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) 2002-2025 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, see <https://www.gnu.org/licenses/>.
21 */
22
23#ifdef HAVE_CONFIG_H
24#include "config.h"
25#endif
26
27#include "syshead.h"
28
29#include "fdmisc.h"
30#include "error.h"
31
32#include "memdbg.h"
33
34/* Set a file descriptor to non-blocking */
35bool
37{
38#ifdef _WIN32
39 u_long arg = 1;
40 if (ioctlsocket(fd, FIONBIO, &arg))
41 {
42 return false;
43 }
44#else /* ifdef _WIN32 */
45 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
46 {
47 return false;
48 }
49#endif
50 return true;
51}
52
53/* Set a file descriptor to not be passed across execs */
54bool
56{
57#ifndef _WIN32
58 if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
59 {
60 return false;
61 }
62#endif
63 return true;
64}
65
66/* Set a file descriptor to non-blocking */
67void
69{
70 if (!set_nonblock_action(fd))
71 {
72 msg(M_ERR, "Set socket to non-blocking mode failed");
73 }
74}
75
76/* Set a file descriptor to not be passed across execs */
77void
79{
80 if (!set_cloexec_action(fd))
81 {
82 msg(M_ERR, "Set FD_CLOEXEC flag on file descriptor failed");
83 }
84}
void set_nonblock(socket_descriptor_t fd)
Definition fdmisc.c:68
bool set_cloexec_action(socket_descriptor_t fd)
Definition fdmisc.c:55
void set_cloexec(socket_descriptor_t fd)
Definition fdmisc.c:78
bool set_nonblock_action(socket_descriptor_t fd)
Definition fdmisc.c:36
#define M_ERR
Definition error.h:104
#define msg(flags,...)
Definition error.h:150
SOCKET socket_descriptor_t
Definition syshead.h:440