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 java.io.BufferedWriter; 25 import java.io.DataInputStream; 26 import java.io.IOException; 27 import java.io.OutputStreamWriter; 28 import java.nio.charset.StandardCharsets; 29 import java.util.ArrayList; 30 import java.util.Arrays; 31 import java.util.List; 32 33 /*package*/ class ZygoteStartFailedEx extends Exception { 34 ZygoteStartFailedEx(String s) { 35 super(s); 36 } 37 38 ZygoteStartFailedEx(Throwable cause) { 39 super(cause); 40 } 41 42 ZygoteStartFailedEx(String s, Throwable cause) { 43 super(s, cause); 44 } 45 } 46 47 /** 48 * Tools for managing OS processes. 49 */ 50 public class Process { 51 private static final String LOG_TAG = "Process"; 52 53 /** 54 * @hide for internal use only. 55 */ 56 public static final String ZYGOTE_SOCKET = "zygote"; 57 58 /** 59 * @hide for internal use only. 60 */ 61 public static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary"; 62 63 /** 64 * Defines the root UID. 65 * @hide 66 */ 67 public static final int ROOT_UID = 0; 68 69 /** 70 * Defines the UID/GID under which system code runs. 71 */ 72 public static final int SYSTEM_UID = 1000; 73 74 /** 75 * Defines the UID/GID under which the telephony code runs. 76 */ 77 public static final int PHONE_UID = 1001; 78 79 /** 80 * Defines the UID/GID for the user shell. 81 * @hide 82 */ 83 public static final int SHELL_UID = 2000; 84 85 /** 86 * Defines the UID/GID for the log group. 87 * @hide 88 */ 89 public static final int LOG_UID = 1007; 90 91 /** 92 * Defines the UID/GID for the WIFI supplicant process. 93 * @hide 94 */ 95 public static final int WIFI_UID = 1010; 96 97 /** 98 * Defines the UID/GID for the mediaserver process. 99 * @hide 100 */ 101 public static final int MEDIA_UID = 1013; 102 103 /** 104 * Defines the UID/GID for the DRM process. 105 * @hide 106 */ 107 public static final int DRM_UID = 1019; 108 109 /** 110 * Defines the UID/GID for the group that controls VPN services. 111 * @hide 112 */ 113 public static final int VPN_UID = 1016; 114 115 /** 116 * Defines the UID/GID for the NFC service process. 117 * @hide 118 */ 119 public static final int NFC_UID = 1027; 120 121 /** 122 * Defines the UID/GID for the Bluetooth service process. 123 * @hide 124 */ 125 public static final int BLUETOOTH_UID = 1002; 126 127 /** 128 * Defines the GID for the group that allows write access to the internal media storage. 129 * @hide 130 */ 131 public static final int MEDIA_RW_GID = 1023; 132 133 /** 134 * Access to installed package details 135 * @hide 136 */ 137 public static final int PACKAGE_INFO_GID = 1032; 138 139 /** 140 * Defines the UID/GID for the shared RELRO file updater process. 141 * @hide 142 */ 143 public static final int SHARED_RELRO_UID = 1037; 144 145 /** 146 * Defines the start of a range of UIDs (and GIDs), going from this 147 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 148 * to applications. 149 */ 150 public static final int FIRST_APPLICATION_UID = 10000; 151 152 /** 153 * Last of application-specific UIDs starting at 154 * {@link #FIRST_APPLICATION_UID}. 155 */ 156 public static final int LAST_APPLICATION_UID = 19999; 157 158 /** 159 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 160 * @hide 161 */ 162 public static final int FIRST_ISOLATED_UID = 99000; 163 164 /** 165 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 166 * @hide 167 */ 168 public static final int LAST_ISOLATED_UID = 99999; 169 170 /** 171 * Defines the gid shared by all applications running under the same profile. 172 * @hide 173 */ 174 public static final int SHARED_USER_GID = 9997; 175 176 /** 177 * First gid for applications to share resources. Used when forward-locking 178 * is enabled but all UserHandles need to be able to read the resources. 179 * @hide 180 */ 181 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 182 183 /** 184 * Last 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 LAST_SHARED_APPLICATION_GID = 59999; 189 190 /** 191 * Standard priority of application threads. 192 * Use with {@link #setThreadPriority(int)} and 193 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 194 * {@link java.lang.Thread} class. 195 */ 196 public static final int THREAD_PRIORITY_DEFAULT = 0; 197 198 /* 199 * *************************************** 200 * ** Keep in sync with utils/threads.h ** 201 * *************************************** 202 */ 203 204 /** 205 * Lowest available thread priority. Only for those who really, really 206 * don't want to run if anything else is happening. 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_LOWEST = 19; 212 213 /** 214 * Standard priority background threads. This gives your thread a slightly 215 * lower than normal priority, so that it will have less chance of impacting 216 * the responsiveness of the user interface. 217 * Use with {@link #setThreadPriority(int)} and 218 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 219 * {@link java.lang.Thread} class. 220 */ 221 public static final int THREAD_PRIORITY_BACKGROUND = 10; 222 223 /** 224 * Standard priority of threads that are currently running a user interface 225 * that the user is interacting with. Applications can not normally 226 * change to this priority; the system will automatically adjust your 227 * application threads as the user moves through the UI. 228 * Use with {@link #setThreadPriority(int)} and 229 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 230 * {@link java.lang.Thread} class. 231 */ 232 public static final int THREAD_PRIORITY_FOREGROUND = -2; 233 234 /** 235 * Standard priority of system display threads, involved in updating 236 * the user interface. Applications can not 237 * normally change to this priority. 238 * Use with {@link #setThreadPriority(int)} and 239 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 240 * {@link java.lang.Thread} class. 241 */ 242 public static final int THREAD_PRIORITY_DISPLAY = -4; 243 244 /** 245 * Standard priority of the most important display threads, for compositing 246 * the screen and retrieving input events. Applications can not normally 247 * change to this priority. 248 * Use with {@link #setThreadPriority(int)} and 249 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 250 * {@link java.lang.Thread} class. 251 */ 252 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 253 254 /** 255 * Standard priority of audio threads. Applications can not normally 256 * change to this priority. 257 * Use with {@link #setThreadPriority(int)} and 258 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 259 * {@link java.lang.Thread} class. 260 */ 261 public static final int THREAD_PRIORITY_AUDIO = -16; 262 263 /** 264 * Standard priority of the most important audio threads. 265 * Applications can not normally change to this priority. 266 * Use with {@link #setThreadPriority(int)} and 267 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 268 * {@link java.lang.Thread} class. 269 */ 270 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 271 272 /** 273 * Minimum increment to make a priority more favorable. 274 */ 275 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 276 277 /** 278 * Minimum increment to make a priority less favorable. 279 */ 280 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 281 282 /** 283 * Default scheduling policy 284 * @hide 285 */ 286 public static final int SCHED_OTHER = 0; 287 288 /** 289 * First-In First-Out scheduling policy 290 * @hide 291 */ 292 public static final int SCHED_FIFO = 1; 293 294 /** 295 * Round-Robin scheduling policy 296 * @hide 297 */ 298 public static final int SCHED_RR = 2; 299 300 /** 301 * Batch scheduling policy 302 * @hide 303 */ 304 public static final int SCHED_BATCH = 3; 305 306 /** 307 * Idle scheduling policy 308 * @hide 309 */ 310 public static final int SCHED_IDLE = 5; 311 312 // Keep in sync with SP_* constants of enum type SchedPolicy 313 // declared in system/core/include/cutils/sched_policy.h, 314 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 315 316 /** 317 * Default thread group - 318 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 319 * When used with setProcessGroup(), the group of each thread in the process 320 * is conditionally changed based on that thread's current priority, as follows: 321 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 322 * are moved to foreground thread group. All other threads are left unchanged. 323 * @hide 324 */ 325 public static final int THREAD_GROUP_DEFAULT = -1; 326 327 /** 328 * Background thread group - All threads in 329 * this group are scheduled with a reduced share of the CPU. 330 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 331 * FIXME rename to THREAD_GROUP_BACKGROUND. 332 * @hide 333 */ 334 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 335 336 /** 337 * Foreground thread group - All threads in 338 * this group are scheduled with a normal share of the CPU. 339 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 340 * Not used at this level. 341 * @hide 342 **/ 343 private static final int THREAD_GROUP_FOREGROUND = 1; 344 345 /** 346 * System thread group. 347 * @hide 348 **/ 349 public static final int THREAD_GROUP_SYSTEM = 2; 350 351 /** 352 * Application audio thread group. 353 * @hide 354 **/ 355 public static final int THREAD_GROUP_AUDIO_APP = 3; 356 357 /** 358 * System audio thread group. 359 * @hide 360 **/ 361 public static final int THREAD_GROUP_AUDIO_SYS = 4; 362 363 public static final int SIGNAL_QUIT = 3; 364 public static final int SIGNAL_KILL = 9; 365 public static final int SIGNAL_USR1 = 10; 366 367 /** 368 * State for communicating with the zygote process. 369 * 370 * @hide for internal use only. 371 */ 372 public static class ZygoteState { 373 final LocalSocket socket; 374 final DataInputStream inputStream; 375 final BufferedWriter writer; 376 final List<String> abiList; 377 378 boolean mClosed; 379 380 private ZygoteState(LocalSocket socket, DataInputStream inputStream, 381 BufferedWriter writer, List<String> abiList) { 382 this.socket = socket; 383 this.inputStream = inputStream; 384 this.writer = writer; 385 this.abiList = abiList; 386 } 387 388 public static ZygoteState connect(String socketAddress) throws IOException { 389 DataInputStream zygoteInputStream = null; 390 BufferedWriter zygoteWriter = null; 391 final LocalSocket zygoteSocket = new LocalSocket(); 392 393 try { 394 zygoteSocket.connect(new LocalSocketAddress(socketAddress, 395 LocalSocketAddress.Namespace.RESERVED)); 396 397 zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); 398 399 zygoteWriter = new BufferedWriter(new OutputStreamWriter( 400 zygoteSocket.getOutputStream()), 256); 401 } catch (IOException ex) { 402 try { 403 zygoteSocket.close(); 404 } catch (IOException ignore) { 405 } 406 407 throw ex; 408 } 409 410 String abiListString = getAbiList(zygoteWriter, zygoteInputStream); 411 Log.i("Zygote", "Process: zygote socket opened, supported ABIS: " + abiListString); 412 413 return new ZygoteState(zygoteSocket, zygoteInputStream, zygoteWriter, 414 Arrays.asList(abiListString.split(","))); 415 } 416 417 boolean matches(String abi) { 418 return abiList.contains(abi); 419 } 420 421 public void close() { 422 try { 423 socket.close(); 424 } catch (IOException ex) { 425 Log.e(LOG_TAG,"I/O exception on routine close", ex); 426 } 427 428 mClosed = true; 429 } 430 431 boolean isClosed() { 432 return mClosed; 433 } 434 } 435 436 /** 437 * The state of the connection to the primary zygote. 438 */ 439 static ZygoteState primaryZygoteState; 440 441 /** 442 * The state of the connection to the secondary zygote. 443 */ 444 static ZygoteState secondaryZygoteState; 445 446 /** 447 * Start a new process. 448 * 449 * <p>If processes are enabled, a new process is created and the 450 * static main() function of a <var>processClass</var> is executed there. 451 * The process will continue running after this function returns. 452 * 453 * <p>If processes are not enabled, a new thread in the caller's 454 * process is created and main() of <var>processClass</var> called there. 455 * 456 * <p>The niceName parameter, if not an empty string, is a custom name to 457 * give to the process instead of using processClass. This allows you to 458 * make easily identifyable processes even if you are using the same base 459 * <var>processClass</var> to start them. 460 * 461 * @param processClass The class to use as the process's main entry 462 * point. 463 * @param niceName A more readable name to use for the process. 464 * @param uid The user-id under which the process will run. 465 * @param gid The group-id under which the process will run. 466 * @param gids Additional group-ids associated with the process. 467 * @param debugFlags Additional flags. 468 * @param targetSdkVersion The target SDK version for the app. 469 * @param seInfo null-ok SELinux information for the new process. 470 * @param abi non-null the ABI this app should be started with. 471 * @param instructionSet null-ok the instruction set to use. 472 * @param appDataDir null-ok the data directory of the app. 473 * @param zygoteArgs Additional arguments to supply to the zygote process. 474 * 475 * @return An object that describes the result of the attempt to start the process. 476 * @throws RuntimeException on fatal start failure 477 * 478 * {@hide} 479 */ 480 public static final ProcessStartResult start(final String processClass, 481 final String niceName, 482 int uid, int gid, int[] gids, 483 int debugFlags, int mountExternal, 484 int targetSdkVersion, 485 String seInfo, 486 String abi, 487 String instructionSet, 488 String appDataDir, 489 String[] zygoteArgs) { 490 try { 491 return startViaZygote(processClass, niceName, uid, gid, gids, 492 debugFlags, mountExternal, targetSdkVersion, seInfo, 493 abi, instructionSet, appDataDir, zygoteArgs); 494 } catch (ZygoteStartFailedEx ex) { 495 Log.e(LOG_TAG, 496 "Starting VM process through Zygote failed"); 497 throw new RuntimeException( 498 "Starting VM process through Zygote failed", ex); 499 } 500 } 501 502 /** retry interval for opening a zygote socket */ 503 static final int ZYGOTE_RETRY_MILLIS = 500; 504 505 /** 506 * Queries the zygote for the list of ABIS it supports. 507 * 508 * @throws ZygoteStartFailedEx if the query failed. 509 */ 510 private static String getAbiList(BufferedWriter writer, DataInputStream inputStream) 511 throws IOException { 512 // Each query starts with the argument count (1 in this case) 513 writer.write("1"); 514 // ... followed by a new-line. 515 writer.newLine(); 516 // ... followed by our only argument. 517 writer.write("--query-abi-list"); 518 writer.newLine(); 519 writer.flush(); 520 521 // The response is a length prefixed stream of ASCII bytes. 522 int numBytes = inputStream.readInt(); 523 byte[] bytes = new byte[numBytes]; 524 inputStream.readFully(bytes); 525 526 return new String(bytes, StandardCharsets.US_ASCII); 527 } 528 529 /** 530 * Sends an argument list to the zygote process, which starts a new child 531 * and returns the child's pid. Please note: the present implementation 532 * replaces newlines in the argument list with spaces. 533 * 534 * @throws ZygoteStartFailedEx if process start failed for any reason 535 */ 536 private static ProcessStartResult zygoteSendArgsAndGetResult( 537 ZygoteState zygoteState, ArrayList<String> args) 538 throws ZygoteStartFailedEx { 539 try { 540 /** 541 * See com.android.internal.os.ZygoteInit.readArgumentList() 542 * Presently the wire format to the zygote process is: 543 * a) a count of arguments (argc, in essence) 544 * b) a number of newline-separated argument strings equal to count 545 * 546 * After the zygote process reads these it will write the pid of 547 * the child or -1 on failure, followed by boolean to 548 * indicate whether a wrapper process was used. 549 */ 550 final BufferedWriter writer = zygoteState.writer; 551 final DataInputStream inputStream = zygoteState.inputStream; 552 553 writer.write(Integer.toString(args.size())); 554 writer.newLine(); 555 556 int sz = args.size(); 557 for (int i = 0; i < sz; i++) { 558 String arg = args.get(i); 559 if (arg.indexOf('\n') >= 0) { 560 throw new ZygoteStartFailedEx( 561 "embedded newlines not allowed"); 562 } 563 writer.write(arg); 564 writer.newLine(); 565 } 566 567 writer.flush(); 568 569 // Should there be a timeout on this? 570 ProcessStartResult result = new ProcessStartResult(); 571 result.pid = inputStream.readInt(); 572 if (result.pid < 0) { 573 throw new ZygoteStartFailedEx("fork() failed"); 574 } 575 result.usingWrapper = inputStream.readBoolean(); 576 return result; 577 } catch (IOException ex) { 578 zygoteState.close(); 579 throw new ZygoteStartFailedEx(ex); 580 } 581 } 582 583 /** 584 * Starts a new process via the zygote mechanism. 585 * 586 * @param processClass Class name whose static main() to run 587 * @param niceName 'nice' process name to appear in ps 588 * @param uid a POSIX uid that the new process should setuid() to 589 * @param gid a POSIX gid that the new process shuold setgid() to 590 * @param gids null-ok; a list of supplementary group IDs that the 591 * new process should setgroup() to. 592 * @param debugFlags Additional flags. 593 * @param targetSdkVersion The target SDK version for the app. 594 * @param seInfo null-ok SELinux information for the new process. 595 * @param abi the ABI the process should use. 596 * @param instructionSet null-ok the instruction set to use. 597 * @param appDataDir null-ok the data directory of the app. 598 * @param extraArgs Additional arguments to supply to the zygote process. 599 * @return An object that describes the result of the attempt to start the process. 600 * @throws ZygoteStartFailedEx if process start failed for any reason 601 */ 602 private static ProcessStartResult startViaZygote(final String processClass, 603 final String niceName, 604 final int uid, final int gid, 605 final int[] gids, 606 int debugFlags, int mountExternal, 607 int targetSdkVersion, 608 String seInfo, 609 String abi, 610 String instructionSet, 611 String appDataDir, 612 String[] extraArgs) 613 throws ZygoteStartFailedEx { 614 synchronized(Process.class) { 615 ArrayList<String> argsForZygote = new ArrayList<String>(); 616 617 // --runtime-init, --setuid=, --setgid=, 618 // and --setgroups= must go first 619 argsForZygote.add("--runtime-init"); 620 argsForZygote.add("--setuid=" + uid); 621 argsForZygote.add("--setgid=" + gid); 622 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 623 argsForZygote.add("--enable-jni-logging"); 624 } 625 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 626 argsForZygote.add("--enable-safemode"); 627 } 628 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 629 argsForZygote.add("--enable-debugger"); 630 } 631 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 632 argsForZygote.add("--enable-checkjni"); 633 } 634 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 635 argsForZygote.add("--enable-assert"); 636 } 637 if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER) { 638 argsForZygote.add("--mount-external-multiuser"); 639 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER_ALL) { 640 argsForZygote.add("--mount-external-multiuser-all"); 641 } 642 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 643 644 //TODO optionally enable debuger 645 //argsForZygote.add("--enable-debugger"); 646 647 // --setgroups is a comma-separated list 648 if (gids != null && gids.length > 0) { 649 StringBuilder sb = new StringBuilder(); 650 sb.append("--setgroups="); 651 652 int sz = gids.length; 653 for (int i = 0; i < sz; i++) { 654 if (i != 0) { 655 sb.append(','); 656 } 657 sb.append(gids[i]); 658 } 659 660 argsForZygote.add(sb.toString()); 661 } 662 663 if (niceName != null) { 664 argsForZygote.add("--nice-name=" + niceName); 665 } 666 667 if (seInfo != null) { 668 argsForZygote.add("--seinfo=" + seInfo); 669 } 670 671 if (instructionSet != null) { 672 argsForZygote.add("--instruction-set=" + instructionSet); 673 } 674 675 if (appDataDir != null) { 676 argsForZygote.add("--app-data-dir=" + appDataDir); 677 } 678 679 argsForZygote.add(processClass); 680 681 if (extraArgs != null) { 682 for (String arg : extraArgs) { 683 argsForZygote.add(arg); 684 } 685 } 686 687 return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); 688 } 689 } 690 691 /** 692 * Tries to establish a connection to the zygote that handles a given {@code abi}. Might block and retry if the 693 * zygote is unresponsive. This method is a no-op if a connection is already open. 694 * 695 * @hide 696 */ 697 public static void establishZygoteConnectionForAbi(String abi) { 698 try { 699 openZygoteSocketIfNeeded(abi); 700 } catch (ZygoteStartFailedEx ex) { 701 throw new RuntimeException("Unable to connect to zygote for abi: " + abi, ex); 702 } 703 } 704 705 /** 706 * Tries to open socket to Zygote process if not already open. If 707 * already open, does nothing. May block and retry. 708 */ 709 private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx { 710 if (primaryZygoteState == null || primaryZygoteState.isClosed()) { 711 try { 712 primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET); 713 } catch (IOException ioe) { 714 throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe); 715 } 716 } 717 718 if (primaryZygoteState.matches(abi)) { 719 return primaryZygoteState; 720 } 721 722 // The primary zygote didn't match. Try the secondary. 723 if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { 724 try { 725 secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET); 726 } catch (IOException ioe) { 727 throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe); 728 } 729 } 730 731 if (secondaryZygoteState.matches(abi)) { 732 return secondaryZygoteState; 733 } 734 735 throw new ZygoteStartFailedEx("Unsupported zygote ABI: " + abi); 736 } 737 738 /** 739 * Returns elapsed milliseconds of the time this process has run. 740 * @return Returns the number of milliseconds this process has return. 741 */ 742 public static final native long getElapsedCpuTime(); 743 744 /** 745 * Returns the identifier of this process, which can be used with 746 * {@link #killProcess} and {@link #sendSignal}. 747 */ 748 public static final int myPid() { 749 return Os.getpid(); 750 } 751 752 /** 753 * Returns the identifier of this process' parent. 754 * @hide 755 */ 756 public static final int myPpid() { 757 return Os.getppid(); 758 } 759 760 /** 761 * Returns the identifier of the calling thread, which be used with 762 * {@link #setThreadPriority(int, int)}. 763 */ 764 public static final int myTid() { 765 return Os.gettid(); 766 } 767 768 /** 769 * Returns the identifier of this process's uid. This is the kernel uid 770 * that the process is running under, which is the identity of its 771 * app-specific sandbox. It is different from {@link #myUserHandle} in that 772 * a uid identifies a specific app sandbox in a specific user. 773 */ 774 public static final int myUid() { 775 return Os.getuid(); 776 } 777 778 /** 779 * Returns this process's user handle. This is the 780 * user the process is running under. It is distinct from 781 * {@link #myUid()} in that a particular user will have multiple 782 * distinct apps running under it each with their own uid. 783 */ 784 public static final UserHandle myUserHandle() { 785 return new UserHandle(UserHandle.getUserId(myUid())); 786 } 787 788 /** 789 * Returns whether the current process is in an isolated sandbox. 790 * @hide 791 */ 792 public static final boolean isIsolated() { 793 int uid = UserHandle.getAppId(myUid()); 794 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 795 } 796 797 /** 798 * Returns the UID assigned to a particular user name, or -1 if there is 799 * none. If the given string consists of only numbers, it is converted 800 * directly to a uid. 801 */ 802 public static final native int getUidForName(String name); 803 804 /** 805 * Returns the GID assigned to a particular user name, or -1 if there is 806 * none. If the given string consists of only numbers, it is converted 807 * directly to a gid. 808 */ 809 public static final native int getGidForName(String name); 810 811 /** 812 * Returns a uid for a currently running process. 813 * @param pid the process id 814 * @return the uid of the process, or -1 if the process is not running. 815 * @hide pending API council review 816 */ 817 public static final int getUidForPid(int pid) { 818 String[] procStatusLabels = { "Uid:" }; 819 long[] procStatusValues = new long[1]; 820 procStatusValues[0] = -1; 821 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 822 return (int) procStatusValues[0]; 823 } 824 825 /** 826 * Returns the parent process id for a currently running process. 827 * @param pid the process id 828 * @return the parent process id of the process, or -1 if the process is not running. 829 * @hide 830 */ 831 public static final int getParentPid(int pid) { 832 String[] procStatusLabels = { "PPid:" }; 833 long[] procStatusValues = new long[1]; 834 procStatusValues[0] = -1; 835 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 836 return (int) procStatusValues[0]; 837 } 838 839 /** 840 * Returns the thread group leader id for a currently running thread. 841 * @param tid the thread id 842 * @return the thread group leader id of the thread, or -1 if the thread is not running. 843 * This is same as what getpid(2) would return if called by tid. 844 * @hide 845 */ 846 public static final int getThreadGroupLeader(int tid) { 847 String[] procStatusLabels = { "Tgid:" }; 848 long[] procStatusValues = new long[1]; 849 procStatusValues[0] = -1; 850 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 851 return (int) procStatusValues[0]; 852 } 853 854 /** 855 * Set the priority of a thread, based on Linux priorities. 856 * 857 * @param tid The identifier of the thread/process to change. 858 * @param priority A Linux priority level, from -20 for highest scheduling 859 * priority to 19 for lowest scheduling priority. 860 * 861 * @throws IllegalArgumentException Throws IllegalArgumentException if 862 * <var>tid</var> does not exist. 863 * @throws SecurityException Throws SecurityException if your process does 864 * not have permission to modify the given thread, or to use the given 865 * priority. 866 */ 867 public static final native void setThreadPriority(int tid, int priority) 868 throws IllegalArgumentException, SecurityException; 869 870 /** 871 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 872 * throw an exception if passed a background-level thread priority. This is only 873 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 874 * 875 * @hide 876 */ 877 public static final native void setCanSelfBackground(boolean backgroundOk); 878 879 /** 880 * Sets the scheduling group for a thread. 881 * @hide 882 * @param tid The identifier of the thread to change. 883 * @param group The target group for this thread from THREAD_GROUP_*. 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 * If the thread is a thread group leader, that is it's gettid() == getpid(), 891 * then the other threads in the same thread group are _not_ affected. 892 */ 893 public static final native void setThreadGroup(int tid, int group) 894 throws IllegalArgumentException, SecurityException; 895 896 /** 897 * Sets the scheduling group for a process and all child threads 898 * @hide 899 * @param pid The identifier of the process to change. 900 * @param group The target group for this process from THREAD_GROUP_*. 901 * 902 * @throws IllegalArgumentException Throws IllegalArgumentException if 903 * <var>tid</var> does not exist. 904 * @throws SecurityException Throws SecurityException if your process does 905 * not have permission to modify the given thread, or to use the given 906 * priority. 907 * 908 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 909 * threads to the foreground scheduling group, but to leave background 910 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 911 * threads, regardless of priority, to the background scheduling group. 912 * group == THREAD_GROUP_FOREGROUND is not allowed. 913 */ 914 public static final native void setProcessGroup(int pid, int group) 915 throws IllegalArgumentException, SecurityException; 916 917 /** 918 * Return the scheduling group of requested process. 919 * 920 * @hide 921 */ 922 public static final native int getProcessGroup(int pid) 923 throws IllegalArgumentException, SecurityException; 924 925 /** 926 * Set the priority of the calling thread, based on Linux priorities. See 927 * {@link #setThreadPriority(int, int)} for more information. 928 * 929 * @param priority A Linux priority level, from -20 for highest scheduling 930 * priority to 19 for lowest scheduling priority. 931 * 932 * @throws IllegalArgumentException Throws IllegalArgumentException if 933 * <var>tid</var> does not exist. 934 * @throws SecurityException Throws SecurityException if your process does 935 * not have permission to modify the given thread, or to use the given 936 * priority. 937 * 938 * @see #setThreadPriority(int, int) 939 */ 940 public static final native void setThreadPriority(int priority) 941 throws IllegalArgumentException, SecurityException; 942 943 /** 944 * Return the current priority of a thread, based on Linux priorities. 945 * 946 * @param tid The identifier of the thread/process to change. 947 * 948 * @return Returns the current priority, as a Linux priority level, 949 * from -20 for highest scheduling priority to 19 for lowest scheduling 950 * priority. 951 * 952 * @throws IllegalArgumentException Throws IllegalArgumentException if 953 * <var>tid</var> does not exist. 954 */ 955 public static final native int getThreadPriority(int tid) 956 throws IllegalArgumentException; 957 958 /** 959 * Set the scheduling policy and priority of a thread, based on Linux. 960 * 961 * @param tid The identifier of the thread/process to change. 962 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 963 * @param priority A Linux priority level in a range appropriate for the given policy. 964 * 965 * @throws IllegalArgumentException Throws IllegalArgumentException if 966 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 967 * @throws SecurityException Throws SecurityException if your process does 968 * not have permission to modify the given thread, or to use the given 969 * scheduling policy or priority. 970 * 971 * {@hide} 972 */ 973 public static final native void setThreadScheduler(int tid, int policy, int priority) 974 throws IllegalArgumentException; 975 976 /** 977 * Determine whether the current environment supports multiple processes. 978 * 979 * @return Returns true if the system can run in multiple processes, else 980 * false if everything is running in a single process. 981 * 982 * @deprecated This method always returns true. Do not use. 983 */ 984 @Deprecated 985 public static final boolean supportsProcesses() { 986 return true; 987 } 988 989 /** 990 * Adjust the swappiness level for a process. 991 * 992 * @param pid The process identifier to set. 993 * @param is_increased Whether swappiness should be increased or default. 994 * 995 * @return Returns true if the underlying system supports this 996 * feature, else false. 997 * 998 * {@hide} 999 */ 1000 public static final native boolean setSwappiness(int pid, boolean is_increased); 1001 1002 /** 1003 * Change this process's argv[0] parameter. This can be useful to show 1004 * more descriptive information in things like the 'ps' command. 1005 * 1006 * @param text The new name of this process. 1007 * 1008 * {@hide} 1009 */ 1010 public static final native void setArgV0(String text); 1011 1012 /** 1013 * Kill the process with the given PID. 1014 * Note that, though this API allows us to request to 1015 * kill any process based on its PID, the kernel will 1016 * still impose standard restrictions on which PIDs you 1017 * are actually able to kill. Typically this means only 1018 * the process running the caller's packages/application 1019 * and any additional processes created by that app; packages 1020 * sharing a common UID will also be able to kill each 1021 * other's processes. 1022 */ 1023 public static final void killProcess(int pid) { 1024 sendSignal(pid, SIGNAL_KILL); 1025 } 1026 1027 /** @hide */ 1028 public static final native int setUid(int uid); 1029 1030 /** @hide */ 1031 public static final native int setGid(int uid); 1032 1033 /** 1034 * Send a signal to the given process. 1035 * 1036 * @param pid The pid of the target process. 1037 * @param signal The signal to send. 1038 */ 1039 public static final native void sendSignal(int pid, int signal); 1040 1041 /** 1042 * @hide 1043 * Private impl for avoiding a log message... DO NOT USE without doing 1044 * your own log, or the Android Illuminati will find you some night and 1045 * beat you up. 1046 */ 1047 public static final void killProcessQuiet(int pid) { 1048 sendSignalQuiet(pid, SIGNAL_KILL); 1049 } 1050 1051 /** 1052 * @hide 1053 * Private impl for avoiding a log message... DO NOT USE without doing 1054 * your own log, or the Android Illuminati will find you some night and 1055 * beat you up. 1056 */ 1057 public static final native void sendSignalQuiet(int pid, int signal); 1058 1059 /** @hide */ 1060 public static final native long getFreeMemory(); 1061 1062 /** @hide */ 1063 public static final native long getTotalMemory(); 1064 1065 /** @hide */ 1066 public static final native void readProcLines(String path, 1067 String[] reqFields, long[] outSizes); 1068 1069 /** @hide */ 1070 public static final native int[] getPids(String path, int[] lastArray); 1071 1072 /** @hide */ 1073 public static final int PROC_TERM_MASK = 0xff; 1074 /** @hide */ 1075 public static final int PROC_ZERO_TERM = 0; 1076 /** @hide */ 1077 public static final int PROC_SPACE_TERM = (int)' '; 1078 /** @hide */ 1079 public static final int PROC_TAB_TERM = (int)'\t'; 1080 /** @hide */ 1081 public static final int PROC_COMBINE = 0x100; 1082 /** @hide */ 1083 public static final int PROC_PARENS = 0x200; 1084 /** @hide */ 1085 public static final int PROC_QUOTES = 0x400; 1086 /** @hide */ 1087 public static final int PROC_OUT_STRING = 0x1000; 1088 /** @hide */ 1089 public static final int PROC_OUT_LONG = 0x2000; 1090 /** @hide */ 1091 public static final int PROC_OUT_FLOAT = 0x4000; 1092 1093 /** @hide */ 1094 public static final native boolean readProcFile(String file, int[] format, 1095 String[] outStrings, long[] outLongs, float[] outFloats); 1096 1097 /** @hide */ 1098 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 1099 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 1100 1101 /** @hide */ 1102 public static final native int[] getPidsForCommands(String[] cmds); 1103 1104 /** 1105 * Gets the total Pss value for a given process, in bytes. 1106 * 1107 * @param pid the process to the Pss for 1108 * @return the total Pss value for the given process in bytes, 1109 * or -1 if the value cannot be determined 1110 * @hide 1111 */ 1112 public static final native long getPss(int pid); 1113 1114 /** 1115 * Specifies the outcome of having started a process. 1116 * @hide 1117 */ 1118 public static final class ProcessStartResult { 1119 /** 1120 * The PID of the newly started process. 1121 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1122 */ 1123 public int pid; 1124 1125 /** 1126 * True if the process was started with a wrapper attached. 1127 */ 1128 public boolean usingWrapper; 1129 } 1130 1131 /** 1132 * Kill all processes in a process group started for the given 1133 * pid. 1134 * @hide 1135 */ 1136 public static final native int killProcessGroup(int uid, int pid); 1137 1138 /** 1139 * Remove all process groups. Expected to be called when ActivityManager 1140 * is restarted. 1141 * @hide 1142 */ 1143 public static final native void removeAllProcessGroups(); 1144 } 1145
