netdev - Re: [RFC 1/2] net: Introduce recvmmsg socket syscall

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Message-Id: <200905221022.48790.remi.denis-courmont@nokia.com>
Date:	Fri, 22 May 2009 10:22:48 +0300
From:	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
To:	ext Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Chris Van Hoof <vanhoof@...hat.com>,
	Clark Williams <williams@...hat.com>
Subject: Re: [RFC 1/2] net: Introduce recvmmsg socket syscall

On Thursday 21 May 2009 02:06:52 ext Arnaldo Carvalho de Melo wrote:
> +       /*
> +        * We may return less entries than requested (vlen) if the
> +        * sock is non block and there aren't enough datagrams.
> +        */
> +       if (err == 0 || (err == -EAGAIN && (flags & MSG_DONTWAIT)))
> +               return datagrams;
>         return err;
>  }

Could there be a situation whereby we receive one or more datagrams, then get 
an error? How does userland get the datagrams then?

-- 
Rémi Denis-Courmont
Nokia Devices R&D, Maemo Software, Helsinki

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