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package ch.cern.mig.posix;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import com.sun.jna.LastErrorException;
import com.sun.jna.Native;
import com.sun.jna.Platform;

public class Posix {
    public static final String LIBC = Platform.isLinux() ? "libc.so.6" : "c";
    public static final LibC libc = (LibC) Native.loadLibrary(LIBC,
            Platform.isLinux() ? LinuxLibC.class : LibC.class);
    public static final BasePosix posix = Platform.isLinux() ? new LinuxPosix(
            libc) : new BasePosix(libc);

    public static int getErrorCode(LastErrorException error) {
        String aMethod = "getErrorCode";
        // get the method
        Object result = null;
        try {
            Method thisMethod = error.getClass().getDeclaredMethod(aMethod);
            result = thisMethod.invoke(error);
        } catch (Exception e) {
            try {
                Field field = error.getClass().getField("errorCode");
                result = field.get(error);
            } catch (Exception e1) {
                throw new IllegalStateException("Could not get the error code");
            }
        }
        return (Integer) result;
    }
}