text: /* Copyright (C) 2008-2020 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
     <https://www.gnu.org/licenses/>.  */
  
  #include <errno.h>
  #include <fcntl.h>
  #include <unistd.h>
  
  
  /* Duplicate FD to FD2, closing the old FD2 and making FD2 be
     open the same file as FD is which setting flags according to
     FLAGS.  Return FD2 or -1.  */
  int
  __dup3 (int fd, int fd2, int flags)
  {
    if (fd < 0 || fd2 < 0)
      {
        __set_errno (EBADF);
        return -1;
      }
  
    if (fd == fd2)
      /* No way to check that they are valid.  */
      return fd2;
  
    __set_errno (ENOSYS);
    return -1;
  }
  libc_hidden_def (__dup3)
  weak_alias (__dup3, dup3)
  stub_warning (dup3)
  