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From Sascha Schumann <sas...@schumann.cx>
Subject RE: [PATCH] Support for opening large files
Date Tue, 11 Feb 2003 06:32:20 GMT
> The problem was I was never able to get any consensus (mainly because
> no one cared) on what to do with Linux.  Linux doesn't allow for
> largefiles to be sendfile'd.  (I believe Solaris does.)  Even turning
> on largefile support (via defining _FILE_OFFSET_BITS) causes the
> compilation to fail (sys/sendfile.h has a #error in this case, IIRC).

    Looks like your information are a bit stale :-)

    glibc-2.3 includes sendfile64 supported by default.  It has
    been available since Oct 2002.  Distributors are already
    shipping the new glibc, so it can be considered mainstream by
    now.

    Furthermore, even prior to glibc-2.3, according to David S.
    Miller in [1].

        "[sendfile64] is [an] old hat, and appears in every
        current vendor kernel I am aware of and is in 2.5.x as
        well."

    Additionally, you can use sendfile even in older systems for
    sending the first 2GB of a file.  That should be sufficient
    for the majority of cases.  If sendfile fails (e.g. the fs
    does not support it or you hit the 2GB barrier), you need to
    fall back to alternative methods anyway (such as read/write).

    [1] http://www.uwsg.iu.edu/hypermail/linux/kernel/0210.3/0062.html

    - Sascha

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