Carey Evans

NAME

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

SYNOPSIS

  use File::Sync qw(fsync sync);
  fsync(\*FILEHANDLE) or die "fsync: $!";
  sync();

  use File::Sync qw(fsync);
  use IO::File;
  $fh = IO::File->new("> /tmp/foo") 
      or die "new IO::File: $!";
  ...
  fsync($fh) 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.

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 and IO::Handle classes.

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.

AUTHOR

Carey Evans <c.evans@clear.net.nz>

SEE ALSO

perl(1), fsync(2), sync(2), perlvar(1)