Process.java revision 6d4b1e24aef5b74b40de4d8f6e63c21874ce8e3a
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 30import libcore.io.Libcore; 31 32/*package*/ class ZygoteStartFailedEx extends Exception { 33 /** 34 * Something prevented the zygote process startup from happening normally 35 */ 36 37 ZygoteStartFailedEx() {}; 38 ZygoteStartFailedEx(String s) {super(s);} 39 ZygoteStartFailedEx(Throwable cause) {super(cause);} 40} 41 42/** 43 * Tools for managing OS processes. 44 */ 45public class Process { 46 private static final String LOG_TAG = "Process"; 47 48 private static final String ZYGOTE_SOCKET = "zygote"; 49 50 /** 51 * Name of a process for running the platform's media services. 52 * {@hide} 53 */ 54 public static final String ANDROID_SHARED_MEDIA = "com.android.process.media"; 55 56 /** 57 * Name of the process that Google content providers can share. 58 * {@hide} 59 */ 60 public static final String GOOGLE_SHARED_APP_CONTENT = "com.google.process.content"; 61 62 /** 63 * Defines the UID/GID under which system code runs. 64 */ 65 public static final int SYSTEM_UID = 1000; 66 67 /** 68 * Defines the UID/GID under which the telephony code runs. 69 */ 70 public static final int PHONE_UID = 1001; 71 72 /** 73 * Defines the UID/GID for the user shell. 74 * @hide 75 */ 76 public static final int SHELL_UID = 2000; 77 78 /** 79 * Defines the UID/GID for the log group. 80 * @hide 81 */ 82 public static final int LOG_UID = 1007; 83 84 /** 85 * Defines the UID/GID for the WIFI supplicant process. 86 * @hide 87 */ 88 public static final int WIFI_UID = 1010; 89 90 /** 91 * Defines the UID/GID for the mediaserver process. 92 * @hide 93 */ 94 public static final int MEDIA_UID = 1013; 95 96 /** 97 * Defines the UID/GID for the DRM process. 98 * @hide 99 */ 100 public static final int DRM_UID = 1019; 101 102 /** 103 * Defines the GID for the group that allows write access to the SD card. 104 * @hide 105 */ 106 public static final int SDCARD_RW_GID = 1015; 107 108 /** 109 * Defines the UID/GID for the group that controls VPN services. 110 * @hide 111 */ 112 public static final int VPN_UID = 1016; 113 114 /** 115 * Defines the UID/GID for the NFC service process. 116 * @hide 117 */ 118 public static final int NFC_UID = 1027; 119 120 /** 121 * Defines the UID/GID for the Bluetooth service process. 122 * @hide 123 */ 124 public static final int BLUETOOTH_UID = 1002; 125 126 /** 127 * Defines the GID for the group that allows write access to the internal media storage. 128 * @hide 129 */ 130 public static final int MEDIA_RW_GID = 1023; 131 132 /** 133 * Defines the start of a range of UIDs (and GIDs), going from this 134 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 135 * to applications. 136 */ 137 public static final int FIRST_APPLICATION_UID = 10000; 138 /** 139 * Last of application-specific UIDs starting at 140 * {@link #FIRST_APPLICATION_UID}. 141 */ 142 public static final int LAST_APPLICATION_UID = 19999; 143 144 /** 145 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 146 * @hide 147 */ 148 public static final int FIRST_ISOLATED_UID = 99000; 149 150 /** 151 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 152 * @hide 153 */ 154 public static final int LAST_ISOLATED_UID = 99999; 155 156 /** 157 * First gid for applications to share resources. Used when forward-locking 158 * is enabled but all UserHandles need to be able to read the resources. 159 * @hide 160 */ 161 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 162 163 /** 164 * Last gid for applications to share resources. Used when forward-locking 165 * is enabled but all UserHandles need to be able to read the resources. 166 * @hide 167 */ 168 public static final int LAST_SHARED_APPLICATION_GID = 59999; 169 170 /** 171 * Standard priority of application threads. 172 * Use with {@link #setThreadPriority(int)} and 173 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 174 * {@link java.lang.Thread} class. 175 */ 176 public static final int THREAD_PRIORITY_DEFAULT = 0; 177 178 /* 179 * *************************************** 180 * ** Keep in sync with utils/threads.h ** 181 * *************************************** 182 */ 183 184 /** 185 * Lowest available thread priority. Only for those who really, really 186 * don't want to run if anything else is happening. 187 * Use with {@link #setThreadPriority(int)} and 188 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 189 * {@link java.lang.Thread} class. 190 */ 191 public static final int THREAD_PRIORITY_LOWEST = 19; 192 193 /** 194 * Standard priority background threads. This gives your thread a slightly 195 * lower than normal priority, so that it will have less chance of impacting 196 * the responsiveness of the user interface. 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_BACKGROUND = 10; 202 203 /** 204 * Standard priority of threads that are currently running a user interface 205 * that the user is interacting with. Applications can not normally 206 * change to this priority; the system will automatically adjust your 207 * application threads as the user moves through the UI. 208 * Use with {@link #setThreadPriority(int)} and 209 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 210 * {@link java.lang.Thread} class. 211 */ 212 public static final int THREAD_PRIORITY_FOREGROUND = -2; 213 214 /** 215 * Standard priority of system display threads, involved in updating 216 * the user interface. Applications can not 217 * normally change to this priority. 218 * Use with {@link #setThreadPriority(int)} and 219 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 220 * {@link java.lang.Thread} class. 221 */ 222 public static final int THREAD_PRIORITY_DISPLAY = -4; 223 224 /** 225 * Standard priority of the most important display threads, for compositing 226 * the screen and retrieving input events. Applications can not normally 227 * change to this priority. 228 * Use with {@link #setThreadPriority(int)} and 229 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 230 * {@link java.lang.Thread} class. 231 */ 232 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 233 234 /** 235 * Standard priority of audio threads. Applications can not normally 236 * change to this priority. 237 * Use with {@link #setThreadPriority(int)} and 238 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 239 * {@link java.lang.Thread} class. 240 */ 241 public static final int THREAD_PRIORITY_AUDIO = -16; 242 243 /** 244 * Standard priority of the most important audio threads. 245 * Applications can not normally change to this priority. 246 * Use with {@link #setThreadPriority(int)} and 247 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 248 * {@link java.lang.Thread} class. 249 */ 250 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 251 252 /** 253 * Minimum increment to make a priority more favorable. 254 */ 255 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 256 257 /** 258 * Minimum increment to make a priority less favorable. 259 */ 260 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 261 262 /** 263 * Default scheduling policy 264 * @hide 265 */ 266 public static final int SCHED_OTHER = 0; 267 268 /** 269 * First-In First-Out scheduling policy 270 * @hide 271 */ 272 public static final int SCHED_FIFO = 1; 273 274 /** 275 * Round-Robin scheduling policy 276 * @hide 277 */ 278 public static final int SCHED_RR = 2; 279 280 /** 281 * Batch scheduling policy 282 * @hide 283 */ 284 public static final int SCHED_BATCH = 3; 285 286 /** 287 * Idle scheduling policy 288 * @hide 289 */ 290 public static final int SCHED_IDLE = 5; 291 292 // Keep in sync with SP_* constants of enum type SchedPolicy 293 // declared in system/core/include/cutils/sched_policy.h, 294 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 295 296 /** 297 * Default thread group - 298 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 299 * When used with setProcessGroup(), the group of each thread in the process 300 * is conditionally changed based on that thread's current priority, as follows: 301 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 302 * are moved to foreground thread group. All other threads are left unchanged. 303 * @hide 304 */ 305 public static final int THREAD_GROUP_DEFAULT = -1; 306 307 /** 308 * Background thread group - All threads in 309 * this group are scheduled with a reduced share of the CPU. 310 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 311 * FIXME rename to THREAD_GROUP_BACKGROUND. 312 * @hide 313 */ 314 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 315 316 /** 317 * Foreground thread group - All threads in 318 * this group are scheduled with a normal share of the CPU. 319 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 320 * Not used at this level. 321 * @hide 322 **/ 323 private static final int THREAD_GROUP_FOREGROUND = 1; 324 325 /** 326 * System thread group. 327 * @hide 328 **/ 329 public static final int THREAD_GROUP_SYSTEM = 2; 330 331 /** 332 * Application audio thread group. 333 * @hide 334 **/ 335 public static final int THREAD_GROUP_AUDIO_APP = 3; 336 337 /** 338 * System audio thread group. 339 * @hide 340 **/ 341 public static final int THREAD_GROUP_AUDIO_SYS = 4; 342 343 public static final int SIGNAL_QUIT = 3; 344 public static final int SIGNAL_KILL = 9; 345 public static final int SIGNAL_USR1 = 10; 346 347 // State for communicating with zygote process 348 349 static LocalSocket sZygoteSocket; 350 static DataInputStream sZygoteInputStream; 351 static BufferedWriter sZygoteWriter; 352 353 /** true if previous zygote open failed */ 354 static boolean sPreviousZygoteOpenFailed; 355 356 /** 357 * Start a new process. 358 * 359 * <p>If processes are enabled, a new process is created and the 360 * static main() function of a <var>processClass</var> is executed there. 361 * The process will continue running after this function returns. 362 * 363 * <p>If processes are not enabled, a new thread in the caller's 364 * process is created and main() of <var>processClass</var> called there. 365 * 366 * <p>The niceName parameter, if not an empty string, is a custom name to 367 * give to the process instead of using processClass. This allows you to 368 * make easily identifyable processes even if you are using the same base 369 * <var>processClass</var> to start them. 370 * 371 * @param processClass The class to use as the process's main entry 372 * point. 373 * @param niceName A more readable name to use for the process. 374 * @param uid The user-id under which the process will run. 375 * @param gid The group-id under which the process will run. 376 * @param gids Additional group-ids associated with the process. 377 * @param debugFlags Additional flags. 378 * @param targetSdkVersion The target SDK version for the app. 379 * @param seInfo null-ok SE Android information for the new process. 380 * @param zygoteArgs Additional arguments to supply to the zygote process. 381 * 382 * @return An object that describes the result of the attempt to start the process. 383 * @throws RuntimeException on fatal start failure 384 * 385 * {@hide} 386 */ 387 public static final ProcessStartResult start(final String processClass, 388 final String niceName, 389 int uid, int gid, int[] gids, 390 int debugFlags, int mountExternal, 391 int targetSdkVersion, 392 String seInfo, 393 String[] zygoteArgs) { 394 try { 395 return startViaZygote(processClass, niceName, uid, gid, gids, 396 debugFlags, mountExternal, targetSdkVersion, seInfo, zygoteArgs); 397 } catch (ZygoteStartFailedEx ex) { 398 Log.e(LOG_TAG, 399 "Starting VM process through Zygote failed"); 400 throw new RuntimeException( 401 "Starting VM process through Zygote failed", ex); 402 } 403 } 404 405 /** retry interval for opening a zygote socket */ 406 static final int ZYGOTE_RETRY_MILLIS = 500; 407 408 /** 409 * Tries to open socket to Zygote process if not already open. If 410 * already open, does nothing. May block and retry. 411 */ 412 private static void openZygoteSocketIfNeeded() 413 throws ZygoteStartFailedEx { 414 415 int retryCount; 416 417 if (sPreviousZygoteOpenFailed) { 418 /* 419 * If we've failed before, expect that we'll fail again and 420 * don't pause for retries. 421 */ 422 retryCount = 0; 423 } else { 424 retryCount = 10; 425 } 426 427 /* 428 * See bug #811181: Sometimes runtime can make it up before zygote. 429 * Really, we'd like to do something better to avoid this condition, 430 * but for now just wait a bit... 431 */ 432 for (int retry = 0 433 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 434 ; retry++ ) { 435 436 if (retry > 0) { 437 try { 438 Log.i("Zygote", "Zygote not up yet, sleeping..."); 439 Thread.sleep(ZYGOTE_RETRY_MILLIS); 440 } catch (InterruptedException ex) { 441 // should never happen 442 } 443 } 444 445 try { 446 sZygoteSocket = new LocalSocket(); 447 448 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 449 LocalSocketAddress.Namespace.RESERVED)); 450 451 sZygoteInputStream 452 = new DataInputStream(sZygoteSocket.getInputStream()); 453 454 sZygoteWriter = 455 new BufferedWriter( 456 new OutputStreamWriter( 457 sZygoteSocket.getOutputStream()), 458 256); 459 460 Log.i("Zygote", "Process: zygote socket opened"); 461 462 sPreviousZygoteOpenFailed = false; 463 break; 464 } catch (IOException ex) { 465 if (sZygoteSocket != null) { 466 try { 467 sZygoteSocket.close(); 468 } catch (IOException ex2) { 469 Log.e(LOG_TAG,"I/O exception on close after exception", 470 ex2); 471 } 472 } 473 474 sZygoteSocket = null; 475 } 476 } 477 478 if (sZygoteSocket == null) { 479 sPreviousZygoteOpenFailed = true; 480 throw new ZygoteStartFailedEx("connect failed"); 481 } 482 } 483 484 /** 485 * Sends an argument list to the zygote process, which starts a new child 486 * and returns the child's pid. Please note: the present implementation 487 * replaces newlines in the argument list with spaces. 488 * @param args argument list 489 * @return An object that describes the result of the attempt to start the process. 490 * @throws ZygoteStartFailedEx if process start failed for any reason 491 */ 492 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 493 throws ZygoteStartFailedEx { 494 openZygoteSocketIfNeeded(); 495 496 try { 497 /** 498 * See com.android.internal.os.ZygoteInit.readArgumentList() 499 * Presently the wire format to the zygote process is: 500 * a) a count of arguments (argc, in essence) 501 * b) a number of newline-separated argument strings equal to count 502 * 503 * After the zygote process reads these it will write the pid of 504 * the child or -1 on failure, followed by boolean to 505 * indicate whether a wrapper process was used. 506 */ 507 508 sZygoteWriter.write(Integer.toString(args.size())); 509 sZygoteWriter.newLine(); 510 511 int sz = args.size(); 512 for (int i = 0; i < sz; i++) { 513 String arg = args.get(i); 514 if (arg.indexOf('\n') >= 0) { 515 throw new ZygoteStartFailedEx( 516 "embedded newlines not allowed"); 517 } 518 sZygoteWriter.write(arg); 519 sZygoteWriter.newLine(); 520 } 521 522 sZygoteWriter.flush(); 523 524 // Should there be a timeout on this? 525 ProcessStartResult result = new ProcessStartResult(); 526 result.pid = sZygoteInputStream.readInt(); 527 if (result.pid < 0) { 528 throw new ZygoteStartFailedEx("fork() failed"); 529 } 530 result.usingWrapper = sZygoteInputStream.readBoolean(); 531 return result; 532 } catch (IOException ex) { 533 try { 534 if (sZygoteSocket != null) { 535 sZygoteSocket.close(); 536 } 537 } catch (IOException ex2) { 538 // we're going to fail anyway 539 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 540 } 541 542 sZygoteSocket = null; 543 544 throw new ZygoteStartFailedEx(ex); 545 } 546 } 547 548 /** 549 * Starts a new process via the zygote mechanism. 550 * 551 * @param processClass Class name whose static main() to run 552 * @param niceName 'nice' process name to appear in ps 553 * @param uid a POSIX uid that the new process should setuid() to 554 * @param gid a POSIX gid that the new process shuold setgid() to 555 * @param gids null-ok; a list of supplementary group IDs that the 556 * new process should setgroup() to. 557 * @param debugFlags Additional flags. 558 * @param targetSdkVersion The target SDK version for the app. 559 * @param seInfo null-ok SE Android information for the new process. 560 * @param extraArgs Additional arguments to supply to the zygote process. 561 * @return An object that describes the result of the attempt to start the process. 562 * @throws ZygoteStartFailedEx if process start failed for any reason 563 */ 564 private static ProcessStartResult startViaZygote(final String processClass, 565 final String niceName, 566 final int uid, final int gid, 567 final int[] gids, 568 int debugFlags, int mountExternal, 569 int targetSdkVersion, 570 String seInfo, 571 String[] extraArgs) 572 throws ZygoteStartFailedEx { 573 synchronized(Process.class) { 574 ArrayList<String> argsForZygote = new ArrayList<String>(); 575 576 // --runtime-init, --setuid=, --setgid=, 577 // and --setgroups= must go first 578 argsForZygote.add("--runtime-init"); 579 argsForZygote.add("--setuid=" + uid); 580 argsForZygote.add("--setgid=" + gid); 581 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 582 argsForZygote.add("--enable-jni-logging"); 583 } 584 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 585 argsForZygote.add("--enable-safemode"); 586 } 587 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 588 argsForZygote.add("--enable-debugger"); 589 } 590 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 591 argsForZygote.add("--enable-checkjni"); 592 } 593 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 594 argsForZygote.add("--enable-assert"); 595 } 596 if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER) { 597 argsForZygote.add("--mount-external-multiuser"); 598 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER_ALL) { 599 argsForZygote.add("--mount-external-multiuser-all"); 600 } 601 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 602 603 //TODO optionally enable debuger 604 //argsForZygote.add("--enable-debugger"); 605 606 // --setgroups is a comma-separated list 607 if (gids != null && gids.length > 0) { 608 StringBuilder sb = new StringBuilder(); 609 sb.append("--setgroups="); 610 611 int sz = gids.length; 612 for (int i = 0; i < sz; i++) { 613 if (i != 0) { 614 sb.append(','); 615 } 616 sb.append(gids[i]); 617 } 618 619 argsForZygote.add(sb.toString()); 620 } 621 622 if (niceName != null) { 623 argsForZygote.add("--nice-name=" + niceName); 624 } 625 626 if (seInfo != null) { 627 argsForZygote.add("--seinfo=" + seInfo); 628 } 629 630 argsForZygote.add(processClass); 631 632 if (extraArgs != null) { 633 for (String arg : extraArgs) { 634 argsForZygote.add(arg); 635 } 636 } 637 638 return zygoteSendArgsAndGetResult(argsForZygote); 639 } 640 } 641 642 /** 643 * Returns elapsed milliseconds of the time this process has run. 644 * @return Returns the number of milliseconds this process has return. 645 */ 646 public static final native long getElapsedCpuTime(); 647 648 /** 649 * Returns the identifier of this process, which can be used with 650 * {@link #killProcess} and {@link #sendSignal}. 651 */ 652 public static final int myPid() { 653 return Libcore.os.getpid(); 654 } 655 656 /** 657 * Returns the identifier of the calling thread, which be used with 658 * {@link #setThreadPriority(int, int)}. 659 */ 660 public static final int myTid() { 661 return Libcore.os.gettid(); 662 } 663 664 /** 665 * Returns the identifier of this process's uid. This is the kernel uid 666 * that the process is running under, which is the identity of its 667 * app-specific sandbox. It is different from {@link #myUserHandle} in that 668 * a uid identifies a specific app sandbox in a specific user. 669 */ 670 public static final int myUid() { 671 return Libcore.os.getuid(); 672 } 673 674 /** 675 * Returns this process's user handle. This is the 676 * user the process is running under. It is distinct from 677 * {@link #myUid()} in that a particular user will have multiple 678 * distinct apps running under it each with their own uid. 679 */ 680 public static final UserHandle myUserHandle() { 681 return new UserHandle(UserHandle.getUserId(myUid())); 682 } 683 684 /** 685 * Returns whether the current process is in an isolated sandbox. 686 * @hide 687 */ 688 public static final boolean isIsolated() { 689 int uid = UserHandle.getAppId(myUid()); 690 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 691 } 692 693 /** 694 * Returns the UID assigned to a particular user name, or -1 if there is 695 * none. If the given string consists of only numbers, it is converted 696 * directly to a uid. 697 */ 698 public static final native int getUidForName(String name); 699 700 /** 701 * Returns the GID assigned to a particular user name, or -1 if there is 702 * none. If the given string consists of only numbers, it is converted 703 * directly to a gid. 704 */ 705 public static final native int getGidForName(String name); 706 707 /** 708 * Returns a uid for a currently running process. 709 * @param pid the process id 710 * @return the uid of the process, or -1 if the process is not running. 711 * @hide pending API council review 712 */ 713 public static final int getUidForPid(int pid) { 714 String[] procStatusLabels = { "Uid:" }; 715 long[] procStatusValues = new long[1]; 716 procStatusValues[0] = -1; 717 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 718 return (int) procStatusValues[0]; 719 } 720 721 /** 722 * Returns the parent process id for a currently running process. 723 * @param pid the process id 724 * @return the parent process id of the process, or -1 if the process is not running. 725 * @hide 726 */ 727 public static final int getParentPid(int pid) { 728 String[] procStatusLabels = { "PPid:" }; 729 long[] procStatusValues = new long[1]; 730 procStatusValues[0] = -1; 731 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 732 return (int) procStatusValues[0]; 733 } 734 735 /** 736 * Returns the thread group leader id for a currently running thread. 737 * @param tid the thread id 738 * @return the thread group leader id of the thread, or -1 if the thread is not running. 739 * This is same as what getpid(2) would return if called by tid. 740 * @hide 741 */ 742 public static final int getThreadGroupLeader(int tid) { 743 String[] procStatusLabels = { "Tgid:" }; 744 long[] procStatusValues = new long[1]; 745 procStatusValues[0] = -1; 746 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 747 return (int) procStatusValues[0]; 748 } 749 750 /** 751 * Set the priority of a thread, based on Linux priorities. 752 * 753 * @param tid The identifier of the thread/process to change. 754 * @param priority A Linux priority level, from -20 for highest scheduling 755 * priority to 19 for lowest scheduling priority. 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 */ 763 public static final native void setThreadPriority(int tid, int priority) 764 throws IllegalArgumentException, SecurityException; 765 766 /** 767 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 768 * throw an exception if passed a background-level thread priority. This is only 769 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 770 * 771 * @hide 772 */ 773 public static final native void setCanSelfBackground(boolean backgroundOk); 774 775 /** 776 * Sets the scheduling group for a thread. 777 * @hide 778 * @param tid The identifier of the thread to change. 779 * @param group The target group for this thread from THREAD_GROUP_*. 780 * 781 * @throws IllegalArgumentException Throws IllegalArgumentException if 782 * <var>tid</var> does not exist. 783 * @throws SecurityException Throws SecurityException if your process does 784 * not have permission to modify the given thread, or to use the given 785 * priority. 786 * If the thread is a thread group leader, that is it's gettid() == getpid(), 787 * then the other threads in the same thread group are _not_ affected. 788 */ 789 public static final native void setThreadGroup(int tid, int group) 790 throws IllegalArgumentException, SecurityException; 791 792 /** 793 * Sets the scheduling group for a process and all child threads 794 * @hide 795 * @param pid The identifier of the process to change. 796 * @param group The target group for this process from THREAD_GROUP_*. 797 * 798 * @throws IllegalArgumentException Throws IllegalArgumentException if 799 * <var>tid</var> does not exist. 800 * @throws SecurityException Throws SecurityException if your process does 801 * not have permission to modify the given thread, or to use the given 802 * priority. 803 * 804 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 805 * threads to the foreground scheduling group, but to leave background 806 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 807 * threads, regardless of priority, to the background scheduling group. 808 * group == THREAD_GROUP_FOREGROUND is not allowed. 809 */ 810 public static final native void setProcessGroup(int pid, int group) 811 throws IllegalArgumentException, SecurityException; 812 813 /** 814 * Return the scheduling group of requested process. 815 * 816 * @hide 817 */ 818 public static final native int getProcessGroup(int pid) 819 throws IllegalArgumentException, SecurityException; 820 821 /** 822 * Set the priority of the calling thread, based on Linux priorities. See 823 * {@link #setThreadPriority(int, int)} for more information. 824 * 825 * @param priority A Linux priority level, from -20 for highest scheduling 826 * priority to 19 for lowest scheduling priority. 827 * 828 * @throws IllegalArgumentException Throws IllegalArgumentException if 829 * <var>tid</var> does not exist. 830 * @throws SecurityException Throws SecurityException if your process does 831 * not have permission to modify the given thread, or to use the given 832 * priority. 833 * 834 * @see #setThreadPriority(int, int) 835 */ 836 public static final native void setThreadPriority(int priority) 837 throws IllegalArgumentException, SecurityException; 838 839 /** 840 * Return the current priority of a thread, based on Linux priorities. 841 * 842 * @param tid The identifier of the thread/process to change. 843 * 844 * @return Returns the current priority, as a Linux priority level, 845 * from -20 for highest scheduling priority to 19 for lowest scheduling 846 * priority. 847 * 848 * @throws IllegalArgumentException Throws IllegalArgumentException if 849 * <var>tid</var> does not exist. 850 */ 851 public static final native int getThreadPriority(int tid) 852 throws IllegalArgumentException; 853 854 /** 855 * Set the scheduling policy and priority of a thread, based on Linux. 856 * 857 * @param tid The identifier of the thread/process to change. 858 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 859 * @param priority A Linux priority level in a range appropriate for the given policy. 860 * 861 * @throws IllegalArgumentException Throws IllegalArgumentException if 862 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 863 * @throws SecurityException Throws SecurityException if your process does 864 * not have permission to modify the given thread, or to use the given 865 * scheduling policy or priority. 866 * 867 * {@hide} 868 */ 869 public static final native void setThreadScheduler(int tid, int policy, int priority) 870 throws IllegalArgumentException; 871 872 /** 873 * Determine whether the current environment supports multiple processes. 874 * 875 * @return Returns true if the system can run in multiple processes, else 876 * false if everything is running in a single process. 877 * 878 * @deprecated This method always returns true. Do not use. 879 */ 880 @Deprecated 881 public static final boolean supportsProcesses() { 882 return true; 883 } 884 885 /** 886 * Set the out-of-memory badness adjustment for a process. 887 * 888 * @param pid The process identifier to set. 889 * @param amt Adjustment value -- linux allows -16 to +15. 890 * 891 * @return Returns true if the underlying system supports this 892 * feature, else false. 893 * 894 * {@hide} 895 */ 896 public static final native boolean setOomAdj(int pid, int amt); 897 898 /** 899 * Change this process's argv[0] parameter. This can be useful to show 900 * more descriptive information in things like the 'ps' command. 901 * 902 * @param text The new name of this process. 903 * 904 * {@hide} 905 */ 906 public static final native void setArgV0(String text); 907 908 /** 909 * Kill the process with the given PID. 910 * Note that, though this API allows us to request to 911 * kill any process based on its PID, the kernel will 912 * still impose standard restrictions on which PIDs you 913 * are actually able to kill. Typically this means only 914 * the process running the caller's packages/application 915 * and any additional processes created by that app; packages 916 * sharing a common UID will also be able to kill each 917 * other's processes. 918 */ 919 public static final void killProcess(int pid) { 920 sendSignal(pid, SIGNAL_KILL); 921 } 922 923 /** @hide */ 924 public static final native int setUid(int uid); 925 926 /** @hide */ 927 public static final native int setGid(int uid); 928 929 /** 930 * Send a signal to the given process. 931 * 932 * @param pid The pid of the target process. 933 * @param signal The signal to send. 934 */ 935 public static final native void sendSignal(int pid, int signal); 936 937 /** 938 * @hide 939 * Private impl for avoiding a log message... DO NOT USE without doing 940 * your own log, or the Android Illuminati will find you some night and 941 * beat you up. 942 */ 943 public static final void killProcessQuiet(int pid) { 944 sendSignalQuiet(pid, SIGNAL_KILL); 945 } 946 947 /** 948 * @hide 949 * Private impl for avoiding a log message... DO NOT USE without doing 950 * your own log, or the Android Illuminati will find you some night and 951 * beat you up. 952 */ 953 public static final native void sendSignalQuiet(int pid, int signal); 954 955 /** @hide */ 956 public static final native long getFreeMemory(); 957 958 /** @hide */ 959 public static final native long getTotalMemory(); 960 961 /** @hide */ 962 public static final native void readProcLines(String path, 963 String[] reqFields, long[] outSizes); 964 965 /** @hide */ 966 public static final native int[] getPids(String path, int[] lastArray); 967 968 /** @hide */ 969 public static final int PROC_TERM_MASK = 0xff; 970 /** @hide */ 971 public static final int PROC_ZERO_TERM = 0; 972 /** @hide */ 973 public static final int PROC_SPACE_TERM = (int)' '; 974 /** @hide */ 975 public static final int PROC_TAB_TERM = (int)'\t'; 976 /** @hide */ 977 public static final int PROC_COMBINE = 0x100; 978 /** @hide */ 979 public static final int PROC_PARENS = 0x200; 980 /** @hide */ 981 public static final int PROC_OUT_STRING = 0x1000; 982 /** @hide */ 983 public static final int PROC_OUT_LONG = 0x2000; 984 /** @hide */ 985 public static final int PROC_OUT_FLOAT = 0x4000; 986 987 /** @hide */ 988 public static final native boolean readProcFile(String file, int[] format, 989 String[] outStrings, long[] outLongs, float[] outFloats); 990 991 /** @hide */ 992 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 993 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 994 995 /** @hide */ 996 public static final native int[] getPidsForCommands(String[] cmds); 997 998 /** 999 * Gets the total Pss value for a given process, in bytes. 1000 * 1001 * @param pid the process to the Pss for 1002 * @return the total Pss value for the given process in bytes, 1003 * or -1 if the value cannot be determined 1004 * @hide 1005 */ 1006 public static final native long getPss(int pid); 1007 1008 /** 1009 * Specifies the outcome of having started a process. 1010 * @hide 1011 */ 1012 public static final class ProcessStartResult { 1013 /** 1014 * The PID of the newly started process. 1015 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1016 */ 1017 public int pid; 1018 1019 /** 1020 * True if the process was started with a wrapper attached. 1021 */ 1022 public boolean usingWrapper; 1023 } 1024} 1025