Process.java revision 854060af30f928c0a65591e9c8314ae17056e6b8
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 WIFI supplicant process. 78 * @hide 79 */ 80 public static final int WIFI_UID = 1010; 81 82 /** 83 * Defines the start of a range of UIDs (and GIDs), going from this 84 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 85 * to applications. 86 */ 87 public static final int FIRST_APPLICATION_UID = 10000; 88 /** 89 * Last of application-specific UIDs starting at 90 * {@link #FIRST_APPLICATION_UID}. 91 */ 92 public static final int LAST_APPLICATION_UID = 99999; 93 94 /** 95 * Defines a secondary group id for access to the bluetooth hardware. 96 */ 97 public static final int BLUETOOTH_GID = 2000; 98 99 /** 100 * Standard priority of application threads. 101 * Use with {@link #setThreadPriority(int)} and 102 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 103 * {@link java.lang.Thread} class. 104 */ 105 public static final int THREAD_PRIORITY_DEFAULT = 0; 106 107 /* 108 * *************************************** 109 * ** Keep in sync with utils/threads.h ** 110 * *************************************** 111 */ 112 113 /** 114 * Lowest available thread priority. Only for those who really, really 115 * don't want to run if anything else is happening. 116 * Use with {@link #setThreadPriority(int)} and 117 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 118 * {@link java.lang.Thread} class. 119 */ 120 public static final int THREAD_PRIORITY_LOWEST = 19; 121 122 /** 123 * Standard priority background threads. This gives your thread a slightly 124 * lower than normal priority, so that it will have less chance of impacting 125 * the responsiveness of the user interface. 126 * Use with {@link #setThreadPriority(int)} and 127 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 128 * {@link java.lang.Thread} class. 129 */ 130 public static final int THREAD_PRIORITY_BACKGROUND = 10; 131 132 /** 133 * Standard priority of threads that are currently running a user interface 134 * that the user is interacting with. Applications can not normally 135 * change to this priority; the system will automatically adjust your 136 * application threads as the user moves through the UI. 137 * Use with {@link #setThreadPriority(int)} and 138 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 139 * {@link java.lang.Thread} class. 140 */ 141 public static final int THREAD_PRIORITY_FOREGROUND = -2; 142 143 /** 144 * Standard priority of system display threads, involved in updating 145 * the user interface. Applications can not 146 * normally change to this priority. 147 * Use with {@link #setThreadPriority(int)} and 148 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 149 * {@link java.lang.Thread} class. 150 */ 151 public static final int THREAD_PRIORITY_DISPLAY = -4; 152 153 /** 154 * Standard priority of the most important display threads, for compositing 155 * the screen and retrieving input events. Applications can not normally 156 * change to this priority. 157 * Use with {@link #setThreadPriority(int)} and 158 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 159 * {@link java.lang.Thread} class. 160 */ 161 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 162 163 /** 164 * Standard priority of audio threads. Applications can not normally 165 * change to this priority. 166 * Use with {@link #setThreadPriority(int)} and 167 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 168 * {@link java.lang.Thread} class. 169 */ 170 public static final int THREAD_PRIORITY_AUDIO = -16; 171 172 /** 173 * Standard priority of the most important audio threads. 174 * Applications can not normally change to this priority. 175 * Use with {@link #setThreadPriority(int)} and 176 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 177 * {@link java.lang.Thread} class. 178 */ 179 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 180 181 /** 182 * Minimum increment to make a priority more favorable. 183 */ 184 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 185 186 /** 187 * Minimum increment to make a priority less favorable. 188 */ 189 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 190 191 /** 192 * Default thread group - gets a 'normal' share of the CPU 193 * @hide 194 */ 195 public static final int THREAD_GROUP_DEFAULT = 0; 196 197 /** 198 * Background non-interactive thread group - All threads in 199 * this group are scheduled with a reduced share of the CPU. 200 * @hide 201 */ 202 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 1; 203 204 /** 205 * Foreground 'boost' thread group - All threads in 206 * this group are scheduled with an increased share of the CPU 207 * @hide 208 **/ 209 public static final int THREAD_GROUP_FG_BOOST = 2; 210 211 public static final int SIGNAL_QUIT = 3; 212 public static final int SIGNAL_KILL = 9; 213 public static final int SIGNAL_USR1 = 10; 214 215 // State for communicating with zygote process 216 217 static LocalSocket sZygoteSocket; 218 static DataInputStream sZygoteInputStream; 219 static BufferedWriter sZygoteWriter; 220 221 /** true if previous zygote open failed */ 222 static boolean sPreviousZygoteOpenFailed; 223 224 /** 225 * Start a new process. 226 * 227 * <p>If processes are enabled, a new process is created and the 228 * static main() function of a <var>processClass</var> is executed there. 229 * The process will continue running after this function returns. 230 * 231 * <p>If processes are not enabled, a new thread in the caller's 232 * process is created and main() of <var>processClass</var> called there. 233 * 234 * <p>The niceName parameter, if not an empty string, is a custom name to 235 * give to the process instead of using processClass. This allows you to 236 * make easily identifyable processes even if you are using the same base 237 * <var>processClass</var> to start them. 238 * 239 * @param processClass The class to use as the process's main entry 240 * point. 241 * @param niceName A more readable name to use for the process. 242 * @param uid The user-id under which the process will run. 243 * @param gid The group-id under which the process will run. 244 * @param gids Additional group-ids associated with the process. 245 * @param enableDebugger True if debugging should be enabled for this process. 246 * @param zygoteArgs Additional arguments to supply to the zygote process. 247 * 248 * @return int If > 0 the pid of the new process; if 0 the process is 249 * being emulated by a thread 250 * @throws RuntimeException on fatal start failure 251 * 252 * {@hide} 253 */ 254 public static final int start(final String processClass, 255 final String niceName, 256 int uid, int gid, int[] gids, 257 int debugFlags, 258 String[] zygoteArgs) 259 { 260 if (supportsProcesses()) { 261 try { 262 return startViaZygote(processClass, niceName, uid, gid, gids, 263 debugFlags, zygoteArgs); 264 } catch (ZygoteStartFailedEx ex) { 265 Log.e(LOG_TAG, 266 "Starting VM process through Zygote failed"); 267 throw new RuntimeException( 268 "Starting VM process through Zygote failed", ex); 269 } 270 } else { 271 // Running in single-process mode 272 273 Runnable runnable = new Runnable() { 274 public void run() { 275 Process.invokeStaticMain(processClass); 276 } 277 }; 278 279 // Thread constructors must not be called with null names (see spec). 280 if (niceName != null) { 281 new Thread(runnable, niceName).start(); 282 } else { 283 new Thread(runnable).start(); 284 } 285 286 return 0; 287 } 288 } 289 290 /** 291 * Start a new process. Don't supply a custom nice name. 292 * {@hide} 293 */ 294 public static final int start(String processClass, int uid, int gid, 295 int[] gids, int debugFlags, String[] zygoteArgs) { 296 return start(processClass, "", uid, gid, gids, 297 debugFlags, zygoteArgs); 298 } 299 300 private static void invokeStaticMain(String className) { 301 Class cl; 302 Object args[] = new Object[1]; 303 304 args[0] = new String[0]; //this is argv 305 306 try { 307 cl = Class.forName(className); 308 cl.getMethod("main", new Class[] { String[].class }) 309 .invoke(null, args); 310 } catch (Exception ex) { 311 // can be: ClassNotFoundException, 312 // NoSuchMethodException, SecurityException, 313 // IllegalAccessException, IllegalArgumentException 314 // InvocationTargetException 315 // or uncaught exception from main() 316 317 Log.e(LOG_TAG, "Exception invoking static main on " 318 + className, ex); 319 320 throw new RuntimeException(ex); 321 } 322 323 } 324 325 /** retry interval for opening a zygote socket */ 326 static final int ZYGOTE_RETRY_MILLIS = 500; 327 328 /** 329 * Tries to open socket to Zygote process if not already open. If 330 * already open, does nothing. May block and retry. 331 */ 332 private static void openZygoteSocketIfNeeded() 333 throws ZygoteStartFailedEx { 334 335 int retryCount; 336 337 if (sPreviousZygoteOpenFailed) { 338 /* 339 * If we've failed before, expect that we'll fail again and 340 * don't pause for retries. 341 */ 342 retryCount = 0; 343 } else { 344 retryCount = 10; 345 } 346 347 /* 348 * See bug #811181: Sometimes runtime can make it up before zygote. 349 * Really, we'd like to do something better to avoid this condition, 350 * but for now just wait a bit... 351 */ 352 for (int retry = 0 353 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 354 ; retry++ ) { 355 356 if (retry > 0) { 357 try { 358 Log.i("Zygote", "Zygote not up yet, sleeping..."); 359 Thread.sleep(ZYGOTE_RETRY_MILLIS); 360 } catch (InterruptedException ex) { 361 // should never happen 362 } 363 } 364 365 try { 366 sZygoteSocket = new LocalSocket(); 367 368 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 369 LocalSocketAddress.Namespace.RESERVED)); 370 371 sZygoteInputStream 372 = new DataInputStream(sZygoteSocket.getInputStream()); 373 374 sZygoteWriter = 375 new BufferedWriter( 376 new OutputStreamWriter( 377 sZygoteSocket.getOutputStream()), 378 256); 379 380 Log.i("Zygote", "Process: zygote socket opened"); 381 382 sPreviousZygoteOpenFailed = false; 383 break; 384 } catch (IOException ex) { 385 if (sZygoteSocket != null) { 386 try { 387 sZygoteSocket.close(); 388 } catch (IOException ex2) { 389 Log.e(LOG_TAG,"I/O exception on close after exception", 390 ex2); 391 } 392 } 393 394 sZygoteSocket = null; 395 } 396 } 397 398 if (sZygoteSocket == null) { 399 sPreviousZygoteOpenFailed = true; 400 throw new ZygoteStartFailedEx("connect failed"); 401 } 402 } 403 404 /** 405 * Sends an argument list to the zygote process, which starts a new child 406 * and returns the child's pid. Please note: the present implementation 407 * replaces newlines in the argument list with spaces. 408 * @param args argument list 409 * @return PID of new child process 410 * @throws ZygoteStartFailedEx if process start failed for any reason 411 */ 412 private static int zygoteSendArgsAndGetPid(ArrayList<String> args) 413 throws ZygoteStartFailedEx { 414 415 int pid; 416 417 openZygoteSocketIfNeeded(); 418 419 try { 420 /** 421 * See com.android.internal.os.ZygoteInit.readArgumentList() 422 * Presently the wire format to the zygote process is: 423 * a) a count of arguments (argc, in essence) 424 * b) a number of newline-separated argument strings equal to count 425 * 426 * After the zygote process reads these it will write the pid of 427 * the child or -1 on failure. 428 */ 429 430 sZygoteWriter.write(Integer.toString(args.size())); 431 sZygoteWriter.newLine(); 432 433 int sz = args.size(); 434 for (int i = 0; i < sz; i++) { 435 String arg = args.get(i); 436 if (arg.indexOf('\n') >= 0) { 437 throw new ZygoteStartFailedEx( 438 "embedded newlines not allowed"); 439 } 440 sZygoteWriter.write(arg); 441 sZygoteWriter.newLine(); 442 } 443 444 sZygoteWriter.flush(); 445 446 // Should there be a timeout on this? 447 pid = sZygoteInputStream.readInt(); 448 449 if (pid < 0) { 450 throw new ZygoteStartFailedEx("fork() failed"); 451 } 452 } catch (IOException ex) { 453 try { 454 if (sZygoteSocket != null) { 455 sZygoteSocket.close(); 456 } 457 } catch (IOException ex2) { 458 // we're going to fail anyway 459 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 460 } 461 462 sZygoteSocket = null; 463 464 throw new ZygoteStartFailedEx(ex); 465 } 466 467 return pid; 468 } 469 470 /** 471 * Starts a new process via the zygote mechanism. 472 * 473 * @param processClass Class name whose static main() to run 474 * @param niceName 'nice' process name to appear in ps 475 * @param uid a POSIX uid that the new process should setuid() to 476 * @param gid a POSIX gid that the new process shuold setgid() to 477 * @param gids null-ok; a list of supplementary group IDs that the 478 * new process should setgroup() to. 479 * @param enableDebugger True if debugging should be enabled for this process. 480 * @param extraArgs Additional arguments to supply to the zygote process. 481 * @return PID 482 * @throws ZygoteStartFailedEx if process start failed for any reason 483 */ 484 private static int startViaZygote(final String processClass, 485 final String niceName, 486 final int uid, final int gid, 487 final int[] gids, 488 int debugFlags, 489 String[] extraArgs) 490 throws ZygoteStartFailedEx { 491 int pid; 492 493 synchronized(Process.class) { 494 ArrayList<String> argsForZygote = new ArrayList<String>(); 495 496 // --runtime-init, --setuid=, --setgid=, 497 // and --setgroups= must go first 498 argsForZygote.add("--runtime-init"); 499 argsForZygote.add("--setuid=" + uid); 500 argsForZygote.add("--setgid=" + gid); 501 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 502 argsForZygote.add("--enable-debugger"); 503 } 504 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 505 argsForZygote.add("--enable-checkjni"); 506 } 507 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 508 argsForZygote.add("--enable-assert"); 509 } 510 511 //TODO optionally enable debuger 512 //argsForZygote.add("--enable-debugger"); 513 514 // --setgroups is a comma-separated list 515 if (gids != null && gids.length > 0) { 516 StringBuilder sb = new StringBuilder(); 517 sb.append("--setgroups="); 518 519 int sz = gids.length; 520 for (int i = 0; i < sz; i++) { 521 if (i != 0) { 522 sb.append(','); 523 } 524 sb.append(gids[i]); 525 } 526 527 argsForZygote.add(sb.toString()); 528 } 529 530 if (niceName != null) { 531 argsForZygote.add("--nice-name=" + niceName); 532 } 533 534 argsForZygote.add(processClass); 535 536 if (extraArgs != null) { 537 for (String arg : extraArgs) { 538 argsForZygote.add(arg); 539 } 540 } 541 542 pid = zygoteSendArgsAndGetPid(argsForZygote); 543 } 544 545 if (pid <= 0) { 546 throw new ZygoteStartFailedEx("zygote start failed:" + pid); 547 } 548 549 return pid; 550 } 551 552 /** 553 * Returns elapsed milliseconds of the time this process has run. 554 * @return Returns the number of milliseconds this process has return. 555 */ 556 public static final native long getElapsedCpuTime(); 557 558 /** 559 * Returns the identifier of this process, which can be used with 560 * {@link #killProcess} and {@link #sendSignal}. 561 */ 562 public static final native int myPid(); 563 564 /** 565 * Returns the identifier of the calling thread, which be used with 566 * {@link #setThreadPriority(int, int)}. 567 */ 568 public static final native int myTid(); 569 570 /** 571 * Returns the identifier of this process's user. 572 */ 573 public static final native int myUid(); 574 575 /** 576 * Returns the UID assigned to a particular user name, or -1 if there is 577 * none. If the given string consists of only numbers, it is converted 578 * directly to a uid. 579 */ 580 public static final native int getUidForName(String name); 581 582 /** 583 * Returns the GID assigned to a particular user name, or -1 if there is 584 * none. If the given string consists of only numbers, it is converted 585 * directly to a gid. 586 */ 587 public static final native int getGidForName(String name); 588 589 /** 590 * Returns a uid for a currently running process. 591 * @param pid the process id 592 * @return the uid of the process, or -1 if the process is not running. 593 * @hide pending API council review 594 */ 595 public static final int getUidForPid(int pid) { 596 String[] procStatusLabels = { "Uid:" }; 597 long[] procStatusValues = new long[1]; 598 procStatusValues[0] = -1; 599 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 600 return (int) procStatusValues[0]; 601 } 602 603 /** 604 * Set the priority of a thread, based on Linux priorities. 605 * 606 * @param tid The identifier of the thread/process to change. 607 * @param priority A Linux priority level, from -20 for highest scheduling 608 * priority to 19 for lowest scheduling priority. 609 * 610 * @throws IllegalArgumentException Throws IllegalArgumentException if 611 * <var>tid</var> does not exist. 612 * @throws SecurityException Throws SecurityException if your process does 613 * not have permission to modify the given thread, or to use the given 614 * priority. 615 */ 616 public static final native void setThreadPriority(int tid, int priority) 617 throws IllegalArgumentException, SecurityException; 618 619 /** 620 * Sets the scheduling group for a thread. 621 * @hide 622 * @param tid The indentifier of the thread/process to change. 623 * @param group The target group for this thread/process. 624 * 625 * @throws IllegalArgumentException Throws IllegalArgumentException if 626 * <var>tid</var> does not exist. 627 * @throws SecurityException Throws SecurityException if your process does 628 * not have permission to modify the given thread, or to use the given 629 * priority. 630 */ 631 public static final native void setThreadGroup(int tid, int group) 632 throws IllegalArgumentException, SecurityException; 633 /** 634 * Sets the scheduling group for a process and all child threads 635 * @hide 636 * @param pid The indentifier of the process to change. 637 * @param group The target group for this process. 638 * 639 * @throws IllegalArgumentException Throws IllegalArgumentException if 640 * <var>tid</var> does not exist. 641 * @throws SecurityException Throws SecurityException if your process does 642 * not have permission to modify the given thread, or to use the given 643 * priority. 644 */ 645 public static final native void setProcessGroup(int pid, int group) 646 throws IllegalArgumentException, SecurityException; 647 648 /** 649 * Set the priority of the calling thread, based on Linux priorities. See 650 * {@link #setThreadPriority(int, int)} for more information. 651 * 652 * @param priority A Linux priority level, from -20 for highest scheduling 653 * priority to 19 for lowest scheduling priority. 654 * 655 * @throws IllegalArgumentException Throws IllegalArgumentException if 656 * <var>tid</var> does not exist. 657 * @throws SecurityException Throws SecurityException if your process does 658 * not have permission to modify the given thread, or to use the given 659 * priority. 660 * 661 * @see #setThreadPriority(int, int) 662 */ 663 public static final native void setThreadPriority(int priority) 664 throws IllegalArgumentException, SecurityException; 665 666 /** 667 * Return the current priority of a thread, based on Linux priorities. 668 * 669 * @param tid The identifier of the thread/process to change. 670 * 671 * @return Returns the current priority, as a Linux priority level, 672 * from -20 for highest scheduling priority to 19 for lowest scheduling 673 * priority. 674 * 675 * @throws IllegalArgumentException Throws IllegalArgumentException if 676 * <var>tid</var> does not exist. 677 */ 678 public static final native int getThreadPriority(int tid) 679 throws IllegalArgumentException; 680 681 /** 682 * Determine whether the current environment supports multiple processes. 683 * 684 * @return Returns true if the system can run in multiple processes, else 685 * false if everything is running in a single process. 686 */ 687 public static final native boolean supportsProcesses(); 688 689 /** 690 * Set the out-of-memory badness adjustment for a process. 691 * 692 * @param pid The process identifier to set. 693 * @param amt Adjustment value -- linux allows -16 to +15. 694 * 695 * @return Returns true if the underlying system supports this 696 * feature, else false. 697 * 698 * {@hide} 699 */ 700 public static final native boolean setOomAdj(int pid, int amt); 701 702 /** 703 * Change this process's argv[0] parameter. This can be useful to show 704 * more descriptive information in things like the 'ps' command. 705 * 706 * @param text The new name of this process. 707 * 708 * {@hide} 709 */ 710 public static final native void setArgV0(String text); 711 712 /** 713 * Kill the process with the given PID. 714 * Note that, though this API allows us to request to 715 * kill any process based on its PID, the kernel will 716 * still impose standard restrictions on which PIDs you 717 * are actually able to kill. Typically this means only 718 * the process running the caller's packages/application 719 * and any additional processes created by that app; packages 720 * sharing a common UID will also be able to kill each 721 * other's processes. 722 */ 723 public static final void killProcess(int pid) { 724 sendSignal(pid, SIGNAL_KILL); 725 } 726 727 /** @hide */ 728 public static final native int setUid(int uid); 729 730 /** @hide */ 731 public static final native int setGid(int uid); 732 733 /** 734 * Send a signal to the given process. 735 * 736 * @param pid The pid of the target process. 737 * @param signal The signal to send. 738 */ 739 public static final native void sendSignal(int pid, int signal); 740 741 /** @hide */ 742 public static final native int getFreeMemory(); 743 744 /** @hide */ 745 public static final native void readProcLines(String path, 746 String[] reqFields, long[] outSizes); 747 748 /** @hide */ 749 public static final native int[] getPids(String path, int[] lastArray); 750 751 /** @hide */ 752 public static final int PROC_TERM_MASK = 0xff; 753 /** @hide */ 754 public static final int PROC_ZERO_TERM = 0; 755 /** @hide */ 756 public static final int PROC_SPACE_TERM = (int)' '; 757 /** @hide */ 758 public static final int PROC_TAB_TERM = (int)'\t'; 759 /** @hide */ 760 public static final int PROC_COMBINE = 0x100; 761 /** @hide */ 762 public static final int PROC_PARENS = 0x200; 763 /** @hide */ 764 public static final int PROC_OUT_STRING = 0x1000; 765 /** @hide */ 766 public static final int PROC_OUT_LONG = 0x2000; 767 /** @hide */ 768 public static final int PROC_OUT_FLOAT = 0x4000; 769 770 /** @hide */ 771 public static final native boolean readProcFile(String file, int[] format, 772 String[] outStrings, long[] outLongs, float[] outFloats); 773 774 /** @hide */ 775 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 776 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 777 778 /** 779 * Gets the total Pss value for a given process, in bytes. 780 * 781 * @param pid the process to the Pss for 782 * @return the total Pss value for the given process in bytes, 783 * or -1 if the value cannot be determined 784 * @hide 785 */ 786 public static final native long getPss(int pid); 787} 788