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) 2002-2022 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
set_nonblock_action(int fd)39 set_nonblock_action(int fd)
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
set_cloexec_action(int fd)58 set_cloexec_action(int fd)
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
set_nonblock(int fd)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
set_cloexec(int fd)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 }
88