blob: ef519b3d870fdfb42c4f5a01d9fde3a7cbcf3313 (
plain)
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
84
85
86
87
88
89
90
91
92
93
|
// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#include <config.h>
#include <util/pid_file.h>
#include <cstdio>
#include <signal.h>
#include <unistd.h>
#include <cerrno>
namespace isc {
namespace util {
PIDFile::PIDFile(const std::string& filename)
: filename_(filename) {
}
PIDFile::~PIDFile() {
}
int
PIDFile::check() const {
std::ifstream fs(filename_.c_str());
int pid;
bool good;
// If we weren't able to open the file treat
// it as if the process wasn't running
if (!fs.is_open()) {
return (false);
}
// Try to get the pid, get the status and get rid of the file
fs >> pid;
good = fs.good();
fs.close();
// If we weren't able to read a pid send back an exception
if (!good) {
isc_throw(PIDCantReadPID, "Unable to read PID from file '"
<< filename_ << "'");
}
// If the process is still running return its pid.
if (kill(pid, 0) == 0) {
return (pid);
}
// No process
return (0);
}
void
PIDFile::write() const {
write(getpid());
}
void
PIDFile::write(int pid) const {
std::ofstream fs(filename_.c_str(), std::ofstream::trunc);
if (!fs.is_open()) {
isc_throw(PIDFileError, "Unable to open PID file '"
<< filename_ << "' for write");
}
// File is open, write the pid.
fs << pid << std::endl;
bool good = fs.good();
fs.close();
if (!good) {
isc_throw(PIDFileError, "Unable to write to PID file '"
<< filename_ << "'");
}
}
void
PIDFile::deleteFile() const {
if ((remove(filename_.c_str()) != 0) &&
(errno != ENOENT)) {
isc_throw(PIDFileError, "Unable to delete PID file '"
<< filename_ << "'");
}
}
} // namespace isc::util
} // namespace isc
|
