Added the strerror_r_wrapper()

The  strerror_r_wrapper() function wraps the XSI compliant version of
strerror_r().

This wrapper facilitates the task of having the XSI compliant verson
of strerror_r() as opposed to the GNU version.  In order to the XSI
compliant version, the implemenation file common/strerror_r_wrapper.cpp
undefines _GNU_SOURCE and defines _XOPEN_SOURCE to be 600.

Please note that the strerror_r_wrapper() is not yet called by any
other code in CASTOR.  The purpose of this commit is to see how the
wrapper function compiles on SLC5, SLC6 and MAC.

mediachanger/castorrmc/common/strerror_r_wrapper.cpp

+/******************************************************************************
+ *         common/strerror_r_wrapper.cpp
+ *
+ * This file is part of the Castor project.
+ * See http://castor.web.cern.ch/castor
+ *
+ * Copyright (C) 2003  CERN
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *
+ *
+ * @author Steven.Murray@cern.ch
+ *****************************************************************************/
+
+#include "h/strerror_r_wrapper.hpp"
+
+#if defined(linux)
+#undef _GNU_SOURCE
+#define _XOPEN_SOURCE 600
+#endif
+
+#include <string.h>
+
+/*******************************************************************************
+ * strerror_r_wrapper
+ ******************************************************************************/
+int strerror_r_wrapper(int errnum, char *buf, unsigned int buflen) {
+  return strerror_r(errnum, buf, buflen);
+}

mediachanger/castorrmc/h/strerror_r_wrapper.hpp

+/******************************************************************************
+ *         h/strerror_r_wrapper.h
+ *
+ * This file is part of the Castor project.
+ * See http://castor.web.cern.ch/castor
+ *
+ * Copyright (C) 2003  CERN
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *
+ *
+ * @author Steven.Murray@cern.ch
+ *****************************************************************************/
+
+#ifndef H_STRERROR_R_WRAPPER_H
+#define H_STRERROR_R_WRAPPER_H 1
+
+#include <stddef.h>
+
+/* The following EXTERN_C marco has been intentionally copied from          */
+/* h/osdep.h instead of just including h/osdep.h.  The reason for this is   */
+/* this header file must include the minimum number of header files because */
+/* the implementation file common/strerror_r_wrapper.cpp will undefine      */
+/* _GNU_SOURCE and define _XOPEN_SOURCE as being 600.                       */
+/*                                                                          */
+/* Macros for externalization (UNIX) (J.-D.Durand)                          */
+#ifdef EXTERN_C
+#undef EXTERN_C
+#endif
+#if defined(__cplusplus)
+#define EXTERN_C extern "C"
+#else
+#define EXTERN_C extern
+#endif
+
+/**
+ * This function wraps the XSI compliant version of strerror_r() and therefore
+ * writes the string representation of the specified error number to the
+ * specified buffer.
+ * 
+ * @param errnum The error number.
+ * @param buf The buffer.
+ * @param buflen The length of the buffer.
+ */
+EXTERN_C int strerror_r_wrapper(int errnum, char *buf, size_t buflen);
+
+#endif /* H_STRERROR_R_WRAPPER_H */