android.os.Process Maven / Gradle / Ivy
Show all versions of android-all Show documentation
/*
* 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 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)}, not 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)}, not 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)}, not 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)}, not 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)}, not 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)}, not 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)}, not 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)}, not 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 abiList;
boolean mClosed;
private ZygoteState(LocalSocket socket, DataInputStream inputStream,
BufferedWriter writer, List 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.
*
* If processes are enabled, a new process is created and the
* static main() function of a processClass is executed there.
* The process will continue running after this function returns.
*
*
If processes are not enabled, a new thread in the caller's
* process is created and main() of processClass called there.
*
*
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
* processClass 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 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 argsForZygote = new ArrayList();
// --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);
}
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 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 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() {
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
* tid 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
* tid 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
* tid 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
* tid 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
* tid 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
* tid does not exist, or if priority 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();
}