1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
#ifndef OPENVPN_COMMON_WRITE_H
#define OPENVPN_COMMON_WRITE_H
#include <unistd.h>
#include <stdlib.h> // defines std::abort()
namespace openvpn {
// like posix write() but retry if full buffer is not written
inline ssize_t write_retry(int fd, const void *buf, size_t count)
{
size_t total = 0;
while (true)
{
const ssize_t status = ::write(fd, buf, count);
if (status < 0)
return status;
if (static_cast<size_t>(status) > count) // should never happen
std::abort();
total += status;
count -= status;
if (!count)
break;
buf = static_cast<const unsigned char *>(buf) + status;
}
return total;
}
} // namespace openvpn
#endif
|
