Process.java revision 2bca868361b41ff6a8228824cbecadc4c5deb44e
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.os; 18 19import android.net.LocalSocketAddress; 20import android.net.LocalSocket; 21import android.util.Log; 22import dalvik.system.Zygote; 23 24import java.io.BufferedWriter; 25import java.io.DataInputStream; 26import java.io.IOException; 27import java.io.OutputStreamWriter; 28import java.util.ArrayList; 29 30/*package*/ class ZygoteStartFailedEx extends Exception { 31 /** 32 * Something prevented the zygote process startup from happening normally 33 */ 34 35 ZygoteStartFailedEx() {}; 36 ZygoteStartFailedEx(String s) {super(s);} 37 ZygoteStartFailedEx(Throwable cause) {super(cause);} 38} 39 40/** 41 * Tools for managing OS processes. 42 */ 43public class Process { 44 private static final String LOG_TAG = "Process"; 45 46 private static final String ZYGOTE_SOCKET = "zygote"; 47 48 /** 49 * Name of a process for running the platform's media services. 50 * {@hide} 51 */ 52 public static final String ANDROID_SHARED_MEDIA = "com.android.process.media"; 53 54 /** 55 * Name of the process that Google content providers can share. 56 * {@hide} 57 */ 58 public static final String GOOGLE_SHARED_APP_CONTENT = "com.google.process.content"; 59 60 /** 61 * Defines the UID/GID under which system code runs. 62 */ 63 public static final int SYSTEM_UID = 1000; 64 65 /** 66 * Defines the UID/GID under which the telephony code runs. 67 */ 68 public static final int PHONE_UID = 1001; 69 70 /** 71 * Defines the UID/GID for the user shell. 72 * @hide 73 */ 74 public static final int SHELL_UID = 2000; 75 76 /** 77 * Defines the UID/GID for the log group. 78 * @hide 79 */ 80 public static final int LOG_UID = 1007; 81 82 /** 83 * Defines the UID/GID for the WIFI supplicant process. 84 * @hide 85 */ 86 public static final int WIFI_UID = 1010; 87 88 /** 89 * Defines the UID/GID for the mediaserver process. 90 * @hide 91 */ 92 public static final int MEDIA_UID = 1013; 93 94 /** 95 * Defines the UID/GID for the DRM process. 96 * @hide 97 */ 98 public static final int DRM_UID = 1019; 99 100 /** 101 * Defines the GID for the group that allows write access to the SD card. 102 * @hide 103 */ 104 public static final int SDCARD_RW_GID = 1015; 105 106 /** 107 * Defines the UID/GID for the group that controls VPN services. 108 * @hide 109 */ 110 public static final int VPN_UID = 1016; 111 112 /** 113 * Defines the UID/GID for the NFC service process. 114 * @hide 115 */ 116 public static final int NFC_UID = 1027; 117 118 /** 119 * Defines the UID/GID for the Bluetooth service process. 120 * @hide 121 */ 122 public static final int BLUETOOTH_UID = 1002; 123 124 /** 125 * Defines the GID for the group that allows write access to the internal media storage. 126 * @hide 127 */ 128 public static final int MEDIA_RW_GID = 1023; 129 130 /** 131 * Defines the start of a range of UIDs (and GIDs), going from this 132 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 133 * to applications. 134 */ 135 public static final int FIRST_APPLICATION_UID = 10000; 136 /** 137 * Last of application-specific UIDs starting at 138 * {@link #FIRST_APPLICATION_UID}. 139 */ 140 public static final int LAST_APPLICATION_UID = 19999; 141 142 /** 143 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 144 * @hide 145 */ 146 public static final int FIRST_ISOLATED_UID = 99000; 147 148 /** 149 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 150 * @hide 151 */ 152 public static final int LAST_ISOLATED_UID = 99999; 153 154 /** 155 * Defines a secondary group id for access to the bluetooth hardware. 156 */ 157 public static final int BLUETOOTH_GID = 2000; 158 159 /** 160 * Standard priority of application threads. 161 * Use with {@link #setThreadPriority(int)} and 162 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 163 * {@link java.lang.Thread} class. 164 */ 165 public static final int THREAD_PRIORITY_DEFAULT = 0; 166 167 /* 168 * *************************************** 169 * ** Keep in sync with utils/threads.h ** 170 * *************************************** 171 */ 172 173 /** 174 * Lowest available thread priority. Only for those who really, really 175 * don't want to run if anything else is happening. 176 * Use with {@link #setThreadPriority(int)} and 177 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 178 * {@link java.lang.Thread} class. 179 */ 180 public static final int THREAD_PRIORITY_LOWEST = 19; 181 182 /** 183 * Standard priority background threads. This gives your thread a slightly 184 * lower than normal priority, so that it will have less chance of impacting 185 * the responsiveness of the user interface. 186 * Use with {@link #setThreadPriority(int)} and 187 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 188 * {@link java.lang.Thread} class. 189 */ 190 public static final int THREAD_PRIORITY_BACKGROUND = 10; 191 192 /** 193 * Standard priority of threads that are currently running a user interface 194 * that the user is interacting with. Applications can not normally 195 * change to this priority; the system will automatically adjust your 196 * application threads as the user moves through the UI. 197 * Use with {@link #setThreadPriority(int)} and 198 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 199 * {@link java.lang.Thread} class. 200 */ 201 public static final int THREAD_PRIORITY_FOREGROUND = -2; 202 203 /** 204 * Standard priority of system display threads, involved in updating 205 * the user interface. Applications can not 206 * normally change to this priority. 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_DISPLAY = -4; 212 213 /** 214 * Standard priority of the most important display threads, for compositing 215 * the screen and retrieving input events. Applications can not normally 216 * change to this priority. 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_URGENT_DISPLAY = -8; 222 223 /** 224 * Standard priority of audio threads. Applications can not normally 225 * change to this priority. 226 * Use with {@link #setThreadPriority(int)} and 227 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 228 * {@link java.lang.Thread} class. 229 */ 230 public static final int THREAD_PRIORITY_AUDIO = -16; 231 232 /** 233 * Standard priority of the most important audio threads. 234 * Applications can not normally change to this priority. 235 * Use with {@link #setThreadPriority(int)} and 236 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 237 * {@link java.lang.Thread} class. 238 */ 239 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 240 241 /** 242 * Minimum increment to make a priority more favorable. 243 */ 244 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 245 246 /** 247 * Minimum increment to make a priority less favorable. 248 */ 249 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 250 251 /** 252 * Default scheduling policy 253 * @hide 254 */ 255 public static final int SCHED_OTHER = 0; 256 257 /** 258 * First-In First-Out scheduling policy 259 * @hide 260 */ 261 public static final int SCHED_FIFO = 1; 262 263 /** 264 * Round-Robin scheduling policy 265 * @hide 266 */ 267 public static final int SCHED_RR = 2; 268 269 /** 270 * Batch scheduling policy 271 * @hide 272 */ 273 public static final int SCHED_BATCH = 3; 274 275 /** 276 * Idle scheduling policy 277 * @hide 278 */ 279 public static final int SCHED_IDLE = 5; 280 281 // Keep in sync with SP_* constants of enum type SchedPolicy 282 // declared in system/core/include/cutils/sched_policy.h, 283 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 284 285 /** 286 * Default thread group - 287 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 288 * When used with setProcessGroup(), the group of each thread in the process 289 * is conditionally changed based on that thread's current priority, as follows: 290 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 291 * are moved to foreground thread group. All other threads are left unchanged. 292 * @hide 293 */ 294 public static final int THREAD_GROUP_DEFAULT = -1; 295 296 /** 297 * Background thread group - All threads in 298 * this group are scheduled with a reduced share of the CPU. 299 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 300 * FIXME rename to THREAD_GROUP_BACKGROUND. 301 * @hide 302 */ 303 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 304 305 /** 306 * Foreground thread group - All threads in 307 * this group are scheduled with a normal share of the CPU. 308 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 309 * Not used at this level. 310 * @hide 311 **/ 312 private static final int THREAD_GROUP_FOREGROUND = 1; 313 314 /** 315 * System thread group. 316 * @hide 317 **/ 318 public static final int THREAD_GROUP_SYSTEM = 2; 319 320 /** 321 * Application audio thread group. 322 * @hide 323 **/ 324 public static final int THREAD_GROUP_AUDIO_APP = 3; 325 326 /** 327 * System audio thread group. 328 * @hide 329 **/ 330 public static final int THREAD_GROUP_AUDIO_SYS = 4; 331 332 public static final int SIGNAL_QUIT = 3; 333 public static final int SIGNAL_KILL = 9; 334 public static final int SIGNAL_USR1 = 10; 335 336 // State for communicating with zygote process 337 338 static LocalSocket sZygoteSocket; 339 static DataInputStream sZygoteInputStream; 340 static BufferedWriter sZygoteWriter; 341 342 /** true if previous zygote open failed */ 343 static boolean sPreviousZygoteOpenFailed; 344 345 /** 346 * Start a new process. 347 * 348 * <p>If processes are enabled, a new process is created and the 349 * static main() function of a <var>processClass</var> is executed there. 350 * The process will continue running after this function returns. 351 * 352 * <p>If processes are not enabled, a new thread in the caller's 353 * process is created and main() of <var>processClass</var> called there. 354 * 355 * <p>The niceName parameter, if not an empty string, is a custom name to 356 * give to the process instead of using processClass. This allows you to 357 * make easily identifyable processes even if you are using the same base 358 * <var>processClass</var> to start them. 359 * 360 * @param processClass The class to use as the process's main entry 361 * point. 362 * @param niceName A more readable name to use for the process. 363 * @param uid The user-id under which the process will run. 364 * @param gid The group-id under which the process will run. 365 * @param gids Additional group-ids associated with the process. 366 * @param debugFlags Additional flags. 367 * @param targetSdkVersion The target SDK version for the app. 368 * @param seInfo null-ok SE Android information for the new process. 369 * @param zygoteArgs Additional arguments to supply to the zygote process. 370 * 371 * @return An object that describes the result of the attempt to start the process. 372 * @throws RuntimeException on fatal start failure 373 * 374 * {@hide} 375 */ 376 public static final ProcessStartResult start(final String processClass, 377 final String niceName, 378 int uid, int gid, int[] gids, 379 int debugFlags, int mountExternal, 380 int targetSdkVersion, 381 String seInfo, 382 String[] zygoteArgs) { 383 try { 384 return startViaZygote(processClass, niceName, uid, gid, gids, 385 debugFlags, mountExternal, targetSdkVersion, seInfo, zygoteArgs); 386 } catch (ZygoteStartFailedEx ex) { 387 Log.e(LOG_TAG, 388 "Starting VM process through Zygote failed"); 389 throw new RuntimeException( 390 "Starting VM process through Zygote failed", ex); 391 } 392 } 393 394 /** retry interval for opening a zygote socket */ 395 static final int ZYGOTE_RETRY_MILLIS = 500; 396 397 /** 398 * Tries to open socket to Zygote process if not already open. If 399 * already open, does nothing. May block and retry. 400 */ 401 private static void openZygoteSocketIfNeeded() 402 throws ZygoteStartFailedEx { 403 404 int retryCount; 405 406 if (sPreviousZygoteOpenFailed) { 407 /* 408 * If we've failed before, expect that we'll fail again and 409 * don't pause for retries. 410 */ 411 retryCount = 0; 412 } else { 413 retryCount = 10; 414 } 415 416 /* 417 * See bug #811181: Sometimes runtime can make it up before zygote. 418 * Really, we'd like to do something better to avoid this condition, 419 * but for now just wait a bit... 420 */ 421 for (int retry = 0 422 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 423 ; retry++ ) { 424 425 if (retry > 0) { 426 try { 427 Log.i("Zygote", "Zygote not up yet, sleeping..."); 428 Thread.sleep(ZYGOTE_RETRY_MILLIS); 429 } catch (InterruptedException ex) { 430 // should never happen 431 } 432 } 433 434 try { 435 sZygoteSocket = new LocalSocket(); 436 437 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 438 LocalSocketAddress.Namespace.RESERVED)); 439 440 sZygoteInputStream 441 = new DataInputStream(sZygoteSocket.getInputStream()); 442 443 sZygoteWriter = 444 new BufferedWriter( 445 new OutputStreamWriter( 446 sZygoteSocket.getOutputStream()), 447 256); 448 449 Log.i("Zygote", "Process: zygote socket opened"); 450 451 sPreviousZygoteOpenFailed = false; 452 break; 453 } catch (IOException ex) { 454 if (sZygoteSocket != null) { 455 try { 456 sZygoteSocket.close(); 457 } catch (IOException ex2) { 458 Log.e(LOG_TAG,"I/O exception on close after exception", 459 ex2); 460 } 461 } 462 463 sZygoteSocket = null; 464 } 465 } 466 467 if (sZygoteSocket == null) { 468 sPreviousZygoteOpenFailed = true; 469 throw new ZygoteStartFailedEx("connect failed"); 470 } 471 } 472 473 /** 474 * Sends an argument list to the zygote process, which starts a new child 475 * and returns the child's pid. Please note: the present implementation 476 * replaces newlines in the argument list with spaces. 477 * @param args argument list 478 * @return An object that describes the result of the attempt to start the process. 479 * @throws ZygoteStartFailedEx if process start failed for any reason 480 */ 481 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 482 throws ZygoteStartFailedEx { 483 openZygoteSocketIfNeeded(); 484 485 try { 486 /** 487 * See com.android.internal.os.ZygoteInit.readArgumentList() 488 * Presently the wire format to the zygote process is: 489 * a) a count of arguments (argc, in essence) 490 * b) a number of newline-separated argument strings equal to count 491 * 492 * After the zygote process reads these it will write the pid of 493 * the child or -1 on failure, followed by boolean to 494 * indicate whether a wrapper process was used. 495 */ 496 497 sZygoteWriter.write(Integer.toString(args.size())); 498 sZygoteWriter.newLine(); 499 500 int sz = args.size(); 501 for (int i = 0; i < sz; i++) { 502 String arg = args.get(i); 503 if (arg.indexOf('\n') >= 0) { 504 throw new ZygoteStartFailedEx( 505 "embedded newlines not allowed"); 506 } 507 sZygoteWriter.write(arg); 508 sZygoteWriter.newLine(); 509 } 510 511 sZygoteWriter.flush(); 512 513 // Should there be a timeout on this? 514 ProcessStartResult result = new ProcessStartResult(); 515 result.pid = sZygoteInputStream.readInt(); 516 if (result.pid < 0) { 517 throw new ZygoteStartFailedEx("fork() failed"); 518 } 519 result.usingWrapper = sZygoteInputStream.readBoolean(); 520 return result; 521 } catch (IOException ex) { 522 try { 523 if (sZygoteSocket != null) { 524 sZygoteSocket.close(); 525 } 526 } catch (IOException ex2) { 527 // we're going to fail anyway 528 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 529 } 530 531 sZygoteSocket = null; 532 533 throw new ZygoteStartFailedEx(ex); 534 } 535 } 536 537 /** 538 * Starts a new process via the zygote mechanism. 539 * 540 * @param processClass Class name whose static main() to run 541 * @param niceName 'nice' process name to appear in ps 542 * @param uid a POSIX uid that the new process should setuid() to 543 * @param gid a POSIX gid that the new process shuold setgid() to 544 * @param gids null-ok; a list of supplementary group IDs that the 545 * new process should setgroup() to. 546 * @param debugFlags Additional flags. 547 * @param targetSdkVersion The target SDK version for the app. 548 * @param seInfo null-ok SE Android information for the new process. 549 * @param extraArgs Additional arguments to supply to the zygote process. 550 * @return An object that describes the result of the attempt to start the process. 551 * @throws ZygoteStartFailedEx if process start failed for any reason 552 */ 553 private static ProcessStartResult startViaZygote(final String processClass, 554 final String niceName, 555 final int uid, final int gid, 556 final int[] gids, 557 int debugFlags, int mountExternal, 558 int targetSdkVersion, 559 String seInfo, 560 String[] extraArgs) 561 throws ZygoteStartFailedEx { 562 synchronized(Process.class) { 563 ArrayList<String> argsForZygote = new ArrayList<String>(); 564 565 // --runtime-init, --setuid=, --setgid=, 566 // and --setgroups= must go first 567 argsForZygote.add("--runtime-init"); 568 argsForZygote.add("--setuid=" + uid); 569 argsForZygote.add("--setgid=" + gid); 570 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 571 argsForZygote.add("--enable-jni-logging"); 572 } 573 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 574 argsForZygote.add("--enable-safemode"); 575 } 576 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 577 argsForZygote.add("--enable-debugger"); 578 } 579 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 580 argsForZygote.add("--enable-checkjni"); 581 } 582 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 583 argsForZygote.add("--enable-assert"); 584 } 585 if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER) { 586 argsForZygote.add("--mount-external-multiuser"); 587 } 588 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 589 590 //TODO optionally enable debuger 591 //argsForZygote.add("--enable-debugger"); 592 593 // --setgroups is a comma-separated list 594 if (gids != null && gids.length > 0) { 595 StringBuilder sb = new StringBuilder(); 596 sb.append("--setgroups="); 597 598 int sz = gids.length; 599 for (int i = 0; i < sz; i++) { 600 if (i != 0) { 601 sb.append(','); 602 } 603 sb.append(gids[i]); 604 } 605 606 argsForZygote.add(sb.toString()); 607 } 608 609 if (niceName != null) { 610 argsForZygote.add("--nice-name=" + niceName); 611 } 612 613 if (seInfo != null) { 614 argsForZygote.add("--seinfo=" + seInfo); 615 } 616 617 argsForZygote.add(processClass); 618 619 if (extraArgs != null) { 620 for (String arg : extraArgs) { 621 argsForZygote.add(arg); 622 } 623 } 624 625 return zygoteSendArgsAndGetResult(argsForZygote); 626 } 627 } 628 629 /** 630 * Returns elapsed milliseconds of the time this process has run. 631 * @return Returns the number of milliseconds this process has return. 632 */ 633 public static final native long getElapsedCpuTime(); 634 635 /** 636 * Returns the identifier of this process, which can be used with 637 * {@link #killProcess} and {@link #sendSignal}. 638 */ 639 public static final native int myPid(); 640 641 /** 642 * Returns the identifier of the calling thread, which be used with 643 * {@link #setThreadPriority(int, int)}. 644 */ 645 public static final native int myTid(); 646 647 /** 648 * Returns the identifier of this process's uid. This is the kernel uid 649 * that the process is running under, which is the identity of its 650 * app-specific sandbox. It is different from {@link #myUserHandle} in that 651 * a uid identifies a specific app sandbox in a specific user. 652 */ 653 public static final native int myUid(); 654 655 /** 656 * Returns this process's user handle. This is the 657 * user the process is running under. It is distinct from 658 * {@link #myUid()} in that a particular user will have multiple 659 * distinct apps running under it each with their own uid. 660 */ 661 public static final UserHandle myUserHandle() { 662 return new UserHandle(UserHandle.getUserId(myUid())); 663 } 664 665 /** 666 * Returns whether the current process is in an isolated sandbox. 667 * @hide 668 */ 669 public static final boolean isIsolated() { 670 int uid = UserHandle.getAppId(myUid()); 671 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 672 } 673 674 /** 675 * Returns the UID assigned to a particular user name, or -1 if there is 676 * none. If the given string consists of only numbers, it is converted 677 * directly to a uid. 678 */ 679 public static final native int getUidForName(String name); 680 681 /** 682 * Returns the GID assigned to a particular user name, or -1 if there is 683 * none. If the given string consists of only numbers, it is converted 684 * directly to a gid. 685 */ 686 public static final native int getGidForName(String name); 687 688 /** 689 * Returns a uid for a currently running process. 690 * @param pid the process id 691 * @return the uid of the process, or -1 if the process is not running. 692 * @hide pending API council review 693 */ 694 public static final int getUidForPid(int pid) { 695 String[] procStatusLabels = { "Uid:" }; 696 long[] procStatusValues = new long[1]; 697 procStatusValues[0] = -1; 698 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 699 return (int) procStatusValues[0]; 700 } 701 702 /** 703 * Returns the parent process id for a currently running process. 704 * @param pid the process id 705 * @return the parent process id of the process, or -1 if the process is not running. 706 * @hide 707 */ 708 public static final int getParentPid(int pid) { 709 String[] procStatusLabels = { "PPid:" }; 710 long[] procStatusValues = new long[1]; 711 procStatusValues[0] = -1; 712 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 713 return (int) procStatusValues[0]; 714 } 715 716 /** 717 * Returns the thread group leader id for a currently running thread. 718 * @param tid the thread id 719 * @return the thread group leader id of the thread, or -1 if the thread is not running. 720 * This is same as what getpid(2) would return if called by tid. 721 * @hide 722 */ 723 public static final int getThreadGroupLeader(int tid) { 724 String[] procStatusLabels = { "Tgid:" }; 725 long[] procStatusValues = new long[1]; 726 procStatusValues[0] = -1; 727 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 728 return (int) procStatusValues[0]; 729 } 730 731 /** 732 * Set the priority of a thread, based on Linux priorities. 733 * 734 * @param tid The identifier of the thread/process to change. 735 * @param priority A Linux priority level, from -20 for highest scheduling 736 * priority to 19 for lowest scheduling priority. 737 * 738 * @throws IllegalArgumentException Throws IllegalArgumentException if 739 * <var>tid</var> does not exist. 740 * @throws SecurityException Throws SecurityException if your process does 741 * not have permission to modify the given thread, or to use the given 742 * priority. 743 */ 744 public static final native void setThreadPriority(int tid, int priority) 745 throws IllegalArgumentException, SecurityException; 746 747 /** 748 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 749 * throw an exception if passed a background-level thread priority. This is only 750 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 751 * 752 * @hide 753 */ 754 public static final native void setCanSelfBackground(boolean backgroundOk); 755 756 /** 757 * Sets the scheduling group for a thread. 758 * @hide 759 * @param tid The identifier of the thread to change. 760 * @param group The target group for this thread from THREAD_GROUP_*. 761 * 762 * @throws IllegalArgumentException Throws IllegalArgumentException if 763 * <var>tid</var> does not exist. 764 * @throws SecurityException Throws SecurityException if your process does 765 * not have permission to modify the given thread, or to use the given 766 * priority. 767 * If the thread is a thread group leader, that is it's gettid() == getpid(), 768 * then the other threads in the same thread group are _not_ affected. 769 */ 770 public static final native void setThreadGroup(int tid, int group) 771 throws IllegalArgumentException, SecurityException; 772 773 /** 774 * Sets the scheduling group for a process and all child threads 775 * @hide 776 * @param pid The identifier of the process to change. 777 * @param group The target group for this process from THREAD_GROUP_*. 778 * 779 * @throws IllegalArgumentException Throws IllegalArgumentException if 780 * <var>tid</var> does not exist. 781 * @throws SecurityException Throws SecurityException if your process does 782 * not have permission to modify the given thread, or to use the given 783 * priority. 784 * 785 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 786 * threads to the foreground scheduling group, but to leave background 787 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 788 * threads, regardless of priority, to the background scheduling group. 789 * group == THREAD_GROUP_FOREGROUND is not allowed. 790 */ 791 public static final native void setProcessGroup(int pid, int group) 792 throws IllegalArgumentException, SecurityException; 793 794 /** 795 * Set the priority of the calling thread, based on Linux priorities. See 796 * {@link #setThreadPriority(int, int)} for more information. 797 * 798 * @param priority A Linux priority level, from -20 for highest scheduling 799 * priority to 19 for lowest scheduling priority. 800 * 801 * @throws IllegalArgumentException Throws IllegalArgumentException if 802 * <var>tid</var> does not exist. 803 * @throws SecurityException Throws SecurityException if your process does 804 * not have permission to modify the given thread, or to use the given 805 * priority. 806 * 807 * @see #setThreadPriority(int, int) 808 */ 809 public static final native void setThreadPriority(int priority) 810 throws IllegalArgumentException, SecurityException; 811 812 /** 813 * Return the current priority of a thread, based on Linux priorities. 814 * 815 * @param tid The identifier of the thread/process to change. 816 * 817 * @return Returns the current priority, as a Linux priority level, 818 * from -20 for highest scheduling priority to 19 for lowest scheduling 819 * priority. 820 * 821 * @throws IllegalArgumentException Throws IllegalArgumentException if 822 * <var>tid</var> does not exist. 823 */ 824 public static final native int getThreadPriority(int tid) 825 throws IllegalArgumentException; 826 827 /** 828 * Set the scheduling policy and priority of a thread, based on Linux. 829 * 830 * @param tid The identifier of the thread/process to change. 831 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 832 * @param priority A Linux priority level in a range appropriate for the given policy. 833 * 834 * @throws IllegalArgumentException Throws IllegalArgumentException if 835 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 836 * @throws SecurityException Throws SecurityException if your process does 837 * not have permission to modify the given thread, or to use the given 838 * scheduling policy or priority. 839 * 840 * {@hide} 841 */ 842 public static final native void setThreadScheduler(int tid, int policy, int priority) 843 throws IllegalArgumentException; 844 845 /** 846 * Determine whether the current environment supports multiple processes. 847 * 848 * @return Returns true if the system can run in multiple processes, else 849 * false if everything is running in a single process. 850 * 851 * @deprecated This method always returns true. Do not use. 852 */ 853 @Deprecated 854 public static final boolean supportsProcesses() { 855 return true; 856 } 857 858 /** 859 * Set the out-of-memory badness adjustment for a process. 860 * 861 * @param pid The process identifier to set. 862 * @param amt Adjustment value -- linux allows -16 to +15. 863 * 864 * @return Returns true if the underlying system supports this 865 * feature, else false. 866 * 867 * {@hide} 868 */ 869 public static final native boolean setOomAdj(int pid, int amt); 870 871 /** 872 * Change this process's argv[0] parameter. This can be useful to show 873 * more descriptive information in things like the 'ps' command. 874 * 875 * @param text The new name of this process. 876 * 877 * {@hide} 878 */ 879 public static final native void setArgV0(String text); 880 881 /** 882 * Kill the process with the given PID. 883 * Note that, though this API allows us to request to 884 * kill any process based on its PID, the kernel will 885 * still impose standard restrictions on which PIDs you 886 * are actually able to kill. Typically this means only 887 * the process running the caller's packages/application 888 * and any additional processes created by that app; packages 889 * sharing a common UID will also be able to kill each 890 * other's processes. 891 */ 892 public static final void killProcess(int pid) { 893 sendSignal(pid, SIGNAL_KILL); 894 } 895 896 /** @hide */ 897 public static final native int setUid(int uid); 898 899 /** @hide */ 900 public static final native int setGid(int uid); 901 902 /** 903 * Send a signal to the given process. 904 * 905 * @param pid The pid of the target process. 906 * @param signal The signal to send. 907 */ 908 public static final native void sendSignal(int pid, int signal); 909 910 /** 911 * @hide 912 * Private impl for avoiding a log message... DO NOT USE without doing 913 * your own log, or the Android Illuminati will find you some night and 914 * beat you up. 915 */ 916 public static final void killProcessQuiet(int pid) { 917 sendSignalQuiet(pid, SIGNAL_KILL); 918 } 919 920 /** 921 * @hide 922 * Private impl for avoiding a log message... DO NOT USE without doing 923 * your own log, or the Android Illuminati will find you some night and 924 * beat you up. 925 */ 926 public static final native void sendSignalQuiet(int pid, int signal); 927 928 /** @hide */ 929 public static final native long getFreeMemory(); 930 931 /** @hide */ 932 public static final native long getTotalMemory(); 933 934 /** @hide */ 935 public static final native void readProcLines(String path, 936 String[] reqFields, long[] outSizes); 937 938 /** @hide */ 939 public static final native int[] getPids(String path, int[] lastArray); 940 941 /** @hide */ 942 public static final int PROC_TERM_MASK = 0xff; 943 /** @hide */ 944 public static final int PROC_ZERO_TERM = 0; 945 /** @hide */ 946 public static final int PROC_SPACE_TERM = (int)' '; 947 /** @hide */ 948 public static final int PROC_TAB_TERM = (int)'\t'; 949 /** @hide */ 950 public static final int PROC_COMBINE = 0x100; 951 /** @hide */ 952 public static final int PROC_PARENS = 0x200; 953 /** @hide */ 954 public static final int PROC_OUT_STRING = 0x1000; 955 /** @hide */ 956 public static final int PROC_OUT_LONG = 0x2000; 957 /** @hide */ 958 public static final int PROC_OUT_FLOAT = 0x4000; 959 960 /** @hide */ 961 public static final native boolean readProcFile(String file, int[] format, 962 String[] outStrings, long[] outLongs, float[] outFloats); 963 964 /** @hide */ 965 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 966 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 967 968 /** @hide */ 969 public static final native int[] getPidsForCommands(String[] cmds); 970 971 /** 972 * Gets the total Pss value for a given process, in bytes. 973 * 974 * @param pid the process to the Pss for 975 * @return the total Pss value for the given process in bytes, 976 * or -1 if the value cannot be determined 977 * @hide 978 */ 979 public static final native long getPss(int pid); 980 981 /** 982 * Specifies the outcome of having started a process. 983 * @hide 984 */ 985 public static final class ProcessStartResult { 986 /** 987 * The PID of the newly started process. 988 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 989 */ 990 public int pid; 991 992 /** 993 * True if the process was started with a wrapper attached. 994 */ 995 public boolean usingWrapper; 996 } 997} 998