Re: Child Process Monitor for intercepting File IO
From: Andrew Bonello (andrew_bonello_at_hotmail.com)
Date: 06/01/03
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- In reply to: Kurtis D. Rader: "Re: Child Process Monitor for intercepting File IO"
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Date: 31 May 2003 22:53:31 -0700
"Kurtis D. Rader" <krader@skepticism.us> wrote in message news:<pan.2003.05.31.22.47.20.363349@skepticism.us>...
> You'll need to tell us the OS you're working with as there is no widely
> implemented mechanism for achieving your goal. On many implementations
> what you're trying to do is going to be impossible.
>
> Are the programs you're trying to control are dynamically linked and
> does your OS support the LD_PRELOAD environment variable? If so you
> might be able to use that to override functions in the standard shared
> libraries (e.g., replace the standard write(2) function with your own
> version). See if your system has a man page named ld.so or something
> similar that documents the dynamic linker/loader for your system.
>
> If that doesn't pan out you could try using the debugging facilities of
> your system. On many implementations this is the ptrace(2) API. However,
> that is probably going to have undesirable performance implications.
> Futhermore, it will be extremely difficult to implement such that all
> boundary conditions are handled correctly.
>
> If your OS supports the concept of nested file systems or file system
> translation layers arguably the best solution is to write a kernel file
> system to implement the desired behavior.
The utilities which the wrapper needs to provide the translation layer
for are running principally under Linux (Redhat 7.2+). I also have
some utilities running under Irix4.?, but these are less of a
priority; its the Linux tools I am mainly interested in providing for.
Do you happen to know if any of your suggested courses of action above
apply in the case of Linux?
Andy
- Previous message: one2001boy_at_yahoo.com: "Re: dlopen() problem"
- In reply to: Kurtis D. Rader: "Re: Child Process Monitor for intercepting File IO"
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