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. * * When invokeWith is not null, the process will be started as a fresh app * and not a zygote fork. Note that this is only allowed for uid 0 or when * debugFlags contains DEBUG_ENABLE_DEBUGGER. * * @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 invokeWith null-ok the command to invoke 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 instructionSet, String appDataDir, String invokeWith, String[] zygoteArgs) { return zygoteProcess.start(processClass, niceName, uid, gid, gids, debugFlags, mountExternal, targetSdkVersion, seInfo, abi, instructionSet, appDataDir, invokeWith, zygoteArgs); } /** @hide */ public static final ProcessStartResult startWebView(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 invokeWith, String[] zygoteArgs) { return WebViewZygote.getProcess().start(processClass, niceName, uid, gid, gids, debugFlags, mountExternal, targetSdkVersion, seInfo, abi, instructionSet, appDataDir, invokeWith, zygoteArgs); } /** * 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(); /** * Return the {@link SystemClock#elapsedRealtime()} at which this process was started. */ public static final long getStartElapsedRealtime() { return sStartElapsedRealtime; } /** * Return the {@link SystemClock#uptimeMillis()} at which this process was started. */ public static final long getStartUptimeMillis() { return sStartUptimeMillis; } /** @hide */ public static final void setStartTimes(long elapsedRealtime, long uptimeMillis) { sStartElapsedRealtime = elapsedRealtime; sStartUptimeMillis = uptimeMillis; } /** * 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 UserHandle myUserHandle() { return UserHandle.of(UserHandle.getUserId(myUid())); } /** * Returns whether the given uid belongs to an application. * @param uid A kernel uid. * @return Whether the uid corresponds to an application sandbox running in * a specific user. */ public static boolean isApplicationUid(int uid) { return UserHandle.isApp(uid); } /** * 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 * 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. * * Does not set cpuset for some historical reason, just calls * libcutils::set_sched_policy(). */ public static final native void setThreadGroup(int tid, int group) throws IllegalArgumentException, SecurityException; /** * Sets the scheduling group and the corresponding cpuset group * @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. */ public static final native void setThreadGroupAndCpuset(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. * * Always sets cpusets. */ 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; /** * On some devices, the foreground process may have one or more CPU * cores exclusively reserved for it. This method can be used to * retrieve which cores that are (if any), so the calling process * can then use sched_setaffinity() to lock a thread to these cores. * Note that the calling process must currently be running in the * foreground for this method to return any cores. * * The CPU core(s) exclusively reserved for the foreground process will * stay reserved for as long as the process stays in the foreground. * * As soon as a process leaves the foreground, those CPU cores will * no longer be reserved for it, and will most likely be reserved for * the new foreground process. It's not necessary to change the affinity * of your process when it leaves the foreground (if you had previously * set it to use a reserved core); the OS will automatically take care * of resetting the affinity at that point. * * @return an array of integers, indicating the CPU cores exclusively * reserved for this process. The array will have length zero if no * CPU cores are exclusively reserved for this process at this point * in time. */ public static final native int[] getExclusiveCores(); /** * 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; /** * Return the current scheduling policy of a thread, based on Linux. * * @param tid The identifier of the thread/process to get the scheduling 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} */ @TestApi public static final native int getThreadScheduler(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_CHAR = 0x800; /** @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(); /** * Check to see if a thread belongs to a given process. This may require * more permissions than apps generally have. * @return true if this thread belongs to a process * @hide */ public static final boolean isThreadInProcess(int tid, int pid) { StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads(); try { if (Os.access("/proc/" + tid + "/task/" + pid, OsConstants.F_OK)) { return true; } else { return false; } } catch (Exception e) { return false; } finally { StrictMode.setThreadPolicy(oldPolicy); } } }