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2b778ceb | 1 | /* Copyright (C) 2011-2021 Free Software Foundation, Inc. |
a63c7fa1 CM |
2 | This file is part of the GNU C Library. |
3 | Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
ab84e3ff | 16 | License along with the GNU C Library. If not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
a63c7fa1 | 18 | |
a63c7fa1 | 19 | #include <fcntl.h> |
a63c7fa1 | 20 | #include <unistd.h> |
01bd6251 | 21 | #include <sysdep.h> |
a63c7fa1 CM |
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 | /* For the degenerate case, check if the fd is valid (by trying to | |
29 | get the file status flags) and return it, or else return EBADF. */ | |
30 | if (fd == fd2) | |
31 | return __libc_fcntl (fd, F_GETFL, 0) < 0 ? -1 : fd; | |
32 | ||
33 | return INLINE_SYSCALL (dup3, 3, fd, fd2, 0); | |
34 | } | |
35 | libc_hidden_def (__dup2) | |
36 | weak_alias (__dup2, dup2) |