linux-kernel - Re: [PATCH 2/4] uml: helper.c warning corrections

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Message-Id: <201107051142.39733.richard@nod.at>
Date:	Tue, 5 Jul 2011 11:42:39 +0200
From:	Richard Weinberger <richard@....at>
To:	vitalivanov@...il.com
Cc:	Jeff Dike <jdike@...toit.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] uml: helper.c warning corrections

Am Dienstag 05 Juli 2011, 01:15:47 schrieb Vitaliy Ivanov:
> From 7296c5b9770e95cd6ad4e9e71d2d14c972abdfe1 Mon Sep 17 00:00:00 2001
> From: Vitaliy Ivanov <vitalivanov@...il.com>
> Date: Tue, 5 Jul 2011 02:03:06 +0300
> Subject: [PATCH 2/4] uml: helper.c warning corrections
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
> 
> arch/um/os-Linux/helper.c: In function ‘helper_child’:
> arch/um/os-Linux/helper.c:38:7: warning: ignoring return value of ‘write’,
> declared with attribute warn_unused_result

Same question as before...

> Signed-off-by: Vitaliy Ivanov <vitalivanov@...il.com>
> ---
>  arch/um/os-Linux/helper.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c
> index b6b1096..feff22d 100644
> --- a/arch/um/os-Linux/helper.c
> +++ b/arch/um/os-Linux/helper.c
> @@ -28,14 +28,14 @@ static int helper_child(void *arg)
>  {
>  	struct helper_data *data = arg;
>  	char **argv = data->argv;
> -	int err;
> +	int err, ret;
> 
>  	if (data->pre_exec != NULL)
>  		(*data->pre_exec)(data->pre_data);
>  	err = execvp_noalloc(data->buf, argv[0], argv);
> 
>  	/* If the exec succeeds, we don't get here */
> -	write(data->fd, &err, sizeof(err));
> +	CATCH_EINTR(ret = write(data->fd, &err, sizeof(err)));

Is there really a realistic chance that this write() can be interrupted?
helper_child() gets called via clone() in run_helper().

Thanks,
//richard
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