set SO_REUSADDR if we are opening some sort of well-defined server port

1 files changed, 7 insertions, 2 deletions

diff --git a/lib/ZOpenPort.c b/lib/ZOpenPort.c
index 3116e9b..cf9a66e 100644
--- a/lib/ZOpenPort.c
+++ b/lib/ZOpenPort.c
@@ -22,6 +22,7 @@ ZOpenPort(u_short *port)
 {
     struct sockaddr_in bindin;
     unsigned int len;
+    int val = 1;
     
     (void) ZClosePort();
 
@@ -32,10 +33,14 @@ ZOpenPort(u_short *port)
 
     bindin.sin_family = AF_INET;
 
-    if (port && *port)
+    if (port && *port) {
 	bindin.sin_port = *port;
-    else
+	if (setsockopt(__Zephyr_fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof val) < 0) {
+	    return errno;
+	}
+    } else {
 	bindin.sin_port = 0;
+    }
 
     bindin.sin_addr.s_addr = INADDR_ANY;