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) 2002-2024 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 #endif
27 
28 #include "syshead.h"
29 
30 #include "fdmisc.h"
31 #include "error.h"
32 
33 #include "memdbg.h"
34 
35 /* Set a file descriptor to non-blocking */
36 bool
38 {
39 #ifdef _WIN32
40  u_long arg = 1;
41  if (ioctlsocket(fd, FIONBIO, &arg))
42  {
43  return false;
44  }
45 #else /* ifdef _WIN32 */
46  if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
47  {
48  return false;
49  }
50 #endif
51  return true;
52 }
53 
54 /* Set a file descriptor to not be passed across execs */
55 bool
57 {
58 #ifndef _WIN32
59  if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)
60  {
61  return false;
62  }
63 #endif
64  return true;
65 }
66 
67 /* Set a file descriptor to non-blocking */
68 void
70 {
71  if (!set_nonblock_action(fd))
72  {
73  msg(M_ERR, "Set socket to non-blocking mode failed");
74  }
75 }
76 
77 /* Set a file descriptor to not be passed across execs */
78 void
80 {
81  if (!set_cloexec_action(fd))
82  {
83  msg(M_ERR, "Set FD_CLOEXEC flag on file descriptor failed");
84  }
85 }
error.h
set_nonblock_action
bool set_nonblock_action(socket_descriptor_t fd)
Definition: fdmisc.c:37
fdmisc.h
M_ERR
#define M_ERR
Definition: error.h:105
set_cloexec_action
bool set_cloexec_action(socket_descriptor_t fd)
Definition: fdmisc.c:56
set_nonblock
void set_nonblock(socket_descriptor_t fd)
Definition: fdmisc.c:69
syshead.h
socket_descriptor_t
SOCKET socket_descriptor_t
Definition: syshead.h:429
set_cloexec
void set_cloexec(socket_descriptor_t fd)
Definition: fdmisc.c:79
config.h
memdbg.h
msg
#define msg(flags,...)
Definition: error.h:144