Process.java revision 1abb1cb3a8fe17f7866150604c2fd73751da787e
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 targetSdkVersion, 380 String seInfo, 381 String[] zygoteArgs) { 382 try { 383 return startViaZygote(processClass, niceName, uid, gid, gids, 384 debugFlags, targetSdkVersion, seInfo, zygoteArgs); 385 } catch (ZygoteStartFailedEx ex) { 386 Log.e(LOG_TAG, 387 "Starting VM process through Zygote failed"); 388 throw new RuntimeException( 389 "Starting VM process through Zygote failed", ex); 390 } 391 } 392 393 /** retry interval for opening a zygote socket */ 394 static final int ZYGOTE_RETRY_MILLIS = 500; 395 396 /** 397 * Tries to open socket to Zygote process if not already open. If 398 * already open, does nothing. May block and retry. 399 */ 400 private static void openZygoteSocketIfNeeded() 401 throws ZygoteStartFailedEx { 402 403 int retryCount; 404 405 if (sPreviousZygoteOpenFailed) { 406 /* 407 * If we've failed before, expect that we'll fail again and 408 * don't pause for retries. 409 */ 410 retryCount = 0; 411 } else { 412 retryCount = 10; 413 } 414 415 /* 416 * See bug #811181: Sometimes runtime can make it up before zygote. 417 * Really, we'd like to do something better to avoid this condition, 418 * but for now just wait a bit... 419 */ 420 for (int retry = 0 421 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 422 ; retry++ ) { 423 424 if (retry > 0) { 425 try { 426 Log.i("Zygote", "Zygote not up yet, sleeping..."); 427 Thread.sleep(ZYGOTE_RETRY_MILLIS); 428 } catch (InterruptedException ex) { 429 // should never happen 430 } 431 } 432 433 try { 434 sZygoteSocket = new LocalSocket(); 435 436 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 437 LocalSocketAddress.Namespace.RESERVED)); 438 439 sZygoteInputStream 440 = new DataInputStream(sZygoteSocket.getInputStream()); 441 442 sZygoteWriter = 443 new BufferedWriter( 444 new OutputStreamWriter( 445 sZygoteSocket.getOutputStream()), 446 256); 447 448 Log.i("Zygote", "Process: zygote socket opened"); 449 450 sPreviousZygoteOpenFailed = false; 451 break; 452 } catch (IOException ex) { 453 if (sZygoteSocket != null) { 454 try { 455 sZygoteSocket.close(); 456 } catch (IOException ex2) { 457 Log.e(LOG_TAG,"I/O exception on close after exception", 458 ex2); 459 } 460 } 461 462 sZygoteSocket = null; 463 } 464 } 465 466 if (sZygoteSocket == null) { 467 sPreviousZygoteOpenFailed = true; 468 throw new ZygoteStartFailedEx("connect failed"); 469 } 470 } 471 472 /** 473 * Sends an argument list to the zygote process, which starts a new child 474 * and returns the child's pid. Please note: the present implementation 475 * replaces newlines in the argument list with spaces. 476 * @param args argument list 477 * @return An object that describes the result of the attempt to start the process. 478 * @throws ZygoteStartFailedEx if process start failed for any reason 479 */ 480 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 481 throws ZygoteStartFailedEx { 482 openZygoteSocketIfNeeded(); 483 484 try { 485 /** 486 * See com.android.internal.os.ZygoteInit.readArgumentList() 487 * Presently the wire format to the zygote process is: 488 * a) a count of arguments (argc, in essence) 489 * b) a number of newline-separated argument strings equal to count 490 * 491 * After the zygote process reads these it will write the pid of 492 * the child or -1 on failure, followed by boolean to 493 * indicate whether a wrapper process was used. 494 */ 495 496 sZygoteWriter.write(Integer.toString(args.size())); 497 sZygoteWriter.newLine(); 498 499 int sz = args.size(); 500 for (int i = 0; i < sz; i++) { 501 String arg = args.get(i); 502 if (arg.indexOf('\n') >= 0) { 503 throw new ZygoteStartFailedEx( 504 "embedded newlines not allowed"); 505 } 506 sZygoteWriter.write(arg); 507 sZygoteWriter.newLine(); 508 } 509 510 sZygoteWriter.flush(); 511 512 // Should there be a timeout on this? 513 ProcessStartResult result = new ProcessStartResult(); 514 result.pid = sZygoteInputStream.readInt(); 515 if (result.pid < 0) { 516 throw new ZygoteStartFailedEx("fork() failed"); 517 } 518 result.usingWrapper = sZygoteInputStream.readBoolean(); 519 return result; 520 } catch (IOException ex) { 521 try { 522 if (sZygoteSocket != null) { 523 sZygoteSocket.close(); 524 } 525 } catch (IOException ex2) { 526 // we're going to fail anyway 527 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 528 } 529 530 sZygoteSocket = null; 531 532 throw new ZygoteStartFailedEx(ex); 533 } 534 } 535 536 /** 537 * Starts a new process via the zygote mechanism. 538 * 539 * @param processClass Class name whose static main() to run 540 * @param niceName 'nice' process name to appear in ps 541 * @param uid a POSIX uid that the new process should setuid() to 542 * @param gid a POSIX gid that the new process shuold setgid() to 543 * @param gids null-ok; a list of supplementary group IDs that the 544 * new process should setgroup() to. 545 * @param debugFlags Additional flags. 546 * @param targetSdkVersion The target SDK version for the app. 547 * @param seInfo null-ok SE Android information for the new process. 548 * @param extraArgs Additional arguments to supply to the zygote process. 549 * @return An object that describes the result of the attempt to start the process. 550 * @throws ZygoteStartFailedEx if process start failed for any reason 551 */ 552 private static ProcessStartResult startViaZygote(final String processClass, 553 final String niceName, 554 final int uid, final int gid, 555 final int[] gids, 556 int debugFlags, int targetSdkVersion, 557 String seInfo, 558 String[] extraArgs) 559 throws ZygoteStartFailedEx { 560 synchronized(Process.class) { 561 ArrayList<String> argsForZygote = new ArrayList<String>(); 562 563 // --runtime-init, --setuid=, --setgid=, 564 // and --setgroups= must go first 565 argsForZygote.add("--runtime-init"); 566 argsForZygote.add("--setuid=" + uid); 567 argsForZygote.add("--setgid=" + gid); 568 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 569 argsForZygote.add("--enable-jni-logging"); 570 } 571 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 572 argsForZygote.add("--enable-safemode"); 573 } 574 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 575 argsForZygote.add("--enable-debugger"); 576 } 577 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 578 argsForZygote.add("--enable-checkjni"); 579 } 580 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 581 argsForZygote.add("--enable-assert"); 582 } 583 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 584 585 //TODO optionally enable debuger 586 //argsForZygote.add("--enable-debugger"); 587 588 // --setgroups is a comma-separated list 589 if (gids != null && gids.length > 0) { 590 StringBuilder sb = new StringBuilder(); 591 sb.append("--setgroups="); 592 593 int sz = gids.length; 594 for (int i = 0; i < sz; i++) { 595 if (i != 0) { 596 sb.append(','); 597 } 598 sb.append(gids[i]); 599 } 600 601 argsForZygote.add(sb.toString()); 602 } 603 604 if (niceName != null) { 605 argsForZygote.add("--nice-name=" + niceName); 606 } 607 608 if (seInfo != null) { 609 argsForZygote.add("--seinfo=" + seInfo); 610 } 611 612 argsForZygote.add(processClass); 613 614 if (extraArgs != null) { 615 for (String arg : extraArgs) { 616 argsForZygote.add(arg); 617 } 618 } 619 620 return zygoteSendArgsAndGetResult(argsForZygote); 621 } 622 } 623 624 /** 625 * Returns elapsed milliseconds of the time this process has run. 626 * @return Returns the number of milliseconds this process has return. 627 */ 628 public static final native long getElapsedCpuTime(); 629 630 /** 631 * Returns the identifier of this process, which can be used with 632 * {@link #killProcess} and {@link #sendSignal}. 633 */ 634 public static final native int myPid(); 635 636 /** 637 * Returns the identifier of the calling thread, which be used with 638 * {@link #setThreadPriority(int, int)}. 639 */ 640 public static final native int myTid(); 641 642 /** 643 * Returns the identifier of this process's user. 644 */ 645 public static final native int myUid(); 646 647 /** 648 * Returns whether the current process is in an isolated sandbox. 649 * @hide 650 */ 651 public static final boolean isIsolated() { 652 int uid = UserId.getAppId(myUid()); 653 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 654 } 655 656 /** 657 * Returns the UID assigned to a particular user name, or -1 if there is 658 * none. If the given string consists of only numbers, it is converted 659 * directly to a uid. 660 */ 661 public static final native int getUidForName(String name); 662 663 /** 664 * Returns the GID assigned to a particular user name, or -1 if there is 665 * none. If the given string consists of only numbers, it is converted 666 * directly to a gid. 667 */ 668 public static final native int getGidForName(String name); 669 670 /** 671 * Returns a uid for a currently running process. 672 * @param pid the process id 673 * @return the uid of the process, or -1 if the process is not running. 674 * @hide pending API council review 675 */ 676 public static final int getUidForPid(int pid) { 677 String[] procStatusLabels = { "Uid:" }; 678 long[] procStatusValues = new long[1]; 679 procStatusValues[0] = -1; 680 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 681 return (int) procStatusValues[0]; 682 } 683 684 /** 685 * Returns the parent process id for a currently running process. 686 * @param pid the process id 687 * @return the parent process id of the process, or -1 if the process is not running. 688 * @hide 689 */ 690 public static final int getParentPid(int pid) { 691 String[] procStatusLabels = { "PPid:" }; 692 long[] procStatusValues = new long[1]; 693 procStatusValues[0] = -1; 694 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 695 return (int) procStatusValues[0]; 696 } 697 698 /** 699 * Returns the thread group leader id for a currently running thread. 700 * @param tid the thread id 701 * @return the thread group leader id of the thread, or -1 if the thread is not running. 702 * This is same as what getpid(2) would return if called by tid. 703 * @hide 704 */ 705 public static final int getThreadGroupLeader(int tid) { 706 String[] procStatusLabels = { "Tgid:" }; 707 long[] procStatusValues = new long[1]; 708 procStatusValues[0] = -1; 709 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 710 return (int) procStatusValues[0]; 711 } 712 713 /** 714 * Set the priority of a thread, based on Linux priorities. 715 * 716 * @param tid The identifier of the thread/process to change. 717 * @param priority A Linux priority level, from -20 for highest scheduling 718 * priority to 19 for lowest scheduling priority. 719 * 720 * @throws IllegalArgumentException Throws IllegalArgumentException if 721 * <var>tid</var> does not exist. 722 * @throws SecurityException Throws SecurityException if your process does 723 * not have permission to modify the given thread, or to use the given 724 * priority. 725 */ 726 public static final native void setThreadPriority(int tid, int priority) 727 throws IllegalArgumentException, SecurityException; 728 729 /** 730 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 731 * throw an exception if passed a background-level thread priority. This is only 732 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 733 * 734 * @hide 735 */ 736 public static final native void setCanSelfBackground(boolean backgroundOk); 737 738 /** 739 * Sets the scheduling group for a thread. 740 * @hide 741 * @param tid The identifier of the thread to change. 742 * @param group The target group for this thread from THREAD_GROUP_*. 743 * 744 * @throws IllegalArgumentException Throws IllegalArgumentException if 745 * <var>tid</var> does not exist. 746 * @throws SecurityException Throws SecurityException if your process does 747 * not have permission to modify the given thread, or to use the given 748 * priority. 749 * If the thread is a thread group leader, that is it's gettid() == getpid(), 750 * then the other threads in the same thread group are _not_ affected. 751 */ 752 public static final native void setThreadGroup(int tid, int group) 753 throws IllegalArgumentException, SecurityException; 754 755 /** 756 * Sets the scheduling group for a process and all child threads 757 * @hide 758 * @param pid The identifier of the process to change. 759 * @param group The target group for this process from THREAD_GROUP_*. 760 * 761 * @throws IllegalArgumentException Throws IllegalArgumentException if 762 * <var>tid</var> does not exist. 763 * @throws SecurityException Throws SecurityException if your process does 764 * not have permission to modify the given thread, or to use the given 765 * priority. 766 * 767 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 768 * threads to the foreground scheduling group, but to leave background 769 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 770 * threads, regardless of priority, to the background scheduling group. 771 * group == THREAD_GROUP_FOREGROUND is not allowed. 772 */ 773 public static final native void setProcessGroup(int pid, int group) 774 throws IllegalArgumentException, SecurityException; 775 776 /** 777 * Set the priority of the calling thread, based on Linux priorities. See 778 * {@link #setThreadPriority(int, int)} for more information. 779 * 780 * @param priority A Linux priority level, from -20 for highest scheduling 781 * priority to 19 for lowest scheduling priority. 782 * 783 * @throws IllegalArgumentException Throws IllegalArgumentException if 784 * <var>tid</var> does not exist. 785 * @throws SecurityException Throws SecurityException if your process does 786 * not have permission to modify the given thread, or to use the given 787 * priority. 788 * 789 * @see #setThreadPriority(int, int) 790 */ 791 public static final native void setThreadPriority(int priority) 792 throws IllegalArgumentException, SecurityException; 793 794 /** 795 * Return the current priority of a thread, based on Linux priorities. 796 * 797 * @param tid The identifier of the thread/process to change. 798 * 799 * @return Returns the current priority, as a Linux priority level, 800 * from -20 for highest scheduling priority to 19 for lowest scheduling 801 * priority. 802 * 803 * @throws IllegalArgumentException Throws IllegalArgumentException if 804 * <var>tid</var> does not exist. 805 */ 806 public static final native int getThreadPriority(int tid) 807 throws IllegalArgumentException; 808 809 /** 810 * Set the scheduling policy and priority of a thread, based on Linux. 811 * 812 * @param tid The identifier of the thread/process to change. 813 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 814 * @param priority A Linux priority level in a range appropriate for the given policy. 815 * 816 * @throws IllegalArgumentException Throws IllegalArgumentException if 817 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 818 * @throws SecurityException Throws SecurityException if your process does 819 * not have permission to modify the given thread, or to use the given 820 * scheduling policy or priority. 821 * 822 * {@hide} 823 */ 824 public static final native void setThreadScheduler(int tid, int policy, int priority) 825 throws IllegalArgumentException; 826 827 /** 828 * Determine whether the current environment supports multiple processes. 829 * 830 * @return Returns true if the system can run in multiple processes, else 831 * false if everything is running in a single process. 832 * 833 * @deprecated This method always returns true. Do not use. 834 */ 835 @Deprecated 836 public static final boolean supportsProcesses() { 837 return true; 838 } 839 840 /** 841 * Set the out-of-memory badness adjustment for a process. 842 * 843 * @param pid The process identifier to set. 844 * @param amt Adjustment value -- linux allows -16 to +15. 845 * 846 * @return Returns true if the underlying system supports this 847 * feature, else false. 848 * 849 * {@hide} 850 */ 851 public static final native boolean setOomAdj(int pid, int amt); 852 853 /** 854 * Change this process's argv[0] parameter. This can be useful to show 855 * more descriptive information in things like the 'ps' command. 856 * 857 * @param text The new name of this process. 858 * 859 * {@hide} 860 */ 861 public static final native void setArgV0(String text); 862 863 /** 864 * Kill the process with the given PID. 865 * Note that, though this API allows us to request to 866 * kill any process based on its PID, the kernel will 867 * still impose standard restrictions on which PIDs you 868 * are actually able to kill. Typically this means only 869 * the process running the caller's packages/application 870 * and any additional processes created by that app; packages 871 * sharing a common UID will also be able to kill each 872 * other's processes. 873 */ 874 public static final void killProcess(int pid) { 875 sendSignal(pid, SIGNAL_KILL); 876 } 877 878 /** @hide */ 879 public static final native int setUid(int uid); 880 881 /** @hide */ 882 public static final native int setGid(int uid); 883 884 /** 885 * Send a signal to the given process. 886 * 887 * @param pid The pid of the target process. 888 * @param signal The signal to send. 889 */ 890 public static final native void sendSignal(int pid, int signal); 891 892 /** 893 * @hide 894 * Private impl for avoiding a log message... DO NOT USE without doing 895 * your own log, or the Android Illuminati will find you some night and 896 * beat you up. 897 */ 898 public static final void killProcessQuiet(int pid) { 899 sendSignalQuiet(pid, SIGNAL_KILL); 900 } 901 902 /** 903 * @hide 904 * Private impl for avoiding a log message... DO NOT USE without doing 905 * your own log, or the Android Illuminati will find you some night and 906 * beat you up. 907 */ 908 public static final native void sendSignalQuiet(int pid, int signal); 909 910 /** @hide */ 911 public static final native long getFreeMemory(); 912 913 /** @hide */ 914 public static final native long getTotalMemory(); 915 916 /** @hide */ 917 public static final native void readProcLines(String path, 918 String[] reqFields, long[] outSizes); 919 920 /** @hide */ 921 public static final native int[] getPids(String path, int[] lastArray); 922 923 /** @hide */ 924 public static final int PROC_TERM_MASK = 0xff; 925 /** @hide */ 926 public static final int PROC_ZERO_TERM = 0; 927 /** @hide */ 928 public static final int PROC_SPACE_TERM = (int)' '; 929 /** @hide */ 930 public static final int PROC_TAB_TERM = (int)'\t'; 931 /** @hide */ 932 public static final int PROC_COMBINE = 0x100; 933 /** @hide */ 934 public static final int PROC_PARENS = 0x200; 935 /** @hide */ 936 public static final int PROC_OUT_STRING = 0x1000; 937 /** @hide */ 938 public static final int PROC_OUT_LONG = 0x2000; 939 /** @hide */ 940 public static final int PROC_OUT_FLOAT = 0x4000; 941 942 /** @hide */ 943 public static final native boolean readProcFile(String file, int[] format, 944 String[] outStrings, long[] outLongs, float[] outFloats); 945 946 /** @hide */ 947 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 948 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 949 950 /** @hide */ 951 public static final native int[] getPidsForCommands(String[] cmds); 952 953 /** 954 * Gets the total Pss value for a given process, in bytes. 955 * 956 * @param pid the process to the Pss for 957 * @return the total Pss value for the given process in bytes, 958 * or -1 if the value cannot be determined 959 * @hide 960 */ 961 public static final native long getPss(int pid); 962 963 /** 964 * Specifies the outcome of having started a process. 965 * @hide 966 */ 967 public static final class ProcessStartResult { 968 /** 969 * The PID of the newly started process. 970 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 971 */ 972 public int pid; 973 974 /** 975 * True if the process was started with a wrapper attached. 976 */ 977 public boolean usingWrapper; 978 } 979} 980