mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-28 23:34:53 +03:00
38 lines
1.4 KiB
C
38 lines
1.4 KiB
C
/* Copyright (C) 2011-2016 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)
|