Process.java revision 8b7d1b4d4a33e9429c5cedaa6317efcaad95da68
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 = 1025; 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 = 99999; 123 124 /** 125 * Defines a secondary group id for access to the bluetooth hardware. 126 */ 127 public static final int BLUETOOTH_GID = 2000; 128 129 /** 130 * Standard priority of application threads. 131 * Use with {@link #setThreadPriority(int)} and 132 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 133 * {@link java.lang.Thread} class. 134 */ 135 public static final int THREAD_PRIORITY_DEFAULT = 0; 136 137 /* 138 * *************************************** 139 * ** Keep in sync with utils/threads.h ** 140 * *************************************** 141 */ 142 143 /** 144 * Lowest available thread priority. Only for those who really, really 145 * don't want to run if anything else is happening. 146 * Use with {@link #setThreadPriority(int)} and 147 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 148 * {@link java.lang.Thread} class. 149 */ 150 public static final int THREAD_PRIORITY_LOWEST = 19; 151 152 /** 153 * Standard priority background threads. This gives your thread a slightly 154 * lower than normal priority, so that it will have less chance of impacting 155 * the responsiveness of the user interface. 156 * Use with {@link #setThreadPriority(int)} and 157 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 158 * {@link java.lang.Thread} class. 159 */ 160 public static final int THREAD_PRIORITY_BACKGROUND = 10; 161 162 /** 163 * Standard priority of threads that are currently running a user interface 164 * that the user is interacting with. Applications can not normally 165 * change to this priority; the system will automatically adjust your 166 * application threads as the user moves through the UI. 167 * Use with {@link #setThreadPriority(int)} and 168 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 169 * {@link java.lang.Thread} class. 170 */ 171 public static final int THREAD_PRIORITY_FOREGROUND = -2; 172 173 /** 174 * Standard priority of system display threads, involved in updating 175 * the user interface. Applications can not 176 * normally change to this priority. 177 * Use with {@link #setThreadPriority(int)} and 178 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 179 * {@link java.lang.Thread} class. 180 */ 181 public static final int THREAD_PRIORITY_DISPLAY = -4; 182 183 /** 184 * Standard priority of the most important display threads, for compositing 185 * the screen and retrieving input events. Applications can not normally 186 * change to this priority. 187 * Use with {@link #setThreadPriority(int)} and 188 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 189 * {@link java.lang.Thread} class. 190 */ 191 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 192 193 /** 194 * Standard priority of audio threads. Applications can not normally 195 * change to this priority. 196 * Use with {@link #setThreadPriority(int)} and 197 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 198 * {@link java.lang.Thread} class. 199 */ 200 public static final int THREAD_PRIORITY_AUDIO = -16; 201 202 /** 203 * Standard priority of the most important audio threads. 204 * Applications can not normally 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_AUDIO = -19; 210 211 /** 212 * Minimum increment to make a priority more favorable. 213 */ 214 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 215 216 /** 217 * Minimum increment to make a priority less favorable. 218 */ 219 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 220 221 /** 222 * Default thread group - gets a 'normal' share of the CPU 223 * @hide 224 */ 225 public static final int THREAD_GROUP_DEFAULT = 0; 226 227 /** 228 * Background non-interactive thread group - All threads in 229 * this group are scheduled with a reduced share of the CPU. 230 * @hide 231 */ 232 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 1; 233 234 /** 235 * Foreground 'boost' thread group - All threads in 236 * this group are scheduled with an increased share of the CPU 237 * @hide 238 **/ 239 public static final int THREAD_GROUP_FG_BOOST = 2; 240 241 public static final int SIGNAL_QUIT = 3; 242 public static final int SIGNAL_KILL = 9; 243 public static final int SIGNAL_USR1 = 10; 244 245 // State for communicating with zygote process 246 247 static LocalSocket sZygoteSocket; 248 static DataInputStream sZygoteInputStream; 249 static BufferedWriter sZygoteWriter; 250 251 /** true if previous zygote open failed */ 252 static boolean sPreviousZygoteOpenFailed; 253 254 /** 255 * Start a new process. 256 * 257 * <p>If processes are enabled, a new process is created and the 258 * static main() function of a <var>processClass</var> is executed there. 259 * The process will continue running after this function returns. 260 * 261 * <p>If processes are not enabled, a new thread in the caller's 262 * process is created and main() of <var>processClass</var> called there. 263 * 264 * <p>The niceName parameter, if not an empty string, is a custom name to 265 * give to the process instead of using processClass. This allows you to 266 * make easily identifyable processes even if you are using the same base 267 * <var>processClass</var> to start them. 268 * 269 * @param processClass The class to use as the process's main entry 270 * point. 271 * @param niceName A more readable name to use for the process. 272 * @param uid The user-id under which the process will run. 273 * @param gid The group-id under which the process will run. 274 * @param gids Additional group-ids associated with the process. 275 * @param debugFlags Additional flags. 276 * @param targetSdkVersion The target SDK version for the app. 277 * @param zygoteArgs Additional arguments to supply to the zygote process. 278 * 279 * @return int If > 0 the pid of the new process; if 0 the process is 280 * being emulated by a thread 281 * @throws RuntimeException on fatal start failure 282 * 283 * {@hide} 284 */ 285 public static final int start(final String processClass, 286 final String niceName, 287 int uid, int gid, int[] gids, 288 int debugFlags, int targetSdkVersion, 289 String[] zygoteArgs) 290 { 291 if (supportsProcesses()) { 292 try { 293 return startViaZygote(processClass, niceName, uid, gid, gids, 294 debugFlags, targetSdkVersion, zygoteArgs); 295 } catch (ZygoteStartFailedEx ex) { 296 Log.e(LOG_TAG, 297 "Starting VM process through Zygote failed"); 298 throw new RuntimeException( 299 "Starting VM process through Zygote failed", ex); 300 } 301 } else { 302 // Running in single-process mode 303 304 Runnable runnable = new Runnable() { 305 public void run() { 306 Process.invokeStaticMain(processClass); 307 } 308 }; 309 310 // Thread constructors must not be called with null names (see spec). 311 if (niceName != null) { 312 new Thread(runnable, niceName).start(); 313 } else { 314 new Thread(runnable).start(); 315 } 316 317 return 0; 318 } 319 } 320 321 /** 322 * Start a new process. Don't supply a custom nice name. 323 * {@hide} 324 */ 325 public static final int start(String processClass, int uid, int gid, 326 int[] gids, int debugFlags, int targetSdkVersion, 327 String[] zygoteArgs) { 328 return start(processClass, "", uid, gid, gids, 329 debugFlags, targetSdkVersion, zygoteArgs); 330 } 331 332 private static void invokeStaticMain(String className) { 333 Class cl; 334 Object args[] = new Object[1]; 335 336 args[0] = new String[0]; //this is argv 337 338 try { 339 cl = Class.forName(className); 340 cl.getMethod("main", new Class[] { String[].class }) 341 .invoke(null, args); 342 } catch (Exception ex) { 343 // can be: ClassNotFoundException, 344 // NoSuchMethodException, SecurityException, 345 // IllegalAccessException, IllegalArgumentException 346 // InvocationTargetException 347 // or uncaught exception from main() 348 349 Log.e(LOG_TAG, "Exception invoking static main on " 350 + className, ex); 351 352 throw new RuntimeException(ex); 353 } 354 355 } 356 357 /** retry interval for opening a zygote socket */ 358 static final int ZYGOTE_RETRY_MILLIS = 500; 359 360 /** 361 * Tries to open socket to Zygote process if not already open. If 362 * already open, does nothing. May block and retry. 363 */ 364 private static void openZygoteSocketIfNeeded() 365 throws ZygoteStartFailedEx { 366 367 int retryCount; 368 369 if (sPreviousZygoteOpenFailed) { 370 /* 371 * If we've failed before, expect that we'll fail again and 372 * don't pause for retries. 373 */ 374 retryCount = 0; 375 } else { 376 retryCount = 10; 377 } 378 379 /* 380 * See bug #811181: Sometimes runtime can make it up before zygote. 381 * Really, we'd like to do something better to avoid this condition, 382 * but for now just wait a bit... 383 */ 384 for (int retry = 0 385 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 386 ; retry++ ) { 387 388 if (retry > 0) { 389 try { 390 Log.i("Zygote", "Zygote not up yet, sleeping..."); 391 Thread.sleep(ZYGOTE_RETRY_MILLIS); 392 } catch (InterruptedException ex) { 393 // should never happen 394 } 395 } 396 397 try { 398 sZygoteSocket = new LocalSocket(); 399 400 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 401 LocalSocketAddress.Namespace.RESERVED)); 402 403 sZygoteInputStream 404 = new DataInputStream(sZygoteSocket.getInputStream()); 405 406 sZygoteWriter = 407 new BufferedWriter( 408 new OutputStreamWriter( 409 sZygoteSocket.getOutputStream()), 410 256); 411 412 Log.i("Zygote", "Process: zygote socket opened"); 413 414 sPreviousZygoteOpenFailed = false; 415 break; 416 } catch (IOException ex) { 417 if (sZygoteSocket != null) { 418 try { 419 sZygoteSocket.close(); 420 } catch (IOException ex2) { 421 Log.e(LOG_TAG,"I/O exception on close after exception", 422 ex2); 423 } 424 } 425 426 sZygoteSocket = null; 427 } 428 } 429 430 if (sZygoteSocket == null) { 431 sPreviousZygoteOpenFailed = true; 432 throw new ZygoteStartFailedEx("connect failed"); 433 } 434 } 435 436 /** 437 * Sends an argument list to the zygote process, which starts a new child 438 * and returns the child's pid. Please note: the present implementation 439 * replaces newlines in the argument list with spaces. 440 * @param args argument list 441 * @return PID of new child process 442 * @throws ZygoteStartFailedEx if process start failed for any reason 443 */ 444 private static int zygoteSendArgsAndGetPid(ArrayList<String> args) 445 throws ZygoteStartFailedEx { 446 447 int pid; 448 449 openZygoteSocketIfNeeded(); 450 451 try { 452 /** 453 * See com.android.internal.os.ZygoteInit.readArgumentList() 454 * Presently the wire format to the zygote process is: 455 * a) a count of arguments (argc, in essence) 456 * b) a number of newline-separated argument strings equal to count 457 * 458 * After the zygote process reads these it will write the pid of 459 * the child or -1 on failure. 460 */ 461 462 sZygoteWriter.write(Integer.toString(args.size())); 463 sZygoteWriter.newLine(); 464 465 int sz = args.size(); 466 for (int i = 0; i < sz; i++) { 467 String arg = args.get(i); 468 if (arg.indexOf('\n') >= 0) { 469 throw new ZygoteStartFailedEx( 470 "embedded newlines not allowed"); 471 } 472 sZygoteWriter.write(arg); 473 sZygoteWriter.newLine(); 474 } 475 476 sZygoteWriter.flush(); 477 478 // Should there be a timeout on this? 479 pid = sZygoteInputStream.readInt(); 480 481 if (pid < 0) { 482 throw new ZygoteStartFailedEx("fork() failed"); 483 } 484 } catch (IOException ex) { 485 try { 486 if (sZygoteSocket != null) { 487 sZygoteSocket.close(); 488 } 489 } catch (IOException ex2) { 490 // we're going to fail anyway 491 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 492 } 493 494 sZygoteSocket = null; 495 496 throw new ZygoteStartFailedEx(ex); 497 } 498 499 return pid; 500 } 501 502 /** 503 * Starts a new process via the zygote mechanism. 504 * 505 * @param processClass Class name whose static main() to run 506 * @param niceName 'nice' process name to appear in ps 507 * @param uid a POSIX uid that the new process should setuid() to 508 * @param gid a POSIX gid that the new process shuold setgid() to 509 * @param gids null-ok; a list of supplementary group IDs that the 510 * new process should setgroup() to. 511 * @param debugFlags Additional flags. 512 * @param targetSdkVersion The target SDK version for the app. 513 * @param extraArgs Additional arguments to supply to the zygote process. 514 * @return PID 515 * @throws ZygoteStartFailedEx if process start failed for any reason 516 */ 517 private static int startViaZygote(final String processClass, 518 final String niceName, 519 final int uid, final int gid, 520 final int[] gids, 521 int debugFlags, int targetSdkVersion, 522 String[] extraArgs) 523 throws ZygoteStartFailedEx { 524 int pid; 525 526 synchronized(Process.class) { 527 ArrayList<String> argsForZygote = new ArrayList<String>(); 528 529 // --runtime-init, --setuid=, --setgid=, 530 // and --setgroups= must go first 531 argsForZygote.add("--runtime-init"); 532 argsForZygote.add("--setuid=" + uid); 533 argsForZygote.add("--setgid=" + gid); 534 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 535 argsForZygote.add("--enable-jni-logging"); 536 } 537 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 538 argsForZygote.add("--enable-safemode"); 539 } 540 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 541 argsForZygote.add("--enable-debugger"); 542 } 543 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 544 argsForZygote.add("--enable-checkjni"); 545 } 546 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 547 argsForZygote.add("--enable-assert"); 548 } 549 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 550 551 //TODO optionally enable debuger 552 //argsForZygote.add("--enable-debugger"); 553 554 // --setgroups is a comma-separated list 555 if (gids != null && gids.length > 0) { 556 StringBuilder sb = new StringBuilder(); 557 sb.append("--setgroups="); 558 559 int sz = gids.length; 560 for (int i = 0; i < sz; i++) { 561 if (i != 0) { 562 sb.append(','); 563 } 564 sb.append(gids[i]); 565 } 566 567 argsForZygote.add(sb.toString()); 568 } 569 570 if (niceName != null) { 571 argsForZygote.add("--nice-name=" + niceName); 572 } 573 574 argsForZygote.add(processClass); 575 576 if (extraArgs != null) { 577 for (String arg : extraArgs) { 578 argsForZygote.add(arg); 579 } 580 } 581 582 pid = zygoteSendArgsAndGetPid(argsForZygote); 583 } 584 585 if (pid <= 0) { 586 throw new ZygoteStartFailedEx("zygote start failed:" + pid); 587 } 588 589 return pid; 590 } 591 592 /** 593 * Returns elapsed milliseconds of the time this process has run. 594 * @return Returns the number of milliseconds this process has return. 595 */ 596 public static final native long getElapsedCpuTime(); 597 598 /** 599 * Returns the identifier of this process, which can be used with 600 * {@link #killProcess} and {@link #sendSignal}. 601 */ 602 public static final native int myPid(); 603 604 /** 605 * Returns the identifier of the calling thread, which be used with 606 * {@link #setThreadPriority(int, int)}. 607 */ 608 public static final native int myTid(); 609 610 /** 611 * Returns the identifier of this process's user. 612 */ 613 public static final native int myUid(); 614 615 /** 616 * Returns the UID assigned to a particular user name, or -1 if there is 617 * none. If the given string consists of only numbers, it is converted 618 * directly to a uid. 619 */ 620 public static final native int getUidForName(String name); 621 622 /** 623 * Returns the GID assigned to a particular user name, or -1 if there is 624 * none. If the given string consists of only numbers, it is converted 625 * directly to a gid. 626 */ 627 public static final native int getGidForName(String name); 628 629 /** 630 * Returns a uid for a currently running process. 631 * @param pid the process id 632 * @return the uid of the process, or -1 if the process is not running. 633 * @hide pending API council review 634 */ 635 public static final int getUidForPid(int pid) { 636 String[] procStatusLabels = { "Uid:" }; 637 long[] procStatusValues = new long[1]; 638 procStatusValues[0] = -1; 639 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 640 return (int) procStatusValues[0]; 641 } 642 643 /** 644 * Returns the parent process id for a currently running process. 645 * @param pid the process id 646 * @return the parent process id of the process, or -1 if the process is not running. 647 * @hide 648 */ 649 public static final int getParentPid(int pid) { 650 String[] procStatusLabels = { "PPid:" }; 651 long[] procStatusValues = new long[1]; 652 procStatusValues[0] = -1; 653 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 654 return (int) procStatusValues[0]; 655 } 656 657 /** 658 * Set the priority of a thread, based on Linux priorities. 659 * 660 * @param tid The identifier of the thread/process to change. 661 * @param priority A Linux priority level, from -20 for highest scheduling 662 * priority to 19 for lowest scheduling priority. 663 * 664 * @throws IllegalArgumentException Throws IllegalArgumentException if 665 * <var>tid</var> does not exist. 666 * @throws SecurityException Throws SecurityException if your process does 667 * not have permission to modify the given thread, or to use the given 668 * priority. 669 */ 670 public static final native void setThreadPriority(int tid, int priority) 671 throws IllegalArgumentException, SecurityException; 672 673 /** 674 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 675 * throw an exception if passed a background-level thread priority. This is only 676 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 677 * 678 * @hide 679 */ 680 public static final native void setCanSelfBackground(boolean backgroundOk); 681 682 /** 683 * Sets the scheduling group for a thread. 684 * @hide 685 * @param tid The indentifier of the thread/process to change. 686 * @param group The target group for this thread/process. 687 * 688 * @throws IllegalArgumentException Throws IllegalArgumentException if 689 * <var>tid</var> does not exist. 690 * @throws SecurityException Throws SecurityException if your process does 691 * not have permission to modify the given thread, or to use the given 692 * priority. 693 */ 694 public static final native void setThreadGroup(int tid, int group) 695 throws IllegalArgumentException, SecurityException; 696 /** 697 * Sets the scheduling group for a process and all child threads 698 * @hide 699 * @param pid The indentifier of the process to change. 700 * @param group The target group for this process. 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 public static final native void setProcessGroup(int pid, int group) 709 throws IllegalArgumentException, SecurityException; 710 711 /** 712 * Set the priority of the calling thread, based on Linux priorities. See 713 * {@link #setThreadPriority(int, int)} for more information. 714 * 715 * @param priority A Linux priority level, from -20 for highest scheduling 716 * priority to 19 for lowest scheduling priority. 717 * 718 * @throws IllegalArgumentException Throws IllegalArgumentException if 719 * <var>tid</var> does not exist. 720 * @throws SecurityException Throws SecurityException if your process does 721 * not have permission to modify the given thread, or to use the given 722 * priority. 723 * 724 * @see #setThreadPriority(int, int) 725 */ 726 public static final native void setThreadPriority(int priority) 727 throws IllegalArgumentException, SecurityException; 728 729 /** 730 * Return the current priority of a thread, based on Linux priorities. 731 * 732 * @param tid The identifier of the thread/process to change. 733 * 734 * @return Returns the current priority, as a Linux priority level, 735 * from -20 for highest scheduling priority to 19 for lowest scheduling 736 * priority. 737 * 738 * @throws IllegalArgumentException Throws IllegalArgumentException if 739 * <var>tid</var> does not exist. 740 */ 741 public static final native int getThreadPriority(int tid) 742 throws IllegalArgumentException; 743 744 /** 745 * Determine whether the current environment supports multiple processes. 746 * 747 * @return Returns true if the system can run in multiple processes, else 748 * false if everything is running in a single process. 749 */ 750 public static final native boolean supportsProcesses(); 751 752 /** 753 * Set the out-of-memory badness adjustment for a process. 754 * 755 * @param pid The process identifier to set. 756 * @param amt Adjustment value -- linux allows -16 to +15. 757 * 758 * @return Returns true if the underlying system supports this 759 * feature, else false. 760 * 761 * {@hide} 762 */ 763 public static final native boolean setOomAdj(int pid, int amt); 764 765 /** 766 * Change this process's argv[0] parameter. This can be useful to show 767 * more descriptive information in things like the 'ps' command. 768 * 769 * @param text The new name of this process. 770 * 771 * {@hide} 772 */ 773 public static final native void setArgV0(String text); 774 775 /** 776 * Kill the process with the given PID. 777 * Note that, though this API allows us to request to 778 * kill any process based on its PID, the kernel will 779 * still impose standard restrictions on which PIDs you 780 * are actually able to kill. Typically this means only 781 * the process running the caller's packages/application 782 * and any additional processes created by that app; packages 783 * sharing a common UID will also be able to kill each 784 * other's processes. 785 */ 786 public static final void killProcess(int pid) { 787 sendSignal(pid, SIGNAL_KILL); 788 } 789 790 /** @hide */ 791 public static final native int setUid(int uid); 792 793 /** @hide */ 794 public static final native int setGid(int uid); 795 796 /** 797 * Send a signal to the given process. 798 * 799 * @param pid The pid of the target process. 800 * @param signal The signal to send. 801 */ 802 public static final native void sendSignal(int pid, int signal); 803 804 /** 805 * @hide 806 * Private impl for avoiding a log message... DO NOT USE without doing 807 * your own log, or the Android Illuminati will find you some night and 808 * beat you up. 809 */ 810 public static final void killProcessQuiet(int pid) { 811 sendSignalQuiet(pid, SIGNAL_KILL); 812 } 813 814 /** 815 * @hide 816 * Private impl for avoiding a log message... DO NOT USE without doing 817 * your own log, or the Android Illuminati will find you some night and 818 * beat you up. 819 */ 820 public static final native void sendSignalQuiet(int pid, int signal); 821 822 /** @hide */ 823 public static final native long getFreeMemory(); 824 825 /** @hide */ 826 public static final native void readProcLines(String path, 827 String[] reqFields, long[] outSizes); 828 829 /** @hide */ 830 public static final native int[] getPids(String path, int[] lastArray); 831 832 /** @hide */ 833 public static final int PROC_TERM_MASK = 0xff; 834 /** @hide */ 835 public static final int PROC_ZERO_TERM = 0; 836 /** @hide */ 837 public static final int PROC_SPACE_TERM = (int)' '; 838 /** @hide */ 839 public static final int PROC_TAB_TERM = (int)'\t'; 840 /** @hide */ 841 public static final int PROC_COMBINE = 0x100; 842 /** @hide */ 843 public static final int PROC_PARENS = 0x200; 844 /** @hide */ 845 public static final int PROC_OUT_STRING = 0x1000; 846 /** @hide */ 847 public static final int PROC_OUT_LONG = 0x2000; 848 /** @hide */ 849 public static final int PROC_OUT_FLOAT = 0x4000; 850 851 /** @hide */ 852 public static final native boolean readProcFile(String file, int[] format, 853 String[] outStrings, long[] outLongs, float[] outFloats); 854 855 /** @hide */ 856 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 857 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 858 859 /** 860 * Gets the total Pss value for a given process, in bytes. 861 * 862 * @param pid the process to the Pss for 863 * @return the total Pss value for the given process in bytes, 864 * or -1 if the value cannot be determined 865 * @hide 866 */ 867 public static final native long getPss(int pid); 868} 869