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Re: WSAPoll() anyone?
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From: Daniel Stenberg via curl-library <curl-library_at_lists.haxx.se>
Date: Tue, 5 Jul 2022 16:37:00 +0200 (CEST)
On Tue, 5 Jul 2022, Gisle Vanem via curl-library wrote:
> But it looks like things in Winsock has improved in 10 years. Experimenting
> with using WSAPoll()' in select.c, it works fine except for the 'POLLPRI'
> bit (throwing 'WSAEINVAL').
Is there a compelling reason to switch over to WSAPoll()?
It took a long time before we found that poll issue the last time. If there is
an edge case still where they aren't compatible, I can imagine it won't be
easy to reproduce but might introduce strange hard-to-debug side effects down
the line.
Since we don't know in which Windows version the function was fixed, we might
still have curl users with broken WSAPoll implementations - even if more
recent versions work better.
> Perhaps this could be configurable? Like in nmap --nsock-engine=poll, nmap
> --nsock-engine=iocp etc?
I don't think so. When would a user ever try to use that option? Who would
even understand it?
Date: Tue, 5 Jul 2022 16:37:00 +0200 (CEST)
On Tue, 5 Jul 2022, Gisle Vanem via curl-library wrote:
> But it looks like things in Winsock has improved in 10 years. Experimenting
> with using WSAPoll()' in select.c, it works fine except for the 'POLLPRI'
> bit (throwing 'WSAEINVAL').
Is there a compelling reason to switch over to WSAPoll()?
It took a long time before we found that poll issue the last time. If there is
an edge case still where they aren't compatible, I can imagine it won't be
easy to reproduce but might introduce strange hard-to-debug side effects down
the line.
Since we don't know in which Windows version the function was fixed, we might
still have curl users with broken WSAPoll implementations - even if more
recent versions work better.
> Perhaps this could be configurable? Like in nmap --nsock-engine=poll, nmap
> --nsock-engine=iocp etc?
I don't think so. When would a user ever try to use that option? Who would
even understand it?
-- / daniel.haxx.se | Commercial curl support up to 24x7 is available! | Private help, bug fixes, support, ports, new features | https://curl.se/support.html -- Unsubscribe: https://lists.haxx.se/listinfo/curl-library Etiquette: https://curl.se/mail/etiquette.htmlReceived on 2022-07-05