Re: /proc//maps API addition - seek to address

John Richard Moser
2005-01-17T05:29:18Z

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Jeremy Fitzhardinge wrote:
> It would be terribly useful to have some way of
> lseeking /proc/<pid>/maps to the entry of a particular address. So, if
> you want to find the information about a mapping containing address
> 0x12345678, it would set the file position to (say) the entry of
> 0x12000000-0x20000000.
>
> I haven't looked at how /proc/<pid>/maps is implemented these days; is
> this outright hard, or relatively straightforward? This wouldn't be
> very useful if it had to actually generate all the output up to the
> desired point, but it would be a boon if it could short-circuit that. I
> guess the interactions with normal lseek might be tricky (but perhaps
> that could be put off until you actually use lseek, if ever).
>

I'm fairly certain you can just return that the seek is done, and set
flags for the file descriptor, then on read() have it return the data
you want it to.

> Alternatively, any other API for finding the properties of page X would
> be useful, but this seemed like a nice incremental extension of the
> existing interface.
>
> J
>
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