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 UID/GID for the mediaserver process. 90 * @hide 91 */ 92 public static final int MEDIA_UID = 1013; 93 94 /** 95 * Defines the UID/GID for the DRM process. 96 * @hide 97 */ 98 public static final int DRM_UID = 1019; 99 100 /** 101 * Defines the GID for the group that allows write access to the SD card. 102 * @hide 103 */ 104 public static final int SDCARD_RW_GID = 1015; 105 106 /** 107 * Defines the UID/GID for the group that controls VPN services. 108 * @hide 109 */ 110 public static final int VPN_UID = 1016; 111 112 /** 113 * Defines the UID/GID for the NFC service process. 114 * @hide 115 */ 116 public static final int NFC_UID = 1027; 117 118 /** 119 * Defines the UID/GID for the Bluetooth service process. 120 * @hide 121 */ 122 public static final int BLUETOOTH_UID = 1002; 123 124 /** 125 * Defines the GID for the group that allows write access to the internal media storage. 126 * @hide 127 */ 128 public static final int MEDIA_RW_GID = 1023; 129 130 /** 131 * Defines the start of a range of UIDs (and GIDs), going from this 132 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 133 * to applications. 134 */ 135 public static final int FIRST_APPLICATION_UID = 10000; 136 /** 137 * Last of application-specific UIDs starting at 138 * {@link #FIRST_APPLICATION_UID}. 139 */ 140 public static final int LAST_APPLICATION_UID = 19999; 141 142 /** 143 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 144 * @hide 145 */ 146 public static final int FIRST_ISOLATED_UID = 99000; 147 148 /** 149 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 150 * @hide 151 */ 152 public static final int LAST_ISOLATED_UID = 99999; 153 154 /** 155 * First gid for applications to share resources. Used when forward-locking 156 * is enabled but all UserHandles need to be able to read the resources. 157 * @hide 158 */ 159 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 160 161 /** 162 * Last gid for applications to share resources. Used when forward-locking 163 * is enabled but all UserHandles need to be able to read the resources. 164 * @hide 165 */ 166 public static final int LAST_SHARED_APPLICATION_GID = 59999; 167 168 /** 169 * Standard priority of application threads. 170 * Use with {@link #setThreadPriority(int)} and 171 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 172 * {@link java.lang.Thread} class. 173 */ 174 public static final int THREAD_PRIORITY_DEFAULT = 0; 175 176 /* 177 * *************************************** 178 * ** Keep in sync with utils/threads.h ** 179 * *************************************** 180 */ 181 182 /** 183 * Lowest available thread priority. Only for those who really, really 184 * don't want to run if anything else is happening. 185 * Use with {@link #setThreadPriority(int)} and 186 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 187 * {@link java.lang.Thread} class. 188 */ 189 public static final int THREAD_PRIORITY_LOWEST = 19; 190 191 /** 192 * Standard priority background threads. This gives your thread a slightly 193 * lower than normal priority, so that it will have less chance of impacting 194 * the responsiveness of the user interface. 195 * Use with {@link #setThreadPriority(int)} and 196 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 197 * {@link java.lang.Thread} class. 198 */ 199 public static final int THREAD_PRIORITY_BACKGROUND = 10; 200 201 /** 202 * Standard priority of threads that are currently running a user interface 203 * that the user is interacting with. Applications can not normally 204 * change to this priority; the system will automatically adjust your 205 * application threads as the user moves through the UI. 206 * Use with {@link #setThreadPriority(int)} and 207 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 208 * {@link java.lang.Thread} class. 209 */ 210 public static final int THREAD_PRIORITY_FOREGROUND = -2; 211 212 /** 213 * Standard priority of system display threads, involved in updating 214 * the user interface. Applications can not 215 * normally change to this priority. 216 * Use with {@link #setThreadPriority(int)} and 217 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 218 * {@link java.lang.Thread} class. 219 */ 220 public static final int THREAD_PRIORITY_DISPLAY = -4; 221 222 /** 223 * Standard priority of the most important display threads, for compositing 224 * the screen and retrieving input events. Applications can not normally 225 * change to this priority. 226 * Use with {@link #setThreadPriority(int)} and 227 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 228 * {@link java.lang.Thread} class. 229 */ 230 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 231 232 /** 233 * Standard priority of audio threads. Applications can not normally 234 * change to this priority. 235 * Use with {@link #setThreadPriority(int)} and 236 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 237 * {@link java.lang.Thread} class. 238 */ 239 public static final int THREAD_PRIORITY_AUDIO = -16; 240 241 /** 242 * Standard priority of the most important audio threads. 243 * Applications can not normally change to this priority. 244 * Use with {@link #setThreadPriority(int)} and 245 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 246 * {@link java.lang.Thread} class. 247 */ 248 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 249 250 /** 251 * Minimum increment to make a priority more favorable. 252 */ 253 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 254 255 /** 256 * Minimum increment to make a priority less favorable. 257 */ 258 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 259 260 /** 261 * Default scheduling policy 262 * @hide 263 */ 264 public static final int SCHED_OTHER = 0; 265 266 /** 267 * First-In First-Out scheduling policy 268 * @hide 269 */ 270 public static final int SCHED_FIFO = 1; 271 272 /** 273 * Round-Robin scheduling policy 274 * @hide 275 */ 276 public static final int SCHED_RR = 2; 277 278 /** 279 * Batch scheduling policy 280 * @hide 281 */ 282 public static final int SCHED_BATCH = 3; 283 284 /** 285 * Idle scheduling policy 286 * @hide 287 */ 288 public static final int SCHED_IDLE = 5; 289 290 // Keep in sync with SP_* constants of enum type SchedPolicy 291 // declared in system/core/include/cutils/sched_policy.h, 292 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 293 294 /** 295 * Default thread group - 296 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 297 * When used with setProcessGroup(), the group of each thread in the process 298 * is conditionally changed based on that thread's current priority, as follows: 299 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 300 * are moved to foreground thread group. All other threads are left unchanged. 301 * @hide 302 */ 303 public static final int THREAD_GROUP_DEFAULT = -1; 304 305 /** 306 * Background thread group - All threads in 307 * this group are scheduled with a reduced share of the CPU. 308 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 309 * FIXME rename to THREAD_GROUP_BACKGROUND. 310 * @hide 311 */ 312 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 313 314 /** 315 * Foreground thread group - All threads in 316 * this group are scheduled with a normal share of the CPU. 317 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 318 * Not used at this level. 319 * @hide 320 **/ 321 private static final int THREAD_GROUP_FOREGROUND = 1; 322 323 /** 324 * System thread group. 325 * @hide 326 **/ 327 public static final int THREAD_GROUP_SYSTEM = 2; 328 329 /** 330 * Application audio thread group. 331 * @hide 332 **/ 333 public static final int THREAD_GROUP_AUDIO_APP = 3; 334 335 /** 336 * System audio thread group. 337 * @hide 338 **/ 339 public static final int THREAD_GROUP_AUDIO_SYS = 4; 340 341 public static final int SIGNAL_QUIT = 3; 342 public static final int SIGNAL_KILL = 9; 343 public static final int SIGNAL_USR1 = 10; 344 345 // State for communicating with zygote process 346 347 static LocalSocket sZygoteSocket; 348 static DataInputStream sZygoteInputStream; 349 static BufferedWriter sZygoteWriter; 350 351 /** true if previous zygote open failed */ 352 static boolean sPreviousZygoteOpenFailed; 353 354 /** 355 * Start a new process. 356 * 357 * <p>If processes are enabled, a new process is created and the 358 * static main() function of a <var>processClass</var> is executed there. 359 * The process will continue running after this function returns. 360 * 361 * <p>If processes are not enabled, a new thread in the caller's 362 * process is created and main() of <var>processClass</var> called there. 363 * 364 * <p>The niceName parameter, if not an empty string, is a custom name to 365 * give to the process instead of using processClass. This allows you to 366 * make easily identifyable processes even if you are using the same base 367 * <var>processClass</var> to start them. 368 * 369 * @param processClass The class to use as the process's main entry 370 * point. 371 * @param niceName A more readable name to use for the process. 372 * @param uid The user-id under which the process will run. 373 * @param gid The group-id under which the process will run. 374 * @param gids Additional group-ids associated with the process. 375 * @param debugFlags Additional flags. 376 * @param targetSdkVersion The target SDK version for the app. 377 * @param seInfo null-ok SE Android information for the new process. 378 * @param zygoteArgs Additional arguments to supply to the zygote process. 379 * 380 * @return An object that describes the result of the attempt to start the process. 381 * @throws RuntimeException on fatal start failure 382 * 383 * {@hide} 384 */ start(final String processClass, final String niceName, int uid, int gid, int[] gids, int debugFlags, int mountExternal, int targetSdkVersion, String seInfo, String[] zygoteArgs)385 public static final ProcessStartResult start(final String processClass, 386 final String niceName, 387 int uid, int gid, int[] gids, 388 int debugFlags, int mountExternal, 389 int targetSdkVersion, 390 String seInfo, 391 String[] zygoteArgs) { 392 try { 393 return startViaZygote(processClass, niceName, uid, gid, gids, 394 debugFlags, mountExternal, targetSdkVersion, seInfo, zygoteArgs); 395 } catch (ZygoteStartFailedEx ex) { 396 Log.e(LOG_TAG, 397 "Starting VM process through Zygote failed"); 398 throw new RuntimeException( 399 "Starting VM process through Zygote failed", ex); 400 } 401 } 402 403 /** retry interval for opening a zygote socket */ 404 static final int ZYGOTE_RETRY_MILLIS = 500; 405 406 /** 407 * Tries to open socket to Zygote process if not already open. If 408 * already open, does nothing. May block and retry. 409 */ openZygoteSocketIfNeeded()410 private static void openZygoteSocketIfNeeded() 411 throws ZygoteStartFailedEx { 412 413 int retryCount; 414 415 if (sPreviousZygoteOpenFailed) { 416 /* 417 * If we've failed before, expect that we'll fail again and 418 * don't pause for retries. 419 */ 420 retryCount = 0; 421 } else { 422 retryCount = 10; 423 } 424 425 /* 426 * See bug #811181: Sometimes runtime can make it up before zygote. 427 * Really, we'd like to do something better to avoid this condition, 428 * but for now just wait a bit... 429 */ 430 for (int retry = 0 431 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 432 ; retry++ ) { 433 434 if (retry > 0) { 435 try { 436 Log.i("Zygote", "Zygote not up yet, sleeping..."); 437 Thread.sleep(ZYGOTE_RETRY_MILLIS); 438 } catch (InterruptedException ex) { 439 // should never happen 440 } 441 } 442 443 try { 444 sZygoteSocket = new LocalSocket(); 445 446 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 447 LocalSocketAddress.Namespace.RESERVED)); 448 449 sZygoteInputStream 450 = new DataInputStream(sZygoteSocket.getInputStream()); 451 452 sZygoteWriter = 453 new BufferedWriter( 454 new OutputStreamWriter( 455 sZygoteSocket.getOutputStream()), 456 256); 457 458 Log.i("Zygote", "Process: zygote socket opened"); 459 460 sPreviousZygoteOpenFailed = false; 461 break; 462 } catch (IOException ex) { 463 if (sZygoteSocket != null) { 464 try { 465 sZygoteSocket.close(); 466 } catch (IOException ex2) { 467 Log.e(LOG_TAG,"I/O exception on close after exception", 468 ex2); 469 } 470 } 471 472 sZygoteSocket = null; 473 } 474 } 475 476 if (sZygoteSocket == null) { 477 sPreviousZygoteOpenFailed = true; 478 throw new ZygoteStartFailedEx("connect failed"); 479 } 480 } 481 482 /** 483 * Sends an argument list to the zygote process, which starts a new child 484 * and returns the child's pid. Please note: the present implementation 485 * replaces newlines in the argument list with spaces. 486 * @param args argument list 487 * @return An object that describes the result of the attempt to start the process. 488 * @throws ZygoteStartFailedEx if process start failed for any reason 489 */ zygoteSendArgsAndGetResult(ArrayList<String> args)490 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 491 throws ZygoteStartFailedEx { 492 openZygoteSocketIfNeeded(); 493 494 try { 495 /** 496 * See com.android.internal.os.ZygoteInit.readArgumentList() 497 * Presently the wire format to the zygote process is: 498 * a) a count of arguments (argc, in essence) 499 * b) a number of newline-separated argument strings equal to count 500 * 501 * After the zygote process reads these it will write the pid of 502 * the child or -1 on failure, followed by boolean to 503 * indicate whether a wrapper process was used. 504 */ 505 506 sZygoteWriter.write(Integer.toString(args.size())); 507 sZygoteWriter.newLine(); 508 509 int sz = args.size(); 510 for (int i = 0; i < sz; i++) { 511 String arg = args.get(i); 512 if (arg.indexOf('\n') >= 0) { 513 throw new ZygoteStartFailedEx( 514 "embedded newlines not allowed"); 515 } 516 sZygoteWriter.write(arg); 517 sZygoteWriter.newLine(); 518 } 519 520 sZygoteWriter.flush(); 521 522 // Should there be a timeout on this? 523 ProcessStartResult result = new ProcessStartResult(); 524 result.pid = sZygoteInputStream.readInt(); 525 if (result.pid < 0) { 526 throw new ZygoteStartFailedEx("fork() failed"); 527 } 528 result.usingWrapper = sZygoteInputStream.readBoolean(); 529 return result; 530 } catch (IOException ex) { 531 try { 532 if (sZygoteSocket != null) { 533 sZygoteSocket.close(); 534 } 535 } catch (IOException ex2) { 536 // we're going to fail anyway 537 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 538 } 539 540 sZygoteSocket = null; 541 542 throw new ZygoteStartFailedEx(ex); 543 } 544 } 545 546 /** 547 * Starts a new process via the zygote mechanism. 548 * 549 * @param processClass Class name whose static main() to run 550 * @param niceName 'nice' process name to appear in ps 551 * @param uid a POSIX uid that the new process should setuid() to 552 * @param gid a POSIX gid that the new process shuold setgid() to 553 * @param gids null-ok; a list of supplementary group IDs that the 554 * new process should setgroup() to. 555 * @param debugFlags Additional flags. 556 * @param targetSdkVersion The target SDK version for the app. 557 * @param seInfo null-ok SE Android information for the new process. 558 * @param extraArgs Additional arguments to supply to the zygote process. 559 * @return An object that describes the result of the attempt to start the process. 560 * @throws ZygoteStartFailedEx if process start failed for any reason 561 */ startViaZygote(final String processClass, final String niceName, final int uid, final int gid, final int[] gids, int debugFlags, int mountExternal, int targetSdkVersion, String seInfo, String[] extraArgs)562 private static ProcessStartResult startViaZygote(final String processClass, 563 final String niceName, 564 final int uid, final int gid, 565 final int[] gids, 566 int debugFlags, int mountExternal, 567 int targetSdkVersion, 568 String seInfo, 569 String[] extraArgs) 570 throws ZygoteStartFailedEx { 571 synchronized(Process.class) { 572 ArrayList<String> argsForZygote = new ArrayList<String>(); 573 574 // --runtime-init, --setuid=, --setgid=, 575 // and --setgroups= must go first 576 argsForZygote.add("--runtime-init"); 577 argsForZygote.add("--setuid=" + uid); 578 argsForZygote.add("--setgid=" + gid); 579 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 580 argsForZygote.add("--enable-jni-logging"); 581 } 582 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 583 argsForZygote.add("--enable-safemode"); 584 } 585 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 586 argsForZygote.add("--enable-debugger"); 587 } 588 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 589 argsForZygote.add("--enable-checkjni"); 590 } 591 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 592 argsForZygote.add("--enable-assert"); 593 } 594 if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER) { 595 argsForZygote.add("--mount-external-multiuser"); 596 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER_ALL) { 597 argsForZygote.add("--mount-external-multiuser-all"); 598 } 599 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 600 601 //TODO optionally enable debuger 602 //argsForZygote.add("--enable-debugger"); 603 604 // --setgroups is a comma-separated list 605 if (gids != null && gids.length > 0) { 606 StringBuilder sb = new StringBuilder(); 607 sb.append("--setgroups="); 608 609 int sz = gids.length; 610 for (int i = 0; i < sz; i++) { 611 if (i != 0) { 612 sb.append(','); 613 } 614 sb.append(gids[i]); 615 } 616 617 argsForZygote.add(sb.toString()); 618 } 619 620 if (niceName != null) { 621 argsForZygote.add("--nice-name=" + niceName); 622 } 623 624 if (seInfo != null) { 625 argsForZygote.add("--seinfo=" + seInfo); 626 } 627 628 argsForZygote.add(processClass); 629 630 if (extraArgs != null) { 631 for (String arg : extraArgs) { 632 argsForZygote.add(arg); 633 } 634 } 635 636 return zygoteSendArgsAndGetResult(argsForZygote); 637 } 638 } 639 640 /** 641 * Returns elapsed milliseconds of the time this process has run. 642 * @return Returns the number of milliseconds this process has return. 643 */ getElapsedCpuTime()644 public static final native long getElapsedCpuTime(); 645 646 /** 647 * Returns the identifier of this process, which can be used with 648 * {@link #killProcess} and {@link #sendSignal}. 649 */ myPid()650 public static final native int myPid(); 651 652 /** 653 * Returns the identifier of the calling thread, which be used with 654 * {@link #setThreadPriority(int, int)}. 655 */ myTid()656 public static final native int myTid(); 657 658 /** 659 * Returns the identifier of this process's uid. This is the kernel uid 660 * that the process is running under, which is the identity of its 661 * app-specific sandbox. It is different from {@link #myUserHandle} in that 662 * a uid identifies a specific app sandbox in a specific user. 663 */ myUid()664 public static final native int myUid(); 665 666 /** 667 * Returns this process's user handle. This is the 668 * user the process is running under. It is distinct from 669 * {@link #myUid()} in that a particular user will have multiple 670 * distinct apps running under it each with their own uid. 671 */ myUserHandle()672 public static final UserHandle myUserHandle() { 673 return new UserHandle(UserHandle.getUserId(myUid())); 674 } 675 676 /** 677 * Returns whether the current process is in an isolated sandbox. 678 * @hide 679 */ isIsolated()680 public static final boolean isIsolated() { 681 int uid = UserHandle.getAppId(myUid()); 682 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 683 } 684 685 /** 686 * Returns the UID assigned to a particular user name, or -1 if there is 687 * none. If the given string consists of only numbers, it is converted 688 * directly to a uid. 689 */ getUidForName(String name)690 public static final native int getUidForName(String name); 691 692 /** 693 * Returns the GID assigned to a particular user name, or -1 if there is 694 * none. If the given string consists of only numbers, it is converted 695 * directly to a gid. 696 */ getGidForName(String name)697 public static final native int getGidForName(String name); 698 699 /** 700 * Returns a uid for a currently running process. 701 * @param pid the process id 702 * @return the uid of the process, or -1 if the process is not running. 703 * @hide pending API council review 704 */ getUidForPid(int pid)705 public static final int getUidForPid(int pid) { 706 String[] procStatusLabels = { "Uid:" }; 707 long[] procStatusValues = new long[1]; 708 procStatusValues[0] = -1; 709 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 710 return (int) procStatusValues[0]; 711 } 712 713 /** 714 * Returns the parent process id for a currently running process. 715 * @param pid the process id 716 * @return the parent process id of the process, or -1 if the process is not running. 717 * @hide 718 */ getParentPid(int pid)719 public static final int getParentPid(int pid) { 720 String[] procStatusLabels = { "PPid:" }; 721 long[] procStatusValues = new long[1]; 722 procStatusValues[0] = -1; 723 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 724 return (int) procStatusValues[0]; 725 } 726 727 /** 728 * Returns the thread group leader id for a currently running thread. 729 * @param tid the thread id 730 * @return the thread group leader id of the thread, or -1 if the thread is not running. 731 * This is same as what getpid(2) would return if called by tid. 732 * @hide 733 */ getThreadGroupLeader(int tid)734 public static final int getThreadGroupLeader(int tid) { 735 String[] procStatusLabels = { "Tgid:" }; 736 long[] procStatusValues = new long[1]; 737 procStatusValues[0] = -1; 738 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 739 return (int) procStatusValues[0]; 740 } 741 742 /** 743 * Set the priority of a thread, based on Linux priorities. 744 * 745 * @param tid The identifier of the thread/process to change. 746 * @param priority A Linux priority level, from -20 for highest scheduling 747 * priority to 19 for lowest scheduling priority. 748 * 749 * @throws IllegalArgumentException Throws IllegalArgumentException if 750 * <var>tid</var> does not exist. 751 * @throws SecurityException Throws SecurityException if your process does 752 * not have permission to modify the given thread, or to use the given 753 * priority. 754 */ setThreadPriority(int tid, int priority)755 public static final native void setThreadPriority(int tid, int priority) 756 throws IllegalArgumentException, SecurityException; 757 758 /** 759 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 760 * throw an exception if passed a background-level thread priority. This is only 761 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 762 * 763 * @hide 764 */ setCanSelfBackground(boolean backgroundOk)765 public static final native void setCanSelfBackground(boolean backgroundOk); 766 767 /** 768 * Sets the scheduling group for a thread. 769 * @hide 770 * @param tid The identifier of the thread to change. 771 * @param group The target group for this thread from THREAD_GROUP_*. 772 * 773 * @throws IllegalArgumentException Throws IllegalArgumentException if 774 * <var>tid</var> does not exist. 775 * @throws SecurityException Throws SecurityException if your process does 776 * not have permission to modify the given thread, or to use the given 777 * priority. 778 * If the thread is a thread group leader, that is it's gettid() == getpid(), 779 * then the other threads in the same thread group are _not_ affected. 780 */ setThreadGroup(int tid, int group)781 public static final native void setThreadGroup(int tid, int group) 782 throws IllegalArgumentException, SecurityException; 783 784 /** 785 * Sets the scheduling group for a process and all child threads 786 * @hide 787 * @param pid The identifier of the process to change. 788 * @param group The target group for this process from THREAD_GROUP_*. 789 * 790 * @throws IllegalArgumentException Throws IllegalArgumentException if 791 * <var>tid</var> does not exist. 792 * @throws SecurityException Throws SecurityException if your process does 793 * not have permission to modify the given thread, or to use the given 794 * priority. 795 * 796 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 797 * threads to the foreground scheduling group, but to leave background 798 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 799 * threads, regardless of priority, to the background scheduling group. 800 * group == THREAD_GROUP_FOREGROUND is not allowed. 801 */ setProcessGroup(int pid, int group)802 public static final native void setProcessGroup(int pid, int group) 803 throws IllegalArgumentException, SecurityException; 804 805 /** 806 * Return the scheduling group of requested process. 807 * 808 * @hide 809 */ getProcessGroup(int pid)810 public static final native int getProcessGroup(int pid) 811 throws IllegalArgumentException, SecurityException; 812 813 /** 814 * Set the priority of the calling thread, based on Linux priorities. See 815 * {@link #setThreadPriority(int, int)} for more information. 816 * 817 * @param priority A Linux priority level, from -20 for highest scheduling 818 * priority to 19 for lowest scheduling priority. 819 * 820 * @throws IllegalArgumentException Throws IllegalArgumentException if 821 * <var>tid</var> does not exist. 822 * @throws SecurityException Throws SecurityException if your process does 823 * not have permission to modify the given thread, or to use the given 824 * priority. 825 * 826 * @see #setThreadPriority(int, int) 827 */ setThreadPriority(int priority)828 public static final native void setThreadPriority(int priority) 829 throws IllegalArgumentException, SecurityException; 830 831 /** 832 * Return the current priority of a thread, based on Linux priorities. 833 * 834 * @param tid The identifier of the thread/process to change. 835 * 836 * @return Returns the current priority, as a Linux priority level, 837 * from -20 for highest scheduling priority to 19 for lowest scheduling 838 * priority. 839 * 840 * @throws IllegalArgumentException Throws IllegalArgumentException if 841 * <var>tid</var> does not exist. 842 */ getThreadPriority(int tid)843 public static final native int getThreadPriority(int tid) 844 throws IllegalArgumentException; 845 846 /** 847 * Set the scheduling policy and priority of a thread, based on Linux. 848 * 849 * @param tid The identifier of the thread/process to change. 850 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 851 * @param priority A Linux priority level in a range appropriate for the given policy. 852 * 853 * @throws IllegalArgumentException Throws IllegalArgumentException if 854 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 855 * @throws SecurityException Throws SecurityException if your process does 856 * not have permission to modify the given thread, or to use the given 857 * scheduling policy or priority. 858 * 859 * {@hide} 860 */ setThreadScheduler(int tid, int policy, int priority)861 public static final native void setThreadScheduler(int tid, int policy, int priority) 862 throws IllegalArgumentException; 863 864 /** 865 * Determine whether the current environment supports multiple processes. 866 * 867 * @return Returns true if the system can run in multiple processes, else 868 * false if everything is running in a single process. 869 * 870 * @deprecated This method always returns true. Do not use. 871 */ 872 @Deprecated supportsProcesses()873 public static final boolean supportsProcesses() { 874 return true; 875 } 876 877 /** 878 * Set the out-of-memory badness adjustment for a process. 879 * 880 * @param pid The process identifier to set. 881 * @param amt Adjustment value -- linux allows -16 to +15. 882 * 883 * @return Returns true if the underlying system supports this 884 * feature, else false. 885 * 886 * {@hide} 887 */ setOomAdj(int pid, int amt)888 public static final native boolean setOomAdj(int pid, int amt); 889 890 /** 891 * Change this process's argv[0] parameter. This can be useful to show 892 * more descriptive information in things like the 'ps' command. 893 * 894 * @param text The new name of this process. 895 * 896 * {@hide} 897 */ setArgV0(String text)898 public static final native void setArgV0(String text); 899 900 /** 901 * Kill the process with the given PID. 902 * Note that, though this API allows us to request to 903 * kill any process based on its PID, the kernel will 904 * still impose standard restrictions on which PIDs you 905 * are actually able to kill. Typically this means only 906 * the process running the caller's packages/application 907 * and any additional processes created by that app; packages 908 * sharing a common UID will also be able to kill each 909 * other's processes. 910 */ killProcess(int pid)911 public static final void killProcess(int pid) { 912 sendSignal(pid, SIGNAL_KILL); 913 } 914 915 /** @hide */ setUid(int uid)916 public static final native int setUid(int uid); 917 918 /** @hide */ setGid(int uid)919 public static final native int setGid(int uid); 920 921 /** 922 * Send a signal to the given process. 923 * 924 * @param pid The pid of the target process. 925 * @param signal The signal to send. 926 */ sendSignal(int pid, int signal)927 public static final native void sendSignal(int pid, int signal); 928 929 /** 930 * @hide 931 * Private impl for avoiding a log message... DO NOT USE without doing 932 * your own log, or the Android Illuminati will find you some night and 933 * beat you up. 934 */ killProcessQuiet(int pid)935 public static final void killProcessQuiet(int pid) { 936 sendSignalQuiet(pid, SIGNAL_KILL); 937 } 938 939 /** 940 * @hide 941 * Private impl for avoiding a log message... DO NOT USE without doing 942 * your own log, or the Android Illuminati will find you some night and 943 * beat you up. 944 */ sendSignalQuiet(int pid, int signal)945 public static final native void sendSignalQuiet(int pid, int signal); 946 947 /** @hide */ getFreeMemory()948 public static final native long getFreeMemory(); 949 950 /** @hide */ getTotalMemory()951 public static final native long getTotalMemory(); 952 953 /** @hide */ readProcLines(String path, String[] reqFields, long[] outSizes)954 public static final native void readProcLines(String path, 955 String[] reqFields, long[] outSizes); 956 957 /** @hide */ getPids(String path, int[] lastArray)958 public static final native int[] getPids(String path, int[] lastArray); 959 960 /** @hide */ 961 public static final int PROC_TERM_MASK = 0xff; 962 /** @hide */ 963 public static final int PROC_ZERO_TERM = 0; 964 /** @hide */ 965 public static final int PROC_SPACE_TERM = (int)' '; 966 /** @hide */ 967 public static final int PROC_TAB_TERM = (int)'\t'; 968 /** @hide */ 969 public static final int PROC_COMBINE = 0x100; 970 /** @hide */ 971 public static final int PROC_PARENS = 0x200; 972 /** @hide */ 973 public static final int PROC_OUT_STRING = 0x1000; 974 /** @hide */ 975 public static final int PROC_OUT_LONG = 0x2000; 976 /** @hide */ 977 public static final int PROC_OUT_FLOAT = 0x4000; 978 979 /** @hide */ readProcFile(String file, int[] format, String[] outStrings, long[] outLongs, float[] outFloats)980 public static final native boolean readProcFile(String file, int[] format, 981 String[] outStrings, long[] outLongs, float[] outFloats); 982 983 /** @hide */ parseProcLine(byte[] buffer, int startIndex, int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats)984 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 985 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 986 987 /** @hide */ getPidsForCommands(String[] cmds)988 public static final native int[] getPidsForCommands(String[] cmds); 989 990 /** 991 * Gets the total Pss value for a given process, in bytes. 992 * 993 * @param pid the process to the Pss for 994 * @return the total Pss value for the given process in bytes, 995 * or -1 if the value cannot be determined 996 * @hide 997 */ getPss(int pid)998 public static final native long getPss(int pid); 999 1000 /** 1001 * Specifies the outcome of having started a process. 1002 * @hide 1003 */ 1004 public static final class ProcessStartResult { 1005 /** 1006 * The PID of the newly started process. 1007 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1008 */ 1009 public int pid; 1010 1011 /** 1012 * True if the process was started with a wrapper attached. 1013 */ 1014 public boolean usingWrapper; 1015 } 1016 } 1017