Re: [Chicken-users] Dynamic loading foreign C library problem
On Tue, 22 Nov 2005, felix winkelmann wrote: Hi, Matthew! How do you allocate the C string, and how is it passed to Scheme? Ah hah! That was it, no fault with CHICKEN, really, I allocated the string incorrectly. I was doing: AIargs = malloc(sizeof(argstring)); Which was only 4 bytes, because it was doing the size of the pointer, argstring. So I had to do sizeof(strlen(argstring) + 1) instead. Now I fixed that and some other malloc'd things and the game is loading up very well! Thank you for your direction. I like CHICKEN very much so far. Matt PS. On a side question, is there some thing you can do in the csi chicken interpreter to make it so you can press the up arrow and cycle through the history of your commands, like in a bash shell? cheers, felix On 11/22/05, Matthew David Parker [EMAIL PROTECTED] wrote: Hi, I have a game that is compiled as a shared library. It uses X11 and runs in a thread from SDL. So normally I would link to this library and run game_load(args) where args are command line options, like -join 127.0.0.1. calling game_load will start the game in the thread and return control to the program that called game_load. I'm making an AI interface to the game, so after it loads you can call functions like move(32, 4) to get the bot in the game to move, or something similar. I've gotten this to work dynamically linked from a C program, and I got it to work in Chez scheme. I'm now trying to use CHICKEN to do it, since chicken is open source and chez isn't. So, in CHICKEN I have a file xpai.scm that is supposed to interface to my game. Here's a simplified version of what's in it: (foreign-declare #include \game_ai.h\) (define game.load (foreign-lambda void game_load c-string)) I compile it like this: chicken xpai.scm -dynamic gcc -o xpai.so xpai.c `chicken-config -shared -libs -cflags` -lgame_ai -shared -fPIC `sdl-config --libs --cflags` And it compiles fine, into xpai.so Then I run csi and (load xpai.so) which it does fine. Then I run (game_load -join termite.cs.indiana.edu) the game_load function in C mallocs the arg string permanately and AIargs points to it. I can printf AIargs at this point and it's fine. Then, I run SDL_Init, and if I printf AIargs it's just -join termit instead of the full string it once was, as if SDL_Init cut into the memory somehow. I read SDL_Init sometimes causes problems on Mac OS X (even though I'm using linux 2.6.8), so I moved SDL_Init to a spot in the code before I malloc'd AIargs. THe program got a little further this time; it connected to the server, but then there as a segmentation fault, I think while it was trying to load the X window for the game graphics. I could have traced it down to the exact line, but I figure there's just some option in CHICKEN that I need to set so that it can properly handle this. Maybe the problem is that, while chicken properly loads my libgame_ai.so C library, it doesn't properly handle the memory of the dynamic libraries that libgame_ai.so is linked to? Matt ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Dynamic loading foreign C library problem
Try the readline egg at http://www.call-with-current-continuation.org/eggs/readline.html. On 11/22/05, Matthew David Parker [EMAIL PROTECTED] wrote: PS. On a side question, is there some thing you can do in the csi chicken interpreter to make it so you can press the up arrow and cycle through the history of your commands, like in a bash shell? ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Dynamic loading foreign C library problem
On Nov 22, 2005, at 12:04 PM, Matthew David Parker wrote:PS. On a side question, is there some thing you can do in the csi chicken interpreter to make it so you can press the "up" arrow and cycle through the history of your commands, like in a bash shell? If you use emacs with one of the scheme packages such as quack (built on cmuscheme.el and scheme.el) you get command history in csi with meta-p and meta-n.Quack is at http://www.neilvandyke.org/quack/You can do your shell stuff (such as chicken setup) from eshell and never leave emacs.regards Raffael Cavallaro, Ph.D. [EMAIL PROTECTED] ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Dynamic loading foreign C library problem
Am 22.11.2005, 17:04 Uhr, schrieb Matthew David Parker [EMAIL PROTECTED]: [...] So I had to do sizeof(strlen(argstring) + 1) instead. Hello, what is that sizeof operator doing there? It should just be something like malloc(strlen(argstring) + 1) otherwise the value of the expression will also be 4. (But probably this was just a typo in your e-mail, so never mind) [...] PS. On a side question, is there some thing you can do in the csi chicken interpreter to make it so you can press the up arrow and cycle through the history of your commands, like in a bash shell? [...] Emacs and the readline egg have already been suggested. Yet another flexible alternative is the rlwrap program: http://utopia.knoware.nl/~hlub/uck/rlwrap/ cu, Thomas ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Dynamic loading foreign C library problem
On 11/22/05, Zbigniew [EMAIL PROTECTED] wrote: Try the readline egg at http://www.call-with-current-continuation.org/eggs/readline.html. On 11/22/05, Matthew David Parker [EMAIL PROTECTED] wrote: PS. On a side question, is there some thing you can do in the csi chicken interpreter to make it so you can press the up arrow and cycle through the history of your commands, like in a bash shell? Readline would be the thing. A quick and dirty tool for these things is rlwrap. cheers, felix ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Dynamic loading foreign C library problem
Hm... Is there some more information available? When exactly does the segfault occur? cheers, felix On 11/22/05, Matthew David Parker [EMAIL PROTECTED] wrote: Alright, I got the readline egg and it works quite well. Though, when I run the function to load up my game window it throws a segmentation fault. It only does it when I'm using readline, and not otherwise. On Tue, 22 Nov 2005, felix winkelmann wrote: On 11/22/05, Zbigniew [EMAIL PROTECTED] wrote: Try the readline egg at http://www.call-with-current-continuation.org/eggs/readline.html. On 11/22/05, Matthew David Parker [EMAIL PROTECTED] wrote: PS. On a side question, is there some thing you can do in the csi chicken interpreter to make it so you can press the up arrow and cycle through the history of your commands, like in a bash shell? Readline would be the thing. A quick and dirty tool for these things is rlwrap. cheers, felix ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] Dynamic loading foreign C library problem
Hi, Matthew! How do you allocate the C string, and how is it passed to Scheme? cheers, felix On 11/22/05, Matthew David Parker [EMAIL PROTECTED] wrote: Hi, I have a game that is compiled as a shared library. It uses X11 and runs in a thread from SDL. So normally I would link to this library and run game_load(args) where args are command line options, like -join 127.0.0.1. calling game_load will start the game in the thread and return control to the program that called game_load. I'm making an AI interface to the game, so after it loads you can call functions like move(32, 4) to get the bot in the game to move, or something similar. I've gotten this to work dynamically linked from a C program, and I got it to work in Chez scheme. I'm now trying to use CHICKEN to do it, since chicken is open source and chez isn't. So, in CHICKEN I have a file xpai.scm that is supposed to interface to my game. Here's a simplified version of what's in it: (foreign-declare #include \game_ai.h\) (define game.load (foreign-lambda void game_load c-string)) I compile it like this: chicken xpai.scm -dynamic gcc -o xpai.so xpai.c `chicken-config -shared -libs -cflags` -lgame_ai -shared -fPIC `sdl-config --libs --cflags` And it compiles fine, into xpai.so Then I run csi and (load xpai.so) which it does fine. Then I run (game_load -join termite.cs.indiana.edu) the game_load function in C mallocs the arg string permanately and AIargs points to it. I can printf AIargs at this point and it's fine. Then, I run SDL_Init, and if I printf AIargs it's just -join termit instead of the full string it once was, as if SDL_Init cut into the memory somehow. I read SDL_Init sometimes causes problems on Mac OS X (even though I'm using linux 2.6.8), so I moved SDL_Init to a spot in the code before I malloc'd AIargs. THe program got a little further this time; it connected to the server, but then there as a segmentation fault, I think while it was trying to load the X window for the game graphics. I could have traced it down to the exact line, but I figure there's just some option in CHICKEN that I need to set so that it can properly handle this. Maybe the problem is that, while chicken properly loads my libgame_ai.so C library, it doesn't properly handle the memory of the dynamic libraries that libgame_ai.so is linked to? Matt ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
