On Sat, 18 Jan 1997, Dave wrote: > Hey, it's the "original poster." I, of course, have the account password. I > was just thinking that if I could set up a shell command it would only shell > to certain places: > i.e. perhaps builders would get their own dir, and that would be all they > could access, and imps get more access, but not all, etc. etc. > Would this system lag badly? You would, as posted before, need to create a link between a socket and pseudo-terminals, which is not the easiest code to write, but is the only non-blocking method I'm familiar with. Calling the 'system' command is bad, because it blocks all pending input/output, thus making it look like the MUD is lagged for as long as the system command is executing (and when you're using a shell, that could be a long time). Anyway, if you use the method suggested previously (spawning children and having them route input and output to your parent and grand-child), you will probably get some lag, although that really depends upon how nice of a machine you have. Since fork'ing off child processes creates duplicates of the parent (and thus using the same amount of memory), it's likely that three processes on a system with only 4mb of RAM will cause swapping... Of course, it also depends upon how much memory the parent is truly using. My MUD used ~3mb with code, world files, player files, etc. (after optimization), therefore I need a machine with at least 12mb to fork off the three processes and still leave room for whatever else I want to do. Don't take me for accuracy in this area... I just woke up. -- Daniel Koepke dkoepke@california.com Forgive me father, for I am sin. +-----------------------------------------------------------+ | Ensure that you have read the CircleMUD Mailing List FAQ: | | http://cspo.queensu.ca/~fletcher/Circle/list_faq.html | +-----------------------------------------------------------+
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