1 | /* Copyright (C) 2008-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
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. |
8 | |
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 |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <fcntl.h> |
20 | #include <unistd.h> |
21 | |
22 | |
23 | /* Duplicate FD to FD2, closing the old FD2 and making FD2 be |
24 | open the same file as FD is which setting flags according to |
25 | FLAGS. Return FD2 or -1. */ |
26 | int |
27 | __dup3 (int fd, int fd2, int flags) |
28 | { |
29 | if (fd < 0 || fd2 < 0) |
30 | { |
31 | __set_errno (EBADF); |
32 | return -1; |
33 | } |
34 | |
35 | if (fd == fd2) |
36 | /* No way to check that they are valid. */ |
37 | return fd2; |
38 | |
39 | __set_errno (ENOSYS); |
40 | return -1; |
41 | } |
42 | libc_hidden_def (__dup3) |
43 | weak_alias (__dup3, dup3) |
44 | stub_warning (dup3) |
45 | |