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Re: [RFA/gdbserver/LynxOS]: Incomplete thread list after --attach
- From: Joel Brobecker <brobecker at adacore dot com>
- To: Pedro Alves <palves at redhat dot com>
- Cc: gdb-patches at sourceware dot org
- Date: Tue, 1 Oct 2013 12:02:00 +0200
- Subject: Re: [RFA/gdbserver/LynxOS]: Incomplete thread list after --attach
- Authentication-results: sourceware.org; auth=none
- References: <1380621039-25204-1-git-send-email-brobecker at adacore dot com> <524A9C9E dot 2040407 at redhat dot com>
> > Unfortunately, as the added comments hints, there appears to be
> > no way of getting the list of threads via ptrace, other than by
> > spawning the "ps" command, and parsing its output. Not great,
> > but it appears to be the best we can do. This method was actually
> > inspired by looking at old code which did exactly that.
>
> Huh. I didn't really look at the patch yet, but, then, how
> does "ps" manage to work? If you strace "ps", what system calls
> is it using? I'd imagine if not ptrace, then it would be reading
> /proc or some such?
I can look. But what strongly detered me from doing that is the fact
that it'd be starting to use unpublished interfaces. Running "ps"
isn't pretty, but I can hope it'll keep working across versions of
Lynx (we tested against Lynx 178 and 5.x, knowing that this has worked
with 4.x as well).
--
Joel