| --- Log opened Sun Nov 09 00:00:53 2014 |
| 01:52 | <&ToxicFrog> | So I have a Python question. |
| 01:52 | <&ToxicFrog> | I have a tty python program that expects to be invoked via ssh or telnet. |
| 01:53 | <&ToxicFrog> | This means that at any time it could lose its controlling terminal when the network goes boom. |
| 01:53 | <&ToxicFrog> | There is some cleanup that needs to happen when this occurs. |
| 01:53 | <&ToxicFrog> | How do I do this? |
| 01:53 | <&ToxicFrog> | What does a python program see when its controlling terminal goes away? |
| 01:53 | <&Derakon> | Um. |
| 01:53 | <&Derakon> | At a guess, EOF on STDIN? |
| 01:53 | <&Derakon> | I have no idea though, really. |
| 02:01 | <&Derakon> | Hm, no, that doesn't seem to happen. |
| 02:03 | <&ToxicFrog> | I'm having a great deal of trouble figuring this out because of course once the controlling terminal is gone I can no longer see the program's output. |
| 02:04 | <&ToxicFrog> | And redirecting stderr just gets me an empty file. |
| 02:04 | <&ToxicFrog> | I would say "ok, it's eating a SIGPIPE and exiting immediately", but the python docs explicitly call out SIGPIPE as having a custom signal handler that turns it into a Python exception. |
| 02:05 | <&Derakon> | Here was my approach: http://pastebin.com/CBwGjNZ9 |
| 02:05 | <&Derakon> | Writing the program's output to a file would avoid the "can't see its output" problem, so long as you properly close the file when you're done. |
| 02:05 | <&ToxicFrog> | I ended up using strace. |
| 02:05 | <&ToxicFrog> | It looks like it gets SIGHUP, not SIGPIPE. |
| 02:05 | <&Derakon> | (Or at least periodically call flush(); the one call to flush() in that pastebin is kind of pointless though. Man my Python is rusty) |
| 02:06 | <&ToxicFrog> | Which makes sense. |
| 02:09 | <&ToxicFrog> | So I need to install a signal handler that traps SIGHUP, does cleanup, and then exits. |
| 02:34 | | * iospace runs SIGKILL on ToxicFrog |
| 02:34 | <@iospace> | o: |
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| 04:19 | <&ToxicFrog> | Recording and spectation are both working! \o/ |
| 04:24 | <&Derakon> | Nice. |
| 05:03 | <&ToxicFrog> | And the merged high scores list. |
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| 16:57 | <@Turaiel> | Is there something wrong with this mysql syntax? If so, I can't see it. ...if ABS(price - thePrice) <= ABS(price - closest) then... |
| 16:59 | <~Vornicus> | I don't see anything wrong with it |
| 16:59 | <~Vornicus> | What's the error message, and what's the full query? |
| 17:00 | <@Turaiel> | The full query is very long. I'm making a stored procedure. |
| 17:00 | <@Turaiel> | ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'end if; if ABS(price - thePrice) <= ABS(price - closest) then set closest = theP' at line 1 |
| 17:01 | <~Vornicus> | I'm going to pin it on something before the end if |
| 17:01 | <~Vornicus> | I'm absolutely stonking amazed at how bad the syntax checking is on mysql |
| 17:02 | <~Vornicus> | I don't think it was expecting the end if |
| 17:02 | <@Turaiel> | You're right |
| 17:03 | <@Turaiel> | The powerpoint for class did not say a semicolon was necessary after LEAVE priceLoop |
| 17:06 | <@Turaiel> | That only took forever |
| 17:07 | <@Turaiel> | http://i.imgur.com/87omaDf.png T.T |
| 17:07 | <~Vornicus> | T.T |
| 17:30 | <@Turaiel> | Welp, turns out I'm supposed to be using a function and not a procedure. Whoops. |
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| 17:38 | <~Vornicus> | uh huh. |
| 17:42 | <@Turaiel> | Do you happen to know why it's trying to find a declared variable within a field list from a query? |
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| 17:44 | <@Turaiel> | Killed him |
| 17:44 | <@Turaiel> | Oops |
| 18:11 | <@iospace> | gg |
| 18:14 | <@gnolam> | https://twitter.com/zapjackson/status/530941076492648448 |
| 18:41 | <@iospace> | gnolam: see my comments on #Fleet =P |
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| 22:28 | <&ToxicFrog> | So I have a pager question. |
| 22:28 | <&ToxicFrog> | I want people using this frontend I'm writing to be able to view large text files in a non-horrible manner. |
| 22:28 | <&ToxicFrog> | less(1) is the obvious answer to this. |
| 22:28 | <&ToxicFrog> | However, less has commands that can be used to read arbitrary files and execute arbitrary shell commands. |
| 22:28 | <&ToxicFrog> | Is there a "safe" version of less? |
| 22:31 | <@Tamber> | export LESSSECURE=1; less <whatever> |
| 22:32 | <@Tamber> | See the 'Security' section of the less manpage for the list of things it disables. :) |
| 22:32 | <&ToxicFrog> | Aah! |
| 22:32 | <&ToxicFrog> | I was looking at the command line flags and didn't thinkk |
| 22:32 | <&ToxicFrog> | to check for an envar |
| 22:32 | <&ToxicFrog> | alex says hu |
| 22:32 | <&ToxicFrog> | hi |
| 22:33 | <@Tamber> | :) |
| 22:33 | <@Tamber> | I just figured it had to be the sort of thing that would be included somewhere. |
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| 23:59 | <@[R]> | ToxicFrog: you shouldn't be calling less specifically, under normal circumstances, should be calling $PAGER (though that does make it harder to secure) |
| --- Log closed Mon Nov 10 00:00:09 2014 |