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 import libcore.io.Libcore; 31 32 /*package*/ class ZygoteStartFailedEx extends Exception { 33 /** 34 * Something prevented the zygote process startup from happening normally 35 */ 36 37 ZygoteStartFailedEx() {}; 38 ZygoteStartFailedEx(String s) {super(s);} 39 ZygoteStartFailedEx(Throwable cause) {super(cause);} 40 } 41 42 /** 43 * Tools for managing OS processes. 44 */ 45 public class Process { 46 private static final String LOG_TAG = "Process"; 47 48 private static final String ZYGOTE_SOCKET = "zygote"; 49 50 /** 51 * Name of a process for running the platform's media services. 52 * {@hide} 53 */ 54 public static final String ANDROID_SHARED_MEDIA = "com.android.process.media"; 55 56 /** 57 * Name of the process that Google content providers can share. 58 * {@hide} 59 */ 60 public static final String GOOGLE_SHARED_APP_CONTENT = "com.google.process.content"; 61 62 /** 63 * Defines the UID/GID under which system code runs. 64 */ 65 public static final int SYSTEM_UID = 1000; 66 67 /** 68 * Defines the UID/GID under which the telephony code runs. 69 */ 70 public static final int PHONE_UID = 1001; 71 72 /** 73 * Defines the UID/GID for the user shell. 74 * @hide 75 */ 76 public static final int SHELL_UID = 2000; 77 78 /** 79 * Defines the UID/GID for the log group. 80 * @hide 81 */ 82 public static final int LOG_UID = 1007; 83 84 /** 85 * Defines the UID/GID for the WIFI supplicant process. 86 * @hide 87 */ 88 public static final int WIFI_UID = 1010; 89 90 /** 91 * Defines the UID/GID for the mediaserver process. 92 * @hide 93 */ 94 public static final int MEDIA_UID = 1013; 95 96 /** 97 * Defines the UID/GID for the DRM process. 98 * @hide 99 */ 100 public static final int DRM_UID = 1019; 101 102 /** 103 * Defines the UID/GID for the group that controls VPN services. 104 * @hide 105 */ 106 public static final int VPN_UID = 1016; 107 108 /** 109 * Defines the UID/GID for the NFC service process. 110 * @hide 111 */ 112 public static final int NFC_UID = 1027; 113 114 /** 115 * Defines the UID/GID for the Bluetooth service process. 116 * @hide 117 */ 118 public static final int BLUETOOTH_UID = 1002; 119 120 /** 121 * Defines the GID for the group that allows write access to the internal media storage. 122 * @hide 123 */ 124 public static final int MEDIA_RW_GID = 1023; 125 126 /** 127 * Access to installed package details 128 * @hide 129 */ 130 public static final int PACKAGE_INFO_GID = 1032; 131 132 /** 133 * Defines the start of a range of UIDs (and GIDs), going from this 134 * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning 135 * to applications. 136 */ 137 public static final int FIRST_APPLICATION_UID = 10000; 138 139 /** 140 * Last of application-specific UIDs starting at 141 * {@link #FIRST_APPLICATION_UID}. 142 */ 143 public static final int LAST_APPLICATION_UID = 19999; 144 145 /** 146 * First uid used for fully isolated sandboxed processes (with no permissions of their own) 147 * @hide 148 */ 149 public static final int FIRST_ISOLATED_UID = 99000; 150 151 /** 152 * Last uid used for fully isolated sandboxed processes (with no permissions of their own) 153 * @hide 154 */ 155 public static final int LAST_ISOLATED_UID = 99999; 156 157 /** 158 * First gid for applications to share resources. Used when forward-locking 159 * is enabled but all UserHandles need to be able to read the resources. 160 * @hide 161 */ 162 public static final int FIRST_SHARED_APPLICATION_GID = 50000; 163 164 /** 165 * Last gid for applications to share resources. Used when forward-locking 166 * is enabled but all UserHandles need to be able to read the resources. 167 * @hide 168 */ 169 public static final int LAST_SHARED_APPLICATION_GID = 59999; 170 171 /** 172 * Standard priority of application threads. 173 * Use with {@link #setThreadPriority(int)} and 174 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 175 * {@link java.lang.Thread} class. 176 */ 177 public static final int THREAD_PRIORITY_DEFAULT = 0; 178 179 /* 180 * *************************************** 181 * ** Keep in sync with utils/threads.h ** 182 * *************************************** 183 */ 184 185 /** 186 * Lowest available thread priority. Only for those who really, really 187 * don't want to run if anything else is happening. 188 * Use with {@link #setThreadPriority(int)} and 189 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 190 * {@link java.lang.Thread} class. 191 */ 192 public static final int THREAD_PRIORITY_LOWEST = 19; 193 194 /** 195 * Standard priority background threads. This gives your thread a slightly 196 * lower than normal priority, so that it will have less chance of impacting 197 * the responsiveness of the user interface. 198 * Use with {@link #setThreadPriority(int)} and 199 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 200 * {@link java.lang.Thread} class. 201 */ 202 public static final int THREAD_PRIORITY_BACKGROUND = 10; 203 204 /** 205 * Standard priority of threads that are currently running a user interface 206 * that the user is interacting with. Applications can not normally 207 * change to this priority; the system will automatically adjust your 208 * application threads as the user moves through the UI. 209 * Use with {@link #setThreadPriority(int)} and 210 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 211 * {@link java.lang.Thread} class. 212 */ 213 public static final int THREAD_PRIORITY_FOREGROUND = -2; 214 215 /** 216 * Standard priority of system display threads, involved in updating 217 * the user interface. Applications can not 218 * normally change to this priority. 219 * Use with {@link #setThreadPriority(int)} and 220 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 221 * {@link java.lang.Thread} class. 222 */ 223 public static final int THREAD_PRIORITY_DISPLAY = -4; 224 225 /** 226 * Standard priority of the most important display threads, for compositing 227 * the screen and retrieving input events. Applications can not normally 228 * change to this priority. 229 * Use with {@link #setThreadPriority(int)} and 230 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 231 * {@link java.lang.Thread} class. 232 */ 233 public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; 234 235 /** 236 * Standard priority of audio threads. Applications can not normally 237 * change to this priority. 238 * Use with {@link #setThreadPriority(int)} and 239 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 240 * {@link java.lang.Thread} class. 241 */ 242 public static final int THREAD_PRIORITY_AUDIO = -16; 243 244 /** 245 * Standard priority of the most important audio threads. 246 * Applications can not normally change to this priority. 247 * Use with {@link #setThreadPriority(int)} and 248 * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal 249 * {@link java.lang.Thread} class. 250 */ 251 public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; 252 253 /** 254 * Minimum increment to make a priority more favorable. 255 */ 256 public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; 257 258 /** 259 * Minimum increment to make a priority less favorable. 260 */ 261 public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; 262 263 /** 264 * Default scheduling policy 265 * @hide 266 */ 267 public static final int SCHED_OTHER = 0; 268 269 /** 270 * First-In First-Out scheduling policy 271 * @hide 272 */ 273 public static final int SCHED_FIFO = 1; 274 275 /** 276 * Round-Robin scheduling policy 277 * @hide 278 */ 279 public static final int SCHED_RR = 2; 280 281 /** 282 * Batch scheduling policy 283 * @hide 284 */ 285 public static final int SCHED_BATCH = 3; 286 287 /** 288 * Idle scheduling policy 289 * @hide 290 */ 291 public static final int SCHED_IDLE = 5; 292 293 // Keep in sync with SP_* constants of enum type SchedPolicy 294 // declared in system/core/include/cutils/sched_policy.h, 295 // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. 296 297 /** 298 * Default thread group - 299 * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). 300 * When used with setProcessGroup(), the group of each thread in the process 301 * is conditionally changed based on that thread's current priority, as follows: 302 * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND 303 * are moved to foreground thread group. All other threads are left unchanged. 304 * @hide 305 */ 306 public static final int THREAD_GROUP_DEFAULT = -1; 307 308 /** 309 * Background thread group - All threads in 310 * this group are scheduled with a reduced share of the CPU. 311 * Value is same as constant SP_BACKGROUND of enum SchedPolicy. 312 * FIXME rename to THREAD_GROUP_BACKGROUND. 313 * @hide 314 */ 315 public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; 316 317 /** 318 * Foreground thread group - All threads in 319 * this group are scheduled with a normal share of the CPU. 320 * Value is same as constant SP_FOREGROUND of enum SchedPolicy. 321 * Not used at this level. 322 * @hide 323 **/ 324 private static final int THREAD_GROUP_FOREGROUND = 1; 325 326 /** 327 * System thread group. 328 * @hide 329 **/ 330 public static final int THREAD_GROUP_SYSTEM = 2; 331 332 /** 333 * Application audio thread group. 334 * @hide 335 **/ 336 public static final int THREAD_GROUP_AUDIO_APP = 3; 337 338 /** 339 * System audio thread group. 340 * @hide 341 **/ 342 public static final int THREAD_GROUP_AUDIO_SYS = 4; 343 344 public static final int SIGNAL_QUIT = 3; 345 public static final int SIGNAL_KILL = 9; 346 public static final int SIGNAL_USR1 = 10; 347 348 // State for communicating with zygote process 349 350 static LocalSocket sZygoteSocket; 351 static DataInputStream sZygoteInputStream; 352 static BufferedWriter sZygoteWriter; 353 354 /** true if previous zygote open failed */ 355 static boolean sPreviousZygoteOpenFailed; 356 357 /** 358 * Start a new process. 359 * 360 * <p>If processes are enabled, a new process is created and the 361 * static main() function of a <var>processClass</var> is executed there. 362 * The process will continue running after this function returns. 363 * 364 * <p>If processes are not enabled, a new thread in the caller's 365 * process is created and main() of <var>processClass</var> called there. 366 * 367 * <p>The niceName parameter, if not an empty string, is a custom name to 368 * give to the process instead of using processClass. This allows you to 369 * make easily identifyable processes even if you are using the same base 370 * <var>processClass</var> to start them. 371 * 372 * @param processClass The class to use as the process's main entry 373 * point. 374 * @param niceName A more readable name to use for the process. 375 * @param uid The user-id under which the process will run. 376 * @param gid The group-id under which the process will run. 377 * @param gids Additional group-ids associated with the process. 378 * @param debugFlags Additional flags. 379 * @param targetSdkVersion The target SDK version for the app. 380 * @param seInfo null-ok SE Android information for the new process. 381 * @param zygoteArgs Additional arguments to supply to the zygote process. 382 * 383 * @return An object that describes the result of the attempt to start the process. 384 * @throws RuntimeException on fatal start failure 385 * 386 * {@hide} 387 */ 388 public static final ProcessStartResult start(final String processClass, 389 final String niceName, 390 int uid, int gid, int[] gids, 391 int debugFlags, int mountExternal, 392 int targetSdkVersion, 393 String seInfo, 394 String[] zygoteArgs) { 395 try { 396 return startViaZygote(processClass, niceName, uid, gid, gids, 397 debugFlags, mountExternal, targetSdkVersion, seInfo, zygoteArgs); 398 } catch (ZygoteStartFailedEx ex) { 399 Log.e(LOG_TAG, 400 "Starting VM process through Zygote failed"); 401 throw new RuntimeException( 402 "Starting VM process through Zygote failed", ex); 403 } 404 } 405 406 /** retry interval for opening a zygote socket */ 407 static final int ZYGOTE_RETRY_MILLIS = 500; 408 409 /** 410 * Tries to open socket to Zygote process if not already open. If 411 * already open, does nothing. May block and retry. 412 */ 413 private static void openZygoteSocketIfNeeded() 414 throws ZygoteStartFailedEx { 415 416 int retryCount; 417 418 if (sPreviousZygoteOpenFailed) { 419 /* 420 * If we've failed before, expect that we'll fail again and 421 * don't pause for retries. 422 */ 423 retryCount = 0; 424 } else { 425 retryCount = 10; 426 } 427 428 /* 429 * See bug #811181: Sometimes runtime can make it up before zygote. 430 * Really, we'd like to do something better to avoid this condition, 431 * but for now just wait a bit... 432 */ 433 for (int retry = 0 434 ; (sZygoteSocket == null) && (retry < (retryCount + 1)) 435 ; retry++ ) { 436 437 if (retry > 0) { 438 try { 439 Log.i("Zygote", "Zygote not up yet, sleeping..."); 440 Thread.sleep(ZYGOTE_RETRY_MILLIS); 441 } catch (InterruptedException ex) { 442 // should never happen 443 } 444 } 445 446 try { 447 sZygoteSocket = new LocalSocket(); 448 449 sZygoteSocket.connect(new LocalSocketAddress(ZYGOTE_SOCKET, 450 LocalSocketAddress.Namespace.RESERVED)); 451 452 sZygoteInputStream 453 = new DataInputStream(sZygoteSocket.getInputStream()); 454 455 sZygoteWriter = 456 new BufferedWriter( 457 new OutputStreamWriter( 458 sZygoteSocket.getOutputStream()), 459 256); 460 461 Log.i("Zygote", "Process: zygote socket opened"); 462 463 sPreviousZygoteOpenFailed = false; 464 break; 465 } catch (IOException ex) { 466 if (sZygoteSocket != null) { 467 try { 468 sZygoteSocket.close(); 469 } catch (IOException ex2) { 470 Log.e(LOG_TAG,"I/O exception on close after exception", 471 ex2); 472 } 473 } 474 475 sZygoteSocket = null; 476 } 477 } 478 479 if (sZygoteSocket == null) { 480 sPreviousZygoteOpenFailed = true; 481 throw new ZygoteStartFailedEx("connect failed"); 482 } 483 } 484 485 /** 486 * Sends an argument list to the zygote process, which starts a new child 487 * and returns the child's pid. Please note: the present implementation 488 * replaces newlines in the argument list with spaces. 489 * @param args argument list 490 * @return An object that describes the result of the attempt to start the process. 491 * @throws ZygoteStartFailedEx if process start failed for any reason 492 */ 493 private static ProcessStartResult zygoteSendArgsAndGetResult(ArrayList<String> args) 494 throws ZygoteStartFailedEx { 495 openZygoteSocketIfNeeded(); 496 497 try { 498 /** 499 * See com.android.internal.os.ZygoteInit.readArgumentList() 500 * Presently the wire format to the zygote process is: 501 * a) a count of arguments (argc, in essence) 502 * b) a number of newline-separated argument strings equal to count 503 * 504 * After the zygote process reads these it will write the pid of 505 * the child or -1 on failure, followed by boolean to 506 * indicate whether a wrapper process was used. 507 */ 508 509 sZygoteWriter.write(Integer.toString(args.size())); 510 sZygoteWriter.newLine(); 511 512 int sz = args.size(); 513 for (int i = 0; i < sz; i++) { 514 String arg = args.get(i); 515 if (arg.indexOf('\n') >= 0) { 516 throw new ZygoteStartFailedEx( 517 "embedded newlines not allowed"); 518 } 519 sZygoteWriter.write(arg); 520 sZygoteWriter.newLine(); 521 } 522 523 sZygoteWriter.flush(); 524 525 // Should there be a timeout on this? 526 ProcessStartResult result = new ProcessStartResult(); 527 result.pid = sZygoteInputStream.readInt(); 528 if (result.pid < 0) { 529 throw new ZygoteStartFailedEx("fork() failed"); 530 } 531 result.usingWrapper = sZygoteInputStream.readBoolean(); 532 return result; 533 } catch (IOException ex) { 534 try { 535 if (sZygoteSocket != null) { 536 sZygoteSocket.close(); 537 } 538 } catch (IOException ex2) { 539 // we're going to fail anyway 540 Log.e(LOG_TAG,"I/O exception on routine close", ex2); 541 } 542 543 sZygoteSocket = null; 544 545 throw new ZygoteStartFailedEx(ex); 546 } 547 } 548 549 /** 550 * Starts a new process via the zygote mechanism. 551 * 552 * @param processClass Class name whose static main() to run 553 * @param niceName 'nice' process name to appear in ps 554 * @param uid a POSIX uid that the new process should setuid() to 555 * @param gid a POSIX gid that the new process shuold setgid() to 556 * @param gids null-ok; a list of supplementary group IDs that the 557 * new process should setgroup() to. 558 * @param debugFlags Additional flags. 559 * @param targetSdkVersion The target SDK version for the app. 560 * @param seInfo null-ok SE Android information for the new process. 561 * @param extraArgs Additional arguments to supply to the zygote process. 562 * @return An object that describes the result of the attempt to start the process. 563 * @throws ZygoteStartFailedEx if process start failed for any reason 564 */ 565 private static ProcessStartResult startViaZygote(final String processClass, 566 final String niceName, 567 final int uid, final int gid, 568 final int[] gids, 569 int debugFlags, int mountExternal, 570 int targetSdkVersion, 571 String seInfo, 572 String[] extraArgs) 573 throws ZygoteStartFailedEx { 574 synchronized(Process.class) { 575 ArrayList<String> argsForZygote = new ArrayList<String>(); 576 577 // --runtime-init, --setuid=, --setgid=, 578 // and --setgroups= must go first 579 argsForZygote.add("--runtime-init"); 580 argsForZygote.add("--setuid=" + uid); 581 argsForZygote.add("--setgid=" + gid); 582 if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { 583 argsForZygote.add("--enable-jni-logging"); 584 } 585 if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { 586 argsForZygote.add("--enable-safemode"); 587 } 588 if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { 589 argsForZygote.add("--enable-debugger"); 590 } 591 if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { 592 argsForZygote.add("--enable-checkjni"); 593 } 594 if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { 595 argsForZygote.add("--enable-assert"); 596 } 597 if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER) { 598 argsForZygote.add("--mount-external-multiuser"); 599 } else if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER_ALL) { 600 argsForZygote.add("--mount-external-multiuser-all"); 601 } 602 argsForZygote.add("--target-sdk-version=" + targetSdkVersion); 603 604 //TODO optionally enable debuger 605 //argsForZygote.add("--enable-debugger"); 606 607 // --setgroups is a comma-separated list 608 if (gids != null && gids.length > 0) { 609 StringBuilder sb = new StringBuilder(); 610 sb.append("--setgroups="); 611 612 int sz = gids.length; 613 for (int i = 0; i < sz; i++) { 614 if (i != 0) { 615 sb.append(','); 616 } 617 sb.append(gids[i]); 618 } 619 620 argsForZygote.add(sb.toString()); 621 } 622 623 if (niceName != null) { 624 argsForZygote.add("--nice-name=" + niceName); 625 } 626 627 if (seInfo != null) { 628 argsForZygote.add("--seinfo=" + seInfo); 629 } 630 631 argsForZygote.add(processClass); 632 633 if (extraArgs != null) { 634 for (String arg : extraArgs) { 635 argsForZygote.add(arg); 636 } 637 } 638 639 return zygoteSendArgsAndGetResult(argsForZygote); 640 } 641 } 642 643 /** 644 * Returns elapsed milliseconds of the time this process has run. 645 * @return Returns the number of milliseconds this process has return. 646 */ 647 public static final native long getElapsedCpuTime(); 648 649 /** 650 * Returns the identifier of this process, which can be used with 651 * {@link #killProcess} and {@link #sendSignal}. 652 */ 653 public static final int myPid() { 654 return Libcore.os.getpid(); 655 } 656 657 /** 658 * Returns the identifier of this process' parent. 659 * @hide 660 */ 661 public static final int myPpid() { 662 return Libcore.os.getppid(); 663 } 664 665 /** 666 * Returns the identifier of the calling thread, which be used with 667 * {@link #setThreadPriority(int, int)}. 668 */ 669 public static final int myTid() { 670 return Libcore.os.gettid(); 671 } 672 673 /** 674 * Returns the identifier of this process's uid. This is the kernel uid 675 * that the process is running under, which is the identity of its 676 * app-specific sandbox. It is different from {@link #myUserHandle} in that 677 * a uid identifies a specific app sandbox in a specific user. 678 */ 679 public static final int myUid() { 680 return Libcore.os.getuid(); 681 } 682 683 /** 684 * Returns this process's user handle. This is the 685 * user the process is running under. It is distinct from 686 * {@link #myUid()} in that a particular user will have multiple 687 * distinct apps running under it each with their own uid. 688 */ 689 public static final UserHandle myUserHandle() { 690 return new UserHandle(UserHandle.getUserId(myUid())); 691 } 692 693 /** 694 * Returns whether the current process is in an isolated sandbox. 695 * @hide 696 */ 697 public static final boolean isIsolated() { 698 int uid = UserHandle.getAppId(myUid()); 699 return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; 700 } 701 702 /** 703 * Returns the UID assigned to a particular user name, or -1 if there is 704 * none. If the given string consists of only numbers, it is converted 705 * directly to a uid. 706 */ 707 public static final native int getUidForName(String name); 708 709 /** 710 * Returns the GID assigned to a particular user name, or -1 if there is 711 * none. If the given string consists of only numbers, it is converted 712 * directly to a gid. 713 */ 714 public static final native int getGidForName(String name); 715 716 /** 717 * Returns a uid for a currently running process. 718 * @param pid the process id 719 * @return the uid of the process, or -1 if the process is not running. 720 * @hide pending API council review 721 */ 722 public static final int getUidForPid(int pid) { 723 String[] procStatusLabels = { "Uid:" }; 724 long[] procStatusValues = new long[1]; 725 procStatusValues[0] = -1; 726 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 727 return (int) procStatusValues[0]; 728 } 729 730 /** 731 * Returns the parent process id for a currently running process. 732 * @param pid the process id 733 * @return the parent process id of the process, or -1 if the process is not running. 734 * @hide 735 */ 736 public static final int getParentPid(int pid) { 737 String[] procStatusLabels = { "PPid:" }; 738 long[] procStatusValues = new long[1]; 739 procStatusValues[0] = -1; 740 Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); 741 return (int) procStatusValues[0]; 742 } 743 744 /** 745 * Returns the thread group leader id for a currently running thread. 746 * @param tid the thread id 747 * @return the thread group leader id of the thread, or -1 if the thread is not running. 748 * This is same as what getpid(2) would return if called by tid. 749 * @hide 750 */ 751 public static final int getThreadGroupLeader(int tid) { 752 String[] procStatusLabels = { "Tgid:" }; 753 long[] procStatusValues = new long[1]; 754 procStatusValues[0] = -1; 755 Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); 756 return (int) procStatusValues[0]; 757 } 758 759 /** 760 * Set the priority of a thread, based on Linux priorities. 761 * 762 * @param tid The identifier of the thread/process to change. 763 * @param priority A Linux priority level, from -20 for highest scheduling 764 * priority to 19 for lowest scheduling priority. 765 * 766 * @throws IllegalArgumentException Throws IllegalArgumentException if 767 * <var>tid</var> does not exist. 768 * @throws SecurityException Throws SecurityException if your process does 769 * not have permission to modify the given thread, or to use the given 770 * priority. 771 */ 772 public static final native void setThreadPriority(int tid, int priority) 773 throws IllegalArgumentException, SecurityException; 774 775 /** 776 * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to 777 * throw an exception if passed a background-level thread priority. This is only 778 * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. 779 * 780 * @hide 781 */ 782 public static final native void setCanSelfBackground(boolean backgroundOk); 783 784 /** 785 * Sets the scheduling group for a thread. 786 * @hide 787 * @param tid The identifier of the thread to change. 788 * @param group The target group for this thread 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 * If the thread is a thread group leader, that is it's gettid() == getpid(), 796 * then the other threads in the same thread group are _not_ affected. 797 */ 798 public static final native void setThreadGroup(int tid, int group) 799 throws IllegalArgumentException, SecurityException; 800 801 /** 802 * Sets the scheduling group for a process and all child threads 803 * @hide 804 * @param pid The identifier of the process to change. 805 * @param group The target group for this process from THREAD_GROUP_*. 806 * 807 * @throws IllegalArgumentException Throws IllegalArgumentException if 808 * <var>tid</var> does not exist. 809 * @throws SecurityException Throws SecurityException if your process does 810 * not have permission to modify the given thread, or to use the given 811 * priority. 812 * 813 * group == THREAD_GROUP_DEFAULT means to move all non-background priority 814 * threads to the foreground scheduling group, but to leave background 815 * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all 816 * threads, regardless of priority, to the background scheduling group. 817 * group == THREAD_GROUP_FOREGROUND is not allowed. 818 */ 819 public static final native void setProcessGroup(int pid, int group) 820 throws IllegalArgumentException, SecurityException; 821 822 /** 823 * Return the scheduling group of requested process. 824 * 825 * @hide 826 */ 827 public static final native int getProcessGroup(int pid) 828 throws IllegalArgumentException, SecurityException; 829 830 /** 831 * Set the priority of the calling thread, based on Linux priorities. See 832 * {@link #setThreadPriority(int, int)} for more information. 833 * 834 * @param priority A Linux priority level, from -20 for highest scheduling 835 * priority to 19 for lowest scheduling priority. 836 * 837 * @throws IllegalArgumentException Throws IllegalArgumentException if 838 * <var>tid</var> does not exist. 839 * @throws SecurityException Throws SecurityException if your process does 840 * not have permission to modify the given thread, or to use the given 841 * priority. 842 * 843 * @see #setThreadPriority(int, int) 844 */ 845 public static final native void setThreadPriority(int priority) 846 throws IllegalArgumentException, SecurityException; 847 848 /** 849 * Return the current priority of a thread, based on Linux priorities. 850 * 851 * @param tid The identifier of the thread/process to change. 852 * 853 * @return Returns the current priority, as a Linux priority level, 854 * from -20 for highest scheduling priority to 19 for lowest scheduling 855 * priority. 856 * 857 * @throws IllegalArgumentException Throws IllegalArgumentException if 858 * <var>tid</var> does not exist. 859 */ 860 public static final native int getThreadPriority(int tid) 861 throws IllegalArgumentException; 862 863 /** 864 * Set the scheduling policy and priority of a thread, based on Linux. 865 * 866 * @param tid The identifier of the thread/process to change. 867 * @param policy A Linux scheduling policy such as SCHED_OTHER etc. 868 * @param priority A Linux priority level in a range appropriate for the given policy. 869 * 870 * @throws IllegalArgumentException Throws IllegalArgumentException if 871 * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. 872 * @throws SecurityException Throws SecurityException if your process does 873 * not have permission to modify the given thread, or to use the given 874 * scheduling policy or priority. 875 * 876 * {@hide} 877 */ 878 public static final native void setThreadScheduler(int tid, int policy, int priority) 879 throws IllegalArgumentException; 880 881 /** 882 * Determine whether the current environment supports multiple processes. 883 * 884 * @return Returns true if the system can run in multiple processes, else 885 * false if everything is running in a single process. 886 * 887 * @deprecated This method always returns true. Do not use. 888 */ 889 @Deprecated 890 public static final boolean supportsProcesses() { 891 return true; 892 } 893 894 /** 895 * Set the out-of-memory badness adjustment for a process. 896 * 897 * @param pid The process identifier to set. 898 * @param amt Adjustment value -- linux allows -16 to +15. 899 * 900 * @return Returns true if the underlying system supports this 901 * feature, else false. 902 * 903 * {@hide} 904 */ 905 public static final native boolean setOomAdj(int pid, int amt); 906 907 /** 908 * Adjust the swappiness level for a process. 909 * 910 * @param pid The process identifier to set. 911 * @param is_increased Whether swappiness should be increased or default. 912 * 913 * @return Returns true if the underlying system supports this 914 * feature, else false. 915 * 916 * {@hide} 917 */ 918 public static final native boolean setSwappiness(int pid, boolean is_increased); 919 920 /** 921 * Change this process's argv[0] parameter. This can be useful to show 922 * more descriptive information in things like the 'ps' command. 923 * 924 * @param text The new name of this process. 925 * 926 * {@hide} 927 */ 928 public static final native void setArgV0(String text); 929 930 /** 931 * Kill the process with the given PID. 932 * Note that, though this API allows us to request to 933 * kill any process based on its PID, the kernel will 934 * still impose standard restrictions on which PIDs you 935 * are actually able to kill. Typically this means only 936 * the process running the caller's packages/application 937 * and any additional processes created by that app; packages 938 * sharing a common UID will also be able to kill each 939 * other's processes. 940 */ 941 public static final void killProcess(int pid) { 942 sendSignal(pid, SIGNAL_KILL); 943 } 944 945 /** @hide */ 946 public static final native int setUid(int uid); 947 948 /** @hide */ 949 public static final native int setGid(int uid); 950 951 /** 952 * Send a signal to the given process. 953 * 954 * @param pid The pid of the target process. 955 * @param signal The signal to send. 956 */ 957 public static final native void sendSignal(int pid, int signal); 958 959 /** 960 * @hide 961 * Private impl for avoiding a log message... DO NOT USE without doing 962 * your own log, or the Android Illuminati will find you some night and 963 * beat you up. 964 */ 965 public static final void killProcessQuiet(int pid) { 966 sendSignalQuiet(pid, SIGNAL_KILL); 967 } 968 969 /** 970 * @hide 971 * Private impl for avoiding a log message... DO NOT USE without doing 972 * your own log, or the Android Illuminati will find you some night and 973 * beat you up. 974 */ 975 public static final native void sendSignalQuiet(int pid, int signal); 976 977 /** @hide */ 978 public static final native long getFreeMemory(); 979 980 /** @hide */ 981 public static final native long getTotalMemory(); 982 983 /** @hide */ 984 public static final native void readProcLines(String path, 985 String[] reqFields, long[] outSizes); 986 987 /** @hide */ 988 public static final native int[] getPids(String path, int[] lastArray); 989 990 /** @hide */ 991 public static final int PROC_TERM_MASK = 0xff; 992 /** @hide */ 993 public static final int PROC_ZERO_TERM = 0; 994 /** @hide */ 995 public static final int PROC_SPACE_TERM = (int)' '; 996 /** @hide */ 997 public static final int PROC_TAB_TERM = (int)'\t'; 998 /** @hide */ 999 public static final int PROC_COMBINE = 0x100; 1000 /** @hide */ 1001 public static final int PROC_PARENS = 0x200; 1002 /** @hide */ 1003 public static final int PROC_QUOTES = 0x400; 1004 /** @hide */ 1005 public static final int PROC_OUT_STRING = 0x1000; 1006 /** @hide */ 1007 public static final int PROC_OUT_LONG = 0x2000; 1008 /** @hide */ 1009 public static final int PROC_OUT_FLOAT = 0x4000; 1010 1011 /** @hide */ 1012 public static final native boolean readProcFile(String file, int[] format, 1013 String[] outStrings, long[] outLongs, float[] outFloats); 1014 1015 /** @hide */ 1016 public static final native boolean parseProcLine(byte[] buffer, int startIndex, 1017 int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); 1018 1019 /** @hide */ 1020 public static final native int[] getPidsForCommands(String[] cmds); 1021 1022 /** 1023 * Gets the total Pss value for a given process, in bytes. 1024 * 1025 * @param pid the process to the Pss for 1026 * @return the total Pss value for the given process in bytes, 1027 * or -1 if the value cannot be determined 1028 * @hide 1029 */ 1030 public static final native long getPss(int pid); 1031 1032 /** 1033 * Specifies the outcome of having started a process. 1034 * @hide 1035 */ 1036 public static final class ProcessStartResult { 1037 /** 1038 * The PID of the newly started process. 1039 * Always >= 0. (If the start failed, an exception will have been thrown instead.) 1040 */ 1041 public int pid; 1042 1043 /** 1044 * True if the process was started with a wrapper attached. 1045 */ 1046 public boolean usingWrapper; 1047 } 1048 } 1049
