How can I get a list of all mounted filesystems in Java on Unix?

Question

I\'m running Java on a Unix platform. How can I get a list of all mounted filesystems via the Java 1.6 API?

I\'ve tried File.listRoots() but that return

Answer 1

You can call the getmntent function (use "man getmntent" to get more information) using JNA.

Here is some example code to get you started:

import java.util.Arrays;
import java.util.List;

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;

public class MntPointTest {
    public static class mntent extends Structure {
        public String mnt_fsname; //Device or server for filesystem
        public String mnt_dir; //Directory mounted on
        public String mnt_type; //Type of filesystem: ufs, nfs, etc.
        public String mnt_opts;
        public int mnt_freq;
        public int mnt_passno;

        @Override
        protected List getFieldOrder() {
            return Arrays.asList("mnt_fsname", "mnt_dir", "mnt_type", "mnt_opts", "mnt_freq", "mnt_passno");
        }
    }

    public interface CLib extends Library {
        CLib INSTANCE = (CLib) Native.loadLibrary("c", CLib.class);

        Pointer setmntent(String file, String mode);
        mntent getmntent(Pointer stream);
        int endmntent(Pointer stream);
    }

    public static void main(String[] args) {
        mntent mntEnt;
        Pointer stream = CLib.INSTANCE.setmntent("/etc/mtab", "r");
        while ((mntEnt = CLib.INSTANCE.getmntent(stream)) != null) {
            System.out.println("Mounted from: " + mntEnt.mnt_fsname);
            System.out.println("Mounted on: " + mntEnt.mnt_dir);
            System.out.println("File system type: " + mntEnt.mnt_type);
            System.out.println("-------------------------------");
        }

        CLib.INSTANCE.endmntent(stream);
    }
}