Process.java revision 3f9dd287b99340efaaa257759e71a8f81b2ed113
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 GID for the group that allows write access to the SD card. 90 * @hide 91 */ 92 public static final int SDCARD_RW_GID = 1015; 93 94 /** 95 * Defines the UID/GID for the NFC service process. 96 * @hide 97 */ 98 public static final int NFC_UID = 1025; 99 100 /** 101 * Defines the GID for the group that allows write access to the internal media storage. 102 * @hide 103 */ 104 public static final int MEDIA_RW_GID = 1023; 105 106 /** 107 * Defines the start of a range of UIDs (and GIDs), going from this 108 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 109 * to applications. 110 */ 111 public static final int FIRST_APPLICATION_UID = 10000; 112 /** 113 * Last of application-specific UIDs starting at 114 * {@link #FIRST_APPLICATION_UID}. 115 */ 116 public static final int LAST_APPLICATION_UID = 99999; 117 118 /** 119 * Defines a secondary group id for access to the bluetooth hardware. 120 */ 121 public static final int BLUETOOTH_GID = 2000; 122 123 /** 124 * Standard priority of application threads. 125 * Use with {@link #setThreadPriority(int)} and 126 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 127 * {@link java.lang.Thread} class. 128 */ 129 public static final int THREAD_PRIORITY_DEFAULT = 0; 130 131 /* 132 * *************************************** 133 * ** Keep in sync with utils/threads.h ** 134 * *************************************** 135 */ 136 137 /** 138 * Lowest available thread priority. Only for those who really, really 139 * don't want to run if anything else is happening. 140 * Use with {@link #setThreadPriority(int)} and 141 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 142 * {@link java.lang.Thread} class. 143 */ 144 public static final int THREAD_PRIORITY_LOWEST = 19; 145 146 /** 147 * Standard priority background threads. This gives your thread a slightly 148 * lower than normal priority, so that it will have less chance of impacting 149 * the responsiveness of the user interface. 150 * Use with {@link #setThreadPriority(int)} and 151 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 152 * {@link java.lang.Thread} class. 153 */ 154 public static final int THREAD_PRIORITY_BACKGROUND = 10; 155 156 /** 157 * Standard priority of threads that are currently running a user interface 158 * that the user is interacting with. Applications can not normally 159 * change to this priority; the system will automatically adjust your 160 * application threads as the user moves through the UI. 161 * Use with {@link #setThreadPriority(int)} and 162 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 163 * {@link java.lang.Thread} class. 164 */ 165 public static final int THREAD_PRIORITY_FOREGROUND = -2; 166 167 /** 168 * Standard priority of system display threads, involved in updating 169 * the user interface. Applications can not 170 * normally change to this priority. 171 * Use with {@link #setThreadPriority(int)} and 172 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 173 * {@link java.lang.Thread} class. 174 */ 175 public static final int THREAD_PRIORITY_DISPLAY = -4; 176 177 /** 178 * Standard priority of the most important display threads, for compositing 179 * the screen and retrieving input events. Applications can not normally 180 * change to this priority. 181 * Use with {@link #setThreadPriority(int)} and 182 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 183 * {@link java.lang.Thread} class. 184 */ 185 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 186 187 /** 188 * Standard priority of audio threads. Applications can not normally 189 * change to this priority. 190 * Use with {@link #setThreadPriority(int)} and 191 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 192 * {@link java.lang.Thread} class. 193 */ 194 public static final int THREAD_PRIORITY_AUDIO = -16; 195 196 /** 197 * Standard priority of the most important audio threads. 198 * Applications can not normally 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_AUDIO = -19; 204 205 /** 206 * Minimum increment to make a priority more favorable. 207 */ 208 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 209 210 /** 211 * Minimum increment to make a priority less favorable. 212 */ 213 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 214 215 /** 216 * Default thread group - gets a 'normal' share of the CPU 217 * @hide 218 */ 219 public static final int THREAD_GROUP_DEFAULT = 0; 220 221 /** 222 * Background non-interactive thread group - All threads in 223 * this group are scheduled with a reduced share of the CPU. 224 * @hide 225 */ 226 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 1; 227 228 /** 229 * Foreground 'boost' thread group - All threads in 230 * this group are scheduled with an increased share of the CPU 231 * @hide 232 **/ 233 public static final int THREAD_GROUP_FG_BOOST = 2; 234 235 public static final int SIGNAL_QUIT = 3; 236 public static final int SIGNAL_KILL = 9; 237 public static final int SIGNAL_USR1 = 10; 238 239 // State for communicating with zygote process 240 241 static LocalSocket sZygoteSocket; 242 static DataInputStream sZygoteInputStream; 243 static BufferedWriter sZygoteWriter; 244 245 /** true if previous zygote open failed */ 246 static boolean sPreviousZygoteOpenFailed; 247 248 /** 249 * Start a new process. 250 * 251 * <p>If processes are enabled, a new process is created and the 252 * static main() function of a <var>processClass</var> is executed there. 253 * The process will continue running after this function returns. 254 * 255 * <p>If processes are not enabled, a new thread in the caller's 256 * process is created and main() of <var>processClass</var> called there. 257 * 258 * <p>The niceName parameter, if not an empty string, is a custom name to 259 * give to the process instead of using processClass. This allows you to 260 * make easily identifyable processes even if you are using the same base 261 * <var>processClass</var> to start them. 262 * 263 * @param processClass The class to use as the process's main entry 264 * point. 265 * @param niceName A more readable name to use for the process. 266 * @param uid The user-id under which the process will run. 267 * @param gid The group-id under which the process will run. 268 * @param gids Additional group-ids associated with the process. 269 * @param debugFlags Additional flags. 270 * @param targetSdkVersion The target SDK version for the app. 271 * @param zygoteArgs Additional arguments to supply to the zygote process. 272 * 273 * @return An object that describes the result of the attempt to start the process. 274 * @throws RuntimeException on fatal start failure 275 * 276 * {@hide} 277 */ 278 public static final ProcessStartResult start(final String processClass, 279 final String niceName, 280 int uid, int gid, int[] gids, 281 int debugFlags, int targetSdkVersion, 282 String[] zygoteArgs) { 283 try { 284 return startViaZygote(processClass, niceName, uid, gid, gids, 285 debugFlags, targetSdkVersion, zygoteArgs); 286 } catch (ZygoteStartFailedEx ex) { 287 Log.e(LOG_TAG, 288 "Starting VM process through Zygote failed"); 289 throw new RuntimeException( 290 "Starting VM process through Zygote failed", ex); 291 } 292 } 293 294 /** retry interval for opening a zygote socket */ 295 static final int ZYGOTE_RETRY_MILLIS = 500; 296 297 /** 298 * Tries to open socket to Zygote process if not already open. If 299 * already open, does nothing. May block and retry. 300 */ 301 private static void openZygoteSocketIfNeeded() 302 throws ZygoteStartFailedEx { 303 304 int retryCount; 305 306 if (sPreviousZygoteOpenFailed) { 307 /* 308 * If we've failed before, expect that we'll fail again and 309 * don't pause for retries. 310 */ 311 retryCount = 0; 312 } else { 313 retryCount = 10; 314 } 315 316 /* 317 * See bug #811181: Sometimes runtime can make it up before zygote. 318 * Really, we'd like to do something better to avoid this condition, 319 * but for now just wait a bit... 320 */ 321 for (int retry = 0 322 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 323 ; retry++ ) { 324 325 if (retry > 0) { 326 try { 327 Log.i("Zygote", "Zygote not up yet, sleeping..."); 328 Thread.sleep(ZYGOTE_RETRY_MILLIS); 329 } catch (InterruptedException ex) { 330 // should never happen 331 } 332 } 333 334 try { 335 sZygoteSocket = new LocalSocket(); 336 337 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 338 LocalSocketAddress.Namespace.RESERVED)); 339 340 sZygoteInputStream 341 = new DataInputStream(sZygoteSocket.getInputStream()); 342 343 sZygoteWriter = 344 new BufferedWriter( 345 new OutputStreamWriter( 346 sZygoteSocket.getOutputStream()), 347 256); 348 349 Log.i("Zygote", "Process: zygote socket opened"); 350 351 sPreviousZygoteOpenFailed = false; 352 break; 353 } catch (IOException ex) { 354 if (sZygoteSocket != null) { 355 try { 356 sZygoteSocket.close(); 357 } catch (IOException ex2) { 358 Log.e(LOG_TAG,"I/O exception on close after exception", 359 ex2); 360 } 361 } 362 363 sZygoteSocket = null; 364 } 365 } 366 367 if (sZygoteSocket == null) { 368 sPreviousZygoteOpenFailed = true; 369 throw new ZygoteStartFailedEx("connect failed"); 370 } 371 } 372 373 /** 374 * Sends an argument list to the zygote process, which starts a new child 375 * and returns the child's pid. Please note: the present implementation 376 * replaces newlines in the argument list with spaces. 377 * @param args argument list 378 * @return An object that describes the result of the attempt to start the process. 379 * @throws ZygoteStartFailedEx if process start failed for any reason 380 */ 381 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 382 throws ZygoteStartFailedEx { 383 openZygoteSocketIfNeeded(); 384 385 try { 386 /** 387 * See com.android.internal.os.ZygoteInit.readArgumentList() 388 * Presently the wire format to the zygote process is: 389 * a) a count of arguments (argc, in essence) 390 * b) a number of newline-separated argument strings equal to count 391 * 392 * After the zygote process reads these it will write the pid of 393 * the child or -1 on failure, followed by boolean to 394 * indicate whether a wrapper process was used. 395 */ 396 397 sZygoteWriter.write(Integer.toString(args.size())); 398 sZygoteWriter.newLine(); 399 400 int sz = args.size(); 401 for (int i = 0; i < sz; i++) { 402 String arg = args.get(i); 403 if (arg.indexOf('\n') >= 0) { 404 throw new ZygoteStartFailedEx( 405 "embedded newlines not allowed"); 406 } 407 sZygoteWriter.write(arg); 408 sZygoteWriter.newLine(); 409 } 410 411 sZygoteWriter.flush(); 412 413 // Should there be a timeout on this? 414 ProcessStartResult result = new ProcessStartResult(); 415 result.pid = sZygoteInputStream.readInt(); 416 if (result.pid < 0) { 417 throw new ZygoteStartFailedEx("fork() failed"); 418 } 419 result.usingWrapper = sZygoteInputStream.readBoolean(); 420 return result; 421 } catch (IOException ex) { 422 try { 423 if (sZygoteSocket != null) { 424 sZygoteSocket.close(); 425 } 426 } catch (IOException ex2) { 427 // we're going to fail anyway 428 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 429 } 430 431 sZygoteSocket = null; 432 433 throw new ZygoteStartFailedEx(ex); 434 } 435 } 436 437 /** 438 * Starts a new process via the zygote mechanism. 439 * 440 * @param processClass Class name whose static main() to run 441 * @param niceName 'nice' process name to appear in ps 442 * @param uid a POSIX uid that the new process should setuid() to 443 * @param gid a POSIX gid that the new process shuold setgid() to 444 * @param gids null-ok; a list of supplementary group IDs that the 445 * new process should setgroup() to. 446 * @param debugFlags Additional flags. 447 * @param targetSdkVersion The target SDK version for the app. 448 * @param extraArgs Additional arguments to supply to the zygote process. 449 * @return An object that describes the result of the attempt to start the process. 450 * @throws ZygoteStartFailedEx if process start failed for any reason 451 */ 452 private static ProcessStartResult startViaZygote(final String processClass, 453 final String niceName, 454 final int uid, final int gid, 455 final int[] gids, 456 int debugFlags, int targetSdkVersion, 457 String[] extraArgs) 458 throws ZygoteStartFailedEx { 459 synchronized(Process.class) { 460 ArrayList<String> argsForZygote = new ArrayList<String>(); 461 462 // --runtime-init, --setuid=, --setgid=, 463 // and --setgroups= must go first 464 argsForZygote.add("--runtime-init"); 465 argsForZygote.add("--setuid=" + uid); 466 argsForZygote.add("--setgid=" + gid); 467 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 468 argsForZygote.add("--enable-jni-logging"); 469 } 470 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 471 argsForZygote.add("--enable-safemode"); 472 } 473 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 474 argsForZygote.add("--enable-debugger"); 475 } 476 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 477 argsForZygote.add("--enable-checkjni"); 478 } 479 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 480 argsForZygote.add("--enable-assert"); 481 } 482 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 483 484 //TODO optionally enable debuger 485 //argsForZygote.add("--enable-debugger"); 486 487 // --setgroups is a comma-separated list 488 if (gids != null && gids.length > 0) { 489 StringBuilder sb = new StringBuilder(); 490 sb.append("--setgroups="); 491 492 int sz = gids.length; 493 for (int i = 0; i < sz; i++) { 494 if (i != 0) { 495 sb.append(','); 496 } 497 sb.append(gids[i]); 498 } 499 500 argsForZygote.add(sb.toString()); 501 } 502 503 if (niceName != null) { 504 argsForZygote.add("--nice-name=" + niceName); 505 } 506 507 argsForZygote.add(processClass); 508 509 if (extraArgs != null) { 510 for (String arg : extraArgs) { 511 argsForZygote.add(arg); 512 } 513 } 514 515 return zygoteSendArgsAndGetResult(argsForZygote); 516 } 517 } 518 519 /** 520 * Returns elapsed milliseconds of the time this process has run. 521 * @return Returns the number of milliseconds this process has return. 522 */ 523 public static final native long getElapsedCpuTime(); 524 525 /** 526 * Returns the identifier of this process, which can be used with 527 * {@link #killProcess} and {@link #sendSignal}. 528 */ 529 public static final native int myPid(); 530 531 /** 532 * Returns the identifier of the calling thread, which be used with 533 * {@link #setThreadPriority(int, int)}. 534 */ 535 public static final native int myTid(); 536 537 /** 538 * Returns the identifier of this process's user. 539 */ 540 public static final native int myUid(); 541 542 /** 543 * Returns the UID assigned to a particular user name, or -1 if there is 544 * none. If the given string consists of only numbers, it is converted 545 * directly to a uid. 546 */ 547 public static final native int getUidForName(String name); 548 549 /** 550 * Returns the GID assigned to a particular user name, or -1 if there is 551 * none. If the given string consists of only numbers, it is converted 552 * directly to a gid. 553 */ 554 public static final native int getGidForName(String name); 555 556 /** 557 * Returns a uid for a currently running process. 558 * @param pid the process id 559 * @return the uid of the process, or -1 if the process is not running. 560 * @hide pending API council review 561 */ 562 public static final int getUidForPid(int pid) { 563 String[] procStatusLabels = { "Uid:" }; 564 long[] procStatusValues = new long[1]; 565 procStatusValues[0] = -1; 566 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 567 return (int) procStatusValues[0]; 568 } 569 570 /** 571 * Returns the parent process id for a currently running process. 572 * @param pid the process id 573 * @return the parent process id of the process, or -1 if the process is not running. 574 * @hide 575 */ 576 public static final int getParentPid(int pid) { 577 String[] procStatusLabels = { "PPid:" }; 578 long[] procStatusValues = new long[1]; 579 procStatusValues[0] = -1; 580 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 581 return (int) procStatusValues[0]; 582 } 583 584 /** 585 * Set the priority of a thread, based on Linux priorities. 586 * 587 * @param tid The identifier of the thread/process to change. 588 * @param priority A Linux priority level, from -20 for highest scheduling 589 * priority to 19 for lowest scheduling priority. 590 * 591 * @throws IllegalArgumentException Throws IllegalArgumentException if 592 * <var>tid</var> does not exist. 593 * @throws SecurityException Throws SecurityException if your process does 594 * not have permission to modify the given thread, or to use the given 595 * priority. 596 */ 597 public static final native void setThreadPriority(int tid, int priority) 598 throws IllegalArgumentException, SecurityException; 599 600 /** 601 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 602 * throw an exception if passed a background-level thread priority. This is only 603 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 604 * 605 * @hide 606 */ 607 public static final native void setCanSelfBackground(boolean backgroundOk); 608 609 /** 610 * Sets the scheduling group for a thread. 611 * @hide 612 * @param tid The indentifier of the thread/process to change. 613 * @param group The target group for this thread/process. 614 * 615 * @throws IllegalArgumentException Throws IllegalArgumentException if 616 * <var>tid</var> does not exist. 617 * @throws SecurityException Throws SecurityException if your process does 618 * not have permission to modify the given thread, or to use the given 619 * priority. 620 */ 621 public static final native void setThreadGroup(int tid, int group) 622 throws IllegalArgumentException, SecurityException; 623 /** 624 * Sets the scheduling group for a process and all child threads 625 * @hide 626 * @param pid The indentifier of the process to change. 627 * @param group The target group for this process. 628 * 629 * @throws IllegalArgumentException Throws IllegalArgumentException if 630 * <var>tid</var> does not exist. 631 * @throws SecurityException Throws SecurityException if your process does 632 * not have permission to modify the given thread, or to use the given 633 * priority. 634 */ 635 public static final native void setProcessGroup(int pid, int group) 636 throws IllegalArgumentException, SecurityException; 637 638 /** 639 * Set the priority of the calling thread, based on Linux priorities. See 640 * {@link #setThreadPriority(int, int)} for more information. 641 * 642 * @param priority A Linux priority level, from -20 for highest scheduling 643 * priority to 19 for lowest scheduling priority. 644 * 645 * @throws IllegalArgumentException Throws IllegalArgumentException if 646 * <var>tid</var> does not exist. 647 * @throws SecurityException Throws SecurityException if your process does 648 * not have permission to modify the given thread, or to use the given 649 * priority. 650 * 651 * @see #setThreadPriority(int, int) 652 */ 653 public static final native void setThreadPriority(int priority) 654 throws IllegalArgumentException, SecurityException; 655 656 /** 657 * Return the current priority of a thread, based on Linux priorities. 658 * 659 * @param tid The identifier of the thread/process to change. 660 * 661 * @return Returns the current priority, as a Linux priority level, 662 * from -20 for highest scheduling priority to 19 for lowest scheduling 663 * priority. 664 * 665 * @throws IllegalArgumentException Throws IllegalArgumentException if 666 * <var>tid</var> does not exist. 667 */ 668 public static final native int getThreadPriority(int tid) 669 throws IllegalArgumentException; 670 671 /** 672 * Determine whether the current environment supports multiple processes. 673 * 674 * @return Returns true if the system can run in multiple processes, else 675 * false if everything is running in a single process. 676 * 677 * @deprecated This method always returns true. Do not use. 678 */ 679 @Deprecated 680 public static final boolean supportsProcesses() { 681 return true; 682 } 683 684 /** 685 * Set the out-of-memory badness adjustment for a process. 686 * 687 * @param pid The process identifier to set. 688 * @param amt Adjustment value -- linux allows -16 to +15. 689 * 690 * @return Returns true if the underlying system supports this 691 * feature, else false. 692 * 693 * {@hide} 694 */ 695 public static final native boolean setOomAdj(int pid, int amt); 696 697 /** 698 * Change this process's argv[0] parameter. This can be useful to show 699 * more descriptive information in things like the 'ps' command. 700 * 701 * @param text The new name of this process. 702 * 703 * {@hide} 704 */ 705 public static final native void setArgV0(String text); 706 707 /** 708 * Kill the process with the given PID. 709 * Note that, though this API allows us to request to 710 * kill any process based on its PID, the kernel will 711 * still impose standard restrictions on which PIDs you 712 * are actually able to kill. Typically this means only 713 * the process running the caller's packages/application 714 * and any additional processes created by that app; packages 715 * sharing a common UID will also be able to kill each 716 * other's processes. 717 */ 718 public static final void killProcess(int pid) { 719 sendSignal(pid, SIGNAL_KILL); 720 } 721 722 /** @hide */ 723 public static final native int setUid(int uid); 724 725 /** @hide */ 726 public static final native int setGid(int uid); 727 728 /** 729 * Send a signal to the given process. 730 * 731 * @param pid The pid of the target process. 732 * @param signal The signal to send. 733 */ 734 public static final native void sendSignal(int pid, int signal); 735 736 /** 737 * @hide 738 * Private impl for avoiding a log message... DO NOT USE without doing 739 * your own log, or the Android Illuminati will find you some night and 740 * beat you up. 741 */ 742 public static final void killProcessQuiet(int pid) { 743 sendSignalQuiet(pid, SIGNAL_KILL); 744 } 745 746 /** 747 * @hide 748 * Private impl for avoiding a log message... DO NOT USE without doing 749 * your own log, or the Android Illuminati will find you some night and 750 * beat you up. 751 */ 752 public static final native void sendSignalQuiet(int pid, int signal); 753 754 /** @hide */ 755 public static final native long getFreeMemory(); 756 757 /** @hide */ 758 public static final native void readProcLines(String path, 759 String[] reqFields, long[] outSizes); 760 761 /** @hide */ 762 public static final native int[] getPids(String path, int[] lastArray); 763 764 /** @hide */ 765 public static final int PROC_TERM_MASK = 0xff; 766 /** @hide */ 767 public static final int PROC_ZERO_TERM = 0; 768 /** @hide */ 769 public static final int PROC_SPACE_TERM = (int)' '; 770 /** @hide */ 771 public static final int PROC_TAB_TERM = (int)'\t'; 772 /** @hide */ 773 public static final int PROC_COMBINE = 0x100; 774 /** @hide */ 775 public static final int PROC_PARENS = 0x200; 776 /** @hide */ 777 public static final int PROC_OUT_STRING = 0x1000; 778 /** @hide */ 779 public static final int PROC_OUT_LONG = 0x2000; 780 /** @hide */ 781 public static final int PROC_OUT_FLOAT = 0x4000; 782 783 /** @hide */ 784 public static final native boolean readProcFile(String file, int[] format, 785 String[] outStrings, long[] outLongs, float[] outFloats); 786 787 /** @hide */ 788 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 789 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 790 791 /** 792 * Gets the total Pss value for a given process, in bytes. 793 * 794 * @param pid the process to the Pss for 795 * @return the total Pss value for the given process in bytes, 796 * or -1 if the value cannot be determined 797 * @hide 798 */ 799 public static final native long getPss(int pid); 800 801 /** 802 * Specifies the outcome of having started a process. 803 * @hide 804 */ 805 public static final class ProcessStartResult { 806 /** 807 * The PID of the newly started process. 808 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 809 */ 810 public int pid; 811 812 /** 813 * True if the process was started with a wrapper attached. 814 */ 815 public boolean usingWrapper; 816 } 817} 818