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Mail Archives: cygwin-developers/1999/08/25/05:32:31

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Date: Wed, 25 Aug 1999 13:19:59 +0400
From: Egor Duda <deo AT logos-m DOT ru>
X-Mailer: The Bat! (v1.029) S/N A0F2A05A
Reply-To: Egor Duda <deo AT logos-m DOT ru>
Organization: DEO
Message-ID: <9555.990825@logos-m.ru>
To: cygwin-developers <cygwin-developers AT sourceware DOT cygnus DOT com>
Subject: strace attaching to already running process
Mime-Version: 1.0

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Hi!

  I needed some debugging info from ever-running cygwin daemon, so i've
patched strace a bit to allow it to attach to already running process.
Suppling windows pid of process in a form

strace -o <file> -p <winpid>

will do the job. There's two drawbacks, however, both due to features
of DebugActiveProcess API. First -- when strace exits, debugee exits
too. And second -- '-f' option don't work. Working around second
limitation seems possible, but solution i see is quite ugly -- it
suppose that when debugee starts child processes through fork or
spawn, it'll pass DEBUG_PROCESS flag to CreateProcess, and redirect
all children's debug output to actual strace. But it will require that
debugee must stay alive as long as children are running, so, a bunch of
additional syncronization is needed. Anyway, stracing single running
process seems to work ok.

Egor.            mailto:deo AT logos-m DOT ru ICQ 5165414 FidoNet 2:5020/496.19
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