linux-kernel - Re: [PATCH v3 1/1] ioctl-fat.2: new manpage for the ioctl fat API

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Date:	Tue, 3 Feb 2015 10:24:42 +0100
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Heinrich Schuchardt <xypron.glpk@....de>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-man <linux-man@...r.kernel.org>
Subject: Re: [PATCH v3 1/1] ioctl-fat.2: new manpage for the ioctl fat API

Hello Hirofumi,

Thanks for checking the page over.

On 3 February 2015 at 09:51, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> wrote:
> "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com> writes:
>
>> Hello Heinrich and Ogawa,
>
> Hi,
>
>> On 23 January 2015 at 20:54, Heinrich Schuchardt <xypron.glpk@....de> wrote:
>>> The ioctl(2) system call may be used to retrieve information about
>>> the fat file system and to set file attributes.
>>>
>>> This new manpage describes the details.
>>
>> @Ogawa, as the FAT maintainer, might you be willing to review this page?
>
>
>                for (;;) {
>
>                    /*
>                     * Read next directory entry.
>                     */
>                    ret = ioctl( fd, VFAT_IOCTL_READDIR_BOTH, entry);
>
>                    /*
>                     * If an error occurs, the return value is -1.
>                     * If d_reclen is zero, the end of the directory
>                     * list has been reached.
>                     */
>                    if (ret == -1 || entry[0].d_reclen == 0)
>                        break;
>
> Quick reviewed, and looks good. However, entry[0].d_reclen == 0 works as
> backward compatibility though. The example might be good to use usual
> way of getdents().
>
> I.e., "ret" means
>         -1 == error
>         0  == EOD
>         0  >  how many bytes read

Sorry -- I do not really understand what you mean here
"entry[0].d_reclen == 0 works as backward compatibility though"). Is
the line

                    if (ret == -1 || entry[0].d_reclen == 0)

incorrect? If yes, what should the code look like?

Thanks,

Michael

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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