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 17 package android.os; 18 19 import android.net.LocalSocketAddress; 20 import android.net.LocalSocket; 21 import android.util.Log; 22 import dalvik.system.Zygote; 23 24 import java.io.BufferedWriter; 25 import java.io.DataInputStream; 26 import java.io.IOException; 27 import java.io.OutputStreamWriter; 28 import java.util.ArrayList; 29 30 /*package*/ class ZygoteStartFailedEx extends Exception { 31 /** 32 * Something prevented the zygote process startup from happening normally 33 */ 34 ZygoteStartFailedEx()35 ZygoteStartFailedEx() {}; ZygoteStartFailedEx(String s)36 ZygoteStartFailedEx(String s) {super(s);} ZygoteStartFailedEx(Throwable cause)37 ZygoteStartFailedEx(Throwable cause) {super(cause);} 38 } 39 40 /** 41 * Tools for managing OS processes. 42 */ 43 public 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 start of a range of UIDs (and GIDs), going from this 90 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 91 * to applications. 92 */ 93 public static final int FIRST_APPLICATION_UID = 10000; 94 /** 95 * Last of application-specific UIDs starting at 96 * {@link #FIRST_APPLICATION_UID}. 97 */ 98 public static final int LAST_APPLICATION_UID = 99999; 99 100 /** 101 * Defines a secondary group id for access to the bluetooth hardware. 102 */ 103 public static final int BLUETOOTH_GID = 2000; 104 105 /** 106 * Standard priority of application threads. 107 * Use with {@link #setThreadPriority(int)} and 108 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 109 * {@link java.lang.Thread} class. 110 */ 111 public static final int THREAD_PRIORITY_DEFAULT = 0; 112 113 /* 114 * *************************************** 115 * ** Keep in sync with utils/threads.h ** 116 * *************************************** 117 */ 118 119 /** 120 * Lowest available thread priority. Only for those who really, really 121 * don't want to run if anything else is happening. 122 * Use with {@link #setThreadPriority(int)} and 123 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 124 * {@link java.lang.Thread} class. 125 */ 126 public static final int THREAD_PRIORITY_LOWEST = 19; 127 128 /** 129 * Standard priority background threads. This gives your thread a slightly 130 * lower than normal priority, so that it will have less chance of impacting 131 * the responsiveness of the user interface. 132 * Use with {@link #setThreadPriority(int)} and 133 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 134 * {@link java.lang.Thread} class. 135 */ 136 public static final int THREAD_PRIORITY_BACKGROUND = 10; 137 138 /** 139 * Standard priority of threads that are currently running a user interface 140 * that the user is interacting with. Applications can not normally 141 * change to this priority; the system will automatically adjust your 142 * application threads as the user moves through the UI. 143 * Use with {@link #setThreadPriority(int)} and 144 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 145 * {@link java.lang.Thread} class. 146 */ 147 public static final int THREAD_PRIORITY_FOREGROUND = -2; 148 149 /** 150 * Standard priority of system display threads, involved in updating 151 * the user interface. Applications can not 152 * normally change to this priority. 153 * Use with {@link #setThreadPriority(int)} and 154 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 155 * {@link java.lang.Thread} class. 156 */ 157 public static final int THREAD_PRIORITY_DISPLAY = -4; 158 159 /** 160 * Standard priority of the most important display threads, for compositing 161 * the screen and retrieving input events. Applications can not normally 162 * change to this priority. 163 * Use with {@link #setThreadPriority(int)} and 164 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 165 * {@link java.lang.Thread} class. 166 */ 167 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 168 169 /** 170 * Standard priority of audio threads. Applications can not normally 171 * change to this priority. 172 * Use with {@link #setThreadPriority(int)} and 173 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 174 * {@link java.lang.Thread} class. 175 */ 176 public static final int THREAD_PRIORITY_AUDIO = -16; 177 178 /** 179 * Standard priority of the most important audio threads. 180 * Applications can not normally 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_AUDIO = -19; 186 187 /** 188 * Minimum increment to make a priority more favorable. 189 */ 190 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 191 192 /** 193 * Minimum increment to make a priority less favorable. 194 */ 195 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 196 197 /** 198 * Default thread group - gets a 'normal' share of the CPU 199 * @hide 200 */ 201 public static final int THREAD_GROUP_DEFAULT = 0; 202 203 /** 204 * Background non-interactive thread group - All threads in 205 * this group are scheduled with a reduced share of the CPU. 206 * @hide 207 */ 208 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 1; 209 210 /** 211 * Foreground 'boost' thread group - All threads in 212 * this group are scheduled with an increased share of the CPU 213 * @hide 214 **/ 215 public static final int THREAD_GROUP_FG_BOOST = 2; 216 217 public static final int SIGNAL_QUIT = 3; 218 public static final int SIGNAL_KILL = 9; 219 public static final int SIGNAL_USR1 = 10; 220 221 // State for communicating with zygote process 222 223 static LocalSocket sZygoteSocket; 224 static DataInputStream sZygoteInputStream; 225 static BufferedWriter sZygoteWriter; 226 227 /** true if previous zygote open failed */ 228 static boolean sPreviousZygoteOpenFailed; 229 230 /** 231 * Start a new process. 232 * 233 * <p>If processes are enabled, a new process is created and the 234 * static main() function of a <var>processClass</var> is executed there. 235 * The process will continue running after this function returns. 236 * 237 * <p>If processes are not enabled, a new thread in the caller's 238 * process is created and main() of <var>processClass</var> called there. 239 * 240 * <p>The niceName parameter, if not an empty string, is a custom name to 241 * give to the process instead of using processClass. This allows you to 242 * make easily identifyable processes even if you are using the same base 243 * <var>processClass</var> to start them. 244 * 245 * @param processClass The class to use as the process's main entry 246 * point. 247 * @param niceName A more readable name to use for the process. 248 * @param uid The user-id under which the process will run. 249 * @param gid The group-id under which the process will run. 250 * @param gids Additional group-ids associated with the process. 251 * @param enableDebugger True if debugging should be enabled for this process. 252 * @param zygoteArgs Additional arguments to supply to the zygote process. 253 * 254 * @return int If > 0 the pid of the new process; if 0 the process is 255 * being emulated by a thread 256 * @throws RuntimeException on fatal start failure 257 * 258 * {@hide} 259 */ start(final String processClass, final String niceName, int uid, int gid, int[] gids, int debugFlags, String[] zygoteArgs)260 public static final int start(final String processClass, 261 final String niceName, 262 int uid, int gid, int[] gids, 263 int debugFlags, 264 String[] zygoteArgs) 265 { 266 if (supportsProcesses()) { 267 try { 268 return startViaZygote(processClass, niceName, uid, gid, gids, 269 debugFlags, zygoteArgs); 270 } catch (ZygoteStartFailedEx ex) { 271 Log.e(LOG_TAG, 272 "Starting VM process through Zygote failed"); 273 throw new RuntimeException( 274 "Starting VM process through Zygote failed", ex); 275 } 276 } else { 277 // Running in single-process mode 278 279 Runnable runnable = new Runnable() { 280 public void run() { 281 Process.invokeStaticMain(processClass); 282 } 283 }; 284 285 // Thread constructors must not be called with null names (see spec). 286 if (niceName != null) { 287 new Thread(runnable, niceName).start(); 288 } else { 289 new Thread(runnable).start(); 290 } 291 292 return 0; 293 } 294 } 295 296 /** 297 * Start a new process. Don't supply a custom nice name. 298 * {@hide} 299 */ start(String processClass, int uid, int gid, int[] gids, int debugFlags, String[] zygoteArgs)300 public static final int start(String processClass, int uid, int gid, 301 int[] gids, int debugFlags, String[] zygoteArgs) { 302 return start(processClass, "", uid, gid, gids, 303 debugFlags, zygoteArgs); 304 } 305 invokeStaticMain(String className)306 private static void invokeStaticMain(String className) { 307 Class cl; 308 Object args[] = new Object[1]; 309 310 args[0] = new String[0]; //this is argv 311 312 try { 313 cl = Class.forName(className); 314 cl.getMethod("main", new Class[] { String[].class }) 315 .invoke(null, args); 316 } catch (Exception ex) { 317 // can be: ClassNotFoundException, 318 // NoSuchMethodException, SecurityException, 319 // IllegalAccessException, IllegalArgumentException 320 // InvocationTargetException 321 // or uncaught exception from main() 322 323 Log.e(LOG_TAG, "Exception invoking static main on " 324 + className, ex); 325 326 throw new RuntimeException(ex); 327 } 328 329 } 330 331 /** retry interval for opening a zygote socket */ 332 static final int ZYGOTE_RETRY_MILLIS = 500; 333 334 /** 335 * Tries to open socket to Zygote process if not already open. If 336 * already open, does nothing. May block and retry. 337 */ openZygoteSocketIfNeeded()338 private static void openZygoteSocketIfNeeded() 339 throws ZygoteStartFailedEx { 340 341 int retryCount; 342 343 if (sPreviousZygoteOpenFailed) { 344 /* 345 * If we've failed before, expect that we'll fail again and 346 * don't pause for retries. 347 */ 348 retryCount = 0; 349 } else { 350 retryCount = 10; 351 } 352 353 /* 354 * See bug #811181: Sometimes runtime can make it up before zygote. 355 * Really, we'd like to do something better to avoid this condition, 356 * but for now just wait a bit... 357 */ 358 for (int retry = 0 359 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 360 ; retry++ ) { 361 362 if (retry > 0) { 363 try { 364 Log.i("Zygote", "Zygote not up yet, sleeping..."); 365 Thread.sleep(ZYGOTE_RETRY_MILLIS); 366 } catch (InterruptedException ex) { 367 // should never happen 368 } 369 } 370 371 try { 372 sZygoteSocket = new LocalSocket(); 373 374 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 375 LocalSocketAddress.Namespace.RESERVED)); 376 377 sZygoteInputStream 378 = new DataInputStream(sZygoteSocket.getInputStream()); 379 380 sZygoteWriter = 381 new BufferedWriter( 382 new OutputStreamWriter( 383 sZygoteSocket.getOutputStream()), 384 256); 385 386 Log.i("Zygote", "Process: zygote socket opened"); 387 388 sPreviousZygoteOpenFailed = false; 389 break; 390 } catch (IOException ex) { 391 if (sZygoteSocket != null) { 392 try { 393 sZygoteSocket.close(); 394 } catch (IOException ex2) { 395 Log.e(LOG_TAG,"I/O exception on close after exception", 396 ex2); 397 } 398 } 399 400 sZygoteSocket = null; 401 } 402 } 403 404 if (sZygoteSocket == null) { 405 sPreviousZygoteOpenFailed = true; 406 throw new ZygoteStartFailedEx("connect failed"); 407 } 408 } 409 410 /** 411 * Sends an argument list to the zygote process, which starts a new child 412 * and returns the child's pid. Please note: the present implementation 413 * replaces newlines in the argument list with spaces. 414 * @param args argument list 415 * @return PID of new child process 416 * @throws ZygoteStartFailedEx if process start failed for any reason 417 */ zygoteSendArgsAndGetPid(ArrayList<String> args)418 private static int zygoteSendArgsAndGetPid(ArrayList<String> args) 419 throws ZygoteStartFailedEx { 420 421 int pid; 422 423 openZygoteSocketIfNeeded(); 424 425 try { 426 /** 427 * See com.android.internal.os.ZygoteInit.readArgumentList() 428 * Presently the wire format to the zygote process is: 429 * a) a count of arguments (argc, in essence) 430 * b) a number of newline-separated argument strings equal to count 431 * 432 * After the zygote process reads these it will write the pid of 433 * the child or -1 on failure. 434 */ 435 436 sZygoteWriter.write(Integer.toString(args.size())); 437 sZygoteWriter.newLine(); 438 439 int sz = args.size(); 440 for (int i = 0; i < sz; i++) { 441 String arg = args.get(i); 442 if (arg.indexOf('\n') >= 0) { 443 throw new ZygoteStartFailedEx( 444 "embedded newlines not allowed"); 445 } 446 sZygoteWriter.write(arg); 447 sZygoteWriter.newLine(); 448 } 449 450 sZygoteWriter.flush(); 451 452 // Should there be a timeout on this? 453 pid = sZygoteInputStream.readInt(); 454 455 if (pid < 0) { 456 throw new ZygoteStartFailedEx("fork() failed"); 457 } 458 } catch (IOException ex) { 459 try { 460 if (sZygoteSocket != null) { 461 sZygoteSocket.close(); 462 } 463 } catch (IOException ex2) { 464 // we're going to fail anyway 465 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 466 } 467 468 sZygoteSocket = null; 469 470 throw new ZygoteStartFailedEx(ex); 471 } 472 473 return pid; 474 } 475 476 /** 477 * Starts a new process via the zygote mechanism. 478 * 479 * @param processClass Class name whose static main() to run 480 * @param niceName 'nice' process name to appear in ps 481 * @param uid a POSIX uid that the new process should setuid() to 482 * @param gid a POSIX gid that the new process shuold setgid() to 483 * @param gids null-ok; a list of supplementary group IDs that the 484 * new process should setgroup() to. 485 * @param enableDebugger True if debugging should be enabled for this process. 486 * @param extraArgs Additional arguments to supply to the zygote process. 487 * @return PID 488 * @throws ZygoteStartFailedEx if process start failed for any reason 489 */ startViaZygote(final String processClass, final String niceName, final int uid, final int gid, final int[] gids, int debugFlags, String[] extraArgs)490 private static int startViaZygote(final String processClass, 491 final String niceName, 492 final int uid, final int gid, 493 final int[] gids, 494 int debugFlags, 495 String[] extraArgs) 496 throws ZygoteStartFailedEx { 497 int pid; 498 499 synchronized(Process.class) { 500 ArrayList<String> argsForZygote = new ArrayList<String>(); 501 502 // --runtime-init, --setuid=, --setgid=, 503 // and --setgroups= must go first 504 argsForZygote.add("--runtime-init"); 505 argsForZygote.add("--setuid=" + uid); 506 argsForZygote.add("--setgid=" + gid); 507 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 508 argsForZygote.add("--enable-debugger"); 509 } 510 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 511 argsForZygote.add("--enable-checkjni"); 512 } 513 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 514 argsForZygote.add("--enable-assert"); 515 } 516 517 //TODO optionally enable debuger 518 //argsForZygote.add("--enable-debugger"); 519 520 // --setgroups is a comma-separated list 521 if (gids != null && gids.length > 0) { 522 StringBuilder sb = new StringBuilder(); 523 sb.append("--setgroups="); 524 525 int sz = gids.length; 526 for (int i = 0; i < sz; i++) { 527 if (i != 0) { 528 sb.append(','); 529 } 530 sb.append(gids[i]); 531 } 532 533 argsForZygote.add(sb.toString()); 534 } 535 536 if (niceName != null) { 537 argsForZygote.add("--nice-name=" + niceName); 538 } 539 540 argsForZygote.add(processClass); 541 542 if (extraArgs != null) { 543 for (String arg : extraArgs) { 544 argsForZygote.add(arg); 545 } 546 } 547 548 pid = zygoteSendArgsAndGetPid(argsForZygote); 549 } 550 551 if (pid <= 0) { 552 throw new ZygoteStartFailedEx("zygote start failed:" + pid); 553 } 554 555 return pid; 556 } 557 558 /** 559 * Returns elapsed milliseconds of the time this process has run. 560 * @return Returns the number of milliseconds this process has return. 561 */ getElapsedCpuTime()562 public static final native long getElapsedCpuTime(); 563 564 /** 565 * Returns the identifier of this process, which can be used with 566 * {@link #killProcess} and {@link #sendSignal}. 567 */ myPid()568 public static final native int myPid(); 569 570 /** 571 * Returns the identifier of the calling thread, which be used with 572 * {@link #setThreadPriority(int, int)}. 573 */ myTid()574 public static final native int myTid(); 575 576 /** 577 * Returns the identifier of this process's user. 578 */ myUid()579 public static final native int myUid(); 580 581 /** 582 * Returns the UID assigned to a particular user name, or -1 if there is 583 * none. If the given string consists of only numbers, it is converted 584 * directly to a uid. 585 */ getUidForName(String name)586 public static final native int getUidForName(String name); 587 588 /** 589 * Returns the GID assigned to a particular user name, or -1 if there is 590 * none. If the given string consists of only numbers, it is converted 591 * directly to a gid. 592 */ getGidForName(String name)593 public static final native int getGidForName(String name); 594 595 /** 596 * Returns a uid for a currently running process. 597 * @param pid the process id 598 * @return the uid of the process, or -1 if the process is not running. 599 * @hide pending API council review 600 */ getUidForPid(int pid)601 public static final int getUidForPid(int pid) { 602 String[] procStatusLabels = { "Uid:" }; 603 long[] procStatusValues = new long[1]; 604 procStatusValues[0] = -1; 605 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 606 return (int) procStatusValues[0]; 607 } 608 609 /** 610 * Set the priority of a thread, based on Linux priorities. 611 * 612 * @param tid The identifier of the thread/process to change. 613 * @param priority A Linux priority level, from -20 for highest scheduling 614 * priority to 19 for lowest scheduling priority. 615 * 616 * @throws IllegalArgumentException Throws IllegalArgumentException if 617 * <var>tid</var> does not exist. 618 * @throws SecurityException Throws SecurityException if your process does 619 * not have permission to modify the given thread, or to use the given 620 * priority. 621 */ setThreadPriority(int tid, int priority)622 public static final native void setThreadPriority(int tid, int priority) 623 throws IllegalArgumentException, SecurityException; 624 625 /** 626 * Sets the scheduling group for a thread. 627 * @hide 628 * @param tid The indentifier of the thread/process to change. 629 * @param group The target group for this thread/process. 630 * 631 * @throws IllegalArgumentException Throws IllegalArgumentException if 632 * <var>tid</var> does not exist. 633 * @throws SecurityException Throws SecurityException if your process does 634 * not have permission to modify the given thread, or to use the given 635 * priority. 636 */ setThreadGroup(int tid, int group)637 public static final native void setThreadGroup(int tid, int group) 638 throws IllegalArgumentException, SecurityException; 639 /** 640 * Sets the scheduling group for a process and all child threads 641 * @hide 642 * @param pid The indentifier of the process to change. 643 * @param group The target group for this process. 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 */ setProcessGroup(int pid, int group)651 public static final native void setProcessGroup(int pid, int group) 652 throws IllegalArgumentException, SecurityException; 653 654 /** 655 * Set the priority of the calling thread, based on Linux priorities. See 656 * {@link #setThreadPriority(int, int)} for more information. 657 * 658 * @param priority A Linux priority level, from -20 for highest scheduling 659 * priority to 19 for lowest scheduling priority. 660 * 661 * @throws IllegalArgumentException Throws IllegalArgumentException if 662 * <var>tid</var> does not exist. 663 * @throws SecurityException Throws SecurityException if your process does 664 * not have permission to modify the given thread, or to use the given 665 * priority. 666 * 667 * @see #setThreadPriority(int, int) 668 */ setThreadPriority(int priority)669 public static final native void setThreadPriority(int priority) 670 throws IllegalArgumentException, SecurityException; 671 672 /** 673 * Return the current priority of a thread, based on Linux priorities. 674 * 675 * @param tid The identifier of the thread/process to change. 676 * 677 * @return Returns the current priority, as a Linux priority level, 678 * from -20 for highest scheduling priority to 19 for lowest scheduling 679 * priority. 680 * 681 * @throws IllegalArgumentException Throws IllegalArgumentException if 682 * <var>tid</var> does not exist. 683 */ getThreadPriority(int tid)684 public static final native int getThreadPriority(int tid) 685 throws IllegalArgumentException; 686 687 /** 688 * Determine whether the current environment supports multiple processes. 689 * 690 * @return Returns true if the system can run in multiple processes, else 691 * false if everything is running in a single process. 692 */ supportsProcesses()693 public static final native boolean supportsProcesses(); 694 695 /** 696 * Set the out-of-memory badness adjustment for a process. 697 * 698 * @param pid The process identifier to set. 699 * @param amt Adjustment value -- linux allows -16 to +15. 700 * 701 * @return Returns true if the underlying system supports this 702 * feature, else false. 703 * 704 * {@hide} 705 */ setOomAdj(int pid, int amt)706 public static final native boolean setOomAdj(int pid, int amt); 707 708 /** 709 * Change this process's argv[0] parameter. This can be useful to show 710 * more descriptive information in things like the 'ps' command. 711 * 712 * @param text The new name of this process. 713 * 714 * {@hide} 715 */ setArgV0(String text)716 public static final native void setArgV0(String text); 717 718 /** 719 * Kill the process with the given PID. 720 * Note that, though this API allows us to request to 721 * kill any process based on its PID, the kernel will 722 * still impose standard restrictions on which PIDs you 723 * are actually able to kill. Typically this means only 724 * the process running the caller's packages/application 725 * and any additional processes created by that app; packages 726 * sharing a common UID will also be able to kill each 727 * other's processes. 728 */ killProcess(int pid)729 public static final void killProcess(int pid) { 730 sendSignal(pid, SIGNAL_KILL); 731 } 732 733 /** @hide */ setUid(int uid)734 public static final native int setUid(int uid); 735 736 /** @hide */ setGid(int uid)737 public static final native int setGid(int uid); 738 739 /** 740 * Send a signal to the given process. 741 * 742 * @param pid The pid of the target process. 743 * @param signal The signal to send. 744 */ sendSignal(int pid, int signal)745 public static final native void sendSignal(int pid, int signal); 746 747 /** @hide */ getFreeMemory()748 public static final native long getFreeMemory(); 749 750 /** @hide */ readProcLines(String path, String[] reqFields, long[] outSizes)751 public static final native void readProcLines(String path, 752 String[] reqFields, long[] outSizes); 753 754 /** @hide */ getPids(String path, int[] lastArray)755 public static final native int[] getPids(String path, int[] lastArray); 756 757 /** @hide */ 758 public static final int PROC_TERM_MASK = 0xff; 759 /** @hide */ 760 public static final int PROC_ZERO_TERM = 0; 761 /** @hide */ 762 public static final int PROC_SPACE_TERM = (int)' '; 763 /** @hide */ 764 public static final int PROC_TAB_TERM = (int)'\t'; 765 /** @hide */ 766 public static final int PROC_COMBINE = 0x100; 767 /** @hide */ 768 public static final int PROC_PARENS = 0x200; 769 /** @hide */ 770 public static final int PROC_OUT_STRING = 0x1000; 771 /** @hide */ 772 public static final int PROC_OUT_LONG = 0x2000; 773 /** @hide */ 774 public static final int PROC_OUT_FLOAT = 0x4000; 775 776 /** @hide */ readProcFile(String file, int[] format, String[] outStrings, long[] outLongs, float[] outFloats)777 public static final native boolean readProcFile(String file, int[] format, 778 String[] outStrings, long[] outLongs, float[] outFloats); 779 780 /** @hide */ parseProcLine(byte[] buffer, int startIndex, int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats)781 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 782 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 783 784 /** 785 * Gets the total Pss value for a given process, in bytes. 786 * 787 * @param pid the process to the Pss for 788 * @return the total Pss value for the given process in bytes, 789 * or -1 if the value cannot be determined 790 * @hide 791 */ getPss(int pid)792 public static final native long getPss(int pid); 793 } 794