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Click here to download plain text source code.

# subroutine name: writehash
# Input: filename, hash reference
# Writes hash to file in format: <key>\t<value>
#
# Global variables used:
#    $no_flock - disable flock or not
sub writehash {

    my($datafile,$r_rows) = @_;
    GetFileLock("$datafile.lock");

    use Fcntl qw( O_RDWR O_WRONLY O_CREAT O_TRUNC );
    local *DATA;
    if (sysopen(DATA, $datafile, &O_WRONLY | &O_CREAT)) {
        flock(DATA, 2) unless ($no_flock);
        truncate(DATA, 0) or die "Can't truncate $datafile. Reason: $!";
        foreach (keys %$r_rows) {
            print DATA safe_tbl($_)."\t".safe_tbl(${$r_rows}{$_})."\n";
        }
        flock(DATA, 8) unless ($no_flock);
        close(DATA);
        chmod(0666,$datafile);
        ReleaseFileLock("$datafile.lock");
    } else {
        ReleaseFileLock("$datafile.lock");
        die("Error in subroutine writehash: Can't open $datafile. Reason: $!");
    }
}
 
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