Re: intercepting system calls

From: David Wagner (dawat_private)
Date: Fri Apr 13 2001 - 15:45:04 PDT

  • Next message: David Wagner: "Re: intercepting system calls"

    Greg KH  wrote:
    >On Fri, Apr 13, 2001 at 12:59:52AM +0000, David Wagner wrote:
    >> >Quick answer:  processes share file
    >> >descriptors, so you also have to mediate read and write.
    >> 
    >> I'm sorry, could you explain further?  I didn't follow.
    >
    >A program gets a file descriptor and then forks().  The child process
    >uses then uses the file descriptor created by the parent.
    
    What's the problem?
    
    Could you give me a concrete example of a policy where this matters?
    If we have to go to some lengths to support mediating read and write,
    do you think this is justified?  I could be convinced, but on what I've
    seen so far, I'm skeptical.
    
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