1 /* Copyright (C) 1991-2021 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 <https://www.gnu.org/licenses/>. */ 17 18 #include "libioP.h" 19 #include "stdio.h" 20 21 #undef putchar 22 23 int putchar(int c)24putchar (int c) 25 { 26 int result; 27 _IO_acquire_lock (stdout); 28 result = _IO_putc_unlocked (c, stdout); 29 _IO_release_lock (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 37