Re: Extracting symbol info out of processes at runtime

From: Eric Jacobs (eaja_at_erols.com)
Date: 04/30/04

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    Date: Thu, 29 Apr 2004 19:37:06 -0400
To: freebsd-hackers@freebsd.org

    On Thu, 29 Apr 2004 14:51:47 +0200
    "P. de Boer" <pieter@thelostparadise.com> wrote:

    >
    > On Thu, 2004-04-29 at 14:30, Dag-Erling Smørgrav wrote:
    > > "P. de Boer" <pieter@thelostparadise.com> writes:
    > > > For a little private project I'm working at, I need to find the address
    > > > of a function which is inside a shared library of a running process, OR
    > > > the base address the library is running at
    > >
    > > man dlinfo
    >
    > Well, yes, dlinfo() would be very useful, if it was not for my wish to
    > read the link_map from another proces, using ptrace(). I've looked at
    > rtld-elf.c, to see what dlinfo() does: it finds the object by the given
    > address and then 'returns' the link_map for that object. However, I
    > can't find out where this info would be in the memory image of a running
    > process.

    Have a look at /proc/NNN/map
    (If trying to read it gives you "File too large", try it with a bigger
    buffer size.) The segment load address is in the leftmost column.

    Eric
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