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gdbstub initial code, v6

From: Oleg Nesterov <oleg at redhat dot com>
To: archer at sourceware dot org, utrace-devel at redhat dot com
Date: Fri, 27 Aug 2010 21:30:53 +0200
Subject: gdbstub initial code, v6

Changes:

	- adapt to "no more utrace changes". Whatever I think
	  about utrace I have to agree, it is not practical to
	  change utrace now

	- attach to the thread-group with the dead leader

	- fix the double-attaching bug

	- do not assume we can trust pid_task(), the tracee can
	  be reaped even if it can't pass ->report_death()

	- size_t is unsigned! -EAGAIN from ->read() makes this
	  fd unusable from rw_verify_area() pov

Next: report signals.

Attachment: ugdb.c
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