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.net.LocalSocketAddress; 20 import android.net.LocalSocket; 21 import android.util.Log; 22 import dalvik.system.Zygote; 23 24 import java.io.BufferedWriter; 25 import java.io.DataInputStream; 26 import java.io.IOException; 27 import java.io.OutputStreamWriter; 28 import 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 */ 43 public 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 zygoteArgs Additional arguments to supply to the zygote process. 363 * 364 * @return An object that describes the result of the attempt to start the process. 365 * @throws RuntimeException on fatal start failure 366 * 367 * {@hide} 368 */ 369 public static final ProcessStartResult start(final String processClass, 370 final String niceName, 371 int uid, int gid, int[] gids, 372 int debugFlags, int targetSdkVersion, 373 String[] zygoteArgs) { 374 try { 375 return startViaZygote(processClass, niceName, uid, gid, gids, 376 debugFlags, targetSdkVersion, zygoteArgs); 377 } catch (ZygoteStartFailedEx ex) { 378 Log.e(LOG_TAG, 379 "Starting VM process through Zygote failed"); 380 throw new RuntimeException( 381 "Starting VM process through Zygote failed", ex); 382 } 383 } 384 385 /** retry interval for opening a zygote socket */ 386 static final int ZYGOTE_RETRY_MILLIS = 500; 387 388 /** 389 * Tries to open socket to Zygote process if not already open. If 390 * already open, does nothing. May block and retry. 391 */ 392 private static void openZygoteSocketIfNeeded() 393 throws ZygoteStartFailedEx { 394 395 int retryCount; 396 397 if (sPreviousZygoteOpenFailed) { 398 /* 399 * If we've failed before, expect that we'll fail again and 400 * don't pause for retries. 401 */ 402 retryCount = 0; 403 } else { 404 retryCount = 10; 405 } 406 407 /* 408 * See bug #811181: Sometimes runtime can make it up before zygote. 409 * Really, we'd like to do something better to avoid this condition, 410 * but for now just wait a bit... 411 */ 412 for (int retry = 0 413 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 414 ; retry++ ) { 415 416 if (retry > 0) { 417 try { 418 Log.i("Zygote", "Zygote not up yet, sleeping..."); 419 Thread.sleep(ZYGOTE_RETRY_MILLIS); 420 } catch (InterruptedException ex) { 421 // should never happen 422 } 423 } 424 425 try { 426 sZygoteSocket = new LocalSocket(); 427 428 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 429 LocalSocketAddress.Namespace.RESERVED)); 430 431 sZygoteInputStream 432 = new DataInputStream(sZygoteSocket.getInputStream()); 433 434 sZygoteWriter = 435 new BufferedWriter( 436 new OutputStreamWriter( 437 sZygoteSocket.getOutputStream()), 438 256); 439 440 Log.i("Zygote", "Process: zygote socket opened"); 441 442 sPreviousZygoteOpenFailed = false; 443 break; 444 } catch (IOException ex) { 445 if (sZygoteSocket != null) { 446 try { 447 sZygoteSocket.close(); 448 } catch (IOException ex2) { 449 Log.e(LOG_TAG,"I/O exception on close after exception", 450 ex2); 451 } 452 } 453 454 sZygoteSocket = null; 455 } 456 } 457 458 if (sZygoteSocket == null) { 459 sPreviousZygoteOpenFailed = true; 460 throw new ZygoteStartFailedEx("connect failed"); 461 } 462 } 463 464 /** 465 * Sends an argument list to the zygote process, which starts a new child 466 * and returns the child's pid. Please note: the present implementation 467 * replaces newlines in the argument list with spaces. 468 * @param args argument list 469 * @return An object that describes the result of the attempt to start the process. 470 * @throws ZygoteStartFailedEx if process start failed for any reason 471 */ 472 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 473 throws ZygoteStartFailedEx { 474 openZygoteSocketIfNeeded(); 475 476 try { 477 /** 478 * See com.android.internal.os.ZygoteInit.readArgumentList() 479 * Presently the wire format to the zygote process is: 480 * a) a count of arguments (argc, in essence) 481 * b) a number of newline-separated argument strings equal to count 482 * 483 * After the zygote process reads these it will write the pid of 484 * the child or -1 on failure, followed by boolean to 485 * indicate whether a wrapper process was used. 486 */ 487 488 sZygoteWriter.write(Integer.toString(args.size())); 489 sZygoteWriter.newLine(); 490 491 int sz = args.size(); 492 for (int i = 0; i < sz; i++) { 493 String arg = args.get(i); 494 if (arg.indexOf('\n') >= 0) { 495 throw new ZygoteStartFailedEx( 496 "embedded newlines not allowed"); 497 } 498 sZygoteWriter.write(arg); 499 sZygoteWriter.newLine(); 500 } 501 502 sZygoteWriter.flush(); 503 504 // Should there be a timeout on this? 505 ProcessStartResult result = new ProcessStartResult(); 506 result.pid = sZygoteInputStream.readInt(); 507 if (result.pid < 0) { 508 throw new ZygoteStartFailedEx("fork() failed"); 509 } 510 result.usingWrapper = sZygoteInputStream.readBoolean(); 511 return result; 512 } catch (IOException ex) { 513 try { 514 if (sZygoteSocket != null) { 515 sZygoteSocket.close(); 516 } 517 } catch (IOException ex2) { 518 // we're going to fail anyway 519 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 520 } 521 522 sZygoteSocket = null; 523 524 throw new ZygoteStartFailedEx(ex); 525 } 526 } 527 528 /** 529 * Starts a new process via the zygote mechanism. 530 * 531 * @param processClass Class name whose static main() to run 532 * @param niceName 'nice' process name to appear in ps 533 * @param uid a POSIX uid that the new process should setuid() to 534 * @param gid a POSIX gid that the new process shuold setgid() to 535 * @param gids null-ok; a list of supplementary group IDs that the 536 * new process should setgroup() to. 537 * @param debugFlags Additional flags. 538 * @param targetSdkVersion The target SDK version for the app. 539 * @param extraArgs Additional arguments to supply to the zygote process. 540 * @return An object that describes the result of the attempt to start the process. 541 * @throws ZygoteStartFailedEx if process start failed for any reason 542 */ 543 private static ProcessStartResult startViaZygote(final String processClass, 544 final String niceName, 545 final int uid, final int gid, 546 final int[] gids, 547 int debugFlags, int targetSdkVersion, 548 String[] extraArgs) 549 throws ZygoteStartFailedEx { 550 synchronized(Process.class) { 551 ArrayList<String> argsForZygote = new ArrayList<String>(); 552 553 // --runtime-init, --setuid=, --setgid=, 554 // and --setgroups= must go first 555 argsForZygote.add("--runtime-init"); 556 argsForZygote.add("--setuid=" + uid); 557 argsForZygote.add("--setgid=" + gid); 558 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 559 argsForZygote.add("--enable-jni-logging"); 560 } 561 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 562 argsForZygote.add("--enable-safemode"); 563 } 564 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 565 argsForZygote.add("--enable-debugger"); 566 } 567 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 568 argsForZygote.add("--enable-checkjni"); 569 } 570 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 571 argsForZygote.add("--enable-assert"); 572 } 573 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 574 575 //TODO optionally enable debuger 576 //argsForZygote.add("--enable-debugger"); 577 578 // --setgroups is a comma-separated list 579 if (gids != null && gids.length > 0) { 580 StringBuilder sb = new StringBuilder(); 581 sb.append("--setgroups="); 582 583 int sz = gids.length; 584 for (int i = 0; i < sz; i++) { 585 if (i != 0) { 586 sb.append(','); 587 } 588 sb.append(gids[i]); 589 } 590 591 argsForZygote.add(sb.toString()); 592 } 593 594 if (niceName != null) { 595 argsForZygote.add("--nice-name=" + niceName); 596 } 597 598 argsForZygote.add(processClass); 599 600 if (extraArgs != null) { 601 for (String arg : extraArgs) { 602 argsForZygote.add(arg); 603 } 604 } 605 606 return zygoteSendArgsAndGetResult(argsForZygote); 607 } 608 } 609 610 /** 611 * Returns elapsed milliseconds of the time this process has run. 612 * @return Returns the number of milliseconds this process has return. 613 */ 614 public static final native long getElapsedCpuTime(); 615 616 /** 617 * Returns the identifier of this process, which can be used with 618 * {@link #killProcess} and {@link #sendSignal}. 619 */ 620 public static final native int myPid(); 621 622 /** 623 * Returns the identifier of the calling thread, which be used with 624 * {@link #setThreadPriority(int, int)}. 625 */ 626 public static final native int myTid(); 627 628 /** 629 * Returns the identifier of this process's user. 630 */ 631 public static final native int myUid(); 632 633 /** 634 * Returns whether the current process is in an isolated sandbox. 635 * @hide 636 */ 637 public static final boolean isIsolated() { 638 int uid = UserId.getAppId(myUid()); 639 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 640 } 641 642 /** 643 * Returns the UID assigned to a particular user name, or -1 if there is 644 * none. If the given string consists of only numbers, it is converted 645 * directly to a uid. 646 */ 647 public static final native int getUidForName(String name); 648 649 /** 650 * Returns the GID assigned to a particular user name, or -1 if there is 651 * none. If the given string consists of only numbers, it is converted 652 * directly to a gid. 653 */ 654 public static final native int getGidForName(String name); 655 656 /** 657 * Returns a uid for a currently running process. 658 * @param pid the process id 659 * @return the uid of the process, or -1 if the process is not running. 660 * @hide pending API council review 661 */ 662 public static final int getUidForPid(int pid) { 663 String[] procStatusLabels = { "Uid:" }; 664 long[] procStatusValues = new long[1]; 665 procStatusValues[0] = -1; 666 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 667 return (int) procStatusValues[0]; 668 } 669 670 /** 671 * Returns the parent process id for a currently running process. 672 * @param pid the process id 673 * @return the parent process id of the process, or -1 if the process is not running. 674 * @hide 675 */ 676 public static final int getParentPid(int pid) { 677 String[] procStatusLabels = { "PPid:" }; 678 long[] procStatusValues = new long[1]; 679 procStatusValues[0] = -1; 680 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 681 return (int) procStatusValues[0]; 682 } 683 684 /** 685 * Returns the thread group leader id for a currently running thread. 686 * @param tid the thread id 687 * @return the thread group leader id of the thread, or -1 if the thread is not running. 688 * This is same as what getpid(2) would return if called by tid. 689 * @hide 690 */ 691 public static final int getThreadGroupLeader(int tid) { 692 String[] procStatusLabels = { "Tgid:" }; 693 long[] procStatusValues = new long[1]; 694 procStatusValues[0] = -1; 695 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 696 return (int) procStatusValues[0]; 697 } 698 699 /** 700 * Set the priority of a thread, based on Linux priorities. 701 * 702 * @param tid The identifier of the thread/process to change. 703 * @param priority A Linux priority level, from -20 for highest scheduling 704 * priority to 19 for lowest scheduling priority. 705 * 706 * @throws IllegalArgumentException Throws IllegalArgumentException if 707 * <var>tid</var> does not exist. 708 * @throws SecurityException Throws SecurityException if your process does 709 * not have permission to modify the given thread, or to use the given 710 * priority. 711 */ 712 public static final native void setThreadPriority(int tid, int priority) 713 throws IllegalArgumentException, SecurityException; 714 715 /** 716 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 717 * throw an exception if passed a background-level thread priority. This is only 718 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 719 * 720 * @hide 721 */ 722 public static final native void setCanSelfBackground(boolean backgroundOk); 723 724 /** 725 * Sets the scheduling group for a thread. 726 * @hide 727 * @param tid The identifier of the thread to change. 728 * @param group The target group for this thread from THREAD_GROUP_*. 729 * 730 * @throws IllegalArgumentException Throws IllegalArgumentException if 731 * <var>tid</var> does not exist. 732 * @throws SecurityException Throws SecurityException if your process does 733 * not have permission to modify the given thread, or to use the given 734 * priority. 735 * If the thread is a thread group leader, that is it's gettid() == getpid(), 736 * then the other threads in the same thread group are _not_ affected. 737 */ 738 public static final native void setThreadGroup(int tid, int group) 739 throws IllegalArgumentException, SecurityException; 740 741 /** 742 * Sets the scheduling group for a process and all child threads 743 * @hide 744 * @param pid The identifier of the process to change. 745 * @param group The target group for this process from THREAD_GROUP_*. 746 * 747 * @throws IllegalArgumentException Throws IllegalArgumentException if 748 * <var>tid</var> does not exist. 749 * @throws SecurityException Throws SecurityException if your process does 750 * not have permission to modify the given thread, or to use the given 751 * priority. 752 * 753 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 754 * threads to the foreground scheduling group, but to leave background 755 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 756 * threads, regardless of priority, to the background scheduling group. 757 * group == THREAD_GROUP_FOREGROUND is not allowed. 758 */ 759 public static final native void setProcessGroup(int pid, int group) 760 throws IllegalArgumentException, SecurityException; 761 762 /** 763 * Set the priority of the calling thread, based on Linux priorities. See 764 * {@link #setThreadPriority(int, int)} for more information. 765 * 766 * @param priority A Linux priority level, from -20 for highest scheduling 767 * priority to 19 for lowest scheduling priority. 768 * 769 * @throws IllegalArgumentException Throws IllegalArgumentException if 770 * <var>tid</var> does not exist. 771 * @throws SecurityException Throws SecurityException if your process does 772 * not have permission to modify the given thread, or to use the given 773 * priority. 774 * 775 * @see #setThreadPriority(int, int) 776 */ 777 public static final native void setThreadPriority(int priority) 778 throws IllegalArgumentException, SecurityException; 779 780 /** 781 * Return the current priority of a thread, based on Linux priorities. 782 * 783 * @param tid The identifier of the thread/process to change. 784 * 785 * @return Returns the current priority, as a Linux priority level, 786 * from -20 for highest scheduling priority to 19 for lowest scheduling 787 * priority. 788 * 789 * @throws IllegalArgumentException Throws IllegalArgumentException if 790 * <var>tid</var> does not exist. 791 */ 792 public static final native int getThreadPriority(int tid) 793 throws IllegalArgumentException; 794 795 /** 796 * Set the scheduling policy and priority of a thread, based on Linux. 797 * 798 * @param tid The identifier of the thread/process to change. 799 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 800 * @param priority A Linux priority level in a range appropriate for the given policy. 801 * 802 * @throws IllegalArgumentException Throws IllegalArgumentException if 803 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 804 * @throws SecurityException Throws SecurityException if your process does 805 * not have permission to modify the given thread, or to use the given 806 * scheduling policy or priority. 807 * 808 * {@hide} 809 */ 810 public static final native void setThreadScheduler(int tid, int policy, int priority) 811 throws IllegalArgumentException; 812 813 /** 814 * Determine whether the current environment supports multiple processes. 815 * 816 * @return Returns true if the system can run in multiple processes, else 817 * false if everything is running in a single process. 818 * 819 * @deprecated This method always returns true. Do not use. 820 */ 821 @Deprecated 822 public static final boolean supportsProcesses() { 823 return true; 824 } 825 826 /** 827 * Set the out-of-memory badness adjustment for a process. 828 * 829 * @param pid The process identifier to set. 830 * @param amt Adjustment value -- linux allows -16 to +15. 831 * 832 * @return Returns true if the underlying system supports this 833 * feature, else false. 834 * 835 * {@hide} 836 */ 837 public static final native boolean setOomAdj(int pid, int amt); 838 839 /** 840 * Change this process's argv[0] parameter. This can be useful to show 841 * more descriptive information in things like the 'ps' command. 842 * 843 * @param text The new name of this process. 844 * 845 * {@hide} 846 */ 847 public static final native void setArgV0(String text); 848 849 /** 850 * Kill the process with the given PID. 851 * Note that, though this API allows us to request to 852 * kill any process based on its PID, the kernel will 853 * still impose standard restrictions on which PIDs you 854 * are actually able to kill. Typically this means only 855 * the process running the caller's packages/application 856 * and any additional processes created by that app; packages 857 * sharing a common UID will also be able to kill each 858 * other's processes. 859 */ 860 public static final void killProcess(int pid) { 861 sendSignal(pid, SIGNAL_KILL); 862 } 863 864 /** @hide */ 865 public static final native int setUid(int uid); 866 867 /** @hide */ 868 public static final native int setGid(int uid); 869 870 /** 871 * Send a signal to the given process. 872 * 873 * @param pid The pid of the target process. 874 * @param signal The signal to send. 875 */ 876 public static final native void sendSignal(int pid, int signal); 877 878 /** 879 * @hide 880 * Private impl for avoiding a log message... DO NOT USE without doing 881 * your own log, or the Android Illuminati will find you some night and 882 * beat you up. 883 */ 884 public static final void killProcessQuiet(int pid) { 885 sendSignalQuiet(pid, SIGNAL_KILL); 886 } 887 888 /** 889 * @hide 890 * Private impl for avoiding a log message... DO NOT USE without doing 891 * your own log, or the Android Illuminati will find you some night and 892 * beat you up. 893 */ 894 public static final native void sendSignalQuiet(int pid, int signal); 895 896 /** @hide */ 897 public static final native long getFreeMemory(); 898 899 /** @hide */ 900 public static final native long getTotalMemory(); 901 902 /** @hide */ 903 public static final native void readProcLines(String path, 904 String[] reqFields, long[] outSizes); 905 906 /** @hide */ 907 public static final native int[] getPids(String path, int[] lastArray); 908 909 /** @hide */ 910 public static final int PROC_TERM_MASK = 0xff; 911 /** @hide */ 912 public static final int PROC_ZERO_TERM = 0; 913 /** @hide */ 914 public static final int PROC_SPACE_TERM = (int)' '; 915 /** @hide */ 916 public static final int PROC_TAB_TERM = (int)'\t'; 917 /** @hide */ 918 public static final int PROC_COMBINE = 0x100; 919 /** @hide */ 920 public static final int PROC_PARENS = 0x200; 921 /** @hide */ 922 public static final int PROC_OUT_STRING = 0x1000; 923 /** @hide */ 924 public static final int PROC_OUT_LONG = 0x2000; 925 /** @hide */ 926 public static final int PROC_OUT_FLOAT = 0x4000; 927 928 /** @hide */ 929 public static final native boolean readProcFile(String file, int[] format, 930 String[] outStrings, long[] outLongs, float[] outFloats); 931 932 /** @hide */ 933 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 934 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 935 936 /** @hide */ 937 public static final native int[] getPidsForCommands(String[] cmds); 938 939 /** 940 * Gets the total Pss value for a given process, in bytes. 941 * 942 * @param pid the process to the Pss for 943 * @return the total Pss value for the given process in bytes, 944 * or -1 if the value cannot be determined 945 * @hide 946 */ 947 public static final native long getPss(int pid); 948 949 /** 950 * Specifies the outcome of having started a process. 951 * @hide 952 */ 953 public static final class ProcessStartResult { 954 /** 955 * The PID of the newly started process. 956 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 957 */ 958 public int pid; 959 960 /** 961 * True if the process was started with a wrapper attached. 962 */ 963 public boolean usingWrapper; 964 } 965 } 966
