Added functions to access the errno of the native system when using the

newlib C library.

Fixed bug where length did not take into account amount added
for alignment requirements.

c/src/lib/libc/hosterr.c

@@ -0,0 +1,42 @@
+/*
+ *  Routines to access a host errno
+ *
+ *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
+ *  On-Line Applications Research Corporation (OAR).
+ *  All rights assigned to U.S. Government, 1994.
+ *
+ *  This material may be reproduced by or for the U.S. Government pursuant
+ *  to the copyright license under the clause at DFARS 252.227-7013.  This
+ *  notice must appear in all copies of this file and its derivatives.
+ *
+ */
+
+#include <rtems.h>
+#include <errno.h>
+
+int host_errno(void);
+
+/*
+ * copy host errno, if any to thread aware errno, if any
+ */
+
+void fix_syscall_errno(void)
+{
+    errno = host_errno();
+}
+
+/*
+ * Get the host system errno, if any
+ * When using newlib (or possibly other libc's) on top of UNIX
+ * the errno returned by system calls may be unavailable due
+ * to trickery of making errno thread aware.
+ * This provides a kludge of getting at it.
+ */
+
+#undef errno
+extern int errno;
+int host_errno(void)
+{
+    return errno;
+}
+