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1 | /* Copyright (C) 1991-2024 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. Return FD2 or -1. */ | |
25 | int | |
26 | __dup2 (int fd, int fd2) | |
27 | { | |
28 | if (fd < 0 || fd2 < 0) | |
29 | { | |
30 | __set_errno (EBADF); | |
31 | return -1; | |
32 | } | |
33 | ||
34 | if (fd == fd2) | |
35 | /* No way to check that they are valid. */ | |
36 | return fd2; | |
37 | ||
38 | __set_errno (ENOSYS); | |
39 | return -1; | |
40 | } | |
41 | libc_hidden_def (__dup2) | |
42 | stub_warning (dup2) | |
43 | ||
44 | weak_alias (__dup2, dup2) |