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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
Copyright 2009 Lennart Poettering
Copyright 2010 David Henningsson <diwic@ubuntu.com>
Copyright 2021 Chris Robinson
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
***/
#include "config.h"
#include "rtkit.h"
#include <cerrno>
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <memory>
#include <cstring>
#include <unistd.h>
#include <sys/types.h>
#ifdef __linux__
#include <sys/syscall.h>
#elif defined(__FreeBSD__)
#include <sys/thr.h>
#endif
namespace dbus {
constexpr int TypeString{'s'};
constexpr int TypeVariant{'v'};
constexpr int TypeInt32{'i'};
constexpr int TypeUInt32{'u'};
constexpr int TypeInt64{'x'};
constexpr int TypeUInt64{'t'};
constexpr int TypeInvalid{'\0'};
struct MessageDeleter {
void operator()(DBusMessage *m) { dbus_message_unref(m); }
};
using MessagePtr = std::unique_ptr<DBusMessage,MessageDeleter>;
} // namespace dbus
namespace {
inline pid_t _gettid()
{
#ifdef __linux__
return static_cast<pid_t>(syscall(SYS_gettid));
#elif defined(__FreeBSD__)
long pid{};
thr_self(&pid);
return static_cast<pid_t>(pid);
#else
#warning gettid not available
return 0;
#endif
}
int translate_error(const char *name)
{
if(strcmp(name, DBUS_ERROR_NO_MEMORY) == 0)
return -ENOMEM;
if(strcmp(name, DBUS_ERROR_SERVICE_UNKNOWN) == 0
|| strcmp(name, DBUS_ERROR_NAME_HAS_NO_OWNER) == 0)
return -ENOENT;
if(strcmp(name, DBUS_ERROR_ACCESS_DENIED) == 0
|| strcmp(name, DBUS_ERROR_AUTH_FAILED) == 0)
return -EACCES;
return -EIO;
}
int rtkit_get_int_property(DBusConnection *connection, const char *propname, long long *propval)
{
dbus::MessagePtr m{dbus_message_new_method_call(RTKIT_SERVICE_NAME, RTKIT_OBJECT_PATH,
"org.freedesktop.DBus.Properties", "Get")};
if(!m) return -ENOMEM;
const char *interfacestr = RTKIT_SERVICE_NAME;
auto ready = dbus_message_append_args(m.get(),
dbus::TypeString, &interfacestr,
dbus::TypeString, &propname,
dbus::TypeInvalid);
if(!ready) return -ENOMEM;
dbus::Error error;
dbus::MessagePtr r{dbus_connection_send_with_reply_and_block(connection, m.get(), -1,
&error.get())};
if(!r) return translate_error(error->name);
if(dbus_set_error_from_message(&error.get(), r.get()))
return translate_error(error->name);
int ret{-EBADMSG};
DBusMessageIter iter{};
dbus_message_iter_init(r.get(), &iter);
while(int curtype{dbus_message_iter_get_arg_type(&iter)})
{
if(curtype == dbus::TypeVariant)
{
DBusMessageIter subiter{};
dbus_message_iter_recurse(&iter, &subiter);
while((curtype=dbus_message_iter_get_arg_type(&subiter)) != dbus::TypeInvalid)
{
if(curtype == dbus::TypeInt32)
{
dbus_int32_t i32{};
dbus_message_iter_get_basic(&subiter, &i32);
*propval = i32;
ret = 0;
}
if(curtype == dbus::TypeInt64)
{
dbus_int64_t i64{};
dbus_message_iter_get_basic(&subiter, &i64);
*propval = i64;
ret = 0;
}
dbus_message_iter_next(&subiter);
}
}
dbus_message_iter_next(&iter);
}
return ret;
}
} // namespace
int rtkit_get_max_realtime_priority(DBusConnection *connection)
{
long long retval{};
int err{rtkit_get_int_property(connection, "MaxRealtimePriority", &retval)};
return err < 0 ? err : static_cast<int>(retval);
}
int rtkit_get_min_nice_level(DBusConnection *connection, int *min_nice_level)
{
long long retval{};
int err{rtkit_get_int_property(connection, "MinNiceLevel", &retval)};
if(err >= 0) *min_nice_level = static_cast<int>(retval);
return err;
}
long long rtkit_get_rttime_usec_max(DBusConnection *connection)
{
long long retval{};
int err{rtkit_get_int_property(connection, "RTTimeUSecMax", &retval)};
return err < 0 ? err : retval;
}
int rtkit_make_realtime(DBusConnection *connection, pid_t thread, int priority)
{
if(thread == 0)
thread = _gettid();
if(thread == 0)
return -ENOTSUP;
dbus::MessagePtr m{dbus_message_new_method_call(RTKIT_SERVICE_NAME, RTKIT_OBJECT_PATH,
"org.freedesktop.RealtimeKit1", "MakeThreadRealtime")};
if(!m) return -ENOMEM;
auto u64 = static_cast<dbus_uint64_t>(thread);
auto u32 = static_cast<dbus_uint32_t>(priority);
auto ready = dbus_message_append_args(m.get(),
dbus::TypeUInt64, &u64,
dbus::TypeUInt32, &u32,
dbus::TypeInvalid);
if(!ready) return -ENOMEM;
dbus::Error error;
dbus::MessagePtr r{dbus_connection_send_with_reply_and_block(connection, m.get(), -1,
&error.get())};
if(!r) return translate_error(error->name);
if(dbus_set_error_from_message(&error.get(), r.get()))
return translate_error(error->name);
return 0;
}
int rtkit_make_high_priority(DBusConnection *connection, pid_t thread, int nice_level)
{
if(thread == 0)
thread = _gettid();
if(thread == 0)
return -ENOTSUP;
dbus::MessagePtr m{dbus_message_new_method_call(RTKIT_SERVICE_NAME, RTKIT_OBJECT_PATH,
"org.freedesktop.RealtimeKit1", "MakeThreadHighPriority")};
if(!m) return -ENOMEM;
auto u64 = static_cast<dbus_uint64_t>(thread);
auto s32 = static_cast<dbus_int32_t>(nice_level);
auto ready = dbus_message_append_args(m.get(),
dbus::TypeUInt64, &u64,
dbus::TypeInt32, &s32,
dbus::TypeInvalid);
if(!ready) return -ENOMEM;
dbus::Error error;
dbus::MessagePtr r{dbus_connection_send_with_reply_and_block(connection, m.get(), -1,
&error.get())};
if(!r) return translate_error(error->name);
if(dbus_set_error_from_message(&error.get(), r.get()))
return translate_error(error->name);
return 0;
}
|
