| /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <unistd.h> |
| |
| /* Duplicate FD to FD2, closing the old FD2 and making FD2 be |
| open the same file as FD is. Return FD2 or -1. */ |
| int |
| __dup2 (int fd, int fd2) |
| { |
| /* For the degenerate case, check if the fd is valid (by trying to |
| get the file status flags) and return it, or else return EBADF. */ |
| if (fd == fd2) |
| return __libc_fcntl (fd, F_GETFL, 0) < 0 ? -1 : fd; |
| |
| return INLINE_SYSCALL (dup3, 3, fd, fd2, 0); |
| } |
| libc_hidden_def (__dup2) |
| weak_alias (__dup2, dup2) |
