On 1/26/2017 11:40 AM, David Guillen Fandos wrote:
> Genious! I didn't know about that thing!
> So you just dup the fd and close the old one right?
>
> Thanks!
> David
>
> On 26/01/17 16:41, Leif Thuresson wrote:
>> Just remembered an quirk we used to do way back to over come a problem
>> with old solaris versions where the
>> stdio struct used a char for the file descriptor.
>> If you have control over the file descriptors you application is
>> creating you can push them to higher numbers with
>> newfd = fcntl(orgfd, F_DUPFD, lowlimit);
>> leaving a range of low number file descriptors free to use for c-ares.
>> Yes it's ugly, but if nothing else helps...
>>
>> /Leif
>>
>>
It is possible for this to have a race condition in threaded programs if
your other threads are opening new sockets faster than they can be moved
to the high range. It's unlikely but make sure the code still has a
<FD_SETSIZE check before putting a FD into a select bitmap.
Received on 2017-01-26