Rewritten the I/O loop. All socket operations are now safe, meaning that

you can delete the socket from anywhere in the hooks and nothing should break.
Also, the receive/transmit buffers are now regular xmalloc()'ed buffers,
not separate resources which would need shuffling around between pools.

sk_close() is gone, use rfree() instead.

sysdep/unix/main.c

@@ -249,7 +249,7 @@ cli_err(sock *s, int err)
 	log(L_INFO "CLI connection closed");
     }
   cli_free(s->data);
-  sk_close(s);
+  rfree(s);
 }
 
 static int