| sadmac | Keybuk: what do you have in mind? | 02:05 |
|---|---|---|
| sadmac | Does the pid of the process get sent to post-start in any manner? | 04:21 |
| keesj | Hi | 08:17 |
| keesj | I finished my state machine thingy. | 08:17 |
| keesj | I now need to send event from within the kernel. it that possible? | 08:18 |
| Keybuk | sadmac: "status" will give it to you | 08:45 |
| keesj | re | 13:09 |
| keesj | I have two more interesting questions :P | 13:09 |
| keesj | it looks like when I perform an emit from one jobs it waits for the emit to be processesd before it returns | 13:11 |
| keesj | is there a way around this? (my job does a pivot_root) | 13:12 |
| keesj | hmm --no-wait helps | 13:23 |
| Keybuk | keesj: right, you found it ;) --no-wait <g> | 14:32 |
| Keybuk | also make sure the job is configured right | 14:32 |
| Keybuk | if the emit is waiting for the job to stop again, and it's a daemon, you need either "service" or "respawn" in the job | 14:32 |
| Keybuk | then emit will only wait until it's started | 14:32 |
| sadmac_ | Keybuk: so... logd... how do we replace it? | 15:55 |
| Keybuk | define what we want ;) | 16:03 |
| Keybuk | for me the main thing is to be able to capture output from jobs | 16:03 |
| Keybuk | and have that logged and not lost | 16:03 |
| Keybuk | (even if filesystem not mounted) | 16:03 |
| Keybuk | and maybe even mail that (cron-like) | 16:04 |
| keesj | what would service do? | 16:11 |
| sadmac_ | Keybuk: pushing it into syslog would do most of that. | 16:15 |
| keesj | cool, after a pivot root and a kill 1 it sill works (init apparently reloaded from a different partition) | 16:18 |
| Keybuk | sadmac_: indeed | 16:19 |
| sadmac_ | Keybuk: so the issue is: how do we attach a reliable file descriptor to processes and how do we get the input from there to syslog | 16:20 |
| Keybuk | sadmac_: right | 17:11 |
| Keybuk | and e.g. how does upstart tell the logging daemon that the output of a particular job should be e-mailed out | 17:11 |
| Keybuk | (since the job failed) | 17:11 |
| === phoenix24_ is now known as phoenix24 | ||
| sadmac_ | Keybuk: I'd assume upstart would have pipes open to the programs being logged, and simply stuff the output to syslog | 18:14 |
| Keybuk | that means init has to do quite a bit of work for every process running though, no? | 18:15 |
| sadmac_ | Keybuk: is there a way to open a socket direct to syslog? | 18:16 |
| sadmac_ | Keybuk: if we want to keep an external daemon, using ptys for each bothers me less and less. | 18:17 |
| Keybuk | yeah, the problem then is when that logging daemon dies | 18:19 |
| Keybuk | strange things happen to shell scripts | 18:20 |
| sadmac_ | Ahh, yeah, if you loose the master fd the pty still drops | 18:20 |
| sadmac_ | I know what kind of IO we need, and I can write a kernel module to support it, but I don't like the idea of pushing that upstream :( | 18:21 |
| Keybuk | hehe, indeed | 18:22 |
| sadmac_ | That's what I need to do, find some kernel devs. There's got to be a mechanism for this. | 18:23 |
| Keybuk | there probably is already | 18:23 |
| Keybuk | I just haven't read the relevant section of Stevens yet | 18:23 |
| Keybuk | logd is quite low on my priority list right now | 18:23 |
| Keybuk | the existing one "works" for people that want it | 18:24 |
| sadmac_ | Keybuk: which book is Stevens? | 18:24 |
| Keybuk | any of his | 18:25 |
| Keybuk | his Unix Network Programming series will have the likely answer | 18:25 |
| Keybuk | since that covers all types of sockets, file descriptors and IPC | 18:25 |
| sadmac_ | ahh, that one | 18:25 |
| sadmac_ | Keybuk: I've got it :) | 18:31 |
| sadmac_ | Keybuk: Pipe it to a file in /dev/shm | 18:32 |
| Keybuk | the book? | 18:32 |
| Keybuk | /dev/shm isn't mounted when init starts | 18:32 |
| sadmac_ | It could be. For us at least | 18:33 |
| sadmac_ | Hmm, and it turns out it doesn't spool the way I had hoped | 18:34 |
| Keybuk | some kind of shared ring buffer would be ideal | 18:35 |
| Keybuk | so the app could output freely | 18:36 |
| Keybuk | and a logging daemon could pick it up and read from it | 18:36 |
| Keybuk | but if it didn't, that wouldn't be bad | 18:36 |
| sadmac_ | exactly | 18:36 |
| sadmac_ | in fact what we need is very nearly the example from the linux device drivers book. | 18:36 |
| Keybuk | heh | 18:54 |
| * sadmac_ looks at list of known major numbers in linux kernel | 18:54 | |
| Keybuk | right, back tomorrow | 18:58 |
| * Keybuk heads to london | 18:58 | |
| sadmac_ | damn. he left | 18:58 |
| === elmarco|bzz is now known as elmarco | ||
| === Amaranth_ is now known as Amaranth | ||
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