1.7.1: Bind 9.6.0-P1 on Vista: could not listen on UDP socket: not enough free resources (patch attached)

[Andrey Repin]

Greetings, All!

>> >The workaround I found was to recompile the sources, but making sure
>> >that -DFD_SETSIZE=16384 is defined during the configure stage.  Patch
>> >attached below.
>> >
>> >Can someone please update the port with this bumped up FD_SETSIZE patch?
>> 
>> If FD_SETSIZE is used to control what goes into one of the fd_set arguments
>> to select() this won't work too well.
>> 
>> fd's are allocated monotonically starting with 0 so if accept() is really 
>> returning something greater than 63 someone should figure out why.

> Actually digging into it, named requires at least a minimum of 128.  It 
> then, as a result, issues fcntl(fd, FD_DUPFD, reserved), where reserved is
> the minimum value of 128 if the socket is determined to be a udp one.
> If fd's greater than 64 were truely invalid then duping the fd with the
> reserved range greater than 64 should have resulted in -1 with errno of 
> EBADF just like select did.

> Besides, I believe the only deficiency here is that bind's configure
> isn't smart enough to auto correct the FD_SETSIZE when it detects it's
> under cygwin.  Other utilities more than likely already do this part 
> automatically for you during the configure stage...

> Anyhow, I did a private build using cygport and the patch attached in my
> previous response, and the resulting named (and utilities/libraries) are
> working quite well.

This is still a problem, just hit it today. :(

Setting sockets to any number above 128 crashes named.exe.


-- 
With best regards,
Andrey Repin
Friday, November 29, 2019 17:08:06

Sorry for my terrible english...


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple