| 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) |
| 45 |