release/src/router/openvpn/fdmisc.c

   1 /*
   2  *  OpenVPN -- An application to securely tunnel IP networks
   3  *             over a single UDP port, with support for SSL/TLS-based
   4  *             session authentication and key exchange,
   5  *             packet encryption, packet authentication, and
   6  *             packet compression.
   7  *
   8  *  Copyright (C) 2002-2009 OpenVPN Technologies, Inc. <sales@openvpn.net>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2
  12  *  as published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program (see the file COPYING included with this
  21  *  distribution); if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "syshead.h"
  26
  27 #include "fdmisc.h"
  28 #include "error.h"
  29
  30 #include "memdbg.h"
  31
  32 /* Set a file descriptor to non-blocking */
  33 bool
  34 set_nonblock_action (int fd)
  35 {
  36 #ifdef WIN32
  37   u_long arg = 1;
  38   if (ioctlsocket (fd, FIONBIO, &arg))
  39     return false;
  40 #else
  41   if (fcntl (fd, F_SETFL, O_NONBLOCK) < 0)
  42     return false;
  43 #endif
  44   return true;
  45 }
  46
  47 /* Set a file descriptor to not be passed across execs */
  48 bool
  49 set_cloexec_action (int fd)
  50 {
  51 #ifndef WIN32
  52   if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0)
  53     return false;
  54 #endif
  55   return true;
  56 }
  57
  58 /* Set a file descriptor to non-blocking */
  59 void
  60 set_nonblock (int fd)
  61 {
  62   if (!set_nonblock_action (fd))
  63     msg (M_SOCKERR, "Set socket to non-blocking mode failed");
  64 }
  65
  66 /* Set a file descriptor to not be passed across execs */
  67 void
  68 set_cloexec (int fd)
  69 {
  70   if (!set_cloexec_action (fd))
  71     msg (M_ERR, "Set FD_CLOEXEC flag on file descriptor failed");
  72 }