linux-kernel - Re: [PATCH v2 0/2] vfs: Define new syscall getumask.

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Message-ID: <57144042.3090009@zytor.com>
Date:	Sun, 17 Apr 2016 19:02:42 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"Richard W.M. Jones" <rjones@...hat.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	mingo@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	luto@...nel.org, viro@...iv.linux.org.uk, zab <zab@...hat.com>,
	emunson@...mai.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>, josh@...htriplett.org,
	Pavel Emelyanov <xemul@...allels.com>, sfr@...b.auug.org.au,
	Milosz Tanski <milosz@...in.com>,
	rostedt <rostedt@...dmis.org>, arnd@...db.de,
	ebiederm@...ssion.com, gorcunov <gorcunov@...nvz.org>,
	iulia manda21 <iulia.manda21@...il.com>,
	dave hansen <dave.hansen@...ux.intel.com>,
	mguzik <mguzik@...hat.com>, adobriyan@...il.com,
	Davidlohr Bueso <dave@...olabs.net>,
	linux-api <linux-api@...r.kernel.org>, gorcunov@...il.com,
	fw@...eb.enyo.de, Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 0/2] vfs: Define new syscall getumask.

On 04/17/16 18:09, Greg KH wrote:
>>
>> There aren't a *lot* of such system calls, but even in that thread the
>> "oh, only two applications need this, let them use syscall(3)" seems to
>> remain.
> 
> And only 2 applications will continue to use it because no one wants to
> write syscall() wrappers for their individual applications, so it's a
> vicious cycle :(
> 
> I really like the 'libinux' idea, did anyone every hack up a first-pass
> at this?  And I'm guessing we have more syscalls now that would need to
> be added (like getrandom(), but that shouldn't be too difficult.
> 

I haven't hacked anything up yet, but I think it would be easy to simply
take the klibc machinery, remove the stuff that isn't needed, and adjust
the handling of errno(3).  I think it is time I admit that it needs to
be put on my TODO list.

	-hpa