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sortix--sortix/libc/stdio/fileno.cpp
2013-12-17 14:30:39 +01:00

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1.2 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of the Sortix C Library.
The Sortix 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 3 of the License, or (at your
option) any later version.
The Sortix 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 Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
stdio/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;
}