--- a/src/dmlib.c	Fri Feb 27 02:21:57 2015 +0200
+++ b/src/dmlib.c	Fri Feb 27 03:58:25 2015 +0200
@@ -51,23 +51,6 @@
 }
 
 
-void dmErrorVA(const char *fmt, va_list ap)
-{
-    fprintf(stderr, "%s: ", dmProgName);
-    vfprintf(stderr, fmt, ap);
-}
-
-
-void dmError(const char *fmt, ...)
-{
-    va_list ap;
-
-    va_start(ap, fmt);
-    dmErrorVA(fmt, ap);
-    va_end(ap);
-}
-
-
 void dmMsg(int level, const char *fmt, ...)
 {
     va_list ap;
@@ -194,6 +177,41 @@
 }
 
 
+int dmErrorVA(const int error, const char *fmt, va_list ap)
+{
+    if (dmProgName != NULL)
+        fprintf(stderr, "%s: ", dmProgName);
+
+    vfprintf(stderr, fmt, ap);
+    return error;
+}
+
+
+int dmError(const int error, const char *fmt, ...)
+{
+    int ret;
+    va_list ap;
+
+    va_start(ap, fmt);
+    ret = dmErrorVA(error, fmt, ap);
+    va_end(ap);
+    return ret;
+}
+
+
+void dmErrorMsg(const char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    dmErrorVA(DMERR_INTERNAL, fmt, ap);
+    va_end(ap);
+}
+
+
+/*
+ * Mutex debugging
+ */
 #ifdef DM_MUTEX_DEBUG
 
 static DMMutexLock * dmGetMutexThreadIDLock(DMMutex *mutex)