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Re: getaddrinfo : Non-recoverable failure in name resolution
- From: Marco Atzeri <marco dot atzeri at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Mon, 23 Jun 2014 15:07:20 +0200
- Subject: Re: getaddrinfo : Non-recoverable failure in name resolution
- Authentication-results: sourceware.org; auth=none
- References: <53A81259 dot 4080300 at gmail dot com> <20140623122510 dot GD1803 at calimero dot vinschen dot de>
On 23/06/2014 14:25, Corinna Vinschen wrote:
On Jun 23 13:41, Marco Atzeri wrote:
64 $ ./getaddrinfo_test-2_64
getaddrinfo: Non-recoverable failure in name resolution
Am I missing something ?
The second way is currently used on postgresql in several places,
but it seems to fail only for "127.0.0.1"
I don't know why this only fails for "127.0.0.1". But this is clearly a
problem in the 64 bit Cygwin DLL.
What happens is that the field ai_addrlen is defined as socklen_t in
POSIX, but as size_t in the W32 API. On 64 bit, socklen_t is 4 bytes
while size_t is 8 bytes. Setting all the hintp members manually (in
contrast to calloc'ing it or memset'ing it to 0) leaves the 4 upper
bytes of the ai_addrlen untouched. This in turn leads to a high
probability that ai_addrlen has an invalid value when entering Winsock's
I'm really surprised this hasn't been hit before. I'm going to fix that
in Cygwin by setting the upper 4 bytes of ai_addrlen to 0 explicitely.
Probably we have seen already but not identified.
For the time being, you might prepend
memset (&hintp, 0, sizeof hintp);
to the code, prior to setting the elements manually.
I will wait next snapshot.
PostgreSQL 9.4 is still on Beta 1, so I am not in a hurry to release
a new version
Thanks for the testcase. Much appreciated,
Thanks for the solution
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