/* * 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.system.Os; import android.util.Log; import com.android.internal.os.Zygote; import dalvik.system.VMRuntime; 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; /*package*/ class ZygoteStartFailedEx extends Exception { ZygoteStartFailedEx(String s) { super(s); } ZygoteStartFailedEx(Throwable cause) { super(cause); } ZygoteStartFailedEx(String s, Throwable cause) { super(s, cause); } } /** * Tools for managing OS processes. */ public class Process { private static final String LOG_TAG = "Process"; /** * @hide for internal use only. */ public static final String ZYGOTE_SOCKET = "zygote"; /** * @hide for internal use only. */ public static final String SECONDARY_ZYGOTE_SOCKET = "zygote_secondary"; /** * Defines the root UID. * @hide */ public static final int ROOT_UID = 0; /** * 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 UID/GID for the shared RELRO file updater process. * @hide */ public static final int SHARED_RELRO_UID = 1037; /** * 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; /** * Defines the gid shared by all applications running under the same profile. * @hide */ public static final int SHARED_USER_GID = 9997; /** * 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. * * @hide for internal use only. */ public 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; } public static ZygoteState connect(String socketAddress) throws IOException { DataInputStream zygoteInputStream = null; BufferedWriter zygoteWriter = null; final LocalSocket zygoteSocket = new LocalSocket(); try { zygoteSocket.connect(new LocalSocketAddress(socketAddress, LocalSocketAddress.Namespace.RESERVED)); zygoteInputStream = new DataInputStream(zygoteSocket.getInputStream()); zygoteWriter = new BufferedWriter(new OutputStreamWriter( zygoteSocket.getOutputStream()), 256); } catch (IOException ex) { try { zygoteSocket.close(); } catch (IOException ignore) { } throw ex; } 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); } public 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 instructionSet null-ok the instruction set to use. * @param appDataDir null-ok the data directory of the app. * @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 instructionSet, String appDataDir, String[] zygoteArgs) { try { return startViaZygote(processClass, niceName, uid, gid, gids, debugFlags, mountExternal, targetSdkVersion, seInfo, abi, instructionSet, appDataDir, 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 IOException { // 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); } /** * 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 instructionSet null-ok the instruction set to use. * @param appDataDir null-ok the data directory of the app. * @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 instructionSet, String appDataDir, String[] extraArgs) throws ZygoteStartFailedEx { synchronized(Process.class) { ArrayList<String> argsForZygote = new ArrayList<String>(); // --runtime-args, --setuid=, --setgid=, // and --setgroups= must go first argsForZygote.add("--runtime-args"); 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_JIT) != 0) { argsForZygote.add("--enable-jit"); } if ((debugFlags & Zygote.DEBUG_GENERATE_DEBUG_INFO) != 0) { argsForZygote.add("--generate-debug-info"); } if ((debugFlags & Zygote.DEBUG_ENABLE_ASSERT) != 0) { argsForZygote.add("--enable-assert"); } if (mountExternal == Zygote.MOUNT_EXTERNAL_DEFAULT) { argsForZygote.add("--mount-external-default"); } else if (mountExternal == Zygote.MOUNT_EXTERNAL_READ) { argsForZygote.add("--mount-external-read"); } else if (mountExternal == Zygote.MOUNT_EXTERNAL_WRITE) { argsForZygote.add("--mount-external-write"); } 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); } if (instructionSet != null) { argsForZygote.add("--instruction-set=" + instructionSet); } if (appDataDir != null) { argsForZygote.add("--app-data-dir=" + appDataDir); } argsForZygote.add(processClass); if (extraArgs != null) { for (String arg : extraArgs) { argsForZygote.add(arg); } } return zygoteSendArgsAndGetResult(openZygoteSocketIfNeeded(abi), argsForZygote); } } /** * Tries to establish a connection to the zygote that handles a given {@code abi}. Might block and retry if the * zygote is unresponsive. This method is a no-op if a connection is already open. * * @hide */ public static void establishZygoteConnectionForAbi(String abi) { try { openZygoteSocketIfNeeded(abi); } catch (ZygoteStartFailedEx ex) { throw new RuntimeException("Unable to connect to zygote for abi: " + abi, ex); } } /** * 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()) { try { primaryZygoteState = ZygoteState.connect(ZYGOTE_SOCKET); } catch (IOException ioe) { throw new ZygoteStartFailedEx("Error connecting to primary zygote", ioe); } } if (primaryZygoteState.matches(abi)) { return primaryZygoteState; } // The primary zygote didn't match. Try the secondary. if (secondaryZygoteState == null || secondaryZygoteState.isClosed()) { try { secondaryZygoteState = ZygoteState.connect(SECONDARY_ZYGOTE_SOCKET); } catch (IOException ioe) { throw new ZygoteStartFailedEx("Error connecting to secondary zygote", ioe); } } 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 true if the current process is a 64-bit runtime. */ public static final boolean is64Bit() { return VMRuntime.getRuntime().is64Bit(); } /** * Returns the identifier of this process, which can be used with * {@link #killProcess} and {@link #sendSignal}. */ public static final int myPid() { return Os.getpid(); } /** * Returns the identifier of this process' parent. * @hide */ public static final int myPpid() { return Os.getppid(); } /** * Returns the identifier of the calling thread, which be used with * {@link #setThreadPriority(int, int)}. */ public static final int myTid() { return 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 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() { return isIsolated(myUid()); } /** {@hide} */ public static final boolean isIsolated(int uid) { uid = UserHandle.getAppId(uid); 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; } /** * 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; } /** * Kill all processes in a process group started for the given * pid. * @hide */ public static final native int killProcessGroup(int uid, int pid); /** * Remove all process groups. Expected to be called when ActivityManager * is restarted. * @hide */ public static final native void removeAllProcessGroups(); }