Re: sendfile(2) SF_NOPUSH flag proposal

From: Igor Sysoev (is_at_rambler-co.ru)
Date: 05/29/03

  • Next message: Terry Lambert: "Re: sendfile(2) SF_NOPUSH flag proposal" 
    Date: Thu, 29 May 2003 09:22:54 +0400 (MSD)
To: Terry Lambert <tlambert2@mindspring.com>

    On Wed, 28 May 2003, Terry Lambert wrote:

    > Bill Fenner wrote:
    > > Why not set PRUS_MORETOCOME on all but the final pru_send() call?
    >
    > If the file is larger than `sysctl net.inet.tcp.sendspace`, then
    > this code in do_sendfile():
    >
    > if (sbspace(&so->so_snd) < so->so_snd.sb_lowat) {
    > if (so->so_state & SS_NBIO) {
    > m_freem(m);
    > sbunlock(&so->so_snd);
    > splx(s);
    > error = EAGAIN;
    > goto done;
    > }
    > error = sbwait(&so->so_snd);
    >
    > will result in you sleeping with PRUS_MORETOCOME set, but with
    > no more being sent because the send buffer doesn't get emptied,
    > as it's waiting for more data to send.

    But as I understand PRUS_MORETOCOME is not set if socket is non-blocking.

    Igor Sysoev
    http://sysoev.ru/en/

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