Process.java revision 26993b37d525fd64efebd51daec1b4abfebd8a74
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 GID for the group that allows write access to the SD card. 96 * @hide 97 */ 98 public static final int SDCARD_RW_GID = 1015; 99 100 /** 101 * Defines the UID/GID for the group that controls VPN services. 102 * @hide 103 */ 104 public static final int VPN_UID = 1016; 105 106 /** 107 * Defines the UID/GID for the NFC service process. 108 * @hide 109 */ 110 public static final int NFC_UID = 1027; 111 112 /** 113 * Defines the GID for the group that allows write access to the internal media storage. 114 * @hide 115 */ 116 public static final int MEDIA_RW_GID = 1023; 117 118 /** 119 * Defines the start of a range of UIDs (and GIDs), going from this 120 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 121 * to applications. 122 */ 123 public static final int FIRST_APPLICATION_UID = 10000; 124 /** 125 * Last of application-specific UIDs starting at 126 * {@link #FIRST_APPLICATION_UID}. 127 */ 128 public static final int LAST_APPLICATION_UID = 19999; 129 130 /** 131 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 132 * @hide 133 */ 134 public static final int FIRST_ISOLATED_UID = 99000; 135 136 /** 137 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 138 * @hide 139 */ 140 public static final int LAST_ISOLATED_UID = 99999; 141 142 /** 143 * Defines a secondary group id for access to the bluetooth hardware. 144 */ 145 public static final int BLUETOOTH_GID = 2000; 146 147 /** 148 * Standard priority of application threads. 149 * Use with {@link #setThreadPriority(int)} and 150 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 151 * {@link java.lang.Thread} class. 152 */ 153 public static final int THREAD_PRIORITY_DEFAULT = 0; 154 155 /* 156 * *************************************** 157 * ** Keep in sync with utils/threads.h ** 158 * *************************************** 159 */ 160 161 /** 162 * Lowest available thread priority. Only for those who really, really 163 * don't want to run if anything else is happening. 164 * Use with {@link #setThreadPriority(int)} and 165 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 166 * {@link java.lang.Thread} class. 167 */ 168 public static final int THREAD_PRIORITY_LOWEST = 19; 169 170 /** 171 * Standard priority background threads. This gives your thread a slightly 172 * lower than normal priority, so that it will have less chance of impacting 173 * the responsiveness of the user interface. 174 * Use with {@link #setThreadPriority(int)} and 175 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 176 * {@link java.lang.Thread} class. 177 */ 178 public static final int THREAD_PRIORITY_BACKGROUND = 10; 179 180 /** 181 * Standard priority of threads that are currently running a user interface 182 * that the user is interacting with. Applications can not normally 183 * change to this priority; the system will automatically adjust your 184 * application threads as the user moves through the UI. 185 * Use with {@link #setThreadPriority(int)} and 186 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 187 * {@link java.lang.Thread} class. 188 */ 189 public static final int THREAD_PRIORITY_FOREGROUND = -2; 190 191 /** 192 * Standard priority of system display threads, involved in updating 193 * the user interface. Applications can not 194 * normally change to this priority. 195 * Use with {@link #setThreadPriority(int)} and 196 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 197 * {@link java.lang.Thread} class. 198 */ 199 public static final int THREAD_PRIORITY_DISPLAY = -4; 200 201 /** 202 * Standard priority of the most important display threads, for compositing 203 * the screen and retrieving input events. Applications can not normally 204 * change to this priority. 205 * Use with {@link #setThreadPriority(int)} and 206 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 207 * {@link java.lang.Thread} class. 208 */ 209 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 210 211 /** 212 * Standard priority of audio threads. Applications can not normally 213 * change to this priority. 214 * Use with {@link #setThreadPriority(int)} and 215 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 216 * {@link java.lang.Thread} class. 217 */ 218 public static final int THREAD_PRIORITY_AUDIO = -16; 219 220 /** 221 * Standard priority of the most important audio threads. 222 * Applications can not normally change to this priority. 223 * Use with {@link #setThreadPriority(int)} and 224 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 225 * {@link java.lang.Thread} class. 226 */ 227 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 228 229 /** 230 * Minimum increment to make a priority more favorable. 231 */ 232 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 233 234 /** 235 * Minimum increment to make a priority less favorable. 236 */ 237 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 238 239 /** 240 * Default scheduling policy 241 * @hide 242 */ 243 public static final int SCHED_OTHER = 0; 244 245 /** 246 * First-In First-Out scheduling policy 247 * @hide 248 */ 249 public static final int SCHED_FIFO = 1; 250 251 /** 252 * Round-Robin scheduling policy 253 * @hide 254 */ 255 public static final int SCHED_RR = 2; 256 257 /** 258 * Batch scheduling policy 259 * @hide 260 */ 261 public static final int SCHED_BATCH = 3; 262 263 /** 264 * Idle scheduling policy 265 * @hide 266 */ 267 public static final int SCHED_IDLE = 5; 268 269 /** 270 * Default thread group - gets a 'normal' share of the CPU 271 * @hide 272 */ 273 public static final int THREAD_GROUP_DEFAULT = 0; 274 275 /** 276 * Background non-interactive thread group - All threads in 277 * this group are scheduled with a reduced share of the CPU. 278 * @hide 279 */ 280 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 1; 281 282 /** 283 * Foreground 'boost' thread group - All threads in 284 * this group are scheduled with an increased share of the CPU 285 * @hide 286 **/ 287 public static final int THREAD_GROUP_FG_BOOST = 2; 288 289 public static final int SIGNAL_QUIT = 3; 290 public static final int SIGNAL_KILL = 9; 291 public static final int SIGNAL_USR1 = 10; 292 293 // State for communicating with zygote process 294 295 static LocalSocket sZygoteSocket; 296 static DataInputStream sZygoteInputStream; 297 static BufferedWriter sZygoteWriter; 298 299 /** true if previous zygote open failed */ 300 static boolean sPreviousZygoteOpenFailed; 301 302 /** 303 * Start a new process. 304 * 305 * <p>If processes are enabled, a new process is created and the 306 * static main() function of a <var>processClass</var> is executed there. 307 * The process will continue running after this function returns. 308 * 309 * <p>If processes are not enabled, a new thread in the caller's 310 * process is created and main() of <var>processClass</var> called there. 311 * 312 * <p>The niceName parameter, if not an empty string, is a custom name to 313 * give to the process instead of using processClass. This allows you to 314 * make easily identifyable processes even if you are using the same base 315 * <var>processClass</var> to start them. 316 * 317 * @param processClass The class to use as the process's main entry 318 * point. 319 * @param niceName A more readable name to use for the process. 320 * @param uid The user-id under which the process will run. 321 * @param gid The group-id under which the process will run. 322 * @param gids Additional group-ids associated with the process. 323 * @param debugFlags Additional flags. 324 * @param targetSdkVersion The target SDK version for the app. 325 * @param zygoteArgs Additional arguments to supply to the zygote process. 326 * 327 * @return An object that describes the result of the attempt to start the process. 328 * @throws RuntimeException on fatal start failure 329 * 330 * {@hide} 331 */ 332 public static final ProcessStartResult start(final String processClass, 333 final String niceName, 334 int uid, int gid, int[] gids, 335 int debugFlags, int targetSdkVersion, 336 String[] zygoteArgs) { 337 try { 338 return startViaZygote(processClass, niceName, uid, gid, gids, 339 debugFlags, targetSdkVersion, zygoteArgs); 340 } catch (ZygoteStartFailedEx ex) { 341 Log.e(LOG_TAG, 342 "Starting VM process through Zygote failed"); 343 throw new RuntimeException( 344 "Starting VM process through Zygote failed", ex); 345 } 346 } 347 348 /** retry interval for opening a zygote socket */ 349 static final int ZYGOTE_RETRY_MILLIS = 500; 350 351 /** 352 * Tries to open socket to Zygote process if not already open. If 353 * already open, does nothing. May block and retry. 354 */ 355 private static void openZygoteSocketIfNeeded() 356 throws ZygoteStartFailedEx { 357 358 int retryCount; 359 360 if (sPreviousZygoteOpenFailed) { 361 /* 362 * If we've failed before, expect that we'll fail again and 363 * don't pause for retries. 364 */ 365 retryCount = 0; 366 } else { 367 retryCount = 10; 368 } 369 370 /* 371 * See bug #811181: Sometimes runtime can make it up before zygote. 372 * Really, we'd like to do something better to avoid this condition, 373 * but for now just wait a bit... 374 */ 375 for (int retry = 0 376 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 377 ; retry++ ) { 378 379 if (retry > 0) { 380 try { 381 Log.i("Zygote", "Zygote not up yet, sleeping..."); 382 Thread.sleep(ZYGOTE_RETRY_MILLIS); 383 } catch (InterruptedException ex) { 384 // should never happen 385 } 386 } 387 388 try { 389 sZygoteSocket = new LocalSocket(); 390 391 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 392 LocalSocketAddress.Namespace.RESERVED)); 393 394 sZygoteInputStream 395 = new DataInputStream(sZygoteSocket.getInputStream()); 396 397 sZygoteWriter = 398 new BufferedWriter( 399 new OutputStreamWriter( 400 sZygoteSocket.getOutputStream()), 401 256); 402 403 Log.i("Zygote", "Process: zygote socket opened"); 404 405 sPreviousZygoteOpenFailed = false; 406 break; 407 } catch (IOException ex) { 408 if (sZygoteSocket != null) { 409 try { 410 sZygoteSocket.close(); 411 } catch (IOException ex2) { 412 Log.e(LOG_TAG,"I/O exception on close after exception", 413 ex2); 414 } 415 } 416 417 sZygoteSocket = null; 418 } 419 } 420 421 if (sZygoteSocket == null) { 422 sPreviousZygoteOpenFailed = true; 423 throw new ZygoteStartFailedEx("connect failed"); 424 } 425 } 426 427 /** 428 * Sends an argument list to the zygote process, which starts a new child 429 * and returns the child's pid. Please note: the present implementation 430 * replaces newlines in the argument list with spaces. 431 * @param args argument list 432 * @return An object that describes the result of the attempt to start the process. 433 * @throws ZygoteStartFailedEx if process start failed for any reason 434 */ 435 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 436 throws ZygoteStartFailedEx { 437 openZygoteSocketIfNeeded(); 438 439 try { 440 /** 441 * See com.android.internal.os.ZygoteInit.readArgumentList() 442 * Presently the wire format to the zygote process is: 443 * a) a count of arguments (argc, in essence) 444 * b) a number of newline-separated argument strings equal to count 445 * 446 * After the zygote process reads these it will write the pid of 447 * the child or -1 on failure, followed by boolean to 448 * indicate whether a wrapper process was used. 449 */ 450 451 sZygoteWriter.write(Integer.toString(args.size())); 452 sZygoteWriter.newLine(); 453 454 int sz = args.size(); 455 for (int i = 0; i < sz; i++) { 456 String arg = args.get(i); 457 if (arg.indexOf('\n') >= 0) { 458 throw new ZygoteStartFailedEx( 459 "embedded newlines not allowed"); 460 } 461 sZygoteWriter.write(arg); 462 sZygoteWriter.newLine(); 463 } 464 465 sZygoteWriter.flush(); 466 467 // Should there be a timeout on this? 468 ProcessStartResult result = new ProcessStartResult(); 469 result.pid = sZygoteInputStream.readInt(); 470 if (result.pid < 0) { 471 throw new ZygoteStartFailedEx("fork() failed"); 472 } 473 result.usingWrapper = sZygoteInputStream.readBoolean(); 474 return result; 475 } catch (IOException ex) { 476 try { 477 if (sZygoteSocket != null) { 478 sZygoteSocket.close(); 479 } 480 } catch (IOException ex2) { 481 // we're going to fail anyway 482 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 483 } 484 485 sZygoteSocket = null; 486 487 throw new ZygoteStartFailedEx(ex); 488 } 489 } 490 491 /** 492 * Starts a new process via the zygote mechanism. 493 * 494 * @param processClass Class name whose static main() to run 495 * @param niceName 'nice' process name to appear in ps 496 * @param uid a POSIX uid that the new process should setuid() to 497 * @param gid a POSIX gid that the new process shuold setgid() to 498 * @param gids null-ok; a list of supplementary group IDs that the 499 * new process should setgroup() to. 500 * @param debugFlags Additional flags. 501 * @param targetSdkVersion The target SDK version for the app. 502 * @param extraArgs Additional arguments to supply to the zygote process. 503 * @return An object that describes the result of the attempt to start the process. 504 * @throws ZygoteStartFailedEx if process start failed for any reason 505 */ 506 private static ProcessStartResult startViaZygote(final String processClass, 507 final String niceName, 508 final int uid, final int gid, 509 final int[] gids, 510 int debugFlags, int targetSdkVersion, 511 String[] extraArgs) 512 throws ZygoteStartFailedEx { 513 synchronized(Process.class) { 514 ArrayList<String> argsForZygote = new ArrayList<String>(); 515 516 // --runtime-init, --setuid=, --setgid=, 517 // and --setgroups= must go first 518 argsForZygote.add("--runtime-init"); 519 argsForZygote.add("--setuid=" + uid); 520 argsForZygote.add("--setgid=" + gid); 521 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 522 argsForZygote.add("--enable-jni-logging"); 523 } 524 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 525 argsForZygote.add("--enable-safemode"); 526 } 527 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 528 argsForZygote.add("--enable-debugger"); 529 } 530 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 531 argsForZygote.add("--enable-checkjni"); 532 } 533 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 534 argsForZygote.add("--enable-assert"); 535 } 536 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 537 538 //TODO optionally enable debuger 539 //argsForZygote.add("--enable-debugger"); 540 541 // --setgroups is a comma-separated list 542 if (gids != null && gids.length > 0) { 543 StringBuilder sb = new StringBuilder(); 544 sb.append("--setgroups="); 545 546 int sz = gids.length; 547 for (int i = 0; i < sz; i++) { 548 if (i != 0) { 549 sb.append(','); 550 } 551 sb.append(gids[i]); 552 } 553 554 argsForZygote.add(sb.toString()); 555 } 556 557 if (niceName != null) { 558 argsForZygote.add("--nice-name=" + niceName); 559 } 560 561 argsForZygote.add(processClass); 562 563 if (extraArgs != null) { 564 for (String arg : extraArgs) { 565 argsForZygote.add(arg); 566 } 567 } 568 569 return zygoteSendArgsAndGetResult(argsForZygote); 570 } 571 } 572 573 /** 574 * Returns elapsed milliseconds of the time this process has run. 575 * @return Returns the number of milliseconds this process has return. 576 */ 577 public static final native long getElapsedCpuTime(); 578 579 /** 580 * Returns the identifier of this process, which can be used with 581 * {@link #killProcess} and {@link #sendSignal}. 582 */ 583 public static final native int myPid(); 584 585 /** 586 * Returns the identifier of the calling thread, which be used with 587 * {@link #setThreadPriority(int, int)}. 588 */ 589 public static final native int myTid(); 590 591 /** 592 * Returns the identifier of this process's user. 593 */ 594 public static final native int myUid(); 595 596 /** 597 * Returns whether the current process is in an isolated sandbox. 598 * @hide 599 */ 600 public static final boolean isIsolated() { 601 int uid = UserId.getAppId(myUid()); 602 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 603 } 604 605 /** 606 * Returns the UID assigned to a particular user name, or -1 if there is 607 * none. If the given string consists of only numbers, it is converted 608 * directly to a uid. 609 */ 610 public static final native int getUidForName(String name); 611 612 /** 613 * Returns the GID assigned to a particular user name, or -1 if there is 614 * none. If the given string consists of only numbers, it is converted 615 * directly to a gid. 616 */ 617 public static final native int getGidForName(String name); 618 619 /** 620 * Returns a uid for a currently running process. 621 * @param pid the process id 622 * @return the uid of the process, or -1 if the process is not running. 623 * @hide pending API council review 624 */ 625 public static final int getUidForPid(int pid) { 626 String[] procStatusLabels = { "Uid:" }; 627 long[] procStatusValues = new long[1]; 628 procStatusValues[0] = -1; 629 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 630 return (int) procStatusValues[0]; 631 } 632 633 /** 634 * Returns the parent process id for a currently running process. 635 * @param pid the process id 636 * @return the parent process id of the process, or -1 if the process is not running. 637 * @hide 638 */ 639 public static final int getParentPid(int pid) { 640 String[] procStatusLabels = { "PPid:" }; 641 long[] procStatusValues = new long[1]; 642 procStatusValues[0] = -1; 643 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 644 return (int) procStatusValues[0]; 645 } 646 647 /** 648 * Set the priority of a thread, based on Linux priorities. 649 * 650 * @param tid The identifier of the thread/process to change. 651 * @param priority A Linux priority level, from -20 for highest scheduling 652 * priority to 19 for lowest scheduling priority. 653 * 654 * @throws IllegalArgumentException Throws IllegalArgumentException if 655 * <var>tid</var> does not exist. 656 * @throws SecurityException Throws SecurityException if your process does 657 * not have permission to modify the given thread, or to use the given 658 * priority. 659 */ 660 public static final native void setThreadPriority(int tid, int priority) 661 throws IllegalArgumentException, SecurityException; 662 663 /** 664 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 665 * throw an exception if passed a background-level thread priority. This is only 666 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 667 * 668 * @hide 669 */ 670 public static final native void setCanSelfBackground(boolean backgroundOk); 671 672 /** 673 * Sets the scheduling group for a thread. 674 * @hide 675 * @param tid The indentifier of the thread/process to change. 676 * @param group The target group for this thread/process. 677 * 678 * @throws IllegalArgumentException Throws IllegalArgumentException if 679 * <var>tid</var> does not exist. 680 * @throws SecurityException Throws SecurityException if your process does 681 * not have permission to modify the given thread, or to use the given 682 * priority. 683 */ 684 public static final native void setThreadGroup(int tid, int group) 685 throws IllegalArgumentException, SecurityException; 686 /** 687 * Sets the scheduling group for a process and all child threads 688 * @hide 689 * @param pid The indentifier of the process to change. 690 * @param group The target group for this process. 691 * 692 * @throws IllegalArgumentException Throws IllegalArgumentException if 693 * <var>tid</var> does not exist. 694 * @throws SecurityException Throws SecurityException if your process does 695 * not have permission to modify the given thread, or to use the given 696 * priority. 697 */ 698 public static final native void setProcessGroup(int pid, int group) 699 throws IllegalArgumentException, SecurityException; 700 701 /** 702 * Set the priority of the calling thread, based on Linux priorities. See 703 * {@link #setThreadPriority(int, int)} for more information. 704 * 705 * @param priority A Linux priority level, from -20 for highest scheduling 706 * priority to 19 for lowest scheduling priority. 707 * 708 * @throws IllegalArgumentException Throws IllegalArgumentException if 709 * <var>tid</var> does not exist. 710 * @throws SecurityException Throws SecurityException if your process does 711 * not have permission to modify the given thread, or to use the given 712 * priority. 713 * 714 * @see #setThreadPriority(int, int) 715 */ 716 public static final native void setThreadPriority(int priority) 717 throws IllegalArgumentException, SecurityException; 718 719 /** 720 * Return the current priority of a thread, based on Linux priorities. 721 * 722 * @param tid The identifier of the thread/process to change. 723 * 724 * @return Returns the current priority, as a Linux priority level, 725 * from -20 for highest scheduling priority to 19 for lowest scheduling 726 * priority. 727 * 728 * @throws IllegalArgumentException Throws IllegalArgumentException if 729 * <var>tid</var> does not exist. 730 */ 731 public static final native int getThreadPriority(int tid) 732 throws IllegalArgumentException; 733 734 /** 735 * Set the scheduling policy and priority of a thread, based on Linux. 736 * 737 * @param tid The identifier of the thread/process to change. 738 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 739 * @param priority A Linux priority level in a range appropriate for the given policy. 740 * 741 * @throws IllegalArgumentException Throws IllegalArgumentException if 742 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 743 * @throws SecurityException Throws SecurityException if your process does 744 * not have permission to modify the given thread, or to use the given 745 * scheduling policy or priority. 746 * 747 * {@hide} 748 */ 749 public static final native void setThreadScheduler(int tid, int policy, int priority) 750 throws IllegalArgumentException; 751 752 /** 753 * Determine whether the current environment supports multiple processes. 754 * 755 * @return Returns true if the system can run in multiple processes, else 756 * false if everything is running in a single process. 757 * 758 * @deprecated This method always returns true. Do not use. 759 */ 760 @Deprecated 761 public static final boolean supportsProcesses() { 762 return true; 763 } 764 765 /** 766 * Set the out-of-memory badness adjustment for a process. 767 * 768 * @param pid The process identifier to set. 769 * @param amt Adjustment value -- linux allows -16 to +15. 770 * 771 * @return Returns true if the underlying system supports this 772 * feature, else false. 773 * 774 * {@hide} 775 */ 776 public static final native boolean setOomAdj(int pid, int amt); 777 778 /** 779 * Change this process's argv[0] parameter. This can be useful to show 780 * more descriptive information in things like the 'ps' command. 781 * 782 * @param text The new name of this process. 783 * 784 * {@hide} 785 */ 786 public static final native void setArgV0(String text); 787 788 /** 789 * Kill the process with the given PID. 790 * Note that, though this API allows us to request to 791 * kill any process based on its PID, the kernel will 792 * still impose standard restrictions on which PIDs you 793 * are actually able to kill. Typically this means only 794 * the process running the caller's packages/application 795 * and any additional processes created by that app; packages 796 * sharing a common UID will also be able to kill each 797 * other's processes. 798 */ 799 public static final void killProcess(int pid) { 800 sendSignal(pid, SIGNAL_KILL); 801 } 802 803 /** @hide */ 804 public static final native int setUid(int uid); 805 806 /** @hide */ 807 public static final native int setGid(int uid); 808 809 /** 810 * Send a signal to the given process. 811 * 812 * @param pid The pid of the target process. 813 * @param signal The signal to send. 814 */ 815 public static final native void sendSignal(int pid, int signal); 816 817 /** 818 * @hide 819 * Private impl for avoiding a log message... DO NOT USE without doing 820 * your own log, or the Android Illuminati will find you some night and 821 * beat you up. 822 */ 823 public static final void killProcessQuiet(int pid) { 824 sendSignalQuiet(pid, SIGNAL_KILL); 825 } 826 827 /** 828 * @hide 829 * Private impl for avoiding a log message... DO NOT USE without doing 830 * your own log, or the Android Illuminati will find you some night and 831 * beat you up. 832 */ 833 public static final native void sendSignalQuiet(int pid, int signal); 834 835 /** @hide */ 836 public static final native long getFreeMemory(); 837 838 /** @hide */ 839 public static final native void readProcLines(String path, 840 String[] reqFields, long[] outSizes); 841 842 /** @hide */ 843 public static final native int[] getPids(String path, int[] lastArray); 844 845 /** @hide */ 846 public static final int PROC_TERM_MASK = 0xff; 847 /** @hide */ 848 public static final int PROC_ZERO_TERM = 0; 849 /** @hide */ 850 public static final int PROC_SPACE_TERM = (int)' '; 851 /** @hide */ 852 public static final int PROC_TAB_TERM = (int)'\t'; 853 /** @hide */ 854 public static final int PROC_COMBINE = 0x100; 855 /** @hide */ 856 public static final int PROC_PARENS = 0x200; 857 /** @hide */ 858 public static final int PROC_OUT_STRING = 0x1000; 859 /** @hide */ 860 public static final int PROC_OUT_LONG = 0x2000; 861 /** @hide */ 862 public static final int PROC_OUT_FLOAT = 0x4000; 863 864 /** @hide */ 865 public static final native boolean readProcFile(String file, int[] format, 866 String[] outStrings, long[] outLongs, float[] outFloats); 867 868 /** @hide */ 869 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 870 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 871 872 /** 873 * Gets the total Pss value for a given process, in bytes. 874 * 875 * @param pid the process to the Pss for 876 * @return the total Pss value for the given process in bytes, 877 * or -1 if the value cannot be determined 878 * @hide 879 */ 880 public static final native long getPss(int pid); 881 882 /** 883 * Specifies the outcome of having started a process. 884 * @hide 885 */ 886 public static final class ProcessStartResult { 887 /** 888 * The PID of the newly started process. 889 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 890 */ 891 public int pid; 892 893 /** 894 * True if the process was started with a wrapper attached. 895 */ 896 public boolean usingWrapper; 897 } 898} 899