Process.java revision 48aa86bd0b30815f4c02561f713bd33b032ef2b7
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 /** 387 * State for communicating with the zygote process. 388 * 389 * @hide for internal use only. 390 */ 391 public static class ZygoteState { 392 final LocalSocket socket; 393 final DataInputStream inputStream; 394 final BufferedWriter writer; 395 final List<String> abiList; 396 397 boolean mClosed; 398 399 private ZygoteState(LocalSocket socket, DataInputStream inputStream, 400 BufferedWriter writer, List<String> abiList) { 401 this.socket = socket; 402 this.inputStream = inputStream; 403 this.writer = writer; 404 this.abiList = abiList; 405 } 406 407 public static ZygoteState connect(String socketAddress) throws IOException { 408 DataInputStream zygoteInputStream = null; 409 BufferedWriter zygoteWriter = null; 410 final LocalSocket zygoteSocket = new LocalSocket(); 411 412 try { 413 zygoteSocket.connect(new LocalSocketAddress(socketAddress, 414 LocalSocketAddress.Namespace.RESERVED)); 415 416 zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); 417 418 zygoteWriter = new BufferedWriter(new OutputStreamWriter( 419 zygoteSocket.getOutputStream()), 256); 420 } catch (IOException ex) { 421 try { 422 zygoteSocket.close(); 423 } catch (IOException ignore) { 424 } 425 426 throw ex; 427 } 428 429 String abiListString = getAbiList(zygoteWriter, zygoteInputStream); 430 Log.i("Zygote", "Process: zygote socket opened, supported ABIS: " + abiListString); 431 432 return new ZygoteState(zygoteSocket, zygoteInputStream, zygoteWriter, 433 Arrays.asList(abiListString.split(","))); 434 } 435 436 boolean matches(String abi) { 437 return abiList.contains(abi); 438 } 439 440 public void close() { 441 try { 442 socket.close(); 443 } catch (IOException ex) { 444 Log.e(LOG_TAG,"I/O exception on routine close", ex); 445 } 446 447 mClosed = true; 448 } 449 450 boolean isClosed() { 451 return mClosed; 452 } 453 } 454 455 /** 456 * The state of the connection to the primary zygote. 457 */ 458 static ZygoteState primaryZygoteState; 459 460 /** 461 * The state of the connection to the secondary zygote. 462 */ 463 static ZygoteState secondaryZygoteState; 464 465 /** 466 * Start a new process. 467 * 468 * <p>If processes are enabled, a new process is created and the 469 * static main() function of a <var>processClass</var> is executed there. 470 * The process will continue running after this function returns. 471 * 472 * <p>If processes are not enabled, a new thread in the caller's 473 * process is created and main() of <var>processClass</var> called there. 474 * 475 * <p>The niceName parameter, if not an empty string, is a custom name to 476 * give to the process instead of using processClass. This allows you to 477 * make easily identifyable processes even if you are using the same base 478 * <var>processClass</var> to start them. 479 * 480 * @param processClass The class to use as the process's main entry 481 * point. 482 * @param niceName A more readable name to use for the process. 483 * @param uid The user-id under which the process will run. 484 * @param gid The group-id under which the process will run. 485 * @param gids Additional group-ids associated with the process. 486 * @param debugFlags Additional flags. 487 * @param targetSdkVersion The target SDK version for the app. 488 * @param seInfo null-ok SELinux information for the new process. 489 * @param abi non-null the ABI this app should be started with. 490 * @param instructionSet null-ok the instruction set to use. 491 * @param appDataDir null-ok the data directory of the app. 492 * @param zygoteArgs Additional arguments to supply to the zygote process. 493 * 494 * @return An object that describes the result of the attempt to start the process. 495 * @throws RuntimeException on fatal start failure 496 * 497 * {@hide} 498 */ 499 public static final ProcessStartResult start(final String processClass, 500 final String niceName, 501 int uid, int gid, int[] gids, 502 int debugFlags, int mountExternal, 503 int targetSdkVersion, 504 String seInfo, 505 String abi, 506 String instructionSet, 507 String appDataDir, 508 String[] zygoteArgs) { 509 try { 510 return startViaZygote(processClass, niceName, uid, gid, gids, 511 debugFlags, mountExternal, targetSdkVersion, seInfo, 512 abi, instructionSet, appDataDir, zygoteArgs); 513 } catch (ZygoteStartFailedEx ex) { 514 Log.e(LOG_TAG, 515 "Starting VM process through Zygote failed"); 516 throw new RuntimeException( 517 "Starting VM process through Zygote failed", ex); 518 } 519 } 520 521 /** retry interval for opening a zygote socket */ 522 static final int ZYGOTE_RETRY_MILLIS = 500; 523 524 /** 525 * Queries the zygote for the list of ABIS it supports. 526 * 527 * @throws ZygoteStartFailedEx if the query failed. 528 */ 529 private static String getAbiList(BufferedWriter writer, DataInputStream inputStream) 530 throws IOException { 531 // Each query starts with the argument count (1 in this case) 532 writer.write("1"); 533 // ... followed by a new-line. 534 writer.newLine(); 535 // ... followed by our only argument. 536 writer.write("--query-abi-list"); 537 writer.newLine(); 538 writer.flush(); 539 540 // The response is a length prefixed stream of ASCII bytes. 541 int numBytes = inputStream.readInt(); 542 byte[] bytes = new byte[numBytes]; 543 inputStream.readFully(bytes); 544 545 return new String(bytes, StandardCharsets.US_ASCII); 546 } 547 548 /** 549 * Sends an argument list to the zygote process, which starts a new child 550 * and returns the child's pid. Please note: the present implementation 551 * replaces newlines in the argument list with spaces. 552 * 553 * @throws ZygoteStartFailedEx if process start failed for any reason 554 */ 555 private static ProcessStartResult zygoteSendArgsAndGetResult( 556 ZygoteState zygoteState, ArrayList<String> args) 557 throws ZygoteStartFailedEx { 558 try { 559 /** 560 * See com.android.internal.os.ZygoteInit.readArgumentList() 561 * Presently the wire format to the zygote process is: 562 * a) a count of arguments (argc, in essence) 563 * b) a number of newline-separated argument strings equal to count 564 * 565 * After the zygote process reads these it will write the pid of 566 * the child or -1 on failure, followed by boolean to 567 * indicate whether a wrapper process was used. 568 */ 569 final BufferedWriter writer = zygoteState.writer; 570 final DataInputStream inputStream = zygoteState.inputStream; 571 572 writer.write(Integer.toString(args.size())); 573 writer.newLine(); 574 575 int sz = args.size(); 576 for (int i = 0; i < sz; i++) { 577 String arg = args.get(i); 578 if (arg.indexOf('\n') >= 0) { 579 throw new ZygoteStartFailedEx( 580 "embedded newlines not allowed"); 581 } 582 writer.write(arg); 583 writer.newLine(); 584 } 585 586 writer.flush(); 587 588 // Should there be a timeout on this? 589 ProcessStartResult result = new ProcessStartResult(); 590 result.pid = inputStream.readInt(); 591 if (result.pid < 0) { 592 throw new ZygoteStartFailedEx("fork() failed"); 593 } 594 result.usingWrapper = inputStream.readBoolean(); 595 return result; 596 } catch (IOException ex) { 597 zygoteState.close(); 598 throw new ZygoteStartFailedEx(ex); 599 } 600 } 601 602 /** 603 * Starts a new process via the zygote mechanism. 604 * 605 * @param processClass Class name whose static main() to run 606 * @param niceName 'nice' process name to appear in ps 607 * @param uid a POSIX uid that the new process should setuid() to 608 * @param gid a POSIX gid that the new process shuold setgid() to 609 * @param gids null-ok; a list of supplementary group IDs that the 610 * new process should setgroup() to. 611 * @param debugFlags Additional flags. 612 * @param targetSdkVersion The target SDK version for the app. 613 * @param seInfo null-ok SELinux information for the new process. 614 * @param abi the ABI the process should use. 615 * @param instructionSet null-ok the instruction set to use. 616 * @param appDataDir null-ok the data directory of the app. 617 * @param extraArgs Additional arguments to supply to the zygote process. 618 * @return An object that describes the result of the attempt to start the process. 619 * @throws ZygoteStartFailedEx if process start failed for any reason 620 */ 621 private static ProcessStartResult startViaZygote(final String processClass, 622 final String niceName, 623 final int uid, final int gid, 624 final int[] gids, 625 int debugFlags, int mountExternal, 626 int targetSdkVersion, 627 String seInfo, 628 String abi, 629 String instructionSet, 630 String appDataDir, 631 String[] extraArgs) 632 throws ZygoteStartFailedEx { 633 synchronized(Process.class) { 634 ArrayList<String> argsForZygote = new ArrayList<String>(); 635 636 // --runtime-args, --setuid=, --setgid=, 637 // and --setgroups= must go first 638 argsForZygote.add("--runtime-args"); 639 argsForZygote.add("--setuid=" + uid); 640 argsForZygote.add("--setgid=" + gid); 641 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 642 argsForZygote.add("--enable-jni-logging"); 643 } 644 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 645 argsForZygote.add("--enable-safemode"); 646 } 647 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 648 argsForZygote.add("--enable-debugger"); 649 } 650 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 651 argsForZygote.add("--enable-checkjni"); 652 } 653 if ((debugFlags & Zygote.DEBUG_GENERATE_DEBUG_INFO) != 0) { 654 argsForZygote.add("--generate-debug-info"); 655 } 656 if ((debugFlags & Zygote.DEBUG_ALWAYS_JIT) != 0) { 657 argsForZygote.add("--always-jit"); 658 } 659 if ((debugFlags & Zygote.DEBUG_NATIVE_DEBUGGABLE) != 0) { 660 argsForZygote.add("--native-debuggable"); 661 } 662 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 663 argsForZygote.add("--enable-assert"); 664 } 665 if (mountExternal == Zygote.MOUNT_EXTERNAL_DEFAULT) { 666 argsForZygote.add("--mount-external-default"); 667 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_READ) { 668 argsForZygote.add("--mount-external-read"); 669 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_WRITE) { 670 argsForZygote.add("--mount-external-write"); 671 } 672 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 673 674 //TODO optionally enable debuger 675 //argsForZygote.add("--enable-debugger"); 676 677 // --setgroups is a comma-separated list 678 if (gids != null && gids.length > 0) { 679 StringBuilder sb = new StringBuilder(); 680 sb.append("--setgroups="); 681 682 int sz = gids.length; 683 for (int i = 0; i < sz; i++) { 684 if (i != 0) { 685 sb.append(','); 686 } 687 sb.append(gids[i]); 688 } 689 690 argsForZygote.add(sb.toString()); 691 } 692 693 if (niceName != null) { 694 argsForZygote.add("--nice-name=" + niceName); 695 } 696 697 if (seInfo != null) { 698 argsForZygote.add("--seinfo=" + seInfo); 699 } 700 701 if (instructionSet != null) { 702 argsForZygote.add("--instruction-set=" + instructionSet); 703 } 704 705 if (appDataDir != null) { 706 argsForZygote.add("--app-data-dir=" + appDataDir); 707 } 708 709 argsForZygote.add(processClass); 710 711 if (extraArgs != null) { 712 for (String arg : extraArgs) { 713 argsForZygote.add(arg); 714 } 715 } 716 717 return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); 718 } 719 } 720 721 /** 722 * Tries to establish a connection to the zygote that handles a given {@code abi}. Might block and retry if the 723 * zygote is unresponsive. This method is a no-op if a connection is already open. 724 * 725 * @hide 726 */ 727 public static void establishZygoteConnectionForAbi(String abi) { 728 try { 729 openZygoteSocketIfNeeded(abi); 730 } catch (ZygoteStartFailedEx ex) { 731 throw new RuntimeException("Unable to connect to zygote for abi: " + abi, ex); 732 } 733 } 734 735 /** 736 * Tries to open socket to Zygote process if not already open. If 737 * already open, does nothing. May block and retry. 738 */ 739 private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx { 740 if (primaryZygoteState == null || primaryZygoteState.isClosed()) { 741 try { 742 primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET); 743 } catch (IOException ioe) { 744 throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe); 745 } 746 } 747 748 if (primaryZygoteState.matches(abi)) { 749 return primaryZygoteState; 750 } 751 752 // The primary zygote didn't match. Try the secondary. 753 if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { 754 try { 755 secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET); 756 } catch (IOException ioe) { 757 throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe); 758 } 759 } 760 761 if (secondaryZygoteState.matches(abi)) { 762 return secondaryZygoteState; 763 } 764 765 throw new ZygoteStartFailedEx("Unsupported zygote ABI: " + abi); 766 } 767 768 /** 769 * Returns elapsed milliseconds of the time this process has run. 770 * @return Returns the number of milliseconds this process has return. 771 */ 772 public static final native long getElapsedCpuTime(); 773 774 /** 775 * Returns true if the current process is a 64-bit runtime. 776 */ 777 public static final boolean is64Bit() { 778 return VMRuntime.getRuntime().is64Bit(); 779 } 780 781 /** 782 * Returns the identifier of this process, which can be used with 783 * {@link #killProcess} and {@link #sendSignal}. 784 */ 785 public static final int myPid() { 786 return Os.getpid(); 787 } 788 789 /** 790 * Returns the identifier of this process' parent. 791 * @hide 792 */ 793 public static final int myPpid() { 794 return Os.getppid(); 795 } 796 797 /** 798 * Returns the identifier of the calling thread, which be used with 799 * {@link #setThreadPriority(int, int)}. 800 */ 801 public static final int myTid() { 802 return Os.gettid(); 803 } 804 805 /** 806 * Returns the identifier of this process's uid. This is the kernel uid 807 * that the process is running under, which is the identity of its 808 * app-specific sandbox. It is different from {@link #myUserHandle} in that 809 * a uid identifies a specific app sandbox in a specific user. 810 */ 811 public static final int myUid() { 812 return Os.getuid(); 813 } 814 815 /** 816 * Returns this process's user handle. This is the 817 * user the process is running under. It is distinct from 818 * {@link #myUid()} in that a particular user will have multiple 819 * distinct apps running under it each with their own uid. 820 */ 821 public static UserHandle myUserHandle() { 822 return UserHandle.of(UserHandle.getUserId(myUid())); 823 } 824 825 /** 826 * Returns whether the given uid belongs to an application. 827 * @param uid A kernel uid. 828 * @return Whether the uid corresponds to an application sandbox running in 829 * a specific user. 830 */ 831 public static boolean isApplicationUid(int uid) { 832 return UserHandle.isApp(uid); 833 } 834 835 /** 836 * Returns whether the current process is in an isolated sandbox. 837 * @hide 838 */ 839 public static final boolean isIsolated() { 840 return isIsolated(myUid()); 841 } 842 843 /** {@hide} */ 844 public static final boolean isIsolated(int uid) { 845 uid = UserHandle.getAppId(uid); 846 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 847 } 848 849 /** 850 * Returns the UID assigned to a particular user name, or -1 if there is 851 * none. If the given string consists of only numbers, it is converted 852 * directly to a uid. 853 */ 854 public static final native int getUidForName(String name); 855 856 /** 857 * Returns the GID assigned to a particular user name, or -1 if there is 858 * none. If the given string consists of only numbers, it is converted 859 * directly to a gid. 860 */ 861 public static final native int getGidForName(String name); 862 863 /** 864 * Returns a uid for a currently running process. 865 * @param pid the process id 866 * @return the uid of the process, or -1 if the process is not running. 867 * @hide pending API council review 868 */ 869 public static final int getUidForPid(int pid) { 870 String[] procStatusLabels = { "Uid:" }; 871 long[] procStatusValues = new long[1]; 872 procStatusValues[0] = -1; 873 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 874 return (int) procStatusValues[0]; 875 } 876 877 /** 878 * Returns the parent process id for a currently running process. 879 * @param pid the process id 880 * @return the parent process id of the process, or -1 if the process is not running. 881 * @hide 882 */ 883 public static final int getParentPid(int pid) { 884 String[] procStatusLabels = { "PPid:" }; 885 long[] procStatusValues = new long[1]; 886 procStatusValues[0] = -1; 887 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 888 return (int) procStatusValues[0]; 889 } 890 891 /** 892 * Returns the thread group leader id for a currently running thread. 893 * @param tid the thread id 894 * @return the thread group leader id of the thread, or -1 if the thread is not running. 895 * This is same as what getpid(2) would return if called by tid. 896 * @hide 897 */ 898 public static final int getThreadGroupLeader(int tid) { 899 String[] procStatusLabels = { "Tgid:" }; 900 long[] procStatusValues = new long[1]; 901 procStatusValues[0] = -1; 902 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 903 return (int) procStatusValues[0]; 904 } 905 906 /** 907 * Set the priority of a thread, based on Linux priorities. 908 * 909 * @param tid The identifier of the thread/process to change. 910 * @param priority A Linux priority level, from -20 for highest scheduling 911 * priority to 19 for lowest scheduling priority. 912 * 913 * @throws IllegalArgumentException Throws IllegalArgumentException if 914 * <var>tid</var> does not exist. 915 * @throws SecurityException Throws SecurityException if your process does 916 * not have permission to modify the given thread, or to use the given 917 * priority. 918 */ 919 public static final native void setThreadPriority(int tid, int priority) 920 throws IllegalArgumentException, SecurityException; 921 922 /** 923 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 924 * throw an exception if passed a background-level thread priority. This is only 925 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 926 * 927 * @hide 928 */ 929 public static final native void setCanSelfBackground(boolean backgroundOk); 930 931 /** 932 * Sets the scheduling group for a thread. 933 * @hide 934 * @param tid The identifier of the thread to change. 935 * @param group The target group for this thread from THREAD_GROUP_*. 936 * 937 * @throws IllegalArgumentException Throws IllegalArgumentException if 938 * <var>tid</var> does not exist. 939 * @throws SecurityException Throws SecurityException if your process does 940 * not have permission to modify the given thread, or to use the given 941 * priority. 942 * If the thread is a thread group leader, that is it's gettid() == getpid(), 943 * then the other threads in the same thread group are _not_ affected. 944 */ 945 public static final native void setThreadGroup(int tid, int group) 946 throws IllegalArgumentException, SecurityException; 947 948 /** 949 * Sets the scheduling group for a process and all child threads 950 * @hide 951 * @param pid The identifier of the process to change. 952 * @param group The target group for this process from THREAD_GROUP_*. 953 * 954 * @throws IllegalArgumentException Throws IllegalArgumentException if 955 * <var>tid</var> does not exist. 956 * @throws SecurityException Throws SecurityException if your process does 957 * not have permission to modify the given thread, or to use the given 958 * priority. 959 * 960 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 961 * threads to the foreground scheduling group, but to leave background 962 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 963 * threads, regardless of priority, to the background scheduling group. 964 * group == THREAD_GROUP_FOREGROUND is not allowed. 965 */ 966 public static final native void setProcessGroup(int pid, int group) 967 throws IllegalArgumentException, SecurityException; 968 969 /** 970 * Return the scheduling group of requested process. 971 * 972 * @hide 973 */ 974 public static final native int getProcessGroup(int pid) 975 throws IllegalArgumentException, SecurityException; 976 977 /** 978 * Set the priority of the calling thread, based on Linux priorities. See 979 * {@link #setThreadPriority(int, int)} for more information. 980 * 981 * @param priority A Linux priority level, from -20 for highest scheduling 982 * priority to 19 for lowest scheduling priority. 983 * 984 * @throws IllegalArgumentException Throws IllegalArgumentException if 985 * <var>tid</var> does not exist. 986 * @throws SecurityException Throws SecurityException if your process does 987 * not have permission to modify the given thread, or to use the given 988 * priority. 989 * 990 * @see #setThreadPriority(int, int) 991 */ 992 public static final native void setThreadPriority(int priority) 993 throws IllegalArgumentException, SecurityException; 994 995 /** 996 * Return the current priority of a thread, based on Linux priorities. 997 * 998 * @param tid The identifier of the thread/process to change. 999 * 1000 * @return Returns the current priority, as a Linux priority level, 1001 * from -20 for highest scheduling priority to 19 for lowest scheduling 1002 * priority. 1003 * 1004 * @throws IllegalArgumentException Throws IllegalArgumentException if 1005 * <var>tid</var> does not exist. 1006 */ 1007 public static final native int getThreadPriority(int tid) 1008 throws IllegalArgumentException; 1009 1010 /** 1011 * Set the scheduling policy and priority of a thread, based on Linux. 1012 * 1013 * @param tid The identifier of the thread/process to change. 1014 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 1015 * @param priority A Linux priority level in a range appropriate for the given policy. 1016 * 1017 * @throws IllegalArgumentException Throws IllegalArgumentException if 1018 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 1019 * @throws SecurityException Throws SecurityException if your process does 1020 * not have permission to modify the given thread, or to use the given 1021 * scheduling policy or priority. 1022 * 1023 * {@hide} 1024 */ 1025 public static final native void setThreadScheduler(int tid, int policy, int priority) 1026 throws IllegalArgumentException; 1027 1028 /** 1029 * Determine whether the current environment supports multiple processes. 1030 * 1031 * @return Returns true if the system can run in multiple processes, else 1032 * false if everything is running in a single process. 1033 * 1034 * @deprecated This method always returns true. Do not use. 1035 */ 1036 @Deprecated 1037 public static final boolean supportsProcesses() { 1038 return true; 1039 } 1040 1041 /** 1042 * Adjust the swappiness level for a process. 1043 * 1044 * @param pid The process identifier to set. 1045 * @param is_increased Whether swappiness should be increased or default. 1046 * 1047 * @return Returns true if the underlying system supports this 1048 * feature, else false. 1049 * 1050 * {@hide} 1051 */ 1052 public static final native boolean setSwappiness(int pid, boolean is_increased); 1053 1054 /** 1055 * Change this process's argv[0] parameter. This can be useful to show 1056 * more descriptive information in things like the 'ps' command. 1057 * 1058 * @param text The new name of this process. 1059 * 1060 * {@hide} 1061 */ 1062 public static final native void setArgV0(String text); 1063 1064 /** 1065 * Kill the process with the given PID. 1066 * Note that, though this API allows us to request to 1067 * kill any process based on its PID, the kernel will 1068 * still impose standard restrictions on which PIDs you 1069 * are actually able to kill. Typically this means only 1070 * the process running the caller's packages/application 1071 * and any additional processes created by that app; packages 1072 * sharing a common UID will also be able to kill each 1073 * other's processes. 1074 */ 1075 public static final void killProcess(int pid) { 1076 sendSignal(pid, SIGNAL_KILL); 1077 } 1078 1079 /** @hide */ 1080 public static final native int setUid(int uid); 1081 1082 /** @hide */ 1083 public static final native int setGid(int uid); 1084 1085 /** 1086 * Send a signal to the given process. 1087 * 1088 * @param pid The pid of the target process. 1089 * @param signal The signal to send. 1090 */ 1091 public static final native void sendSignal(int pid, int signal); 1092 1093 /** 1094 * @hide 1095 * Private impl for avoiding a log message... DO NOT USE without doing 1096 * your own log, or the Android Illuminati will find you some night and 1097 * beat you up. 1098 */ 1099 public static final void killProcessQuiet(int pid) { 1100 sendSignalQuiet(pid, SIGNAL_KILL); 1101 } 1102 1103 /** 1104 * @hide 1105 * Private impl for avoiding a log message... DO NOT USE without doing 1106 * your own log, or the Android Illuminati will find you some night and 1107 * beat you up. 1108 */ 1109 public static final native void sendSignalQuiet(int pid, int signal); 1110 1111 /** @hide */ 1112 public static final native long getFreeMemory(); 1113 1114 /** @hide */ 1115 public static final native long getTotalMemory(); 1116 1117 /** @hide */ 1118 public static final native void readProcLines(String path, 1119 String[] reqFields, long[] outSizes); 1120 1121 /** @hide */ 1122 public static final native int[] getPids(String path, int[] lastArray); 1123 1124 /** @hide */ 1125 public static final int PROC_TERM_MASK = 0xff; 1126 /** @hide */ 1127 public static final int PROC_ZERO_TERM = 0; 1128 /** @hide */ 1129 public static final int PROC_SPACE_TERM = (int)' '; 1130 /** @hide */ 1131 public static final int PROC_TAB_TERM = (int)'\t'; 1132 /** @hide */ 1133 public static final int PROC_COMBINE = 0x100; 1134 /** @hide */ 1135 public static final int PROC_PARENS = 0x200; 1136 /** @hide */ 1137 public static final int PROC_QUOTES = 0x400; 1138 /** @hide */ 1139 public static final int PROC_OUT_STRING = 0x1000; 1140 /** @hide */ 1141 public static final int PROC_OUT_LONG = 0x2000; 1142 /** @hide */ 1143 public static final int PROC_OUT_FLOAT = 0x4000; 1144 1145 /** @hide */ 1146 public static final native boolean readProcFile(String file, int[] format, 1147 String[] outStrings, long[] outLongs, float[] outFloats); 1148 1149 /** @hide */ 1150 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 1151 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 1152 1153 /** @hide */ 1154 public static final native int[] getPidsForCommands(String[] cmds); 1155 1156 /** 1157 * Gets the total Pss value for a given process, in bytes. 1158 * 1159 * @param pid the process to the Pss for 1160 * @return the total Pss value for the given process in bytes, 1161 * or -1 if the value cannot be determined 1162 * @hide 1163 */ 1164 public static final native long getPss(int pid); 1165 1166 /** 1167 * Specifies the outcome of having started a process. 1168 * @hide 1169 */ 1170 public static final class ProcessStartResult { 1171 /** 1172 * The PID of the newly started process. 1173 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1174 */ 1175 public int pid; 1176 1177 /** 1178 * True if the process was started with a wrapper attached. 1179 */ 1180 public boolean usingWrapper; 1181 } 1182 1183 /** 1184 * Kill all processes in a process group started for the given 1185 * pid. 1186 * @hide 1187 */ 1188 public static final native int killProcessGroup(int uid, int pid); 1189 1190 /** 1191 * Remove all process groups. Expected to be called when ActivityManager 1192 * is restarted. 1193 * @hide 1194 */ 1195 public static final native void removeAllProcessGroups(); 1196} 1197