linux-kernel - Is prctl(PR_SET_CHILD_SUBREAPER) going to break my code which checks getppid == 1?

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Message-Id: <46799FA3-D575-4A2D-8DEB-CE5149A4110D@ci.uchicago.edu>
Date:	Thu, 29 Mar 2012 15:12:07 -0500
From:	Karl Pickett <kjp@...uchicago.edu>
To:	linux-kernel@...r.kernel.org
Cc:	kay.sievers@...y.org, Oleg Nesterov <oleg@...hat.com>,
	Lennart Poettering <lennart@...ttering.net>
Subject: Is prctl(PR_SET_CHILD_SUBREAPER) going to break my code which checks getppid == 1?

Re: http://thread.gmane.org/gmane.linux.kernel/1236479

I'm wondering if this is going to break code that checks getppid() == 1?

I have a TCL/TK GUI app that spawns ssh.  I want the ssh to die immediately if the GUI process crashes, so ssh is launched with a wrapper c program that does:

   prctl(PR_SET_PDEATHSIG, SIGHUP);
   if (getppid() == 1) /* parent died already? */
       return 0;

So what is getppid() going to return for some user using this new 'session manager reaper'?  How else am I supposed to do proper processes supervision (with TCL/TK as a parent...)?  Also, this program is open source but we distribute binaries that work on as many platforms as possible... we find most users don't want to compile things.

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