io.sockets: adding "broadcast port", ideally would just be +broadcast+ or something, but this works.

basis/io/sockets/sockets.factor

@@ -281,6 +281,8 @@ TUPLE: raw-port < port addr ;
 
 HOOK: (raw) io-backend ( addr -- raw )
 
+HOOK: (broadcast) io-backend ( datagram -- datagram )
+
 HOOK: (receive-unsafe) io-backend ( n buf datagram -- size addrspec )
 
 ERROR: invalid-port object ;
@@ -363,6 +365,9 @@ SYMBOL: remote-address
         >>addr
     ] with-destructors ;
 
+: <broadcast> ( datagram -- datagram )
+    <datagram> (broadcast) ;
+
 : receive-unsafe ( n buf datagram -- count addrspec )
     check-receive
     [ (receive-unsafe) ] [ addr>> ] bi parse-sockaddr ; inline

basis/io/sockets/unix/unix.factor

@@ -125,6 +125,9 @@ M: unix (datagram)
 M: unix (raw)
     [ SOCK_RAW server-socket-fd ] with-destructors ;
 
+M: unix (broadcast)
+    dup handle>> SOL_SOCKET SO_BROADCAST set-socket-option ;
+
 :: do-receive ( n buf port -- count sockaddr )
     port addr>> empty-sockaddr/size :> ( sockaddr len )
     port handle>> handle-fd ! s

basis/io/sockets/windows/windows.factor

@@ -8,6 +8,9 @@ windows.winsock locals ;
 FROM: namespaces => get ;
 IN: io.sockets.windows
 
+: set-socket-option ( handle level opt -- )
+    1 int <ref> dup byte-length setsockopt socket-error ;
+
 M: windows addrinfo-error ( n -- )
     winsock-return-check ;
 
@@ -86,6 +89,9 @@ M: windows (datagram) ( addrspec -- handle )
 M: windows (raw) ( addrspec -- handle )
     [ SOCK_RAW server-socket ] with-destructors ;
 
+M: windows (broadcast) ( datagram -- datagram )
+    dup handle>> SOL_SOCKET SO_BROADCAST set-socket-option ;
+
 : malloc-int ( n -- alien )
     int <ref> malloc-byte-array ; inline