From: Pedro Alves <palves@redhat.com>
To: Joel Brobecker <brobecker@adacore.com>
Cc: gdb-patches@sourceware.org
Subject: Re: [RFA/gdbserver/LynxOS]: Incomplete thread list after --attach
Date: Tue, 01 Oct 2013 09:57:00 -0000 [thread overview]
Message-ID: <524A9C9E.2040407@redhat.com> (raw)
In-Reply-To: <1380621039-25204-1-git-send-email-brobecker@adacore.com>
On 10/01/2013 10:50 AM, Joel Brobecker wrote:
> Hello,
>
> The current implementation is forgetting to populate the thread list
> when attaching to the process. This results in an incomplete list of
> threads when debugging a threaded program.
>
> 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?
--
Pedro Alves
next prev parent reply other threads:[~2013-10-01 9:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-01 9:50 Joel Brobecker
2013-10-01 9:57 ` Pedro Alves [this message]
2013-10-01 10:02 ` Joel Brobecker
2013-10-01 10:16 ` Pedro Alves
2013-10-01 10:52 ` Joel Brobecker
2013-10-01 11:33 ` Pedro Alves
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