1/* Copyright (C) 1993-2020 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 <https://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 legacy definitions of _IO_stdin_, _IO_stdout_,
31 and _IO_stderr_. See stdfiles.c for the current definitions. */
32
33#define _IO_USE_OLD_IO_FILE
34#include "libioP.h"
35
36#ifdef _IO_MTSAFE_IO
37#define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
38 static _IO_lock_t _IO_stdfile_##FD##_lock = _IO_lock_initializer; \
39 struct _IO_FILE_plus NAME \
40 = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), &_IO_old_file_jumps};
41#else
42#define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
43 struct _IO_FILE_plus NAME \
44 = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), &_IO_old_file_jumps};
45#endif
46
47DEF_STDFILE(_IO_stdin_, 0, 0, _IO_NO_WRITES);
48DEF_STDFILE(_IO_stdout_, 1, &_IO_stdin_, _IO_NO_READS);
49DEF_STDFILE(_IO_stderr_, 2, &_IO_stdout_, _IO_NO_READS+_IO_UNBUFFERED);
50
51#if defined __GNUC__ && __GNUC__ >= 2
52
53#include <stdio.h>
54
55extern const int _IO_stdin_used;
56weak_extern (_IO_stdin_used);
57
58#undef stdin
59#undef stdout
60#undef stderr
61
62extern FILE *stdin;
63extern FILE *stdout;
64extern FILE *stderr;
65
66static void _IO_check_libio (void) __THROW __attribute__ ((constructor));
67
68/* This function determines which shared C library the application
69 was linked against. We then set up the stdin/stdout/stderr and
70 _IO_list_all accordingly. */
71
72static void
73_IO_check_libio (void)
74{
75 if (&_IO_stdin_used == NULL)
76 {
77 /* We are using the old one. */
78 stdin = (FILE *) &_IO_stdin_;
79 stdout = (FILE *) &_IO_stdout_;
80 stderr = (FILE *) &_IO_stderr_;
81 _IO_list_all = &_IO_stderr_;
82 stdin->_vtable_offset = stdout->_vtable_offset
83 = stderr->_vtable_offset =
84 ((int) sizeof (struct _IO_FILE)
85 - (int) sizeof (struct _IO_FILE_complete));
86
87 if (_IO_stdin_.vtable != &_IO_old_file_jumps
88 || _IO_stdout_.vtable != &_IO_old_file_jumps
89 || _IO_stderr_.vtable != &_IO_old_file_jumps)
90 IO_set_accept_foreign_vtables (&_IO_vtable_check);
91 }
92}
93
94#endif
95
96#endif
97