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From: Jan Kratochvil <jan.kratochvil@redhat.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>,
	Project Archer <archer@sourceware.org>
Subject: Re: ptrace improvement: PTRACE_O_INHERIT
Date: Sun, 20 Feb 2011 08:18:00 -0000	[thread overview]
Message-ID: <20110220081758.GA7524@host1.dyn.jankratochvil.net> (raw)
In-Reply-To: <20110219202921.GA12280@redhat.com>

On Sat, 19 Feb 2011 21:29:21 +0100, Oleg Nesterov wrote:
> Cough. I still can't understand why gdb needs tkill(TID, 0). Please
> ignore, I know nothing about gdb implementation.
> 
> However. With or without PTRACE_O_TRACEEXIT, the thread can't go away
> until ptracer does do_wait(WEXITED). And until it does do_wait() tkill()
> succeeds even if the tracee is dead/zombie.

Maybe:
          /* The thread has previously exited.  We need to delete it
             now because, for some vendor 2.4 kernels with NPTL
             support backported, there won't be an exit event unless
             it is the main thread.  2.6 kernels will report an exit
             event for each thread that exits, as expected.  */

There probably was a reason why it was once implemented.  Unfortunately GDB is
in use also on embedded targets with obsolete and patched Linux kernels so it
is not welcome to remove such code.


Thanks,
Jan

  reply	other threads:[~2011-02-20  8:18 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-03 22:39 ptrace improvement ideas Roland McGrath
2011-02-04 18:56 ` Oleg Nesterov
2011-02-04 18:58   ` Roland McGrath
2011-02-07 21:11 ` Jan Kratochvil
2011-02-08  1:58   ` Roland McGrath
2011-02-08 20:41     ` Jan Kratochvil
2011-02-09  2:48       ` Roland McGrath
2011-02-08 21:07     ` Oleg Nesterov
2011-02-08 23:18       ` hw_breakpoint userland interface Roland McGrath
2011-02-10 21:03         ` Oleg Nesterov
2011-02-10 21:14           ` Roland McGrath
2011-02-11 20:17             ` Oleg Nesterov
2011-02-10 20:00 ` ptrace improvement: PTRACE_O_INHERIT Oleg Nesterov
2011-02-11 19:24   ` Roland McGrath
2011-02-11 20:46     ` Oleg Nesterov
2011-02-12  0:59       ` Roland McGrath
2011-02-12 19:11         ` Oleg Nesterov
2011-02-14 19:31           ` Roland McGrath
2011-02-14 19:46             ` Oleg Nesterov
2011-02-15  0:36               ` Roland McGrath
2011-02-15 13:16                 ` Oleg Nesterov
2011-02-15 21:43                   ` Jan Kratochvil
2011-02-15 21:56                     ` Roland McGrath
2011-02-16 19:42                       ` Oleg Nesterov
2011-02-16 19:45                         ` Roland McGrath
2011-02-16 20:09                           ` Oleg Nesterov
2011-02-16 20:16                             ` Roland McGrath
2011-02-19 19:48                             ` Jan Kratochvil
2011-02-19 20:37                               ` Oleg Nesterov
2011-02-20  8:18                                 ` Jan Kratochvil [this message]
2011-02-20 21:05                                   ` Oleg Nesterov
2011-02-21 19:54                                 ` Roland McGrath
2011-02-22 19:39                                   ` Oleg Nesterov
2011-02-22 20:49                                     ` Roland McGrath
2011-02-22 21:10                                       ` Oleg Nesterov
2011-02-22 22:16                                         ` Roland McGrath
2011-02-21 19:44                               ` Roland McGrath
2011-02-15 22:02                     ` Roland McGrath
2011-02-16 16:02                       ` Jan Kratochvil
2011-02-16 18:28                         ` Roland McGrath
2011-02-16 20:00                           ` Oleg Nesterov
2011-02-16 20:07                             ` Roland McGrath
2011-02-16 20:32                               ` Oleg Nesterov
2011-02-16 19:48                       ` Oleg Nesterov
2011-02-16 20:02                         ` Roland McGrath
2011-02-16 20:15                           ` Oleg Nesterov
2011-02-16 20:31                             ` Roland McGrath
2011-02-16 21:04                               ` Oleg Nesterov
2011-02-16 21:51                                 ` Roland McGrath
2011-02-16 19:38                     ` Oleg Nesterov
2011-02-16 19:40                       ` Roland McGrath
2011-02-15 22:17                   ` Roland McGrath
2011-02-16 20:48                     ` Oleg Nesterov
2011-02-16 11:31 ` ptrace improvement ideas (QPassSignals) Jan Kratochvil
2011-02-16 18:36   ` Roland McGrath
2011-02-16 20:21     ` Oleg Nesterov
2011-02-18 20:24       ` Oleg Nesterov

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