1 /* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.os; 18 19 import android.annotation.TestApi; 20 import android.system.Os; 21 import android.system.OsConstants; 22 import android.util.Log; 23 import android.webkit.WebViewZygote; 24 import dalvik.system.VMRuntime; 25 26 /** 27 * Tools for managing OS processes. 28 */ 29 public class Process { 30 private static final String LOG_TAG = "Process"; 31 32 /** 33 * @hide for internal use only. 34 */ 35 public static final String ZYGOTE_SOCKET = "zygote"; 36 37 /** 38 * @hide for internal use only. 39 */ 40 public static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary"; 41 42 /** 43 * Defines the root UID. 44 * @hide 45 */ 46 public static final int ROOT_UID = 0; 47 48 /** 49 * Defines the UID/GID under which system code runs. 50 */ 51 public static final int SYSTEM_UID = 1000; 52 53 /** 54 * Defines the UID/GID under which the telephony code runs. 55 */ 56 public static final int PHONE_UID = 1001; 57 58 /** 59 * Defines the UID/GID for the user shell. 60 * @hide 61 */ 62 public static final int SHELL_UID = 2000; 63 64 /** 65 * Defines the UID/GID for the log group. 66 * @hide 67 */ 68 public static final int LOG_UID = 1007; 69 70 /** 71 * Defines the UID/GID for the WIFI supplicant process. 72 * @hide 73 */ 74 public static final int WIFI_UID = 1010; 75 76 /** 77 * Defines the UID/GID for the mediaserver process. 78 * @hide 79 */ 80 public static final int MEDIA_UID = 1013; 81 82 /** 83 * Defines the UID/GID for the DRM process. 84 * @hide 85 */ 86 public static final int DRM_UID = 1019; 87 88 /** 89 * Defines the UID/GID for the group that controls VPN services. 90 * @hide 91 */ 92 public static final int VPN_UID = 1016; 93 94 /** 95 * Defines the UID/GID for keystore. 96 * @hide 97 */ 98 public static final int KEYSTORE_UID = 1017; 99 100 /** 101 * Defines the UID/GID for the NFC service process. 102 * @hide 103 */ 104 public static final int NFC_UID = 1027; 105 106 /** 107 * Defines the UID/GID for the Bluetooth service process. 108 * @hide 109 */ 110 public static final int BLUETOOTH_UID = 1002; 111 112 /** 113 * Defines the GID for the group that allows write access to the internal media storage. 114 * @hide 115 */ 116 public static final int MEDIA_RW_GID = 1023; 117 118 /** 119 * Access to installed package details 120 * @hide 121 */ 122 public static final int PACKAGE_INFO_GID = 1032; 123 124 /** 125 * Defines the UID/GID for the shared RELRO file updater process. 126 * @hide 127 */ 128 public static final int SHARED_RELRO_UID = 1037; 129 130 /** 131 * Defines the UID/GID for the audioserver process. 132 * @hide 133 */ 134 public static final int AUDIOSERVER_UID = 1041; 135 136 /** 137 * Defines the UID/GID for the cameraserver process 138 * @hide 139 */ 140 public static final int CAMERASERVER_UID = 1047; 141 142 /** 143 * Defines the UID/GID for the WebView zygote process. 144 * @hide 145 */ 146 public static final int WEBVIEW_ZYGOTE_UID = 1051; 147 148 /** 149 * Defines the UID used for resource tracking for OTA updates. 150 * @hide 151 */ 152 public static final int OTA_UPDATE_UID = 1061; 153 154 /** 155 * Defines the start of a range of UIDs (and GIDs), going from this 156 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 157 * to applications. 158 */ 159 public static final int FIRST_APPLICATION_UID = 10000; 160 161 /** 162 * Last of application-specific UIDs starting at 163 * {@link #FIRST_APPLICATION_UID}. 164 */ 165 public static final int LAST_APPLICATION_UID = 19999; 166 167 /** 168 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 169 * @hide 170 */ 171 public static final int FIRST_ISOLATED_UID = 99000; 172 173 /** 174 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 175 * @hide 176 */ 177 public static final int LAST_ISOLATED_UID = 99999; 178 179 /** 180 * Defines the gid shared by all applications running under the same profile. 181 * @hide 182 */ 183 public static final int SHARED_USER_GID = 9997; 184 185 /** 186 * First gid for applications to share resources. Used when forward-locking 187 * is enabled but all UserHandles need to be able to read the resources. 188 * @hide 189 */ 190 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 191 192 /** 193 * Last gid for applications to share resources. Used when forward-locking 194 * is enabled but all UserHandles need to be able to read the resources. 195 * @hide 196 */ 197 public static final int LAST_SHARED_APPLICATION_GID = 59999; 198 199 /** {@hide} */ 200 public static final int FIRST_APPLICATION_CACHE_GID = 20000; 201 /** {@hide} */ 202 public static final int LAST_APPLICATION_CACHE_GID = 29999; 203 204 /** 205 * Standard priority of application threads. 206 * Use with {@link #setThreadPriority(int)} and 207 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 208 * {@link java.lang.Thread} class. 209 */ 210 public static final int THREAD_PRIORITY_DEFAULT = 0; 211 212 /* 213 * *************************************** 214 * ** Keep in sync with utils/threads.h ** 215 * *************************************** 216 */ 217 218 /** 219 * Lowest available thread priority. Only for those who really, really 220 * don't want to run if anything else is happening. 221 * Use with {@link #setThreadPriority(int)} and 222 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 223 * {@link java.lang.Thread} class. 224 */ 225 public static final int THREAD_PRIORITY_LOWEST = 19; 226 227 /** 228 * Standard priority background threads. This gives your thread a slightly 229 * lower than normal priority, so that it will have less chance of impacting 230 * the responsiveness of the user interface. 231 * Use with {@link #setThreadPriority(int)} and 232 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 233 * {@link java.lang.Thread} class. 234 */ 235 public static final int THREAD_PRIORITY_BACKGROUND = 10; 236 237 /** 238 * Standard priority of threads that are currently running a user interface 239 * that the user is interacting with. Applications can not normally 240 * change to this priority; the system will automatically adjust your 241 * application threads as the user moves through the UI. 242 * Use with {@link #setThreadPriority(int)} and 243 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 244 * {@link java.lang.Thread} class. 245 */ 246 public static final int THREAD_PRIORITY_FOREGROUND = -2; 247 248 /** 249 * Standard priority of system display threads, involved in updating 250 * the user interface. Applications can not 251 * normally change to this priority. 252 * Use with {@link #setThreadPriority(int)} and 253 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 254 * {@link java.lang.Thread} class. 255 */ 256 public static final int THREAD_PRIORITY_DISPLAY = -4; 257 258 /** 259 * Standard priority of the most important display threads, for compositing 260 * the screen and retrieving input events. Applications can not normally 261 * change to this priority. 262 * Use with {@link #setThreadPriority(int)} and 263 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 264 * {@link java.lang.Thread} class. 265 */ 266 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 267 268 /** 269 * Standard priority of audio threads. Applications can not normally 270 * change to this priority. 271 * Use with {@link #setThreadPriority(int)} and 272 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 273 * {@link java.lang.Thread} class. 274 */ 275 public static final int THREAD_PRIORITY_AUDIO = -16; 276 277 /** 278 * Standard priority of the most important audio threads. 279 * Applications can not normally change to this priority. 280 * Use with {@link #setThreadPriority(int)} and 281 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 282 * {@link java.lang.Thread} class. 283 */ 284 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 285 286 /** 287 * Minimum increment to make a priority more favorable. 288 */ 289 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 290 291 /** 292 * Minimum increment to make a priority less favorable. 293 */ 294 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 295 296 /** 297 * Default scheduling policy 298 * @hide 299 */ 300 public static final int SCHED_OTHER = 0; 301 302 /** 303 * First-In First-Out scheduling policy 304 * @hide 305 */ 306 public static final int SCHED_FIFO = 1; 307 308 /** 309 * Round-Robin scheduling policy 310 * @hide 311 */ 312 public static final int SCHED_RR = 2; 313 314 /** 315 * Batch scheduling policy 316 * @hide 317 */ 318 public static final int SCHED_BATCH = 3; 319 320 /** 321 * Idle scheduling policy 322 * @hide 323 */ 324 public static final int SCHED_IDLE = 5; 325 326 /** 327 * Reset scheduler choice on fork. 328 * @hide 329 */ 330 public static final int SCHED_RESET_ON_FORK = 0x40000000; 331 332 // Keep in sync with SP_* constants of enum type SchedPolicy 333 // declared in system/core/include/cutils/sched_policy.h, 334 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 335 336 /** 337 * Default thread group - 338 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 339 * When used with setProcessGroup(), the group of each thread in the process 340 * is conditionally changed based on that thread's current priority, as follows: 341 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 342 * are moved to foreground thread group. All other threads are left unchanged. 343 * @hide 344 */ 345 public static final int THREAD_GROUP_DEFAULT = -1; 346 347 /** 348 * Background thread group - All threads in 349 * this group are scheduled with a reduced share of the CPU. 350 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 351 * FIXME rename to THREAD_GROUP_BACKGROUND. 352 * @hide 353 */ 354 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 355 356 /** 357 * Foreground thread group - All threads in 358 * this group are scheduled with a normal share of the CPU. 359 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 360 * Not used at this level. 361 * @hide 362 **/ 363 private static final int THREAD_GROUP_FOREGROUND = 1; 364 365 /** 366 * System thread group. 367 * @hide 368 **/ 369 public static final int THREAD_GROUP_SYSTEM = 2; 370 371 /** 372 * Application audio thread group. 373 * @hide 374 **/ 375 public static final int THREAD_GROUP_AUDIO_APP = 3; 376 377 /** 378 * System audio thread group. 379 * @hide 380 **/ 381 public static final int THREAD_GROUP_AUDIO_SYS = 4; 382 383 /** 384 * Thread group for top foreground app. 385 * @hide 386 **/ 387 public static final int THREAD_GROUP_TOP_APP = 5; 388 389 /** 390 * Thread group for RT app. 391 * @hide 392 **/ 393 public static final int THREAD_GROUP_RT_APP = 6; 394 395 public static final int SIGNAL_QUIT = 3; 396 public static final int SIGNAL_KILL = 9; 397 public static final int SIGNAL_USR1 = 10; 398 399 private static long sStartElapsedRealtime; 400 private static long sStartUptimeMillis; 401 402 /** 403 * State associated with the zygote process. 404 * @hide 405 */ 406 public static final ZygoteProcess zygoteProcess = 407 new ZygoteProcess(ZYGOTE_SOCKET, SECONDARY_ZYGOTE_SOCKET); 408 409 /** 410 * Start a new process. 411 * 412 * <p>If processes are enabled, a new process is created and the 413 * static main() function of a <var>processClass</var> is executed there. 414 * The process will continue running after this function returns. 415 * 416 * <p>If processes are not enabled, a new thread in the caller's 417 * process is created and main() of <var>processClass</var> called there. 418 * 419 * <p>The niceName parameter, if not an empty string, is a custom name to 420 * give to the process instead of using processClass. This allows you to 421 * make easily identifyable processes even if you are using the same base 422 * <var>processClass</var> to start them. 423 * 424 * When invokeWith is not null, the process will be started as a fresh app 425 * and not a zygote fork. Note that this is only allowed for uid 0 or when 426 * debugFlags contains DEBUG_ENABLE_DEBUGGER. 427 * 428 * @param processClass The class to use as the process's main entry 429 * point. 430 * @param niceName A more readable name to use for the process. 431 * @param uid The user-id under which the process will run. 432 * @param gid The group-id under which the process will run. 433 * @param gids Additional group-ids associated with the process. 434 * @param debugFlags Additional flags. 435 * @param targetSdkVersion The target SDK version for the app. 436 * @param seInfo null-ok SELinux information for the new process. 437 * @param abi non-null the ABI this app should be started with. 438 * @param instructionSet null-ok the instruction set to use. 439 * @param appDataDir null-ok the data directory of the app. 440 * @param invokeWith null-ok the command to invoke with. 441 * @param zygoteArgs Additional arguments to supply to the zygote process. 442 * 443 * @return An object that describes the result of the attempt to start the process. 444 * @throws RuntimeException on fatal start failure 445 * 446 * {@hide} 447 */ 448 public static final ProcessStartResult start(final String processClass, 449 final String niceName, 450 int uid, int gid, int[] gids, 451 int debugFlags, int mountExternal, 452 int targetSdkVersion, 453 String seInfo, 454 String abi, 455 String instructionSet, 456 String appDataDir, 457 String invokeWith, 458 String[] zygoteArgs) { 459 return zygoteProcess.start(processClass, niceName, uid, gid, gids, 460 debugFlags, mountExternal, targetSdkVersion, seInfo, 461 abi, instructionSet, appDataDir, invokeWith, zygoteArgs); 462 } 463 464 /** @hide */ 465 public static final ProcessStartResult startWebView(final String processClass, 466 final String niceName, 467 int uid, int gid, int[] gids, 468 int debugFlags, int mountExternal, 469 int targetSdkVersion, 470 String seInfo, 471 String abi, 472 String instructionSet, 473 String appDataDir, 474 String invokeWith, 475 String[] zygoteArgs) { 476 return WebViewZygote.getProcess().start(processClass, niceName, uid, gid, gids, 477 debugFlags, mountExternal, targetSdkVersion, seInfo, 478 abi, instructionSet, appDataDir, invokeWith, zygoteArgs); 479 } 480 481 /** 482 * Returns elapsed milliseconds of the time this process has run. 483 * @return Returns the number of milliseconds this process has return. 484 */ 485 public static final native long getElapsedCpuTime(); 486 487 /** 488 * Return the {@link SystemClock#elapsedRealtime()} at which this process was started. 489 */ 490 public static final long getStartElapsedRealtime() { 491 return sStartElapsedRealtime; 492 } 493 494 /** 495 * Return the {@link SystemClock#uptimeMillis()} at which this process was started. 496 */ 497 public static final long getStartUptimeMillis() { 498 return sStartUptimeMillis; 499 } 500 501 /** @hide */ 502 public static final void setStartTimes(long elapsedRealtime, long uptimeMillis) { 503 sStartElapsedRealtime = elapsedRealtime; 504 sStartUptimeMillis = uptimeMillis; 505 } 506 507 /** 508 * Returns true if the current process is a 64-bit runtime. 509 */ 510 public static final boolean is64Bit() { 511 return VMRuntime.getRuntime().is64Bit(); 512 } 513 514 /** 515 * Returns the identifier of this process, which can be used with 516 * {@link #killProcess} and {@link #sendSignal}. 517 */ 518 public static final int myPid() { 519 return Os.getpid(); 520 } 521 522 /** 523 * Returns the identifier of this process' parent. 524 * @hide 525 */ 526 public static final int myPpid() { 527 return Os.getppid(); 528 } 529 530 /** 531 * Returns the identifier of the calling thread, which be used with 532 * {@link #setThreadPriority(int, int)}. 533 */ 534 public static final int myTid() { 535 return Os.gettid(); 536 } 537 538 /** 539 * Returns the identifier of this process's uid. This is the kernel uid 540 * that the process is running under, which is the identity of its 541 * app-specific sandbox. It is different from {@link #myUserHandle} in that 542 * a uid identifies a specific app sandbox in a specific user. 543 */ 544 public static final int myUid() { 545 return Os.getuid(); 546 } 547 548 /** 549 * Returns this process's user handle. This is the 550 * user the process is running under. It is distinct from 551 * {@link #myUid()} in that a particular user will have multiple 552 * distinct apps running under it each with their own uid. 553 */ 554 public static UserHandle myUserHandle() { 555 return UserHandle.of(UserHandle.getUserId(myUid())); 556 } 557 558 /** 559 * Returns whether the given uid belongs to an application. 560 * @param uid A kernel uid. 561 * @return Whether the uid corresponds to an application sandbox running in 562 * a specific user. 563 */ 564 public static boolean isApplicationUid(int uid) { 565 return UserHandle.isApp(uid); 566 } 567 568 /** 569 * Returns whether the current process is in an isolated sandbox. 570 * @hide 571 */ 572 public static final boolean isIsolated() { 573 return isIsolated(myUid()); 574 } 575 576 /** {@hide} */ 577 public static final boolean isIsolated(int uid) { 578 uid = UserHandle.getAppId(uid); 579 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 580 } 581 582 /** 583 * Returns the UID assigned to a particular user name, or -1 if there is 584 * none. If the given string consists of only numbers, it is converted 585 * directly to a uid. 586 */ 587 public static final native int getUidForName(String name); 588 589 /** 590 * Returns the GID assigned to a particular user name, or -1 if there is 591 * none. If the given string consists of only numbers, it is converted 592 * directly to a gid. 593 */ 594 public static final native int getGidForName(String name); 595 596 /** 597 * Returns a uid for a currently running process. 598 * @param pid the process id 599 * @return the uid of the process, or -1 if the process is not running. 600 * @hide pending API council review 601 */ 602 public static final int getUidForPid(int pid) { 603 String[] procStatusLabels = { "Uid:" }; 604 long[] procStatusValues = new long[1]; 605 procStatusValues[0] = -1; 606 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 607 return (int) procStatusValues[0]; 608 } 609 610 /** 611 * Returns the parent process id for a currently running process. 612 * @param pid the process id 613 * @return the parent process id of the process, or -1 if the process is not running. 614 * @hide 615 */ 616 public static final int getParentPid(int pid) { 617 String[] procStatusLabels = { "PPid:" }; 618 long[] procStatusValues = new long[1]; 619 procStatusValues[0] = -1; 620 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 621 return (int) procStatusValues[0]; 622 } 623 624 /** 625 * Returns the thread group leader id for a currently running thread. 626 * @param tid the thread id 627 * @return the thread group leader id of the thread, or -1 if the thread is not running. 628 * This is same as what getpid(2) would return if called by tid. 629 * @hide 630 */ 631 public static final int getThreadGroupLeader(int tid) { 632 String[] procStatusLabels = { "Tgid:" }; 633 long[] procStatusValues = new long[1]; 634 procStatusValues[0] = -1; 635 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 636 return (int) procStatusValues[0]; 637 } 638 639 /** 640 * Set the priority of a thread, based on Linux priorities. 641 * 642 * @param tid The identifier of the thread/process to change. 643 * @param priority A Linux priority level, from -20 for highest scheduling 644 * priority to 19 for lowest scheduling priority. 645 * 646 * @throws IllegalArgumentException Throws IllegalArgumentException if 647 * <var>tid</var> does not exist. 648 * @throws SecurityException Throws SecurityException if your process does 649 * not have permission to modify the given thread, or to use the given 650 * priority. 651 */ 652 public static final native void setThreadPriority(int tid, int priority) 653 throws IllegalArgumentException, SecurityException; 654 655 /** 656 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 657 * throw an exception if passed a background-level thread priority. This is only 658 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 659 * 660 * @hide 661 */ 662 public static final native void setCanSelfBackground(boolean backgroundOk); 663 664 /** 665 * Sets the scheduling group for a thread. 666 * @hide 667 * @param tid The identifier of the thread to change. 668 * @param group The target group for this thread from THREAD_GROUP_*. 669 * 670 * @throws IllegalArgumentException Throws IllegalArgumentException if 671 * <var>tid</var> does not exist. 672 * @throws SecurityException Throws SecurityException if your process does 673 * not have permission to modify the given thread, or to use the given 674 * priority. 675 * If the thread is a thread group leader, that is it's gettid() == getpid(), 676 * then the other threads in the same thread group are _not_ affected. 677 * 678 * Does not set cpuset for some historical reason, just calls 679 * libcutils::set_sched_policy(). 680 */ 681 public static final native void setThreadGroup(int tid, int group) 682 throws IllegalArgumentException, SecurityException; 683 684 /** 685 * Sets the scheduling group and the corresponding cpuset group 686 * @hide 687 * @param tid The identifier of the thread to change. 688 * @param group The target group for this thread from THREAD_GROUP_*. 689 * 690 * @throws IllegalArgumentException Throws IllegalArgumentException if 691 * <var>tid</var> does not exist. 692 * @throws SecurityException Throws SecurityException if your process does 693 * not have permission to modify the given thread, or to use the given 694 * priority. 695 */ 696 public static final native void setThreadGroupAndCpuset(int tid, int group) 697 throws IllegalArgumentException, SecurityException; 698 699 /** 700 * Sets the scheduling group for a process and all child threads 701 * @hide 702 * @param pid The identifier of the process to change. 703 * @param group The target group for this process from THREAD_GROUP_*. 704 * 705 * @throws IllegalArgumentException Throws IllegalArgumentException if 706 * <var>tid</var> does not exist. 707 * @throws SecurityException Throws SecurityException if your process does 708 * not have permission to modify the given thread, or to use the given 709 * priority. 710 * 711 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 712 * threads to the foreground scheduling group, but to leave background 713 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 714 * threads, regardless of priority, to the background scheduling group. 715 * group == THREAD_GROUP_FOREGROUND is not allowed. 716 * 717 * Always sets cpusets. 718 */ 719 public static final native void setProcessGroup(int pid, int group) 720 throws IllegalArgumentException, SecurityException; 721 722 /** 723 * Return the scheduling group of requested process. 724 * 725 * @hide 726 */ 727 public static final native int getProcessGroup(int pid) 728 throws IllegalArgumentException, SecurityException; 729 730 /** 731 * On some devices, the foreground process may have one or more CPU 732 * cores exclusively reserved for it. This method can be used to 733 * retrieve which cores that are (if any), so the calling process 734 * can then use sched_setaffinity() to lock a thread to these cores. 735 * Note that the calling process must currently be running in the 736 * foreground for this method to return any cores. 737 * 738 * The CPU core(s) exclusively reserved for the foreground process will 739 * stay reserved for as long as the process stays in the foreground. 740 * 741 * As soon as a process leaves the foreground, those CPU cores will 742 * no longer be reserved for it, and will most likely be reserved for 743 * the new foreground process. It's not necessary to change the affinity 744 * of your process when it leaves the foreground (if you had previously 745 * set it to use a reserved core); the OS will automatically take care 746 * of resetting the affinity at that point. 747 * 748 * @return an array of integers, indicating the CPU cores exclusively 749 * reserved for this process. The array will have length zero if no 750 * CPU cores are exclusively reserved for this process at this point 751 * in time. 752 */ 753 public static final native int[] getExclusiveCores(); 754 755 /** 756 * Set the priority of the calling thread, based on Linux priorities. See 757 * {@link #setThreadPriority(int, int)} for more information. 758 * 759 * @param priority A Linux priority level, from -20 for highest scheduling 760 * priority to 19 for lowest scheduling priority. 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 * 768 * @see #setThreadPriority(int, int) 769 */ 770 public static final native void setThreadPriority(int priority) 771 throws IllegalArgumentException, SecurityException; 772 773 /** 774 * Return the current priority of a thread, based on Linux priorities. 775 * 776 * @param tid The identifier of the thread/process. If tid equals zero, the priority of the 777 * calling process/thread will be returned. 778 * 779 * @return Returns the current priority, as a Linux priority level, 780 * from -20 for highest scheduling priority to 19 for lowest scheduling 781 * priority. 782 * 783 * @throws IllegalArgumentException Throws IllegalArgumentException if 784 * <var>tid</var> does not exist. 785 */ 786 public static final native int getThreadPriority(int tid) 787 throws IllegalArgumentException; 788 789 /** 790 * Return the current scheduling policy of a thread, based on Linux. 791 * 792 * @param tid The identifier of the thread/process to get the scheduling policy. 793 * 794 * @throws IllegalArgumentException Throws IllegalArgumentException if 795 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 796 * @throws SecurityException Throws SecurityException if your process does 797 * not have permission to modify the given thread, or to use the given 798 * scheduling policy or priority. 799 * 800 * {@hide} 801 */ 802 803 @TestApi 804 public static final native int getThreadScheduler(int tid) 805 throws IllegalArgumentException; 806 807 /** 808 * Set the scheduling policy and priority of a thread, based on Linux. 809 * 810 * @param tid The identifier of the thread/process to change. 811 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 812 * @param priority A Linux priority level in a range appropriate for the given policy. 813 * 814 * @throws IllegalArgumentException Throws IllegalArgumentException if 815 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 816 * @throws SecurityException Throws SecurityException if your process does 817 * not have permission to modify the given thread, or to use the given 818 * scheduling policy or priority. 819 * 820 * {@hide} 821 */ 822 823 public static final native void setThreadScheduler(int tid, int policy, int priority) 824 throws IllegalArgumentException; 825 826 /** 827 * Determine whether the current environment supports multiple processes. 828 * 829 * @return Returns true if the system can run in multiple processes, else 830 * false if everything is running in a single process. 831 * 832 * @deprecated This method always returns true. Do not use. 833 */ 834 @Deprecated 835 public static final boolean supportsProcesses() { 836 return true; 837 } 838 839 /** 840 * Adjust the swappiness level for a process. 841 * 842 * @param pid The process identifier to set. 843 * @param is_increased Whether swappiness should be increased or default. 844 * 845 * @return Returns true if the underlying system supports this 846 * feature, else false. 847 * 848 * {@hide} 849 */ 850 public static final native boolean setSwappiness(int pid, boolean is_increased); 851 852 /** 853 * Change this process's argv[0] parameter. This can be useful to show 854 * more descriptive information in things like the 'ps' command. 855 * 856 * @param text The new name of this process. 857 * 858 * {@hide} 859 */ 860 public static final native void setArgV0(String text); 861 862 /** 863 * Kill the process with the given PID. 864 * Note that, though this API allows us to request to 865 * kill any process based on its PID, the kernel will 866 * still impose standard restrictions on which PIDs you 867 * are actually able to kill. Typically this means only 868 * the process running the caller's packages/application 869 * and any additional processes created by that app; packages 870 * sharing a common UID will also be able to kill each 871 * other's processes. 872 */ 873 public static final void killProcess(int pid) { 874 sendSignal(pid, SIGNAL_KILL); 875 } 876 877 /** @hide */ 878 public static final native int setUid(int uid); 879 880 /** @hide */ 881 public static final native int setGid(int uid); 882 883 /** 884 * Send a signal to the given process. 885 * 886 * @param pid The pid of the target process. 887 * @param signal The signal to send. 888 */ 889 public static final native void sendSignal(int pid, int signal); 890 891 /** 892 * @hide 893 * Private impl for avoiding a log message... DO NOT USE without doing 894 * your own log, or the Android Illuminati will find you some night and 895 * beat you up. 896 */ 897 public static final void killProcessQuiet(int pid) { 898 sendSignalQuiet(pid, SIGNAL_KILL); 899 } 900 901 /** 902 * @hide 903 * Private impl for avoiding a log message... DO NOT USE without doing 904 * your own log, or the Android Illuminati will find you some night and 905 * beat you up. 906 */ 907 public static final native void sendSignalQuiet(int pid, int signal); 908 909 /** @hide */ 910 public static final native long getFreeMemory(); 911 912 /** @hide */ 913 public static final native long getTotalMemory(); 914 915 /** @hide */ 916 public static final native void readProcLines(String path, 917 String[] reqFields, long[] outSizes); 918 919 /** @hide */ 920 public static final native int[] getPids(String path, int[] lastArray); 921 922 /** @hide */ 923 public static final int PROC_TERM_MASK = 0xff; 924 /** @hide */ 925 public static final int PROC_ZERO_TERM = 0; 926 /** @hide */ 927 public static final int PROC_SPACE_TERM = (int)' '; 928 /** @hide */ 929 public static final int PROC_TAB_TERM = (int)'\t'; 930 /** @hide */ 931 public static final int PROC_COMBINE = 0x100; 932 /** @hide */ 933 public static final int PROC_PARENS = 0x200; 934 /** @hide */ 935 public static final int PROC_QUOTES = 0x400; 936 /** @hide */ 937 public static final int PROC_CHAR = 0x800; 938 /** @hide */ 939 public static final int PROC_OUT_STRING = 0x1000; 940 /** @hide */ 941 public static final int PROC_OUT_LONG = 0x2000; 942 /** @hide */ 943 public static final int PROC_OUT_FLOAT = 0x4000; 944 945 /** @hide */ 946 public static final native boolean readProcFile(String file, int[] format, 947 String[] outStrings, long[] outLongs, float[] outFloats); 948 949 /** @hide */ 950 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 951 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 952 953 /** @hide */ 954 public static final native int[] getPidsForCommands(String[] cmds); 955 956 /** 957 * Gets the total Pss value for a given process, in bytes. 958 * 959 * @param pid the process to the Pss for 960 * @return the total Pss value for the given process in bytes, 961 * or -1 if the value cannot be determined 962 * @hide 963 */ 964 public static final native long getPss(int pid); 965 966 /** 967 * Specifies the outcome of having started a process. 968 * @hide 969 */ 970 public static final class ProcessStartResult { 971 /** 972 * The PID of the newly started process. 973 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 974 */ 975 public int pid; 976 977 /** 978 * True if the process was started with a wrapper attached. 979 */ 980 public boolean usingWrapper; 981 } 982 983 /** 984 * Kill all processes in a process group started for the given 985 * pid. 986 * @hide 987 */ 988 public static final native int killProcessGroup(int uid, int pid); 989 990 /** 991 * Remove all process groups. Expected to be called when ActivityManager 992 * is restarted. 993 * @hide 994 */ 995 public static final native void removeAllProcessGroups(); 996 997 /** 998 * Check to see if a thread belongs to a given process. This may require 999 * more permissions than apps generally have. 1000 * @return true if this thread belongs to a process 1001 * @hide 1002 */ 1003 public static final boolean isThreadInProcess(int tid, int pid) { 1004 StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads(); 1005 try { 1006 if (Os.access("/proc/" + tid + "/task/" + pid, OsConstants.F_OK)) { 1007 return true; 1008 } else { 1009 return false; 1010 } 1011 } catch (Exception e) { 1012 return false; 1013 } finally { 1014 StrictMode.setThreadPolicy(oldPolicy); 1015 } 1016 1017 } 1018 } 1019
