| --- Log opened Mon Sep 24 00:00:34 2007 |
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| 01:12 | < MinceR> | gn |
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| 05:18 | <@McMartin> | Hmm. |
| 05:18 | | * McMartin mumbles |
| 05:18 | <@McMartin> | I wonder if Ophis runs on Python 2.3 |
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| 14:01 | <@jerith> | http://manetheren.cl.msu.edu/~vanhoose/humor/0332.html |
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| 14:53 | < MinceR> | r4wr |
| 14:54 | | * AnnoDomini rolls eyes. |
| 14:55 | < MinceR> | !eyes |
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| 16:46 | <@ToxicFrog> | Gnar. |
| 16:46 | <@ToxicFrog> | I think I'm going to have to implement this in terms of thoth message passes, which means an extra thread for each socket. |
| 16:46 | <@ToxicFrog> | Aah well. |
| 16:49 | < Doctor_Nick> | can anyone help me with a problem with C? |
| 16:49 | <@ToxicFrog> | Probably. |
| 16:49 | <@ToxicFrog> | Don't ask to ask; just ask. |
| 16:50 | < Doctor_Nick> | yeah |
| 16:50 | < Doctor_Nick> | lemme throw this up on my webspace |
| 16:50 | <@ToxicFrog> | We have a paster. |
| 16:50 | <@ToxicFrog> | *pastey. |
| 16:50 | < Doctor_Nick> | i have to nest a few ssh sessions here |
| 16:50 | <@ToxicFrog> | Pastebin, even. |
| 16:52 | < Doctor_Nick> | aaaaaaaa |
| 16:52 | < Doctor_Nick> | oh |
| 16:53 | < Doctor_Nick> | i thought I deleted the whole thing for a sec there :/ |
| 16:53 | < Doctor_Nick> | oookay: http://doctornick.dreamhosters.com/opsys/observer.c |
| 16:54 | < Doctor_Nick> | this program just parses through /proc and spits out the values for some system variable, basically |
| 16:55 | <@ToxicFrog> | C is the wrong language for this, but ok |
| 16:55 | < Doctor_Nick> | Trust me, I didnt have a choice |
| 16:55 | < Doctor_Nick> | I certainly didnt WANT to use C :P |
| 16:56 | <@ToxicFrog> | Aah. Why does it have to be C? |
| 16:56 | < Doctor_Nick> | because that's what everyone knows how to use and that's what the TA knows |
| 16:56 | <@ToxicFrog> | Oh. |
| 16:56 | <@ToxicFrog> | Thrash the TA soundly, if learning new languages is such a hardship for him he shouldn't be in CS~ |
| 16:57 | < GeekSoldier|work> | hear hear! |
| 16:57 | <@ToxicFrog> | Anyways. What's the problem? |
| 16:57 | < Doctor_Nick> | i think the logic behind it is that we have to learn enough C later on for some kernal programming, so we might as well learn it now |
| 16:57 | < Doctor_Nick> | anywayyyy |
| 16:57 | < Doctor_Nick> | the problem is, if I nest some of those function calls inside another function, or if I put the program to sleep and then call a function, I get seg faults |
| 16:57 | | GeekSoldier|work is now known as GeekSoldier |
| 16:57 | < Doctor_Nick> | (by function, i mean my user defined functions i have written in thar) |
| 16:57 | <@ToxicFrog> | What does the stack trace look like? |
| 16:58 | <@ToxicFrog> | And what line does it fault on? |
| 16:58 | < Doctor_Nick> | something to do with get |
| 16:58 | < Doctor_Nick> | lemme double check |
| 16:58 | <@ToxicFrog> | ...and, for that matter, are you using gdb for this or are you just eyeballing it? |
| 16:59 | < Doctor_Nick> | gdb |
| 16:59 | < Doctor_Nick> | the segfault is at fgets() |
| 17:00 | <@ToxicFrog> | Which doesn't really confer any useful information; walk back up the stack and find out what called it and with what arguments. |
| 17:01 | < Doctor_Nick> | http://pastebin.com/m1223805c |
| 17:01 | < Doctor_Nick> | print_uptime() is a function I call after I call "sleep(1)" |
| 17:02 | < Doctor_Nick> | i can call print_uptime() before sleep(1) and it will run fine, though |
| 17:02 | <@ToxicFrog> | ... |
| 17:02 | <@ToxicFrog> | Ok, concerning lineBuf... |
| 17:02 | <@ToxicFrog> | Do you ever actually allocate space for it? |
| 17:03 | < Doctor_Nick> | oh. |
| 17:03 | <@ToxicFrog> | Because, er, as far as I can tell you're just declaring it and praying it doesn't point somewhere dangerous. |
| 17:03 | < Doctor_Nick> | yeah... |
| 17:03 | <@ToxicFrog> | Either malloc() space for it, or declare a static buffer. |
| 17:03 | < Doctor_Nick> | ok |
| 17:03 | <@ToxicFrog> | (a static global buffer, even, so you aren't constantly growing and shrinking it on the stack) |
| 17:04 | <@ToxicFrog> | Also, when I said "walk back up the stack and find out what called it and with what arguments", that is in fact what I meant, not "print a stack trace" |
| 17:04 | <@ToxicFrog> | Ie, something like: |
| 17:04 | <@ToxicFrog> | ) level 4 |
| 17:04 | < Doctor_Nick> | how do you do that |
| 17:04 | <@ToxicFrog> | ) print lineBuf |
| 17:04 | < Doctor_Nick> | i was just using "bt" |
| 17:04 | <@ToxicFrog> | ) print thisProcFile |
| 17:05 | <@ToxicFrog> | ) print LB_SIZE+1 |
| 17:05 | <@ToxicFrog> | Use "level X" (or "up" and "down") to move around in the stack, and "print EXPR" to display stuff |
| 17:06 | < Doctor_Nick> | it says it doesnt understand "level" |
| 17:06 | <@ToxicFrog> | Note that expr can be extremely complicated; stuff like "print (struct foo *)(buffer)->bar" is legal. |
| 17:06 | <@ToxicFrog> | Er. "frame X" |
| 17:06 | <@ToxicFrog> | Sorry. |
| 17:06 | <@ToxicFrog> | Also: LB_SIZE+1 is not right. |
| 17:07 | <@ToxicFrog> | Just use LB_SIZE. |
| 17:07 | < Doctor_Nick> | how large can a line buffer be? |
| 17:07 | <@ToxicFrog> | ....as large as you make it. |
| 17:07 | <@ToxicFrog> | Stuff in /proc can sometimes have pretty long lines, so I'd make mine a static 2k buffer or thereabouts: |
| 17:07 | <@ToxicFrog> | // at global scope |
| 17:07 | <@ToxicFrog> | #define BUFSIZE 2048 |
| 17:07 | <@ToxicFrog> | static char buffer[BUFSIZE]; |
| 17:08 | <@ToxicFrog> | // in some function |
| 17:08 | < Doctor_Nick> | where does c dump global variable? |
| 17:08 | < Doctor_Nick> | variables* |
| 17:08 | <@ToxicFrog> | fgets(buffer, BUFSIZE, handle); |
| 17:08 | <@ToxicFrog> | In the .data or .bss segments of the executable. |
| 17:08 | <@ToxicFrog> | Ie, in main memory, preallocated when the program is loaded. |
| 17:09 | <@ToxicFrog> | Local variables are allocated on the stack (so be careful) and malloc'd space goes on the heap. |
| 17:09 | < Doctor_Nick> | i think the main problem is that after i sleep(), the stack pointer goes all kacky-wompus |
| 17:10 | <@ToxicFrog> | Well, remember, fgets() is writing god knows where. |
| 17:10 | <@ToxicFrog> | It's probably trashing the stack, or the malloc accounting information, or more likely both. |
| 17:10 | <@ToxicFrog> | Fix that, and then see if you still have problems. |
| 17:10 | < Doctor_Nick> | yah |
| 17:14 | <@ToxicFrog> | Also, checking the return value of thisProcFile might be wise :P |
| 17:14 | <@ToxicFrog> | Err, of fopen() |
| 17:15 | < Doctor_Nick> | yeah, i should probably check that |
| 17:22 | < Doctor_Nick> | ToxicFrog: it throws compiler warnings at me when I do a global static array |
| 17:22 | < Doctor_Nick> | observer.c:180: warning: passing arg 1 of `fgets' from incompatible pointer type |
| 17:22 | < Doctor_Nick> | and so on |
| 17:24 | < Doctor_Nick> | oh wait |
| 17:24 | < Doctor_Nick> | im dumb |
| 17:24 | < Doctor_Nick> | nvm :B |
| 17:25 | < Doctor_Nick> | woop |
| 17:25 | < Doctor_Nick> | yeah |
| 17:25 | < Doctor_Nick> | it was the pointers |
| 17:26 | < Doctor_Nick> | thanks for the assist |
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| 18:36 | <@ToxicFrog> | No problem. |
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| 21:12 | <@McMartin> | In other news, I have learned to use the Python distutils. |
| 21:12 | <@McMartin> | Now to work out how to make it change defaults, and to make a standalone install.sh that invokes it appropriately |
| 21:12 | <@McMartin> | Since I suspect people will bitch and moan about having to type "python setup.py install" themselves =P |
| 21:22 | < MinceR> | why not just put a shebang line on setup.py? |
| 21:22 | < MinceR> | maybe ./setup.py install works already |
| 21:22 | <@McMartin> | But they're being made to type something that isn't ./configure; make; make install and this gives many people the vapors. |
| 21:22 | <@ToxicFrog> | configure: |
| 21:22 | <@ToxicFrog> | #!/bin/sh |
| 21:23 | <@McMartin> | (And also because as stated it tends to stuff it into /usr/bin, which I don't want. |
| 21:23 | <@McMartin> | ) |
| 21:23 | <@McMartin> | I need to learn how to package documentation and how to change the default prefix. |
| 21:23 | <@ToxicFrog> | echo "Wrong build system. Try 'python setup.py install' instead." |
| 21:23 | < MinceR> | echo Configure complete. Now go run "python setup.py install". |
| 21:23 | <@ToxicFrog> | exit 1 |
| 21:23 | < MinceR> | :) |
| 21:23 | <@ToxicFrog> | Don't forget the exit 1! Otherwise "configure && make" won't short circuit :P |
| 21:24 | < MinceR> | :) |
| 21:24 | <@McMartin> | If they use semicolons it's non-shortcircuitable~ |
| 21:24 | <@ToxicFrog> | If they're using semicolons they don't deserve our pity~ |
| 21:24 | < MinceR> | or if you really want it to be hackish, write a makefile that runs that stuff on make install :> |
| 21:24 | < MinceR> | and exit 0 before it |
| 21:27 | <@McMartin> | Well, distutils can do all kinds of wacky stuff |
| 21:28 | <@McMartin> | And in fact will be where I check the dependencies, when I apply it to Blorple, I think. |
| 21:28 | <@McMartin> | http://blorple.sf.net/ |
| 21:28 | <@McMartin> | Uses a homebrew install script right now, and that doesn't really work if your python or your env are in the wrong places |
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| --- Log closed Tue Sep 25 00:00:40 2007 |