code.delx.au - pulseaudio/blob - src/pulsecore/rtkit.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   Copyright 2009 Lennart Poettering
   5   Copyright 2010 David Henningsson <diwic@ubuntu.com>
   6
   7   Permission is hereby granted, free of charge, to any person
   8   obtaining a copy of this software and associated documentation files
   9   (the "Software"), to deal in the Software without restriction,
  10   including without limitation the rights to use, copy, modify, merge,
  11   publish, distribute, sublicense, and/or sell copies of the Software,
  12   and to permit persons to whom the Software is furnished to do so,
  13   subject to the following conditions:
  14
  15   The above copyright notice and this permission notice shall be
  16   included in all copies or substantial portions of the Software.
  17
  18   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  22   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  23   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  25   SOFTWARE.
  26 ***/
  27
  28 #include <errno.h>
  29
  30 #include "rtkit.h"
  31
  32 #if defined(__linux__) && !defined(__ANDROID__)
  33
  34 #ifndef _GNU_SOURCE
  35 #define _GNU_SOURCE
  36 #endif
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include <config.h>
  40 #endif
  41
  42 #include <string.h>
  43 #include <unistd.h>
  44 #include <sys/types.h>
  45 #include <sys/syscall.h>
  46 #include <pulsecore/core-util.h>
  47
  48 static pid_t _gettid(void) {
  49         return (pid_t) syscall(SYS_gettid);
  50 }
  51
  52 static int translate_error(const char *name) {
  53         if (pa_streq(name, DBUS_ERROR_NO_MEMORY))
  54                 return -ENOMEM;
  55         if (pa_streq(name, DBUS_ERROR_SERVICE_UNKNOWN) ||
  56             pa_streq(name, DBUS_ERROR_NAME_HAS_NO_OWNER))
  57                 return -ENOENT;
  58         if (pa_streq(name, DBUS_ERROR_ACCESS_DENIED) ||
  59             pa_streq(name, DBUS_ERROR_AUTH_FAILED))
  60                 return -EACCES;
  61
  62         return -EIO;
  63 }
  64
  65 static long long rtkit_get_int_property(DBusConnection *connection, const char* propname, long long* propval) {
  66         DBusMessage *m = NULL, *r = NULL;
  67         DBusMessageIter iter, subiter;
  68         dbus_int64_t i64;
  69         dbus_int32_t i32;
  70         DBusError error;
  71         int current_type;
  72         long long ret;
  73         const char * interfacestr = "org.freedesktop.RealtimeKit1";
  74
  75         dbus_error_init(&error);
  76
  77         if (!(m = dbus_message_new_method_call(
  78                               RTKIT_SERVICE_NAME,
  79                               RTKIT_OBJECT_PATH,
  80                               "org.freedesktop.DBus.Properties",
  81                               "Get"))) {
  82                 ret = -ENOMEM;
  83                 goto finish;
  84         }
  85
  86         if (!dbus_message_append_args(
  87                             m,
  88                             DBUS_TYPE_STRING, &interfacestr,
  89                             DBUS_TYPE_STRING, &propname,
  90                             DBUS_TYPE_INVALID)) {
  91                 ret = -ENOMEM;
  92                 goto finish;
  93         }
  94
  95         if (!(r = dbus_connection_send_with_reply_and_block(connection, m, -1, &error))) {
  96                 ret = translate_error(error.name);
  97                 goto finish;
  98         }
  99
 100         if (dbus_set_error_from_message(&error, r)) {
 101                 ret = translate_error(error.name);
 102                 goto finish;
 103         }
 104
 105         ret = -EBADMSG;
 106         dbus_message_iter_init(r, &iter);
 107         while ((current_type = dbus_message_iter_get_arg_type (&iter)) != DBUS_TYPE_INVALID) {
 108
 109                 if (current_type == DBUS_TYPE_VARIANT) {
 110                         dbus_message_iter_recurse(&iter, &subiter);
 111
 112                         while ((current_type = dbus_message_iter_get_arg_type (&subiter)) != DBUS_TYPE_INVALID) {
 113
 114                                 if (current_type == DBUS_TYPE_INT32) {
 115                                         dbus_message_iter_get_basic(&subiter, &i32);
 116                                         *propval = i32;
 117                                         ret = 0;
 118                                 }
 119
 120                                 if (current_type == DBUS_TYPE_INT64) {
 121                                         dbus_message_iter_get_basic(&subiter, &i64);
 122                                         *propval = i64;
 123                                         ret = 0;
 124                                 }
 125
 126                                 dbus_message_iter_next (&subiter);
 127                          }
 128                 }
 129                 dbus_message_iter_next (&iter);
 130         }
 131
 132 finish:
 133
 134         if (m)
 135                 dbus_message_unref(m);
 136
 137         if (r)
 138                 dbus_message_unref(r);
 139
 140         dbus_error_free(&error);
 141
 142         return ret;
 143 }
 144
 145 int rtkit_get_max_realtime_priority(DBusConnection *connection) {
 146         long long retval;
 147         int err;
 148
 149         err = rtkit_get_int_property(connection, "MaxRealtimePriority", &retval);
 150         return err < 0 ? err : retval;
 151 }
 152
 153 int rtkit_get_min_nice_level(DBusConnection *connection, int* min_nice_level) {
 154         long long retval;
 155         int err;
 156
 157         err = rtkit_get_int_property(connection, "MinNiceLevel", &retval);
 158         if (err >= 0)
 159                 *min_nice_level = retval;
 160         return err;
 161 }
 162
 163 long long rtkit_get_rttime_usec_max(DBusConnection *connection) {
 164         long long retval;
 165         int err;
 166
 167         err = rtkit_get_int_property(connection, "RTTimeUSecMax", &retval);
 168         return err < 0 ? err : retval;
 169 }
 170
 171 int rtkit_make_realtime(DBusConnection *connection, pid_t thread, int priority) {
 172         DBusMessage *m = NULL, *r = NULL;
 173         dbus_uint64_t u64;
 174         dbus_uint32_t u32;
 175         DBusError error;
 176         int ret;
 177
 178         dbus_error_init(&error);
 179
 180         if (thread == 0)
 181                 thread = _gettid();
 182
 183         if (!(m = dbus_message_new_method_call(
 184                               RTKIT_SERVICE_NAME,
 185                               RTKIT_OBJECT_PATH,
 186                               "org.freedesktop.RealtimeKit1",
 187                               "MakeThreadRealtime"))) {
 188                 ret = -ENOMEM;
 189                 goto finish;
 190         }
 191
 192         u64 = (dbus_uint64_t) thread;
 193         u32 = (dbus_uint32_t) priority;
 194
 195         if (!dbus_message_append_args(
 196                             m,
 197                             DBUS_TYPE_UINT64, &u64,
 198                             DBUS_TYPE_UINT32, &u32,
 199                             DBUS_TYPE_INVALID)) {
 200                 ret = -ENOMEM;
 201                 goto finish;
 202         }
 203
 204         if (!(r = dbus_connection_send_with_reply_and_block(connection, m, -1, &error))) {
 205                 ret = translate_error(error.name);
 206                 goto finish;
 207         }
 208
 209
 210         if (dbus_set_error_from_message(&error, r)) {
 211                 ret = translate_error(error.name);
 212                 goto finish;
 213         }
 214
 215         ret = 0;
 216
 217 finish:
 218
 219         if (m)
 220                 dbus_message_unref(m);
 221
 222         if (r)
 223                 dbus_message_unref(r);
 224
 225         dbus_error_free(&error);
 226
 227         return ret;
 228 }
 229
 230 int rtkit_make_high_priority(DBusConnection *connection, pid_t thread, int nice_level) {
 231         DBusMessage *m = NULL, *r = NULL;
 232         dbus_uint64_t u64;
 233         dbus_int32_t s32;
 234         DBusError error;
 235         int ret;
 236
 237         dbus_error_init(&error);
 238
 239         if (thread == 0)
 240                 thread = _gettid();
 241
 242         if (!(m = dbus_message_new_method_call(
 243                               RTKIT_SERVICE_NAME,
 244                               RTKIT_OBJECT_PATH,
 245                               "org.freedesktop.RealtimeKit1",
 246                               "MakeThreadHighPriority"))) {
 247                 ret = -ENOMEM;
 248                 goto finish;
 249         }
 250
 251         u64 = (dbus_uint64_t) thread;
 252         s32 = (dbus_int32_t) nice_level;
 253
 254         if (!dbus_message_append_args(
 255                             m,
 256                             DBUS_TYPE_UINT64, &u64,
 257                             DBUS_TYPE_INT32, &s32,
 258                             DBUS_TYPE_INVALID)) {
 259                 ret = -ENOMEM;
 260                 goto finish;
 261         }
 262
 263
 264
 265         if (!(r = dbus_connection_send_with_reply_and_block(connection, m, -1, &error))) {
 266                 ret = translate_error(error.name);
 267                 goto finish;
 268         }
 269
 270
 271         if (dbus_set_error_from_message(&error, r)) {
 272                 ret = translate_error(error.name);
 273                 goto finish;
 274         }
 275
 276         ret = 0;
 277
 278 finish:
 279
 280         if (m)
 281                 dbus_message_unref(m);
 282
 283         if (r)
 284                 dbus_message_unref(r);
 285
 286         dbus_error_free(&error);
 287
 288         return ret;
 289 }
 290
 291 #else
 292
 293 int rtkit_make_realtime(DBusConnection *connection, pid_t thread, int priority) {
 294         return -ENOTSUP;
 295 }
 296
 297 int rtkit_make_high_priority(DBusConnection *connection, pid_t thread, int nice_level) {
 298         return -ENOTSUP;
 299 }
 300
 301 int rtkit_get_max_realtime_priority(DBusConnection *connection) {
 302         return -ENOTSUP;
 303 }
 304
 305 int rtkit_get_min_nice_level(DBusConnection *connection, int* min_nice_level) {
 306         return -ENOTSUP;
 307 }
 308
 309 long long rtkit_get_rttime_usec_max(DBusConnection *connection) {
 310         return -ENOTSUP;
 311 }
 312
 313 #endif