glibc/libio/stdfiles.c

/* Copyright (C) 1993-2024 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
   <https://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.  */


/* This file provides definitions of _IO_2_1_stdin_, _IO_2_1_stdout_,
   and _IO_2_1_stderr_, the default values of stdin, stdout, stderr.
   See oldstdfiles.c for glibc 2.0 legacy definitions without wide
   character support.  */

#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; \
  static struct _IO_wide_data _IO_wide_data_##FD \
    = { ._wide_vtable = &_IO_wfile_jumps }; \
  struct _IO_FILE_plus NAME \
    = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, &_IO_wide_data_##FD), \
       &_IO_file_jumps};
#else
# define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
  static struct _IO_wide_data _IO_wide_data_##FD \
    = { ._wide_vtable = &_IO_wfile_jumps }; \
  struct _IO_FILE_plus NAME \
    = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, &_IO_wide_data_##FD), \
       &_IO_file_jumps};
#endif

DEF_STDFILE(_IO_2_1_stdin_, 0, 0, _IO_NO_WRITES);
DEF_STDFILE(_IO_2_1_stdout_, 1, &_IO_2_1_stdin_, _IO_NO_READS);
DEF_STDFILE(_IO_2_1_stderr_, 2, &_IO_2_1_stdout_, _IO_NO_READS+_IO_UNBUFFERED);

struct _IO_FILE_plus *_IO_list_all = &_IO_2_1_stderr_;

/* Finish double-linking stdin, stdout, and stderr in a constructor.
   Static initialization cannot complete the _prevchain setup.  */

__THROW __attribute__ ((constructor))
static void
_IO_stdfiles_init (void)
{
  struct _IO_FILE **f;
  for (f = (struct _IO_FILE **) &_IO_list_all;
       *f != NULL;
       f = &(*f)->_chain)
    (*f)->_prevchain = f;
}

libc_hidden_data_def (_IO_list_all)