external/bsd/openldap/dist/include/ac/errno.h

   1 /* Generic errno.h */
   2 /* $OpenLDAP: pkg/ldap/include/ac/errno.h,v 1.30.2.3 2008/02/11 23:26:40 kurt Exp $ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1998-2008 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 #ifndef _AC_ERRNO_H
  18 #define _AC_ERRNO_H
  19
  20 #if defined( HAVE_ERRNO_H )
  21 # include <errno.h>
  22 #elif defined( HAVE_SYS_ERRNO_H )
  23 # include <sys/errno.h>
  24 #endif
  25
  26 #ifndef HAVE_SYS_ERRLIST
  27         /* no sys_errlist */
  28 #       define          sys_nerr        0
  29 #       define          sys_errlist     ((char **)0)
  30 #elif defined( DECL_SYS_ERRLIST )
  31         /* have sys_errlist but need declaration */
  32         LDAP_LIBC_V(int)      sys_nerr;
  33         LDAP_LIBC_V(char)    *sys_errlist[];
  34 #endif
  35
  36 #undef _AC_ERRNO_UNKNOWN
  37 #define _AC_ERRNO_UNKNOWN "unknown error"
  38
  39 #ifdef HAVE_SYS_ERRLIST
  40         /* this is thread safe */
  41 #       define  STRERROR(e) ( (e) > -1 && (e) < sys_nerr \
  42                         ? sys_errlist[(e)] : _AC_ERRNO_UNKNOWN )
  43
  44 #elif defined( HAVE_STRERROR )
  45         /* this may not be thread safe */
  46         /* and, yes, some implementations of strerror may return NULL */
  47 #       define  STRERROR(e) ( strerror(e) \
  48                 ? strerror(e) : _AC_ERRNO_UNKNOWN )
  49
  50 #else
  51         /* this is thread safe */
  52 #       define  STRERROR(e) ( _AC_ERRNO_UNKNOWN )
  53 #endif
  54
  55 #endif /* _AC_ERRNO_H */