From: Sascha Hauer <sha@pengutronix.de>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH] libfile: implement new pread_full
Date: Mon, 28 Mar 2022 10:56:34 +0200 [thread overview]
Message-ID: <20220328085634.GN12181@pengutronix.de> (raw)
In-Reply-To: <20220318144942.498124-1-a.fatoum@pengutronix.de>
On Fri, Mar 18, 2022 at 03:49:42PM +0100, Ahmad Fatoum wrote:
> We already have pwrite_full, add pread_full for symmetry.
>
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> include/libfile.h | 1 +
> lib/libfile.c | 25 +++++++++++++++++++++++++
> 2 files changed, 26 insertions(+)
Applied, thanks
Sascha
>
> diff --git a/include/libfile.h b/include/libfile.h
> index 3c2fe1714dcb..a353ccfa9ea9 100644
> --- a/include/libfile.h
> +++ b/include/libfile.h
> @@ -2,6 +2,7 @@
> #ifndef __LIBFILE_H
> #define __LIBFILE_H
>
> +int pread_full(int fd, void *buf, size_t size, loff_t offset);
> int pwrite_full(int fd, const void *buf, size_t size, loff_t offset);
> int write_full(int fd, const void *buf, size_t size);
> int read_full(int fd, void *buf, size_t size);
> diff --git a/lib/libfile.c b/lib/libfile.c
> index 6b373f05ca72..1f533133c593 100644
> --- a/lib/libfile.c
> +++ b/lib/libfile.c
> @@ -75,6 +75,31 @@ int write_full(int fd, const void *buf, size_t size)
> }
> EXPORT_SYMBOL(write_full);
>
> +/*
> + * pread_full - read to filedescriptor at offset
> + *
> + * Like pread, but this function only returns less bytes than
> + * requested when the end of file is reached.
> + */
> +int pread_full(int fd, void *buf, size_t size, loff_t offset)
> +{
> + size_t insize = size;
> + int now;
> +
> + while (size) {
> + now = pread(fd, buf, size, offset);
> + if (now == 0)
> + break;
> + if (now < 0)
> + return now;
> + size -= now;
> + buf += now;
> + }
> +
> + return insize - size;
> +}
> +EXPORT_SYMBOL(pread_full);
> +
> /*
> * read_full - read from filedescriptor
> *
> --
> 2.30.2
>
>
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
>
--
Pengutronix e.K. | |
Steuerwalder Str. 21 | http://www.pengutronix.de/ |
31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox
prev parent reply other threads:[~2022-03-28 8:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-18 14:49 Ahmad Fatoum
2022-03-28 8:56 ` Sascha Hauer [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220328085634.GN12181@pengutronix.de \
--to=sha@pengutronix.de \
--cc=a.fatoum@pengutronix.de \
--cc=barebox@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox