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
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
*
* Copyright (c) 2008 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "qpid/sys/LockFile.h"
#include "check.h"
#include <windows.h>
namespace qpid {
namespace sys {
class LockFilePrivate {
friend class LockFile;
HANDLE fd;
public:
LockFilePrivate(HANDLE f) : fd(f) {}
};
LockFile::LockFile(const std::string& path_, bool create)
: path(path_), created(create) {
HANDLE h = CreateFile(path.c_str(),
GENERIC_READ|GENERIC_WRITE,
0, /* Disable opens by any other attempter */
0, /* Default security */
OPEN_ALWAYS, /* Create if needed */
FILE_FLAG_DELETE_ON_CLOSE, /* Delete file when closed */
NULL);
QPID_WINDOWS_CHECK_NOT(h, INVALID_HANDLE_VALUE);
impl.reset(new LockFilePrivate(h));
}
LockFile::~LockFile() {
if (impl) {
if (impl->fd != INVALID_HANDLE_VALUE) {
CloseHandle(impl->fd);
}
}
}
pid_t LockFile::readPid(void) const {
if (!impl)
throw Exception("Lock file not open");
pid_t pid;
DWORD desired_read = sizeof(pid_t);
DWORD actual_read = 0;
if (!ReadFile(impl->fd, &pid, desired_read, &actual_read, 0)) {
throw Exception("Cannot read lock file " + path);
}
return pid;
}
void LockFile::writePid(void) {
if (!impl)
throw Exception("Lock file not open");
pid_t pid = GetCurrentProcessId();
DWORD desired_write = sizeof(pid_t);
DWORD written = 0;
if (!WriteFile(impl->fd, &pid, desired_write, &written, 0)) {
throw Exception("Cannot write lock file " + path);
}
}
}} /* namespace qpid::sys */
|
