Process.java revision ae017c55824ca345186b0c9fc204401153bd8a23
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 GID for the group that allows write access to the internal media storage. 120 * @hide 121 */ 122 public static final int MEDIA_RW_GID = 1023; 123 124 /** 125 * Defines the start of a range of UIDs (and GIDs), going from this 126 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 127 * to applications. 128 */ 129 public static final int FIRST_APPLICATION_UID = 10000; 130 /** 131 * Last of application-specific UIDs starting at 132 * {@link #FIRST_APPLICATION_UID}. 133 */ 134 public static final int LAST_APPLICATION_UID = 19999; 135 136 /** 137 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 138 * @hide 139 */ 140 public static final int FIRST_ISOLATED_UID = 99000; 141 142 /** 143 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 144 * @hide 145 */ 146 public static final int LAST_ISOLATED_UID = 99999; 147 148 /** 149 * Defines a secondary group id for access to the bluetooth hardware. 150 */ 151 public static final int BLUETOOTH_GID = 2000; 152 153 /** 154 * Standard priority of application threads. 155 * Use with {@link #setThreadPriority(int)} and 156 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 157 * {@link java.lang.Thread} class. 158 */ 159 public static final int THREAD_PRIORITY_DEFAULT = 0; 160 161 /* 162 * *************************************** 163 * ** Keep in sync with utils/threads.h ** 164 * *************************************** 165 */ 166 167 /** 168 * Lowest available thread priority. Only for those who really, really 169 * don't want to run if anything else is happening. 170 * Use with {@link #setThreadPriority(int)} and 171 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 172 * {@link java.lang.Thread} class. 173 */ 174 public static final int THREAD_PRIORITY_LOWEST = 19; 175 176 /** 177 * Standard priority background threads. This gives your thread a slightly 178 * lower than normal priority, so that it will have less chance of impacting 179 * the responsiveness of the user interface. 180 * Use with {@link #setThreadPriority(int)} and 181 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 182 * {@link java.lang.Thread} class. 183 */ 184 public static final int THREAD_PRIORITY_BACKGROUND = 10; 185 186 /** 187 * Standard priority of threads that are currently running a user interface 188 * that the user is interacting with. Applications can not normally 189 * change to this priority; the system will automatically adjust your 190 * application threads as the user moves through the UI. 191 * Use with {@link #setThreadPriority(int)} and 192 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 193 * {@link java.lang.Thread} class. 194 */ 195 public static final int THREAD_PRIORITY_FOREGROUND = -2; 196 197 /** 198 * Standard priority of system display threads, involved in updating 199 * the user interface. Applications can not 200 * normally change to this priority. 201 * Use with {@link #setThreadPriority(int)} and 202 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 203 * {@link java.lang.Thread} class. 204 */ 205 public static final int THREAD_PRIORITY_DISPLAY = -4; 206 207 /** 208 * Standard priority of the most important display threads, for compositing 209 * the screen and retrieving input events. Applications can not normally 210 * change to this priority. 211 * Use with {@link #setThreadPriority(int)} and 212 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 213 * {@link java.lang.Thread} class. 214 */ 215 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 216 217 /** 218 * Standard priority of audio threads. Applications can not normally 219 * change to this priority. 220 * Use with {@link #setThreadPriority(int)} and 221 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 222 * {@link java.lang.Thread} class. 223 */ 224 public static final int THREAD_PRIORITY_AUDIO = -16; 225 226 /** 227 * Standard priority of the most important audio threads. 228 * Applications can not normally change to this priority. 229 * Use with {@link #setThreadPriority(int)} and 230 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 231 * {@link java.lang.Thread} class. 232 */ 233 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 234 235 /** 236 * Minimum increment to make a priority more favorable. 237 */ 238 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 239 240 /** 241 * Minimum increment to make a priority less favorable. 242 */ 243 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 244 245 /** 246 * Default scheduling policy 247 * @hide 248 */ 249 public static final int SCHED_OTHER = 0; 250 251 /** 252 * First-In First-Out scheduling policy 253 * @hide 254 */ 255 public static final int SCHED_FIFO = 1; 256 257 /** 258 * Round-Robin scheduling policy 259 * @hide 260 */ 261 public static final int SCHED_RR = 2; 262 263 /** 264 * Batch scheduling policy 265 * @hide 266 */ 267 public static final int SCHED_BATCH = 3; 268 269 /** 270 * Idle scheduling policy 271 * @hide 272 */ 273 public static final int SCHED_IDLE = 5; 274 275 // Keep in sync with SP_* constants of enum type SchedPolicy 276 // declared in system/core/include/cutils/sched_policy.h, 277 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 278 279 /** 280 * Default thread group - 281 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 282 * When used with setProcessGroup(), the group of each thread in the process 283 * is conditionally changed based on that thread's current priority, as follows: 284 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 285 * are moved to foreground thread group. All other threads are left unchanged. 286 * @hide 287 */ 288 public static final int THREAD_GROUP_DEFAULT = -1; 289 290 /** 291 * Background thread group - All threads in 292 * this group are scheduled with a reduced share of the CPU. 293 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 294 * FIXME rename to THREAD_GROUP_BACKGROUND. 295 * @hide 296 */ 297 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 298 299 /** 300 * Foreground thread group - All threads in 301 * this group are scheduled with a normal share of the CPU. 302 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 303 * Not used at this level. 304 * @hide 305 **/ 306 private static final int THREAD_GROUP_FOREGROUND = 1; 307 308 /** 309 * System thread group. 310 * @hide 311 **/ 312 public static final int THREAD_GROUP_SYSTEM = 2; 313 314 /** 315 * Application audio thread group. 316 * @hide 317 **/ 318 public static final int THREAD_GROUP_AUDIO_APP = 3; 319 320 /** 321 * System audio thread group. 322 * @hide 323 **/ 324 public static final int THREAD_GROUP_AUDIO_SYS = 4; 325 326 public static final int SIGNAL_QUIT = 3; 327 public static final int SIGNAL_KILL = 9; 328 public static final int SIGNAL_USR1 = 10; 329 330 // State for communicating with zygote process 331 332 static LocalSocket sZygoteSocket; 333 static DataInputStream sZygoteInputStream; 334 static BufferedWriter sZygoteWriter; 335 336 /** true if previous zygote open failed */ 337 static boolean sPreviousZygoteOpenFailed; 338 339 /** 340 * Start a new process. 341 * 342 * <p>If processes are enabled, a new process is created and the 343 * static main() function of a <var>processClass</var> is executed there. 344 * The process will continue running after this function returns. 345 * 346 * <p>If processes are not enabled, a new thread in the caller's 347 * process is created and main() of <var>processClass</var> called there. 348 * 349 * <p>The niceName parameter, if not an empty string, is a custom name to 350 * give to the process instead of using processClass. This allows you to 351 * make easily identifyable processes even if you are using the same base 352 * <var>processClass</var> to start them. 353 * 354 * @param processClass The class to use as the process's main entry 355 * point. 356 * @param niceName A more readable name to use for the process. 357 * @param uid The user-id under which the process will run. 358 * @param gid The group-id under which the process will run. 359 * @param gids Additional group-ids associated with the process. 360 * @param debugFlags Additional flags. 361 * @param targetSdkVersion The target SDK version for the app. 362 * @param seInfo null-ok SE Android information for the new process. 363 * @param zygoteArgs Additional arguments to supply to the zygote process. 364 * 365 * @return An object that describes the result of the attempt to start the process. 366 * @throws RuntimeException on fatal start failure 367 * 368 * {@hide} 369 */ 370 public static final ProcessStartResult start(final String processClass, 371 final String niceName, 372 int uid, int gid, int[] gids, 373 int debugFlags, int targetSdkVersion, 374 String seInfo, 375 String[] zygoteArgs) { 376 try { 377 return startViaZygote(processClass, niceName, uid, gid, gids, 378 debugFlags, targetSdkVersion, seInfo, zygoteArgs); 379 } catch (ZygoteStartFailedEx ex) { 380 Log.e(LOG_TAG, 381 "Starting VM process through Zygote failed"); 382 throw new RuntimeException( 383 "Starting VM process through Zygote failed", ex); 384 } 385 } 386 387 /** retry interval for opening a zygote socket */ 388 static final int ZYGOTE_RETRY_MILLIS = 500; 389 390 /** 391 * Tries to open socket to Zygote process if not already open. If 392 * already open, does nothing. May block and retry. 393 */ 394 private static void openZygoteSocketIfNeeded() 395 throws ZygoteStartFailedEx { 396 397 int retryCount; 398 399 if (sPreviousZygoteOpenFailed) { 400 /* 401 * If we've failed before, expect that we'll fail again and 402 * don't pause for retries. 403 */ 404 retryCount = 0; 405 } else { 406 retryCount = 10; 407 } 408 409 /* 410 * See bug #811181: Sometimes runtime can make it up before zygote. 411 * Really, we'd like to do something better to avoid this condition, 412 * but for now just wait a bit... 413 */ 414 for (int retry = 0 415 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 416 ; retry++ ) { 417 418 if (retry > 0) { 419 try { 420 Log.i("Zygote", "Zygote not up yet, sleeping..."); 421 Thread.sleep(ZYGOTE_RETRY_MILLIS); 422 } catch (InterruptedException ex) { 423 // should never happen 424 } 425 } 426 427 try { 428 sZygoteSocket = new LocalSocket(); 429 430 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 431 LocalSocketAddress.Namespace.RESERVED)); 432 433 sZygoteInputStream 434 = new DataInputStream(sZygoteSocket.getInputStream()); 435 436 sZygoteWriter = 437 new BufferedWriter( 438 new OutputStreamWriter( 439 sZygoteSocket.getOutputStream()), 440 256); 441 442 Log.i("Zygote", "Process: zygote socket opened"); 443 444 sPreviousZygoteOpenFailed = false; 445 break; 446 } catch (IOException ex) { 447 if (sZygoteSocket != null) { 448 try { 449 sZygoteSocket.close(); 450 } catch (IOException ex2) { 451 Log.e(LOG_TAG,"I/O exception on close after exception", 452 ex2); 453 } 454 } 455 456 sZygoteSocket = null; 457 } 458 } 459 460 if (sZygoteSocket == null) { 461 sPreviousZygoteOpenFailed = true; 462 throw new ZygoteStartFailedEx("connect failed"); 463 } 464 } 465 466 /** 467 * Sends an argument list to the zygote process, which starts a new child 468 * and returns the child's pid. Please note: the present implementation 469 * replaces newlines in the argument list with spaces. 470 * @param args argument list 471 * @return An object that describes the result of the attempt to start the process. 472 * @throws ZygoteStartFailedEx if process start failed for any reason 473 */ 474 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 475 throws ZygoteStartFailedEx { 476 openZygoteSocketIfNeeded(); 477 478 try { 479 /** 480 * See com.android.internal.os.ZygoteInit.readArgumentList() 481 * Presently the wire format to the zygote process is: 482 * a) a count of arguments (argc, in essence) 483 * b) a number of newline-separated argument strings equal to count 484 * 485 * After the zygote process reads these it will write the pid of 486 * the child or -1 on failure, followed by boolean to 487 * indicate whether a wrapper process was used. 488 */ 489 490 sZygoteWriter.write(Integer.toString(args.size())); 491 sZygoteWriter.newLine(); 492 493 int sz = args.size(); 494 for (int i = 0; i < sz; i++) { 495 String arg = args.get(i); 496 if (arg.indexOf('\n') >= 0) { 497 throw new ZygoteStartFailedEx( 498 "embedded newlines not allowed"); 499 } 500 sZygoteWriter.write(arg); 501 sZygoteWriter.newLine(); 502 } 503 504 sZygoteWriter.flush(); 505 506 // Should there be a timeout on this? 507 ProcessStartResult result = new ProcessStartResult(); 508 result.pid = sZygoteInputStream.readInt(); 509 if (result.pid < 0) { 510 throw new ZygoteStartFailedEx("fork() failed"); 511 } 512 result.usingWrapper = sZygoteInputStream.readBoolean(); 513 return result; 514 } catch (IOException ex) { 515 try { 516 if (sZygoteSocket != null) { 517 sZygoteSocket.close(); 518 } 519 } catch (IOException ex2) { 520 // we're going to fail anyway 521 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 522 } 523 524 sZygoteSocket = null; 525 526 throw new ZygoteStartFailedEx(ex); 527 } 528 } 529 530 /** 531 * Starts a new process via the zygote mechanism. 532 * 533 * @param processClass Class name whose static main() to run 534 * @param niceName 'nice' process name to appear in ps 535 * @param uid a POSIX uid that the new process should setuid() to 536 * @param gid a POSIX gid that the new process shuold setgid() to 537 * @param gids null-ok; a list of supplementary group IDs that the 538 * new process should setgroup() to. 539 * @param debugFlags Additional flags. 540 * @param targetSdkVersion The target SDK version for the app. 541 * @param seInfo null-ok SE Android information for the new process. 542 * @param extraArgs Additional arguments to supply to the zygote process. 543 * @return An object that describes the result of the attempt to start the process. 544 * @throws ZygoteStartFailedEx if process start failed for any reason 545 */ 546 private static ProcessStartResult startViaZygote(final String processClass, 547 final String niceName, 548 final int uid, final int gid, 549 final int[] gids, 550 int debugFlags, int targetSdkVersion, 551 String seInfo, 552 String[] extraArgs) 553 throws ZygoteStartFailedEx { 554 synchronized(Process.class) { 555 ArrayList<String> argsForZygote = new ArrayList<String>(); 556 557 // --runtime-init, --setuid=, --setgid=, 558 // and --setgroups= must go first 559 argsForZygote.add("--runtime-init"); 560 argsForZygote.add("--setuid=" + uid); 561 argsForZygote.add("--setgid=" + gid); 562 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 563 argsForZygote.add("--enable-jni-logging"); 564 } 565 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 566 argsForZygote.add("--enable-safemode"); 567 } 568 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 569 argsForZygote.add("--enable-debugger"); 570 } 571 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 572 argsForZygote.add("--enable-checkjni"); 573 } 574 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 575 argsForZygote.add("--enable-assert"); 576 } 577 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 578 579 //TODO optionally enable debuger 580 //argsForZygote.add("--enable-debugger"); 581 582 // --setgroups is a comma-separated list 583 if (gids != null && gids.length > 0) { 584 StringBuilder sb = new StringBuilder(); 585 sb.append("--setgroups="); 586 587 int sz = gids.length; 588 for (int i = 0; i < sz; i++) { 589 if (i != 0) { 590 sb.append(','); 591 } 592 sb.append(gids[i]); 593 } 594 595 argsForZygote.add(sb.toString()); 596 } 597 598 if (niceName != null) { 599 argsForZygote.add("--nice-name=" + niceName); 600 } 601 602 if (seInfo != null) { 603 argsForZygote.add("--seinfo=" + seInfo); 604 } 605 606 argsForZygote.add(processClass); 607 608 if (extraArgs != null) { 609 for (String arg : extraArgs) { 610 argsForZygote.add(arg); 611 } 612 } 613 614 return zygoteSendArgsAndGetResult(argsForZygote); 615 } 616 } 617 618 /** 619 * Returns elapsed milliseconds of the time this process has run. 620 * @return Returns the number of milliseconds this process has return. 621 */ 622 public static final native long getElapsedCpuTime(); 623 624 /** 625 * Returns the identifier of this process, which can be used with 626 * {@link #killProcess} and {@link #sendSignal}. 627 */ 628 public static final native int myPid(); 629 630 /** 631 * Returns the identifier of the calling thread, which be used with 632 * {@link #setThreadPriority(int, int)}. 633 */ 634 public static final native int myTid(); 635 636 /** 637 * Returns the identifier of this process's user. 638 */ 639 public static final native int myUid(); 640 641 /** 642 * Returns whether the current process is in an isolated sandbox. 643 * @hide 644 */ 645 public static final boolean isIsolated() { 646 int uid = UserId.getAppId(myUid()); 647 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 648 } 649 650 /** 651 * Returns the UID assigned to a particular user name, or -1 if there is 652 * none. If the given string consists of only numbers, it is converted 653 * directly to a uid. 654 */ 655 public static final native int getUidForName(String name); 656 657 /** 658 * Returns the GID assigned to a particular user name, or -1 if there is 659 * none. If the given string consists of only numbers, it is converted 660 * directly to a gid. 661 */ 662 public static final native int getGidForName(String name); 663 664 /** 665 * Returns a uid for a currently running process. 666 * @param pid the process id 667 * @return the uid of the process, or -1 if the process is not running. 668 * @hide pending API council review 669 */ 670 public static final int getUidForPid(int pid) { 671 String[] procStatusLabels = { "Uid:" }; 672 long[] procStatusValues = new long[1]; 673 procStatusValues[0] = -1; 674 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 675 return (int) procStatusValues[0]; 676 } 677 678 /** 679 * Returns the parent process id for a currently running process. 680 * @param pid the process id 681 * @return the parent process id of the process, or -1 if the process is not running. 682 * @hide 683 */ 684 public static final int getParentPid(int pid) { 685 String[] procStatusLabels = { "PPid:" }; 686 long[] procStatusValues = new long[1]; 687 procStatusValues[0] = -1; 688 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 689 return (int) procStatusValues[0]; 690 } 691 692 /** 693 * Returns the thread group leader id for a currently running thread. 694 * @param tid the thread id 695 * @return the thread group leader id of the thread, or -1 if the thread is not running. 696 * This is same as what getpid(2) would return if called by tid. 697 * @hide 698 */ 699 public static final int getThreadGroupLeader(int tid) { 700 String[] procStatusLabels = { "Tgid:" }; 701 long[] procStatusValues = new long[1]; 702 procStatusValues[0] = -1; 703 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 704 return (int) procStatusValues[0]; 705 } 706 707 /** 708 * Set the priority of a thread, based on Linux priorities. 709 * 710 * @param tid The identifier of the thread/process to change. 711 * @param priority A Linux priority level, from -20 for highest scheduling 712 * priority to 19 for lowest scheduling priority. 713 * 714 * @throws IllegalArgumentException Throws IllegalArgumentException if 715 * <var>tid</var> does not exist. 716 * @throws SecurityException Throws SecurityException if your process does 717 * not have permission to modify the given thread, or to use the given 718 * priority. 719 */ 720 public static final native void setThreadPriority(int tid, int priority) 721 throws IllegalArgumentException, SecurityException; 722 723 /** 724 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 725 * throw an exception if passed a background-level thread priority. This is only 726 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 727 * 728 * @hide 729 */ 730 public static final native void setCanSelfBackground(boolean backgroundOk); 731 732 /** 733 * Sets the scheduling group for a thread. 734 * @hide 735 * @param tid The identifier of the thread to change. 736 * @param group The target group for this thread from THREAD_GROUP_*. 737 * 738 * @throws IllegalArgumentException Throws IllegalArgumentException if 739 * <var>tid</var> does not exist. 740 * @throws SecurityException Throws SecurityException if your process does 741 * not have permission to modify the given thread, or to use the given 742 * priority. 743 * If the thread is a thread group leader, that is it's gettid() == getpid(), 744 * then the other threads in the same thread group are _not_ affected. 745 */ 746 public static final native void setThreadGroup(int tid, int group) 747 throws IllegalArgumentException, SecurityException; 748 749 /** 750 * Sets the scheduling group for a process and all child threads 751 * @hide 752 * @param pid The identifier of the process to change. 753 * @param group The target group for this process from THREAD_GROUP_*. 754 * 755 * @throws IllegalArgumentException Throws IllegalArgumentException if 756 * <var>tid</var> does not exist. 757 * @throws SecurityException Throws SecurityException if your process does 758 * not have permission to modify the given thread, or to use the given 759 * priority. 760 * 761 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 762 * threads to the foreground scheduling group, but to leave background 763 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 764 * threads, regardless of priority, to the background scheduling group. 765 * group == THREAD_GROUP_FOREGROUND is not allowed. 766 */ 767 public static final native void setProcessGroup(int pid, int group) 768 throws IllegalArgumentException, SecurityException; 769 770 /** 771 * Set the priority of the calling thread, based on Linux priorities. See 772 * {@link #setThreadPriority(int, int)} for more information. 773 * 774 * @param priority A Linux priority level, from -20 for highest scheduling 775 * priority to 19 for lowest scheduling priority. 776 * 777 * @throws IllegalArgumentException Throws IllegalArgumentException if 778 * <var>tid</var> does not exist. 779 * @throws SecurityException Throws SecurityException if your process does 780 * not have permission to modify the given thread, or to use the given 781 * priority. 782 * 783 * @see #setThreadPriority(int, int) 784 */ 785 public static final native void setThreadPriority(int priority) 786 throws IllegalArgumentException, SecurityException; 787 788 /** 789 * Return the current priority of a thread, based on Linux priorities. 790 * 791 * @param tid The identifier of the thread/process to change. 792 * 793 * @return Returns the current priority, as a Linux priority level, 794 * from -20 for highest scheduling priority to 19 for lowest scheduling 795 * priority. 796 * 797 * @throws IllegalArgumentException Throws IllegalArgumentException if 798 * <var>tid</var> does not exist. 799 */ 800 public static final native int getThreadPriority(int tid) 801 throws IllegalArgumentException; 802 803 /** 804 * Set the scheduling policy and priority of a thread, based on Linux. 805 * 806 * @param tid The identifier of the thread/process to change. 807 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 808 * @param priority A Linux priority level in a range appropriate for the given policy. 809 * 810 * @throws IllegalArgumentException Throws IllegalArgumentException if 811 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 812 * @throws SecurityException Throws SecurityException if your process does 813 * not have permission to modify the given thread, or to use the given 814 * scheduling policy or priority. 815 * 816 * {@hide} 817 */ 818 public static final native void setThreadScheduler(int tid, int policy, int priority) 819 throws IllegalArgumentException; 820 821 /** 822 * Determine whether the current environment supports multiple processes. 823 * 824 * @return Returns true if the system can run in multiple processes, else 825 * false if everything is running in a single process. 826 * 827 * @deprecated This method always returns true. Do not use. 828 */ 829 @Deprecated 830 public static final boolean supportsProcesses() { 831 return true; 832 } 833 834 /** 835 * Set the out-of-memory badness adjustment for a process. 836 * 837 * @param pid The process identifier to set. 838 * @param amt Adjustment value -- linux allows -16 to +15. 839 * 840 * @return Returns true if the underlying system supports this 841 * feature, else false. 842 * 843 * {@hide} 844 */ 845 public static final native boolean setOomAdj(int pid, int amt); 846 847 /** 848 * Change this process's argv[0] parameter. This can be useful to show 849 * more descriptive information in things like the 'ps' command. 850 * 851 * @param text The new name of this process. 852 * 853 * {@hide} 854 */ 855 public static final native void setArgV0(String text); 856 857 /** 858 * Kill the process with the given PID. 859 * Note that, though this API allows us to request to 860 * kill any process based on its PID, the kernel will 861 * still impose standard restrictions on which PIDs you 862 * are actually able to kill. Typically this means only 863 * the process running the caller's packages/application 864 * and any additional processes created by that app; packages 865 * sharing a common UID will also be able to kill each 866 * other's processes. 867 */ 868 public static final void killProcess(int pid) { 869 sendSignal(pid, SIGNAL_KILL); 870 } 871 872 /** @hide */ 873 public static final native int setUid(int uid); 874 875 /** @hide */ 876 public static final native int setGid(int uid); 877 878 /** 879 * Send a signal to the given process. 880 * 881 * @param pid The pid of the target process. 882 * @param signal The signal to send. 883 */ 884 public static final native void sendSignal(int pid, int signal); 885 886 /** 887 * @hide 888 * Private impl for avoiding a log message... DO NOT USE without doing 889 * your own log, or the Android Illuminati will find you some night and 890 * beat you up. 891 */ 892 public static final void killProcessQuiet(int pid) { 893 sendSignalQuiet(pid, SIGNAL_KILL); 894 } 895 896 /** 897 * @hide 898 * Private impl for avoiding a log message... DO NOT USE without doing 899 * your own log, or the Android Illuminati will find you some night and 900 * beat you up. 901 */ 902 public static final native void sendSignalQuiet(int pid, int signal); 903 904 /** @hide */ 905 public static final native long getFreeMemory(); 906 907 /** @hide */ 908 public static final native long getTotalMemory(); 909 910 /** @hide */ 911 public static final native void readProcLines(String path, 912 String[] reqFields, long[] outSizes); 913 914 /** @hide */ 915 public static final native int[] getPids(String path, int[] lastArray); 916 917 /** @hide */ 918 public static final int PROC_TERM_MASK = 0xff; 919 /** @hide */ 920 public static final int PROC_ZERO_TERM = 0; 921 /** @hide */ 922 public static final int PROC_SPACE_TERM = (int)' '; 923 /** @hide */ 924 public static final int PROC_TAB_TERM = (int)'\t'; 925 /** @hide */ 926 public static final int PROC_COMBINE = 0x100; 927 /** @hide */ 928 public static final int PROC_PARENS = 0x200; 929 /** @hide */ 930 public static final int PROC_OUT_STRING = 0x1000; 931 /** @hide */ 932 public static final int PROC_OUT_LONG = 0x2000; 933 /** @hide */ 934 public static final int PROC_OUT_FLOAT = 0x4000; 935 936 /** @hide */ 937 public static final native boolean readProcFile(String file, int[] format, 938 String[] outStrings, long[] outLongs, float[] outFloats); 939 940 /** @hide */ 941 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 942 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 943 944 /** @hide */ 945 public static final native int[] getPidsForCommands(String[] cmds); 946 947 /** 948 * Gets the total Pss value for a given process, in bytes. 949 * 950 * @param pid the process to the Pss for 951 * @return the total Pss value for the given process in bytes, 952 * or -1 if the value cannot be determined 953 * @hide 954 */ 955 public static final native long getPss(int pid); 956 957 /** 958 * Specifies the outcome of having started a process. 959 * @hide 960 */ 961 public static final class ProcessStartResult { 962 /** 963 * The PID of the newly started process. 964 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 965 */ 966 public int pid; 967 968 /** 969 * True if the process was started with a wrapper attached. 970 */ 971 public boolean usingWrapper; 972 } 973} 974