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Click here to download plain text source code.

# subroutine name: sysreaddata
# Reads all data from datafile
# If error occurs (e.g. file doesn't exist), makes CGI process exit with error
# Returns: reference to the content variable (\$content)
# Global variables used:
#    $no_flock - disable flock or not
sub sysreaddata {
    my($datafile) = @_;
    my $data = "";
    # If OS (like Win95) desn't support flock, we have to
    # go unreliable and slow way and create "lock" file
    GetFileLock("$datafile.lock");
    local *DATA;
    if (open(DATA,"<$datafile")) {
        # shared locking
        flock(DATA, 1) unless ($no_flock);
        {
            local($/) = undef;
            $data = <DATA>;
        }
        # unlock file
        flock(DATA, 8) unless ($no_flock);
        close(DATA);
        ReleaseFileLock("$datafile.lock");
    } else {
        ReleaseFileLock("$datafile.lock");
        die("Error in subroutine sysreaddata: can't open $datafile. Reason: $!");
    }
    return \$data;
}
 
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