OpenVPN
fdmisc.c
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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) 2002-2018 OpenVPN 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 along
20  * with this program; if not, write to the Free Software Foundation, Inc.,
21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22  */
23 
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #elif defined(_MSC_VER)
27 #include "config-msvc.h"
28 #endif
29 
30 #include "syshead.h"
31 
32 #include "fdmisc.h"
33 #include "error.h"
34 
35 #include "memdbg.h"
36 
37 /* Set a file descriptor to non-blocking */
38 bool
40 {
41 #ifdef _WIN32
42  u_long arg = 1;
43  if (ioctlsocket(fd, FIONBIO, &arg))
44  {
45  return false;
46  }
47 #else /* ifdef _WIN32 */
48  if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
49  {
50  return false;
51  }
52 #endif
53  return true;
54 }
55 
56 /* Set a file descriptor to not be passed across execs */
57 bool
59 {
60 #ifndef _WIN32
61  if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
62  {
63  return false;
64  }
65 #endif
66  return true;
67 }
68 
69 /* Set a file descriptor to non-blocking */
70 void
71 set_nonblock(int fd)
72 {
73  if (!set_nonblock_action(fd))
74  {
75  msg(M_ERR, "Set socket to non-blocking mode failed");
76  }
77 }
78 
79 /* Set a file descriptor to not be passed across execs */
80 void
81 set_cloexec(int fd)
82 {
83  if (!set_cloexec_action(fd))
84  {
85  msg(M_ERR, "Set FD_CLOEXEC flag on file descriptor failed");
86  }
87 }
bool set_nonblock_action(int fd)
Definition: fdmisc.c:39
#define msg
Definition: error.h:173
#define M_ERR
Definition: error.h:110
void set_nonblock(int fd)
Definition: fdmisc.c:71
void set_cloexec(int fd)
Definition: fdmisc.c:81
bool set_cloexec_action(int fd)
Definition: fdmisc.c:58