Date: Thu, 05 Sep 2002 23:12:55 +0100 (BST) From: Duncan Barclay <dmlb@dmlb.org> To: John E Hein <jhein@timing.com> Cc: emulation@FreeBSD.ORG Subject: Re: fix for Linux matlab exit behaviour - problem with linux_clo Message-ID: <XFMail.20020905231255.dmlb@computer.my.domain> In-Reply-To: <15735.51083.489854.267762@brain.timing.com>
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On 05-Sep-2002 John E Hein wrote: > Duncan Barclay wrote at 21:55 +0100 on Sep 5: > > Please review the following PR for a hack to let matlab exit. > > > > http://www.freebsd.org/cgi/query-pr.cgi?pr=42457 > > > > The code in PR is deliberatly not a patch because it is not the right way > > to cleanly fix the problem. > > > > The problem is that we do not fully emulate all of linux_clone(2) > behaviour, > > in particular, linux_clone(2) allows a thread to not send a signal to > > its parent on exit. /sys/kern_exit.c does not allow this and will > > send a specified signal or SIGCHLD. Matlab has a SIGCHLD handler that > > does not reap threads. If the SIGCHLD is not sent, matlab reaps its last > > thread and exits cleanly. > > Interesting... so why then does the /dev/ptmx -> /dev/null hack allow > us to exit matlab? > Hmm, I forgot about that hack. I have no idea! Can you get a ktrace of it exiting please, preferably after unsetting DISPLAY so that X11 is turned off. Turning X11 off means that there is less cruft in the ktrace. Otherwise, I'll take a look tomorrow. Duncan -- ________________________________________________________________________ Duncan Barclay | God smiles upon the little children, dmlb@dmlb.org | the alcoholics, and the permanently stoned. dmlb@freebsd.org| Steven King To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-emulation" in the body of the message
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