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a5406364ac
These variables are only used to determine if a stdio stream is a pre-allocated stream, but it is possible to do so by comparing a FILE * to all pre-allocated stream objects. As a result, it is not necessary to keep those pointers in separate variables. Behavior with symbol interposition is unchanged because _IO_stdin_, _IO_stdout_, _IO_stderr_ are exported, and refer to objects outside of libc if symbol interposition or copy relocations are involved. (The removed variables _IO_stdin, _IO_stdout, _IO_stderr were not exported, of course.)
92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/* Copyright (C) 1993-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
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/* This file provides legacy definitions of _IO_stdin_, _IO_stdout_,
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and _IO_stderr_. See stdfiles.c for the current definitions. */
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#define _IO_USE_OLD_IO_FILE
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#include "libioP.h"
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#ifdef _IO_MTSAFE_IO
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#define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
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static _IO_lock_t _IO_stdfile_##FD##_lock = _IO_lock_initializer; \
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struct _IO_FILE_plus NAME \
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= {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), &_IO_old_file_jumps};
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#else
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#define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
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struct _IO_FILE_plus NAME \
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= {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), &_IO_old_file_jumps};
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#endif
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DEF_STDFILE(_IO_stdin_, 0, 0, _IO_NO_WRITES);
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DEF_STDFILE(_IO_stdout_, 1, &_IO_stdin_, _IO_NO_READS);
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DEF_STDFILE(_IO_stderr_, 2, &_IO_stdout_, _IO_NO_READS+_IO_UNBUFFERED);
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#if defined __GNUC__ && __GNUC__ >= 2
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#include <stdio.h>
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extern const int _IO_stdin_used;
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weak_extern (_IO_stdin_used);
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#undef stdin
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#undef stdout
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#undef stderr
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extern FILE *stdin;
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extern FILE *stdout;
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extern FILE *stderr;
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static void _IO_check_libio (void) __THROW __attribute__ ((constructor));
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/* This function determines which shared C library the application
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was linked against. We then set up the stdin/stdout/stderr and
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_IO_list_all accordingly. */
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static void
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_IO_check_libio (void)
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{
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if (&_IO_stdin_used == NULL)
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{
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/* We are using the old one. */
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stdin = (FILE *) &_IO_stdin_;
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stdout = (FILE *) &_IO_stdout_;
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stderr = (FILE *) &_IO_stderr_;
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_IO_list_all = &_IO_stderr_;
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stdin->_vtable_offset = stdout->_vtable_offset
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= stderr->_vtable_offset =
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((int) sizeof (struct _IO_FILE)
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- (int) sizeof (struct _IO_FILE_complete));
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}
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}
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#endif
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#endif
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