Index: uspace/lib/c/include/errno.h
===================================================================
--- uspace/lib/c/include/errno.h	(revision eaf22d459455947bd485ac9ce93b76d1d374430b)
+++ uspace/lib/c/include/errno.h	(revision b9c0c90afd5070bcbbba20fb3f1cb8e5599ac51a)
@@ -43,5 +43,5 @@
 #define errno _errno
 
-#define EMFILE        (-17)
+#define EMFILE        (-18)
 #define ENAMETOOLONG  (-256)
 #define EISDIR        (-257)
Index: uspace/lib/c/include/strerror.h
===================================================================
--- uspace/lib/c/include/strerror.h	(revision b9c0c90afd5070bcbbba20fb3f1cb8e5599ac51a)
+++ uspace/lib/c/include/strerror.h	(revision b9c0c90afd5070bcbbba20fb3f1cb8e5599ac51a)
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2010 Martin Decky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libc
+ * @{
+ */
+/** @file
+ */
+
+#ifndef LIBC_STRERROR_H_
+#define LIBC_STRERROR_H_
+
+const char *str_error(const int);
+
+#endif
+
+/** @}
+ */