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stupid fork() the waster!!

  • 26-10-2005 4:48pm
    #1
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    hows thing's

    ok here is my issue

    Im doing a course in computer systems and I’m having trouble understanding the fork () system call and was looking to see if anyone could clarify this.

    Ok so for example I am in Linux/UNIX and I type

    cp file1 file2

    Now I don’t quite understand where fork comes into play. I assume somewhere in the OS files there is a program called cp and this program takes a number or args, namely the files it is to compare. But what is fork doing I mean in layman’s terms.

    Could someone if they know, talk about how the computer boots up gets its initial process running then goes about calling fork? I mean in all the OS books they say fork() get called by process A and creates an exact copy of itself [process B the child process] then they go there separate ways. Etc…… OK But what was process A? what did it look like?[ie was it running any programs etc], what was it doing before it called fork. Why do I need to exact process to do the same task? Ahhh this is driving me nuts.

    Any help would be great thanks.


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