libio/putchar.c

   1 /* Copyright (C) 1991-2017 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 #include "libioP.h"
  19 #include "stdio.h"
  20
  21 #undef putchar
  22
  23 int
  24 putchar (int c)
  25 {
  26   int result;
  27   _IO_acquire_lock (_IO_stdout);
  28   result = _IO_putc_unlocked (c, _IO_stdout);
  29   _IO_release_lock (_IO_stdout);
  30   return result;
  31 }
  32
  33 #if defined weak_alias && !defined _IO_MTSAFE_IO
  34 #undef putchar_unlocked
  35 weak_alias (putchar, putchar_unlocked)
  36 #endif