Process.java revision f02b60aa4f367516f40cf3d60fffae0c6fe3e1b8
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 uid. This is the kernel uid 644 * that the process is running under, which is the identity of its 645 * app-specific sandbox. It is different from {@link #myUserHandle} in that 646 * a uid identifies a specific app sandbox in a specific user. 647 */ 648 public static final native int myUid(); 649 650 /** 651 * Returns the identifier of this process's user handle. This is the 652 * user the process is running under. It is distinct from 653 * {@link #myUid()} in that a particular user will have multiple 654 * distinct apps running under it each with their own uid. 655 */ 656 public static final int myUserHandle() { 657 return UserHandle.getUserId(myUid()); 658 } 659 660 /** 661 * Returns whether the current process is in an isolated sandbox. 662 * @hide 663 */ 664 public static final boolean isIsolated() { 665 int uid = UserHandle.getAppId(myUid()); 666 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 667 } 668 669 /** 670 * Returns the UID assigned to a particular user name, or -1 if there is 671 * none. If the given string consists of only numbers, it is converted 672 * directly to a uid. 673 */ 674 public static final native int getUidForName(String name); 675 676 /** 677 * Returns the GID assigned to a particular user name, or -1 if there is 678 * none. If the given string consists of only numbers, it is converted 679 * directly to a gid. 680 */ 681 public static final native int getGidForName(String name); 682 683 /** 684 * Returns a uid for a currently running process. 685 * @param pid the process id 686 * @return the uid of the process, or -1 if the process is not running. 687 * @hide pending API council review 688 */ 689 public static final int getUidForPid(int pid) { 690 String[] procStatusLabels = { "Uid:" }; 691 long[] procStatusValues = new long[1]; 692 procStatusValues[0] = -1; 693 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 694 return (int) procStatusValues[0]; 695 } 696 697 /** 698 * Returns the parent process id for a currently running process. 699 * @param pid the process id 700 * @return the parent process id of the process, or -1 if the process is not running. 701 * @hide 702 */ 703 public static final int getParentPid(int pid) { 704 String[] procStatusLabels = { "PPid:" }; 705 long[] procStatusValues = new long[1]; 706 procStatusValues[0] = -1; 707 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 708 return (int) procStatusValues[0]; 709 } 710 711 /** 712 * Returns the thread group leader id for a currently running thread. 713 * @param tid the thread id 714 * @return the thread group leader id of the thread, or -1 if the thread is not running. 715 * This is same as what getpid(2) would return if called by tid. 716 * @hide 717 */ 718 public static final int getThreadGroupLeader(int tid) { 719 String[] procStatusLabels = { "Tgid:" }; 720 long[] procStatusValues = new long[1]; 721 procStatusValues[0] = -1; 722 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 723 return (int) procStatusValues[0]; 724 } 725 726 /** 727 * Set the priority of a thread, based on Linux priorities. 728 * 729 * @param tid The identifier of the thread/process to change. 730 * @param priority A Linux priority level, from -20 for highest scheduling 731 * priority to 19 for lowest scheduling priority. 732 * 733 * @throws IllegalArgumentException Throws IllegalArgumentException if 734 * <var>tid</var> does not exist. 735 * @throws SecurityException Throws SecurityException if your process does 736 * not have permission to modify the given thread, or to use the given 737 * priority. 738 */ 739 public static final native void setThreadPriority(int tid, int priority) 740 throws IllegalArgumentException, SecurityException; 741 742 /** 743 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 744 * throw an exception if passed a background-level thread priority. This is only 745 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 746 * 747 * @hide 748 */ 749 public static final native void setCanSelfBackground(boolean backgroundOk); 750 751 /** 752 * Sets the scheduling group for a thread. 753 * @hide 754 * @param tid The identifier of the thread to change. 755 * @param group The target group for this thread from THREAD_GROUP_*. 756 * 757 * @throws IllegalArgumentException Throws IllegalArgumentException if 758 * <var>tid</var> does not exist. 759 * @throws SecurityException Throws SecurityException if your process does 760 * not have permission to modify the given thread, or to use the given 761 * priority. 762 * If the thread is a thread group leader, that is it's gettid() == getpid(), 763 * then the other threads in the same thread group are _not_ affected. 764 */ 765 public static final native void setThreadGroup(int tid, int group) 766 throws IllegalArgumentException, SecurityException; 767 768 /** 769 * Sets the scheduling group for a process and all child threads 770 * @hide 771 * @param pid The identifier of the process to change. 772 * @param group The target group for this process from THREAD_GROUP_*. 773 * 774 * @throws IllegalArgumentException Throws IllegalArgumentException if 775 * <var>tid</var> does not exist. 776 * @throws SecurityException Throws SecurityException if your process does 777 * not have permission to modify the given thread, or to use the given 778 * priority. 779 * 780 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 781 * threads to the foreground scheduling group, but to leave background 782 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 783 * threads, regardless of priority, to the background scheduling group. 784 * group == THREAD_GROUP_FOREGROUND is not allowed. 785 */ 786 public static final native void setProcessGroup(int pid, int group) 787 throws IllegalArgumentException, SecurityException; 788 789 /** 790 * Set the priority of the calling thread, based on Linux priorities. See 791 * {@link #setThreadPriority(int, int)} for more information. 792 * 793 * @param priority A Linux priority level, from -20 for highest scheduling 794 * priority to 19 for lowest scheduling priority. 795 * 796 * @throws IllegalArgumentException Throws IllegalArgumentException if 797 * <var>tid</var> does not exist. 798 * @throws SecurityException Throws SecurityException if your process does 799 * not have permission to modify the given thread, or to use the given 800 * priority. 801 * 802 * @see #setThreadPriority(int, int) 803 */ 804 public static final native void setThreadPriority(int priority) 805 throws IllegalArgumentException, SecurityException; 806 807 /** 808 * Return the current priority of a thread, based on Linux priorities. 809 * 810 * @param tid The identifier of the thread/process to change. 811 * 812 * @return Returns the current priority, as a Linux priority level, 813 * from -20 for highest scheduling priority to 19 for lowest scheduling 814 * priority. 815 * 816 * @throws IllegalArgumentException Throws IllegalArgumentException if 817 * <var>tid</var> does not exist. 818 */ 819 public static final native int getThreadPriority(int tid) 820 throws IllegalArgumentException; 821 822 /** 823 * Set the scheduling policy and priority of a thread, based on Linux. 824 * 825 * @param tid The identifier of the thread/process to change. 826 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 827 * @param priority A Linux priority level in a range appropriate for the given policy. 828 * 829 * @throws IllegalArgumentException Throws IllegalArgumentException if 830 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 831 * @throws SecurityException Throws SecurityException if your process does 832 * not have permission to modify the given thread, or to use the given 833 * scheduling policy or priority. 834 * 835 * {@hide} 836 */ 837 public static final native void setThreadScheduler(int tid, int policy, int priority) 838 throws IllegalArgumentException; 839 840 /** 841 * Determine whether the current environment supports multiple processes. 842 * 843 * @return Returns true if the system can run in multiple processes, else 844 * false if everything is running in a single process. 845 * 846 * @deprecated This method always returns true. Do not use. 847 */ 848 @Deprecated 849 public static final boolean supportsProcesses() { 850 return true; 851 } 852 853 /** 854 * Set the out-of-memory badness adjustment for a process. 855 * 856 * @param pid The process identifier to set. 857 * @param amt Adjustment value -- linux allows -16 to +15. 858 * 859 * @return Returns true if the underlying system supports this 860 * feature, else false. 861 * 862 * {@hide} 863 */ 864 public static final native boolean setOomAdj(int pid, int amt); 865 866 /** 867 * Change this process's argv[0] parameter. This can be useful to show 868 * more descriptive information in things like the 'ps' command. 869 * 870 * @param text The new name of this process. 871 * 872 * {@hide} 873 */ 874 public static final native void setArgV0(String text); 875 876 /** 877 * Kill the process with the given PID. 878 * Note that, though this API allows us to request to 879 * kill any process based on its PID, the kernel will 880 * still impose standard restrictions on which PIDs you 881 * are actually able to kill. Typically this means only 882 * the process running the caller's packages/application 883 * and any additional processes created by that app; packages 884 * sharing a common UID will also be able to kill each 885 * other's processes. 886 */ 887 public static final void killProcess(int pid) { 888 sendSignal(pid, SIGNAL_KILL); 889 } 890 891 /** @hide */ 892 public static final native int setUid(int uid); 893 894 /** @hide */ 895 public static final native int setGid(int uid); 896 897 /** 898 * Send a signal to the given process. 899 * 900 * @param pid The pid of the target process. 901 * @param signal The signal to send. 902 */ 903 public static final native void sendSignal(int pid, int signal); 904 905 /** 906 * @hide 907 * Private impl for avoiding a log message... DO NOT USE without doing 908 * your own log, or the Android Illuminati will find you some night and 909 * beat you up. 910 */ 911 public static final void killProcessQuiet(int pid) { 912 sendSignalQuiet(pid, SIGNAL_KILL); 913 } 914 915 /** 916 * @hide 917 * Private impl for avoiding a log message... DO NOT USE without doing 918 * your own log, or the Android Illuminati will find you some night and 919 * beat you up. 920 */ 921 public static final native void sendSignalQuiet(int pid, int signal); 922 923 /** @hide */ 924 public static final native long getFreeMemory(); 925 926 /** @hide */ 927 public static final native long getTotalMemory(); 928 929 /** @hide */ 930 public static final native void readProcLines(String path, 931 String[] reqFields, long[] outSizes); 932 933 /** @hide */ 934 public static final native int[] getPids(String path, int[] lastArray); 935 936 /** @hide */ 937 public static final int PROC_TERM_MASK = 0xff; 938 /** @hide */ 939 public static final int PROC_ZERO_TERM = 0; 940 /** @hide */ 941 public static final int PROC_SPACE_TERM = (int)' '; 942 /** @hide */ 943 public static final int PROC_TAB_TERM = (int)'\t'; 944 /** @hide */ 945 public static final int PROC_COMBINE = 0x100; 946 /** @hide */ 947 public static final int PROC_PARENS = 0x200; 948 /** @hide */ 949 public static final int PROC_OUT_STRING = 0x1000; 950 /** @hide */ 951 public static final int PROC_OUT_LONG = 0x2000; 952 /** @hide */ 953 public static final int PROC_OUT_FLOAT = 0x4000; 954 955 /** @hide */ 956 public static final native boolean readProcFile(String file, int[] format, 957 String[] outStrings, long[] outLongs, float[] outFloats); 958 959 /** @hide */ 960 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 961 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 962 963 /** @hide */ 964 public static final native int[] getPidsForCommands(String[] cmds); 965 966 /** 967 * Gets the total Pss value for a given process, in bytes. 968 * 969 * @param pid the process to the Pss for 970 * @return the total Pss value for the given process in bytes, 971 * or -1 if the value cannot be determined 972 * @hide 973 */ 974 public static final native long getPss(int pid); 975 976 /** 977 * Specifies the outcome of having started a process. 978 * @hide 979 */ 980 public static final class ProcessStartResult { 981 /** 982 * The PID of the newly started process. 983 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 984 */ 985 public int pid; 986 987 /** 988 * True if the process was started with a wrapper attached. 989 */ 990 public boolean usingWrapper; 991 } 992} 993