--- Log opened Thu Apr 29 00:00:40 2021
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08:20 < unixb0y> 👋
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10:56 <@niftynei> rusty: is there a way to peek at a message on a fd without removing it?
10:56 <@niftynei> it'd be nice to be able to check if we've got any errors coming in from master while we're polling the peer (in some cases)
10:57 <@niftynei> but i don't want to process any incoming messages unless they're very specific "peer poll punching" types
10:57 <@niftynei> (failure, memleak)
10:58 < jasan> niftynei: pselect() or select() maybe? (man 2 select)
10:59 < jasan> nope
10:59 < jasan> this is not doing multiplexing
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11:07 < jasan> would that (reading a message from a fd without removing it) be equivalent of reading from a FIFO?
11:12 < jasan> one could surely read from fd and then fill the fd with the same it had read (while maybe locking so that no other input gets into the fd?)
11:13  * jasan is just daydreaming, no practical examples yet
11:13 < jasan> But https://www.systutorials.com/docs/linux/man/3p-FD_SET/ mentions multiplexing and is related to above-mentioned select()
11:29 < jasan> A practical example would be:
11:29 < jasan> cd /tmp
11:29 < jasan> mkdir teest
11:29 < jasan> cd teest
11:29 < jasan> mkfifo fifo1
11:29 < jasan> mkfifo fifo2
11:29 < jasan> echo test > fifo1
11:29 < jasan> tee fifo2 < fifo1
11:30 < jasan> ;;
11:42 < jasan> niftynei: To answer your original question (even though /me is not rusty) I think that no, it is not possible to peek at a message on a fd without removing it.
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13:35 < Ademan> Is there any documentation for how c-lightning routes payments, or do I just need to dig into the source?
14:12 < jasan> Ademan: That could be in the Lightning Network documentation. See https://lightning.network. c-lightning should just implement the protocol.
14:12 < jasan> For example https://github.com/lightningnetwork/lightning-rfc/blob/master/04-onion-routing.md#failure-messages
14:13 < Ademan> jasan: huh thanks, I thought I had read it was implementation specific, I guess it must have been out of date info
14:16 < Ademan> "The route is constructed by the origin node, which knows the public keys of each intermediate node and of the final node." hrm I think this is the step *after* what I'm interested in (how do they select the intermediate nodes)
14:18 < Ademan> I didn't even check BOLT because I had read it was implementation specific, maybe it's in here after all
14:18 < jasan> Ademan: If it says it is impl. specific than it should be so and I am wrong. Just see the source. I do not think there is any English-described way of what is happening under the hood of lightningd.
14:20 < Ademan> well I read the implementation specific part from an article from 2019 or 2018 so it could also be out of date. I'll check out the source, I probably should anyways heh
14:20 < jasan> I wish I could help more, but am not so deep in understanding c-lightning source yet.
14:20 < Ademan> np, you're still deeper than me haha
14:21 < jasan> :)
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--- Log closed Fri Apr 30 00:00:41 2021