| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 2008-2015 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 | <http://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 (fd, fd2, flags) |
| 28 | int fd; |
| 29 | int fd2; |
| 30 | int flags; |
| 31 | { |
| 32 | if (fd < 0 || fd2 < 0) |
| 33 | { |
| 34 | __set_errno (EBADF); |
| 35 | return -1; |
| 36 | } |
| 37 | |
| 38 | if (fd == fd2) |
| 39 | /* No way to check that they are valid. */ |
| 40 | return fd2; |
| 41 | |
| 42 | __set_errno (ENOSYS); |
| 43 | return -1; |
| 44 | } |
| 45 | libc_hidden_def (__dup3) |
| 46 | weak_alias (__dup3, dup3) |
| 47 | stub_warning (dup3) |