The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.os; |
| 18 | |
| 19 | import android.net.LocalSocketAddress; |
| 20 | import android.net.LocalSocket; |
| 21 | import android.util.Log; |
| 22 | import dalvik.system.Zygote; |
| 23 | |
| 24 | import java.io.BufferedWriter; |
| 25 | import java.io.DataInputStream; |
| 26 | import java.io.IOException; |
| 27 | import java.io.OutputStreamWriter; |
| 28 | import java.util.ArrayList; |
| 29 | |
| 30 | /*package*/ class ZygoteStartFailedEx extends Exception { |
| 31 | /** |
| 32 | * Something prevented the zygote process startup from happening normally |
| 33 | */ |
| 34 | |
| 35 | ZygoteStartFailedEx() {}; |
| 36 | ZygoteStartFailedEx(String s) {super(s);} |
| 37 | ZygoteStartFailedEx(Throwable cause) {super(cause);} |
| 38 | } |
| 39 | |
| 40 | /** |
| 41 | * Tools for managing OS processes. |
| 42 | */ |
| 43 | public class Process { |
| 44 | private static final String LOG_TAG = "Process"; |
| 45 | |
| 46 | private static final String ZYGOTE_SOCKET = "zygote"; |
| 47 | |
| 48 | /** |
| 49 | * Name of a process for running the platform's media services. |
| 50 | * {@hide} |
| 51 | */ |
| 52 | public static final String ANDROID_SHARED_MEDIA = "com.android.process.media"; |
| 53 | |
| 54 | /** |
| 55 | * Name of the process that Google content providers can share. |
| 56 | * {@hide} |
| 57 | */ |
| 58 | public static final String GOOGLE_SHARED_APP_CONTENT = "com.google.process.content"; |
| 59 | |
| 60 | /** |
| 61 | * Defines the UID/GID under which system code runs. |
| 62 | */ |
| 63 | public static final int SYSTEM_UID = 1000; |
| 64 | |
| 65 | /** |
| 66 | * Defines the UID/GID under which the telephony code runs. |
| 67 | */ |
| 68 | public static final int PHONE_UID = 1001; |
| 69 | |
| 70 | /** |
| 71 | * Defines the start of a range of UIDs (and GIDs), going from this |
| 72 | * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning |
| 73 | * to applications. |
| 74 | */ |
| 75 | public static final int FIRST_APPLICATION_UID = 10000; |
| 76 | /** |
| 77 | * Last of application-specific UIDs starting at |
| 78 | * {@link #FIRST_APPLICATION_UID}. |
| 79 | */ |
| 80 | public static final int LAST_APPLICATION_UID = 99999; |
| 81 | |
| 82 | /** |
| 83 | * Defines a secondary group id for access to the bluetooth hardware. |
| 84 | */ |
| 85 | public static final int BLUETOOTH_GID = 2000; |
| 86 | |
| 87 | /** |
| 88 | * Standard priority of application threads. |
| 89 | * Use with {@link #setThreadPriority(int)} and |
| 90 | * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| 91 | * {@link java.lang.Thread} class. |
| 92 | */ |
| 93 | public static final int THREAD_PRIORITY_DEFAULT = 0; |
| 94 | |
| 95 | /* |
| 96 | * *************************************** |
| 97 | * ** Keep in sync with utils/threads.h ** |
| 98 | * *************************************** |
| 99 | */ |
| 100 | |
| 101 | /** |
| 102 | * Lowest available thread priority. Only for those who really, really |
| 103 | * don't want to run if anything else is happening. |
| 104 | * Use with {@link #setThreadPriority(int)} and |
| 105 | * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| 106 | * {@link java.lang.Thread} class. |
| 107 | */ |
| 108 | public static final int THREAD_PRIORITY_LOWEST = 19; |
| 109 | |
| 110 | /** |
| 111 | * Standard priority background threads. This gives your thread a slightly |
| 112 | * lower than normal priority, so that it will have less chance of impacting |
| 113 | * the responsiveness of the user interface. |
| 114 | * Use with {@link #setThreadPriority(int)} and |
| 115 | * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| 116 | * {@link java.lang.Thread} class. |
| 117 | */ |
| 118 | public static final int THREAD_PRIORITY_BACKGROUND = 10; |
| 119 | |
| 120 | /** |
| 121 | * Standard priority of threads that are currently running a user interface |
| 122 | * that the user is interacting with. Applications can not normally |
| 123 | * change to this priority; the system will automatically adjust your |
| 124 | * application threads as the user moves through the UI. |
| 125 | * Use with {@link #setThreadPriority(int)} and |
| 126 | * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| 127 | * {@link java.lang.Thread} class. |
| 128 | */ |
| 129 | public static final int THREAD_PRIORITY_FOREGROUND = -2; |
| 130 | |
| 131 | /** |
| 132 | * Standard priority of system display threads, involved in updating |
| 133 | * the user interface. Applications can not |
| 134 | * normally change to this priority. |
| 135 | * Use with {@link #setThreadPriority(int)} and |
| 136 | * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| 137 | * {@link java.lang.Thread} class. |
| 138 | */ |
| 139 | public static final int THREAD_PRIORITY_DISPLAY = -4; |
| 140 | |
| 141 | /** |
| 142 | * Standard priority of the most important display threads, for compositing |
| 143 | * the screen and retrieving input events. Applications can not normally |
| 144 | * change to this priority. |
| 145 | * Use with {@link #setThreadPriority(int)} and |
| 146 | * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| 147 | * {@link java.lang.Thread} class. |
| 148 | */ |
| 149 | public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; |
| 150 | |
| 151 | /** |
| 152 | * Standard priority of audio threads. Applications can not normally |
| 153 | * change to this priority. |
| 154 | * Use with {@link #setThreadPriority(int)} and |
| 155 | * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| 156 | * {@link java.lang.Thread} class. |
| 157 | */ |
| 158 | public static final int THREAD_PRIORITY_AUDIO = -16; |
| 159 | |
| 160 | /** |
| 161 | * Standard priority of the most important audio threads. |
| 162 | * Applications can not normally change to this priority. |
| 163 | * Use with {@link #setThreadPriority(int)} and |
| 164 | * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| 165 | * {@link java.lang.Thread} class. |
| 166 | */ |
| 167 | public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; |
| 168 | |
| 169 | /** |
| 170 | * Minimum increment to make a priority more favorable. |
| 171 | */ |
| 172 | public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; |
| 173 | |
| 174 | /** |
| 175 | * Minimum increment to make a priority less favorable. |
| 176 | */ |
| 177 | public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; |
| 178 | |
| 179 | public static final int SIGNAL_QUIT = 3; |
| 180 | public static final int SIGNAL_KILL = 9; |
| 181 | public static final int SIGNAL_USR1 = 10; |
| 182 | |
| 183 | // State for communicating with zygote process |
| 184 | |
| 185 | static LocalSocket sZygoteSocket; |
| 186 | static DataInputStream sZygoteInputStream; |
| 187 | static BufferedWriter sZygoteWriter; |
| 188 | |
| 189 | /** true if previous zygote open failed */ |
| 190 | static boolean sPreviousZygoteOpenFailed; |
| 191 | |
| 192 | /** |
| 193 | * Start a new process. |
| 194 | * |
| 195 | * <p>If processes are enabled, a new process is created and the |
| 196 | * static main() function of a <var>processClass</var> is executed there. |
| 197 | * The process will continue running after this function returns. |
| 198 | * |
| 199 | * <p>If processes are not enabled, a new thread in the caller's |
| 200 | * process is created and main() of <var>processClass</var> called there. |
| 201 | * |
| 202 | * <p>The niceName parameter, if not an empty string, is a custom name to |
| 203 | * give to the process instead of using processClass. This allows you to |
| 204 | * make easily identifyable processes even if you are using the same base |
| 205 | * <var>processClass</var> to start them. |
| 206 | * |
| 207 | * @param processClass The class to use as the process's main entry |
| 208 | * point. |
| 209 | * @param niceName A more readable name to use for the process. |
| 210 | * @param uid The user-id under which the process will run. |
| 211 | * @param gid The group-id under which the process will run. |
| 212 | * @param gids Additional group-ids associated with the process. |
| 213 | * @param enableDebugger True if debugging should be enabled for this process. |
| 214 | * @param zygoteArgs Additional arguments to supply to the zygote process. |
| 215 | * |
| 216 | * @return int If > 0 the pid of the new process; if 0 the process is |
| 217 | * being emulated by a thread |
| 218 | * @throws RuntimeException on fatal start failure |
| 219 | * |
| 220 | * {@hide} |
| 221 | */ |
| 222 | public static final int start(final String processClass, |
| 223 | final String niceName, |
| 224 | int uid, int gid, int[] gids, |
| 225 | int debugFlags, |
| 226 | String[] zygoteArgs) |
| 227 | { |
| 228 | if (supportsProcesses()) { |
| 229 | try { |
| 230 | return startViaZygote(processClass, niceName, uid, gid, gids, |
| 231 | debugFlags, zygoteArgs); |
| 232 | } catch (ZygoteStartFailedEx ex) { |
| 233 | Log.e(LOG_TAG, |
| 234 | "Starting VM process through Zygote failed"); |
| 235 | throw new RuntimeException( |
| 236 | "Starting VM process through Zygote failed", ex); |
| 237 | } |
| 238 | } else { |
| 239 | // Running in single-process mode |
| 240 | |
| 241 | Runnable runnable = new Runnable() { |
| 242 | public void run() { |
| 243 | Process.invokeStaticMain(processClass); |
| 244 | } |
| 245 | }; |
| 246 | |
| 247 | // Thread constructors must not be called with null names (see spec). |
| 248 | if (niceName != null) { |
| 249 | new Thread(runnable, niceName).start(); |
| 250 | } else { |
| 251 | new Thread(runnable).start(); |
| 252 | } |
| 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Start a new process. Don't supply a custom nice name. |
| 260 | * {@hide} |
| 261 | */ |
| 262 | public static final int start(String processClass, int uid, int gid, |
| 263 | int[] gids, int debugFlags, String[] zygoteArgs) { |
| 264 | return start(processClass, "", uid, gid, gids, |
| 265 | debugFlags, zygoteArgs); |
| 266 | } |
| 267 | |
| 268 | private static void invokeStaticMain(String className) { |
| 269 | Class cl; |
| 270 | Object args[] = new Object[1]; |
| 271 | |
| 272 | args[0] = new String[0]; //this is argv |
| 273 | |
| 274 | try { |
| 275 | cl = Class.forName(className); |
| 276 | cl.getMethod("main", new Class[] { String[].class }) |
| 277 | .invoke(null, args); |
| 278 | } catch (Exception ex) { |
| 279 | // can be: ClassNotFoundException, |
| 280 | // NoSuchMethodException, SecurityException, |
| 281 | // IllegalAccessException, IllegalArgumentException |
| 282 | // InvocationTargetException |
| 283 | // or uncaught exception from main() |
| 284 | |
| 285 | Log.e(LOG_TAG, "Exception invoking static main on " |
| 286 | + className, ex); |
| 287 | |
| 288 | throw new RuntimeException(ex); |
| 289 | } |
| 290 | |
| 291 | } |
| 292 | |
| 293 | /** retry interval for opening a zygote socket */ |
| 294 | static final int ZYGOTE_RETRY_MILLIS = 500; |
| 295 | |
| 296 | /** |
| 297 | * Tries to open socket to Zygote process if not already open. If |
| 298 | * already open, does nothing. May block and retry. |
| 299 | */ |
| 300 | private static void openZygoteSocketIfNeeded() |
| 301 | throws ZygoteStartFailedEx { |
| 302 | |
| 303 | int retryCount; |
| 304 | |
| 305 | if (sPreviousZygoteOpenFailed) { |
| 306 | /* |
| 307 | * If we've failed before, expect that we'll fail again and |
| 308 | * don't pause for retries. |
| 309 | */ |
| 310 | retryCount = 0; |
| 311 | } else { |
| 312 | retryCount = 10; |
| 313 | } |
| 314 | |
| 315 | /* |
| 316 | * See bug #811181: Sometimes runtime can make it up before zygote. |
| 317 | * Really, we'd like to do something better to avoid this condition, |
| 318 | * but for now just wait a bit... |
| 319 | */ |
| 320 | for (int retry = 0 |
| 321 | ; (sZygoteSocket == null) && (retry < (retryCount + 1)) |
| 322 | ; retry++ ) { |
| 323 | |
| 324 | if (retry > 0) { |
| 325 | try { |
| 326 | Log.i("Zygote", "Zygote not up yet, sleeping..."); |
| 327 | Thread.sleep(ZYGOTE_RETRY_MILLIS); |
| 328 | } catch (InterruptedException ex) { |
| 329 | // should never happen |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | try { |
| 334 | sZygoteSocket = new LocalSocket(); |
| 335 | |
| 336 | sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, |
| 337 | LocalSocketAddress.Namespace.RESERVED)); |
| 338 | |
| 339 | sZygoteInputStream |
| 340 | = new DataInputStream(sZygoteSocket.getInputStream()); |
| 341 | |
| 342 | sZygoteWriter = |
| 343 | new BufferedWriter( |
| 344 | new OutputStreamWriter( |
| 345 | sZygoteSocket.getOutputStream()), |
| 346 | 256); |
| 347 | |
| 348 | Log.i("Zygote", "Process: zygote socket opened"); |
| 349 | |
| 350 | sPreviousZygoteOpenFailed = false; |
| 351 | break; |
| 352 | } catch (IOException ex) { |
| 353 | if (sZygoteSocket != null) { |
| 354 | try { |
| 355 | sZygoteSocket.close(); |
| 356 | } catch (IOException ex2) { |
| 357 | Log.e(LOG_TAG,"I/O exception on close after exception", |
| 358 | ex2); |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | sZygoteSocket = null; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | if (sZygoteSocket == null) { |
| 367 | sPreviousZygoteOpenFailed = true; |
| 368 | throw new ZygoteStartFailedEx("connect failed"); |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | /** |
| 373 | * Sends an argument list to the zygote process, which starts a new child |
| 374 | * and returns the child's pid. Please note: the present implementation |
| 375 | * replaces newlines in the argument list with spaces. |
| 376 | * @param args argument list |
| 377 | * @return PID of new child process |
| 378 | * @throws ZygoteStartFailedEx if process start failed for any reason |
| 379 | */ |
| 380 | private static int zygoteSendArgsAndGetPid(ArrayList<String> args) |
| 381 | throws ZygoteStartFailedEx { |
| 382 | |
| 383 | int pid; |
| 384 | |
| 385 | openZygoteSocketIfNeeded(); |
| 386 | |
| 387 | try { |
| 388 | /** |
| 389 | * See com.android.internal.os.ZygoteInit.readArgumentList() |
| 390 | * Presently the wire format to the zygote process is: |
| 391 | * a) a count of arguments (argc, in essence) |
| 392 | * b) a number of newline-separated argument strings equal to count |
| 393 | * |
| 394 | * After the zygote process reads these it will write the pid of |
| 395 | * the child or -1 on failure. |
| 396 | */ |
| 397 | |
| 398 | sZygoteWriter.write(Integer.toString(args.size())); |
| 399 | sZygoteWriter.newLine(); |
| 400 | |
| 401 | int sz = args.size(); |
| 402 | for (int i = 0; i < sz; i++) { |
| 403 | String arg = args.get(i); |
| 404 | if (arg.indexOf('\n') >= 0) { |
| 405 | throw new ZygoteStartFailedEx( |
| 406 | "embedded newlines not allowed"); |
| 407 | } |
| 408 | sZygoteWriter.write(arg); |
| 409 | sZygoteWriter.newLine(); |
| 410 | } |
| 411 | |
| 412 | sZygoteWriter.flush(); |
| 413 | |
| 414 | // Should there be a timeout on this? |
| 415 | pid = sZygoteInputStream.readInt(); |
| 416 | |
| 417 | if (pid < 0) { |
| 418 | throw new ZygoteStartFailedEx("fork() failed"); |
| 419 | } |
| 420 | } catch (IOException ex) { |
| 421 | try { |
| 422 | if (sZygoteSocket != null) { |
| 423 | sZygoteSocket.close(); |
| 424 | } |
| 425 | } catch (IOException ex2) { |
| 426 | // we're going to fail anyway |
| 427 | Log.e(LOG_TAG,"I/O exception on routine close", ex2); |
| 428 | } |
| 429 | |
| 430 | sZygoteSocket = null; |
| 431 | |
| 432 | throw new ZygoteStartFailedEx(ex); |
| 433 | } |
| 434 | |
| 435 | return pid; |
| 436 | } |
| 437 | |
| 438 | /** |
| 439 | * Starts a new process via the zygote mechanism. |
| 440 | * |
| 441 | * @param processClass Class name whose static main() to run |
| 442 | * @param niceName 'nice' process name to appear in ps |
| 443 | * @param uid a POSIX uid that the new process should setuid() to |
| 444 | * @param gid a POSIX gid that the new process shuold setgid() to |
| 445 | * @param gids null-ok; a list of supplementary group IDs that the |
| 446 | * new process should setgroup() to. |
| 447 | * @param enableDebugger True if debugging should be enabled for this process. |
| 448 | * @param extraArgs Additional arguments to supply to the zygote process. |
| 449 | * @return PID |
| 450 | * @throws ZygoteStartFailedEx if process start failed for any reason |
| 451 | */ |
| 452 | private static int startViaZygote(final String processClass, |
| 453 | final String niceName, |
| 454 | final int uid, final int gid, |
| 455 | final int[] gids, |
| 456 | int debugFlags, |
| 457 | String[] extraArgs) |
| 458 | throws ZygoteStartFailedEx { |
| 459 | int pid; |
| 460 | |
| 461 | synchronized(Process.class) { |
| 462 | ArrayList<String> argsForZygote = new ArrayList<String>(); |
| 463 | |
| 464 | // --runtime-init, --setuid=, --setgid=, |
| 465 | // and --setgroups= must go first |
| 466 | argsForZygote.add("--runtime-init"); |
| 467 | argsForZygote.add("--setuid=" + uid); |
| 468 | argsForZygote.add("--setgid=" + gid); |
| 469 | if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { |
| 470 | argsForZygote.add("--enable-debugger"); |
| 471 | } |
| 472 | if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { |
| 473 | argsForZygote.add("--enable-checkjni"); |
| 474 | } |
| 475 | if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { |
| 476 | argsForZygote.add("--enable-assert"); |
| 477 | } |
| 478 | |
| 479 | //TODO optionally enable debuger |
| 480 | //argsForZygote.add("--enable-debugger"); |
| 481 | |
| 482 | // --setgroups is a comma-separated list |
| 483 | if (gids != null && gids.length > 0) { |
| 484 | StringBuilder sb = new StringBuilder(); |
| 485 | sb.append("--setgroups="); |
| 486 | |
| 487 | int sz = gids.length; |
| 488 | for (int i = 0; i < sz; i++) { |
| 489 | if (i != 0) { |
| 490 | sb.append(','); |
| 491 | } |
| 492 | sb.append(gids[i]); |
| 493 | } |
| 494 | |
| 495 | argsForZygote.add(sb.toString()); |
| 496 | } |
| 497 | |
| 498 | if (niceName != null) { |
| 499 | argsForZygote.add("--nice-name=" + niceName); |
| 500 | } |
| 501 | |
| 502 | argsForZygote.add(processClass); |
| 503 | |
| 504 | if (extraArgs != null) { |
| 505 | for (String arg : extraArgs) { |
| 506 | argsForZygote.add(arg); |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | pid = zygoteSendArgsAndGetPid(argsForZygote); |
| 511 | } |
| 512 | |
| 513 | if (pid <= 0) { |
| 514 | throw new ZygoteStartFailedEx("zygote start failed:" + pid); |
| 515 | } |
| 516 | |
| 517 | return pid; |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * Returns elapsed milliseconds of the time this process has run. |
| 522 | * @return Returns the number of milliseconds this process has return. |
| 523 | */ |
| 524 | public static final native long getElapsedCpuTime(); |
| 525 | |
| 526 | /** |
| 527 | * Returns the identifier of this process, which can be used with |
| 528 | * {@link #killProcess} and {@link #sendSignal}. |
| 529 | */ |
| 530 | public static final native int myPid(); |
| 531 | |
| 532 | /** |
| 533 | * Returns the identifier of the calling thread, which be used with |
| 534 | * {@link #setThreadPriority(int, int)}. |
| 535 | */ |
| 536 | public static final native int myTid(); |
| 537 | |
| 538 | /** |
| 539 | * Returns the identifier of this process's user. |
| 540 | */ |
| 541 | public static final native int myUid(); |
| 542 | |
| 543 | /** |
| 544 | * Returns the UID assigned to a particular user name, or -1 if there is |
| 545 | * none. If the given string consists of only numbers, it is converted |
| 546 | * directly to a uid. |
| 547 | */ |
| 548 | public static final native int getUidForName(String name); |
| 549 | |
| 550 | /** |
| 551 | * Returns the GID assigned to a particular user name, or -1 if there is |
| 552 | * none. If the given string consists of only numbers, it is converted |
| 553 | * directly to a gid. |
| 554 | */ |
| 555 | public static final native int getGidForName(String name); |
| 556 | |
| 557 | /** |
| 558 | * Set the priority of a thread, based on Linux priorities. |
| 559 | * |
| 560 | * @param tid The identifier of the thread/process to change. |
| 561 | * @param priority A Linux priority level, from -20 for highest scheduling |
| 562 | * priority to 19 for lowest scheduling priority. |
| 563 | * |
| 564 | * @throws IllegalArgumentException Throws IllegalArgumentException if |
| 565 | * <var>tid</var> does not exist. |
| 566 | * @throws SecurityException Throws SecurityException if your process does |
| 567 | * not have permission to modify the given thread, or to use the given |
| 568 | * priority. |
| 569 | */ |
| 570 | public static final native void setThreadPriority(int tid, int priority) |
| 571 | throws IllegalArgumentException, SecurityException; |
| 572 | |
| 573 | /** |
| 574 | * Set the priority of the calling thread, based on Linux priorities. See |
| 575 | * {@link #setThreadPriority(int, int)} for more information. |
| 576 | * |
| 577 | * @param priority A Linux priority level, from -20 for highest scheduling |
| 578 | * priority to 19 for lowest scheduling priority. |
| 579 | * |
| 580 | * @throws IllegalArgumentException Throws IllegalArgumentException if |
| 581 | * <var>tid</var> does not exist. |
| 582 | * @throws SecurityException Throws SecurityException if your process does |
| 583 | * not have permission to modify the given thread, or to use the given |
| 584 | * priority. |
| 585 | * |
| 586 | * @see #setThreadPriority(int, int) |
| 587 | */ |
| 588 | public static final native void setThreadPriority(int priority) |
| 589 | throws IllegalArgumentException, SecurityException; |
| 590 | |
| 591 | /** |
| 592 | * Return the current priority of a thread, based on Linux priorities. |
| 593 | * |
| 594 | * @param tid The identifier of the thread/process to change. |
| 595 | * |
| 596 | * @return Returns the current priority, as a Linux priority level, |
| 597 | * from -20 for highest scheduling priority to 19 for lowest scheduling |
| 598 | * priority. |
| 599 | * |
| 600 | * @throws IllegalArgumentException Throws IllegalArgumentException if |
| 601 | * <var>tid</var> does not exist. |
| 602 | */ |
| 603 | public static final native int getThreadPriority(int tid) |
| 604 | throws IllegalArgumentException; |
| 605 | |
| 606 | /** |
| 607 | * Determine whether the current environment supports multiple processes. |
| 608 | * |
| 609 | * @return Returns true if the system can run in multiple processes, else |
| 610 | * false if everything is running in a single process. |
| 611 | */ |
| 612 | public static final native boolean supportsProcesses(); |
| 613 | |
| 614 | /** |
| 615 | * Set the out-of-memory badness adjustment for a process. |
| 616 | * |
| 617 | * @param pid The process identifier to set. |
| 618 | * @param amt Adjustment value -- linux allows -16 to +15. |
| 619 | * |
| 620 | * @return Returns true if the underlying system supports this |
| 621 | * feature, else false. |
| 622 | * |
| 623 | * {@hide} |
| 624 | */ |
| 625 | public static final native boolean setOomAdj(int pid, int amt); |
| 626 | |
| 627 | /** |
| 628 | * Change this process's argv[0] parameter. This can be useful to show |
| 629 | * more descriptive information in things like the 'ps' command. |
| 630 | * |
| 631 | * @param text The new name of this process. |
| 632 | * |
| 633 | * {@hide} |
| 634 | */ |
| 635 | public static final native void setArgV0(String text); |
| 636 | |
| 637 | /** |
| 638 | * Kill the process with the given PID. |
| 639 | * Note that, though this API allows us to request to |
| 640 | * kill any process based on its PID, the kernel will |
| 641 | * still impose standard restrictions on which PIDs you |
| 642 | * are actually able to kill. Typically this means only |
| 643 | * the process running the caller's packages/application |
| 644 | * and any additional processes created by that app; packages |
| 645 | * sharing a common UID will also be able to kill each |
| 646 | * other's processes. |
| 647 | */ |
| 648 | public static final void killProcess(int pid) { |
| 649 | sendSignal(pid, SIGNAL_KILL); |
| 650 | } |
| 651 | |
| 652 | /** @hide */ |
| 653 | public static final native int setUid(int uid); |
| 654 | |
| 655 | /** @hide */ |
| 656 | public static final native int setGid(int uid); |
| 657 | |
| 658 | /** |
| 659 | * Send a signal to the given process. |
| 660 | * |
| 661 | * @param pid The pid of the target process. |
| 662 | * @param signal The signal to send. |
| 663 | */ |
| 664 | public static final native void sendSignal(int pid, int signal); |
| 665 | |
| 666 | /** @hide */ |
| 667 | public static final native int getFreeMemory(); |
| 668 | |
| 669 | /** @hide */ |
| 670 | public static final native void readProcLines(String path, |
| 671 | String[] reqFields, long[] outSizes); |
| 672 | |
| 673 | /** @hide */ |
| 674 | public static final native int[] getPids(String path, int[] lastArray); |
| 675 | |
| 676 | /** @hide */ |
| 677 | public static final int PROC_TERM_MASK = 0xff; |
| 678 | /** @hide */ |
| 679 | public static final int PROC_ZERO_TERM = 0; |
| 680 | /** @hide */ |
| 681 | public static final int PROC_SPACE_TERM = (int)' '; |
| 682 | /** @hide */ |
| 683 | public static final int PROC_COMBINE = 0x100; |
| 684 | /** @hide */ |
| 685 | public static final int PROC_PARENS = 0x200; |
| 686 | /** @hide */ |
| 687 | public static final int PROC_OUT_STRING = 0x1000; |
| 688 | /** @hide */ |
| 689 | public static final int PROC_OUT_LONG = 0x2000; |
| 690 | /** @hide */ |
| 691 | public static final int PROC_OUT_FLOAT = 0x4000; |
| 692 | |
| 693 | /** @hide */ |
| 694 | public static final native boolean readProcFile(String file, int[] format, |
| 695 | String[] outStrings, long[] outLongs, float[] outFloats); |
| 696 | |
| 697 | /** |
| 698 | * Gets the total Pss value for a given process, in bytes. |
| 699 | * |
| 700 | * @param pid the process to the Pss for |
| 701 | * @return the total Pss value for the given process in bytes, |
| 702 | * or -1 if the value cannot be determined |
| 703 | * @hide |
| 704 | */ |
| 705 | public static final native long getPss(int pid); |
| 706 | } |