libstdc++
c++io.h
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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
ISO C++ entities toplevel namespace is std.