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bug#23606: 25.1.50; "localhost" vs. ""

From: Ken Brown
Subject: bug#23606: 25.1.50; "localhost" vs. ""
Date: Tue, 24 May 2016 14:35:17 -0400
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

On 5/24/2016 1:20 PM, Achim Gratz wrote:
> Ken Brown writes:
>> The test echo-server-nowait in test/lisp/net/network-stream-tests.el
>> fails on Cygwin, but it passes if I create the client process using
>> "" instead of "localhost":
> This could be a case where it makes a difference if the IPv6 (::1) or
> IPv4 address is returned (first) for localhost.  IIRC, Windows and
> up-to-date Linux prefer IPv6 by default.  If so, it would likely be
> better to fix the parts of the code that assumes return of IPv4
> addresses only.

You're right.  In the test in question, IPv4 is specified for the server but 
not for the client.  The test passes on Cygwin if I specify IPv4 for the client 

diff --git a/test/lisp/net/network-stream-tests.el 
index c9b7cc7..f30c92a 100644
--- a/test/lisp/net/network-stream-tests.el
+++ b/test/lisp/net/network-stream-tests.el
@@ -145,6 +145,7 @@ server-process-filter
                                      :buffer (generate-new-buffer "*foo*")
                                      :host "localhost"
                                      :nowait t
+                                     :family 'ipv4
                                      :service port)))
     (should (eq (process-status proc) 'connect))
     (while (eq (process-status proc) 'connect)

Glenn, does this also fix the problem on RHEL 7.2?


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