\0' };
+				char *p = NULL;
+				unsigned long l;
+				int 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);
 
-                       if (sd_listen_fds(0) <= 0)
-                               for (i = 3; i < num_fds; i++)
-                                       (void) close(i);
 			untty();
 		} else {
 			fputs(" Already running. If you want to run multiple instances, you need "