linux-kernel - [PATCH] man ptrace: add extended description of various ptrace quirks

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Date:	Thu, 21 Jul 2011 13:09:56 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	mtk.manpages@...il.com, Oleg Nesterov <oleg@...hat.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH] man ptrace: add extended description of various ptrace quirks

Hi Michael,

Please apply attached patch which updates ptrace manpage.
(I'm not sending it inline, google web mail might mangle it. Sorry).

Changes include:

s/parent/tracer/g, s/child/tracee/g - ptrace interface now
is sufficiently cleaned up to not treat tracing process as parent.

Deleted several outright false statements:
- pid 1 can be traced
- tracer is not shown as parent in ps output
- PTRACE_ATTACH is not "the same behavior as if tracee had done
  a PTRACE_TRACEME": PTRACE_ATTACH delivers a SIGSTOP.
- SIGSTOP _can_ be injected.
- Removed mentions of SunOS and Solaris as irrelevant.
- Added a few more known bugs.

Added a large block of text in DESCRIPTION which doesn't focus
on mechanical description of each flag and operation, but rather
tries to describe a bigger picture. The targeted audience is
a person which is reasonably knowledgeable in Unix but did not
spend years working with ptrace, and thus may be unaware of its quirks.
This text went through several iterations of review by Oleg Nesterov
and Tejun Heo.
This block of text intentionally uses as little markup as possible,
otherwise future modifications to it will be very hard to make.

-- 
vda

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