helper method for better access denied to process message

bindings/java/src/net/hyperic/sigar/SigarPermissionDeniedException.java

@@ -2,5 +2,25 @@ package net.hyperic.sigar;
 
 public class SigarPermissionDeniedException extends SigarException {
 
+    public static String getUserDeniedMessage(SigarProxy sigar, long pid) {
+        String user="unknown", owner="unknown";
+
+        try {
+            user = sigar.getProcCredName(sigar.getPid()).getUser();
+        } catch (SigarException e) { }
+
+        try {
+            owner = sigar.getProcCredName(pid).getUser();
+        } catch (SigarException e) { }
+
+        return
+            "User " + user + " denied access to process "
+            + pid + " owned by " + owner;
+    }
+
     public SigarPermissionDeniedException(String s) { super(s); }
+
+    public SigarPermissionDeniedException(SigarProxy sigar, long pid) {
+        super(getUserDeniedMessage(sigar, pid));
+    }
 }