linux-proc readlink patch

[Andrew Cagney]

> This patch:
> 
> 2002-01-08  Michael Snyder  <msnyder@redhat.com>
> 
> * linux-proc.c (child_pid_to_exec_file): Use readlink to get the
>         real name of the executable, rather than the /proc name.
> 
> (which I never saw posted on gdb-patches; was that an artifact of the email
> breakage yesterday?)
> 
> seems to have at least one problem.
> 
> (1) It introduces a memory leak, if I understand the semantics of cleanups
> correctly.  make_cleanup's cleanups will only be called (according to the
> comment in utils.c) after a failed command.


Since not looking at the code is current vogue .... :-)

People use cleanups to mimic two exception behavours:

	TRY  ... EXCEPT ... END
		you'll see a discard_cleanups()

	TRY ... ALWAYS ... END
		you'll see a do_cleanups ()

it was probably a forget me.


> (2) It is not, IIRC, always correct in the case of chroots.  Handling for
> this has changed across Linux versions several times.  On 2.2 it seems to be
> correct (to my surprise, actually), but I believe it is not on 2.0.  Do we
> care?  Probably not, as 2.0 is now -very- old.


I don't know if we're really that worried about mimicing old broken 
kernel behavour (at least until we get a real user complaint).

enjoy,
Andrew