From: Aron Xu <aron@debian.org>
Date: Tue, 14 Feb 2012 23:02:00 +0800
Subject: serialized handling multiple clients

---
 netcat.c |   44 +++++++++++++++++++++-----------------------
 1 file changed, 21 insertions(+), 23 deletions(-)

--- a/netcat.c
+++ b/netcat.c
@@ -705,6 +705,23 @@ main(int argc, char *argv[])
 				s = unix_bind(host, 0);
 			else
 				s = unix_listen(host);
+		} else
+			s = local_listen(host, uport, hints);
+		if (s < 0)
+			err(1, NULL);
+
+		if (vflag && (family != AF_UNIX)) {
+			char* local;
+			if (family == AF_INET)
+				local = "0.0.0.0";
+			else if (family == AF_INET6)
+				local = "::";
+			else
+				local = "unknown";
+			fprintf(stderr, "Listening on [%s] (family %d, port %d)\n",
+				host ?: local,
+				family,
+				*uport);
 		}
 
 # if defined(TLS)
@@ -719,28 +736,6 @@ main(int argc, char *argv[])
 # endif
 		/* Allow only one connection at a time, but stay alive. */
 		for (;;) {
-			if (family != AF_UNIX) {
-				if (s != -1)
-					close(s);
-				s = local_listen(host, uport, hints);
-			}
-			if (s < 0)
-				err(1, NULL);
-
-			if (vflag && (family != AF_UNIX)) {
-				char* local;
-				if (family == AF_INET)
-					local = "0.0.0.0";
-				else if (family == AF_INET6)
-					local = "::";
-				else
-					local = "unknown";
-				fprintf(stderr, "Listening on [%s] (family %d, port %d)\n",
-					host ?: local,
-					family,
-					*uport);
-			}
-
 			if (uflag && kflag) {
 				/*
 				 * For UDP and -k, don't connect the socket,
@@ -814,8 +809,11 @@ main(int argc, char *argv[])
 					err(1, "connect");
 			}
 
-			if (!kflag)
+			if (!kflag) {
+				if (s != -1)
+					close(s);
 				break;
+			}
 		}
 	} else if (family == AF_UNIX) {
 		ret = 0;