libstdc++-v3/config/io/c_io_stdio.h

   1 // Underlying io library details -*- C++ -*-
   2
   3 // Copyright (C) 2000-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 /** @file bits/c++io.h
  26  *  This is an internal header file, included by other library headers.
  27  *  Do not attempt to use it directly. @headername{ios}
  28  */
  29
  30 // c_io_stdio.h - Defines for using "C" stdio.h
  31
  32 #ifndef _GLIBCXX_CXX_IO_H
  33 #define _GLIBCXX_CXX_IO_H 1
  34
  35 #include <cstdio>
  36 #include <bits/gthr.h>
  37
  38 namespace std _GLIBCXX_VISIBILITY(default)
  39 {
  40 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  41
  42 #ifdef __GTHREAD_LEGACY_MUTEX_T
  43   // The layout of __gthread_mutex_t changed in GCC 13, but libstdc++ doesn't
  44   // actually use the basic_filebuf::_M_lock member, so define it consistently
  45   // with the old __gthread_mutex_t to avoid an unnecessary layout change:
  46   typedef __GTHREAD_LEGACY_MUTEX_T __c_lock;
  47 #else
  48   typedef __gthread_mutex_t __c_lock;
  49 #endif
  50
  51   // for basic_file.h
  52   typedef FILE __c_file;
  53
  54 _GLIBCXX_END_NAMESPACE_VERSION
  55 } // namespace
  56
  57 #endif