| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.os; |
| |
| import android.net.LocalSocket; |
| import android.net.LocalSocketAddress; |
| import android.util.Log; |
| import com.android.internal.os.Zygote; |
| import java.io.BufferedWriter; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.nio.charset.StandardCharsets; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import libcore.io.Libcore; |
| |
| /*package*/ class ZygoteStartFailedEx extends Exception { |
| /** |
| * Something prevented the zygote process startup from happening normally |
| */ |
| |
| ZygoteStartFailedEx() {}; |
| ZygoteStartFailedEx(String s) {super(s);} |
| ZygoteStartFailedEx(Throwable cause) {super(cause);} |
| } |
| |
| /** |
| * Tools for managing OS processes. |
| */ |
| public class Process { |
| private static final String LOG_TAG = "Process"; |
| |
| private static final String ZYGOTE_SOCKET = "zygote"; |
| |
| private static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary"; |
| |
| /** |
| * Defines the UID/GID under which system code runs. |
| */ |
| public static final int SYSTEM_UID = 1000; |
| |
| /** |
| * Defines the UID/GID under which the telephony code runs. |
| */ |
| public static final int PHONE_UID = 1001; |
| |
| /** |
| * Defines the UID/GID for the user shell. |
| * @hide |
| */ |
| public static final int SHELL_UID = 2000; |
| |
| /** |
| * Defines the UID/GID for the log group. |
| * @hide |
| */ |
| public static final int LOG_UID = 1007; |
| |
| /** |
| * Defines the UID/GID for the WIFI supplicant process. |
| * @hide |
| */ |
| public static final int WIFI_UID = 1010; |
| |
| /** |
| * Defines the UID/GID for the mediaserver process. |
| * @hide |
| */ |
| public static final int MEDIA_UID = 1013; |
| |
| /** |
| * Defines the UID/GID for the DRM process. |
| * @hide |
| */ |
| public static final int DRM_UID = 1019; |
| |
| /** |
| * Defines the UID/GID for the group that controls VPN services. |
| * @hide |
| */ |
| public static final int VPN_UID = 1016; |
| |
| /** |
| * Defines the UID/GID for the NFC service process. |
| * @hide |
| */ |
| public static final int NFC_UID = 1027; |
| |
| /** |
| * Defines the UID/GID for the Bluetooth service process. |
| * @hide |
| */ |
| public static final int BLUETOOTH_UID = 1002; |
| |
| /** |
| * Defines the GID for the group that allows write access to the internal media storage. |
| * @hide |
| */ |
| public static final int MEDIA_RW_GID = 1023; |
| |
| /** |
| * Access to installed package details |
| * @hide |
| */ |
| public static final int PACKAGE_INFO_GID = 1032; |
| |
| /** |
| * Defines the start of a range of UIDs (and GIDs), going from this |
| * number to {@link #LAST_APPLICATION_UID} that are reserved for assigning |
| * to applications. |
| */ |
| public static final int FIRST_APPLICATION_UID = 10000; |
| |
| /** |
| * Last of application-specific UIDs starting at |
| * {@link #FIRST_APPLICATION_UID}. |
| */ |
| public static final int LAST_APPLICATION_UID = 19999; |
| |
| /** |
| * First uid used for fully isolated sandboxed processes (with no permissions of their own) |
| * @hide |
| */ |
| public static final int FIRST_ISOLATED_UID = 99000; |
| |
| /** |
| * Last uid used for fully isolated sandboxed processes (with no permissions of their own) |
| * @hide |
| */ |
| public static final int LAST_ISOLATED_UID = 99999; |
| |
| /** |
| * First gid for applications to share resources. Used when forward-locking |
| * is enabled but all UserHandles need to be able to read the resources. |
| * @hide |
| */ |
| public static final int FIRST_SHARED_APPLICATION_GID = 50000; |
| |
| /** |
| * Last gid for applications to share resources. Used when forward-locking |
| * is enabled but all UserHandles need to be able to read the resources. |
| * @hide |
| */ |
| public static final int LAST_SHARED_APPLICATION_GID = 59999; |
| |
| /** |
| * Standard priority of application threads. |
| * Use with {@link #setThreadPriority(int)} and |
| * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| * {@link java.lang.Thread} class. |
| */ |
| public static final int THREAD_PRIORITY_DEFAULT = 0; |
| |
| /* |
| * *************************************** |
| * ** Keep in sync with utils/threads.h ** |
| * *************************************** |
| */ |
| |
| /** |
| * Lowest available thread priority. Only for those who really, really |
| * don't want to run if anything else is happening. |
| * Use with {@link #setThreadPriority(int)} and |
| * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| * {@link java.lang.Thread} class. |
| */ |
| public static final int THREAD_PRIORITY_LOWEST = 19; |
| |
| /** |
| * Standard priority background threads. This gives your thread a slightly |
| * lower than normal priority, so that it will have less chance of impacting |
| * the responsiveness of the user interface. |
| * Use with {@link #setThreadPriority(int)} and |
| * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| * {@link java.lang.Thread} class. |
| */ |
| public static final int THREAD_PRIORITY_BACKGROUND = 10; |
| |
| /** |
| * Standard priority of threads that are currently running a user interface |
| * that the user is interacting with. Applications can not normally |
| * change to this priority; the system will automatically adjust your |
| * application threads as the user moves through the UI. |
| * Use with {@link #setThreadPriority(int)} and |
| * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| * {@link java.lang.Thread} class. |
| */ |
| public static final int THREAD_PRIORITY_FOREGROUND = -2; |
| |
| /** |
| * Standard priority of system display threads, involved in updating |
| * the user interface. Applications can not |
| * normally change to this priority. |
| * Use with {@link #setThreadPriority(int)} and |
| * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| * {@link java.lang.Thread} class. |
| */ |
| public static final int THREAD_PRIORITY_DISPLAY = -4; |
| |
| /** |
| * Standard priority of the most important display threads, for compositing |
| * the screen and retrieving input events. Applications can not normally |
| * change to this priority. |
| * Use with {@link #setThreadPriority(int)} and |
| * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| * {@link java.lang.Thread} class. |
| */ |
| public static final int THREAD_PRIORITY_URGENT_DISPLAY = -8; |
| |
| /** |
| * Standard priority of audio threads. Applications can not normally |
| * change to this priority. |
| * Use with {@link #setThreadPriority(int)} and |
| * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| * {@link java.lang.Thread} class. |
| */ |
| public static final int THREAD_PRIORITY_AUDIO = -16; |
| |
| /** |
| * Standard priority of the most important audio threads. |
| * Applications can not normally change to this priority. |
| * Use with {@link #setThreadPriority(int)} and |
| * {@link #setThreadPriority(int, int)}, <b>not</b> with the normal |
| * {@link java.lang.Thread} class. |
| */ |
| public static final int THREAD_PRIORITY_URGENT_AUDIO = -19; |
| |
| /** |
| * Minimum increment to make a priority more favorable. |
| */ |
| public static final int THREAD_PRIORITY_MORE_FAVORABLE = -1; |
| |
| /** |
| * Minimum increment to make a priority less favorable. |
| */ |
| public static final int THREAD_PRIORITY_LESS_FAVORABLE = +1; |
| |
| /** |
| * Default scheduling policy |
| * @hide |
| */ |
| public static final int SCHED_OTHER = 0; |
| |
| /** |
| * First-In First-Out scheduling policy |
| * @hide |
| */ |
| public static final int SCHED_FIFO = 1; |
| |
| /** |
| * Round-Robin scheduling policy |
| * @hide |
| */ |
| public static final int SCHED_RR = 2; |
| |
| /** |
| * Batch scheduling policy |
| * @hide |
| */ |
| public static final int SCHED_BATCH = 3; |
| |
| /** |
| * Idle scheduling policy |
| * @hide |
| */ |
| public static final int SCHED_IDLE = 5; |
| |
| // Keep in sync with SP_* constants of enum type SchedPolicy |
| // declared in system/core/include/cutils/sched_policy.h, |
| // except THREAD_GROUP_DEFAULT does not correspond to any SP_* value. |
| |
| /** |
| * Default thread group - |
| * has meaning with setProcessGroup() only, cannot be used with setThreadGroup(). |
| * When used with setProcessGroup(), the group of each thread in the process |
| * is conditionally changed based on that thread's current priority, as follows: |
| * threads with priority numerically less than THREAD_PRIORITY_BACKGROUND |
| * are moved to foreground thread group. All other threads are left unchanged. |
| * @hide |
| */ |
| public static final int THREAD_GROUP_DEFAULT = -1; |
| |
| /** |
| * Background thread group - All threads in |
| * this group are scheduled with a reduced share of the CPU. |
| * Value is same as constant SP_BACKGROUND of enum SchedPolicy. |
| * FIXME rename to THREAD_GROUP_BACKGROUND. |
| * @hide |
| */ |
| public static final int THREAD_GROUP_BG_NONINTERACTIVE = 0; |
| |
| /** |
| * Foreground thread group - All threads in |
| * this group are scheduled with a normal share of the CPU. |
| * Value is same as constant SP_FOREGROUND of enum SchedPolicy. |
| * Not used at this level. |
| * @hide |
| **/ |
| private static final int THREAD_GROUP_FOREGROUND = 1; |
| |
| /** |
| * System thread group. |
| * @hide |
| **/ |
| public static final int THREAD_GROUP_SYSTEM = 2; |
| |
| /** |
| * Application audio thread group. |
| * @hide |
| **/ |
| public static final int THREAD_GROUP_AUDIO_APP = 3; |
| |
| /** |
| * System audio thread group. |
| * @hide |
| **/ |
| public static final int THREAD_GROUP_AUDIO_SYS = 4; |
| |
| public static final int SIGNAL_QUIT = 3; |
| public static final int SIGNAL_KILL = 9; |
| public static final int SIGNAL_USR1 = 10; |
| |
| /** |
| * State for communicating with the zygote process. |
| */ |
| static class ZygoteState { |
| final LocalSocket socket; |
| final DataInputStream inputStream; |
| final BufferedWriter writer; |
| final List<String> abiList; |
| |
| boolean mClosed; |
| |
| private ZygoteState(LocalSocket socket, DataInputStream inputStream, |
| BufferedWriter writer, List<String> abiList) { |
| this.socket = socket; |
| this.inputStream = inputStream; |
| this.writer = writer; |
| this.abiList = abiList; |
| } |
| |
| static ZygoteState connect(String socketAddress, int tries) throws ZygoteStartFailedEx { |
| LocalSocket zygoteSocket = null; |
| DataInputStream zygoteInputStream = null; |
| BufferedWriter zygoteWriter = null; |
| |
| /* |
| * See bug #811181: Sometimes runtime can make it up before zygote. |
| * Really, we'd like to do something better to avoid this condition, |
| * but for now just wait a bit... |
| * |
| * TODO: This bug was filed in 2007. Get rid of this code. The zygote |
| * forks the system_server so it shouldn't be possible for the zygote |
| * socket to be brought up after the system_server is. |
| */ |
| for (int i = 0; i < tries; i++) { |
| if (i > 0) { |
| try { |
| Log.i("Zygote", "Zygote not up yet, sleeping..."); |
| Thread.sleep(ZYGOTE_RETRY_MILLIS); |
| } catch (InterruptedException ex) { |
| throw new ZygoteStartFailedEx(ex); |
| } |
| } |
| |
| try { |
| zygoteSocket = new LocalSocket(); |
| zygoteSocket.connect(new LocalSocketAddress(socketAddress, |
| LocalSocketAddress.Namespace.RESERVED)); |
| |
| zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); |
| |
| zygoteWriter = new BufferedWriter(new OutputStreamWriter( |
| zygoteSocket.getOutputStream()), 256); |
| break; |
| } catch (IOException ex) { |
| if (zygoteSocket != null) { |
| try { |
| zygoteSocket.close(); |
| } catch (IOException ex2) { |
| Log.e(LOG_TAG,"I/O exception on close after exception", ex2); |
| } |
| } |
| |
| zygoteSocket = null; |
| } |
| } |
| |
| if (zygoteSocket == null) { |
| throw new ZygoteStartFailedEx("connect failed"); |
| } |
| |
| String abiListString = getAbiList(zygoteWriter, zygoteInputStream); |
| Log.i("Zygote", "Process: zygote socket opened, supported ABIS: " + abiListString); |
| |
| return new ZygoteState(zygoteSocket, zygoteInputStream, zygoteWriter, |
| Arrays.asList(abiListString.split(","))); |
| } |
| |
| boolean matches(String abi) { |
| return abiList.contains(abi); |
| } |
| |
| void close() { |
| try { |
| socket.close(); |
| } catch (IOException ex) { |
| Log.e(LOG_TAG,"I/O exception on routine close", ex); |
| } |
| |
| mClosed = true; |
| } |
| |
| boolean isClosed() { |
| return mClosed; |
| } |
| } |
| |
| /** |
| * The state of the connection to the primary zygote. |
| */ |
| static ZygoteState primaryZygoteState; |
| |
| /** |
| * The state of the connection to the secondary zygote. |
| */ |
| static ZygoteState secondaryZygoteState; |
| |
| /** |
| * Start a new process. |
| * |
| * <p>If processes are enabled, a new process is created and the |
| * static main() function of a <var>processClass</var> is executed there. |
| * The process will continue running after this function returns. |
| * |
| * <p>If processes are not enabled, a new thread in the caller's |
| * process is created and main() of <var>processClass</var> called there. |
| * |
| * <p>The niceName parameter, if not an empty string, is a custom name to |
| * give to the process instead of using processClass. This allows you to |
| * make easily identifyable processes even if you are using the same base |
| * <var>processClass</var> to start them. |
| * |
| * @param processClass The class to use as the process's main entry |
| * point. |
| * @param niceName A more readable name to use for the process. |
| * @param uid The user-id under which the process will run. |
| * @param gid The group-id under which the process will run. |
| * @param gids Additional group-ids associated with the process. |
| * @param debugFlags Additional flags. |
| * @param targetSdkVersion The target SDK version for the app. |
| * @param seInfo null-ok SELinux information for the new process. |
| * @param abi non-null the ABI this app should be started with. |
| * @param zygoteArgs Additional arguments to supply to the zygote process. |
| * |
| * @return An object that describes the result of the attempt to start the process. |
| * @throws RuntimeException on fatal start failure |
| * |
| * {@hide} |
| */ |
| public static final ProcessStartResult start(final String processClass, |
| final String niceName, |
| int uid, int gid, int[] gids, |
| int debugFlags, int mountExternal, |
| int targetSdkVersion, |
| String seInfo, |
| String abi, |
| String[] zygoteArgs) { |
| try { |
| return startViaZygote(processClass, niceName, uid, gid, gids, |
| debugFlags, mountExternal, targetSdkVersion, seInfo, |
| abi, zygoteArgs); |
| } catch (ZygoteStartFailedEx ex) { |
| Log.e(LOG_TAG, |
| "Starting VM process through Zygote failed"); |
| throw new RuntimeException( |
| "Starting VM process through Zygote failed", ex); |
| } |
| } |
| |
| /** retry interval for opening a zygote socket */ |
| static final int ZYGOTE_RETRY_MILLIS = 500; |
| |
| /** |
| * Queries the zygote for the list of ABIS it supports. |
| * |
| * @throws ZygoteStartFailedEx if the query failed. |
| */ |
| private static String getAbiList(BufferedWriter writer, DataInputStream inputStream) |
| throws ZygoteStartFailedEx { |
| try { |
| |
| // Each query starts with the argument count (1 in this case) |
| writer.write("1"); |
| // ... followed by a new-line. |
| writer.newLine(); |
| // ... followed by our only argument. |
| writer.write("--query-abi-list"); |
| writer.newLine(); |
| writer.flush(); |
| |
| // The response is a length prefixed stream of ASCII bytes. |
| int numBytes = inputStream.readInt(); |
| byte[] bytes = new byte[numBytes]; |
| inputStream.readFully(bytes); |
| |
| return new String(bytes, StandardCharsets.US_ASCII); |
| } catch (IOException ioe) { |
| throw new ZygoteStartFailedEx(ioe); |
| } |
| } |
| |
| /** |
| * Sends an argument list to the zygote process, which starts a new child |
| * and returns the child's pid. Please note: the present implementation |
| * replaces newlines in the argument list with spaces. |
| * |
| * @throws ZygoteStartFailedEx if process start failed for any reason |
| */ |
| private static ProcessStartResult zygoteSendArgsAndGetResult( |
| ZygoteState zygoteState, ArrayList<String> args) |
| throws ZygoteStartFailedEx { |
| try { |
| /** |
| * See com.android.internal.os.ZygoteInit.readArgumentList() |
| * Presently the wire format to the zygote process is: |
| * a) a count of arguments (argc, in essence) |
| * b) a number of newline-separated argument strings equal to count |
| * |
| * After the zygote process reads these it will write the pid of |
| * the child or -1 on failure, followed by boolean to |
| * indicate whether a wrapper process was used. |
| */ |
| final BufferedWriter writer = zygoteState.writer; |
| final DataInputStream inputStream = zygoteState.inputStream; |
| |
| writer.write(Integer.toString(args.size())); |
| writer.newLine(); |
| |
| int sz = args.size(); |
| for (int i = 0; i < sz; i++) { |
| String arg = args.get(i); |
| if (arg.indexOf('\n') >= 0) { |
| throw new ZygoteStartFailedEx( |
| "embedded newlines not allowed"); |
| } |
| writer.write(arg); |
| writer.newLine(); |
| } |
| |
| writer.flush(); |
| |
| // Should there be a timeout on this? |
| ProcessStartResult result = new ProcessStartResult(); |
| result.pid = inputStream.readInt(); |
| if (result.pid < 0) { |
| throw new ZygoteStartFailedEx("fork() failed"); |
| } |
| result.usingWrapper = inputStream.readBoolean(); |
| return result; |
| } catch (IOException ex) { |
| zygoteState.close(); |
| throw new ZygoteStartFailedEx(ex); |
| } |
| } |
| |
| /** |
| * Starts a new process via the zygote mechanism. |
| * |
| * @param processClass Class name whose static main() to run |
| * @param niceName 'nice' process name to appear in ps |
| * @param uid a POSIX uid that the new process should setuid() to |
| * @param gid a POSIX gid that the new process shuold setgid() to |
| * @param gids null-ok; a list of supplementary group IDs that the |
| * new process should setgroup() to. |
| * @param debugFlags Additional flags. |
| * @param targetSdkVersion The target SDK version for the app. |
| * @param seInfo null-ok SELinux information for the new process. |
| * @param abi the ABI the process should use. |
| * @param extraArgs Additional arguments to supply to the zygote process. |
| * @return An object that describes the result of the attempt to start the process. |
| * @throws ZygoteStartFailedEx if process start failed for any reason |
| */ |
| private static ProcessStartResult 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 abi, |
| String[] extraArgs) |
| throws ZygoteStartFailedEx { |
| synchronized(Process.class) { |
| ArrayList<String> argsForZygote = new ArrayList<String>(); |
| |
| // --runtime-init, --setuid=, --setgid=, |
| // and --setgroups= must go first |
| argsForZygote.add("--runtime-init"); |
| argsForZygote.add("--setuid=" + uid); |
| argsForZygote.add("--setgid=" + gid); |
| if ((debugFlags & Zygote.DEBUG_ENABLE_JNI_LOGGING) != 0) { |
| argsForZygote.add("--enable-jni-logging"); |
| } |
| if ((debugFlags & Zygote.DEBUG_ENABLE_SAFEMODE) != 0) { |
| argsForZygote.add("--enable-safemode"); |
| } |
| if ((debugFlags & Zygote.DEBUG_ENABLE_DEBUGGER) != 0) { |
| argsForZygote.add("--enable-debugger"); |
| } |
| if ((debugFlags & Zygote.DEBUG_ENABLE_CHECKJNI) != 0) { |
| argsForZygote.add("--enable-checkjni"); |
| } |
| if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { |
| argsForZygote.add("--enable-assert"); |
| } |
| if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER) { |
| argsForZygote.add("--mount-external-multiuser"); |
| } else if (mountExternal == Zygote.MOUNT_EXTERNAL_MULTIUSER_ALL) { |
| argsForZygote.add("--mount-external-multiuser-all"); |
| } |
| argsForZygote.add("--target-sdk-version=" + targetSdkVersion); |
| |
| //TODO optionally enable debuger |
| //argsForZygote.add("--enable-debugger"); |
| |
| // --setgroups is a comma-separated list |
| if (gids != null && gids.length > 0) { |
| StringBuilder sb = new StringBuilder(); |
| sb.append("--setgroups="); |
| |
| int sz = gids.length; |
| for (int i = 0; i < sz; i++) { |
| if (i != 0) { |
| sb.append(','); |
| } |
| sb.append(gids[i]); |
| } |
| |
| argsForZygote.add(sb.toString()); |
| } |
| |
| if (niceName != null) { |
| argsForZygote.add("--nice-name=" + niceName); |
| } |
| |
| if (seInfo != null) { |
| argsForZygote.add("--seinfo=" + seInfo); |
| } |
| |
| argsForZygote.add(processClass); |
| |
| if (extraArgs != null) { |
| for (String arg : extraArgs) { |
| argsForZygote.add(arg); |
| } |
| } |
| |
| return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); |
| } |
| } |
| |
| /** |
| * Returns the number of times we attempt a connection to the zygote. We |
| * sleep for {@link #ZYGOTE_RETRY_MILLIS} milliseconds between each try. |
| * |
| * This could probably be removed, see TODO in {@code ZygoteState#connect}. |
| */ |
| private static int getNumTries(ZygoteState state) { |
| // Retry 10 times for the first connection to each zygote. |
| if (state == null) { |
| return 11; |
| } |
| |
| // This means the connection has already been established, but subsequently |
| // closed, possibly due to an IOException. We retry just once if that's the |
| // case. |
| return 1; |
| } |
| |
| /** |
| * Tries to open socket to Zygote process if not already open. If |
| * already open, does nothing. May block and retry. |
| */ |
| private static ZygoteState openZygoteSocketIfNeeded(String abi) throws ZygoteStartFailedEx { |
| if (primaryZygoteState == null || primaryZygoteState.isClosed()) { |
| primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET, getNumTries(primaryZygoteState)); |
| } |
| |
| if (primaryZygoteState.matches(abi)) { |
| return primaryZygoteState; |
| } |
| |
| // The primary zygote didn't match. Try the secondary. |
| if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { |
| secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET, |
| getNumTries(secondaryZygoteState)); |
| } |
| |
| if (secondaryZygoteState.matches(abi)) { |
| return secondaryZygoteState; |
| } |
| |
| throw new ZygoteStartFailedEx("Unsupported zygote ABI: " + abi); |
| } |
| |
| /** |
| * Returns elapsed milliseconds of the time this process has run. |
| * @return Returns the number of milliseconds this process has return. |
| */ |
| public static final native long getElapsedCpuTime(); |
| |
| /** |
| * Returns the identifier of this process, which can be used with |
| * {@link #killProcess} and {@link #sendSignal}. |
| */ |
| public static final int myPid() { |
| return Libcore.os.getpid(); |
| } |
| |
| /** |
| * Returns the identifier of this process' parent. |
| * @hide |
| */ |
| public static final int myPpid() { |
| return Libcore.os.getppid(); |
| } |
| |
| /** |
| * Returns the identifier of the calling thread, which be used with |
| * {@link #setThreadPriority(int, int)}. |
| */ |
| public static final int myTid() { |
| return Libcore.os.gettid(); |
| } |
| |
| /** |
| * Returns the identifier of this process's uid. This is the kernel uid |
| * that the process is running under, which is the identity of its |
| * app-specific sandbox. It is different from {@link #myUserHandle} in that |
| * a uid identifies a specific app sandbox in a specific user. |
| */ |
| public static final int myUid() { |
| return Libcore.os.getuid(); |
| } |
| |
| /** |
| * Returns this process's user handle. This is the |
| * user the process is running under. It is distinct from |
| * {@link #myUid()} in that a particular user will have multiple |
| * distinct apps running under it each with their own uid. |
| */ |
| public static final UserHandle myUserHandle() { |
| return new UserHandle(UserHandle.getUserId(myUid())); |
| } |
| |
| /** |
| * Returns whether the current process is in an isolated sandbox. |
| * @hide |
| */ |
| public static final boolean isIsolated() { |
| int uid = UserHandle.getAppId(myUid()); |
| return uid >= FIRST_ISOLATED_UID && uid <= LAST_ISOLATED_UID; |
| } |
| |
| /** |
| * Returns the UID assigned to a particular user name, or -1 if there is |
| * none. If the given string consists of only numbers, it is converted |
| * directly to a uid. |
| */ |
| public static final native int getUidForName(String name); |
| |
| /** |
| * Returns the GID assigned to a particular user name, or -1 if there is |
| * none. If the given string consists of only numbers, it is converted |
| * directly to a gid. |
| */ |
| public static final native int getGidForName(String name); |
| |
| /** |
| * Returns a uid for a currently running process. |
| * @param pid the process id |
| * @return the uid of the process, or -1 if the process is not running. |
| * @hide pending API council review |
| */ |
| public static final int getUidForPid(int pid) { |
| String[] procStatusLabels = { "Uid:" }; |
| long[] procStatusValues = new long[1]; |
| procStatusValues[0] = -1; |
| Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); |
| return (int) procStatusValues[0]; |
| } |
| |
| /** |
| * Returns the parent process id for a currently running process. |
| * @param pid the process id |
| * @return the parent process id of the process, or -1 if the process is not running. |
| * @hide |
| */ |
| public static final int getParentPid(int pid) { |
| String[] procStatusLabels = { "PPid:" }; |
| long[] procStatusValues = new long[1]; |
| procStatusValues[0] = -1; |
| Process.readProcLines("/proc/" + pid + "/status", procStatusLabels, procStatusValues); |
| return (int) procStatusValues[0]; |
| } |
| |
| /** |
| * Returns the thread group leader id for a currently running thread. |
| * @param tid the thread id |
| * @return the thread group leader id of the thread, or -1 if the thread is not running. |
| * This is same as what getpid(2) would return if called by tid. |
| * @hide |
| */ |
| public static final int getThreadGroupLeader(int tid) { |
| String[] procStatusLabels = { "Tgid:" }; |
| long[] procStatusValues = new long[1]; |
| procStatusValues[0] = -1; |
| Process.readProcLines("/proc/" + tid + "/status", procStatusLabels, procStatusValues); |
| return (int) procStatusValues[0]; |
| } |
| |
| /** |
| * Set the priority of a thread, based on Linux priorities. |
| * |
| * @param tid The identifier of the thread/process to change. |
| * @param priority A Linux priority level, from -20 for highest scheduling |
| * priority to 19 for lowest scheduling priority. |
| * |
| * @throws IllegalArgumentException Throws IllegalArgumentException if |
| * <var>tid</var> does not exist. |
| * @throws SecurityException Throws SecurityException if your process does |
| * not have permission to modify the given thread, or to use the given |
| * priority. |
| */ |
| public static final native void setThreadPriority(int tid, int priority) |
| throws IllegalArgumentException, SecurityException; |
| |
| /** |
| * Call with 'false' to cause future calls to {@link #setThreadPriority(int)} to |
| * throw an exception if passed a background-level thread priority. This is only |
| * effective if the JNI layer is built with GUARD_THREAD_PRIORITY defined to 1. |
| * |
| * @hide |
| */ |
| public static final native void setCanSelfBackground(boolean backgroundOk); |
| |
| /** |
| * Sets the scheduling group for a thread. |
| * @hide |
| * @param tid The identifier of the thread to change. |
| * @param group The target group for this thread from THREAD_GROUP_*. |
| * |
| * @throws IllegalArgumentException Throws IllegalArgumentException if |
| * <var>tid</var> does not exist. |
| * @throws SecurityException Throws SecurityException if your process does |
| * not have permission to modify the given thread, or to use the given |
| * priority. |
| * If the thread is a thread group leader, that is it's gettid() == getpid(), |
| * then the other threads in the same thread group are _not_ affected. |
| */ |
| public static final native void setThreadGroup(int tid, int group) |
| throws IllegalArgumentException, SecurityException; |
| |
| /** |
| * Sets the scheduling group for a process and all child threads |
| * @hide |
| * @param pid The identifier of the process to change. |
| * @param group The target group for this process from THREAD_GROUP_*. |
| * |
| * @throws IllegalArgumentException Throws IllegalArgumentException if |
| * <var>tid</var> does not exist. |
| * @throws SecurityException Throws SecurityException if your process does |
| * not have permission to modify the given thread, or to use the given |
| * priority. |
| * |
| * group == THREAD_GROUP_DEFAULT means to move all non-background priority |
| * threads to the foreground scheduling group, but to leave background |
| * priority threads alone. group == THREAD_GROUP_BG_NONINTERACTIVE moves all |
| * threads, regardless of priority, to the background scheduling group. |
| * group == THREAD_GROUP_FOREGROUND is not allowed. |
| */ |
| public static final native void setProcessGroup(int pid, int group) |
| throws IllegalArgumentException, SecurityException; |
| |
| /** |
| * Return the scheduling group of requested process. |
| * |
| * @hide |
| */ |
| public static final native int getProcessGroup(int pid) |
| throws IllegalArgumentException, SecurityException; |
| |
| /** |
| * Set the priority of the calling thread, based on Linux priorities. See |
| * {@link #setThreadPriority(int, int)} for more information. |
| * |
| * @param priority A Linux priority level, from -20 for highest scheduling |
| * priority to 19 for lowest scheduling priority. |
| * |
| * @throws IllegalArgumentException Throws IllegalArgumentException if |
| * <var>tid</var> does not exist. |
| * @throws SecurityException Throws SecurityException if your process does |
| * not have permission to modify the given thread, or to use the given |
| * priority. |
| * |
| * @see #setThreadPriority(int, int) |
| */ |
| public static final native void setThreadPriority(int priority) |
| throws IllegalArgumentException, SecurityException; |
| |
| /** |
| * Return the current priority of a thread, based on Linux priorities. |
| * |
| * @param tid The identifier of the thread/process to change. |
| * |
| * @return Returns the current priority, as a Linux priority level, |
| * from -20 for highest scheduling priority to 19 for lowest scheduling |
| * priority. |
| * |
| * @throws IllegalArgumentException Throws IllegalArgumentException if |
| * <var>tid</var> does not exist. |
| */ |
| public static final native int getThreadPriority(int tid) |
| throws IllegalArgumentException; |
| |
| /** |
| * Set the scheduling policy and priority of a thread, based on Linux. |
| * |
| * @param tid The identifier of the thread/process to change. |
| * @param policy A Linux scheduling policy such as SCHED_OTHER etc. |
| * @param priority A Linux priority level in a range appropriate for the given policy. |
| * |
| * @throws IllegalArgumentException Throws IllegalArgumentException if |
| * <var>tid</var> does not exist, or if <var>priority</var> is out of range for the policy. |
| * @throws SecurityException Throws SecurityException if your process does |
| * not have permission to modify the given thread, or to use the given |
| * scheduling policy or priority. |
| * |
| * {@hide} |
| */ |
| public static final native void setThreadScheduler(int tid, int policy, int priority) |
| throws IllegalArgumentException; |
| |
| /** |
| * Determine whether the current environment supports multiple processes. |
| * |
| * @return Returns true if the system can run in multiple processes, else |
| * false if everything is running in a single process. |
| * |
| * @deprecated This method always returns true. Do not use. |
| */ |
| @Deprecated |
| public static final boolean supportsProcesses() { |
| return true; |
| } |
| |
| /** |
| * Set the out-of-memory badness adjustment for a process. |
| * |
| * @param pid The process identifier to set. |
| * @param amt Adjustment value -- linux allows -16 to +15. |
| * |
| * @return Returns true if the underlying system supports this |
| * feature, else false. |
| * |
| * {@hide} |
| */ |
| public static final native boolean setOomAdj(int pid, int amt); |
| |
| /** |
| * Adjust the swappiness level for a process. |
| * |
| * @param pid The process identifier to set. |
| * @param is_increased Whether swappiness should be increased or default. |
| * |
| * @return Returns true if the underlying system supports this |
| * feature, else false. |
| * |
| * {@hide} |
| */ |
| public static final native boolean setSwappiness(int pid, boolean is_increased); |
| |
| /** |
| * Change this process's argv[0] parameter. This can be useful to show |
| * more descriptive information in things like the 'ps' command. |
| * |
| * @param text The new name of this process. |
| * |
| * {@hide} |
| */ |
| public static final native void setArgV0(String text); |
| |
| /** |
| * Kill the process with the given PID. |
| * Note that, though this API allows us to request to |
| * kill any process based on its PID, the kernel will |
| * still impose standard restrictions on which PIDs you |
| * are actually able to kill. Typically this means only |
| * the process running the caller's packages/application |
| * and any additional processes created by that app; packages |
| * sharing a common UID will also be able to kill each |
| * other's processes. |
| */ |
| public static final void killProcess(int pid) { |
| sendSignal(pid, SIGNAL_KILL); |
| } |
| |
| /** @hide */ |
| public static final native int setUid(int uid); |
| |
| /** @hide */ |
| public static final native int setGid(int uid); |
| |
| /** |
| * Send a signal to the given process. |
| * |
| * @param pid The pid of the target process. |
| * @param signal The signal to send. |
| */ |
| public static final native void sendSignal(int pid, int signal); |
| |
| /** |
| * @hide |
| * Private impl for avoiding a log message... DO NOT USE without doing |
| * your own log, or the Android Illuminati will find you some night and |
| * beat you up. |
| */ |
| public static final void killProcessQuiet(int pid) { |
| sendSignalQuiet(pid, SIGNAL_KILL); |
| } |
| |
| /** |
| * @hide |
| * Private impl for avoiding a log message... DO NOT USE without doing |
| * your own log, or the Android Illuminati will find you some night and |
| * beat you up. |
| */ |
| public static final native void sendSignalQuiet(int pid, int signal); |
| |
| /** @hide */ |
| public static final native long getFreeMemory(); |
| |
| /** @hide */ |
| public static final native long getTotalMemory(); |
| |
| /** @hide */ |
| public static final native void readProcLines(String path, |
| String[] reqFields, long[] outSizes); |
| |
| /** @hide */ |
| public static final native int[] getPids(String path, int[] lastArray); |
| |
| /** @hide */ |
| public static final int PROC_TERM_MASK = 0xff; |
| /** @hide */ |
| public static final int PROC_ZERO_TERM = 0; |
| /** @hide */ |
| public static final int PROC_SPACE_TERM = (int)' '; |
| /** @hide */ |
| public static final int PROC_TAB_TERM = (int)'\t'; |
| /** @hide */ |
| public static final int PROC_COMBINE = 0x100; |
| /** @hide */ |
| public static final int PROC_PARENS = 0x200; |
| /** @hide */ |
| public static final int PROC_QUOTES = 0x400; |
| /** @hide */ |
| public static final int PROC_OUT_STRING = 0x1000; |
| /** @hide */ |
| public static final int PROC_OUT_LONG = 0x2000; |
| /** @hide */ |
| public static final int PROC_OUT_FLOAT = 0x4000; |
| |
| /** @hide */ |
| public static final native boolean readProcFile(String file, int[] format, |
| String[] outStrings, long[] outLongs, float[] outFloats); |
| |
| /** @hide */ |
| public static final native boolean parseProcLine(byte[] buffer, int startIndex, |
| int endIndex, int[] format, String[] outStrings, long[] outLongs, float[] outFloats); |
| |
| /** @hide */ |
| public static final native int[] getPidsForCommands(String[] cmds); |
| |
| /** |
| * Gets the total Pss value for a given process, in bytes. |
| * |
| * @param pid the process to the Pss for |
| * @return the total Pss value for the given process in bytes, |
| * or -1 if the value cannot be determined |
| * @hide |
| */ |
| public static final native long getPss(int pid); |
| |
| /** |
| * Specifies the outcome of having started a process. |
| * @hide |
| */ |
| public static final class ProcessStartResult { |
| /** |
| * The PID of the newly started process. |
| * Always >= 0. (If the start failed, an exception will have been thrown instead.) |
| */ |
| public int pid; |
| |
| /** |
| * True if the process was started with a wrapper attached. |
| */ |
| public boolean usingWrapper; |
| } |
| } |