1 /* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.os; 18 19 import android.net.LocalSocket; 20 import android.net.LocalSocketAddress; 21 import android.system.Os; 22 import android.util.Log; 23 import com.android.internal.os.Zygote; 24 import dalvik.system.VMRuntime; 25 import java.io.BufferedWriter; 26 import java.io.DataInputStream; 27 import java.io.IOException; 28 import java.io.OutputStreamWriter; 29 import java.nio.charset.StandardCharsets; 30 import java.util.ArrayList; 31 import java.util.Arrays; 32 import 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 */ 51 public class Process { 52 private static final String LOG_TAG = "Process"; 53 54 /** 55 * @hide for internal use only. 56 */ 57 public static final String ZYGOTE_SOCKET = "zygote"; 58 59 /** 60 * @hide for internal use only. 61 */ 62 public static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary"; 63 64 /** 65 * Defines the root UID. 66 * @hide 67 */ 68 public static final int ROOT_UID = 0; 69 70 /** 71 * Defines the UID/GID under which system code runs. 72 */ 73 public static final int SYSTEM_UID = 1000; 74 75 /** 76 * Defines the UID/GID under which the telephony code runs. 77 */ 78 public static final int PHONE_UID = 1001; 79 80 /** 81 * Defines the UID/GID for the user shell. 82 * @hide 83 */ 84 public static final int SHELL_UID = 2000; 85 86 /** 87 * Defines the UID/GID for the log group. 88 * @hide 89 */ 90 public static final int LOG_UID = 1007; 91 92 /** 93 * Defines the UID/GID for the WIFI supplicant process. 94 * @hide 95 */ 96 public static final int WIFI_UID = 1010; 97 98 /** 99 * Defines the UID/GID for the mediaserver process. 100 * @hide 101 */ 102 public static final int MEDIA_UID = 1013; 103 104 /** 105 * Defines the UID/GID for the DRM process. 106 * @hide 107 */ 108 public static final int DRM_UID = 1019; 109 110 /** 111 * Defines the UID/GID for the group that controls VPN services. 112 * @hide 113 */ 114 public static final int VPN_UID = 1016; 115 116 /** 117 * Defines the UID/GID for the NFC service process. 118 * @hide 119 */ 120 public static final int NFC_UID = 1027; 121 122 /** 123 * Defines the UID/GID for the Bluetooth service process. 124 * @hide 125 */ 126 public static final int BLUETOOTH_UID = 1002; 127 128 /** 129 * Defines the GID for the group that allows write access to the internal media storage. 130 * @hide 131 */ 132 public static final int MEDIA_RW_GID = 1023; 133 134 /** 135 * Access to installed package details 136 * @hide 137 */ 138 public static final int PACKAGE_INFO_GID = 1032; 139 140 /** 141 * Defines the UID/GID for the shared RELRO file updater process. 142 * @hide 143 */ 144 public static final int SHARED_RELRO_UID = 1037; 145 146 /** 147 * Defines the start of a range of UIDs (and GIDs), going from this 148 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 149 * to applications. 150 */ 151 public static final int FIRST_APPLICATION_UID = 10000; 152 153 /** 154 * Last of application-specific UIDs starting at 155 * {@link #FIRST_APPLICATION_UID}. 156 */ 157 public static final int LAST_APPLICATION_UID = 19999; 158 159 /** 160 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 161 * @hide 162 */ 163 public static final int FIRST_ISOLATED_UID = 99000; 164 165 /** 166 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 167 * @hide 168 */ 169 public static final int LAST_ISOLATED_UID = 99999; 170 171 /** 172 * Defines the gid shared by all applications running under the same profile. 173 * @hide 174 */ 175 public static final int SHARED_USER_GID = 9997; 176 177 /** 178 * First gid for applications to share resources. Used when forward-locking 179 * is enabled but all UserHandles need to be able to read the resources. 180 * @hide 181 */ 182 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 183 184 /** 185 * Last gid for applications to share resources. Used when forward-locking 186 * is enabled but all UserHandles need to be able to read the resources. 187 * @hide 188 */ 189 public static final int LAST_SHARED_APPLICATION_GID = 59999; 190 191 /** 192 * Standard priority of application threads. 193 * Use with {@link #setThreadPriority(int)} and 194 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 195 * {@link java.lang.Thread} class. 196 */ 197 public static final int THREAD_PRIORITY_DEFAULT = 0; 198 199 /* 200 * *************************************** 201 * ** Keep in sync with utils/threads.h ** 202 * *************************************** 203 */ 204 205 /** 206 * Lowest available thread priority. Only for those who really, really 207 * don't want to run if anything else is happening. 208 * Use with {@link #setThreadPriority(int)} and 209 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 210 * {@link java.lang.Thread} class. 211 */ 212 public static final int THREAD_PRIORITY_LOWEST = 19; 213 214 /** 215 * Standard priority background threads. This gives your thread a slightly 216 * lower than normal priority, so that it will have less chance of impacting 217 * the responsiveness of the user interface. 218 * Use with {@link #setThreadPriority(int)} and 219 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 220 * {@link java.lang.Thread} class. 221 */ 222 public static final int THREAD_PRIORITY_BACKGROUND = 10; 223 224 /** 225 * Standard priority of threads that are currently running a user interface 226 * that the user is interacting with. Applications can not normally 227 * change to this priority; the system will automatically adjust your 228 * application threads as the user moves through the UI. 229 * Use with {@link #setThreadPriority(int)} and 230 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 231 * {@link java.lang.Thread} class. 232 */ 233 public static final int THREAD_PRIORITY_FOREGROUND = -2; 234 235 /** 236 * Standard priority of system display threads, involved in updating 237 * the user interface. Applications can not 238 * normally change to this priority. 239 * Use with {@link #setThreadPriority(int)} and 240 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 241 * {@link java.lang.Thread} class. 242 */ 243 public static final int THREAD_PRIORITY_DISPLAY = -4; 244 245 /** 246 * Standard priority of the most important display threads, for compositing 247 * the screen and retrieving input events. Applications can not normally 248 * change to this priority. 249 * Use with {@link #setThreadPriority(int)} and 250 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 251 * {@link java.lang.Thread} class. 252 */ 253 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 254 255 /** 256 * Standard priority of audio threads. Applications can not normally 257 * change to this priority. 258 * Use with {@link #setThreadPriority(int)} and 259 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 260 * {@link java.lang.Thread} class. 261 */ 262 public static final int THREAD_PRIORITY_AUDIO = -16; 263 264 /** 265 * Standard priority of the most important audio threads. 266 * Applications can not normally change to this priority. 267 * Use with {@link #setThreadPriority(int)} and 268 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 269 * {@link java.lang.Thread} class. 270 */ 271 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 272 273 /** 274 * Minimum increment to make a priority more favorable. 275 */ 276 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 277 278 /** 279 * Minimum increment to make a priority less favorable. 280 */ 281 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 282 283 /** 284 * Default scheduling policy 285 * @hide 286 */ 287 public static final int SCHED_OTHER = 0; 288 289 /** 290 * First-In First-Out scheduling policy 291 * @hide 292 */ 293 public static final int SCHED_FIFO = 1; 294 295 /** 296 * Round-Robin scheduling policy 297 * @hide 298 */ 299 public static final int SCHED_RR = 2; 300 301 /** 302 * Batch scheduling policy 303 * @hide 304 */ 305 public static final int SCHED_BATCH = 3; 306 307 /** 308 * Idle scheduling policy 309 * @hide 310 */ 311 public static final int SCHED_IDLE = 5; 312 313 // Keep in sync with SP_* constants of enum type SchedPolicy 314 // declared in system/core/include/cutils/sched_policy.h, 315 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 316 317 /** 318 * Default thread group - 319 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 320 * When used with setProcessGroup(), the group of each thread in the process 321 * is conditionally changed based on that thread's current priority, as follows: 322 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 323 * are moved to foreground thread group. All other threads are left unchanged. 324 * @hide 325 */ 326 public static final int THREAD_GROUP_DEFAULT = -1; 327 328 /** 329 * Background thread group - All threads in 330 * this group are scheduled with a reduced share of the CPU. 331 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 332 * FIXME rename to THREAD_GROUP_BACKGROUND. 333 * @hide 334 */ 335 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 336 337 /** 338 * Foreground thread group - All threads in 339 * this group are scheduled with a normal share of the CPU. 340 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 341 * Not used at this level. 342 * @hide 343 **/ 344 private static final int THREAD_GROUP_FOREGROUND = 1; 345 346 /** 347 * System thread group. 348 * @hide 349 **/ 350 public static final int THREAD_GROUP_SYSTEM = 2; 351 352 /** 353 * Application audio thread group. 354 * @hide 355 **/ 356 public static final int THREAD_GROUP_AUDIO_APP = 3; 357 358 /** 359 * System audio thread group. 360 * @hide 361 **/ 362 public static final int THREAD_GROUP_AUDIO_SYS = 4; 363 364 public static final int SIGNAL_QUIT = 3; 365 public static final int SIGNAL_KILL = 9; 366 public static final int SIGNAL_USR1 = 10; 367 368 /** 369 * State for communicating with the zygote process. 370 * 371 * @hide for internal use only. 372 */ 373 public static class ZygoteState { 374 final LocalSocket socket; 375 final DataInputStream inputStream; 376 final BufferedWriter writer; 377 final List<String> abiList; 378 379 boolean mClosed; 380 381 private ZygoteState(LocalSocket socket, DataInputStream inputStream, 382 BufferedWriter writer, List<String> abiList) { 383 this.socket = socket; 384 this.inputStream = inputStream; 385 this.writer = writer; 386 this.abiList = abiList; 387 } 388 389 public static ZygoteState connect(String socketAddress) throws IOException { 390 DataInputStream zygoteInputStream = null; 391 BufferedWriter zygoteWriter = null; 392 final LocalSocket zygoteSocket = new LocalSocket(); 393 394 try { 395 zygoteSocket.connect(new LocalSocketAddress(socketAddress, 396 LocalSocketAddress.Namespace.RESERVED)); 397 398 zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); 399 400 zygoteWriter = new BufferedWriter(new OutputStreamWriter( 401 zygoteSocket.getOutputStream()), 256); 402 } catch (IOException ex) { 403 try { 404 zygoteSocket.close(); 405 } catch (IOException ignore) { 406 } 407 408 throw ex; 409 } 410 411 String abiListString = getAbiList(zygoteWriter, zygoteInputStream); 412 Log.i("Zygote", "Process: zygote socket opened, supported ABIS: " + abiListString); 413 414 return new ZygoteState(zygoteSocket, zygoteInputStream, zygoteWriter, 415 Arrays.asList(abiListString.split(","))); 416 } 417 418 boolean matches(String abi) { 419 return abiList.contains(abi); 420 } 421 422 public void close() { 423 try { 424 socket.close(); 425 } catch (IOException ex) { 426 Log.e(LOG_TAG,"I/O exception on routine close", ex); 427 } 428 429 mClosed = true; 430 } 431 432 boolean isClosed() { 433 return mClosed; 434 } 435 } 436 437 /** 438 * The state of the connection to the primary zygote. 439 */ 440 static ZygoteState primaryZygoteState; 441 442 /** 443 * The state of the connection to the secondary zygote. 444 */ 445 static ZygoteState secondaryZygoteState; 446 447 /** 448 * Start a new process. 449 * 450 * <p>If processes are enabled, a new process is created and the 451 * static main() function of a <var>processClass</var> is executed there. 452 * The process will continue running after this function returns. 453 * 454 * <p>If processes are not enabled, a new thread in the caller's 455 * process is created and main() of <var>processClass</var> called there. 456 * 457 * <p>The niceName parameter, if not an empty string, is a custom name to 458 * give to the process instead of using processClass. This allows you to 459 * make easily identifyable processes even if you are using the same base 460 * <var>processClass</var> to start them. 461 * 462 * @param processClass The class to use as the process's main entry 463 * point. 464 * @param niceName A more readable name to use for the process. 465 * @param uid The user-id under which the process will run. 466 * @param gid The group-id under which the process will run. 467 * @param gids Additional group-ids associated with the process. 468 * @param debugFlags Additional flags. 469 * @param targetSdkVersion The target SDK version for the app. 470 * @param seInfo null-ok SELinux information for the new process. 471 * @param abi non-null the ABI this app should be started with. 472 * @param instructionSet null-ok the instruction set to use. 473 * @param appDataDir null-ok the data directory of the app. 474 * @param zygoteArgs Additional arguments to supply to the zygote process. 475 * 476 * @return An object that describes the result of the attempt to start the process. 477 * @throws RuntimeException on fatal start failure 478 * 479 * {@hide} 480 */ 481 public static final ProcessStartResult start(final String processClass, 482 final String niceName, 483 int uid, int gid, int[] gids, 484 int debugFlags, int mountExternal, 485 int targetSdkVersion, 486 String seInfo, 487 String abi, 488 String instructionSet, 489 String appDataDir, 490 String[] zygoteArgs) { 491 try { 492 return startViaZygote(processClass, niceName, uid, gid, gids, 493 debugFlags, mountExternal, targetSdkVersion, seInfo, 494 abi, instructionSet, appDataDir, zygoteArgs); 495 } catch (ZygoteStartFailedEx ex) { 496 Log.e(LOG_TAG, 497 "Starting VM process through Zygote failed"); 498 throw new RuntimeException( 499 "Starting VM process through Zygote failed", ex); 500 } 501 } 502 503 /** retry interval for opening a zygote socket */ 504 static final int ZYGOTE_RETRY_MILLIS = 500; 505 506 /** 507 * Queries the zygote for the list of ABIS it supports. 508 * 509 * @throws ZygoteStartFailedEx if the query failed. 510 */ 511 private static String getAbiList(BufferedWriter writer, DataInputStream inputStream) 512 throws IOException { 513 // Each query starts with the argument count (1 in this case) 514 writer.write("1"); 515 // ... followed by a new-line. 516 writer.newLine(); 517 // ... followed by our only argument. 518 writer.write("--query-abi-list"); 519 writer.newLine(); 520 writer.flush(); 521 522 // The response is a length prefixed stream of ASCII bytes. 523 int numBytes = inputStream.readInt(); 524 byte[] bytes = new byte[numBytes]; 525 inputStream.readFully(bytes); 526 527 return new String(bytes, StandardCharsets.US_ASCII); 528 } 529 530 /** 531 * Sends an argument list to the zygote process, which starts a new child 532 * and returns the child's pid. Please note: the present implementation 533 * replaces newlines in the argument list with spaces. 534 * 535 * @throws ZygoteStartFailedEx if process start failed for any reason 536 */ 537 private static ProcessStartResult zygoteSendArgsAndGetResult( 538 ZygoteState zygoteState, ArrayList<String> args) 539 throws ZygoteStartFailedEx { 540 try { 541 /** 542 * See com.android.internal.os.ZygoteInit.readArgumentList() 543 * Presently the wire format to the zygote process is: 544 * a) a count of arguments (argc, in essence) 545 * b) a number of newline-separated argument strings equal to count 546 * 547 * After the zygote process reads these it will write the pid of 548 * the child or -1 on failure, followed by boolean to 549 * indicate whether a wrapper process was used. 550 */ 551 final BufferedWriter writer = zygoteState.writer; 552 final DataInputStream inputStream = zygoteState.inputStream; 553 554 writer.write(Integer.toString(args.size())); 555 writer.newLine(); 556 557 int sz = args.size(); 558 for (int i = 0; i < sz; i++) { 559 String arg = args.get(i); 560 if (arg.indexOf('\n') >= 0) { 561 throw new ZygoteStartFailedEx( 562 "embedded newlines not allowed"); 563 } 564 writer.write(arg); 565 writer.newLine(); 566 } 567 568 writer.flush(); 569 570 // Should there be a timeout on this? 571 ProcessStartResult result = new ProcessStartResult(); 572 result.pid = inputStream.readInt(); 573 if (result.pid < 0) { 574 throw new ZygoteStartFailedEx("fork() failed"); 575 } 576 result.usingWrapper = inputStream.readBoolean(); 577 return result; 578 } catch (IOException ex) { 579 zygoteState.close(); 580 throw new ZygoteStartFailedEx(ex); 581 } 582 } 583 584 /** 585 * Starts a new process via the zygote mechanism. 586 * 587 * @param processClass Class name whose static main() to run 588 * @param niceName 'nice' process name to appear in ps 589 * @param uid a POSIX uid that the new process should setuid() to 590 * @param gid a POSIX gid that the new process shuold setgid() to 591 * @param gids null-ok; a list of supplementary group IDs that the 592 * new process should setgroup() to. 593 * @param debugFlags Additional flags. 594 * @param targetSdkVersion The target SDK version for the app. 595 * @param seInfo null-ok SELinux information for the new process. 596 * @param abi the ABI the process should use. 597 * @param instructionSet null-ok the instruction set to use. 598 * @param appDataDir null-ok the data directory of the app. 599 * @param extraArgs Additional arguments to supply to the zygote process. 600 * @return An object that describes the result of the attempt to start the process. 601 * @throws ZygoteStartFailedEx if process start failed for any reason 602 */ 603 private static ProcessStartResult startViaZygote(final String processClass, 604 final String niceName, 605 final int uid, final int gid, 606 final int[] gids, 607 int debugFlags, int mountExternal, 608 int targetSdkVersion, 609 String seInfo, 610 String abi, 611 String instructionSet, 612 String appDataDir, 613 String[] extraArgs) 614 throws ZygoteStartFailedEx { 615 synchronized(Process.class) { 616 ArrayList<String> argsForZygote = new ArrayList<String>(); 617 618 // --runtime-args, --setuid=, --setgid=, 619 // and --setgroups= must go first 620 argsForZygote.add("--runtime-args"); 621 argsForZygote.add("--setuid=" + uid); 622 argsForZygote.add("--setgid=" + gid); 623 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 624 argsForZygote.add("--enable-jni-logging"); 625 } 626 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 627 argsForZygote.add("--enable-safemode"); 628 } 629 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 630 argsForZygote.add("--enable-debugger"); 631 } 632 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 633 argsForZygote.add("--enable-checkjni"); 634 } 635 if ((debugFlags & Zygote.DEBUG_ENABLE_JIT) != 0) { 636 argsForZygote.add("--enable-jit"); 637 } 638 if ((debugFlags & Zygote.DEBUG_GENERATE_DEBUG_INFO) != 0) { 639 argsForZygote.add("--generate-debug-info"); 640 } 641 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 642 argsForZygote.add("--enable-assert"); 643 } 644 if (mountExternal == Zygote.MOUNT_EXTERNAL_DEFAULT) { 645 argsForZygote.add("--mount-external-default"); 646 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_READ) { 647 argsForZygote.add("--mount-external-read"); 648 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_WRITE) { 649 argsForZygote.add("--mount-external-write"); 650 } 651 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 652 653 //TODO optionally enable debuger 654 //argsForZygote.add("--enable-debugger"); 655 656 // --setgroups is a comma-separated list 657 if (gids != null && gids.length > 0) { 658 StringBuilder sb = new StringBuilder(); 659 sb.append("--setgroups="); 660 661 int sz = gids.length; 662 for (int i = 0; i < sz; i++) { 663 if (i != 0) { 664 sb.append(','); 665 } 666 sb.append(gids[i]); 667 } 668 669 argsForZygote.add(sb.toString()); 670 } 671 672 if (niceName != null) { 673 argsForZygote.add("--nice-name=" + niceName); 674 } 675 676 if (seInfo != null) { 677 argsForZygote.add("--seinfo=" + seInfo); 678 } 679 680 if (instructionSet != null) { 681 argsForZygote.add("--instruction-set=" + instructionSet); 682 } 683 684 if (appDataDir != null) { 685 argsForZygote.add("--app-data-dir=" + appDataDir); 686 } 687 688 argsForZygote.add(processClass); 689 690 if (extraArgs != null) { 691 for (String arg : extraArgs) { 692 argsForZygote.add(arg); 693 } 694 } 695 696 return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); 697 } 698 } 699 700 /** 701 * Tries to establish a connection to the zygote that handles a given {@code abi}. Might block and retry if the 702 * zygote is unresponsive. This method is a no-op if a connection is already open. 703 * 704 * @hide 705 */ 706 public static void establishZygoteConnectionForAbi(String abi) { 707 try { 708 openZygoteSocketIfNeeded(abi); 709 } catch (ZygoteStartFailedEx ex) { 710 throw new RuntimeException("Unable to connect to zygote for abi: " + abi, ex); 711 } 712 } 713 714 /** 715 * Tries to open socket to Zygote process if not already open. If 716 * already open, does nothing. May block and retry. 717 */ 718 private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx { 719 if (primaryZygoteState == null || primaryZygoteState.isClosed()) { 720 try { 721 primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET); 722 } catch (IOException ioe) { 723 throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe); 724 } 725 } 726 727 if (primaryZygoteState.matches(abi)) { 728 return primaryZygoteState; 729 } 730 731 // The primary zygote didn't match. Try the secondary. 732 if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { 733 try { 734 secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET); 735 } catch (IOException ioe) { 736 throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe); 737 } 738 } 739 740 if (secondaryZygoteState.matches(abi)) { 741 return secondaryZygoteState; 742 } 743 744 throw new ZygoteStartFailedEx("Unsupported zygote ABI: " + abi); 745 } 746 747 /** 748 * Returns elapsed milliseconds of the time this process has run. 749 * @return Returns the number of milliseconds this process has return. 750 */ 751 public static final native long getElapsedCpuTime(); 752 753 /** 754 * Returns true if the current process is a 64-bit runtime. 755 */ 756 public static final boolean is64Bit() { 757 return VMRuntime.getRuntime().is64Bit(); 758 } 759 760 /** 761 * Returns the identifier of this process, which can be used with 762 * {@link #killProcess} and {@link #sendSignal}. 763 */ 764 public static final int myPid() { 765 return Os.getpid(); 766 } 767 768 /** 769 * Returns the identifier of this process' parent. 770 * @hide 771 */ 772 public static final int myPpid() { 773 return Os.getppid(); 774 } 775 776 /** 777 * Returns the identifier of the calling thread, which be used with 778 * {@link #setThreadPriority(int, int)}. 779 */ 780 public static final int myTid() { 781 return Os.gettid(); 782 } 783 784 /** 785 * Returns the identifier of this process's uid. This is the kernel uid 786 * that the process is running under, which is the identity of its 787 * app-specific sandbox. It is different from {@link #myUserHandle} in that 788 * a uid identifies a specific app sandbox in a specific user. 789 */ 790 public static final int myUid() { 791 return Os.getuid(); 792 } 793 794 /** 795 * Returns this process's user handle. This is the 796 * user the process is running under. It is distinct from 797 * {@link #myUid()} in that a particular user will have multiple 798 * distinct apps running under it each with their own uid. 799 */ 800 public static final UserHandle myUserHandle() { 801 return new UserHandle(UserHandle.getUserId(myUid())); 802 } 803 804 /** 805 * Returns whether the current process is in an isolated sandbox. 806 * @hide 807 */ 808 public static final boolean isIsolated() { 809 return isIsolated(myUid()); 810 } 811 812 /** {@hide} */ 813 public static final boolean isIsolated(int uid) { 814 uid = UserHandle.getAppId(uid); 815 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 816 } 817 818 /** 819 * Returns the UID assigned to a particular user name, or -1 if there is 820 * none. If the given string consists of only numbers, it is converted 821 * directly to a uid. 822 */ 823 public static final native int getUidForName(String name); 824 825 /** 826 * Returns the GID assigned to a particular user name, or -1 if there is 827 * none. If the given string consists of only numbers, it is converted 828 * directly to a gid. 829 */ 830 public static final native int getGidForName(String name); 831 832 /** 833 * Returns a uid for a currently running process. 834 * @param pid the process id 835 * @return the uid of the process, or -1 if the process is not running. 836 * @hide pending API council review 837 */ 838 public static final int getUidForPid(int pid) { 839 String[] procStatusLabels = { "Uid:" }; 840 long[] procStatusValues = new long[1]; 841 procStatusValues[0] = -1; 842 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 843 return (int) procStatusValues[0]; 844 } 845 846 /** 847 * Returns the parent process id for a currently running process. 848 * @param pid the process id 849 * @return the parent process id of the process, or -1 if the process is not running. 850 * @hide 851 */ 852 public static final int getParentPid(int pid) { 853 String[] procStatusLabels = { "PPid:" }; 854 long[] procStatusValues = new long[1]; 855 procStatusValues[0] = -1; 856 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 857 return (int) procStatusValues[0]; 858 } 859 860 /** 861 * Returns the thread group leader id for a currently running thread. 862 * @param tid the thread id 863 * @return the thread group leader id of the thread, or -1 if the thread is not running. 864 * This is same as what getpid(2) would return if called by tid. 865 * @hide 866 */ 867 public static final int getThreadGroupLeader(int tid) { 868 String[] procStatusLabels = { "Tgid:" }; 869 long[] procStatusValues = new long[1]; 870 procStatusValues[0] = -1; 871 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 872 return (int) procStatusValues[0]; 873 } 874 875 /** 876 * Set the priority of a thread, based on Linux priorities. 877 * 878 * @param tid The identifier of the thread/process to change. 879 * @param priority A Linux priority level, from -20 for highest scheduling 880 * priority to 19 for lowest scheduling priority. 881 * 882 * @throws IllegalArgumentException Throws IllegalArgumentException if 883 * <var>tid</var> does not exist. 884 * @throws SecurityException Throws SecurityException if your process does 885 * not have permission to modify the given thread, or to use the given 886 * priority. 887 */ 888 public static final native void setThreadPriority(int tid, int priority) 889 throws IllegalArgumentException, SecurityException; 890 891 /** 892 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 893 * throw an exception if passed a background-level thread priority. This is only 894 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 895 * 896 * @hide 897 */ 898 public static final native void setCanSelfBackground(boolean backgroundOk); 899 900 /** 901 * Sets the scheduling group for a thread. 902 * @hide 903 * @param tid The identifier of the thread to change. 904 * @param group The target group for this thread from THREAD_GROUP_*. 905 * 906 * @throws IllegalArgumentException Throws IllegalArgumentException if 907 * <var>tid</var> does not exist. 908 * @throws SecurityException Throws SecurityException if your process does 909 * not have permission to modify the given thread, or to use the given 910 * priority. 911 * If the thread is a thread group leader, that is it's gettid() == getpid(), 912 * then the other threads in the same thread group are _not_ affected. 913 */ 914 public static final native void setThreadGroup(int tid, int group) 915 throws IllegalArgumentException, SecurityException; 916 917 /** 918 * Sets the scheduling group for a process and all child threads 919 * @hide 920 * @param pid The identifier of the process to change. 921 * @param group The target group for this process from THREAD_GROUP_*. 922 * 923 * @throws IllegalArgumentException Throws IllegalArgumentException if 924 * <var>tid</var> does not exist. 925 * @throws SecurityException Throws SecurityException if your process does 926 * not have permission to modify the given thread, or to use the given 927 * priority. 928 * 929 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 930 * threads to the foreground scheduling group, but to leave background 931 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 932 * threads, regardless of priority, to the background scheduling group. 933 * group == THREAD_GROUP_FOREGROUND is not allowed. 934 */ 935 public static final native void setProcessGroup(int pid, int group) 936 throws IllegalArgumentException, SecurityException; 937 938 /** 939 * Return the scheduling group of requested process. 940 * 941 * @hide 942 */ 943 public static final native int getProcessGroup(int pid) 944 throws IllegalArgumentException, SecurityException; 945 946 /** 947 * Set the priority of the calling thread, based on Linux priorities. See 948 * {@link #setThreadPriority(int, int)} for more information. 949 * 950 * @param priority A Linux priority level, from -20 for highest scheduling 951 * priority to 19 for lowest scheduling priority. 952 * 953 * @throws IllegalArgumentException Throws IllegalArgumentException if 954 * <var>tid</var> does not exist. 955 * @throws SecurityException Throws SecurityException if your process does 956 * not have permission to modify the given thread, or to use the given 957 * priority. 958 * 959 * @see #setThreadPriority(int, int) 960 */ 961 public static final native void setThreadPriority(int priority) 962 throws IllegalArgumentException, SecurityException; 963 964 /** 965 * Return the current priority of a thread, based on Linux priorities. 966 * 967 * @param tid The identifier of the thread/process to change. 968 * 969 * @return Returns the current priority, as a Linux priority level, 970 * from -20 for highest scheduling priority to 19 for lowest scheduling 971 * priority. 972 * 973 * @throws IllegalArgumentException Throws IllegalArgumentException if 974 * <var>tid</var> does not exist. 975 */ 976 public static final native int getThreadPriority(int tid) 977 throws IllegalArgumentException; 978 979 /** 980 * Set the scheduling policy and priority of a thread, based on Linux. 981 * 982 * @param tid The identifier of the thread/process to change. 983 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 984 * @param priority A Linux priority level in a range appropriate for the given policy. 985 * 986 * @throws IllegalArgumentException Throws IllegalArgumentException if 987 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 988 * @throws SecurityException Throws SecurityException if your process does 989 * not have permission to modify the given thread, or to use the given 990 * scheduling policy or priority. 991 * 992 * {@hide} 993 */ 994 public static final native void setThreadScheduler(int tid, int policy, int priority) 995 throws IllegalArgumentException; 996 997 /** 998 * Determine whether the current environment supports multiple processes. 999 * 1000 * @return Returns true if the system can run in multiple processes, else 1001 * false if everything is running in a single process. 1002 * 1003 * @deprecated This method always returns true. Do not use. 1004 */ 1005 @Deprecated 1006 public static final boolean supportsProcesses() { 1007 return true; 1008 } 1009 1010 /** 1011 * Adjust the swappiness level for a process. 1012 * 1013 * @param pid The process identifier to set. 1014 * @param is_increased Whether swappiness should be increased or default. 1015 * 1016 * @return Returns true if the underlying system supports this 1017 * feature, else false. 1018 * 1019 * {@hide} 1020 */ 1021 public static final native boolean setSwappiness(int pid, boolean is_increased); 1022 1023 /** 1024 * Change this process's argv[0] parameter. This can be useful to show 1025 * more descriptive information in things like the 'ps' command. 1026 * 1027 * @param text The new name of this process. 1028 * 1029 * {@hide} 1030 */ 1031 public static final native void setArgV0(String text); 1032 1033 /** 1034 * Kill the process with the given PID. 1035 * Note that, though this API allows us to request to 1036 * kill any process based on its PID, the kernel will 1037 * still impose standard restrictions on which PIDs you 1038 * are actually able to kill. Typically this means only 1039 * the process running the caller's packages/application 1040 * and any additional processes created by that app; packages 1041 * sharing a common UID will also be able to kill each 1042 * other's processes. 1043 */ 1044 public static final void killProcess(int pid) { 1045 sendSignal(pid, SIGNAL_KILL); 1046 } 1047 1048 /** @hide */ 1049 public static final native int setUid(int uid); 1050 1051 /** @hide */ 1052 public static final native int setGid(int uid); 1053 1054 /** 1055 * Send a signal to the given process. 1056 * 1057 * @param pid The pid of the target process. 1058 * @param signal The signal to send. 1059 */ 1060 public static final native void sendSignal(int pid, int signal); 1061 1062 /** 1063 * @hide 1064 * Private impl for avoiding a log message... DO NOT USE without doing 1065 * your own log, or the Android Illuminati will find you some night and 1066 * beat you up. 1067 */ 1068 public static final void killProcessQuiet(int pid) { 1069 sendSignalQuiet(pid, SIGNAL_KILL); 1070 } 1071 1072 /** 1073 * @hide 1074 * Private impl for avoiding a log message... DO NOT USE without doing 1075 * your own log, or the Android Illuminati will find you some night and 1076 * beat you up. 1077 */ 1078 public static final native void sendSignalQuiet(int pid, int signal); 1079 1080 /** @hide */ 1081 public static final native long getFreeMemory(); 1082 1083 /** @hide */ 1084 public static final native long getTotalMemory(); 1085 1086 /** @hide */ 1087 public static final native void readProcLines(String path, 1088 String[] reqFields, long[] outSizes); 1089 1090 /** @hide */ 1091 public static final native int[] getPids(String path, int[] lastArray); 1092 1093 /** @hide */ 1094 public static final int PROC_TERM_MASK = 0xff; 1095 /** @hide */ 1096 public static final int PROC_ZERO_TERM = 0; 1097 /** @hide */ 1098 public static final int PROC_SPACE_TERM = (int)' '; 1099 /** @hide */ 1100 public static final int PROC_TAB_TERM = (int)'\t'; 1101 /** @hide */ 1102 public static final int PROC_COMBINE = 0x100; 1103 /** @hide */ 1104 public static final int PROC_PARENS = 0x200; 1105 /** @hide */ 1106 public static final int PROC_QUOTES = 0x400; 1107 /** @hide */ 1108 public static final int PROC_OUT_STRING = 0x1000; 1109 /** @hide */ 1110 public static final int PROC_OUT_LONG = 0x2000; 1111 /** @hide */ 1112 public static final int PROC_OUT_FLOAT = 0x4000; 1113 1114 /** @hide */ 1115 public static final native boolean readProcFile(String file, int[] format, 1116 String[] outStrings, long[] outLongs, float[] outFloats); 1117 1118 /** @hide */ 1119 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 1120 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 1121 1122 /** @hide */ 1123 public static final native int[] getPidsForCommands(String[] cmds); 1124 1125 /** 1126 * Gets the total Pss value for a given process, in bytes. 1127 * 1128 * @param pid the process to the Pss for 1129 * @return the total Pss value for the given process in bytes, 1130 * or -1 if the value cannot be determined 1131 * @hide 1132 */ 1133 public static final native long getPss(int pid); 1134 1135 /** 1136 * Specifies the outcome of having started a process. 1137 * @hide 1138 */ 1139 public static final class ProcessStartResult { 1140 /** 1141 * The PID of the newly started process. 1142 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1143 */ 1144 public int pid; 1145 1146 /** 1147 * True if the process was started with a wrapper attached. 1148 */ 1149 public boolean usingWrapper; 1150 } 1151 1152 /** 1153 * Kill all processes in a process group started for the given 1154 * pid. 1155 * @hide 1156 */ 1157 public static final native int killProcessGroup(int uid, int pid); 1158 1159 /** 1160 * Remove all process groups. Expected to be called when ActivityManager 1161 * is restarted. 1162 * @hide 1163 */ 1164 public static final native void removeAllProcessGroups(); 1165 } 1166
