elfclass.h

glibc 库, 不仅可以学习使用库函数,还可以学习函数的具体实现,是提高功力的好资料

/* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
   Contributed by Martin Schwidefsky ([e-mail]).
   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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* This file specifies the native word size of the machine, which indicates
   the ELF file class used for executables and shared objects on this
   machine.  */

#ifndef _LINK_H
# error "Never use <bits/elfclass.h> directly; include <link.h> instead."
#endif

#include <bits/wordsize.h>

#define __ELF_NATIVE_CLASS __WORDSIZE

#if __WORDSIZE == 64
/* 64 bit Linux for S/390 is exceptional as it has .hash section with
   64 bit entries.  */
typedef uint64_t Elf_Symndx;
#else
/* 32 bit Linux for S/390 has normal .hash section entries with 32 bits.  */
typedef uint32_t Elf_Symndx;
#endif