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Re: getaddrinfo : Non-recoverable failure in name resolution

On 6/23/2014 9:07 AM, Marco Atzeri wrote:

On 23/06/2014 14:25, Corinna Vinschen wrote:
Hi Marco,

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 ""

I don't know why this only fails for "".  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.

I wonder if this could explain the mysterious emacs crashes that have been reported on 64-bit Cygwin. The emacs code does set the hintp members manually in some places.

The crashes seem to occur randomly, and the backtraces often don't make sense.


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