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From: Theodore Ts'o <tytso-3s7WtUTddSA@public.gmane.org>
To: Mathieu Desnoyers
	<mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
Cc: "Richard W.M. Jones"
	<rjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
	mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
	Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
	zab <zab-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	emunson-JqFfY2XvxFXQT0dZR+AlfA@public.gmane.org,
	"Paul E. McKenney"
	<paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
	Andrea Arcangeli
	<aarcange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org,
	Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
	sfr-3FnU+UHB4dNDw9hX6IcOSA@public.gmane.org,
	Milosz Tanski <milosz-B5zB6C1i6pkAvxtiuMwx3w@public.gmane.org>,
	rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
	arnd-r2nGTMty4D4@public.gmane.org,
	ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org,
	gorcunov <gorcunov-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>,
	iulia manda21
	<iulia.manda21-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	dave hansen <dave.hansen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
	mguzik <mguzik-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	adobriyan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	Davidlohr Bueso <dave-h16yJtLeMjHk1uMJSBkQmQ@public.gmane.org>,
	linux-api <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	gorcunov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	fw-d32yF4oPJVt0XxTmqZlbVQ@public.gmane.org,
	Linus Torvalds <torvalds@linux-found>
Subject: Re: [PATCH v2 0/2] vfs: Define new syscall getumask.
Date: Wed, 13 Apr 2016 22:13:48 -0400	[thread overview]
Message-ID: <20160414021348.GB16656@thunk.org> (raw)
In-Reply-To: <1736004700.56566.1460581285951.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>

On Wed, Apr 13, 2016 at 09:01:25PM +0000, Mathieu Desnoyers wrote:
> I'm actually discussing 3 separate things here: the umask, sigmask, and
> cpu affinity mask.

The last two are available in /proc/<pid>/status --- which brings up
the question why not just add umask to /proc/<pid>/status?

That way the shared library can read it via /proc/self/status, but
this way it would be possible to look at other process's umask values
this as well.

> >> Another approach to this has been attempted before, adding something
> >> to /proc, although it didn't go anywhere.  See:
> >> 
> >>  http://comments.gmane.org/gmane.linux.kernel/1292109

... and indeed that's what I suggested.  It looks like from the thread
that it petered out due to apathy instead of people not liking the
idea.

One other reason to suggest using a /proc file is that you're not at
the mercy of the glibc folks to wire up a new system call.  (Glibc has
been refusing to wire up getrandom(2), for example.   Grrrr.....)

     	      	      	 	       	   	      - Ted

  parent reply	other threads:[~2016-04-14  2:13 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-13 12:57 [PATCH v2 0/2] vfs: Define new syscall getumask Richard W.M. Jones
2016-04-13 12:57 ` [PATCH v2 1/2] " Richard W.M. Jones
     [not found]   ` <1460552272-15985-2-git-send-email-rjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-13 13:20     ` Cyrill Gorcunov
2016-04-13 13:57       ` Richard W.M. Jones
     [not found]         ` <20160413135708.GG11600-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-13 14:02           ` Christoph Hellwig
2016-04-13 15:27           ` Mathieu Desnoyers
     [not found] ` <1460552272-15985-1-git-send-email-rjones-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-13 12:57   ` [PATCH v2 2/2] x86: Wire up new getumask system call on x86 Richard W.M. Jones
2016-04-13 13:59   ` [PATCH v2 0/2] vfs: Define new syscall getumask Greg KH
2016-04-14  3:47     ` Steven Rostedt
2016-04-14 19:26       ` Greg KH
2016-04-13 15:39   ` Mathieu Desnoyers
     [not found]     ` <2143735451.55767.1460561962122.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-04-13 21:01       ` Mathieu Desnoyers
     [not found]         ` <1736004700.56566.1460581285951.JavaMail.zimbra-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org>
2016-04-14  2:13           ` Theodore Ts'o [this message]
     [not found]             ` <20160414021348.GB16656-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2016-04-18  0:38               ` H. Peter Anvin
     [not found]                 ` <57142C80.6070005-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2016-04-18  1:09                   ` Greg KH
     [not found]                     ` <20160418010925.GA7800-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2016-04-18  2:02                       ` H. Peter Anvin
2016-04-18  2:12                       ` Josh Triplett
2016-04-18  2:15                         ` H. Peter Anvin
2016-04-18  2:37                           ` Josh Triplett
2016-04-18  3:00                             ` H. Peter Anvin
     [not found]                               ` <57144DE6.9050409-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2016-04-18 11:39                                 ` Theodore Ts'o
2016-04-14 17:56           ` Andy Lutomirski
2016-04-13 15:41   ` Colin Walters
     [not found]     ` <1460562105.353100.577697153.013DF466-2RFepEojUI2N1INw9kWLP6GC3tUn3ZHUQQ4Iyu8u01E@public.gmane.org>
2016-04-13 16:03       ` Richard W.M. Jones
2016-04-18  1:42       ` H. Peter Anvin
     [not found]         ` <57143B74.3070302-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2016-04-18  1:57           ` Josh Triplett
2016-04-18  9:14             ` Richard W.M. Jones
2016-04-18 10:04               ` H. Peter Anvin

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