SYNOPSIS
use File::Sync qw(fsync sync);
sync();
fsync(\*FILEHANDLE) or die "fsync: $!";
# and if fdatasync() is available on your system:
fdatasync($fh) or die "fdatasync: $!";
use File::Sync qw(fsync);
use FileHandle;
$fh = new FileHandle("> /tmp/foo")
or die "new FileHandle: $!";
...
$fh->fsync() or die "fsync: $!";
DESCRIPTION
The fsync() function takes a Perl file handle as its only argument, and passes its fileno() to the C function fsync(). It returns undef on failure, or true on success. fdatasync() is identical in return value, but it calls C fdatasync() instead of fsync(), synchronizing only the data in the file, not the metadata.The fsync_fd() function is used internally by fsync(); it takes a file descriptor as its only argument.
The sync() function is identical to the C function sync().
This module does not export any methods by default, but fsync()
is made available as a method of the FileHandle class. Note carefully
that as of 0.11, we no longer clobber anything in IO::Handle. You
can replace any calls to IO::Handle::fsync() with IO::Handle::sync():
https://rt.cpan.org/Public/Bug/Display.html?id=50418
NOTES
Doing fsync() if the stdio buffers aren't flushed (with $| or the autoflush method) is probably pointless.Calling sync() too often on a multi-user system is slightly antisocial.