/*
  *  OpenVPN -- An application to securely tunnel IP networks
  *             over a single UDP port, with support for SSL/TLS-based
  *             session authentication and key exchange,
  *             packet encryption, packet authentication, and
  *             packet compression.
  *

  *  Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net>

  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2
  *  as published by the Free Software Foundation.
  *
  *  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, write to the Free Software Foundation, Inc.,
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  */
 

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #elif defined(_MSC_VER)
 #include "config-msvc.h"
 #endif
 

 #include "syshead.h"
 
 #include "fdmisc.h"
 #include "error.h"
 
 #include "memdbg.h"
 
 /* Set a file descriptor to non-blocking */

 bool

 set_nonblock_action(int fd)

 {

 #ifdef _WIN32

     u_long arg = 1;
     if (ioctlsocket(fd, FIONBIO, &arg))
     {
         return false;
     }
 #else  /* ifdef _WIN32 */
     if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
     {
         return false;
     }

 #endif

     return true;

 }
 
 /* Set a file descriptor to not be passed across execs */

 bool

 set_cloexec_action(int fd)

 {

 #ifndef _WIN32

     if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
     {
         return false;
     }

 #endif

     return true;

 }
 
 /* Set a file descriptor to non-blocking */
 void

 set_nonblock(int fd)

 {

     if (!set_nonblock_action(fd))
     {
         msg(M_ERR, "Set socket to non-blocking mode failed");
     }

 }
 
 /* Set a file descriptor to not be passed across execs */
 void

 set_cloexec(int fd)

 {

     if (!set_cloexec_action(fd))
     {
         msg(M_ERR, "Set FD_CLOEXEC flag on file descriptor failed");
     }

 }