/* Copyright (C) 1993-2015 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 <http://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. */ #include "libioP.h" #include <stdio.h> int __fileno (fp) _IO_FILE* fp; { CHECK_FILE (fp, EOF); if (!(fp->_flags & _IO_IS_FILEBUF) || _IO_fileno (fp) < 0) { __set_errno (EBADF); return -1; } return _IO_fileno (fp); } libc_hidden_def (__fileno) weak_alias (__fileno, fileno) libc_hidden_weak (fileno) #ifdef weak_alias /* The fileno implementation for libio does not require locking because it only accesses once a single variable and this is already atomic (at least at thread level). Therefore we don't test _IO_MTSAFE_IO here. */ weak_alias (__fileno, fileno_unlocked) #endif