-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Martin Pool wrote: > On 17 August 2010 11:48, Michael Hudson <[email protected]> wrote: >>>>> The last is a bit of an approximation, because my test front end hack >>>>> uses select.poll() over file descriptors, and doesn't seem to be getting >>>>> POLLHUP on any of the fifos. >>>> I don't entirely understand the consequence of this :-) >>> So the big takeaway is 2.4s => 0.08s. >> I understood that bit! :-) >> >>> There is some concern that we won't easily detect when the smart >>> server is finished going this route. As I at least wasn't seeing it >>> disconnect from the fifo (echo foo > script, sends a POLLHUP event to >>> select when the input is finished, I wasn't seeing that when lp-serve >>> on the other side of a fifo finished.) >> Ah, I see. > > According to the poll(2) manpage and my rusty understanding, you get > POLLHUP only when the remote end closes a socket you're trying to > write to, and probably only if this causes you to lose > already-buffered data. If the client closes a socket you're trying to > read from, I would expect you to get POLLIN and then find an EOF, or > to get POLLRDHUP (which may not be exposed in Python.) > > It's great to see this coming along.
Well, I *am* getting it when stdin finishes. I do have some code that says "if event & POLLIN and not bytes" (if I got the POLLIN event but there was no content) consider the connection closed. But I don't seem to be getting that. Which is also weird because 'cat /.../fifo' finishes correctly. Anyway, ideally I wouldn't need the proxy in the middle, and just have that done in the twisted code. I'm still a little concerned about detecting process lifetimes and exit codes (if they matter to twisted), since this process isn't a direct child. Should I be trying to convey that information via another channel? John =:-> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (Cygwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkxqmRMACgkQJdeBCYSNAAN1igCgyDrqtU8rHUAC0sYy5lXy3nb6 1qMAmwYkGWk/Yg4wsvvz01KC07aIw3p4 =Sf4U -----END PGP SIGNATURE----- _______________________________________________ Mailing list: https://launchpad.net/~launchpad-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~launchpad-dev More help : https://help.launchpad.net/ListHelp
