libio/stdfiles.c

   1 /* Copyright (C) 1993-2017 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
  28 /* This file provides definitions of _IO_stdin, _IO_stdout, and _IO_stderr
  29    for C code.  Compare stdstreams.cc.
  30    (The difference is that here the vtable field is set to 0,
  31    so the objects defined are not valid C++ objects.  On the other
  32    hand, we don't need a C++ compiler to build this file.) */
  33
  34 #include "libioP.h"
  35
  36 #ifdef _IO_MTSAFE_IO
  37 # if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
  38 #  define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
  39   static _IO_lock_t _IO_stdfile_##FD##_lock = _IO_lock_initializer; \
  40   static struct _IO_wide_data _IO_wide_data_##FD \
  41     = { ._wide_vtable = &_IO_wfile_jumps }; \
  42   struct _IO_FILE_plus NAME \
  43     = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, &_IO_wide_data_##FD), \
  44        &_IO_file_jumps};
  45 # else
  46 #  define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
  47   static _IO_lock_t _IO_stdfile_##FD##_lock = _IO_lock_initializer; \
  48   struct _IO_FILE_plus NAME \
  49     = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), \
  50        &_IO_file_jumps};
  51 # endif
  52 #else
  53 # if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
  54 #  define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
  55   static struct _IO_wide_data _IO_wide_data_##FD \
  56     = { ._wide_vtable = &_IO_wfile_jumps }; \
  57   struct _IO_FILE_plus NAME \
  58     = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, &_IO_wide_data_##FD), \
  59        &_IO_file_jumps};
  60 # else
  61 #  define DEF_STDFILE(NAME, FD, CHAIN, FLAGS) \
  62   struct _IO_FILE_plus NAME \
  63     = {FILEBUF_LITERAL(CHAIN, FLAGS, FD, NULL), \
  64        &_IO_file_jumps};
  65 # endif
  66 #endif
  67
  68 DEF_STDFILE(_IO_2_1_stdin_, 0, 0, _IO_NO_WRITES);
  69 DEF_STDFILE(_IO_2_1_stdout_, 1, &_IO_2_1_stdin_, _IO_NO_READS);
  70 DEF_STDFILE(_IO_2_1_stderr_, 2, &_IO_2_1_stdout_, _IO_NO_READS+_IO_UNBUFFERED);
  71
  72 struct _IO_FILE_plus *_IO_list_all = &_IO_2_1_stderr_;
  73 libc_hidden_data_def (_IO_list_all)