Process.java revision a0c283eac33dd2da72235751bbfa4f2d9898d5ea
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 NFC service process. 102 * @hide 103 */ 104 public static final int NFC_UID = 1027; 105 106 /** 107 * Defines the GID for the group that allows write access to the internal media storage. 108 * @hide 109 */ 110 public static final int MEDIA_RW_GID = 1023; 111 112 /** 113 * Defines the start of a range of UIDs (and GIDs), going from this 114 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 115 * to applications. 116 */ 117 public static final int FIRST_APPLICATION_UID = 10000; 118 /** 119 * Last of application-specific UIDs starting at 120 * {@link #FIRST_APPLICATION_UID}. 121 */ 122 public static final int LAST_APPLICATION_UID = 89999; 123 124 /** 125 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 126 * @hide 127 */ 128 public static final int FIRST_ISOLATED_UID = 99000; 129 130 /** 131 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 132 * @hide 133 */ 134 public static final int LAST_ISOLATED_UID = 99999; 135 136 /** 137 * Defines a secondary group id for access to the bluetooth hardware. 138 */ 139 public static final int BLUETOOTH_GID = 2000; 140 141 /** 142 * Standard priority of application threads. 143 * Use with {@link #setThreadPriority(int)} and 144 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 145 * {@link java.lang.Thread} class. 146 */ 147 public static final int THREAD_PRIORITY_DEFAULT = 0; 148 149 /* 150 * *************************************** 151 * ** Keep in sync with utils/threads.h ** 152 * *************************************** 153 */ 154 155 /** 156 * Lowest available thread priority. Only for those who really, really 157 * don't want to run if anything else is happening. 158 * Use with {@link #setThreadPriority(int)} and 159 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 160 * {@link java.lang.Thread} class. 161 */ 162 public static final int THREAD_PRIORITY_LOWEST = 19; 163 164 /** 165 * Standard priority background threads. This gives your thread a slightly 166 * lower than normal priority, so that it will have less chance of impacting 167 * the responsiveness of the user interface. 168 * Use with {@link #setThreadPriority(int)} and 169 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 170 * {@link java.lang.Thread} class. 171 */ 172 public static final int THREAD_PRIORITY_BACKGROUND = 10; 173 174 /** 175 * Standard priority of threads that are currently running a user interface 176 * that the user is interacting with. Applications can not normally 177 * change to this priority; the system will automatically adjust your 178 * application threads as the user moves through the UI. 179 * Use with {@link #setThreadPriority(int)} and 180 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 181 * {@link java.lang.Thread} class. 182 */ 183 public static final int THREAD_PRIORITY_FOREGROUND = -2; 184 185 /** 186 * Standard priority of system display threads, involved in updating 187 * the user interface. Applications can not 188 * normally change to this priority. 189 * Use with {@link #setThreadPriority(int)} and 190 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 191 * {@link java.lang.Thread} class. 192 */ 193 public static final int THREAD_PRIORITY_DISPLAY = -4; 194 195 /** 196 * Standard priority of the most important display threads, for compositing 197 * the screen and retrieving input events. Applications can not normally 198 * change to this priority. 199 * Use with {@link #setThreadPriority(int)} and 200 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 201 * {@link java.lang.Thread} class. 202 */ 203 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 204 205 /** 206 * Standard priority of audio threads. Applications can not normally 207 * change to this priority. 208 * Use with {@link #setThreadPriority(int)} and 209 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 210 * {@link java.lang.Thread} class. 211 */ 212 public static final int THREAD_PRIORITY_AUDIO = -16; 213 214 /** 215 * Standard priority of the most important audio threads. 216 * Applications can not normally change to this priority. 217 * Use with {@link #setThreadPriority(int)} and 218 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 219 * {@link java.lang.Thread} class. 220 */ 221 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 222 223 /** 224 * Minimum increment to make a priority more favorable. 225 */ 226 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 227 228 /** 229 * Minimum increment to make a priority less favorable. 230 */ 231 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 232 233 /** 234 * Default scheduling policy 235 * @hide 236 */ 237 public static final int SCHED_OTHER = 0; 238 239 /** 240 * First-In First-Out scheduling policy 241 * @hide 242 */ 243 public static final int SCHED_FIFO = 1; 244 245 /** 246 * Round-Robin scheduling policy 247 * @hide 248 */ 249 public static final int SCHED_RR = 2; 250 251 /** 252 * Batch scheduling policy 253 * @hide 254 */ 255 public static final int SCHED_BATCH = 3; 256 257 /** 258 * Idle scheduling policy 259 * @hide 260 */ 261 public static final int SCHED_IDLE = 5; 262 263 /** 264 * Default thread group - gets a 'normal' share of the CPU 265 * @hide 266 */ 267 public static final int THREAD_GROUP_DEFAULT = 0; 268 269 /** 270 * Background non-interactive thread group - All threads in 271 * this group are scheduled with a reduced share of the CPU. 272 * @hide 273 */ 274 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 1; 275 276 /** 277 * Foreground 'boost' thread group - All threads in 278 * this group are scheduled with an increased share of the CPU 279 * @hide 280 **/ 281 public static final int THREAD_GROUP_FG_BOOST = 2; 282 283 public static final int SIGNAL_QUIT = 3; 284 public static final int SIGNAL_KILL = 9; 285 public static final int SIGNAL_USR1 = 10; 286 287 // State for communicating with zygote process 288 289 static LocalSocket sZygoteSocket; 290 static DataInputStream sZygoteInputStream; 291 static BufferedWriter sZygoteWriter; 292 293 /** true if previous zygote open failed */ 294 static boolean sPreviousZygoteOpenFailed; 295 296 /** 297 * Start a new process. 298 * 299 * <p>If processes are enabled, a new process is created and the 300 * static main() function of a <var>processClass</var> is executed there. 301 * The process will continue running after this function returns. 302 * 303 * <p>If processes are not enabled, a new thread in the caller's 304 * process is created and main() of <var>processClass</var> called there. 305 * 306 * <p>The niceName parameter, if not an empty string, is a custom name to 307 * give to the process instead of using processClass. This allows you to 308 * make easily identifyable processes even if you are using the same base 309 * <var>processClass</var> to start them. 310 * 311 * @param processClass The class to use as the process's main entry 312 * point. 313 * @param niceName A more readable name to use for the process. 314 * @param uid The user-id under which the process will run. 315 * @param gid The group-id under which the process will run. 316 * @param gids Additional group-ids associated with the process. 317 * @param debugFlags Additional flags. 318 * @param targetSdkVersion The target SDK version for the app. 319 * @param zygoteArgs Additional arguments to supply to the zygote process. 320 * 321 * @return An object that describes the result of the attempt to start the process. 322 * @throws RuntimeException on fatal start failure 323 * 324 * {@hide} 325 */ 326 public static final ProcessStartResult start(final String processClass, 327 final String niceName, 328 int uid, int gid, int[] gids, 329 int debugFlags, int targetSdkVersion, 330 String[] zygoteArgs) { 331 try { 332 return startViaZygote(processClass, niceName, uid, gid, gids, 333 debugFlags, targetSdkVersion, zygoteArgs); 334 } catch (ZygoteStartFailedEx ex) { 335 Log.e(LOG_TAG, 336 "Starting VM process through Zygote failed"); 337 throw new RuntimeException( 338 "Starting VM process through Zygote failed", ex); 339 } 340 } 341 342 /** retry interval for opening a zygote socket */ 343 static final int ZYGOTE_RETRY_MILLIS = 500; 344 345 /** 346 * Tries to open socket to Zygote process if not already open. If 347 * already open, does nothing. May block and retry. 348 */ 349 private static void openZygoteSocketIfNeeded() 350 throws ZygoteStartFailedEx { 351 352 int retryCount; 353 354 if (sPreviousZygoteOpenFailed) { 355 /* 356 * If we've failed before, expect that we'll fail again and 357 * don't pause for retries. 358 */ 359 retryCount = 0; 360 } else { 361 retryCount = 10; 362 } 363 364 /* 365 * See bug #811181: Sometimes runtime can make it up before zygote. 366 * Really, we'd like to do something better to avoid this condition, 367 * but for now just wait a bit... 368 */ 369 for (int retry = 0 370 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 371 ; retry++ ) { 372 373 if (retry > 0) { 374 try { 375 Log.i("Zygote", "Zygote not up yet, sleeping..."); 376 Thread.sleep(ZYGOTE_RETRY_MILLIS); 377 } catch (InterruptedException ex) { 378 // should never happen 379 } 380 } 381 382 try { 383 sZygoteSocket = new LocalSocket(); 384 385 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 386 LocalSocketAddress.Namespace.RESERVED)); 387 388 sZygoteInputStream 389 = new DataInputStream(sZygoteSocket.getInputStream()); 390 391 sZygoteWriter = 392 new BufferedWriter( 393 new OutputStreamWriter( 394 sZygoteSocket.getOutputStream()), 395 256); 396 397 Log.i("Zygote", "Process: zygote socket opened"); 398 399 sPreviousZygoteOpenFailed = false; 400 break; 401 } catch (IOException ex) { 402 if (sZygoteSocket != null) { 403 try { 404 sZygoteSocket.close(); 405 } catch (IOException ex2) { 406 Log.e(LOG_TAG,"I/O exception on close after exception", 407 ex2); 408 } 409 } 410 411 sZygoteSocket = null; 412 } 413 } 414 415 if (sZygoteSocket == null) { 416 sPreviousZygoteOpenFailed = true; 417 throw new ZygoteStartFailedEx("connect failed"); 418 } 419 } 420 421 /** 422 * Sends an argument list to the zygote process, which starts a new child 423 * and returns the child's pid. Please note: the present implementation 424 * replaces newlines in the argument list with spaces. 425 * @param args argument list 426 * @return An object that describes the result of the attempt to start the process. 427 * @throws ZygoteStartFailedEx if process start failed for any reason 428 */ 429 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 430 throws ZygoteStartFailedEx { 431 openZygoteSocketIfNeeded(); 432 433 try { 434 /** 435 * See com.android.internal.os.ZygoteInit.readArgumentList() 436 * Presently the wire format to the zygote process is: 437 * a) a count of arguments (argc, in essence) 438 * b) a number of newline-separated argument strings equal to count 439 * 440 * After the zygote process reads these it will write the pid of 441 * the child or -1 on failure, followed by boolean to 442 * indicate whether a wrapper process was used. 443 */ 444 445 sZygoteWriter.write(Integer.toString(args.size())); 446 sZygoteWriter.newLine(); 447 448 int sz = args.size(); 449 for (int i = 0; i < sz; i++) { 450 String arg = args.get(i); 451 if (arg.indexOf('\n') >= 0) { 452 throw new ZygoteStartFailedEx( 453 "embedded newlines not allowed"); 454 } 455 sZygoteWriter.write(arg); 456 sZygoteWriter.newLine(); 457 } 458 459 sZygoteWriter.flush(); 460 461 // Should there be a timeout on this? 462 ProcessStartResult result = new ProcessStartResult(); 463 result.pid = sZygoteInputStream.readInt(); 464 if (result.pid < 0) { 465 throw new ZygoteStartFailedEx("fork() failed"); 466 } 467 result.usingWrapper = sZygoteInputStream.readBoolean(); 468 return result; 469 } catch (IOException ex) { 470 try { 471 if (sZygoteSocket != null) { 472 sZygoteSocket.close(); 473 } 474 } catch (IOException ex2) { 475 // we're going to fail anyway 476 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 477 } 478 479 sZygoteSocket = null; 480 481 throw new ZygoteStartFailedEx(ex); 482 } 483 } 484 485 /** 486 * Starts a new process via the zygote mechanism. 487 * 488 * @param processClass Class name whose static main() to run 489 * @param niceName 'nice' process name to appear in ps 490 * @param uid a POSIX uid that the new process should setuid() to 491 * @param gid a POSIX gid that the new process shuold setgid() to 492 * @param gids null-ok; a list of supplementary group IDs that the 493 * new process should setgroup() to. 494 * @param debugFlags Additional flags. 495 * @param targetSdkVersion The target SDK version for the app. 496 * @param extraArgs Additional arguments to supply to the zygote process. 497 * @return An object that describes the result of the attempt to start the process. 498 * @throws ZygoteStartFailedEx if process start failed for any reason 499 */ 500 private static ProcessStartResult startViaZygote(final String processClass, 501 final String niceName, 502 final int uid, final int gid, 503 final int[] gids, 504 int debugFlags, int targetSdkVersion, 505 String[] extraArgs) 506 throws ZygoteStartFailedEx { 507 synchronized(Process.class) { 508 ArrayList<String> argsForZygote = new ArrayList<String>(); 509 510 // --runtime-init, --setuid=, --setgid=, 511 // and --setgroups= must go first 512 argsForZygote.add("--runtime-init"); 513 argsForZygote.add("--setuid=" + uid); 514 argsForZygote.add("--setgid=" + gid); 515 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 516 argsForZygote.add("--enable-jni-logging"); 517 } 518 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 519 argsForZygote.add("--enable-safemode"); 520 } 521 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 522 argsForZygote.add("--enable-debugger"); 523 } 524 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 525 argsForZygote.add("--enable-checkjni"); 526 } 527 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 528 argsForZygote.add("--enable-assert"); 529 } 530 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 531 532 //TODO optionally enable debuger 533 //argsForZygote.add("--enable-debugger"); 534 535 // --setgroups is a comma-separated list 536 if (gids != null && gids.length > 0) { 537 StringBuilder sb = new StringBuilder(); 538 sb.append("--setgroups="); 539 540 int sz = gids.length; 541 for (int i = 0; i < sz; i++) { 542 if (i != 0) { 543 sb.append(','); 544 } 545 sb.append(gids[i]); 546 } 547 548 argsForZygote.add(sb.toString()); 549 } 550 551 if (niceName != null) { 552 argsForZygote.add("--nice-name=" + niceName); 553 } 554 555 argsForZygote.add(processClass); 556 557 if (extraArgs != null) { 558 for (String arg : extraArgs) { 559 argsForZygote.add(arg); 560 } 561 } 562 563 return zygoteSendArgsAndGetResult(argsForZygote); 564 } 565 } 566 567 /** 568 * Returns elapsed milliseconds of the time this process has run. 569 * @return Returns the number of milliseconds this process has return. 570 */ 571 public static final native long getElapsedCpuTime(); 572 573 /** 574 * Returns the identifier of this process, which can be used with 575 * {@link #killProcess} and {@link #sendSignal}. 576 */ 577 public static final native int myPid(); 578 579 /** 580 * Returns the identifier of the calling thread, which be used with 581 * {@link #setThreadPriority(int, int)}. 582 */ 583 public static final native int myTid(); 584 585 /** 586 * Returns the identifier of this process's user. 587 */ 588 public static final native int myUid(); 589 590 /** 591 * Returns whether the current process is in an isolated sandbox. 592 * @hide 593 */ 594 public static final boolean isIsolated() { 595 int uid = UserId.getAppId(myUid()); 596 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 597 } 598 599 /** 600 * Returns the UID assigned to a particular user name, or -1 if there is 601 * none. If the given string consists of only numbers, it is converted 602 * directly to a uid. 603 */ 604 public static final native int getUidForName(String name); 605 606 /** 607 * Returns the GID assigned to a particular user name, or -1 if there is 608 * none. If the given string consists of only numbers, it is converted 609 * directly to a gid. 610 */ 611 public static final native int getGidForName(String name); 612 613 /** 614 * Returns a uid for a currently running process. 615 * @param pid the process id 616 * @return the uid of the process, or -1 if the process is not running. 617 * @hide pending API council review 618 */ 619 public static final int getUidForPid(int pid) { 620 String[] procStatusLabels = { "Uid:" }; 621 long[] procStatusValues = new long[1]; 622 procStatusValues[0] = -1; 623 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 624 return (int) procStatusValues[0]; 625 } 626 627 /** 628 * Returns the parent process id for a currently running process. 629 * @param pid the process id 630 * @return the parent process id of the process, or -1 if the process is not running. 631 * @hide 632 */ 633 public static final int getParentPid(int pid) { 634 String[] procStatusLabels = { "PPid:" }; 635 long[] procStatusValues = new long[1]; 636 procStatusValues[0] = -1; 637 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 638 return (int) procStatusValues[0]; 639 } 640 641 /** 642 * Set the priority of a thread, based on Linux priorities. 643 * 644 * @param tid The identifier of the thread/process to change. 645 * @param priority A Linux priority level, from -20 for highest scheduling 646 * priority to 19 for lowest scheduling priority. 647 * 648 * @throws IllegalArgumentException Throws IllegalArgumentException if 649 * <var>tid</var> does not exist. 650 * @throws SecurityException Throws SecurityException if your process does 651 * not have permission to modify the given thread, or to use the given 652 * priority. 653 */ 654 public static final native void setThreadPriority(int tid, int priority) 655 throws IllegalArgumentException, SecurityException; 656 657 /** 658 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 659 * throw an exception if passed a background-level thread priority. This is only 660 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 661 * 662 * @hide 663 */ 664 public static final native void setCanSelfBackground(boolean backgroundOk); 665 666 /** 667 * Sets the scheduling group for a thread. 668 * @hide 669 * @param tid The indentifier of the thread/process to change. 670 * @param group The target group for this thread/process. 671 * 672 * @throws IllegalArgumentException Throws IllegalArgumentException if 673 * <var>tid</var> does not exist. 674 * @throws SecurityException Throws SecurityException if your process does 675 * not have permission to modify the given thread, or to use the given 676 * priority. 677 */ 678 public static final native void setThreadGroup(int tid, int group) 679 throws IllegalArgumentException, SecurityException; 680 /** 681 * Sets the scheduling group for a process and all child threads 682 * @hide 683 * @param pid The indentifier of the process to change. 684 * @param group The target group for this process. 685 * 686 * @throws IllegalArgumentException Throws IllegalArgumentException if 687 * <var>tid</var> does not exist. 688 * @throws SecurityException Throws SecurityException if your process does 689 * not have permission to modify the given thread, or to use the given 690 * priority. 691 */ 692 public static final native void setProcessGroup(int pid, int group) 693 throws IllegalArgumentException, SecurityException; 694 695 /** 696 * Set the priority of the calling thread, based on Linux priorities. See 697 * {@link #setThreadPriority(int, int)} for more information. 698 * 699 * @param priority A Linux priority level, from -20 for highest scheduling 700 * priority to 19 for lowest scheduling priority. 701 * 702 * @throws IllegalArgumentException Throws IllegalArgumentException if 703 * <var>tid</var> does not exist. 704 * @throws SecurityException Throws SecurityException if your process does 705 * not have permission to modify the given thread, or to use the given 706 * priority. 707 * 708 * @see #setThreadPriority(int, int) 709 */ 710 public static final native void setThreadPriority(int priority) 711 throws IllegalArgumentException, SecurityException; 712 713 /** 714 * Return the current priority of a thread, based on Linux priorities. 715 * 716 * @param tid The identifier of the thread/process to change. 717 * 718 * @return Returns the current priority, as a Linux priority level, 719 * from -20 for highest scheduling priority to 19 for lowest scheduling 720 * priority. 721 * 722 * @throws IllegalArgumentException Throws IllegalArgumentException if 723 * <var>tid</var> does not exist. 724 */ 725 public static final native int getThreadPriority(int tid) 726 throws IllegalArgumentException; 727 728 /** 729 * Set the scheduling policy and priority of a thread, based on Linux. 730 * 731 * @param tid The identifier of the thread/process to change. 732 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 733 * @param priority A Linux priority level in a range appropriate for the given policy. 734 * 735 * @throws IllegalArgumentException Throws IllegalArgumentException if 736 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 737 * @throws SecurityException Throws SecurityException if your process does 738 * not have permission to modify the given thread, or to use the given 739 * scheduling policy or priority. 740 * 741 * {@hide} 742 */ 743 public static final native void setThreadScheduler(int tid, int policy, int priority) 744 throws IllegalArgumentException; 745 746 /** 747 * Determine whether the current environment supports multiple processes. 748 * 749 * @return Returns true if the system can run in multiple processes, else 750 * false if everything is running in a single process. 751 * 752 * @deprecated This method always returns true. Do not use. 753 */ 754 @Deprecated 755 public static final boolean supportsProcesses() { 756 return true; 757 } 758 759 /** 760 * Set the out-of-memory badness adjustment for a process. 761 * 762 * @param pid The process identifier to set. 763 * @param amt Adjustment value -- linux allows -16 to +15. 764 * 765 * @return Returns true if the underlying system supports this 766 * feature, else false. 767 * 768 * {@hide} 769 */ 770 public static final native boolean setOomAdj(int pid, int amt); 771 772 /** 773 * Change this process's argv[0] parameter. This can be useful to show 774 * more descriptive information in things like the 'ps' command. 775 * 776 * @param text The new name of this process. 777 * 778 * {@hide} 779 */ 780 public static final native void setArgV0(String text); 781 782 /** 783 * Kill the process with the given PID. 784 * Note that, though this API allows us to request to 785 * kill any process based on its PID, the kernel will 786 * still impose standard restrictions on which PIDs you 787 * are actually able to kill. Typically this means only 788 * the process running the caller's packages/application 789 * and any additional processes created by that app; packages 790 * sharing a common UID will also be able to kill each 791 * other's processes. 792 */ 793 public static final void killProcess(int pid) { 794 sendSignal(pid, SIGNAL_KILL); 795 } 796 797 /** @hide */ 798 public static final native int setUid(int uid); 799 800 /** @hide */ 801 public static final native int setGid(int uid); 802 803 /** 804 * Send a signal to the given process. 805 * 806 * @param pid The pid of the target process. 807 * @param signal The signal to send. 808 */ 809 public static final native void sendSignal(int pid, int signal); 810 811 /** 812 * @hide 813 * Private impl for avoiding a log message... DO NOT USE without doing 814 * your own log, or the Android Illuminati will find you some night and 815 * beat you up. 816 */ 817 public static final void killProcessQuiet(int pid) { 818 sendSignalQuiet(pid, SIGNAL_KILL); 819 } 820 821 /** 822 * @hide 823 * Private impl for avoiding a log message... DO NOT USE without doing 824 * your own log, or the Android Illuminati will find you some night and 825 * beat you up. 826 */ 827 public static final native void sendSignalQuiet(int pid, int signal); 828 829 /** @hide */ 830 public static final native long getFreeMemory(); 831 832 /** @hide */ 833 public static final native void readProcLines(String path, 834 String[] reqFields, long[] outSizes); 835 836 /** @hide */ 837 public static final native int[] getPids(String path, int[] lastArray); 838 839 /** @hide */ 840 public static final int PROC_TERM_MASK = 0xff; 841 /** @hide */ 842 public static final int PROC_ZERO_TERM = 0; 843 /** @hide */ 844 public static final int PROC_SPACE_TERM = (int)' '; 845 /** @hide */ 846 public static final int PROC_TAB_TERM = (int)'\t'; 847 /** @hide */ 848 public static final int PROC_COMBINE = 0x100; 849 /** @hide */ 850 public static final int PROC_PARENS = 0x200; 851 /** @hide */ 852 public static final int PROC_OUT_STRING = 0x1000; 853 /** @hide */ 854 public static final int PROC_OUT_LONG = 0x2000; 855 /** @hide */ 856 public static final int PROC_OUT_FLOAT = 0x4000; 857 858 /** @hide */ 859 public static final native boolean readProcFile(String file, int[] format, 860 String[] outStrings, long[] outLongs, float[] outFloats); 861 862 /** @hide */ 863 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 864 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 865 866 /** 867 * Gets the total Pss value for a given process, in bytes. 868 * 869 * @param pid the process to the Pss for 870 * @return the total Pss value for the given process in bytes, 871 * or -1 if the value cannot be determined 872 * @hide 873 */ 874 public static final native long getPss(int pid); 875 876 /** 877 * Specifies the outcome of having started a process. 878 * @hide 879 */ 880 public static final class ProcessStartResult { 881 /** 882 * The PID of the newly started process. 883 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 884 */ 885 public int pid; 886 887 /** 888 * True if the process was started with a wrapper attached. 889 */ 890 public boolean usingWrapper; 891 } 892} 893