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    SubjectRe: sendfile(2) behaviour has changed ?
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    "David S. Miller" <davem@redhat.com> writes:

    > From: Matti Aarnio <matti.aarnio@zmailer.org>
    > Date: Wed, 16 Oct 2002 12:10:46 +0300
    >
    > On Wed, Oct 16, 2002 at 10:49:08AM +0200, Zilvinas Valinskas wrote:
    > > Is this expected behaviour ? that sendfile(2) on 2.5.4x linux kernel requires
    > > socket as an output fd paramter ?
    >
    > It has only been intended for output to a TCP stream socket.
    >
    > To be honest, I'm not so sure about this.
    >
    > For example, I definitely see us supporting this in the
    > opposite direction when commodity 10gbit hits the market.
    >
    > Initially I thought "sys_receivefile()" but it makes no
    > sense when we have a system call that is perfectly capable
    > of describing the tcp_socket --> page_cache operation.

    It really needs a new interface for recvfile/copyfile/whatever
    anyway, as you can only specify an off_t for the from fd at present.

    Also consider that if you have 2 network sockets you really want a
    way to see which did the EAGAIN.

    Which leads to something like...

    ssize_t copyfddata(int out_fd, off_t *offset,
    int in_fd, off_t *offset, size_t count, int *in_errno);

    ...and another for the off64_t API, the errno thing looks crappy but I
    think creating EREADAGAIN is even worse (and I just know that won't be
    the last if it's done that way) ... unless you can think of another way.

    --
    # James Antill -- james@and.org
    :0:
    * ^From: .*james@and\.org
    /dev/null
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