Re: How does solib handline shared library unloads?

[Christopher Faylor <me@cgf.cx>]

On Tue, Nov 01, 2005 at 07:58:35AM +0100, Mark Kettenis wrote:
>> Date: Tue, 1 Nov 2005 00:39:34 -0500
>> From: Christopher Faylor
>> 
>> Can anyone enlighten me as to how information about a library is
>> relinquished when a library loaded via dlopen is unloaded via dlclose?
>> Theoretically, the information about the library should be removed and
>> the library should not be listed by "info sharedlibrary".
>> 
>> I don't see any way for this to be handled in solib.c and inf*.c but I'm
>> sure I'm just missing something obvious.  I haven't written a test case
>> yet to see how it is being handled but I was hoping someone could
>> clarify this for me.
>
>It happens as part of solib_add(), which should be called for every
>shared library events, not just dlopen()s.  See the code in
>update_solib_list() for the code that actually removes libraries from
>GDB's internal list.

Is this handled as part of the so breakpoint stuff?  I was trying to
avoid implementing that but I will if I have to.

>That said, I think I have convinced myself in the past that there is a
>big gaping memory leak.

I was wondering about that.  I thought there might be a big memory leak
there since it doesn't look like objfile's are being freed.

cgf