How to check if a file is open by another process (Java/Linux)?

Question

I am trying to check if a certain java.io.File is open by an external program. On windows I use this simple trick:

try {
    FileOutputStream fos = new FileO         


        

Answer 1

Here's a sample how to use lsof for unix based systems:

public static boolean isFileClosed(File file) {
    try {
        Process plsof = new ProcessBuilder(new String[]{"lsof", "|", "grep", file.getAbsolutePath()}).start();
        BufferedReader reader = new BufferedReader(new InputStreamReader(plsof.getInputStream()));
        String line;
        while((line=reader.readLine())!=null) {
            if(line.contains(file.getAbsolutePath())) {                            
                reader.close();
                plsof.destroy();
                return false;
            }
        }
    } catch(Exception ex) {
        // TODO: handle exception ...
    }
    reader.close();
    plsof.destroy();
    return true;
}

Hope this helps.