Add per-thread cache to malloc

[thirdparty/glibc.git] / include / errno.h

diff --git a/include/errno.h b/include/errno.h
index 23e0b8f9a91a288eb8d810468076ee2bd8e8608d..3c3d2288c8bb2a8dab9f1b49e36b7e06463a3ff1 100644 (file)
--- a/include/errno.h
+++ b/include/errno.h
@@ -1,73 +1,47 @@
-/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
-
-   The GNU C Library 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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
-
-/*
- *     ISO C Standard: 4.1.3 Errors    <errno.h>
- */
-
-#ifndef        _ERRNO_H
-
-/* The includer defined __need_Emath if he wants only the definitions
-   of EDOM and ERANGE, and not everything else.  */
-#ifndef        __need_Emath
-#define        _ERRNO_H        1
-#include <features.h>
-#endif
+#ifndef _ERRNO_H
+#include <stdlib/errno.h>
+#if !defined _ISOMAC && !defined __ASSEMBLER__
+
+# if IS_IN (rtld)
+#  include <dl-sysdep.h>
+#  ifndef RTLD_PRIVATE_ERRNO
+#   error "dl-sysdep.h must define RTLD_PRIVATE_ERRNO!"
+#  endif
+# else
+#  define RTLD_PRIVATE_ERRNO   0
+# endif
 
-__BEGIN_DECLS
+# if RTLD_PRIVATE_ERRNO
+/* The dynamic linker uses its own private errno variable.
+   All access to errno inside the dynamic linker is serialized,
+   so a single (hidden) global variable is all it needs.  */
 
-/* Get the error number constants from the system-specific file.
-   This file will test __need_Emath and _ERRNO_H.  */
-#include <bits/errno.h>
-#undef __need_Emath
+#  undef  errno
+#  define errno rtld_errno
+extern int rtld_errno attribute_hidden;
 
-#ifdef _ERRNO_H
+# elif IS_IN_LIB
 
-/* Declare the `errno' variable, unless it's defined as a macro by
-   bits/errno.h.  This is the case in GNU, where it is a per-thread
-   variable.  This redeclaration using the macro still works, but it
-   will be a function declaration without a prototype and may trigger
-   a -Wstrict-prototypes warning.  */
-#ifndef        errno
-extern int errno;
-#endif
+#  include <tls.h>
 
-#ifdef __USE_GNU
+#  undef  errno
+#  if IS_IN (libc)
+#   define errno __libc_errno
+#  else
+#   define errno errno         /* For #ifndef errno tests.  */
+#  endif
+extern __thread int errno attribute_tls_model_ie;
 
-/* The full and simple forms of the name with which the program was
-   invoked.  These variables are set up automatically at startup based on
-   the value of ARGV[0] (this works only if you use GNU ld).  */
-extern char *program_invocation_name, *program_invocation_short_name;
-#endif /* __USE_GNU */
-#endif /* _ERRNO_H */
+# endif        /* IS_IN_LIB */
 
-__END_DECLS
+# define __set_errno(val) (errno = (val))
 
-#endif /* _ERRNO_H */
+extern int *__errno_location (void) __THROW __attribute_const__
+#  if RTLD_PRIVATE_ERRNO
+     attribute_hidden
+#  endif
+;
+libc_hidden_proto (__errno_location)
 
-/* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so
-   that printing `error_t' values in the debugger shows the names.  We
-   might need this definition sometimes even if this file was included
-   before.  */
-#if defined __USE_GNU || defined __need_error_t
-# ifndef __error_t_defined
-typedef int error_t;
-#  define __error_t_defined    1
-# endif
-# undef __need_error_t
-#endif
+#endif /* !_ISOMAC && !__ASSEMBLER__ */
+#endif /* !_ERRNO_H */