nc: allow immediate reuse of ports.

Set SO_REUSEADDR when listening so that we can immediately reuse ports
that are no longer being listened upon, instead of having to wait 60
seconds for the socket to be shutdown after being closed (even on
localhost!).

1 files changed, 6 insertions, 0 deletions

diff --git a/toys/net/netcat.c b/toys/net/netcat.c
index cd05dcf3..3f08b5f7 100644
--- a/toys/net/netcat.c
+++ b/toys/net/netcat.c
@@ -140,6 +140,12 @@ void netcat_main(void)
         }
 
         sockfd = xsocket(family, type, 0);
+
+        {
+          int val = 1;
+          xsetsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
+        }
+
         if (bind(sockfd, address, bind_addrlen))
           perror_exit("bind");
       }