1/* Copyright (C) 1993-2018 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>.
17
18 As a special exception, if you link the code in this file with
19 files compiled with a GNU compiler to produce an executable,
20 that does not cause the resulting executable to be covered by
21 the GNU Lesser General Public License. This exception does not
22 however invalidate any other reasons why the executable file
23 might be covered by the GNU Lesser General Public License.
24 This exception applies to code released by its copyright holders
25 in files containing the exception. */
26
27#include <shlib-compat.h>
28#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
29
30/* This file provides definitions of _IO_stdin, _IO_stdout, and _IO_stderr
31 for C code. Compare stdstreams.cc.
32 (The difference is that here the vtable field is set to 0,
33 so the objects defined are not valid C++ objects. On the other
34 hand, we don't need a C++ compiler to build this file.) */
35
36#define _IO_USE_OLD_IO_FILE
37#include "libioP.h"
38
39#ifdef _IO_MTSAFE_IO
40#define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
41 static _IO_lock_t _IO_stdfile_##FD##_lock = _IO_lock_initializer; \
42 struct _IO_FILE_plus NAME \
43 = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), &_IO_old_file_jumps};
44#else
45#define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
46 struct _IO_FILE_plus NAME \
47 = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), &_IO_old_file_jumps};
48#endif
49
50DEF_STDFILE(_IO_stdin_, 0, 0, _IO_NO_WRITES);
51DEF_STDFILE(_IO_stdout_, 1, &_IO_stdin_, _IO_NO_READS);
52DEF_STDFILE(_IO_stderr_, 2, &_IO_stdout_, _IO_NO_READS+_IO_UNBUFFERED);
53
54#if defined __GNUC__ && __GNUC__ >= 2
55
56#include <stdio.h>
57
58extern const int _IO_stdin_used;
59weak_extern (_IO_stdin_used);
60
61#undef stdin
62#undef stdout
63#undef stderr
64
65extern FILE *stdin;
66extern FILE *stdout;
67extern FILE *stderr;
68
69static void _IO_check_libio (void) __THROW __attribute__ ((constructor));
70
71/* This function determines which shared C library the application
72 was linked against. We then set up the stdin/stdout/stderr and
73 _IO_list_all accordingly. */
74
75static void
76_IO_check_libio (void)
77{
78 if (&_IO_stdin_used == NULL)
79 {
80 /* We are using the old one. */
81 _IO_stdin = stdin = (_IO_FILE *) &_IO_stdin_;
82 _IO_stdout = stdout = (_IO_FILE *) &_IO_stdout_;
83 _IO_stderr = stderr = (_IO_FILE *) &_IO_stderr_;
84 _IO_list_all = &_IO_stderr_;
85 _IO_stdin->_vtable_offset = _IO_stdout->_vtable_offset =
86 _IO_stderr->_vtable_offset = stdin->_vtable_offset =
87 stdout->_vtable_offset = stderr->_vtable_offset =
88 ((int) sizeof (struct _IO_FILE)
89 - (int) sizeof (struct _IO_FILE_complete));
90 }
91}
92
93#endif
94
95#endif
96