Re: Is sendfile all that sexy?

From: Matti Aarnio (matti.aarnio@zmailer.org)
Date: Mon Jan 15 2001 - 10:36:07 EST


On Mon, Jan 15, 2001 at 03:24:55PM +0000, Jonathan Thackray wrote:
> It's a very useful system call and makes file serving much more
> scalable, and I'm glad that most Un*xes now have support for it
> (Linux, FreeBSD, HP-UX, AIX, Tru64). The next cool feature to add to
> Linux is sendpath(), which does the open() before the sendfile()
> all combined into one system call.

        One thing about 'sendfile' (and likely 'sendpath') is that
        current (hammered into running binaries -> unchangeable)
        syscalls support only up to 2GB files at 32 bit systems.

        Glibc 2.2(9) at RedHat <sys/sendfile.h>:

#ifdef __USE_FILE_OFFSET64
# error "<sendfile.h> cannot be used with _FILE_OFFSET_BITS=64"
#endif

        I do admit that doing sendfile() on some extremely large
        file is unlikely, but still...

> Ugh, I hear you all scream :-)
> Jon.
> --
> Jonathan Thackray Zeus House, Cowley Road, Cambridge CB4 OZT, UK
> Zeus Technology http://www.zeus.com/

/Matti Aarnio
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