Process.java revision ee0cdce2a80f8cc033378134e37092bc467c0f38
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 17package android.os; 18 19import android.net.LocalSocket; 20import android.net.LocalSocketAddress; 21import android.system.Os; 22import android.util.Log; 23import com.android.internal.os.Zygote; 24import dalvik.system.VMRuntime; 25import java.io.BufferedWriter; 26import java.io.DataInputStream; 27import java.io.IOException; 28import java.io.OutputStreamWriter; 29import java.nio.charset.StandardCharsets; 30import java.util.ArrayList; 31import java.util.Arrays; 32import java.util.List; 33 34/*package*/ class ZygoteStartFailedEx extends Exception { 35 ZygoteStartFailedEx(String s) { 36 super(s); 37 } 38 39 ZygoteStartFailedEx(Throwable cause) { 40 super(cause); 41 } 42 43 ZygoteStartFailedEx(String s, Throwable cause) { 44 super(s, cause); 45 } 46} 47 48/** 49 * Tools for managing OS processes. 50 */ 51public class Process { 52 private static final String LOG_TAG = "Process"; 53 54 /** 55 * @hide for internal use only. 56 */ 57 public static final String ZYGOTE_SOCKET = "zygote"; 58 59 /** 60 * @hide for internal use only. 61 */ 62 public static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary"; 63 64 /** 65 * Defines the root UID. 66 * @hide 67 */ 68 public static final int ROOT_UID = 0; 69 70 /** 71 * Defines the UID/GID under which system code runs. 72 */ 73 public static final int SYSTEM_UID = 1000; 74 75 /** 76 * Defines the UID/GID under which the telephony code runs. 77 */ 78 public static final int PHONE_UID = 1001; 79 80 /** 81 * Defines the UID/GID for the user shell. 82 * @hide 83 */ 84 public static final int SHELL_UID = 2000; 85 86 /** 87 * Defines the UID/GID for the log group. 88 * @hide 89 */ 90 public static final int LOG_UID = 1007; 91 92 /** 93 * Defines the UID/GID for the WIFI supplicant process. 94 * @hide 95 */ 96 public static final int WIFI_UID = 1010; 97 98 /** 99 * Defines the UID/GID for the mediaserver process. 100 * @hide 101 */ 102 public static final int MEDIA_UID = 1013; 103 104 /** 105 * Defines the UID/GID for the DRM process. 106 * @hide 107 */ 108 public static final int DRM_UID = 1019; 109 110 /** 111 * Defines the UID/GID for the group that controls VPN services. 112 * @hide 113 */ 114 public static final int VPN_UID = 1016; 115 116 /** 117 * Defines the UID/GID for the NFC service process. 118 * @hide 119 */ 120 public static final int NFC_UID = 1027; 121 122 /** 123 * Defines the UID/GID for the Bluetooth service process. 124 * @hide 125 */ 126 public static final int BLUETOOTH_UID = 1002; 127 128 /** 129 * Defines the GID for the group that allows write access to the internal media storage. 130 * @hide 131 */ 132 public static final int MEDIA_RW_GID = 1023; 133 134 /** 135 * Access to installed package details 136 * @hide 137 */ 138 public static final int PACKAGE_INFO_GID = 1032; 139 140 /** 141 * Defines the UID/GID for the shared RELRO file updater process. 142 * @hide 143 */ 144 public static final int SHARED_RELRO_UID = 1037; 145 146 /** 147 * Defines the start of a range of UIDs (and GIDs), going from this 148 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 149 * to applications. 150 */ 151 public static final int FIRST_APPLICATION_UID = 10000; 152 153 /** 154 * Last of application-specific UIDs starting at 155 * {@link #FIRST_APPLICATION_UID}. 156 */ 157 public static final int LAST_APPLICATION_UID = 19999; 158 159 /** 160 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 161 * @hide 162 */ 163 public static final int FIRST_ISOLATED_UID = 99000; 164 165 /** 166 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 167 * @hide 168 */ 169 public static final int LAST_ISOLATED_UID = 99999; 170 171 /** 172 * Defines the gid shared by all applications running under the same profile. 173 * @hide 174 */ 175 public static final int SHARED_USER_GID = 9997; 176 177 /** 178 * First gid for applications to share resources. Used when forward-locking 179 * is enabled but all UserHandles need to be able to read the resources. 180 * @hide 181 */ 182 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 183 184 /** 185 * Last gid for applications to share resources. Used when forward-locking 186 * is enabled but all UserHandles need to be able to read the resources. 187 * @hide 188 */ 189 public static final int LAST_SHARED_APPLICATION_GID = 59999; 190 191 /** 192 * Standard priority of application threads. 193 * Use with {@link #setThreadPriority(int)} and 194 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 195 * {@link java.lang.Thread} class. 196 */ 197 public static final int THREAD_PRIORITY_DEFAULT = 0; 198 199 /* 200 * *************************************** 201 * ** Keep in sync with utils/threads.h ** 202 * *************************************** 203 */ 204 205 /** 206 * Lowest available thread priority. Only for those who really, really 207 * don't want to run if anything else is happening. 208 * Use with {@link #setThreadPriority(int)} and 209 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 210 * {@link java.lang.Thread} class. 211 */ 212 public static final int THREAD_PRIORITY_LOWEST = 19; 213 214 /** 215 * Standard priority background threads. This gives your thread a slightly 216 * lower than normal priority, so that it will have less chance of impacting 217 * the responsiveness of the user interface. 218 * Use with {@link #setThreadPriority(int)} and 219 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 220 * {@link java.lang.Thread} class. 221 */ 222 public static final int THREAD_PRIORITY_BACKGROUND = 10; 223 224 /** 225 * Standard priority of threads that are currently running a user interface 226 * that the user is interacting with. Applications can not normally 227 * change to this priority; the system will automatically adjust your 228 * application threads as the user moves through the UI. 229 * Use with {@link #setThreadPriority(int)} and 230 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 231 * {@link java.lang.Thread} class. 232 */ 233 public static final int THREAD_PRIORITY_FOREGROUND = -2; 234 235 /** 236 * Standard priority of system display threads, involved in updating 237 * the user interface. Applications can not 238 * normally change to this priority. 239 * Use with {@link #setThreadPriority(int)} and 240 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 241 * {@link java.lang.Thread} class. 242 */ 243 public static final int THREAD_PRIORITY_DISPLAY = -4; 244 245 /** 246 * Standard priority of the most important display threads, for compositing 247 * the screen and retrieving input events. Applications can not normally 248 * change to this priority. 249 * Use with {@link #setThreadPriority(int)} and 250 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 251 * {@link java.lang.Thread} class. 252 */ 253 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 254 255 /** 256 * Standard priority of audio threads. Applications can not normally 257 * change to this priority. 258 * Use with {@link #setThreadPriority(int)} and 259 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 260 * {@link java.lang.Thread} class. 261 */ 262 public static final int THREAD_PRIORITY_AUDIO = -16; 263 264 /** 265 * Standard priority of the most important audio threads. 266 * Applications can not normally change to this priority. 267 * Use with {@link #setThreadPriority(int)} and 268 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 269 * {@link java.lang.Thread} class. 270 */ 271 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 272 273 /** 274 * Minimum increment to make a priority more favorable. 275 */ 276 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 277 278 /** 279 * Minimum increment to make a priority less favorable. 280 */ 281 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 282 283 /** 284 * Default scheduling policy 285 * @hide 286 */ 287 public static final int SCHED_OTHER = 0; 288 289 /** 290 * First-In First-Out scheduling policy 291 * @hide 292 */ 293 public static final int SCHED_FIFO = 1; 294 295 /** 296 * Round-Robin scheduling policy 297 * @hide 298 */ 299 public static final int SCHED_RR = 2; 300 301 /** 302 * Batch scheduling policy 303 * @hide 304 */ 305 public static final int SCHED_BATCH = 3; 306 307 /** 308 * Idle scheduling policy 309 * @hide 310 */ 311 public static final int SCHED_IDLE = 5; 312 313 // Keep in sync with SP_* constants of enum type SchedPolicy 314 // declared in system/core/include/cutils/sched_policy.h, 315 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 316 317 /** 318 * Default thread group - 319 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 320 * When used with setProcessGroup(), the group of each thread in the process 321 * is conditionally changed based on that thread's current priority, as follows: 322 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 323 * are moved to foreground thread group. All other threads are left unchanged. 324 * @hide 325 */ 326 public static final int THREAD_GROUP_DEFAULT = -1; 327 328 /** 329 * Background thread group - All threads in 330 * this group are scheduled with a reduced share of the CPU. 331 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 332 * FIXME rename to THREAD_GROUP_BACKGROUND. 333 * @hide 334 */ 335 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 336 337 /** 338 * Foreground thread group - All threads in 339 * this group are scheduled with a normal share of the CPU. 340 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 341 * Not used at this level. 342 * @hide 343 **/ 344 private static final int THREAD_GROUP_FOREGROUND = 1; 345 346 /** 347 * System thread group. 348 * @hide 349 **/ 350 public static final int THREAD_GROUP_SYSTEM = 2; 351 352 /** 353 * Application audio thread group. 354 * @hide 355 **/ 356 public static final int THREAD_GROUP_AUDIO_APP = 3; 357 358 /** 359 * System audio thread group. 360 * @hide 361 **/ 362 public static final int THREAD_GROUP_AUDIO_SYS = 4; 363 364 public static final int SIGNAL_QUIT = 3; 365 public static final int SIGNAL_KILL = 9; 366 public static final int SIGNAL_USR1 = 10; 367 368 /** 369 * State for communicating with the zygote process. 370 * 371 * @hide for internal use only. 372 */ 373 public static class ZygoteState { 374 final LocalSocket socket; 375 final DataInputStream inputStream; 376 final BufferedWriter writer; 377 final List<String> abiList; 378 379 boolean mClosed; 380 381 private ZygoteState(LocalSocket socket, DataInputStream inputStream, 382 BufferedWriter writer, List<String> abiList) { 383 this.socket = socket; 384 this.inputStream = inputStream; 385 this.writer = writer; 386 this.abiList = abiList; 387 } 388 389 public static ZygoteState connect(String socketAddress) throws IOException { 390 DataInputStream zygoteInputStream = null; 391 BufferedWriter zygoteWriter = null; 392 final LocalSocket zygoteSocket = new LocalSocket(); 393 394 try { 395 zygoteSocket.connect(new LocalSocketAddress(socketAddress, 396 LocalSocketAddress.Namespace.RESERVED)); 397 398 zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); 399 400 zygoteWriter = new BufferedWriter(new OutputStreamWriter( 401 zygoteSocket.getOutputStream()), 256); 402 } catch (IOException ex) { 403 try { 404 zygoteSocket.close(); 405 } catch (IOException ignore) { 406 } 407 408 throw ex; 409 } 410 411 String abiListString = getAbiList(zygoteWriter, zygoteInputStream); 412 Log.i("Zygote", "Process: zygote socket opened, supported ABIS: " + abiListString); 413 414 return new ZygoteState(zygoteSocket, zygoteInputStream, zygoteWriter, 415 Arrays.asList(abiListString.split(","))); 416 } 417 418 boolean matches(String abi) { 419 return abiList.contains(abi); 420 } 421 422 public void close() { 423 try { 424 socket.close(); 425 } catch (IOException ex) { 426 Log.e(LOG_TAG,"I/O exception on routine close", ex); 427 } 428 429 mClosed = true; 430 } 431 432 boolean isClosed() { 433 return mClosed; 434 } 435 } 436 437 /** 438 * The state of the connection to the primary zygote. 439 */ 440 static ZygoteState primaryZygoteState; 441 442 /** 443 * The state of the connection to the secondary zygote. 444 */ 445 static ZygoteState secondaryZygoteState; 446 447 /** 448 * Start a new process. 449 * 450 * <p>If processes are enabled, a new process is created and the 451 * static main() function of a <var>processClass</var> is executed there. 452 * The process will continue running after this function returns. 453 * 454 * <p>If processes are not enabled, a new thread in the caller's 455 * process is created and main() of <var>processClass</var> called there. 456 * 457 * <p>The niceName parameter, if not an empty string, is a custom name to 458 * give to the process instead of using processClass. This allows you to 459 * make easily identifyable processes even if you are using the same base 460 * <var>processClass</var> to start them. 461 * 462 * @param processClass The class to use as the process's main entry 463 * point. 464 * @param niceName A more readable name to use for the process. 465 * @param uid The user-id under which the process will run. 466 * @param gid The group-id under which the process will run. 467 * @param gids Additional group-ids associated with the process. 468 * @param debugFlags Additional flags. 469 * @param targetSdkVersion The target SDK version for the app. 470 * @param seInfo null-ok SELinux information for the new process. 471 * @param abi non-null the ABI this app should be started with. 472 * @param instructionSet null-ok the instruction set to use. 473 * @param appDataDir null-ok the data directory of the app. 474 * @param zygoteArgs Additional arguments to supply to the zygote process. 475 * 476 * @return An object that describes the result of the attempt to start the process. 477 * @throws RuntimeException on fatal start failure 478 * 479 * {@hide} 480 */ 481 public static final ProcessStartResult start(final String processClass, 482 final String niceName, 483 int uid, int gid, int[] gids, 484 int debugFlags, int mountExternal, 485 int targetSdkVersion, 486 String seInfo, 487 String abi, 488 String instructionSet, 489 String appDataDir, 490 String[] zygoteArgs) { 491 try { 492 return startViaZygote(processClass, niceName, uid, gid, gids, 493 debugFlags, mountExternal, targetSdkVersion, seInfo, 494 abi, instructionSet, appDataDir, zygoteArgs); 495 } catch (ZygoteStartFailedEx ex) { 496 Log.e(LOG_TAG, 497 "Starting VM process through Zygote failed"); 498 throw new RuntimeException( 499 "Starting VM process through Zygote failed", ex); 500 } 501 } 502 503 /** retry interval for opening a zygote socket */ 504 static final int ZYGOTE_RETRY_MILLIS = 500; 505 506 /** 507 * Queries the zygote for the list of ABIS it supports. 508 * 509 * @throws ZygoteStartFailedEx if the query failed. 510 */ 511 private static String getAbiList(BufferedWriter writer, DataInputStream inputStream) 512 throws IOException { 513 // Each query starts with the argument count (1 in this case) 514 writer.write("1"); 515 // ... followed by a new-line. 516 writer.newLine(); 517 // ... followed by our only argument. 518 writer.write("--query-abi-list"); 519 writer.newLine(); 520 writer.flush(); 521 522 // The response is a length prefixed stream of ASCII bytes. 523 int numBytes = inputStream.readInt(); 524 byte[] bytes = new byte[numBytes]; 525 inputStream.readFully(bytes); 526 527 return new String(bytes, StandardCharsets.US_ASCII); 528 } 529 530 /** 531 * Sends an argument list to the zygote process, which starts a new child 532 * and returns the child's pid. Please note: the present implementation 533 * replaces newlines in the argument list with spaces. 534 * 535 * @throws ZygoteStartFailedEx if process start failed for any reason 536 */ 537 private static ProcessStartResult zygoteSendArgsAndGetResult( 538 ZygoteState zygoteState, ArrayList<String> args) 539 throws ZygoteStartFailedEx { 540 try { 541 /** 542 * See com.android.internal.os.ZygoteInit.readArgumentList() 543 * Presently the wire format to the zygote process is: 544 * a) a count of arguments (argc, in essence) 545 * b) a number of newline-separated argument strings equal to count 546 * 547 * After the zygote process reads these it will write the pid of 548 * the child or -1 on failure, followed by boolean to 549 * indicate whether a wrapper process was used. 550 */ 551 final BufferedWriter writer = zygoteState.writer; 552 final DataInputStream inputStream = zygoteState.inputStream; 553 554 writer.write(Integer.toString(args.size())); 555 writer.newLine(); 556 557 int sz = args.size(); 558 for (int i = 0; i < sz; i++) { 559 String arg = args.get(i); 560 if (arg.indexOf('\n') >= 0) { 561 throw new ZygoteStartFailedEx( 562 "embedded newlines not allowed"); 563 } 564 writer.write(arg); 565 writer.newLine(); 566 } 567 568 writer.flush(); 569 570 // Should there be a timeout on this? 571 ProcessStartResult result = new ProcessStartResult(); 572 result.pid = inputStream.readInt(); 573 if (result.pid < 0) { 574 throw new ZygoteStartFailedEx("fork() failed"); 575 } 576 result.usingWrapper = inputStream.readBoolean(); 577 return result; 578 } catch (IOException ex) { 579 zygoteState.close(); 580 throw new ZygoteStartFailedEx(ex); 581 } 582 } 583 584 /** 585 * Starts a new process via the zygote mechanism. 586 * 587 * @param processClass Class name whose static main() to run 588 * @param niceName 'nice' process name to appear in ps 589 * @param uid a POSIX uid that the new process should setuid() to 590 * @param gid a POSIX gid that the new process shuold setgid() to 591 * @param gids null-ok; a list of supplementary group IDs that the 592 * new process should setgroup() to. 593 * @param debugFlags Additional flags. 594 * @param targetSdkVersion The target SDK version for the app. 595 * @param seInfo null-ok SELinux information for the new process. 596 * @param abi the ABI the process should use. 597 * @param instructionSet null-ok the instruction set to use. 598 * @param appDataDir null-ok the data directory of the app. 599 * @param extraArgs Additional arguments to supply to the zygote process. 600 * @return An object that describes the result of the attempt to start the process. 601 * @throws ZygoteStartFailedEx if process start failed for any reason 602 */ 603 private static ProcessStartResult startViaZygote(final String processClass, 604 final String niceName, 605 final int uid, final int gid, 606 final int[] gids, 607 int debugFlags, int mountExternal, 608 int targetSdkVersion, 609 String seInfo, 610 String abi, 611 String instructionSet, 612 String appDataDir, 613 String[] extraArgs) 614 throws ZygoteStartFailedEx { 615 synchronized(Process.class) { 616 ArrayList<String> argsForZygote = new ArrayList<String>(); 617 618 // --runtime-args, --setuid=, --setgid=, 619 // and --setgroups= must go first 620 argsForZygote.add("--runtime-args"); 621 argsForZygote.add("--setuid=" + uid); 622 argsForZygote.add("--setgid=" + gid); 623 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 624 argsForZygote.add("--enable-jni-logging"); 625 } 626 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 627 argsForZygote.add("--enable-safemode"); 628 } 629 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 630 argsForZygote.add("--enable-debugger"); 631 } 632 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 633 argsForZygote.add("--enable-checkjni"); 634 } 635 if ((debugFlags & Zygote.DEBUG_ENABLE_JIT) != 0) { 636 argsForZygote.add("--enable-jit"); 637 } 638 if ((debugFlags & Zygote.DEBUG_GENERATE_CFI) != 0) { 639 argsForZygote.add("--generate-cfi"); 640 } 641 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 642 argsForZygote.add("--enable-assert"); 643 } 644 if (mountExternal == Zygote.MOUNT_EXTERNAL_DEFAULT) { 645 argsForZygote.add("--mount-external-default"); 646 } 647 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 648 649 //TODO optionally enable debuger 650 //argsForZygote.add("--enable-debugger"); 651 652 // --setgroups is a comma-separated list 653 if (gids != null && gids.length > 0) { 654 StringBuilder sb = new StringBuilder(); 655 sb.append("--setgroups="); 656 657 int sz = gids.length; 658 for (int i = 0; i < sz; i++) { 659 if (i != 0) { 660 sb.append(','); 661 } 662 sb.append(gids[i]); 663 } 664 665 argsForZygote.add(sb.toString()); 666 } 667 668 if (niceName != null) { 669 argsForZygote.add("--nice-name=" + niceName); 670 } 671 672 if (seInfo != null) { 673 argsForZygote.add("--seinfo=" + seInfo); 674 } 675 676 if (instructionSet != null) { 677 argsForZygote.add("--instruction-set=" + instructionSet); 678 } 679 680 if (appDataDir != null) { 681 argsForZygote.add("--app-data-dir=" + appDataDir); 682 } 683 684 argsForZygote.add(processClass); 685 686 if (extraArgs != null) { 687 for (String arg : extraArgs) { 688 argsForZygote.add(arg); 689 } 690 } 691 692 return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); 693 } 694 } 695 696 /** 697 * Tries to establish a connection to the zygote that handles a given {@code abi}. Might block and retry if the 698 * zygote is unresponsive. This method is a no-op if a connection is already open. 699 * 700 * @hide 701 */ 702 public static void establishZygoteConnectionForAbi(String abi) { 703 try { 704 openZygoteSocketIfNeeded(abi); 705 } catch (ZygoteStartFailedEx ex) { 706 throw new RuntimeException("Unable to connect to zygote for abi: " + abi, ex); 707 } 708 } 709 710 /** 711 * Tries to open socket to Zygote process if not already open. If 712 * already open, does nothing. May block and retry. 713 */ 714 private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx { 715 if (primaryZygoteState == null || primaryZygoteState.isClosed()) { 716 try { 717 primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET); 718 } catch (IOException ioe) { 719 throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe); 720 } 721 } 722 723 if (primaryZygoteState.matches(abi)) { 724 return primaryZygoteState; 725 } 726 727 // The primary zygote didn't match. Try the secondary. 728 if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { 729 try { 730 secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET); 731 } catch (IOException ioe) { 732 throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe); 733 } 734 } 735 736 if (secondaryZygoteState.matches(abi)) { 737 return secondaryZygoteState; 738 } 739 740 throw new ZygoteStartFailedEx("Unsupported zygote ABI: " + abi); 741 } 742 743 /** 744 * Returns elapsed milliseconds of the time this process has run. 745 * @return Returns the number of milliseconds this process has return. 746 */ 747 public static final native long getElapsedCpuTime(); 748 749 /** 750 * Returns true if the current process is a 64-bit runtime. 751 */ 752 public static final boolean is64Bit() { 753 return VMRuntime.getRuntime().is64Bit(); 754 } 755 756 /** 757 * Returns the identifier of this process, which can be used with 758 * {@link #killProcess} and {@link #sendSignal}. 759 */ 760 public static final int myPid() { 761 return Os.getpid(); 762 } 763 764 /** 765 * Returns the identifier of this process' parent. 766 * @hide 767 */ 768 public static final int myPpid() { 769 return Os.getppid(); 770 } 771 772 /** 773 * Returns the identifier of the calling thread, which be used with 774 * {@link #setThreadPriority(int, int)}. 775 */ 776 public static final int myTid() { 777 return Os.gettid(); 778 } 779 780 /** 781 * Returns the identifier of this process's uid. This is the kernel uid 782 * that the process is running under, which is the identity of its 783 * app-specific sandbox. It is different from {@link #myUserHandle} in that 784 * a uid identifies a specific app sandbox in a specific user. 785 */ 786 public static final int myUid() { 787 return Os.getuid(); 788 } 789 790 /** 791 * Returns this process's user handle. This is the 792 * user the process is running under. It is distinct from 793 * {@link #myUid()} in that a particular user will have multiple 794 * distinct apps running under it each with their own uid. 795 */ 796 public static final UserHandle myUserHandle() { 797 return new UserHandle(UserHandle.getUserId(myUid())); 798 } 799 800 /** 801 * Returns whether the current process is in an isolated sandbox. 802 * @hide 803 */ 804 public static final boolean isIsolated() { 805 int uid = UserHandle.getAppId(myUid()); 806 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 807 } 808 809 /** 810 * Returns the UID assigned to a particular user name, or -1 if there is 811 * none. If the given string consists of only numbers, it is converted 812 * directly to a uid. 813 */ 814 public static final native int getUidForName(String name); 815 816 /** 817 * Returns the GID assigned to a particular user name, or -1 if there is 818 * none. If the given string consists of only numbers, it is converted 819 * directly to a gid. 820 */ 821 public static final native int getGidForName(String name); 822 823 /** 824 * Returns a uid for a currently running process. 825 * @param pid the process id 826 * @return the uid of the process, or -1 if the process is not running. 827 * @hide pending API council review 828 */ 829 public static final int getUidForPid(int pid) { 830 String[] procStatusLabels = { "Uid:" }; 831 long[] procStatusValues = new long[1]; 832 procStatusValues[0] = -1; 833 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 834 return (int) procStatusValues[0]; 835 } 836 837 /** 838 * Returns the parent process id for a currently running process. 839 * @param pid the process id 840 * @return the parent process id of the process, or -1 if the process is not running. 841 * @hide 842 */ 843 public static final int getParentPid(int pid) { 844 String[] procStatusLabels = { "PPid:" }; 845 long[] procStatusValues = new long[1]; 846 procStatusValues[0] = -1; 847 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 848 return (int) procStatusValues[0]; 849 } 850 851 /** 852 * Returns the thread group leader id for a currently running thread. 853 * @param tid the thread id 854 * @return the thread group leader id of the thread, or -1 if the thread is not running. 855 * This is same as what getpid(2) would return if called by tid. 856 * @hide 857 */ 858 public static final int getThreadGroupLeader(int tid) { 859 String[] procStatusLabels = { "Tgid:" }; 860 long[] procStatusValues = new long[1]; 861 procStatusValues[0] = -1; 862 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 863 return (int) procStatusValues[0]; 864 } 865 866 /** 867 * Set the priority of a thread, based on Linux priorities. 868 * 869 * @param tid The identifier of the thread/process to change. 870 * @param priority A Linux priority level, from -20 for highest scheduling 871 * priority to 19 for lowest scheduling priority. 872 * 873 * @throws IllegalArgumentException Throws IllegalArgumentException if 874 * <var>tid</var> does not exist. 875 * @throws SecurityException Throws SecurityException if your process does 876 * not have permission to modify the given thread, or to use the given 877 * priority. 878 */ 879 public static final native void setThreadPriority(int tid, int priority) 880 throws IllegalArgumentException, SecurityException; 881 882 /** 883 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 884 * throw an exception if passed a background-level thread priority. This is only 885 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 886 * 887 * @hide 888 */ 889 public static final native void setCanSelfBackground(boolean backgroundOk); 890 891 /** 892 * Sets the scheduling group for a thread. 893 * @hide 894 * @param tid The identifier of the thread to change. 895 * @param group The target group for this thread from THREAD_GROUP_*. 896 * 897 * @throws IllegalArgumentException Throws IllegalArgumentException if 898 * <var>tid</var> does not exist. 899 * @throws SecurityException Throws SecurityException if your process does 900 * not have permission to modify the given thread, or to use the given 901 * priority. 902 * If the thread is a thread group leader, that is it's gettid() == getpid(), 903 * then the other threads in the same thread group are _not_ affected. 904 */ 905 public static final native void setThreadGroup(int tid, int group) 906 throws IllegalArgumentException, SecurityException; 907 908 /** 909 * Sets the scheduling group for a process and all child threads 910 * @hide 911 * @param pid The identifier of the process to change. 912 * @param group The target group for this process from THREAD_GROUP_*. 913 * 914 * @throws IllegalArgumentException Throws IllegalArgumentException if 915 * <var>tid</var> does not exist. 916 * @throws SecurityException Throws SecurityException if your process does 917 * not have permission to modify the given thread, or to use the given 918 * priority. 919 * 920 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 921 * threads to the foreground scheduling group, but to leave background 922 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 923 * threads, regardless of priority, to the background scheduling group. 924 * group == THREAD_GROUP_FOREGROUND is not allowed. 925 */ 926 public static final native void setProcessGroup(int pid, int group) 927 throws IllegalArgumentException, SecurityException; 928 929 /** 930 * Return the scheduling group of requested process. 931 * 932 * @hide 933 */ 934 public static final native int getProcessGroup(int pid) 935 throws IllegalArgumentException, SecurityException; 936 937 /** 938 * Set the priority of the calling thread, based on Linux priorities. See 939 * {@link #setThreadPriority(int, int)} for more information. 940 * 941 * @param priority A Linux priority level, from -20 for highest scheduling 942 * priority to 19 for lowest scheduling priority. 943 * 944 * @throws IllegalArgumentException Throws IllegalArgumentException if 945 * <var>tid</var> does not exist. 946 * @throws SecurityException Throws SecurityException if your process does 947 * not have permission to modify the given thread, or to use the given 948 * priority. 949 * 950 * @see #setThreadPriority(int, int) 951 */ 952 public static final native void setThreadPriority(int priority) 953 throws IllegalArgumentException, SecurityException; 954 955 /** 956 * Return the current priority of a thread, based on Linux priorities. 957 * 958 * @param tid The identifier of the thread/process to change. 959 * 960 * @return Returns the current priority, as a Linux priority level, 961 * from -20 for highest scheduling priority to 19 for lowest scheduling 962 * priority. 963 * 964 * @throws IllegalArgumentException Throws IllegalArgumentException if 965 * <var>tid</var> does not exist. 966 */ 967 public static final native int getThreadPriority(int tid) 968 throws IllegalArgumentException; 969 970 /** 971 * Set the scheduling policy and priority of a thread, based on Linux. 972 * 973 * @param tid The identifier of the thread/process to change. 974 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 975 * @param priority A Linux priority level in a range appropriate for the given policy. 976 * 977 * @throws IllegalArgumentException Throws IllegalArgumentException if 978 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 979 * @throws SecurityException Throws SecurityException if your process does 980 * not have permission to modify the given thread, or to use the given 981 * scheduling policy or priority. 982 * 983 * {@hide} 984 */ 985 public static final native void setThreadScheduler(int tid, int policy, int priority) 986 throws IllegalArgumentException; 987 988 /** 989 * Determine whether the current environment supports multiple processes. 990 * 991 * @return Returns true if the system can run in multiple processes, else 992 * false if everything is running in a single process. 993 * 994 * @deprecated This method always returns true. Do not use. 995 */ 996 @Deprecated 997 public static final boolean supportsProcesses() { 998 return true; 999 } 1000 1001 /** 1002 * Adjust the swappiness level for a process. 1003 * 1004 * @param pid The process identifier to set. 1005 * @param is_increased Whether swappiness should be increased or default. 1006 * 1007 * @return Returns true if the underlying system supports this 1008 * feature, else false. 1009 * 1010 * {@hide} 1011 */ 1012 public static final native boolean setSwappiness(int pid, boolean is_increased); 1013 1014 /** 1015 * Change this process's argv[0] parameter. This can be useful to show 1016 * more descriptive information in things like the 'ps' command. 1017 * 1018 * @param text The new name of this process. 1019 * 1020 * {@hide} 1021 */ 1022 public static final native void setArgV0(String text); 1023 1024 /** 1025 * Kill the process with the given PID. 1026 * Note that, though this API allows us to request to 1027 * kill any process based on its PID, the kernel will 1028 * still impose standard restrictions on which PIDs you 1029 * are actually able to kill. Typically this means only 1030 * the process running the caller's packages/application 1031 * and any additional processes created by that app; packages 1032 * sharing a common UID will also be able to kill each 1033 * other's processes. 1034 */ 1035 public static final void killProcess(int pid) { 1036 sendSignal(pid, SIGNAL_KILL); 1037 } 1038 1039 /** @hide */ 1040 public static final native int setUid(int uid); 1041 1042 /** @hide */ 1043 public static final native int setGid(int uid); 1044 1045 /** 1046 * Send a signal to the given process. 1047 * 1048 * @param pid The pid of the target process. 1049 * @param signal The signal to send. 1050 */ 1051 public static final native void sendSignal(int pid, int signal); 1052 1053 /** 1054 * @hide 1055 * Private impl for avoiding a log message... DO NOT USE without doing 1056 * your own log, or the Android Illuminati will find you some night and 1057 * beat you up. 1058 */ 1059 public static final void killProcessQuiet(int pid) { 1060 sendSignalQuiet(pid, SIGNAL_KILL); 1061 } 1062 1063 /** 1064 * @hide 1065 * Private impl for avoiding a log message... DO NOT USE without doing 1066 * your own log, or the Android Illuminati will find you some night and 1067 * beat you up. 1068 */ 1069 public static final native void sendSignalQuiet(int pid, int signal); 1070 1071 /** @hide */ 1072 public static final native long getFreeMemory(); 1073 1074 /** @hide */ 1075 public static final native long getTotalMemory(); 1076 1077 /** @hide */ 1078 public static final native void readProcLines(String path, 1079 String[] reqFields, long[] outSizes); 1080 1081 /** @hide */ 1082 public static final native int[] getPids(String path, int[] lastArray); 1083 1084 /** @hide */ 1085 public static final int PROC_TERM_MASK = 0xff; 1086 /** @hide */ 1087 public static final int PROC_ZERO_TERM = 0; 1088 /** @hide */ 1089 public static final int PROC_SPACE_TERM = (int)' '; 1090 /** @hide */ 1091 public static final int PROC_TAB_TERM = (int)'\t'; 1092 /** @hide */ 1093 public static final int PROC_COMBINE = 0x100; 1094 /** @hide */ 1095 public static final int PROC_PARENS = 0x200; 1096 /** @hide */ 1097 public static final int PROC_QUOTES = 0x400; 1098 /** @hide */ 1099 public static final int PROC_OUT_STRING = 0x1000; 1100 /** @hide */ 1101 public static final int PROC_OUT_LONG = 0x2000; 1102 /** @hide */ 1103 public static final int PROC_OUT_FLOAT = 0x4000; 1104 1105 /** @hide */ 1106 public static final native boolean readProcFile(String file, int[] format, 1107 String[] outStrings, long[] outLongs, float[] outFloats); 1108 1109 /** @hide */ 1110 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 1111 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 1112 1113 /** @hide */ 1114 public static final native int[] getPidsForCommands(String[] cmds); 1115 1116 /** 1117 * Gets the total Pss value for a given process, in bytes. 1118 * 1119 * @param pid the process to the Pss for 1120 * @return the total Pss value for the given process in bytes, 1121 * or -1 if the value cannot be determined 1122 * @hide 1123 */ 1124 public static final native long getPss(int pid); 1125 1126 /** 1127 * Specifies the outcome of having started a process. 1128 * @hide 1129 */ 1130 public static final class ProcessStartResult { 1131 /** 1132 * The PID of the newly started process. 1133 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1134 */ 1135 public int pid; 1136 1137 /** 1138 * True if the process was started with a wrapper attached. 1139 */ 1140 public boolean usingWrapper; 1141 } 1142 1143 /** 1144 * Kill all processes in a process group started for the given 1145 * pid. 1146 * @hide 1147 */ 1148 public static final native int killProcessGroup(int uid, int pid); 1149 1150 /** 1151 * Remove all process groups. Expected to be called when ActivityManager 1152 * is restarted. 1153 * @hide 1154 */ 1155 public static final native void removeAllProcessGroups(); 1156} 1157