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
|
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 "Exception.h"
#include "DataDir.h"
#include "qpid/log/Statement.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <fcntl.h>
#include <cerrno>
namespace qpid {
DataDir::DataDir (std::string path) :
enabled (!path.empty ()),
dirPath (path),
dirFd(-1)
{
if (!enabled)
{
QPID_LOG (info, "No data directory - Disabling persistent configuration");
return;
}
const char *cpath = dirPath.c_str ();
struct stat s;
if (::stat(cpath, &s)) {
if (errno == ENOENT) {
if (::mkdir(cpath, 0755))
throw Exception ("Can't create data directory: " + path);
}
else
throw Exception ("Data directory not found: " + path);
}
int dirFd = ::open(path.c_str(), 0);
if (dirFd == -1)
throw Exception(QPID_MSG("Can't open data directory: " << dirPath << ": " << strError(errno)));
int result = ::flock(dirFd, LOCK_EX | LOCK_NB);
if (result != 0) {
if (errno == EWOULDBLOCK)
throw Exception(QPID_MSG("Data directory locked by another process: " << path));
throw Exception(QPID_MSG("Cannot lock data directory: " << strError(errno)));
}
QPID_LOG (info, "Locked data directory: " << dirPath);
}
DataDir::~DataDir () {
if (dirFd != -1) {
::close(dirFd); // Closing the fd unlocks the directory.
QPID_LOG (info, "Unlocked data directory: " << dirPath);
}
}
} // namespace qpid
|
