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688903eb | 1 | /* Copyright (C) 1993-2018 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
40a55d20 | 3 | |
41bdb6e2 AJ |
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. | |
40a55d20 | 8 | |
41bdb6e2 AJ |
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 | |
40a55d20 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 AJ |
12 | Lesser General Public License for more details. |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. | |
41bdb6e2 AJ |
17 | |
18 | As a special exception, if you link the code in this file with | |
19 | files compiled with a GNU compiler to produce an executable, | |
20 | that does not cause the resulting executable to be covered by | |
21 | the GNU Lesser General Public License. This exception does not | |
22 | however invalidate any other reasons why the executable file | |
23 | might be covered by the GNU Lesser General Public License. | |
24 | This exception applies to code released by its copyright holders | |
25 | in files containing the exception. */ | |
96aa2d94 RM |
26 | |
27 | #include "libioP.h" | |
3ba06713 | 28 | #include <stdio.h> |
96aa2d94 RM |
29 | |
30 | int | |
9964a145 | 31 | __fileno (FILE *fp) |
96aa2d94 RM |
32 | { |
33 | CHECK_FILE (fp, EOF); | |
34 | ||
110215a9 UD |
35 | if (!(fp->_flags & _IO_IS_FILEBUF) || _IO_fileno (fp) < 0) |
36 | { | |
37 | __set_errno (EBADF); | |
38 | return -1; | |
39 | } | |
96aa2d94 RM |
40 | |
41 | return _IO_fileno (fp); | |
42 | } | |
5a6fa4d7 JM |
43 | libc_hidden_def (__fileno) |
44 | weak_alias (__fileno, fileno) | |
45 | libc_hidden_weak (fileno) | |
7c713e28 | 46 | |
7c713e28 RM |
47 | /* The fileno implementation for libio does not require locking because |
48 | it only accesses once a single variable and this is already atomic | |
ffa8d2a0 | 49 | (at least at thread level). Therefore we don't test _IO_MTSAFE_IO here. */ |
7c713e28 | 50 | |
5a6fa4d7 | 51 | weak_alias (__fileno, fileno_unlocked) |