1 /* Generic errno.h */ 2 /* $OpenLDAP$ */ 3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>. 4 * 5 * Copyright 1998-2021 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 */ 56