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.annotation.TestApi; 20 import android.net.LocalSocket; 21 import android.net.LocalSocketAddress; 22 import android.system.Os; 23 import android.system.OsConstants; 24 import android.util.Log; 25 import com.android.internal.os.Zygote; 26 import dalvik.system.VMRuntime; 27 import java.io.BufferedWriter; 28 import java.io.DataInputStream; 29 import java.io.IOException; 30 import java.io.OutputStreamWriter; 31 import java.nio.charset.StandardCharsets; 32 import java.util.ArrayList; 33 import java.util.Arrays; 34 import java.util.List; 35 36 /*package*/ class ZygoteStartFailedEx extends Exception { 37 ZygoteStartFailedEx(String s) { 38 super(s); 39 } 40 41 ZygoteStartFailedEx(Throwable cause) { 42 super(cause); 43 } 44 45 ZygoteStartFailedEx(String s, Throwable cause) { 46 super(s, cause); 47 } 48 } 49 50 /** 51 * Tools for managing OS processes. 52 */ 53 public class Process { 54 private static final String LOG_TAG = "Process"; 55 56 /** 57 * @hide for internal use only. 58 */ 59 public static final String ZYGOTE_SOCKET = "zygote"; 60 61 /** 62 * @hide for internal use only. 63 */ 64 public static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary"; 65 66 /** 67 * Defines the root UID. 68 * @hide 69 */ 70 public static final int ROOT_UID = 0; 71 72 /** 73 * Defines the UID/GID under which system code runs. 74 */ 75 public static final int SYSTEM_UID = 1000; 76 77 /** 78 * Defines the UID/GID under which the telephony code runs. 79 */ 80 public static final int PHONE_UID = 1001; 81 82 /** 83 * Defines the UID/GID for the user shell. 84 * @hide 85 */ 86 public static final int SHELL_UID = 2000; 87 88 /** 89 * Defines the UID/GID for the log group. 90 * @hide 91 */ 92 public static final int LOG_UID = 1007; 93 94 /** 95 * Defines the UID/GID for the WIFI supplicant process. 96 * @hide 97 */ 98 public static final int WIFI_UID = 1010; 99 100 /** 101 * Defines the UID/GID for the mediaserver process. 102 * @hide 103 */ 104 public static final int MEDIA_UID = 1013; 105 106 /** 107 * Defines the UID/GID for the DRM process. 108 * @hide 109 */ 110 public static final int DRM_UID = 1019; 111 112 /** 113 * Defines the UID/GID for the group that controls VPN services. 114 * @hide 115 */ 116 public static final int VPN_UID = 1016; 117 118 /** 119 * Defines the UID/GID for the NFC service process. 120 * @hide 121 */ 122 public static final int NFC_UID = 1027; 123 124 /** 125 * Defines the UID/GID for the Bluetooth service process. 126 * @hide 127 */ 128 public static final int BLUETOOTH_UID = 1002; 129 130 /** 131 * Defines the GID for the group that allows write access to the internal media storage. 132 * @hide 133 */ 134 public static final int MEDIA_RW_GID = 1023; 135 136 /** 137 * Access to installed package details 138 * @hide 139 */ 140 public static final int PACKAGE_INFO_GID = 1032; 141 142 /** 143 * Defines the UID/GID for the shared RELRO file updater process. 144 * @hide 145 */ 146 public static final int SHARED_RELRO_UID = 1037; 147 148 /** 149 * Defines the UID/GID for the audioserver process. 150 * @hide 151 */ 152 public static final int AUDIOSERVER_UID = 1041; 153 154 /** 155 * Defines the UID/GID for the cameraserver process 156 * @hide 157 */ 158 public static final int CAMERASERVER_UID = 1047; 159 160 /** 161 * Defines the start of a range of UIDs (and GIDs), going from this 162 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 163 * to applications. 164 */ 165 public static final int FIRST_APPLICATION_UID = 10000; 166 167 /** 168 * Last of application-specific UIDs starting at 169 * {@link #FIRST_APPLICATION_UID}. 170 */ 171 public static final int LAST_APPLICATION_UID = 19999; 172 173 /** 174 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 175 * @hide 176 */ 177 public static final int FIRST_ISOLATED_UID = 99000; 178 179 /** 180 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 181 * @hide 182 */ 183 public static final int LAST_ISOLATED_UID = 99999; 184 185 /** 186 * Defines the gid shared by all applications running under the same profile. 187 * @hide 188 */ 189 public static final int SHARED_USER_GID = 9997; 190 191 /** 192 * First gid for applications to share resources. Used when forward-locking 193 * is enabled but all UserHandles need to be able to read the resources. 194 * @hide 195 */ 196 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 197 198 /** 199 * Last gid for applications to share resources. Used when forward-locking 200 * is enabled but all UserHandles need to be able to read the resources. 201 * @hide 202 */ 203 public static final int LAST_SHARED_APPLICATION_GID = 59999; 204 205 /** 206 * Standard priority of application threads. 207 * Use with {@link #setThreadPriority(int)} and 208 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 209 * {@link java.lang.Thread} class. 210 */ 211 public static final int THREAD_PRIORITY_DEFAULT = 0; 212 213 /* 214 * *************************************** 215 * ** Keep in sync with utils/threads.h ** 216 * *************************************** 217 */ 218 219 /** 220 * Lowest available thread priority. Only for those who really, really 221 * don't want to run if anything else is happening. 222 * Use with {@link #setThreadPriority(int)} and 223 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 224 * {@link java.lang.Thread} class. 225 */ 226 public static final int THREAD_PRIORITY_LOWEST = 19; 227 228 /** 229 * Standard priority background threads. This gives your thread a slightly 230 * lower than normal priority, so that it will have less chance of impacting 231 * the responsiveness of the user interface. 232 * Use with {@link #setThreadPriority(int)} and 233 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 234 * {@link java.lang.Thread} class. 235 */ 236 public static final int THREAD_PRIORITY_BACKGROUND = 10; 237 238 /** 239 * Standard priority of threads that are currently running a user interface 240 * that the user is interacting with. Applications can not normally 241 * change to this priority; the system will automatically adjust your 242 * application threads as the user moves through the UI. 243 * Use with {@link #setThreadPriority(int)} and 244 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 245 * {@link java.lang.Thread} class. 246 */ 247 public static final int THREAD_PRIORITY_FOREGROUND = -2; 248 249 /** 250 * Standard priority of system display threads, involved in updating 251 * the user interface. Applications can not 252 * normally change to this priority. 253 * Use with {@link #setThreadPriority(int)} and 254 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 255 * {@link java.lang.Thread} class. 256 */ 257 public static final int THREAD_PRIORITY_DISPLAY = -4; 258 259 /** 260 * Standard priority of the most important display threads, for compositing 261 * the screen and retrieving input events. Applications can not normally 262 * change to this priority. 263 * Use with {@link #setThreadPriority(int)} and 264 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 265 * {@link java.lang.Thread} class. 266 */ 267 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 268 269 /** 270 * Standard priority of audio threads. Applications can not normally 271 * change to this priority. 272 * Use with {@link #setThreadPriority(int)} and 273 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 274 * {@link java.lang.Thread} class. 275 */ 276 public static final int THREAD_PRIORITY_AUDIO = -16; 277 278 /** 279 * Standard priority of the most important audio threads. 280 * Applications can not normally change to this priority. 281 * Use with {@link #setThreadPriority(int)} and 282 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 283 * {@link java.lang.Thread} class. 284 */ 285 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 286 287 /** 288 * Minimum increment to make a priority more favorable. 289 */ 290 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 291 292 /** 293 * Minimum increment to make a priority less favorable. 294 */ 295 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 296 297 /** 298 * Default scheduling policy 299 * @hide 300 */ 301 public static final int SCHED_OTHER = 0; 302 303 /** 304 * First-In First-Out scheduling policy 305 * @hide 306 */ 307 public static final int SCHED_FIFO = 1; 308 309 /** 310 * Round-Robin scheduling policy 311 * @hide 312 */ 313 public static final int SCHED_RR = 2; 314 315 /** 316 * Batch scheduling policy 317 * @hide 318 */ 319 public static final int SCHED_BATCH = 3; 320 321 /** 322 * Idle scheduling policy 323 * @hide 324 */ 325 public static final int SCHED_IDLE = 5; 326 327 /** 328 * Reset scheduler choice on fork. 329 * @hide 330 */ 331 public static final int SCHED_RESET_ON_FORK = 0x40000000; 332 333 // Keep in sync with SP_* constants of enum type SchedPolicy 334 // declared in system/core/include/cutils/sched_policy.h, 335 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 336 337 /** 338 * Default thread group - 339 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 340 * When used with setProcessGroup(), the group of each thread in the process 341 * is conditionally changed based on that thread's current priority, as follows: 342 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 343 * are moved to foreground thread group. All other threads are left unchanged. 344 * @hide 345 */ 346 public static final int THREAD_GROUP_DEFAULT = -1; 347 348 /** 349 * Background thread group - All threads in 350 * this group are scheduled with a reduced share of the CPU. 351 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 352 * FIXME rename to THREAD_GROUP_BACKGROUND. 353 * @hide 354 */ 355 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 356 357 /** 358 * Foreground thread group - All threads in 359 * this group are scheduled with a normal share of the CPU. 360 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 361 * Not used at this level. 362 * @hide 363 **/ 364 private static final int THREAD_GROUP_FOREGROUND = 1; 365 366 /** 367 * System thread group. 368 * @hide 369 **/ 370 public static final int THREAD_GROUP_SYSTEM = 2; 371 372 /** 373 * Application audio thread group. 374 * @hide 375 **/ 376 public static final int THREAD_GROUP_AUDIO_APP = 3; 377 378 /** 379 * System audio thread group. 380 * @hide 381 **/ 382 public static final int THREAD_GROUP_AUDIO_SYS = 4; 383 384 /** 385 * Thread group for top foreground app. 386 * @hide 387 **/ 388 public static final int THREAD_GROUP_TOP_APP = 5; 389 390 public static final int SIGNAL_QUIT = 3; 391 public static final int SIGNAL_KILL = 9; 392 public static final int SIGNAL_USR1 = 10; 393 394 private static long sStartElapsedRealtime; 395 private static long sStartUptimeMillis; 396 397 /** 398 * State for communicating with the zygote process. 399 * 400 * @hide for internal use only. 401 */ 402 public static class ZygoteState { 403 final LocalSocket socket; 404 final DataInputStream inputStream; 405 final BufferedWriter writer; 406 final List<String> abiList; 407 408 boolean mClosed; 409 410 private ZygoteState(LocalSocket socket, DataInputStream inputStream, 411 BufferedWriter writer, List<String> abiList) { 412 this.socket = socket; 413 this.inputStream = inputStream; 414 this.writer = writer; 415 this.abiList = abiList; 416 } 417 418 public static ZygoteState connect(String socketAddress) throws IOException { 419 DataInputStream zygoteInputStream = null; 420 BufferedWriter zygoteWriter = null; 421 final LocalSocket zygoteSocket = new LocalSocket(); 422 423 try { 424 zygoteSocket.connect(new LocalSocketAddress(socketAddress, 425 LocalSocketAddress.Namespace.RESERVED)); 426 427 zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); 428 429 zygoteWriter = new BufferedWriter(new OutputStreamWriter( 430 zygoteSocket.getOutputStream()), 256); 431 } catch (IOException ex) { 432 try { 433 zygoteSocket.close(); 434 } catch (IOException ignore) { 435 } 436 437 throw ex; 438 } 439 440 String abiListString = getAbiList(zygoteWriter, zygoteInputStream); 441 Log.i("Zygote", "Process: zygote socket opened, supported ABIS: " + abiListString); 442 443 return new ZygoteState(zygoteSocket, zygoteInputStream, zygoteWriter, 444 Arrays.asList(abiListString.split(","))); 445 } 446 447 boolean matches(String abi) { 448 return abiList.contains(abi); 449 } 450 451 public void close() { 452 try { 453 socket.close(); 454 } catch (IOException ex) { 455 Log.e(LOG_TAG,"I/O exception on routine close", ex); 456 } 457 458 mClosed = true; 459 } 460 461 boolean isClosed() { 462 return mClosed; 463 } 464 } 465 466 /** 467 * The state of the connection to the primary zygote. 468 */ 469 static ZygoteState primaryZygoteState; 470 471 /** 472 * The state of the connection to the secondary zygote. 473 */ 474 static ZygoteState secondaryZygoteState; 475 476 /** 477 * Start a new process. 478 * 479 * <p>If processes are enabled, a new process is created and the 480 * static main() function of a <var>processClass</var> is executed there. 481 * The process will continue running after this function returns. 482 * 483 * <p>If processes are not enabled, a new thread in the caller's 484 * process is created and main() of <var>processClass</var> called there. 485 * 486 * <p>The niceName parameter, if not an empty string, is a custom name to 487 * give to the process instead of using processClass. This allows you to 488 * make easily identifyable processes even if you are using the same base 489 * <var>processClass</var> to start them. 490 * 491 * @param processClass The class to use as the process's main entry 492 * point. 493 * @param niceName A more readable name to use for the process. 494 * @param uid The user-id under which the process will run. 495 * @param gid The group-id under which the process will run. 496 * @param gids Additional group-ids associated with the process. 497 * @param debugFlags Additional flags. 498 * @param targetSdkVersion The target SDK version for the app. 499 * @param seInfo null-ok SELinux information for the new process. 500 * @param abi non-null the ABI this app should be started with. 501 * @param instructionSet null-ok the instruction set to use. 502 * @param appDataDir null-ok the data directory of the app. 503 * @param zygoteArgs Additional arguments to supply to the zygote process. 504 * 505 * @return An object that describes the result of the attempt to start the process. 506 * @throws RuntimeException on fatal start failure 507 * 508 * {@hide} 509 */ 510 public static final ProcessStartResult start(final String processClass, 511 final String niceName, 512 int uid, int gid, int[] gids, 513 int debugFlags, int mountExternal, 514 int targetSdkVersion, 515 String seInfo, 516 String abi, 517 String instructionSet, 518 String appDataDir, 519 String[] zygoteArgs) { 520 try { 521 return startViaZygote(processClass, niceName, uid, gid, gids, 522 debugFlags, mountExternal, targetSdkVersion, seInfo, 523 abi, instructionSet, appDataDir, zygoteArgs); 524 } catch (ZygoteStartFailedEx ex) { 525 Log.e(LOG_TAG, 526 "Starting VM process through Zygote failed"); 527 throw new RuntimeException( 528 "Starting VM process through Zygote failed", ex); 529 } 530 } 531 532 /** retry interval for opening a zygote socket */ 533 static final int ZYGOTE_RETRY_MILLIS = 500; 534 535 /** 536 * Queries the zygote for the list of ABIS it supports. 537 * 538 * @throws ZygoteStartFailedEx if the query failed. 539 */ 540 private static String getAbiList(BufferedWriter writer, DataInputStream inputStream) 541 throws IOException { 542 // Each query starts with the argument count (1 in this case) 543 writer.write("1"); 544 // ... followed by a new-line. 545 writer.newLine(); 546 // ... followed by our only argument. 547 writer.write("--query-abi-list"); 548 writer.newLine(); 549 writer.flush(); 550 551 // The response is a length prefixed stream of ASCII bytes. 552 int numBytes = inputStream.readInt(); 553 byte[] bytes = new byte[numBytes]; 554 inputStream.readFully(bytes); 555 556 return new String(bytes, StandardCharsets.US_ASCII); 557 } 558 559 /** 560 * Sends an argument list to the zygote process, which starts a new child 561 * and returns the child's pid. Please note: the present implementation 562 * replaces newlines in the argument list with spaces. 563 * 564 * @throws ZygoteStartFailedEx if process start failed for any reason 565 */ 566 private static ProcessStartResult zygoteSendArgsAndGetResult( 567 ZygoteState zygoteState, ArrayList<String> args) 568 throws ZygoteStartFailedEx { 569 try { 570 // Throw early if any of the arguments are malformed. This means we can 571 // avoid writing a partial response to the zygote. 572 int sz = args.size(); 573 for (int i = 0; i < sz; i++) { 574 if (args.get(i).indexOf('\n') >= 0) { 575 throw new ZygoteStartFailedEx("embedded newlines not allowed"); 576 } 577 } 578 579 /** 580 * See com.android.internal.os.ZygoteInit.readArgumentList() 581 * Presently the wire format to the zygote process is: 582 * a) a count of arguments (argc, in essence) 583 * b) a number of newline-separated argument strings equal to count 584 * 585 * After the zygote process reads these it will write the pid of 586 * the child or -1 on failure, followed by boolean to 587 * indicate whether a wrapper process was used. 588 */ 589 final BufferedWriter writer = zygoteState.writer; 590 final DataInputStream inputStream = zygoteState.inputStream; 591 592 writer.write(Integer.toString(args.size())); 593 writer.newLine(); 594 595 for (int i = 0; i < sz; i++) { 596 String arg = args.get(i); 597 writer.write(arg); 598 writer.newLine(); 599 } 600 601 writer.flush(); 602 603 // Should there be a timeout on this? 604 ProcessStartResult result = new ProcessStartResult(); 605 606 // Always read the entire result from the input stream to avoid leaving 607 // bytes in the stream for future process starts to accidentally stumble 608 // upon. 609 result.pid = inputStream.readInt(); 610 result.usingWrapper = inputStream.readBoolean(); 611 612 if (result.pid < 0) { 613 throw new ZygoteStartFailedEx("fork() failed"); 614 } 615 return result; 616 } catch (IOException ex) { 617 zygoteState.close(); 618 throw new ZygoteStartFailedEx(ex); 619 } 620 } 621 622 /** 623 * Starts a new process via the zygote mechanism. 624 * 625 * @param processClass Class name whose static main() to run 626 * @param niceName 'nice' process name to appear in ps 627 * @param uid a POSIX uid that the new process should setuid() to 628 * @param gid a POSIX gid that the new process shuold setgid() to 629 * @param gids null-ok; a list of supplementary group IDs that the 630 * new process should setgroup() to. 631 * @param debugFlags Additional flags. 632 * @param targetSdkVersion The target SDK version for the app. 633 * @param seInfo null-ok SELinux information for the new process. 634 * @param abi the ABI the process should use. 635 * @param instructionSet null-ok the instruction set to use. 636 * @param appDataDir null-ok the data directory of the app. 637 * @param extraArgs Additional arguments to supply to the zygote process. 638 * @return An object that describes the result of the attempt to start the process. 639 * @throws ZygoteStartFailedEx if process start failed for any reason 640 */ 641 private static ProcessStartResult startViaZygote(final String processClass, 642 final String niceName, 643 final int uid, final int gid, 644 final int[] gids, 645 int debugFlags, int mountExternal, 646 int targetSdkVersion, 647 String seInfo, 648 String abi, 649 String instructionSet, 650 String appDataDir, 651 String[] extraArgs) 652 throws ZygoteStartFailedEx { 653 synchronized(Process.class) { 654 ArrayList<String> argsForZygote = new ArrayList<String>(); 655 656 // --runtime-args, --setuid=, --setgid=, 657 // and --setgroups= must go first 658 argsForZygote.add("--runtime-args"); 659 argsForZygote.add("--setuid=" + uid); 660 argsForZygote.add("--setgid=" + gid); 661 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 662 argsForZygote.add("--enable-jni-logging"); 663 } 664 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 665 argsForZygote.add("--enable-safemode"); 666 } 667 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 668 argsForZygote.add("--enable-debugger"); 669 } 670 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 671 argsForZygote.add("--enable-checkjni"); 672 } 673 if ((debugFlags & Zygote.DEBUG_GENERATE_DEBUG_INFO) != 0) { 674 argsForZygote.add("--generate-debug-info"); 675 } 676 if ((debugFlags & Zygote.DEBUG_ALWAYS_JIT) != 0) { 677 argsForZygote.add("--always-jit"); 678 } 679 if ((debugFlags & Zygote.DEBUG_NATIVE_DEBUGGABLE) != 0) { 680 argsForZygote.add("--native-debuggable"); 681 } 682 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 683 argsForZygote.add("--enable-assert"); 684 } 685 if (mountExternal == Zygote.MOUNT_EXTERNAL_DEFAULT) { 686 argsForZygote.add("--mount-external-default"); 687 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_READ) { 688 argsForZygote.add("--mount-external-read"); 689 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_WRITE) { 690 argsForZygote.add("--mount-external-write"); 691 } 692 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 693 694 //TODO optionally enable debuger 695 //argsForZygote.add("--enable-debugger"); 696 697 // --setgroups is a comma-separated list 698 if (gids != null && gids.length > 0) { 699 StringBuilder sb = new StringBuilder(); 700 sb.append("--setgroups="); 701 702 int sz = gids.length; 703 for (int i = 0; i < sz; i++) { 704 if (i != 0) { 705 sb.append(','); 706 } 707 sb.append(gids[i]); 708 } 709 710 argsForZygote.add(sb.toString()); 711 } 712 713 if (niceName != null) { 714 argsForZygote.add("--nice-name=" + niceName); 715 } 716 717 if (seInfo != null) { 718 argsForZygote.add("--seinfo=" + seInfo); 719 } 720 721 if (instructionSet != null) { 722 argsForZygote.add("--instruction-set=" + instructionSet); 723 } 724 725 if (appDataDir != null) { 726 argsForZygote.add("--app-data-dir=" + appDataDir); 727 } 728 729 argsForZygote.add(processClass); 730 731 if (extraArgs != null) { 732 for (String arg : extraArgs) { 733 argsForZygote.add(arg); 734 } 735 } 736 737 return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); 738 } 739 } 740 741 /** 742 * Tries to establish a connection to the zygote that handles a given {@code abi}. Might block and retry if the 743 * zygote is unresponsive. This method is a no-op if a connection is already open. 744 * 745 * @hide 746 */ 747 public static void establishZygoteConnectionForAbi(String abi) { 748 try { 749 openZygoteSocketIfNeeded(abi); 750 } catch (ZygoteStartFailedEx ex) { 751 throw new RuntimeException("Unable to connect to zygote for abi: " + abi, ex); 752 } 753 } 754 755 /** 756 * Tries to open socket to Zygote process if not already open. If 757 * already open, does nothing. May block and retry. 758 */ 759 private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx { 760 if (primaryZygoteState == null || primaryZygoteState.isClosed()) { 761 try { 762 primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET); 763 } catch (IOException ioe) { 764 throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe); 765 } 766 } 767 768 if (primaryZygoteState.matches(abi)) { 769 return primaryZygoteState; 770 } 771 772 // The primary zygote didn't match. Try the secondary. 773 if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { 774 try { 775 secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET); 776 } catch (IOException ioe) { 777 throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe); 778 } 779 } 780 781 if (secondaryZygoteState.matches(abi)) { 782 return secondaryZygoteState; 783 } 784 785 throw new ZygoteStartFailedEx("Unsupported zygote ABI: " + abi); 786 } 787 788 /** 789 * Returns elapsed milliseconds of the time this process has run. 790 * @return Returns the number of milliseconds this process has return. 791 */ 792 public static final native long getElapsedCpuTime(); 793 794 /** 795 * Return the {@link SystemClock#elapsedRealtime()} at which this process was started. 796 */ 797 public static final long getStartElapsedRealtime() { 798 return sStartElapsedRealtime; 799 } 800 801 /** 802 * Return the {@link SystemClock#uptimeMillis()} at which this process was started. 803 */ 804 public static final long getStartUptimeMillis() { 805 return sStartUptimeMillis; 806 } 807 808 /** @hide */ 809 public static final void setStartTimes(long elapsedRealtime, long uptimeMillis) { 810 sStartElapsedRealtime = elapsedRealtime; 811 sStartUptimeMillis = uptimeMillis; 812 } 813 814 /** 815 * Returns true if the current process is a 64-bit runtime. 816 */ 817 public static final boolean is64Bit() { 818 return VMRuntime.getRuntime().is64Bit(); 819 } 820 821 /** 822 * Returns the identifier of this process, which can be used with 823 * {@link #killProcess} and {@link #sendSignal}. 824 */ 825 public static final int myPid() { 826 return Os.getpid(); 827 } 828 829 /** 830 * Returns the identifier of this process' parent. 831 * @hide 832 */ 833 public static final int myPpid() { 834 return Os.getppid(); 835 } 836 837 /** 838 * Returns the identifier of the calling thread, which be used with 839 * {@link #setThreadPriority(int, int)}. 840 */ 841 public static final int myTid() { 842 return Os.gettid(); 843 } 844 845 /** 846 * Returns the identifier of this process's uid. This is the kernel uid 847 * that the process is running under, which is the identity of its 848 * app-specific sandbox. It is different from {@link #myUserHandle} in that 849 * a uid identifies a specific app sandbox in a specific user. 850 */ 851 public static final int myUid() { 852 return Os.getuid(); 853 } 854 855 /** 856 * Returns this process's user handle. This is the 857 * user the process is running under. It is distinct from 858 * {@link #myUid()} in that a particular user will have multiple 859 * distinct apps running under it each with their own uid. 860 */ 861 public static UserHandle myUserHandle() { 862 return UserHandle.of(UserHandle.getUserId(myUid())); 863 } 864 865 /** 866 * Returns whether the given uid belongs to an application. 867 * @param uid A kernel uid. 868 * @return Whether the uid corresponds to an application sandbox running in 869 * a specific user. 870 */ 871 public static boolean isApplicationUid(int uid) { 872 return UserHandle.isApp(uid); 873 } 874 875 /** 876 * Returns whether the current process is in an isolated sandbox. 877 * @hide 878 */ 879 public static final boolean isIsolated() { 880 return isIsolated(myUid()); 881 } 882 883 /** {@hide} */ 884 public static final boolean isIsolated(int uid) { 885 uid = UserHandle.getAppId(uid); 886 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 887 } 888 889 /** 890 * Returns the UID assigned to a particular user name, or -1 if there is 891 * none. If the given string consists of only numbers, it is converted 892 * directly to a uid. 893 */ 894 public static final native int getUidForName(String name); 895 896 /** 897 * Returns the GID assigned to a particular user name, or -1 if there is 898 * none. If the given string consists of only numbers, it is converted 899 * directly to a gid. 900 */ 901 public static final native int getGidForName(String name); 902 903 /** 904 * Returns a uid for a currently running process. 905 * @param pid the process id 906 * @return the uid of the process, or -1 if the process is not running. 907 * @hide pending API council review 908 */ 909 public static final int getUidForPid(int pid) { 910 String[] procStatusLabels = { "Uid:" }; 911 long[] procStatusValues = new long[1]; 912 procStatusValues[0] = -1; 913 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 914 return (int) procStatusValues[0]; 915 } 916 917 /** 918 * Returns the parent process id for a currently running process. 919 * @param pid the process id 920 * @return the parent process id of the process, or -1 if the process is not running. 921 * @hide 922 */ 923 public static final int getParentPid(int pid) { 924 String[] procStatusLabels = { "PPid:" }; 925 long[] procStatusValues = new long[1]; 926 procStatusValues[0] = -1; 927 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 928 return (int) procStatusValues[0]; 929 } 930 931 /** 932 * Returns the thread group leader id for a currently running thread. 933 * @param tid the thread id 934 * @return the thread group leader id of the thread, or -1 if the thread is not running. 935 * This is same as what getpid(2) would return if called by tid. 936 * @hide 937 */ 938 public static final int getThreadGroupLeader(int tid) { 939 String[] procStatusLabels = { "Tgid:" }; 940 long[] procStatusValues = new long[1]; 941 procStatusValues[0] = -1; 942 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 943 return (int) procStatusValues[0]; 944 } 945 946 /** 947 * Set the priority of a thread, based on Linux priorities. 948 * 949 * @param tid The identifier of the thread/process to change. 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 public static final native void setThreadPriority(int tid, int priority) 960 throws IllegalArgumentException, SecurityException; 961 962 /** 963 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 964 * throw an exception if passed a background-level thread priority. This is only 965 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 966 * 967 * @hide 968 */ 969 public static final native void setCanSelfBackground(boolean backgroundOk); 970 971 /** 972 * Sets the scheduling group for a thread. 973 * @hide 974 * @param tid The identifier of the thread to change. 975 * @param group The target group for this thread from THREAD_GROUP_*. 976 * 977 * @throws IllegalArgumentException Throws IllegalArgumentException if 978 * <var>tid</var> does not exist. 979 * @throws SecurityException Throws SecurityException if your process does 980 * not have permission to modify the given thread, or to use the given 981 * priority. 982 * If the thread is a thread group leader, that is it's gettid() == getpid(), 983 * then the other threads in the same thread group are _not_ affected. 984 * 985 * Does not set cpuset for some historical reason, just calls 986 * libcutils::set_sched_policy(). 987 */ 988 public static final native void setThreadGroup(int tid, int group) 989 throws IllegalArgumentException, SecurityException; 990 991 /** 992 * Sets the scheduling group for a process and all child threads 993 * @hide 994 * @param pid The identifier of the process to change. 995 * @param group The target group for this process from THREAD_GROUP_*. 996 * 997 * @throws IllegalArgumentException Throws IllegalArgumentException if 998 * <var>tid</var> does not exist. 999 * @throws SecurityException Throws SecurityException if your process does 1000 * not have permission to modify the given thread, or to use the given 1001 * priority. 1002 * 1003 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 1004 * threads to the foreground scheduling group, but to leave background 1005 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 1006 * threads, regardless of priority, to the background scheduling group. 1007 * group == THREAD_GROUP_FOREGROUND is not allowed. 1008 * 1009 * Always sets cpusets. 1010 */ 1011 public static final native void setProcessGroup(int pid, int group) 1012 throws IllegalArgumentException, SecurityException; 1013 1014 /** 1015 * Return the scheduling group of requested process. 1016 * 1017 * @hide 1018 */ 1019 public static final native int getProcessGroup(int pid) 1020 throws IllegalArgumentException, SecurityException; 1021 1022 /** 1023 * On some devices, the foreground process may have one or more CPU 1024 * cores exclusively reserved for it. This method can be used to 1025 * retrieve which cores that are (if any), so the calling process 1026 * can then use sched_setaffinity() to lock a thread to these cores. 1027 * Note that the calling process must currently be running in the 1028 * foreground for this method to return any cores. 1029 * 1030 * The CPU core(s) exclusively reserved for the foreground process will 1031 * stay reserved for as long as the process stays in the foreground. 1032 * 1033 * As soon as a process leaves the foreground, those CPU cores will 1034 * no longer be reserved for it, and will most likely be reserved for 1035 * the new foreground process. It's not necessary to change the affinity 1036 * of your process when it leaves the foreground (if you had previously 1037 * set it to use a reserved core); the OS will automatically take care 1038 * of resetting the affinity at that point. 1039 * 1040 * @return an array of integers, indicating the CPU cores exclusively 1041 * reserved for this process. The array will have length zero if no 1042 * CPU cores are exclusively reserved for this process at this point 1043 * in time. 1044 */ 1045 public static final native int[] getExclusiveCores(); 1046 1047 /** 1048 * Set the priority of the calling thread, based on Linux priorities. See 1049 * {@link #setThreadPriority(int, int)} for more information. 1050 * 1051 * @param priority A Linux priority level, from -20 for highest scheduling 1052 * priority to 19 for lowest scheduling priority. 1053 * 1054 * @throws IllegalArgumentException Throws IllegalArgumentException if 1055 * <var>tid</var> does not exist. 1056 * @throws SecurityException Throws SecurityException if your process does 1057 * not have permission to modify the given thread, or to use the given 1058 * priority. 1059 * 1060 * @see #setThreadPriority(int, int) 1061 */ 1062 public static final native void setThreadPriority(int priority) 1063 throws IllegalArgumentException, SecurityException; 1064 1065 /** 1066 * Return the current priority of a thread, based on Linux priorities. 1067 * 1068 * @param tid The identifier of the thread/process to change. 1069 * 1070 * @return Returns the current priority, as a Linux priority level, 1071 * from -20 for highest scheduling priority to 19 for lowest scheduling 1072 * priority. 1073 * 1074 * @throws IllegalArgumentException Throws IllegalArgumentException if 1075 * <var>tid</var> does not exist. 1076 */ 1077 public static final native int getThreadPriority(int tid) 1078 throws IllegalArgumentException; 1079 1080 /** 1081 * Return the current scheduling policy of a thread, based on Linux. 1082 * 1083 * @param tid The identifier of the thread/process to get the scheduling policy. 1084 * 1085 * @throws IllegalArgumentException Throws IllegalArgumentException if 1086 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 1087 * @throws SecurityException Throws SecurityException if your process does 1088 * not have permission to modify the given thread, or to use the given 1089 * scheduling policy or priority. 1090 * 1091 * {@hide} 1092 */ 1093 1094 @TestApi 1095 public static final native int getThreadScheduler(int tid) 1096 throws IllegalArgumentException; 1097 1098 /** 1099 * Set the scheduling policy and priority of a thread, based on Linux. 1100 * 1101 * @param tid The identifier of the thread/process to change. 1102 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 1103 * @param priority A Linux priority level in a range appropriate for the given policy. 1104 * 1105 * @throws IllegalArgumentException Throws IllegalArgumentException if 1106 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 1107 * @throws SecurityException Throws SecurityException if your process does 1108 * not have permission to modify the given thread, or to use the given 1109 * scheduling policy or priority. 1110 * 1111 * {@hide} 1112 */ 1113 1114 public static final native void setThreadScheduler(int tid, int policy, int priority) 1115 throws IllegalArgumentException; 1116 1117 /** 1118 * Determine whether the current environment supports multiple processes. 1119 * 1120 * @return Returns true if the system can run in multiple processes, else 1121 * false if everything is running in a single process. 1122 * 1123 * @deprecated This method always returns true. Do not use. 1124 */ 1125 @Deprecated 1126 public static final boolean supportsProcesses() { 1127 return true; 1128 } 1129 1130 /** 1131 * Adjust the swappiness level for a process. 1132 * 1133 * @param pid The process identifier to set. 1134 * @param is_increased Whether swappiness should be increased or default. 1135 * 1136 * @return Returns true if the underlying system supports this 1137 * feature, else false. 1138 * 1139 * {@hide} 1140 */ 1141 public static final native boolean setSwappiness(int pid, boolean is_increased); 1142 1143 /** 1144 * Change this process's argv[0] parameter. This can be useful to show 1145 * more descriptive information in things like the 'ps' command. 1146 * 1147 * @param text The new name of this process. 1148 * 1149 * {@hide} 1150 */ 1151 public static final native void setArgV0(String text); 1152 1153 /** 1154 * Kill the process with the given PID. 1155 * Note that, though this API allows us to request to 1156 * kill any process based on its PID, the kernel will 1157 * still impose standard restrictions on which PIDs you 1158 * are actually able to kill. Typically this means only 1159 * the process running the caller's packages/application 1160 * and any additional processes created by that app; packages 1161 * sharing a common UID will also be able to kill each 1162 * other's processes. 1163 */ 1164 public static final void killProcess(int pid) { 1165 sendSignal(pid, SIGNAL_KILL); 1166 } 1167 1168 /** @hide */ 1169 public static final native int setUid(int uid); 1170 1171 /** @hide */ 1172 public static final native int setGid(int uid); 1173 1174 /** 1175 * Send a signal to the given process. 1176 * 1177 * @param pid The pid of the target process. 1178 * @param signal The signal to send. 1179 */ 1180 public static final native void sendSignal(int pid, int signal); 1181 1182 /** 1183 * @hide 1184 * Private impl for avoiding a log message... DO NOT USE without doing 1185 * your own log, or the Android Illuminati will find you some night and 1186 * beat you up. 1187 */ 1188 public static final void killProcessQuiet(int pid) { 1189 sendSignalQuiet(pid, SIGNAL_KILL); 1190 } 1191 1192 /** 1193 * @hide 1194 * Private impl for avoiding a log message... DO NOT USE without doing 1195 * your own log, or the Android Illuminati will find you some night and 1196 * beat you up. 1197 */ 1198 public static final native void sendSignalQuiet(int pid, int signal); 1199 1200 /** @hide */ 1201 public static final native long getFreeMemory(); 1202 1203 /** @hide */ 1204 public static final native long getTotalMemory(); 1205 1206 /** @hide */ 1207 public static final native void readProcLines(String path, 1208 String[] reqFields, long[] outSizes); 1209 1210 /** @hide */ 1211 public static final native int[] getPids(String path, int[] lastArray); 1212 1213 /** @hide */ 1214 public static final int PROC_TERM_MASK = 0xff; 1215 /** @hide */ 1216 public static final int PROC_ZERO_TERM = 0; 1217 /** @hide */ 1218 public static final int PROC_SPACE_TERM = (int)' '; 1219 /** @hide */ 1220 public static final int PROC_TAB_TERM = (int)'\t'; 1221 /** @hide */ 1222 public static final int PROC_COMBINE = 0x100; 1223 /** @hide */ 1224 public static final int PROC_PARENS = 0x200; 1225 /** @hide */ 1226 public static final int PROC_QUOTES = 0x400; 1227 /** @hide */ 1228 public static final int PROC_CHAR = 0x800; 1229 /** @hide */ 1230 public static final int PROC_OUT_STRING = 0x1000; 1231 /** @hide */ 1232 public static final int PROC_OUT_LONG = 0x2000; 1233 /** @hide */ 1234 public static final int PROC_OUT_FLOAT = 0x4000; 1235 1236 /** @hide */ 1237 public static final native boolean readProcFile(String file, int[] format, 1238 String[] outStrings, long[] outLongs, float[] outFloats); 1239 1240 /** @hide */ 1241 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 1242 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 1243 1244 /** @hide */ 1245 public static final native int[] getPidsForCommands(String[] cmds); 1246 1247 /** 1248 * Gets the total Pss value for a given process, in bytes. 1249 * 1250 * @param pid the process to the Pss for 1251 * @return the total Pss value for the given process in bytes, 1252 * or -1 if the value cannot be determined 1253 * @hide 1254 */ 1255 public static final native long getPss(int pid); 1256 1257 /** 1258 * Specifies the outcome of having started a process. 1259 * @hide 1260 */ 1261 public static final class ProcessStartResult { 1262 /** 1263 * The PID of the newly started process. 1264 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1265 */ 1266 public int pid; 1267 1268 /** 1269 * True if the process was started with a wrapper attached. 1270 */ 1271 public boolean usingWrapper; 1272 } 1273 1274 /** 1275 * Kill all processes in a process group started for the given 1276 * pid. 1277 * @hide 1278 */ 1279 public static final native int killProcessGroup(int uid, int pid); 1280 1281 /** 1282 * Remove all process groups. Expected to be called when ActivityManager 1283 * is restarted. 1284 * @hide 1285 */ 1286 public static final native void removeAllProcessGroups(); 1287 1288 /** 1289 * Check to see if a thread belongs to a given process. This may require 1290 * more permissions than apps generally have. 1291 * @return true if this thread belongs to a process 1292 * @hide 1293 */ 1294 public static final boolean isThreadInProcess(int tid, int pid) { 1295 StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads(); 1296 try { 1297 if (Os.access("/proc/" + tid + "/task/" + pid, OsConstants.F_OK)) { 1298 return true; 1299 } else { 1300 return false; 1301 } 1302 } catch (Exception e) { 1303 return false; 1304 } finally { 1305 StrictMode.setThreadPolicy(oldPolicy); 1306 } 1307 1308 } 1309 } 1310
