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X-HELO: calimero.vinschen.de
Date: Mon, 8 Jun 2015 17:43:34 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: More details about the tmux 2.0 regression
Message-ID: <20150608154334.GA13266@calimero.vinschen.de>
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On Jun  8 18:25, =C4=B0smail D=C3=B6nmez wrote:
> On Mon, Jun 8, 2015 at 6:12 PM, =C4=B0smail D=C3=B6nmez <ismail AT donmez DOT ws=
> wrote:
> > On Mon, Jun 8, 2015 at 4:21 PM, Corinna Vinschen
> > <corinna-cygwin AT cygwin DOT com> wrote:
> >> On Jun  8 14:41, Corinna Vinschen wrote:
> >>> On Jun  6 12:58, =C4=B0smail D=C3=B6nmez wrote:
> >>> > Hi,
> >>> >
> >>> > I had a nice discussion with tmux maintainers over at
> >>> > https://github.com/tmux/tmux/issues/13 about the tmux 2.0 regression
> >>> > on Cygwin.
> >>> >
> >>> > Long story short, tmux is trying to read /proc/<pid>/cmdline and
> >>> > /proc/<pid>/cwd for various reasons and for non-Cygwin programs this
> >>> > is quite slow. You can reproduce this easily run cmd.exe inside bash
> >>> > and try to
> >>> >
> >>> > cat /proc/<pid of cmd.exe>/cmdline
> >>>
> >>> Good catch!
> >>>
> >>> The problem here was that this functionality is very Cygwin centric. =
 It
> >>> tries to call into the process itself to fetch the information.
> >>>
> >>> E.g, assuming you have some /proc/1234, it tries to fetch the informa=
tion
> >>> by sending a request to process 1234 and then waits for that process
> >>> setting a semaphore.  A non-Cygwin process will obviously fail to do =
so,
> >>> not knowing about the method at all.
> >>>
> >>> I fixed that in the Cygwin git repo and it seems to work much better =
now
> >>> to run native tools inside tmux with this change.
> >>>
> >>> I'll upload a developer snapshot on https://cygwin.com/snapshots/ lat=
er
> >>> today.
> >>
> >> Snapshot is up.
> >
> > That resolves the problem for me, cheers!

Thanks for testing.

> One question though, would it be possible to return executable name
> instead of <defunct> for non-Cygwin processes?

That should work, it just needs implementing.

However, I'm just mulling over another idea.  It's probably even
possible to return the comand line and cwd, as long as the calling
process (cat) has permission to open a handle to the requested process.
I'll toy around with this a bit...


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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