linux-kernel - Re: [PATCH v4 2/2] efi: an sysfs interface for user to update efi firmware

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Message-ID: <1429669228.2207.46.camel@HansenPartnership.com>
Date:	Tue, 21 Apr 2015 19:20:28 -0700
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Ming Lei <ming.lei@...onical.com>,
	"Ong, Boon Leong" <boon.leong.ong@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] efi: an sysfs interface for user to update efi
 firmware

On Tue, 2015-04-21 at 18:58 -0700, Andy Lutomirski wrote:
> On Tue, Apr 21, 2015 at 6:21 PM, James Bottomley
> <James.Bottomley@...senpartnership.com> wrote:
> > Andy, just on the misc device idea, what about triggering the capsule
> > update from close()?  In theory close returns an error code (not sure if
> > most tools actually check this, though).  That means we can do the write
> > in chunks but pass it in atomically on the close and cat will work
> > (provided it checks the return code of close).
> 
> I thought about this but IIRC cat doesn't check the return value from close.

It does in my copy (coreutils-8.23) :

      if (!STREQ (infile, "-") && close (input_desc) < 0)
        {
          error (0, errno, "%s", infile);
          ok = false;
        }
[...]
  if (have_read_stdin && close (STDIN_FILENO) < 0)
    error (EXIT_FAILURE, errno, _("closing standard input"));


James


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