Process.java revision ed0ea40a41aae8e65bc189efe6b631ca78259383
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 start of a range of UIDs (and GIDs), going from this 154 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 155 * to applications. 156 */ 157 public static final int FIRST_APPLICATION_UID = 10000; 158 159 /** 160 * Last of application-specific UIDs starting at 161 * {@link #FIRST_APPLICATION_UID}. 162 */ 163 public static final int LAST_APPLICATION_UID = 19999; 164 165 /** 166 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 167 * @hide 168 */ 169 public static final int FIRST_ISOLATED_UID = 99000; 170 171 /** 172 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 173 * @hide 174 */ 175 public static final int LAST_ISOLATED_UID = 99999; 176 177 /** 178 * Defines the gid shared by all applications running under the same profile. 179 * @hide 180 */ 181 public static final int SHARED_USER_GID = 9997; 182 183 /** 184 * First gid for applications to share resources. Used when forward-locking 185 * is enabled but all UserHandles need to be able to read the resources. 186 * @hide 187 */ 188 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 189 190 /** 191 * Last gid for applications to share resources. Used when forward-locking 192 * is enabled but all UserHandles need to be able to read the resources. 193 * @hide 194 */ 195 public static final int LAST_SHARED_APPLICATION_GID = 59999; 196 197 /** 198 * Standard priority of application threads. 199 * Use with {@link #setThreadPriority(int)} and 200 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 201 * {@link java.lang.Thread} class. 202 */ 203 public static final int THREAD_PRIORITY_DEFAULT = 0; 204 205 /* 206 * *************************************** 207 * ** Keep in sync with utils/threads.h ** 208 * *************************************** 209 */ 210 211 /** 212 * Lowest available thread priority. Only for those who really, really 213 * don't want to run if anything else is happening. 214 * Use with {@link #setThreadPriority(int)} and 215 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 216 * {@link java.lang.Thread} class. 217 */ 218 public static final int THREAD_PRIORITY_LOWEST = 19; 219 220 /** 221 * Standard priority background threads. This gives your thread a slightly 222 * lower than normal priority, so that it will have less chance of impacting 223 * the responsiveness of the user interface. 224 * Use with {@link #setThreadPriority(int)} and 225 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 226 * {@link java.lang.Thread} class. 227 */ 228 public static final int THREAD_PRIORITY_BACKGROUND = 10; 229 230 /** 231 * Standard priority of threads that are currently running a user interface 232 * that the user is interacting with. Applications can not normally 233 * change to this priority; the system will automatically adjust your 234 * application threads as the user moves through the UI. 235 * Use with {@link #setThreadPriority(int)} and 236 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 237 * {@link java.lang.Thread} class. 238 */ 239 public static final int THREAD_PRIORITY_FOREGROUND = -2; 240 241 /** 242 * Standard priority of system display threads, involved in updating 243 * the user interface. Applications can not 244 * normally change to this priority. 245 * Use with {@link #setThreadPriority(int)} and 246 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 247 * {@link java.lang.Thread} class. 248 */ 249 public static final int THREAD_PRIORITY_DISPLAY = -4; 250 251 /** 252 * Standard priority of the most important display threads, for compositing 253 * the screen and retrieving input events. Applications can not normally 254 * change to this priority. 255 * Use with {@link #setThreadPriority(int)} and 256 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 257 * {@link java.lang.Thread} class. 258 */ 259 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 260 261 /** 262 * Standard priority of audio threads. Applications can not normally 263 * change to this priority. 264 * Use with {@link #setThreadPriority(int)} and 265 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 266 * {@link java.lang.Thread} class. 267 */ 268 public static final int THREAD_PRIORITY_AUDIO = -16; 269 270 /** 271 * Standard priority of the most important audio threads. 272 * Applications can not normally change to this priority. 273 * Use with {@link #setThreadPriority(int)} and 274 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 275 * {@link java.lang.Thread} class. 276 */ 277 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 278 279 /** 280 * Minimum increment to make a priority more favorable. 281 */ 282 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 283 284 /** 285 * Minimum increment to make a priority less favorable. 286 */ 287 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 288 289 /** 290 * Default scheduling policy 291 * @hide 292 */ 293 public static final int SCHED_OTHER = 0; 294 295 /** 296 * First-In First-Out scheduling policy 297 * @hide 298 */ 299 public static final int SCHED_FIFO = 1; 300 301 /** 302 * Round-Robin scheduling policy 303 * @hide 304 */ 305 public static final int SCHED_RR = 2; 306 307 /** 308 * Batch scheduling policy 309 * @hide 310 */ 311 public static final int SCHED_BATCH = 3; 312 313 /** 314 * Idle scheduling policy 315 * @hide 316 */ 317 public static final int SCHED_IDLE = 5; 318 319 // Keep in sync with SP_* constants of enum type SchedPolicy 320 // declared in system/core/include/cutils/sched_policy.h, 321 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 322 323 /** 324 * Default thread group - 325 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 326 * When used with setProcessGroup(), the group of each thread in the process 327 * is conditionally changed based on that thread's current priority, as follows: 328 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 329 * are moved to foreground thread group. All other threads are left unchanged. 330 * @hide 331 */ 332 public static final int THREAD_GROUP_DEFAULT = -1; 333 334 /** 335 * Background thread group - All threads in 336 * this group are scheduled with a reduced share of the CPU. 337 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 338 * FIXME rename to THREAD_GROUP_BACKGROUND. 339 * @hide 340 */ 341 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 342 343 /** 344 * Foreground thread group - All threads in 345 * this group are scheduled with a normal share of the CPU. 346 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 347 * Not used at this level. 348 * @hide 349 **/ 350 private static final int THREAD_GROUP_FOREGROUND = 1; 351 352 /** 353 * System thread group. 354 * @hide 355 **/ 356 public static final int THREAD_GROUP_SYSTEM = 2; 357 358 /** 359 * Application audio thread group. 360 * @hide 361 **/ 362 public static final int THREAD_GROUP_AUDIO_APP = 3; 363 364 /** 365 * System audio thread group. 366 * @hide 367 **/ 368 public static final int THREAD_GROUP_AUDIO_SYS = 4; 369 370 public static final int SIGNAL_QUIT = 3; 371 public static final int SIGNAL_KILL = 9; 372 public static final int SIGNAL_USR1 = 10; 373 374 /** 375 * State for communicating with the zygote process. 376 * 377 * @hide for internal use only. 378 */ 379 public static class ZygoteState { 380 final LocalSocket socket; 381 final DataInputStream inputStream; 382 final BufferedWriter writer; 383 final List<String> abiList; 384 385 boolean mClosed; 386 387 private ZygoteState(LocalSocket socket, DataInputStream inputStream, 388 BufferedWriter writer, List<String> abiList) { 389 this.socket = socket; 390 this.inputStream = inputStream; 391 this.writer = writer; 392 this.abiList = abiList; 393 } 394 395 public static ZygoteState connect(String socketAddress) throws IOException { 396 DataInputStream zygoteInputStream = null; 397 BufferedWriter zygoteWriter = null; 398 final LocalSocket zygoteSocket = new LocalSocket(); 399 400 try { 401 zygoteSocket.connect(new LocalSocketAddress(socketAddress, 402 LocalSocketAddress.Namespace.RESERVED)); 403 404 zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); 405 406 zygoteWriter = new BufferedWriter(new OutputStreamWriter( 407 zygoteSocket.getOutputStream()), 256); 408 } catch (IOException ex) { 409 try { 410 zygoteSocket.close(); 411 } catch (IOException ignore) { 412 } 413 414 throw ex; 415 } 416 417 String abiListString = getAbiList(zygoteWriter, zygoteInputStream); 418 Log.i("Zygote", "Process: zygote socket opened, supported ABIS: " + abiListString); 419 420 return new ZygoteState(zygoteSocket, zygoteInputStream, zygoteWriter, 421 Arrays.asList(abiListString.split(","))); 422 } 423 424 boolean matches(String abi) { 425 return abiList.contains(abi); 426 } 427 428 public void close() { 429 try { 430 socket.close(); 431 } catch (IOException ex) { 432 Log.e(LOG_TAG,"I/O exception on routine close", ex); 433 } 434 435 mClosed = true; 436 } 437 438 boolean isClosed() { 439 return mClosed; 440 } 441 } 442 443 /** 444 * The state of the connection to the primary zygote. 445 */ 446 static ZygoteState primaryZygoteState; 447 448 /** 449 * The state of the connection to the secondary zygote. 450 */ 451 static ZygoteState secondaryZygoteState; 452 453 /** 454 * Start a new process. 455 * 456 * <p>If processes are enabled, a new process is created and the 457 * static main() function of a <var>processClass</var> is executed there. 458 * The process will continue running after this function returns. 459 * 460 * <p>If processes are not enabled, a new thread in the caller's 461 * process is created and main() of <var>processClass</var> called there. 462 * 463 * <p>The niceName parameter, if not an empty string, is a custom name to 464 * give to the process instead of using processClass. This allows you to 465 * make easily identifyable processes even if you are using the same base 466 * <var>processClass</var> to start them. 467 * 468 * @param processClass The class to use as the process's main entry 469 * point. 470 * @param niceName A more readable name to use for the process. 471 * @param uid The user-id under which the process will run. 472 * @param gid The group-id under which the process will run. 473 * @param gids Additional group-ids associated with the process. 474 * @param debugFlags Additional flags. 475 * @param targetSdkVersion The target SDK version for the app. 476 * @param seInfo null-ok SELinux information for the new process. 477 * @param abi non-null the ABI this app should be started with. 478 * @param instructionSet null-ok the instruction set to use. 479 * @param appDataDir null-ok the data directory of the app. 480 * @param zygoteArgs Additional arguments to supply to the zygote process. 481 * 482 * @return An object that describes the result of the attempt to start the process. 483 * @throws RuntimeException on fatal start failure 484 * 485 * {@hide} 486 */ 487 public static final ProcessStartResult start(final String processClass, 488 final String niceName, 489 int uid, int gid, int[] gids, 490 int debugFlags, int mountExternal, 491 int targetSdkVersion, 492 String seInfo, 493 String abi, 494 String instructionSet, 495 String appDataDir, 496 String[] zygoteArgs) { 497 try { 498 return startViaZygote(processClass, niceName, uid, gid, gids, 499 debugFlags, mountExternal, targetSdkVersion, seInfo, 500 abi, instructionSet, appDataDir, zygoteArgs); 501 } catch (ZygoteStartFailedEx ex) { 502 Log.e(LOG_TAG, 503 "Starting VM process through Zygote failed"); 504 throw new RuntimeException( 505 "Starting VM process through Zygote failed", ex); 506 } 507 } 508 509 /** retry interval for opening a zygote socket */ 510 static final int ZYGOTE_RETRY_MILLIS = 500; 511 512 /** 513 * Queries the zygote for the list of ABIS it supports. 514 * 515 * @throws ZygoteStartFailedEx if the query failed. 516 */ 517 private static String getAbiList(BufferedWriter writer, DataInputStream inputStream) 518 throws IOException { 519 // Each query starts with the argument count (1 in this case) 520 writer.write("1"); 521 // ... followed by a new-line. 522 writer.newLine(); 523 // ... followed by our only argument. 524 writer.write("--query-abi-list"); 525 writer.newLine(); 526 writer.flush(); 527 528 // The response is a length prefixed stream of ASCII bytes. 529 int numBytes = inputStream.readInt(); 530 byte[] bytes = new byte[numBytes]; 531 inputStream.readFully(bytes); 532 533 return new String(bytes, StandardCharsets.US_ASCII); 534 } 535 536 /** 537 * Sends an argument list to the zygote process, which starts a new child 538 * and returns the child's pid. Please note: the present implementation 539 * replaces newlines in the argument list with spaces. 540 * 541 * @throws ZygoteStartFailedEx if process start failed for any reason 542 */ 543 private static ProcessStartResult zygoteSendArgsAndGetResult( 544 ZygoteState zygoteState, ArrayList<String> args) 545 throws ZygoteStartFailedEx { 546 try { 547 /** 548 * See com.android.internal.os.ZygoteInit.readArgumentList() 549 * Presently the wire format to the zygote process is: 550 * a) a count of arguments (argc, in essence) 551 * b) a number of newline-separated argument strings equal to count 552 * 553 * After the zygote process reads these it will write the pid of 554 * the child or -1 on failure, followed by boolean to 555 * indicate whether a wrapper process was used. 556 */ 557 final BufferedWriter writer = zygoteState.writer; 558 final DataInputStream inputStream = zygoteState.inputStream; 559 560 writer.write(Integer.toString(args.size())); 561 writer.newLine(); 562 563 int sz = args.size(); 564 for (int i = 0; i < sz; i++) { 565 String arg = args.get(i); 566 if (arg.indexOf('\n') >= 0) { 567 throw new ZygoteStartFailedEx( 568 "embedded newlines not allowed"); 569 } 570 writer.write(arg); 571 writer.newLine(); 572 } 573 574 writer.flush(); 575 576 // Should there be a timeout on this? 577 ProcessStartResult result = new ProcessStartResult(); 578 result.pid = inputStream.readInt(); 579 if (result.pid < 0) { 580 throw new ZygoteStartFailedEx("fork() failed"); 581 } 582 result.usingWrapper = inputStream.readBoolean(); 583 return result; 584 } catch (IOException ex) { 585 zygoteState.close(); 586 throw new ZygoteStartFailedEx(ex); 587 } 588 } 589 590 /** 591 * Starts a new process via the zygote mechanism. 592 * 593 * @param processClass Class name whose static main() to run 594 * @param niceName 'nice' process name to appear in ps 595 * @param uid a POSIX uid that the new process should setuid() to 596 * @param gid a POSIX gid that the new process shuold setgid() to 597 * @param gids null-ok; a list of supplementary group IDs that the 598 * new process should setgroup() to. 599 * @param debugFlags Additional flags. 600 * @param targetSdkVersion The target SDK version for the app. 601 * @param seInfo null-ok SELinux information for the new process. 602 * @param abi the ABI the process should use. 603 * @param instructionSet null-ok the instruction set to use. 604 * @param appDataDir null-ok the data directory of the app. 605 * @param extraArgs Additional arguments to supply to the zygote process. 606 * @return An object that describes the result of the attempt to start the process. 607 * @throws ZygoteStartFailedEx if process start failed for any reason 608 */ 609 private static ProcessStartResult startViaZygote(final String processClass, 610 final String niceName, 611 final int uid, final int gid, 612 final int[] gids, 613 int debugFlags, int mountExternal, 614 int targetSdkVersion, 615 String seInfo, 616 String abi, 617 String instructionSet, 618 String appDataDir, 619 String[] extraArgs) 620 throws ZygoteStartFailedEx { 621 synchronized(Process.class) { 622 ArrayList<String> argsForZygote = new ArrayList<String>(); 623 624 // --runtime-args, --setuid=, --setgid=, 625 // and --setgroups= must go first 626 argsForZygote.add("--runtime-args"); 627 argsForZygote.add("--setuid=" + uid); 628 argsForZygote.add("--setgid=" + gid); 629 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 630 argsForZygote.add("--enable-jni-logging"); 631 } 632 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 633 argsForZygote.add("--enable-safemode"); 634 } 635 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 636 argsForZygote.add("--enable-debugger"); 637 } 638 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 639 argsForZygote.add("--enable-checkjni"); 640 } 641 if ((debugFlags & Zygote.DEBUG_GENERATE_DEBUG_INFO) != 0) { 642 argsForZygote.add("--generate-debug-info"); 643 } 644 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 645 argsForZygote.add("--enable-assert"); 646 } 647 if (mountExternal == Zygote.MOUNT_EXTERNAL_DEFAULT) { 648 argsForZygote.add("--mount-external-default"); 649 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_READ) { 650 argsForZygote.add("--mount-external-read"); 651 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_WRITE) { 652 argsForZygote.add("--mount-external-write"); 653 } 654 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 655 656 //TODO optionally enable debuger 657 //argsForZygote.add("--enable-debugger"); 658 659 // --setgroups is a comma-separated list 660 if (gids != null && gids.length > 0) { 661 StringBuilder sb = new StringBuilder(); 662 sb.append("--setgroups="); 663 664 int sz = gids.length; 665 for (int i = 0; i < sz; i++) { 666 if (i != 0) { 667 sb.append(','); 668 } 669 sb.append(gids[i]); 670 } 671 672 argsForZygote.add(sb.toString()); 673 } 674 675 if (niceName != null) { 676 argsForZygote.add("--nice-name=" + niceName); 677 } 678 679 if (seInfo != null) { 680 argsForZygote.add("--seinfo=" + seInfo); 681 } 682 683 if (instructionSet != null) { 684 argsForZygote.add("--instruction-set=" + instructionSet); 685 } 686 687 if (appDataDir != null) { 688 argsForZygote.add("--app-data-dir=" + appDataDir); 689 } 690 691 argsForZygote.add(processClass); 692 693 if (extraArgs != null) { 694 for (String arg : extraArgs) { 695 argsForZygote.add(arg); 696 } 697 } 698 699 return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); 700 } 701 } 702 703 /** 704 * Tries to establish a connection to the zygote that handles a given {@code abi}. Might block and retry if the 705 * zygote is unresponsive. This method is a no-op if a connection is already open. 706 * 707 * @hide 708 */ 709 public static void establishZygoteConnectionForAbi(String abi) { 710 try { 711 openZygoteSocketIfNeeded(abi); 712 } catch (ZygoteStartFailedEx ex) { 713 throw new RuntimeException("Unable to connect to zygote for abi: " + abi, ex); 714 } 715 } 716 717 /** 718 * Tries to open socket to Zygote process if not already open. If 719 * already open, does nothing. May block and retry. 720 */ 721 private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx { 722 if (primaryZygoteState == null || primaryZygoteState.isClosed()) { 723 try { 724 primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET); 725 } catch (IOException ioe) { 726 throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe); 727 } 728 } 729 730 if (primaryZygoteState.matches(abi)) { 731 return primaryZygoteState; 732 } 733 734 // The primary zygote didn't match. Try the secondary. 735 if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { 736 try { 737 secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET); 738 } catch (IOException ioe) { 739 throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe); 740 } 741 } 742 743 if (secondaryZygoteState.matches(abi)) { 744 return secondaryZygoteState; 745 } 746 747 throw new ZygoteStartFailedEx("Unsupported zygote ABI: " + abi); 748 } 749 750 /** 751 * Returns elapsed milliseconds of the time this process has run. 752 * @return Returns the number of milliseconds this process has return. 753 */ 754 public static final native long getElapsedCpuTime(); 755 756 /** 757 * Returns true if the current process is a 64-bit runtime. 758 */ 759 public static final boolean is64Bit() { 760 return VMRuntime.getRuntime().is64Bit(); 761 } 762 763 /** 764 * Returns the identifier of this process, which can be used with 765 * {@link #killProcess} and {@link #sendSignal}. 766 */ 767 public static final int myPid() { 768 return Os.getpid(); 769 } 770 771 /** 772 * Returns the identifier of this process' parent. 773 * @hide 774 */ 775 public static final int myPpid() { 776 return Os.getppid(); 777 } 778 779 /** 780 * Returns the identifier of the calling thread, which be used with 781 * {@link #setThreadPriority(int, int)}. 782 */ 783 public static final int myTid() { 784 return Os.gettid(); 785 } 786 787 /** 788 * Returns the identifier of this process's uid. This is the kernel uid 789 * that the process is running under, which is the identity of its 790 * app-specific sandbox. It is different from {@link #myUserHandle} in that 791 * a uid identifies a specific app sandbox in a specific user. 792 */ 793 public static final int myUid() { 794 return Os.getuid(); 795 } 796 797 /** 798 * Returns this process's user handle. This is the 799 * user the process is running under. It is distinct from 800 * {@link #myUid()} in that a particular user will have multiple 801 * distinct apps running under it each with their own uid. 802 */ 803 public static UserHandle myUserHandle() { 804 return UserHandle.of(UserHandle.getUserId(myUid())); 805 } 806 807 /** 808 * Returns whether the current process is in an isolated sandbox. 809 * @hide 810 */ 811 public static final boolean isIsolated() { 812 return isIsolated(myUid()); 813 } 814 815 /** {@hide} */ 816 public static final boolean isIsolated(int uid) { 817 uid = UserHandle.getAppId(uid); 818 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 819 } 820 821 /** 822 * Returns the UID assigned to a particular user name, or -1 if there is 823 * none. If the given string consists of only numbers, it is converted 824 * directly to a uid. 825 */ 826 public static final native int getUidForName(String name); 827 828 /** 829 * Returns the GID assigned to a particular user name, or -1 if there is 830 * none. If the given string consists of only numbers, it is converted 831 * directly to a gid. 832 */ 833 public static final native int getGidForName(String name); 834 835 /** 836 * Returns a uid for a currently running process. 837 * @param pid the process id 838 * @return the uid of the process, or -1 if the process is not running. 839 * @hide pending API council review 840 */ 841 public static final int getUidForPid(int pid) { 842 String[] procStatusLabels = { "Uid:" }; 843 long[] procStatusValues = new long[1]; 844 procStatusValues[0] = -1; 845 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 846 return (int) procStatusValues[0]; 847 } 848 849 /** 850 * Returns the parent process id for a currently running process. 851 * @param pid the process id 852 * @return the parent process id of the process, or -1 if the process is not running. 853 * @hide 854 */ 855 public static final int getParentPid(int pid) { 856 String[] procStatusLabels = { "PPid:" }; 857 long[] procStatusValues = new long[1]; 858 procStatusValues[0] = -1; 859 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 860 return (int) procStatusValues[0]; 861 } 862 863 /** 864 * Returns the thread group leader id for a currently running thread. 865 * @param tid the thread id 866 * @return the thread group leader id of the thread, or -1 if the thread is not running. 867 * This is same as what getpid(2) would return if called by tid. 868 * @hide 869 */ 870 public static final int getThreadGroupLeader(int tid) { 871 String[] procStatusLabels = { "Tgid:" }; 872 long[] procStatusValues = new long[1]; 873 procStatusValues[0] = -1; 874 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 875 return (int) procStatusValues[0]; 876 } 877 878 /** 879 * Set the priority of a thread, based on Linux priorities. 880 * 881 * @param tid The identifier of the thread/process to change. 882 * @param priority A Linux priority level, from -20 for highest scheduling 883 * priority to 19 for lowest scheduling priority. 884 * 885 * @throws IllegalArgumentException Throws IllegalArgumentException if 886 * <var>tid</var> does not exist. 887 * @throws SecurityException Throws SecurityException if your process does 888 * not have permission to modify the given thread, or to use the given 889 * priority. 890 */ 891 public static final native void setThreadPriority(int tid, int priority) 892 throws IllegalArgumentException, SecurityException; 893 894 /** 895 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 896 * throw an exception if passed a background-level thread priority. This is only 897 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 898 * 899 * @hide 900 */ 901 public static final native void setCanSelfBackground(boolean backgroundOk); 902 903 /** 904 * Sets the scheduling group for a thread. 905 * @hide 906 * @param tid The identifier of the thread to change. 907 * @param group The target group for this thread from THREAD_GROUP_*. 908 * 909 * @throws IllegalArgumentException Throws IllegalArgumentException if 910 * <var>tid</var> does not exist. 911 * @throws SecurityException Throws SecurityException if your process does 912 * not have permission to modify the given thread, or to use the given 913 * priority. 914 * If the thread is a thread group leader, that is it's gettid() == getpid(), 915 * then the other threads in the same thread group are _not_ affected. 916 */ 917 public static final native void setThreadGroup(int tid, int group) 918 throws IllegalArgumentException, SecurityException; 919 920 /** 921 * Sets the scheduling group for a process and all child threads 922 * @hide 923 * @param pid The identifier of the process to change. 924 * @param group The target group for this process from THREAD_GROUP_*. 925 * 926 * @throws IllegalArgumentException Throws IllegalArgumentException if 927 * <var>tid</var> does not exist. 928 * @throws SecurityException Throws SecurityException if your process does 929 * not have permission to modify the given thread, or to use the given 930 * priority. 931 * 932 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 933 * threads to the foreground scheduling group, but to leave background 934 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 935 * threads, regardless of priority, to the background scheduling group. 936 * group == THREAD_GROUP_FOREGROUND is not allowed. 937 */ 938 public static final native void setProcessGroup(int pid, int group) 939 throws IllegalArgumentException, SecurityException; 940 941 /** 942 * Return the scheduling group of requested process. 943 * 944 * @hide 945 */ 946 public static final native int getProcessGroup(int pid) 947 throws IllegalArgumentException, SecurityException; 948 949 /** 950 * Set the priority of the calling thread, based on Linux priorities. See 951 * {@link #setThreadPriority(int, int)} for more information. 952 * 953 * @param priority A Linux priority level, from -20 for highest scheduling 954 * priority to 19 for lowest scheduling priority. 955 * 956 * @throws IllegalArgumentException Throws IllegalArgumentException if 957 * <var>tid</var> does not exist. 958 * @throws SecurityException Throws SecurityException if your process does 959 * not have permission to modify the given thread, or to use the given 960 * priority. 961 * 962 * @see #setThreadPriority(int, int) 963 */ 964 public static final native void setThreadPriority(int priority) 965 throws IllegalArgumentException, SecurityException; 966 967 /** 968 * Return the current priority of a thread, based on Linux priorities. 969 * 970 * @param tid The identifier of the thread/process to change. 971 * 972 * @return Returns the current priority, as a Linux priority level, 973 * from -20 for highest scheduling priority to 19 for lowest scheduling 974 * priority. 975 * 976 * @throws IllegalArgumentException Throws IllegalArgumentException if 977 * <var>tid</var> does not exist. 978 */ 979 public static final native int getThreadPriority(int tid) 980 throws IllegalArgumentException; 981 982 /** 983 * Set the scheduling policy and priority of a thread, based on Linux. 984 * 985 * @param tid The identifier of the thread/process to change. 986 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 987 * @param priority A Linux priority level in a range appropriate for the given policy. 988 * 989 * @throws IllegalArgumentException Throws IllegalArgumentException if 990 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 991 * @throws SecurityException Throws SecurityException if your process does 992 * not have permission to modify the given thread, or to use the given 993 * scheduling policy or priority. 994 * 995 * {@hide} 996 */ 997 public static final native void setThreadScheduler(int tid, int policy, int priority) 998 throws IllegalArgumentException; 999 1000 /** 1001 * Determine whether the current environment supports multiple processes. 1002 * 1003 * @return Returns true if the system can run in multiple processes, else 1004 * false if everything is running in a single process. 1005 * 1006 * @deprecated This method always returns true. Do not use. 1007 */ 1008 @Deprecated 1009 public static final boolean supportsProcesses() { 1010 return true; 1011 } 1012 1013 /** 1014 * Adjust the swappiness level for a process. 1015 * 1016 * @param pid The process identifier to set. 1017 * @param is_increased Whether swappiness should be increased or default. 1018 * 1019 * @return Returns true if the underlying system supports this 1020 * feature, else false. 1021 * 1022 * {@hide} 1023 */ 1024 public static final native boolean setSwappiness(int pid, boolean is_increased); 1025 1026 /** 1027 * Change this process's argv[0] parameter. This can be useful to show 1028 * more descriptive information in things like the 'ps' command. 1029 * 1030 * @param text The new name of this process. 1031 * 1032 * {@hide} 1033 */ 1034 public static final native void setArgV0(String text); 1035 1036 /** 1037 * Kill the process with the given PID. 1038 * Note that, though this API allows us to request to 1039 * kill any process based on its PID, the kernel will 1040 * still impose standard restrictions on which PIDs you 1041 * are actually able to kill. Typically this means only 1042 * the process running the caller's packages/application 1043 * and any additional processes created by that app; packages 1044 * sharing a common UID will also be able to kill each 1045 * other's processes. 1046 */ 1047 public static final void killProcess(int pid) { 1048 sendSignal(pid, SIGNAL_KILL); 1049 } 1050 1051 /** @hide */ 1052 public static final native int setUid(int uid); 1053 1054 /** @hide */ 1055 public static final native int setGid(int uid); 1056 1057 /** 1058 * Send a signal to the given process. 1059 * 1060 * @param pid The pid of the target process. 1061 * @param signal The signal to send. 1062 */ 1063 public static final native void sendSignal(int pid, int signal); 1064 1065 /** 1066 * @hide 1067 * Private impl for avoiding a log message... DO NOT USE without doing 1068 * your own log, or the Android Illuminati will find you some night and 1069 * beat you up. 1070 */ 1071 public static final void killProcessQuiet(int pid) { 1072 sendSignalQuiet(pid, SIGNAL_KILL); 1073 } 1074 1075 /** 1076 * @hide 1077 * Private impl for avoiding a log message... DO NOT USE without doing 1078 * your own log, or the Android Illuminati will find you some night and 1079 * beat you up. 1080 */ 1081 public static final native void sendSignalQuiet(int pid, int signal); 1082 1083 /** @hide */ 1084 public static final native long getFreeMemory(); 1085 1086 /** @hide */ 1087 public static final native long getTotalMemory(); 1088 1089 /** @hide */ 1090 public static final native void readProcLines(String path, 1091 String[] reqFields, long[] outSizes); 1092 1093 /** @hide */ 1094 public static final native int[] getPids(String path, int[] lastArray); 1095 1096 /** @hide */ 1097 public static final int PROC_TERM_MASK = 0xff; 1098 /** @hide */ 1099 public static final int PROC_ZERO_TERM = 0; 1100 /** @hide */ 1101 public static final int PROC_SPACE_TERM = (int)' '; 1102 /** @hide */ 1103 public static final int PROC_TAB_TERM = (int)'\t'; 1104 /** @hide */ 1105 public static final int PROC_COMBINE = 0x100; 1106 /** @hide */ 1107 public static final int PROC_PARENS = 0x200; 1108 /** @hide */ 1109 public static final int PROC_QUOTES = 0x400; 1110 /** @hide */ 1111 public static final int PROC_OUT_STRING = 0x1000; 1112 /** @hide */ 1113 public static final int PROC_OUT_LONG = 0x2000; 1114 /** @hide */ 1115 public static final int PROC_OUT_FLOAT = 0x4000; 1116 1117 /** @hide */ 1118 public static final native boolean readProcFile(String file, int[] format, 1119 String[] outStrings, long[] outLongs, float[] outFloats); 1120 1121 /** @hide */ 1122 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 1123 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 1124 1125 /** @hide */ 1126 public static final native int[] getPidsForCommands(String[] cmds); 1127 1128 /** 1129 * Gets the total Pss value for a given process, in bytes. 1130 * 1131 * @param pid the process to the Pss for 1132 * @return the total Pss value for the given process in bytes, 1133 * or -1 if the value cannot be determined 1134 * @hide 1135 */ 1136 public static final native long getPss(int pid); 1137 1138 /** 1139 * Specifies the outcome of having started a process. 1140 * @hide 1141 */ 1142 public static final class ProcessStartResult { 1143 /** 1144 * The PID of the newly started process. 1145 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1146 */ 1147 public int pid; 1148 1149 /** 1150 * True if the process was started with a wrapper attached. 1151 */ 1152 public boolean usingWrapper; 1153 } 1154 1155 /** 1156 * Kill all processes in a process group started for the given 1157 * pid. 1158 * @hide 1159 */ 1160 public static final native int killProcessGroup(int uid, int pid); 1161 1162 /** 1163 * Remove all process groups. Expected to be called when ActivityManager 1164 * is restarted. 1165 * @hide 1166 */ 1167 public static final native void removeAllProcessGroups(); 1168} 1169