Process.java revision d158214511a3c04753de04fa6389e46d33135c38
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 WIFI supplicant process. 72 * @hide 73 */ 74 public static final int WIFI_UID = 1010; 75 76 /** 77 * Defines the start of a range of UIDs (and GIDs), going from this 78 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 79 * to applications. 80 */ 81 public static final int FIRST_APPLICATION_UID = 10000; 82 /** 83 * Last of application-specific UIDs starting at 84 * {@link #FIRST_APPLICATION_UID}. 85 */ 86 public static final int LAST_APPLICATION_UID = 99999; 87 88 /** 89 * Defines a secondary group id for access to the bluetooth hardware. 90 */ 91 public static final int BLUETOOTH_GID = 2000; 92 93 /** 94 * Standard priority of application threads. 95 * Use with {@link #setThreadPriority(int)} and 96 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 97 * {@link java.lang.Thread} class. 98 */ 99 public static final int THREAD_PRIORITY_DEFAULT = 0; 100 101 /* 102 * *************************************** 103 * ** Keep in sync with utils/threads.h ** 104 * *************************************** 105 */ 106 107 /** 108 * Lowest available thread priority. Only for those who really, really 109 * don't want to run if anything else is happening. 110 * Use with {@link #setThreadPriority(int)} and 111 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 112 * {@link java.lang.Thread} class. 113 */ 114 public static final int THREAD_PRIORITY_LOWEST = 19; 115 116 /** 117 * Standard priority background threads. This gives your thread a slightly 118 * lower than normal priority, so that it will have less chance of impacting 119 * the responsiveness of the user interface. 120 * Use with {@link #setThreadPriority(int)} and 121 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 122 * {@link java.lang.Thread} class. 123 */ 124 public static final int THREAD_PRIORITY_BACKGROUND = 10; 125 126 /** 127 * Standard priority of threads that are currently running a user interface 128 * that the user is interacting with. Applications can not normally 129 * change to this priority; the system will automatically adjust your 130 * application threads as the user moves through the UI. 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_FOREGROUND = -2; 136 137 /** 138 * Standard priority of system display threads, involved in updating 139 * the user interface. Applications can not 140 * normally change to this priority. 141 * Use with {@link #setThreadPriority(int)} and 142 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 143 * {@link java.lang.Thread} class. 144 */ 145 public static final int THREAD_PRIORITY_DISPLAY = -4; 146 147 /** 148 * Standard priority of the most important display threads, for compositing 149 * the screen and retrieving input events. Applications can not normally 150 * change to this priority. 151 * Use with {@link #setThreadPriority(int)} and 152 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 153 * {@link java.lang.Thread} class. 154 */ 155 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 156 157 /** 158 * Standard priority of audio threads. Applications can not normally 159 * change to this priority. 160 * Use with {@link #setThreadPriority(int)} and 161 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 162 * {@link java.lang.Thread} class. 163 */ 164 public static final int THREAD_PRIORITY_AUDIO = -16; 165 166 /** 167 * Standard priority of the most important audio threads. 168 * Applications can not normally change to this priority. 169 * Use with {@link #setThreadPriority(int)} and 170 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 171 * {@link java.lang.Thread} class. 172 */ 173 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 174 175 /** 176 * Minimum increment to make a priority more favorable. 177 */ 178 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 179 180 /** 181 * Minimum increment to make a priority less favorable. 182 */ 183 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 184 185 /** 186 * Default thread group - gets a 'normal' share of the CPU 187 * @hide 188 */ 189 public static final int THREAD_GROUP_DEFAULT = 0; 190 191 /** 192 * Background non-interactive thread group - All threads in 193 * this group are scheduled with a reduced share of the CPU. 194 * @hide 195 */ 196 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 1; 197 198 /** 199 * Foreground 'boost' thread group - All threads in 200 * this group are scheduled with an increased share of the CPU 201 * @hide 202 **/ 203 public static final int THREAD_GROUP_FG_BOOST = 2; 204 205 public static final int SIGNAL_QUIT = 3; 206 public static final int SIGNAL_KILL = 9; 207 public static final int SIGNAL_USR1 = 10; 208 209 // State for communicating with zygote process 210 211 static LocalSocket sZygoteSocket; 212 static DataInputStream sZygoteInputStream; 213 static BufferedWriter sZygoteWriter; 214 215 /** true if previous zygote open failed */ 216 static boolean sPreviousZygoteOpenFailed; 217 218 /** 219 * Start a new process. 220 * 221 * <p>If processes are enabled, a new process is created and the 222 * static main() function of a <var>processClass</var> is executed there. 223 * The process will continue running after this function returns. 224 * 225 * <p>If processes are not enabled, a new thread in the caller's 226 * process is created and main() of <var>processClass</var> called there. 227 * 228 * <p>The niceName parameter, if not an empty string, is a custom name to 229 * give to the process instead of using processClass. This allows you to 230 * make easily identifyable processes even if you are using the same base 231 * <var>processClass</var> to start them. 232 * 233 * @param processClass The class to use as the process's main entry 234 * point. 235 * @param niceName A more readable name to use for the process. 236 * @param uid The user-id under which the process will run. 237 * @param gid The group-id under which the process will run. 238 * @param gids Additional group-ids associated with the process. 239 * @param enableDebugger True if debugging should be enabled for this process. 240 * @param zygoteArgs Additional arguments to supply to the zygote process. 241 * 242 * @return int If > 0 the pid of the new process; if 0 the process is 243 * being emulated by a thread 244 * @throws RuntimeException on fatal start failure 245 * 246 * {@hide} 247 */ 248 public static final int start(final String processClass, 249 final String niceName, 250 int uid, int gid, int[] gids, 251 int debugFlags, 252 String[] zygoteArgs) 253 { 254 if (supportsProcesses()) { 255 try { 256 return startViaZygote(processClass, niceName, uid, gid, gids, 257 debugFlags, zygoteArgs); 258 } catch (ZygoteStartFailedEx ex) { 259 Log.e(LOG_TAG, 260 "Starting VM process through Zygote failed"); 261 throw new RuntimeException( 262 "Starting VM process through Zygote failed", ex); 263 } 264 } else { 265 // Running in single-process mode 266 267 Runnable runnable = new Runnable() { 268 public void run() { 269 Process.invokeStaticMain(processClass); 270 } 271 }; 272 273 // Thread constructors must not be called with null names (see spec). 274 if (niceName != null) { 275 new Thread(runnable, niceName).start(); 276 } else { 277 new Thread(runnable).start(); 278 } 279 280 return 0; 281 } 282 } 283 284 /** 285 * Start a new process. Don't supply a custom nice name. 286 * {@hide} 287 */ 288 public static final int start(String processClass, int uid, int gid, 289 int[] gids, int debugFlags, String[] zygoteArgs) { 290 return start(processClass, "", uid, gid, gids, 291 debugFlags, zygoteArgs); 292 } 293 294 private static void invokeStaticMain(String className) { 295 Class cl; 296 Object args[] = new Object[1]; 297 298 args[0] = new String[0]; //this is argv 299 300 try { 301 cl = Class.forName(className); 302 cl.getMethod("main", new Class[] { String[].class }) 303 .invoke(null, args); 304 } catch (Exception ex) { 305 // can be: ClassNotFoundException, 306 // NoSuchMethodException, SecurityException, 307 // IllegalAccessException, IllegalArgumentException 308 // InvocationTargetException 309 // or uncaught exception from main() 310 311 Log.e(LOG_TAG, "Exception invoking static main on " 312 + className, ex); 313 314 throw new RuntimeException(ex); 315 } 316 317 } 318 319 /** retry interval for opening a zygote socket */ 320 static final int ZYGOTE_RETRY_MILLIS = 500; 321 322 /** 323 * Tries to open socket to Zygote process if not already open. If 324 * already open, does nothing. May block and retry. 325 */ 326 private static void openZygoteSocketIfNeeded() 327 throws ZygoteStartFailedEx { 328 329 int retryCount; 330 331 if (sPreviousZygoteOpenFailed) { 332 /* 333 * If we've failed before, expect that we'll fail again and 334 * don't pause for retries. 335 */ 336 retryCount = 0; 337 } else { 338 retryCount = 10; 339 } 340 341 /* 342 * See bug #811181: Sometimes runtime can make it up before zygote. 343 * Really, we'd like to do something better to avoid this condition, 344 * but for now just wait a bit... 345 */ 346 for (int retry = 0 347 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 348 ; retry++ ) { 349 350 if (retry > 0) { 351 try { 352 Log.i("Zygote", "Zygote not up yet, sleeping..."); 353 Thread.sleep(ZYGOTE_RETRY_MILLIS); 354 } catch (InterruptedException ex) { 355 // should never happen 356 } 357 } 358 359 try { 360 sZygoteSocket = new LocalSocket(); 361 362 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 363 LocalSocketAddress.Namespace.RESERVED)); 364 365 sZygoteInputStream 366 = new DataInputStream(sZygoteSocket.getInputStream()); 367 368 sZygoteWriter = 369 new BufferedWriter( 370 new OutputStreamWriter( 371 sZygoteSocket.getOutputStream()), 372 256); 373 374 Log.i("Zygote", "Process: zygote socket opened"); 375 376 sPreviousZygoteOpenFailed = false; 377 break; 378 } catch (IOException ex) { 379 if (sZygoteSocket != null) { 380 try { 381 sZygoteSocket.close(); 382 } catch (IOException ex2) { 383 Log.e(LOG_TAG,"I/O exception on close after exception", 384 ex2); 385 } 386 } 387 388 sZygoteSocket = null; 389 } 390 } 391 392 if (sZygoteSocket == null) { 393 sPreviousZygoteOpenFailed = true; 394 throw new ZygoteStartFailedEx("connect failed"); 395 } 396 } 397 398 /** 399 * Sends an argument list to the zygote process, which starts a new child 400 * and returns the child's pid. Please note: the present implementation 401 * replaces newlines in the argument list with spaces. 402 * @param args argument list 403 * @return PID of new child process 404 * @throws ZygoteStartFailedEx if process start failed for any reason 405 */ 406 private static int zygoteSendArgsAndGetPid(ArrayList<String> args) 407 throws ZygoteStartFailedEx { 408 409 int pid; 410 411 openZygoteSocketIfNeeded(); 412 413 try { 414 /** 415 * See com.android.internal.os.ZygoteInit.readArgumentList() 416 * Presently the wire format to the zygote process is: 417 * a) a count of arguments (argc, in essence) 418 * b) a number of newline-separated argument strings equal to count 419 * 420 * After the zygote process reads these it will write the pid of 421 * the child or -1 on failure. 422 */ 423 424 sZygoteWriter.write(Integer.toString(args.size())); 425 sZygoteWriter.newLine(); 426 427 int sz = args.size(); 428 for (int i = 0; i < sz; i++) { 429 String arg = args.get(i); 430 if (arg.indexOf('\n') >= 0) { 431 throw new ZygoteStartFailedEx( 432 "embedded newlines not allowed"); 433 } 434 sZygoteWriter.write(arg); 435 sZygoteWriter.newLine(); 436 } 437 438 sZygoteWriter.flush(); 439 440 // Should there be a timeout on this? 441 pid = sZygoteInputStream.readInt(); 442 443 if (pid < 0) { 444 throw new ZygoteStartFailedEx("fork() failed"); 445 } 446 } catch (IOException ex) { 447 try { 448 if (sZygoteSocket != null) { 449 sZygoteSocket.close(); 450 } 451 } catch (IOException ex2) { 452 // we're going to fail anyway 453 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 454 } 455 456 sZygoteSocket = null; 457 458 throw new ZygoteStartFailedEx(ex); 459 } 460 461 return pid; 462 } 463 464 /** 465 * Starts a new process via the zygote mechanism. 466 * 467 * @param processClass Class name whose static main() to run 468 * @param niceName 'nice' process name to appear in ps 469 * @param uid a POSIX uid that the new process should setuid() to 470 * @param gid a POSIX gid that the new process shuold setgid() to 471 * @param gids null-ok; a list of supplementary group IDs that the 472 * new process should setgroup() to. 473 * @param enableDebugger True if debugging should be enabled for this process. 474 * @param extraArgs Additional arguments to supply to the zygote process. 475 * @return PID 476 * @throws ZygoteStartFailedEx if process start failed for any reason 477 */ 478 private static int startViaZygote(final String processClass, 479 final String niceName, 480 final int uid, final int gid, 481 final int[] gids, 482 int debugFlags, 483 String[] extraArgs) 484 throws ZygoteStartFailedEx { 485 int pid; 486 487 synchronized(Process.class) { 488 ArrayList<String> argsForZygote = new ArrayList<String>(); 489 490 // --runtime-init, --setuid=, --setgid=, 491 // and --setgroups= must go first 492 argsForZygote.add("--runtime-init"); 493 argsForZygote.add("--setuid=" + uid); 494 argsForZygote.add("--setgid=" + gid); 495 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 496 argsForZygote.add("--enable-debugger"); 497 } 498 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 499 argsForZygote.add("--enable-checkjni"); 500 } 501 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 502 argsForZygote.add("--enable-assert"); 503 } 504 505 //TODO optionally enable debuger 506 //argsForZygote.add("--enable-debugger"); 507 508 // --setgroups is a comma-separated list 509 if (gids != null && gids.length > 0) { 510 StringBuilder sb = new StringBuilder(); 511 sb.append("--setgroups="); 512 513 int sz = gids.length; 514 for (int i = 0; i < sz; i++) { 515 if (i != 0) { 516 sb.append(','); 517 } 518 sb.append(gids[i]); 519 } 520 521 argsForZygote.add(sb.toString()); 522 } 523 524 if (niceName != null) { 525 argsForZygote.add("--nice-name=" + niceName); 526 } 527 528 argsForZygote.add(processClass); 529 530 if (extraArgs != null) { 531 for (String arg : extraArgs) { 532 argsForZygote.add(arg); 533 } 534 } 535 536 pid = zygoteSendArgsAndGetPid(argsForZygote); 537 } 538 539 if (pid <= 0) { 540 throw new ZygoteStartFailedEx("zygote start failed:" + pid); 541 } 542 543 return pid; 544 } 545 546 /** 547 * Returns elapsed milliseconds of the time this process has run. 548 * @return Returns the number of milliseconds this process has return. 549 */ 550 public static final native long getElapsedCpuTime(); 551 552 /** 553 * Returns the identifier of this process, which can be used with 554 * {@link #killProcess} and {@link #sendSignal}. 555 */ 556 public static final native int myPid(); 557 558 /** 559 * Returns the identifier of the calling thread, which be used with 560 * {@link #setThreadPriority(int, int)}. 561 */ 562 public static final native int myTid(); 563 564 /** 565 * Returns the identifier of this process's user. 566 */ 567 public static final native int myUid(); 568 569 /** 570 * Returns the UID assigned to a particular user name, or -1 if there is 571 * none. If the given string consists of only numbers, it is converted 572 * directly to a uid. 573 */ 574 public static final native int getUidForName(String name); 575 576 /** 577 * Returns the GID assigned to a particular user name, or -1 if there is 578 * none. If the given string consists of only numbers, it is converted 579 * directly to a gid. 580 */ 581 public static final native int getGidForName(String name); 582 583 /** 584 * Returns a uid for a currently running process. 585 * @param pid the process id 586 * @return the uid of the process, or -1 if the process is not running. 587 * @hide pending API council review 588 */ 589 public static final int getUidForPid(int pid) { 590 String[] procStatusLabels = { "Uid:" }; 591 long[] procStatusValues = new long[1]; 592 procStatusValues[0] = -1; 593 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 594 return (int) procStatusValues[0]; 595 } 596 597 /** 598 * Set the priority of a thread, based on Linux priorities. 599 * 600 * @param tid The identifier of the thread/process to change. 601 * @param priority A Linux priority level, from -20 for highest scheduling 602 * priority to 19 for lowest scheduling priority. 603 * 604 * @throws IllegalArgumentException Throws IllegalArgumentException if 605 * <var>tid</var> does not exist. 606 * @throws SecurityException Throws SecurityException if your process does 607 * not have permission to modify the given thread, or to use the given 608 * priority. 609 */ 610 public static final native void setThreadPriority(int tid, int priority) 611 throws IllegalArgumentException, SecurityException; 612 613 /** 614 * Sets the scheduling group for a thread. 615 * @hide 616 * @param tid The indentifier of the thread/process to change. 617 * @param group The target group for this thread/process. 618 * 619 * @throws IllegalArgumentException Throws IllegalArgumentException if 620 * <var>tid</var> does not exist. 621 * @throws SecurityException Throws SecurityException if your process does 622 * not have permission to modify the given thread, or to use the given 623 * priority. 624 */ 625 public static final native void setThreadGroup(int tid, int group) 626 throws IllegalArgumentException, SecurityException; 627 /** 628 * Sets the scheduling group for a process and all child threads 629 * @hide 630 * @param pid The indentifier of the process to change. 631 * @param group The target group for this process. 632 * 633 * @throws IllegalArgumentException Throws IllegalArgumentException if 634 * <var>tid</var> does not exist. 635 * @throws SecurityException Throws SecurityException if your process does 636 * not have permission to modify the given thread, or to use the given 637 * priority. 638 */ 639 public static final native void setProcessGroup(int pid, int group) 640 throws IllegalArgumentException, SecurityException; 641 642 /** 643 * Set the priority of the calling thread, based on Linux priorities. See 644 * {@link #setThreadPriority(int, int)} for more information. 645 * 646 * @param priority A Linux priority level, from -20 for highest scheduling 647 * priority to 19 for lowest scheduling priority. 648 * 649 * @throws IllegalArgumentException Throws IllegalArgumentException if 650 * <var>tid</var> does not exist. 651 * @throws SecurityException Throws SecurityException if your process does 652 * not have permission to modify the given thread, or to use the given 653 * priority. 654 * 655 * @see #setThreadPriority(int, int) 656 */ 657 public static final native void setThreadPriority(int priority) 658 throws IllegalArgumentException, SecurityException; 659 660 /** 661 * Return the current priority of a thread, based on Linux priorities. 662 * 663 * @param tid The identifier of the thread/process to change. 664 * 665 * @return Returns the current priority, as a Linux priority level, 666 * from -20 for highest scheduling priority to 19 for lowest scheduling 667 * priority. 668 * 669 * @throws IllegalArgumentException Throws IllegalArgumentException if 670 * <var>tid</var> does not exist. 671 */ 672 public static final native int getThreadPriority(int tid) 673 throws IllegalArgumentException; 674 675 /** 676 * Determine whether the current environment supports multiple processes. 677 * 678 * @return Returns true if the system can run in multiple processes, else 679 * false if everything is running in a single process. 680 */ 681 public static final native boolean supportsProcesses(); 682 683 /** 684 * Set the out-of-memory badness adjustment for a process. 685 * 686 * @param pid The process identifier to set. 687 * @param amt Adjustment value -- linux allows -16 to +15. 688 * 689 * @return Returns true if the underlying system supports this 690 * feature, else false. 691 * 692 * {@hide} 693 */ 694 public static final native boolean setOomAdj(int pid, int amt); 695 696 /** 697 * Change this process's argv[0] parameter. This can be useful to show 698 * more descriptive information in things like the 'ps' command. 699 * 700 * @param text The new name of this process. 701 * 702 * {@hide} 703 */ 704 public static final native void setArgV0(String text); 705 706 /** 707 * Kill the process with the given PID. 708 * Note that, though this API allows us to request to 709 * kill any process based on its PID, the kernel will 710 * still impose standard restrictions on which PIDs you 711 * are actually able to kill. Typically this means only 712 * the process running the caller's packages/application 713 * and any additional processes created by that app; packages 714 * sharing a common UID will also be able to kill each 715 * other's processes. 716 */ 717 public static final void killProcess(int pid) { 718 sendSignal(pid, SIGNAL_KILL); 719 } 720 721 /** @hide */ 722 public static final native int setUid(int uid); 723 724 /** @hide */ 725 public static final native int setGid(int uid); 726 727 /** 728 * Send a signal to the given process. 729 * 730 * @param pid The pid of the target process. 731 * @param signal The signal to send. 732 */ 733 public static final native void sendSignal(int pid, int signal); 734 735 /** @hide */ 736 public static final native int getFreeMemory(); 737 738 /** @hide */ 739 public static final native void readProcLines(String path, 740 String[] reqFields, long[] outSizes); 741 742 /** @hide */ 743 public static final native int[] getPids(String path, int[] lastArray); 744 745 /** @hide */ 746 public static final int PROC_TERM_MASK = 0xff; 747 /** @hide */ 748 public static final int PROC_ZERO_TERM = 0; 749 /** @hide */ 750 public static final int PROC_SPACE_TERM = (int)' '; 751 /** @hide */ 752 public static final int PROC_TAB_TERM = (int)'\t'; 753 /** @hide */ 754 public static final int PROC_COMBINE = 0x100; 755 /** @hide */ 756 public static final int PROC_PARENS = 0x200; 757 /** @hide */ 758 public static final int PROC_OUT_STRING = 0x1000; 759 /** @hide */ 760 public static final int PROC_OUT_LONG = 0x2000; 761 /** @hide */ 762 public static final int PROC_OUT_FLOAT = 0x4000; 763 764 /** @hide */ 765 public static final native boolean readProcFile(String file, int[] format, 766 String[] outStrings, long[] outLongs, float[] outFloats); 767 768 /** @hide */ 769 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 770 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 771 772 /** 773 * Gets the total Pss value for a given process, in bytes. 774 * 775 * @param pid the process to the Pss for 776 * @return the total Pss value for the given process in bytes, 777 * or -1 if the value cannot be determined 778 * @hide 779 */ 780 public static final native long getPss(int pid); 781} 782