[newlib-cygwin/cygwin-2.0] Fix buffer size error handling in gethostname.

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=f7ddc49f40172ede26747c100b4132eb8680cf24

commit f7ddc49f40172ede26747c100b4132eb8680cf24
Author: Renato Silva <br.renatosi...@gmail.com>
Date:   Tue Mar 31 21:18:46 2015 +0200

    Fix buffer size error handling in gethostname.
    
        * net.cc (cygwin_gethostname): Fix buffer size error handling.
    
    Signed-off-by: Corinna Vinschen <cori...@vinschen.de>

Diff:
---
 winsup/cygwin/ChangeLog | 4 ++++
 winsup/cygwin/net.cc    | 5 ++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 68171f6..c4be231 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+2015-03-31  Renato Silva  <br.renatosi...@gmail.com>
+
+       * net.cc (cygwin_gethostname): Fix buffer size error handling.
+
 2015-03-31  Corinna Vinschen  <cori...@vinschen.de>
 
        * uinfo.cc (pwdgrp::fetch_account_from_windows): Don't allow fully
diff --git a/winsup/cygwin/net.cc b/winsup/cygwin/net.cc
index f9b317c..eaf6eb8 100644
--- a/winsup/cygwin/net.cc
+++ b/winsup/cygwin/net.cc
@@ -1076,7 +1076,10 @@ cygwin_gethostname (char *name, size_t len)
          if (!GetComputerNameExA (ComputerNameDnsFullyQualified, name,
                                   &local_len))
            {
-             set_winsock_errno ();
+             if (GetLastError () == ERROR_MORE_DATA)
+               set_errno (ENAMETOOLONG);
+             else
+               set_winsock_errno ();
              __leave;
            }
        }