Josh Gao said "netcat -l -p 12345" broke:

  Previously, when trying to listen on a socket without using one of -4,
  -6, or -s, we tried to create an AF_UNSPEC socket, which fails.

1 files changed, 4 insertions, 0 deletions

diff --git a/toys/net/netcat.c b/toys/net/netcat.c
index 761d1f2a..57304f44 100644
--- a/toys/net/netcat.c
+++ b/toys/net/netcat.c
@@ -125,6 +125,10 @@ void netcat_main(void)
       } else {
         size_t bind_addrlen;
 
+        // If we weren't given an address with which to resolve which family to
+        // use, we have to choose.
+        if (family == AF_UNSPEC) family = AF_INET;
+
         address->sa_family = family;
 
         if (family == AF_INET6) {