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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/*
* Copyright Andrey Semashev 2007 - 2015.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
#include <string>
#include <iostream>
#include <stdexcept>
#include <boost/config.hpp>
#include <boost/smart_ptr/shared_ptr.hpp>
#include <boost/core/null_deleter.hpp>
#include <boost/log/core.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/sinks/sync_frontend.hpp>
#include <boost/log/sinks/text_ostream_backend.hpp>
#include <boost/log/sources/logger.hpp>
#include <boost/log/sources/record_ostream.hpp>
#include <boost/log/attributes/attribute.hpp>
#include <boost/log/attributes/attribute_value.hpp>
#include <boost/log/attributes/attribute_value_impl.hpp>
#include <boost/log/attributes/attribute_cast.hpp>
// Includes for get_uptime()
#include <boost/throw_exception.hpp>
#if defined(BOOST_WINDOWS)
#include <windows.h>
#elif defined(__linux__) || defined(__linux) || defined(linux)
#include <sys/sysinfo.h>
#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
#include <time.h>
#include <errno.h>
#include <sys/sysctl.h>
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#include <time.h>
#endif
namespace logging = boost::log;
namespace attrs = boost::log::attributes;
namespace src = boost::log::sources;
namespace expr = boost::log::expressions;
namespace sinks = boost::log::sinks;
namespace keywords = boost::log::keywords;
//[ example_extension_system_uptime_attr_impl
// The function returns the system uptime, in seconds
unsigned int get_uptime();
// Attribute implementation class
class system_uptime_impl :
public logging::attribute::impl
{
public:
// The method generates a new attribute value
logging::attribute_value get_value()
{
return attrs::make_attribute_value(get_uptime());
}
};
//]
//[ example_extension_system_uptime_attr
// Attribute interface class
class system_uptime :
public logging::attribute
{
public:
system_uptime() : logging::attribute(new system_uptime_impl())
{
}
// Attribute casting support
explicit system_uptime(attrs::cast_source const& source) : logging::attribute(source.as< system_uptime_impl >())
{
}
};
//]
//[ example_extension_system_uptime_use
void init_logging()
{
boost::shared_ptr< logging::core > core = logging::core::get();
//<-
// Initialize the sink
typedef sinks::synchronous_sink< sinks::text_ostream_backend > sink_t;
boost::shared_ptr< sink_t > sink(new sink_t());
sink->locked_backend()->add_stream(boost::shared_ptr< std::ostream >(&std::clog, boost::null_deleter()));
sink->set_formatter(expr::stream << expr::attr< unsigned int >("SystemUptime") << ": " << expr::smessage);
core->add_sink(sink);
//->
// ...
// Add the uptime attribute to the core
core->add_global_attribute("SystemUptime", system_uptime());
}
//]
unsigned int get_uptime()
{
#if defined(BOOST_WINDOWS)
return GetTickCount() / 1000u;
#elif defined(__linux__) || defined(__linux) || defined(linux)
struct sysinfo info;
if (sysinfo(&info) != 0)
BOOST_THROW_EXCEPTION(std::runtime_error("Could not acquire uptime"));
return info.uptime;
#elif defined(macintosh) || defined(__APPLE__) || defined(__APPLE_CC__)
struct timeval boottime;
std::size_t len = sizeof(boottime);
int mib[2] = { CTL_KERN, KERN_BOOTTIME };
if (sysctl(mib, 2, &boottime, &len, NULL, 0) < 0)
BOOST_THROW_EXCEPTION(std::runtime_error("Could not acquire uptime"));
return time(NULL) - boottime.tv_sec;
#elif (defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)) && defined(CLOCK_UPTIME)
struct timespec ts;
if (clock_gettime(CLOCK_UPTIME, &ts) != 0)
BOOST_THROW_EXCEPTION(std::runtime_error("Could not acquire uptime"));
return ts.tv_sec;
#else
return 0;
#endif
}
int main(int, char*[])
{
init_logging();
src::logger lg;
BOOST_LOG(lg) << "Hello, world with uptime!";
return 0;
}
|
