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sortix--sortix/libmaxsi/fileno.cpp

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/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of LibMaxsi.
LibMaxsi 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 3 of the License, or (at your option)
any later version.
LibMaxsi 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 LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
fileno.cpp
Returns the underlying file descriptor of a FILE if applicable.
*******************************************************************************/
#include <stdio.h>
#include <errno.h>
extern "C" int fileno(FILE* fp)
{
int result = fp->fileno_func ? fp->fileno_func(fp->user) : -1;
if ( result < 0 ) { errno = EBADF; }
return result;
}