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
|
#ifndef _sys_posix_LockFile_h
#define _sys_posix_LockFile_h
#include "check.h"
#include <boost/noncopyable.hpp>
#include <string>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
/*
*
* 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.
*
*/
namespace qpid {
namespace sys {
class LockFile : private boost::noncopyable {
public:
LockFile(const std::string& path_, bool create):
path(path_), fd(-1), created(create) {
errno = 0;
int flags=create ? O_WRONLY|O_CREAT|O_NOFOLLOW : O_RDWR;
fd = ::open(path.c_str(), flags, 0644);
if (fd < 0) throw ErrnoException("Cannot open " + path, errno);
if (::lockf(fd, F_TLOCK, 0) < 0) throw ErrnoException("Cannot lock " + path, errno);
}
~LockFile() {
if (fd >= 0) {
(void) ::lockf(fd, F_ULOCK, 0); // Suppress warnings about ignoring return value.
::close(fd);
}
}
std::string path;
int fd;
bool created;
};
}
}
#endif /*!_sys_posix_LockFile_h*/
|
