/* Duplicate a file descriptor result, avoiding clobbering

   STD{IN,OUT,ERR}_FILENO, with specific flags.

   Copyright (C) 2001, 2004-2006, 2009-2017 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Written by Paul Eggert and Eric Blake.  */

#include <config.h>

/* Specification.  */

#include "unistd-safer.h"

#include <fcntl.h>

#include <unistd.h>

/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or

   STDERR_FILENO.  If FLAG contains O_CLOEXEC, behave like

   fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD).  */

int

dup_safer_flag (int fd, int flag)

{

  return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD,

                STDERR_FILENO + 1);

}