1Sync(3)               User Contributed Perl Documentation              Sync(3)
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NAME

6       File::Sync - Perl access to fsync() and sync() function calls
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SYNOPSIS

9         use File::Sync qw(fsync sync);
10         sync();
11         fsync(\*FILEHANDLE) or die "fsync: $!";
12         # and if fdatasync() is available on your system:
13         fdatasync($fh) or die "fdatasync: $!";
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15         use File::Sync qw(fsync);
16         use FileHandle;
17         $fh = new FileHandle("> /tmp/foo")
18             or die "new FileHandle: $!";
19         ...
20         $fh->fsync() or die "fsync: $!";
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DESCRIPTION

23       The fsync() function takes a Perl file handle as its only argument, and
24       passes its fileno() to the C function fsync().  It returns undef on
25       failure, or true on success. fdatasync() is identical in return value,
26       but it calls C fdatasync() instead of fsync(), synchronizing only the
27       data in the file, not the metadata.
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29       The fsync_fd() function is used internally by fsync(); it takes a file
30       descriptor as its only argument.
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32       The sync() function is identical to the C function sync().
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34       This module does not export any methods by default, but fsync() is made
35       available as a method of the FileHandle class. Note carefully that as
36       of 0.11, we no longer clobber anything in IO::Handle. You can replace
37       any calls to IO::Handle::fsync() with IO::Handle::sync():
38         https://rt.cpan.org/Public/Bug/Display.html?id=50418
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NOTES

41       Doing fsync() if the stdio buffers aren't flushed (with $| or the
42       autoflush method) is probably pointless.
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44       Calling sync() too often on a multi-user system is slightly antisocial.
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AUTHOR

47       Carey Evans <c.evans@clear.net.nz>
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SEE ALSO

50       perl(1), fsync(2), sync(2), perlvar(1)
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54perl v5.30.1                      2020-01-30                           Sync(3)