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glibc/libio/oldstdfiles.c
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/* Copyright (C) 1993-2016 Free Software Foundation, Inc. | |
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, see | |
<http://www.gnu.org/licenses/>. | |
As a special exception, if you link the code in this file with | |
files compiled with a GNU compiler to produce an executable, | |
that does not cause the resulting executable to be covered by | |
the GNU Lesser General Public License. This exception does not | |
however invalidate any other reasons why the executable file | |
might be covered by the GNU Lesser General Public License. | |
This exception applies to code released by its copyright holders | |
in files containing the exception. */ | |
#include <shlib-compat.h> | |
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
/* This file provides definitions of _IO_stdin, _IO_stdout, and _IO_stderr | |
for C code. Compare stdstreams.cc. | |
(The difference is that here the vtable field is set to 0, | |
so the objects defined are not valid C++ objects. On the other | |
hand, we don't need a C++ compiler to build this file.) */ | |
#define _IO_USE_OLD_IO_FILE | |
#include "libioP.h" | |
#ifdef _IO_MTSAFE_IO | |
#define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \ | |
static _IO_lock_t _IO_stdfile_##FD##_lock = _IO_lock_initializer; \ | |
struct _IO_FILE_plus NAME \ | |
= {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), &_IO_old_file_jumps}; | |
#else | |
#define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \ | |
struct _IO_FILE_plus NAME \ | |
= {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), &_IO_old_file_jumps}; | |
#endif | |
DEF_STDFILE(_IO_stdin_, 0, 0, _IO_NO_WRITES); | |
DEF_STDFILE(_IO_stdout_, 1, &_IO_stdin_, _IO_NO_READS); | |
DEF_STDFILE(_IO_stderr_, 2, &_IO_stdout_, _IO_NO_READS+_IO_UNBUFFERED); | |
#if defined __GNUC__ && __GNUC__ >= 2 | |
#include <stdio.h> | |
extern const int _IO_stdin_used; | |
weak_extern (_IO_stdin_used); | |
#undef stdin | |
#undef stdout | |
#undef stderr | |
extern FILE *stdin; | |
extern FILE *stdout; | |
extern FILE *stderr; | |
static void _IO_check_libio (void) __THROW __attribute__ ((constructor)); | |
/* This function determines which shared C library the application | |
was linked against. We then set up the stdin/stdout/stderr and | |
_IO_list_all accordingly. */ | |
static void | |
_IO_check_libio (void) | |
{ | |
if (&_IO_stdin_used == NULL) | |
{ | |
/* We are using the old one. */ | |
_IO_stdin = stdin = (_IO_FILE *) &_IO_stdin_; | |
_IO_stdout = stdout = (_IO_FILE *) &_IO_stdout_; | |
_IO_stderr = stderr = (_IO_FILE *) &_IO_stderr_; | |
_IO_list_all = &_IO_stderr_; | |
_IO_stdin->_vtable_offset = _IO_stdout->_vtable_offset = | |
_IO_stderr->_vtable_offset = stdin->_vtable_offset = | |
stdout->_vtable_offset = stderr->_vtable_offset = | |
((int) sizeof (struct _IO_FILE) | |
- (int) sizeof (struct _IO_FILE_complete)); | |
} | |
} | |
#endif | |
#endif |