sync with HEAD

[openldap] / include / ac / errno.h

diff --git a/include/ac/errno.h b/include/ac/errno.h
index b4854c8ba027b1c762f0a0796e271ae6a7b9ece4..e1b7168cacaa2352f68ed106d0aac918226ea47d 100644 (file)
--- a/include/ac/errno.h
+++ b/include/ac/errno.h
@@ -1,19 +1,55 @@
 /* Generic errno.h */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2004 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
 
 #ifndef _AC_ERRNO_H
 #define _AC_ERRNO_H
 
-#if defined( HAVE_SYS_ERRNO_H )
-# include <sys/errno.h>
-#elif defined( HAVE_ERRNO_H )
+#if defined( HAVE_ERRNO_H )
 # include <errno.h>
+#elif defined( HAVE_SYS_ERRNO_H )
+# include <sys/errno.h>
+#endif
+
+#ifndef HAVE_SYS_ERRLIST
+       /* no sys_errlist */
+#      define          sys_nerr        0
+#      define          sys_errlist     ((char **)0)
+#elif DECL_SYS_ERRLIST
+       /* have sys_errlist but need declaration */
+       LDAP_LIBC_V(int)      sys_nerr;
+       LDAP_LIBC_V(char)    *sys_errlist[];
 #endif
 
-#ifdef DECL_SYS_ERRLIST 
-extern int      sys_nerr;
-extern char     *sys_errlist[];
+#undef _AC_ERRNO_UNKNOWN
+#define _AC_ERRNO_UNKNOWN "unknown error"
+
+#ifdef HAVE_SYS_ERRLIST
+       /* this is thread safe */
+#      define  STRERROR(e) ( (e) > -1 && (e) < sys_nerr \
+                       ? sys_errlist[(e)] : _AC_ERRNO_UNKNOWN )
+
+#elif defined( HAVE_STRERROR )
+       /* this may not be thread safe */
+       /* and, yes, some implementations of strerror may return NULL */
+#      define  STRERROR(e) ( strerror(e) \
+               ? strerror(e) : _AC_ERRNO_UNKNOWN )
+
+#else
+       /* this is thread safe */
+#      define  STRERROR(e) ( _AC_ERRNO_UNKNOWN )
 #endif
-    
-/* use _POSIX_VERSION for POSIX.1 code */
 
 #endif /* _AC_ERRNO_H */