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Re: fsyncing directories

by salva (Canon)
on Apr 27, 2010 at 12:18 UTC ( [id://837089]=note: print w/replies, xml ) Need Help??


in reply to fsyncing directories

Or is this just a bug in IO::Handle?

Mostly yes, IO::Handle::sync requires a file handle open with write access.

The following workaround may work: 

use IO::Handle;
sysopen my $dh, "/etc/", 0 or die "unable to open dir";
open my $dh1, ">&", $dh or die "unable to dup handle";
$dh1->sync or die "dir sync failed";

[download]

Replies are listed 'Best First'.
Re^2: fsyncing directories
by betterworld (Curate) on Apr 27, 2010 at 13:26 UTC

    Thank you, this is a nice workaround :) IO::Handle accepts this file handle because it thinks that it is opened for writing.

    From the strace output it seems that this does in fact fsync the directory. Excerpt:

    open("/etc/", O_RDONLY)                 = 3
dup(3)                                  = 4
fsync(4)                                = 0

    [download]

    I don't think the dup() hurts the functionality. Though of course I cannot be sure because I'd have to crash my system repeatedly to see if the effect is the same.

[reply]
[d/l]

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