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54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/* Copyright (C) 1993-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include "libioP.h"
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#include <stdio.h>
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int
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__fileno (_IO_FILE *fp)
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{
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CHECK_FILE (fp, EOF);
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if (!(fp->_flags & _IO_IS_FILEBUF) || _IO_fileno (fp) < 0)
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{
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__set_errno (EBADF);
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return -1;
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}
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return _IO_fileno (fp);
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}
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libc_hidden_def (__fileno)
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weak_alias (__fileno, fileno)
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libc_hidden_weak (fileno)
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#ifdef weak_alias
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/* The fileno implementation for libio does not require locking because
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it only accesses once a single variable and this is already atomic
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(at least at thread level). Therefore we don't test _IO_MTSAFE_IO here. */
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weak_alias (__fileno, fileno_unlocked)
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#endif
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