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Click here to download plain text source code.

# subroutine name: readdata
# Reads all data from datafile
# If error occurs (e.g. file doesn't exist), makes CGI process exit with error
# Returns: reference to the array of lines, trailing "\n" in each
#          line is not removed
# Global variables used:
#    $no_flock - disable flock or not
sub readdata {
    my($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);
        my $line;
        while ($line = <DATA>) {
            push (@data, $line);
        };
        # unlock file
        flock(DATA, 8) unless ($no_flock);
        close(DATA);
        ReleaseFileLock("$datafile.lock");
    } else {
          ReleaseFileLock("$datafile.lock");
        die("Error in subroutine readdata: Can't open $datafile. Reason: $!");
    };
    return \@data;
}
 
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