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1/* Copyright (C) 2011-2019 Free Software Foundation, Inc.
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
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <fcntl.h>
21#include <limits.h>
22#include <unistd.h>
23
24/* Duplicate FD to FD2, closing the old FD2 and making FD2 be
25 open the same file as FD is. Return FD2 or -1. */
26int
27__dup2 (int fd, int fd2)
28{
29 /* For the degenerate case, check if the fd is valid (by trying to
30 get the file status flags) and return it, or else return EBADF. */
31 if (fd == fd2)
32 return __libc_fcntl (fd, F_GETFL, 0) < 0 ? -1 : fd;
33
34 return INLINE_SYSCALL (dup3, 3, fd, fd2, 0);
35}
36libc_hidden_def (__dup2)
37weak_alias (__dup2, dup2)
38

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