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[thirdparty/glibc.git] / sysdeps / mach / hurd / dup2.c

/* Copyright (C) 1991-2019 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   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 <unistd.h>

/* Duplicate FD to FD2, closing the old FD2 and making FD2 be
   open on the same file as FD is.  Return FD2 or -1.  */
int
__dup2 (int fd, int fd2)
{
  int flags = 0;

  if (fd2 == fd)
    /* See the comment in dup3.  */
    flags = -1;

  return __dup3 (fd, fd2, flags);
}
libc_hidden_def (__dup2)
weak_alias (__dup2, dup2)