Process.java revision 448be0a62209c977593d81617853a8a428d013df
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 UID/GID for the audioserver process. 148 * @hide 149 */ 150 public static final int AUDIOSERVER_UID = 1041; 151 152 /** 153 * Defines the UID/GID for the cameraserver process 154 * @hide 155 */ 156 public static final int CAMERASERVER_UID = 1047; 157 158 /** 159 * Defines the start of a range of UIDs (and GIDs), going from this 160 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 161 * to applications. 162 */ 163 public static final int FIRST_APPLICATION_UID = 10000; 164 165 /** 166 * Last of application-specific UIDs starting at 167 * {@link #FIRST_APPLICATION_UID}. 168 */ 169 public static final int LAST_APPLICATION_UID = 19999; 170 171 /** 172 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 173 * @hide 174 */ 175 public static final int FIRST_ISOLATED_UID = 99000; 176 177 /** 178 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 179 * @hide 180 */ 181 public static final int LAST_ISOLATED_UID = 99999; 182 183 /** 184 * Defines the gid shared by all applications running under the same profile. 185 * @hide 186 */ 187 public static final int SHARED_USER_GID = 9997; 188 189 /** 190 * First gid for applications to share resources. Used when forward-locking 191 * is enabled but all UserHandles need to be able to read the resources. 192 * @hide 193 */ 194 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 195 196 /** 197 * Last gid for applications to share resources. Used when forward-locking 198 * is enabled but all UserHandles need to be able to read the resources. 199 * @hide 200 */ 201 public static final int LAST_SHARED_APPLICATION_GID = 59999; 202 203 /** 204 * Standard priority of application threads. 205 * Use with {@link #setThreadPriority(int)} and 206 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 207 * {@link java.lang.Thread} class. 208 */ 209 public static final int THREAD_PRIORITY_DEFAULT = 0; 210 211 /* 212 * *************************************** 213 * ** Keep in sync with utils/threads.h ** 214 * *************************************** 215 */ 216 217 /** 218 * Lowest available thread priority. Only for those who really, really 219 * don't want to run if anything else is happening. 220 * Use with {@link #setThreadPriority(int)} and 221 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 222 * {@link java.lang.Thread} class. 223 */ 224 public static final int THREAD_PRIORITY_LOWEST = 19; 225 226 /** 227 * Standard priority background threads. This gives your thread a slightly 228 * lower than normal priority, so that it will have less chance of impacting 229 * the responsiveness of the user interface. 230 * Use with {@link #setThreadPriority(int)} and 231 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 232 * {@link java.lang.Thread} class. 233 */ 234 public static final int THREAD_PRIORITY_BACKGROUND = 10; 235 236 /** 237 * Standard priority of threads that are currently running a user interface 238 * that the user is interacting with. Applications can not normally 239 * change to this priority; the system will automatically adjust your 240 * application threads as the user moves through the UI. 241 * Use with {@link #setThreadPriority(int)} and 242 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 243 * {@link java.lang.Thread} class. 244 */ 245 public static final int THREAD_PRIORITY_FOREGROUND = -2; 246 247 /** 248 * Standard priority of system display threads, involved in updating 249 * the user interface. Applications can not 250 * normally change to this priority. 251 * Use with {@link #setThreadPriority(int)} and 252 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 253 * {@link java.lang.Thread} class. 254 */ 255 public static final int THREAD_PRIORITY_DISPLAY = -4; 256 257 /** 258 * Standard priority of the most important display threads, for compositing 259 * the screen and retrieving input events. Applications can not normally 260 * change to this priority. 261 * Use with {@link #setThreadPriority(int)} and 262 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 263 * {@link java.lang.Thread} class. 264 */ 265 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 266 267 /** 268 * Standard priority of audio threads. Applications can not normally 269 * change to this priority. 270 * Use with {@link #setThreadPriority(int)} and 271 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 272 * {@link java.lang.Thread} class. 273 */ 274 public static final int THREAD_PRIORITY_AUDIO = -16; 275 276 /** 277 * Standard priority of the most important audio threads. 278 * Applications can not normally change to this priority. 279 * Use with {@link #setThreadPriority(int)} and 280 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 281 * {@link java.lang.Thread} class. 282 */ 283 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 284 285 /** 286 * Minimum increment to make a priority more favorable. 287 */ 288 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 289 290 /** 291 * Minimum increment to make a priority less favorable. 292 */ 293 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 294 295 /** 296 * Default scheduling policy 297 * @hide 298 */ 299 public static final int SCHED_OTHER = 0; 300 301 /** 302 * First-In First-Out scheduling policy 303 * @hide 304 */ 305 public static final int SCHED_FIFO = 1; 306 307 /** 308 * Round-Robin scheduling policy 309 * @hide 310 */ 311 public static final int SCHED_RR = 2; 312 313 /** 314 * Batch scheduling policy 315 * @hide 316 */ 317 public static final int SCHED_BATCH = 3; 318 319 /** 320 * Idle scheduling policy 321 * @hide 322 */ 323 public static final int SCHED_IDLE = 5; 324 325 // Keep in sync with SP_* constants of enum type SchedPolicy 326 // declared in system/core/include/cutils/sched_policy.h, 327 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 328 329 /** 330 * Default thread group - 331 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 332 * When used with setProcessGroup(), the group of each thread in the process 333 * is conditionally changed based on that thread's current priority, as follows: 334 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 335 * are moved to foreground thread group. All other threads are left unchanged. 336 * @hide 337 */ 338 public static final int THREAD_GROUP_DEFAULT = -1; 339 340 /** 341 * Background thread group - All threads in 342 * this group are scheduled with a reduced share of the CPU. 343 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 344 * FIXME rename to THREAD_GROUP_BACKGROUND. 345 * @hide 346 */ 347 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 348 349 /** 350 * Foreground thread group - All threads in 351 * this group are scheduled with a normal share of the CPU. 352 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 353 * Not used at this level. 354 * @hide 355 **/ 356 private static final int THREAD_GROUP_FOREGROUND = 1; 357 358 /** 359 * System thread group. 360 * @hide 361 **/ 362 public static final int THREAD_GROUP_SYSTEM = 2; 363 364 /** 365 * Application audio thread group. 366 * @hide 367 **/ 368 public static final int THREAD_GROUP_AUDIO_APP = 3; 369 370 /** 371 * System audio thread group. 372 * @hide 373 **/ 374 public static final int THREAD_GROUP_AUDIO_SYS = 4; 375 376 /** 377 * Thread group for top foreground app. 378 * @hide 379 **/ 380 public static final int THREAD_GROUP_TOP_APP = 5; 381 382 public static final int SIGNAL_QUIT = 3; 383 public static final int SIGNAL_KILL = 9; 384 public static final int SIGNAL_USR1 = 10; 385 386 private static long sStartElapsedRealtime; 387 private static long sStartUptimeMillis; 388 389 /** 390 * State for communicating with the zygote process. 391 * 392 * @hide for internal use only. 393 */ 394 public static class ZygoteState { 395 final LocalSocket socket; 396 final DataInputStream inputStream; 397 final BufferedWriter writer; 398 final List<String> abiList; 399 400 boolean mClosed; 401 402 private ZygoteState(LocalSocket socket, DataInputStream inputStream, 403 BufferedWriter writer, List<String> abiList) { 404 this.socket = socket; 405 this.inputStream = inputStream; 406 this.writer = writer; 407 this.abiList = abiList; 408 } 409 410 public static ZygoteState connect(String socketAddress) throws IOException { 411 DataInputStream zygoteInputStream = null; 412 BufferedWriter zygoteWriter = null; 413 final LocalSocket zygoteSocket = new LocalSocket(); 414 415 try { 416 zygoteSocket.connect(new LocalSocketAddress(socketAddress, 417 LocalSocketAddress.Namespace.RESERVED)); 418 419 zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); 420 421 zygoteWriter = new BufferedWriter(new OutputStreamWriter( 422 zygoteSocket.getOutputStream()), 256); 423 } catch (IOException ex) { 424 try { 425 zygoteSocket.close(); 426 } catch (IOException ignore) { 427 } 428 429 throw ex; 430 } 431 432 String abiListString = getAbiList(zygoteWriter, zygoteInputStream); 433 Log.i("Zygote", "Process: zygote socket opened, supported ABIS: " + abiListString); 434 435 return new ZygoteState(zygoteSocket, zygoteInputStream, zygoteWriter, 436 Arrays.asList(abiListString.split(","))); 437 } 438 439 boolean matches(String abi) { 440 return abiList.contains(abi); 441 } 442 443 public void close() { 444 try { 445 socket.close(); 446 } catch (IOException ex) { 447 Log.e(LOG_TAG,"I/O exception on routine close", ex); 448 } 449 450 mClosed = true; 451 } 452 453 boolean isClosed() { 454 return mClosed; 455 } 456 } 457 458 /** 459 * The state of the connection to the primary zygote. 460 */ 461 static ZygoteState primaryZygoteState; 462 463 /** 464 * The state of the connection to the secondary zygote. 465 */ 466 static ZygoteState secondaryZygoteState; 467 468 /** 469 * Start a new process. 470 * 471 * <p>If processes are enabled, a new process is created and the 472 * static main() function of a <var>processClass</var> is executed there. 473 * The process will continue running after this function returns. 474 * 475 * <p>If processes are not enabled, a new thread in the caller's 476 * process is created and main() of <var>processClass</var> called there. 477 * 478 * <p>The niceName parameter, if not an empty string, is a custom name to 479 * give to the process instead of using processClass. This allows you to 480 * make easily identifyable processes even if you are using the same base 481 * <var>processClass</var> to start them. 482 * 483 * @param processClass The class to use as the process's main entry 484 * point. 485 * @param niceName A more readable name to use for the process. 486 * @param uid The user-id under which the process will run. 487 * @param gid The group-id under which the process will run. 488 * @param gids Additional group-ids associated with the process. 489 * @param debugFlags Additional flags. 490 * @param targetSdkVersion The target SDK version for the app. 491 * @param seInfo null-ok SELinux information for the new process. 492 * @param abi non-null the ABI this app should be started with. 493 * @param instructionSet null-ok the instruction set to use. 494 * @param appDataDir null-ok the data directory of the app. 495 * @param zygoteArgs Additional arguments to supply to the zygote process. 496 * 497 * @return An object that describes the result of the attempt to start the process. 498 * @throws RuntimeException on fatal start failure 499 * 500 * {@hide} 501 */ 502 public static final ProcessStartResult start(final String processClass, 503 final String niceName, 504 int uid, int gid, int[] gids, 505 int debugFlags, int mountExternal, 506 int targetSdkVersion, 507 String seInfo, 508 String abi, 509 String instructionSet, 510 String appDataDir, 511 String[] zygoteArgs) { 512 try { 513 return startViaZygote(processClass, niceName, uid, gid, gids, 514 debugFlags, mountExternal, targetSdkVersion, seInfo, 515 abi, instructionSet, appDataDir, zygoteArgs); 516 } catch (ZygoteStartFailedEx ex) { 517 Log.e(LOG_TAG, 518 "Starting VM process through Zygote failed"); 519 throw new RuntimeException( 520 "Starting VM process through Zygote failed", ex); 521 } 522 } 523 524 /** retry interval for opening a zygote socket */ 525 static final int ZYGOTE_RETRY_MILLIS = 500; 526 527 /** 528 * Queries the zygote for the list of ABIS it supports. 529 * 530 * @throws ZygoteStartFailedEx if the query failed. 531 */ 532 private static String getAbiList(BufferedWriter writer, DataInputStream inputStream) 533 throws IOException { 534 // Each query starts with the argument count (1 in this case) 535 writer.write("1"); 536 // ... followed by a new-line. 537 writer.newLine(); 538 // ... followed by our only argument. 539 writer.write("--query-abi-list"); 540 writer.newLine(); 541 writer.flush(); 542 543 // The response is a length prefixed stream of ASCII bytes. 544 int numBytes = inputStream.readInt(); 545 byte[] bytes = new byte[numBytes]; 546 inputStream.readFully(bytes); 547 548 return new String(bytes, StandardCharsets.US_ASCII); 549 } 550 551 /** 552 * Sends an argument list to the zygote process, which starts a new child 553 * and returns the child's pid. Please note: the present implementation 554 * replaces newlines in the argument list with spaces. 555 * 556 * @throws ZygoteStartFailedEx if process start failed for any reason 557 */ 558 private static ProcessStartResult zygoteSendArgsAndGetResult( 559 ZygoteState zygoteState, ArrayList<String> args) 560 throws ZygoteStartFailedEx { 561 try { 562 // Throw early if any of the arguments are malformed. This means we can 563 // avoid writing a partial response to the zygote. 564 int sz = args.size(); 565 for (int i = 0; i < sz; i++) { 566 if (args.get(i).indexOf('\n') >= 0) { 567 throw new ZygoteStartFailedEx("embedded newlines not allowed"); 568 } 569 } 570 571 /** 572 * See com.android.internal.os.ZygoteInit.readArgumentList() 573 * Presently the wire format to the zygote process is: 574 * a) a count of arguments (argc, in essence) 575 * b) a number of newline-separated argument strings equal to count 576 * 577 * After the zygote process reads these it will write the pid of 578 * the child or -1 on failure, followed by boolean to 579 * indicate whether a wrapper process was used. 580 */ 581 final BufferedWriter writer = zygoteState.writer; 582 final DataInputStream inputStream = zygoteState.inputStream; 583 584 writer.write(Integer.toString(args.size())); 585 writer.newLine(); 586 587 for (int i = 0; i < sz; i++) { 588 String arg = args.get(i); 589 writer.write(arg); 590 writer.newLine(); 591 } 592 593 writer.flush(); 594 595 // Should there be a timeout on this? 596 ProcessStartResult result = new ProcessStartResult(); 597 598 // Always read the entire result from the input stream to avoid leaving 599 // bytes in the stream for future process starts to accidentally stumble 600 // upon. 601 result.pid = inputStream.readInt(); 602 result.usingWrapper = inputStream.readBoolean(); 603 604 if (result.pid < 0) { 605 throw new ZygoteStartFailedEx("fork() failed"); 606 } 607 return result; 608 } catch (IOException ex) { 609 zygoteState.close(); 610 throw new ZygoteStartFailedEx(ex); 611 } 612 } 613 614 /** 615 * Starts a new process via the zygote mechanism. 616 * 617 * @param processClass Class name whose static main() to run 618 * @param niceName 'nice' process name to appear in ps 619 * @param uid a POSIX uid that the new process should setuid() to 620 * @param gid a POSIX gid that the new process shuold setgid() to 621 * @param gids null-ok; a list of supplementary group IDs that the 622 * new process should setgroup() to. 623 * @param debugFlags Additional flags. 624 * @param targetSdkVersion The target SDK version for the app. 625 * @param seInfo null-ok SELinux information for the new process. 626 * @param abi the ABI the process should use. 627 * @param instructionSet null-ok the instruction set to use. 628 * @param appDataDir null-ok the data directory of the app. 629 * @param extraArgs Additional arguments to supply to the zygote process. 630 * @return An object that describes the result of the attempt to start the process. 631 * @throws ZygoteStartFailedEx if process start failed for any reason 632 */ 633 private static ProcessStartResult startViaZygote(final String processClass, 634 final String niceName, 635 final int uid, final int gid, 636 final int[] gids, 637 int debugFlags, int mountExternal, 638 int targetSdkVersion, 639 String seInfo, 640 String abi, 641 String instructionSet, 642 String appDataDir, 643 String[] extraArgs) 644 throws ZygoteStartFailedEx { 645 synchronized(Process.class) { 646 ArrayList<String> argsForZygote = new ArrayList<String>(); 647 648 // --runtime-args, --setuid=, --setgid=, 649 // and --setgroups= must go first 650 argsForZygote.add("--runtime-args"); 651 argsForZygote.add("--setuid=" + uid); 652 argsForZygote.add("--setgid=" + gid); 653 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 654 argsForZygote.add("--enable-jni-logging"); 655 } 656 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 657 argsForZygote.add("--enable-safemode"); 658 } 659 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 660 argsForZygote.add("--enable-debugger"); 661 } 662 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 663 argsForZygote.add("--enable-checkjni"); 664 } 665 if ((debugFlags & Zygote.DEBUG_GENERATE_DEBUG_INFO) != 0) { 666 argsForZygote.add("--generate-debug-info"); 667 } 668 if ((debugFlags & Zygote.DEBUG_ALWAYS_JIT) != 0) { 669 argsForZygote.add("--always-jit"); 670 } 671 if ((debugFlags & Zygote.DEBUG_NATIVE_DEBUGGABLE) != 0) { 672 argsForZygote.add("--native-debuggable"); 673 } 674 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 675 argsForZygote.add("--enable-assert"); 676 } 677 if (mountExternal == Zygote.MOUNT_EXTERNAL_DEFAULT) { 678 argsForZygote.add("--mount-external-default"); 679 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_READ) { 680 argsForZygote.add("--mount-external-read"); 681 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_WRITE) { 682 argsForZygote.add("--mount-external-write"); 683 } 684 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 685 686 //TODO optionally enable debuger 687 //argsForZygote.add("--enable-debugger"); 688 689 // --setgroups is a comma-separated list 690 if (gids != null && gids.length > 0) { 691 StringBuilder sb = new StringBuilder(); 692 sb.append("--setgroups="); 693 694 int sz = gids.length; 695 for (int i = 0; i < sz; i++) { 696 if (i != 0) { 697 sb.append(','); 698 } 699 sb.append(gids[i]); 700 } 701 702 argsForZygote.add(sb.toString()); 703 } 704 705 if (niceName != null) { 706 argsForZygote.add("--nice-name=" + niceName); 707 } 708 709 if (seInfo != null) { 710 argsForZygote.add("--seinfo=" + seInfo); 711 } 712 713 if (instructionSet != null) { 714 argsForZygote.add("--instruction-set=" + instructionSet); 715 } 716 717 if (appDataDir != null) { 718 argsForZygote.add("--app-data-dir=" + appDataDir); 719 } 720 721 argsForZygote.add(processClass); 722 723 if (extraArgs != null) { 724 for (String arg : extraArgs) { 725 argsForZygote.add(arg); 726 } 727 } 728 729 return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); 730 } 731 } 732 733 /** 734 * Tries to establish a connection to the zygote that handles a given {@code abi}. Might block and retry if the 735 * zygote is unresponsive. This method is a no-op if a connection is already open. 736 * 737 * @hide 738 */ 739 public static void establishZygoteConnectionForAbi(String abi) { 740 try { 741 openZygoteSocketIfNeeded(abi); 742 } catch (ZygoteStartFailedEx ex) { 743 throw new RuntimeException("Unable to connect to zygote for abi: " + abi, ex); 744 } 745 } 746 747 /** 748 * Tries to open socket to Zygote process if not already open. If 749 * already open, does nothing. May block and retry. 750 */ 751 private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx { 752 if (primaryZygoteState == null || primaryZygoteState.isClosed()) { 753 try { 754 primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET); 755 } catch (IOException ioe) { 756 throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe); 757 } 758 } 759 760 if (primaryZygoteState.matches(abi)) { 761 return primaryZygoteState; 762 } 763 764 // The primary zygote didn't match. Try the secondary. 765 if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { 766 try { 767 secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET); 768 } catch (IOException ioe) { 769 throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe); 770 } 771 } 772 773 if (secondaryZygoteState.matches(abi)) { 774 return secondaryZygoteState; 775 } 776 777 throw new ZygoteStartFailedEx("Unsupported zygote ABI: " + abi); 778 } 779 780 /** 781 * Returns elapsed milliseconds of the time this process has run. 782 * @return Returns the number of milliseconds this process has return. 783 */ 784 public static final native long getElapsedCpuTime(); 785 786 /** 787 * Return the {@link SystemClock#elapsedRealtime()} at which this process was started. 788 */ 789 public static final long getStartElapsedRealtime() { 790 return sStartElapsedRealtime; 791 } 792 793 /** 794 * Return the {@link SystemClock#uptimeMillis()} at which this process was started. 795 */ 796 public static final long getStartUptimeMillis() { 797 return sStartUptimeMillis; 798 } 799 800 /** @hide */ 801 public static final void setStartTimes(long elapsedRealtime, long uptimeMillis) { 802 sStartElapsedRealtime = elapsedRealtime; 803 sStartUptimeMillis = uptimeMillis; 804 } 805 806 /** 807 * Returns true if the current process is a 64-bit runtime. 808 */ 809 public static final boolean is64Bit() { 810 return VMRuntime.getRuntime().is64Bit(); 811 } 812 813 /** 814 * Returns the identifier of this process, which can be used with 815 * {@link #killProcess} and {@link #sendSignal}. 816 */ 817 public static final int myPid() { 818 return Os.getpid(); 819 } 820 821 /** 822 * Returns the identifier of this process' parent. 823 * @hide 824 */ 825 public static final int myPpid() { 826 return Os.getppid(); 827 } 828 829 /** 830 * Returns the identifier of the calling thread, which be used with 831 * {@link #setThreadPriority(int, int)}. 832 */ 833 public static final int myTid() { 834 return Os.gettid(); 835 } 836 837 /** 838 * Returns the identifier of this process's uid. This is the kernel uid 839 * that the process is running under, which is the identity of its 840 * app-specific sandbox. It is different from {@link #myUserHandle} in that 841 * a uid identifies a specific app sandbox in a specific user. 842 */ 843 public static final int myUid() { 844 return Os.getuid(); 845 } 846 847 /** 848 * Returns this process's user handle. This is the 849 * user the process is running under. It is distinct from 850 * {@link #myUid()} in that a particular user will have multiple 851 * distinct apps running under it each with their own uid. 852 */ 853 public static UserHandle myUserHandle() { 854 return UserHandle.of(UserHandle.getUserId(myUid())); 855 } 856 857 /** 858 * Returns whether the given uid belongs to an application. 859 * @param uid A kernel uid. 860 * @return Whether the uid corresponds to an application sandbox running in 861 * a specific user. 862 */ 863 public static boolean isApplicationUid(int uid) { 864 return UserHandle.isApp(uid); 865 } 866 867 /** 868 * Returns whether the current process is in an isolated sandbox. 869 * @hide 870 */ 871 public static final boolean isIsolated() { 872 return isIsolated(myUid()); 873 } 874 875 /** {@hide} */ 876 public static final boolean isIsolated(int uid) { 877 uid = UserHandle.getAppId(uid); 878 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 879 } 880 881 /** 882 * Returns the UID assigned to a particular user name, or -1 if there is 883 * none. If the given string consists of only numbers, it is converted 884 * directly to a uid. 885 */ 886 public static final native int getUidForName(String name); 887 888 /** 889 * Returns the GID assigned to a particular user name, or -1 if there is 890 * none. If the given string consists of only numbers, it is converted 891 * directly to a gid. 892 */ 893 public static final native int getGidForName(String name); 894 895 /** 896 * Returns a uid for a currently running process. 897 * @param pid the process id 898 * @return the uid of the process, or -1 if the process is not running. 899 * @hide pending API council review 900 */ 901 public static final int getUidForPid(int pid) { 902 String[] procStatusLabels = { "Uid:" }; 903 long[] procStatusValues = new long[1]; 904 procStatusValues[0] = -1; 905 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 906 return (int) procStatusValues[0]; 907 } 908 909 /** 910 * Returns the parent process id for a currently running process. 911 * @param pid the process id 912 * @return the parent process id of the process, or -1 if the process is not running. 913 * @hide 914 */ 915 public static final int getParentPid(int pid) { 916 String[] procStatusLabels = { "PPid:" }; 917 long[] procStatusValues = new long[1]; 918 procStatusValues[0] = -1; 919 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 920 return (int) procStatusValues[0]; 921 } 922 923 /** 924 * Returns the thread group leader id for a currently running thread. 925 * @param tid the thread id 926 * @return the thread group leader id of the thread, or -1 if the thread is not running. 927 * This is same as what getpid(2) would return if called by tid. 928 * @hide 929 */ 930 public static final int getThreadGroupLeader(int tid) { 931 String[] procStatusLabels = { "Tgid:" }; 932 long[] procStatusValues = new long[1]; 933 procStatusValues[0] = -1; 934 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 935 return (int) procStatusValues[0]; 936 } 937 938 /** 939 * Set the priority of a thread, based on Linux priorities. 940 * 941 * @param tid The identifier of the thread/process to change. 942 * @param priority A Linux priority level, from -20 for highest scheduling 943 * priority to 19 for lowest scheduling priority. 944 * 945 * @throws IllegalArgumentException Throws IllegalArgumentException if 946 * <var>tid</var> does not exist. 947 * @throws SecurityException Throws SecurityException if your process does 948 * not have permission to modify the given thread, or to use the given 949 * priority. 950 */ 951 public static final native void setThreadPriority(int tid, int priority) 952 throws IllegalArgumentException, SecurityException; 953 954 /** 955 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 956 * throw an exception if passed a background-level thread priority. This is only 957 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 958 * 959 * @hide 960 */ 961 public static final native void setCanSelfBackground(boolean backgroundOk); 962 963 /** 964 * Sets the scheduling group for a thread. 965 * @hide 966 * @param tid The identifier of the thread to change. 967 * @param group The target group for this thread from THREAD_GROUP_*. 968 * 969 * @throws IllegalArgumentException Throws IllegalArgumentException if 970 * <var>tid</var> does not exist. 971 * @throws SecurityException Throws SecurityException if your process does 972 * not have permission to modify the given thread, or to use the given 973 * priority. 974 * If the thread is a thread group leader, that is it's gettid() == getpid(), 975 * then the other threads in the same thread group are _not_ affected. 976 */ 977 public static final native void setThreadGroup(int tid, int group) 978 throws IllegalArgumentException, SecurityException; 979 980 /** 981 * Sets the scheduling group for a process and all child threads 982 * @hide 983 * @param pid The identifier of the process to change. 984 * @param group The target group for this process from THREAD_GROUP_*. 985 * 986 * @throws IllegalArgumentException Throws IllegalArgumentException if 987 * <var>tid</var> does not exist. 988 * @throws SecurityException Throws SecurityException if your process does 989 * not have permission to modify the given thread, or to use the given 990 * priority. 991 * 992 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 993 * threads to the foreground scheduling group, but to leave background 994 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 995 * threads, regardless of priority, to the background scheduling group. 996 * group == THREAD_GROUP_FOREGROUND is not allowed. 997 */ 998 public static final native void setProcessGroup(int pid, int group) 999 throws IllegalArgumentException, SecurityException; 1000 1001 /** 1002 * Return the scheduling group of requested process. 1003 * 1004 * @hide 1005 */ 1006 public static final native int getProcessGroup(int pid) 1007 throws IllegalArgumentException, SecurityException; 1008 1009 /** 1010 * On some devices, the foreground process may have one or more CPU 1011 * cores exclusively reserved for it. This method can be used to 1012 * retrieve which cores that are (if any), so the calling process 1013 * can then use sched_setaffinity() to lock a thread to these cores. 1014 * Note that the calling process must currently be running in the 1015 * foreground for this method to return any cores. 1016 * 1017 * The CPU core(s) exclusively reserved for the foreground process will 1018 * stay reserved for as long as the process stays in the foreground. 1019 * 1020 * As soon as a process leaves the foreground, those CPU cores will 1021 * no longer be reserved for it, and will most likely be reserved for 1022 * the new foreground process. It's not necessary to change the affinity 1023 * of your process when it leaves the foreground (if you had previously 1024 * set it to use a reserved core); the OS will automatically take care 1025 * of resetting the affinity at that point. 1026 * 1027 * @return an array of integers, indicating the CPU cores exclusively 1028 * reserved for this process. The array will have length zero if no 1029 * CPU cores are exclusively reserved for this process at this point 1030 * in time. 1031 */ 1032 public static final native int[] getExclusiveCores(); 1033 1034 /** 1035 * Set the priority of the calling thread, based on Linux priorities. See 1036 * {@link #setThreadPriority(int, int)} for more information. 1037 * 1038 * @param priority A Linux priority level, from -20 for highest scheduling 1039 * priority to 19 for lowest scheduling priority. 1040 * 1041 * @throws IllegalArgumentException Throws IllegalArgumentException if 1042 * <var>tid</var> does not exist. 1043 * @throws SecurityException Throws SecurityException if your process does 1044 * not have permission to modify the given thread, or to use the given 1045 * priority. 1046 * 1047 * @see #setThreadPriority(int, int) 1048 */ 1049 public static final native void setThreadPriority(int priority) 1050 throws IllegalArgumentException, SecurityException; 1051 1052 /** 1053 * Return the current priority of a thread, based on Linux priorities. 1054 * 1055 * @param tid The identifier of the thread/process to change. 1056 * 1057 * @return Returns the current priority, as a Linux priority level, 1058 * from -20 for highest scheduling priority to 19 for lowest scheduling 1059 * priority. 1060 * 1061 * @throws IllegalArgumentException Throws IllegalArgumentException if 1062 * <var>tid</var> does not exist. 1063 */ 1064 public static final native int getThreadPriority(int tid) 1065 throws IllegalArgumentException; 1066 1067 /** 1068 * Set the scheduling policy and priority of a thread, based on Linux. 1069 * 1070 * @param tid The identifier of the thread/process to change. 1071 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 1072 * @param priority A Linux priority level in a range appropriate for the given policy. 1073 * 1074 * @throws IllegalArgumentException Throws IllegalArgumentException if 1075 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 1076 * @throws SecurityException Throws SecurityException if your process does 1077 * not have permission to modify the given thread, or to use the given 1078 * scheduling policy or priority. 1079 * 1080 * {@hide} 1081 */ 1082 public static final native void setThreadScheduler(int tid, int policy, int priority) 1083 throws IllegalArgumentException; 1084 1085 /** 1086 * Determine whether the current environment supports multiple processes. 1087 * 1088 * @return Returns true if the system can run in multiple processes, else 1089 * false if everything is running in a single process. 1090 * 1091 * @deprecated This method always returns true. Do not use. 1092 */ 1093 @Deprecated 1094 public static final boolean supportsProcesses() { 1095 return true; 1096 } 1097 1098 /** 1099 * Adjust the swappiness level for a process. 1100 * 1101 * @param pid The process identifier to set. 1102 * @param is_increased Whether swappiness should be increased or default. 1103 * 1104 * @return Returns true if the underlying system supports this 1105 * feature, else false. 1106 * 1107 * {@hide} 1108 */ 1109 public static final native boolean setSwappiness(int pid, boolean is_increased); 1110 1111 /** 1112 * Change this process's argv[0] parameter. This can be useful to show 1113 * more descriptive information in things like the 'ps' command. 1114 * 1115 * @param text The new name of this process. 1116 * 1117 * {@hide} 1118 */ 1119 public static final native void setArgV0(String text); 1120 1121 /** 1122 * Kill the process with the given PID. 1123 * Note that, though this API allows us to request to 1124 * kill any process based on its PID, the kernel will 1125 * still impose standard restrictions on which PIDs you 1126 * are actually able to kill. Typically this means only 1127 * the process running the caller's packages/application 1128 * and any additional processes created by that app; packages 1129 * sharing a common UID will also be able to kill each 1130 * other's processes. 1131 */ 1132 public static final void killProcess(int pid) { 1133 sendSignal(pid, SIGNAL_KILL); 1134 } 1135 1136 /** @hide */ 1137 public static final native int setUid(int uid); 1138 1139 /** @hide */ 1140 public static final native int setGid(int uid); 1141 1142 /** 1143 * Send a signal to the given process. 1144 * 1145 * @param pid The pid of the target process. 1146 * @param signal The signal to send. 1147 */ 1148 public static final native void sendSignal(int pid, int signal); 1149 1150 /** 1151 * @hide 1152 * Private impl for avoiding a log message... DO NOT USE without doing 1153 * your own log, or the Android Illuminati will find you some night and 1154 * beat you up. 1155 */ 1156 public static final void killProcessQuiet(int pid) { 1157 sendSignalQuiet(pid, SIGNAL_KILL); 1158 } 1159 1160 /** 1161 * @hide 1162 * Private impl for avoiding a log message... DO NOT USE without doing 1163 * your own log, or the Android Illuminati will find you some night and 1164 * beat you up. 1165 */ 1166 public static final native void sendSignalQuiet(int pid, int signal); 1167 1168 /** @hide */ 1169 public static final native long getFreeMemory(); 1170 1171 /** @hide */ 1172 public static final native long getTotalMemory(); 1173 1174 /** @hide */ 1175 public static final native void readProcLines(String path, 1176 String[] reqFields, long[] outSizes); 1177 1178 /** @hide */ 1179 public static final native int[] getPids(String path, int[] lastArray); 1180 1181 /** @hide */ 1182 public static final int PROC_TERM_MASK = 0xff; 1183 /** @hide */ 1184 public static final int PROC_ZERO_TERM = 0; 1185 /** @hide */ 1186 public static final int PROC_SPACE_TERM = (int)' '; 1187 /** @hide */ 1188 public static final int PROC_TAB_TERM = (int)'\t'; 1189 /** @hide */ 1190 public static final int PROC_COMBINE = 0x100; 1191 /** @hide */ 1192 public static final int PROC_PARENS = 0x200; 1193 /** @hide */ 1194 public static final int PROC_QUOTES = 0x400; 1195 /** @hide */ 1196 public static final int PROC_CHAR = 0x800; 1197 /** @hide */ 1198 public static final int PROC_OUT_STRING = 0x1000; 1199 /** @hide */ 1200 public static final int PROC_OUT_LONG = 0x2000; 1201 /** @hide */ 1202 public static final int PROC_OUT_FLOAT = 0x4000; 1203 1204 /** @hide */ 1205 public static final native boolean readProcFile(String file, int[] format, 1206 String[] outStrings, long[] outLongs, float[] outFloats); 1207 1208 /** @hide */ 1209 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 1210 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 1211 1212 /** @hide */ 1213 public static final native int[] getPidsForCommands(String[] cmds); 1214 1215 /** 1216 * Gets the total Pss value for a given process, in bytes. 1217 * 1218 * @param pid the process to the Pss for 1219 * @return the total Pss value for the given process in bytes, 1220 * or -1 if the value cannot be determined 1221 * @hide 1222 */ 1223 public static final native long getPss(int pid); 1224 1225 /** 1226 * Specifies the outcome of having started a process. 1227 * @hide 1228 */ 1229 public static final class ProcessStartResult { 1230 /** 1231 * The PID of the newly started process. 1232 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1233 */ 1234 public int pid; 1235 1236 /** 1237 * True if the process was started with a wrapper attached. 1238 */ 1239 public boolean usingWrapper; 1240 } 1241 1242 /** 1243 * Kill all processes in a process group started for the given 1244 * pid. 1245 * @hide 1246 */ 1247 public static final native int killProcessGroup(int uid, int pid); 1248 1249 /** 1250 * Remove all process groups. Expected to be called when ActivityManager 1251 * is restarted. 1252 * @hide 1253 */ 1254 public static final native void removeAllProcessGroups(); 1255} 1256