Date: Thu, 05 Sep 2002 23:05:36 +0100 (BST) From: Duncan Barclay <dmlb@dmlb.org> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: emulation@FreeBSD.org Subject: Re: TIOCSCTTY not implemented in linuxulator? Message-ID: <XFMail.20020905230536.dmlb@computer.my.domain> In-Reply-To: <20020905211340.GA705@athlon.pn.xcllnt.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On 05-Sep-2002 Marcel Moolenaar wrote:
> On Thu, Sep 05, 2002 at 07:40:33PM +0100, Duncan Barclay wrote:
>
>> At this point ps shows
>> PGID PID PPID WCHAN STAT TT TIME COMMAND
>> 6255 6255 5319 wait I+ p1 0:00.93
>> /ide3.g/matlab6p1/bin/glnx86/matlab
>> 6255 6404 6255 - Z+ p1 0:00.00 (matlab)
>> and a kill -9 is needed.
>>
>> Should the wait4 by pid=6255 actually have the WCLONE option set? It is
>> reaping a cloned process.
Erm, sorry this turns out to be a red herring. Have a look at my
later mail. We do not honour the Linux clone(2) signal handling options
fully. Take a look at kern_exit lower down, where it signals the parent.
> I don't think the option is required. Looking in /sys/kern/kern_exit.c
> (-current sources) where we consume the options I see the following test:
>
> if ((p->p_sigparent != SIGCHLD) ^
> ((uap->options & WLINUXCLONE) != 0)) {
> PROC_UNLOCK(p);
> continue;
> }
>
> For -stable sources this is (reformatted):
>
> if ((p->p_sigparent != SIGCHLD) ^
> ((uap->options & WLINUXCLONE) != 0))
> continue;
>
> The equivalent in the Linux kernel is (reformatted):
>
> if (((p->exit_signal != SIGCHLD) ^
> ((options & __WCLONE) != 0))
> && !(options & __WALL))
> continue;
>
> So, we have a __WALL that can make a difference and guess what we don't
> promote in the Linuxulator?
>
> Can you put a printf() in linux_wait4() so that we can see if __WALL
> (defined as 0x40000000) is present or not?
We don't, I've already checked. However, this would not have made
any difference to Matlab in this case.
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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?XFMail.20020905230536.dmlb>