| /* |
| * Copyright (C) 2007 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 com.android.internal.os; |
| |
| import static android.system.OsConstants.POLLIN; |
| import static android.system.OsConstants.S_IRWXG; |
| import static android.system.OsConstants.S_IRWXO; |
| |
| import android.content.res.Resources; |
| import android.content.res.TypedArray; |
| import android.icu.impl.CacheValue; |
| import android.icu.text.DecimalFormatSymbols; |
| import android.icu.util.ULocale; |
| import android.net.LocalServerSocket; |
| import android.opengl.EGL14; |
| import android.os.Process; |
| import android.os.SystemClock; |
| import android.os.SystemProperties; |
| import android.os.Trace; |
| import android.security.keystore.AndroidKeyStoreProvider; |
| import android.system.ErrnoException; |
| import android.system.Os; |
| import android.system.OsConstants; |
| import android.system.StructPollfd; |
| import android.text.Hyphenator; |
| import android.util.EventLog; |
| import android.util.Log; |
| import android.webkit.WebViewFactory; |
| import android.widget.TextView; |
| |
| import com.android.internal.os.InstallerConnection.InstallerException; |
| |
| import dalvik.system.DexFile; |
| import dalvik.system.PathClassLoader; |
| import dalvik.system.VMRuntime; |
| import dalvik.system.ZygoteHooks; |
| |
| import libcore.io.IoUtils; |
| |
| import java.io.BufferedReader; |
| import java.io.FileDescriptor; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.security.Security; |
| import java.security.Provider; |
| import java.util.ArrayList; |
| |
| /** |
| * Startup class for the zygote process. |
| * |
| * Pre-initializes some classes, and then waits for commands on a UNIX domain |
| * socket. Based on these commands, forks off child processes that inherit |
| * the initial state of the VM. |
| * |
| * Please see {@link ZygoteConnection.Arguments} for documentation on the |
| * client protocol. |
| * |
| * @hide |
| */ |
| public class ZygoteInit { |
| private static final String TAG = "Zygote"; |
| |
| private static final String PROPERTY_DISABLE_OPENGL_PRELOADING = "ro.zygote.disable_gl_preload"; |
| private static final String PROPERTY_RUNNING_IN_CONTAINER = "ro.boot.container"; |
| |
| private static final String ANDROID_SOCKET_PREFIX = "ANDROID_SOCKET_"; |
| |
| private static final int LOG_BOOT_PROGRESS_PRELOAD_START = 3020; |
| private static final int LOG_BOOT_PROGRESS_PRELOAD_END = 3030; |
| |
| /** when preloading, GC after allocating this many bytes */ |
| private static final int PRELOAD_GC_THRESHOLD = 50000; |
| |
| private static final String ABI_LIST_ARG = "--abi-list="; |
| |
| private static final String SOCKET_NAME_ARG = "--socket-name="; |
| |
| private static LocalServerSocket sServerSocket; |
| |
| /** |
| * Used to pre-load resources. We hold a global reference on it so it |
| * never gets destroyed. |
| */ |
| private static Resources mResources; |
| |
| /** |
| * The path of a file that contains classes to preload. |
| */ |
| private static final String PRELOADED_CLASSES = "/system/etc/preloaded-classes"; |
| |
| /** Controls whether we should preload resources during zygote init. */ |
| public static final boolean PRELOAD_RESOURCES = true; |
| |
| /** |
| * Registers a server socket for zygote command connections |
| * |
| * @throws RuntimeException when open fails |
| */ |
| private static void registerZygoteSocket(String socketName) { |
| if (sServerSocket == null) { |
| int fileDesc; |
| final String fullSocketName = ANDROID_SOCKET_PREFIX + socketName; |
| try { |
| String env = System.getenv(fullSocketName); |
| fileDesc = Integer.parseInt(env); |
| } catch (RuntimeException ex) { |
| throw new RuntimeException(fullSocketName + " unset or invalid", ex); |
| } |
| |
| try { |
| FileDescriptor fd = new FileDescriptor(); |
| fd.setInt$(fileDesc); |
| sServerSocket = new LocalServerSocket(fd); |
| } catch (IOException ex) { |
| throw new RuntimeException( |
| "Error binding to local socket '" + fileDesc + "'", ex); |
| } |
| } |
| } |
| |
| /** |
| * Waits for and accepts a single command connection. Throws |
| * RuntimeException on failure. |
| */ |
| private static ZygoteConnection acceptCommandPeer(String abiList) { |
| try { |
| return new ZygoteConnection(sServerSocket.accept(), abiList); |
| } catch (IOException ex) { |
| throw new RuntimeException( |
| "IOException during accept()", ex); |
| } |
| } |
| |
| /** |
| * Close and clean up zygote sockets. Called on shutdown and on the |
| * child's exit path. |
| */ |
| static void closeServerSocket() { |
| try { |
| if (sServerSocket != null) { |
| FileDescriptor fd = sServerSocket.getFileDescriptor(); |
| sServerSocket.close(); |
| if (fd != null) { |
| Os.close(fd); |
| } |
| } |
| } catch (IOException ex) { |
| Log.e(TAG, "Zygote: error closing sockets", ex); |
| } catch (ErrnoException ex) { |
| Log.e(TAG, "Zygote: error closing descriptor", ex); |
| } |
| |
| sServerSocket = null; |
| } |
| |
| /** |
| * Return the server socket's underlying file descriptor, so that |
| * ZygoteConnection can pass it to the native code for proper |
| * closure after a child process is forked off. |
| */ |
| |
| static FileDescriptor getServerSocketFileDescriptor() { |
| return sServerSocket.getFileDescriptor(); |
| } |
| |
| private static final int UNPRIVILEGED_UID = 9999; |
| private static final int UNPRIVILEGED_GID = 9999; |
| |
| private static final int ROOT_UID = 0; |
| private static final int ROOT_GID = 0; |
| |
| static void preload() { |
| Log.d(TAG, "begin preload"); |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "BeginIcuCachePinning"); |
| beginIcuCachePinning(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadClasses"); |
| preloadClasses(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadResources"); |
| preloadResources(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadOpenGL"); |
| preloadOpenGL(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| preloadSharedLibraries(); |
| preloadTextResources(); |
| // Ask the WebViewFactory to do any initialization that must run in the zygote process, |
| // for memory sharing purposes. |
| WebViewFactory.prepareWebViewInZygote(); |
| endIcuCachePinning(); |
| warmUpJcaProviders(); |
| Log.d(TAG, "end preload"); |
| } |
| |
| private static void beginIcuCachePinning() { |
| // Pin ICU data in memory from this point that would normally be held by soft references. |
| // Without this, any references created immediately below or during class preloading |
| // would be collected when the Zygote GC runs in gcAndFinalize(). |
| Log.i(TAG, "Installing ICU cache reference pinning..."); |
| |
| CacheValue.setStrength(CacheValue.Strength.STRONG); |
| |
| Log.i(TAG, "Preloading ICU data..."); |
| // Explicitly exercise code to cache data apps are likely to need. |
| ULocale[] localesToPin = { ULocale.ROOT, ULocale.US, ULocale.getDefault() }; |
| for (ULocale uLocale : localesToPin) { |
| new DecimalFormatSymbols(uLocale); |
| } |
| } |
| |
| private static void endIcuCachePinning() { |
| // All cache references created by ICU from this point will be soft. |
| CacheValue.setStrength(CacheValue.Strength.SOFT); |
| |
| Log.i(TAG, "Uninstalled ICU cache reference pinning..."); |
| } |
| |
| private static void preloadSharedLibraries() { |
| Log.i(TAG, "Preloading shared libraries..."); |
| System.loadLibrary("android"); |
| System.loadLibrary("compiler_rt"); |
| System.loadLibrary("jnigraphics"); |
| } |
| |
| private static void preloadOpenGL() { |
| if (!SystemProperties.getBoolean(PROPERTY_DISABLE_OPENGL_PRELOADING, false)) { |
| EGL14.eglGetDisplay(EGL14.EGL_DEFAULT_DISPLAY); |
| } |
| } |
| |
| private static void preloadTextResources() { |
| Hyphenator.init(); |
| TextView.preloadFontCache(); |
| } |
| |
| /** |
| * Register AndroidKeyStoreProvider and warm up the providers that are already registered. |
| * |
| * By doing it here we avoid that each app does it when requesting a service from the |
| * provider for the first time. |
| */ |
| private static void warmUpJcaProviders() { |
| long startTime = SystemClock.uptimeMillis(); |
| Trace.traceBegin( |
| Trace.TRACE_TAG_DALVIK, "Starting installation of AndroidKeyStoreProvider"); |
| // AndroidKeyStoreProvider.install() manipulates the list of JCA providers to insert |
| // preferred providers. Note this is not done via security.properties as the JCA providers |
| // are not on the classpath in the case of, for example, raw dalvikvm runtimes. |
| AndroidKeyStoreProvider.install(); |
| Log.i(TAG, "Installed AndroidKeyStoreProvider in " |
| + (SystemClock.uptimeMillis() - startTime) + "ms."); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| |
| startTime = SystemClock.uptimeMillis(); |
| Trace.traceBegin( |
| Trace.TRACE_TAG_DALVIK, "Starting warm up of JCA providers"); |
| for (Provider p : Security.getProviders()) { |
| p.warmUpServiceProvision(); |
| } |
| Log.i(TAG, "Warmed up JCA providers in " |
| + (SystemClock.uptimeMillis() - startTime) + "ms."); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| } |
| |
| /** |
| * Performs Zygote process initialization. Loads and initializes |
| * commonly used classes. |
| * |
| * Most classes only cause a few hundred bytes to be allocated, but |
| * a few will allocate a dozen Kbytes (in one case, 500+K). |
| */ |
| private static void preloadClasses() { |
| final VMRuntime runtime = VMRuntime.getRuntime(); |
| |
| InputStream is; |
| try { |
| is = new FileInputStream(PRELOADED_CLASSES); |
| } catch (FileNotFoundException e) { |
| Log.e(TAG, "Couldn't find " + PRELOADED_CLASSES + "."); |
| return; |
| } |
| |
| Log.i(TAG, "Preloading classes..."); |
| long startTime = SystemClock.uptimeMillis(); |
| |
| // Drop root perms while running static initializers. |
| final int reuid = Os.getuid(); |
| final int regid = Os.getgid(); |
| |
| // We need to drop root perms only if we're already root. In the case of "wrapped" |
| // processes (see WrapperInit), this function is called from an unprivileged uid |
| // and gid. |
| boolean droppedPriviliges = false; |
| if (reuid == ROOT_UID && regid == ROOT_GID) { |
| try { |
| Os.setregid(ROOT_GID, UNPRIVILEGED_GID); |
| Os.setreuid(ROOT_UID, UNPRIVILEGED_UID); |
| } catch (ErrnoException ex) { |
| throw new RuntimeException("Failed to drop root", ex); |
| } |
| |
| droppedPriviliges = true; |
| } |
| |
| // Alter the target heap utilization. With explicit GCs this |
| // is not likely to have any effect. |
| float defaultUtilization = runtime.getTargetHeapUtilization(); |
| runtime.setTargetHeapUtilization(0.8f); |
| |
| try { |
| BufferedReader br |
| = new BufferedReader(new InputStreamReader(is), 256); |
| |
| int count = 0; |
| String line; |
| while ((line = br.readLine()) != null) { |
| // Skip comments and blank lines. |
| line = line.trim(); |
| if (line.startsWith("#") || line.equals("")) { |
| continue; |
| } |
| |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadClass " + line); |
| try { |
| if (false) { |
| Log.v(TAG, "Preloading " + line + "..."); |
| } |
| // Load and explicitly initialize the given class. Use |
| // Class.forName(String, boolean, ClassLoader) to avoid repeated stack lookups |
| // (to derive the caller's class-loader). Use true to force initialization, and |
| // null for the boot classpath class-loader (could as well cache the |
| // class-loader of this class in a variable). |
| Class.forName(line, true, null); |
| count++; |
| } catch (ClassNotFoundException e) { |
| Log.w(TAG, "Class not found for preloading: " + line); |
| } catch (UnsatisfiedLinkError e) { |
| Log.w(TAG, "Problem preloading " + line + ": " + e); |
| } catch (Throwable t) { |
| Log.e(TAG, "Error preloading " + line + ".", t); |
| if (t instanceof Error) { |
| throw (Error) t; |
| } |
| if (t instanceof RuntimeException) { |
| throw (RuntimeException) t; |
| } |
| throw new RuntimeException(t); |
| } |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| } |
| |
| Log.i(TAG, "...preloaded " + count + " classes in " |
| + (SystemClock.uptimeMillis()-startTime) + "ms."); |
| } catch (IOException e) { |
| Log.e(TAG, "Error reading " + PRELOADED_CLASSES + ".", e); |
| } finally { |
| IoUtils.closeQuietly(is); |
| // Restore default. |
| runtime.setTargetHeapUtilization(defaultUtilization); |
| |
| // Fill in dex caches with classes, fields, and methods brought in by preloading. |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PreloadDexCaches"); |
| runtime.preloadDexCaches(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| |
| // Bring back root. We'll need it later if we're in the zygote. |
| if (droppedPriviliges) { |
| try { |
| Os.setreuid(ROOT_UID, ROOT_UID); |
| Os.setregid(ROOT_GID, ROOT_GID); |
| } catch (ErrnoException ex) { |
| throw new RuntimeException("Failed to restore root", ex); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Load in commonly used resources, so they can be shared across |
| * processes. |
| * |
| * These tend to be a few Kbytes, but are frequently in the 20-40K |
| * range, and occasionally even larger. |
| */ |
| private static void preloadResources() { |
| final VMRuntime runtime = VMRuntime.getRuntime(); |
| |
| try { |
| mResources = Resources.getSystem(); |
| mResources.startPreloading(); |
| if (PRELOAD_RESOURCES) { |
| Log.i(TAG, "Preloading resources..."); |
| |
| long startTime = SystemClock.uptimeMillis(); |
| TypedArray ar = mResources.obtainTypedArray( |
| com.android.internal.R.array.preloaded_drawables); |
| int N = preloadDrawables(ar); |
| ar.recycle(); |
| Log.i(TAG, "...preloaded " + N + " resources in " |
| + (SystemClock.uptimeMillis()-startTime) + "ms."); |
| |
| startTime = SystemClock.uptimeMillis(); |
| ar = mResources.obtainTypedArray( |
| com.android.internal.R.array.preloaded_color_state_lists); |
| N = preloadColorStateLists(ar); |
| ar.recycle(); |
| Log.i(TAG, "...preloaded " + N + " resources in " |
| + (SystemClock.uptimeMillis()-startTime) + "ms."); |
| |
| if (mResources.getBoolean( |
| com.android.internal.R.bool.config_freeformWindowManagement)) { |
| startTime = SystemClock.uptimeMillis(); |
| ar = mResources.obtainTypedArray( |
| com.android.internal.R.array.preloaded_freeform_multi_window_drawables); |
| N = preloadDrawables(ar); |
| ar.recycle(); |
| Log.i(TAG, "...preloaded " + N + " resource in " |
| + (SystemClock.uptimeMillis() - startTime) + "ms."); |
| } |
| } |
| mResources.finishPreloading(); |
| } catch (RuntimeException e) { |
| Log.w(TAG, "Failure preloading resources", e); |
| } |
| } |
| |
| private static int preloadColorStateLists(TypedArray ar) { |
| int N = ar.length(); |
| for (int i=0; i<N; i++) { |
| int id = ar.getResourceId(i, 0); |
| if (false) { |
| Log.v(TAG, "Preloading resource #" + Integer.toHexString(id)); |
| } |
| if (id != 0) { |
| if (mResources.getColorStateList(id, null) == null) { |
| throw new IllegalArgumentException( |
| "Unable to find preloaded color resource #0x" |
| + Integer.toHexString(id) |
| + " (" + ar.getString(i) + ")"); |
| } |
| } |
| } |
| return N; |
| } |
| |
| |
| private static int preloadDrawables(TypedArray ar) { |
| int N = ar.length(); |
| for (int i=0; i<N; i++) { |
| int id = ar.getResourceId(i, 0); |
| if (false) { |
| Log.v(TAG, "Preloading resource #" + Integer.toHexString(id)); |
| } |
| if (id != 0) { |
| if (mResources.getDrawable(id, null) == null) { |
| throw new IllegalArgumentException( |
| "Unable to find preloaded drawable resource #0x" |
| + Integer.toHexString(id) |
| + " (" + ar.getString(i) + ")"); |
| } |
| } |
| } |
| return N; |
| } |
| |
| /** |
| * Runs several special GCs to try to clean up a few generations of |
| * softly- and final-reachable objects, along with any other garbage. |
| * This is only useful just before a fork(). |
| */ |
| /*package*/ static void gcAndFinalize() { |
| final VMRuntime runtime = VMRuntime.getRuntime(); |
| |
| /* runFinalizationSync() lets finalizers be called in Zygote, |
| * which doesn't have a HeapWorker thread. |
| */ |
| System.gc(); |
| runtime.runFinalizationSync(); |
| System.gc(); |
| } |
| |
| /** |
| * Finish remaining work for the newly forked system server process. |
| */ |
| private static void handleSystemServerProcess( |
| ZygoteConnection.Arguments parsedArgs) |
| throws ZygoteInit.MethodAndArgsCaller { |
| |
| closeServerSocket(); |
| |
| // set umask to 0077 so new files and directories will default to owner-only permissions. |
| Os.umask(S_IRWXG | S_IRWXO); |
| |
| if (parsedArgs.niceName != null) { |
| Process.setArgV0(parsedArgs.niceName); |
| } |
| |
| final String systemServerClasspath = Os.getenv("SYSTEMSERVERCLASSPATH"); |
| if (systemServerClasspath != null) { |
| performSystemServerDexOpt(systemServerClasspath); |
| } |
| |
| if (parsedArgs.invokeWith != null) { |
| String[] args = parsedArgs.remainingArgs; |
| // If we have a non-null system server class path, we'll have to duplicate the |
| // existing arguments and append the classpath to it. ART will handle the classpath |
| // correctly when we exec a new process. |
| if (systemServerClasspath != null) { |
| String[] amendedArgs = new String[args.length + 2]; |
| amendedArgs[0] = "-cp"; |
| amendedArgs[1] = systemServerClasspath; |
| System.arraycopy(parsedArgs.remainingArgs, 0, amendedArgs, 2, parsedArgs.remainingArgs.length); |
| } |
| |
| WrapperInit.execApplication(parsedArgs.invokeWith, |
| parsedArgs.niceName, parsedArgs.targetSdkVersion, |
| VMRuntime.getCurrentInstructionSet(), null, args); |
| } else { |
| ClassLoader cl = null; |
| if (systemServerClasspath != null) { |
| cl = createSystemServerClassLoader(systemServerClasspath, |
| parsedArgs.targetSdkVersion); |
| |
| Thread.currentThread().setContextClassLoader(cl); |
| } |
| |
| /* |
| * Pass the remaining arguments to SystemServer. |
| */ |
| RuntimeInit.zygoteInit(parsedArgs.targetSdkVersion, parsedArgs.remainingArgs, cl); |
| } |
| |
| /* should never reach here */ |
| } |
| |
| /** |
| * Creates a PathClassLoader for the system server. It also creates |
| * a shared namespace associated with the classloader to let it access |
| * platform-private native libraries. |
| */ |
| private static PathClassLoader createSystemServerClassLoader(String systemServerClasspath, |
| int targetSdkVersion) { |
| String librarySearchPath = System.getProperty("java.library.path"); |
| |
| return PathClassLoaderFactory.createClassLoader(systemServerClasspath, |
| librarySearchPath, |
| null /* libraryPermittedPath */, |
| ClassLoader.getSystemClassLoader(), |
| targetSdkVersion, |
| true /* isNamespaceShared */); |
| } |
| |
| /** |
| * Performs dex-opt on the elements of {@code classPath}, if needed. We |
| * choose the instruction set of the current runtime. |
| */ |
| private static void performSystemServerDexOpt(String classPath) { |
| final String[] classPathElements = classPath.split(":"); |
| final InstallerConnection installer = new InstallerConnection(); |
| installer.waitForConnection(); |
| final String instructionSet = VMRuntime.getRuntime().vmInstructionSet(); |
| |
| try { |
| String sharedLibraries = ""; |
| for (String classPathElement : classPathElements) { |
| // System server is fully AOTed and never profiled |
| // for profile guided compilation. |
| // TODO: Make this configurable between INTERPRET_ONLY, SPEED, SPACE and EVERYTHING? |
| |
| int dexoptNeeded; |
| try { |
| dexoptNeeded = DexFile.getDexOptNeeded( |
| classPathElement, instructionSet, "speed", |
| false /* newProfile */); |
| } catch (FileNotFoundException ignored) { |
| // Do not add to the classpath. |
| Log.w(TAG, "Missing classpath element for system server: " + classPathElement); |
| continue; |
| } catch (IOException e) { |
| // Not fully clear what to do here as we don't know the cause of the |
| // IO exception. Add to the classpath to be conservative, but don't |
| // attempt to compile it. |
| Log.w(TAG, "Error checking classpath element for system server: " |
| + classPathElement, e); |
| dexoptNeeded = DexFile.NO_DEXOPT_NEEDED; |
| } |
| |
| if (dexoptNeeded != DexFile.NO_DEXOPT_NEEDED) { |
| try { |
| installer.dexopt(classPathElement, Process.SYSTEM_UID, instructionSet, |
| dexoptNeeded, 0 /*dexFlags*/, "speed", null /*volumeUuid*/, |
| sharedLibraries); |
| } catch (InstallerException e) { |
| // Ignore (but log), we need this on the classpath for fallback mode. |
| Log.w(TAG, "Failed compiling classpath element for system server: " |
| + classPathElement, e); |
| } |
| } |
| |
| if (!sharedLibraries.isEmpty()) { |
| sharedLibraries += ":"; |
| } |
| sharedLibraries += classPathElement; |
| } |
| } finally { |
| installer.disconnect(); |
| } |
| } |
| |
| /** |
| * Prepare the arguments and fork for the system server process. |
| */ |
| private static boolean startSystemServer(String abiList, String socketName) |
| throws MethodAndArgsCaller, RuntimeException { |
| long capabilities = posixCapabilitiesAsBits( |
| OsConstants.CAP_IPC_LOCK, |
| OsConstants.CAP_KILL, |
| OsConstants.CAP_NET_ADMIN, |
| OsConstants.CAP_NET_BIND_SERVICE, |
| OsConstants.CAP_NET_BROADCAST, |
| OsConstants.CAP_NET_RAW, |
| OsConstants.CAP_SYS_MODULE, |
| OsConstants.CAP_SYS_NICE, |
| OsConstants.CAP_SYS_PTRACE, |
| OsConstants.CAP_SYS_RESOURCE, |
| OsConstants.CAP_SYS_TIME, |
| OsConstants.CAP_SYS_TTY_CONFIG |
| ); |
| /* Containers run without this capability, so avoid setting it in that case */ |
| if (!SystemProperties.getBoolean(PROPERTY_RUNNING_IN_CONTAINER, false)) { |
| capabilities |= posixCapabilitiesAsBits(OsConstants.CAP_BLOCK_SUSPEND); |
| } |
| /* Hardcoded command line to start the system server */ |
| String args[] = { |
| "--setuid=1000", |
| "--setgid=1000", |
| "--setgroups=1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1018,1021,1032,3001,3002,3003,3006,3007,3009,3010", |
| "--capabilities=" + capabilities + "," + capabilities, |
| "--nice-name=system_server", |
| "--runtime-args", |
| "com.android.server.SystemServer", |
| }; |
| ZygoteConnection.Arguments parsedArgs = null; |
| |
| int pid; |
| |
| try { |
| parsedArgs = new ZygoteConnection.Arguments(args); |
| ZygoteConnection.applyDebuggerSystemProperty(parsedArgs); |
| ZygoteConnection.applyInvokeWithSystemProperty(parsedArgs); |
| |
| /* Request to fork the system server process */ |
| pid = Zygote.forkSystemServer( |
| parsedArgs.uid, parsedArgs.gid, |
| parsedArgs.gids, |
| parsedArgs.debugFlags, |
| null, |
| parsedArgs.permittedCapabilities, |
| parsedArgs.effectiveCapabilities); |
| } catch (IllegalArgumentException ex) { |
| throw new RuntimeException(ex); |
| } |
| |
| /* For child process */ |
| if (pid == 0) { |
| if (hasSecondZygote(abiList)) { |
| waitForSecondaryZygote(socketName); |
| } |
| |
| handleSystemServerProcess(parsedArgs); |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Gets the bit array representation of the provided list of POSIX capabilities. |
| */ |
| private static long posixCapabilitiesAsBits(int... capabilities) { |
| long result = 0; |
| for (int capability : capabilities) { |
| if ((capability < 0) || (capability > OsConstants.CAP_LAST_CAP)) { |
| throw new IllegalArgumentException(String.valueOf(capability)); |
| } |
| result |= (1L << capability); |
| } |
| return result; |
| } |
| |
| public static void main(String argv[]) { |
| // Mark zygote start. This ensures that thread creation will throw |
| // an error. |
| ZygoteHooks.startZygoteNoThreadCreation(); |
| |
| try { |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "ZygoteInit"); |
| RuntimeInit.enableDdms(); |
| // Start profiling the zygote initialization. |
| SamplingProfilerIntegration.start(); |
| |
| boolean startSystemServer = false; |
| String socketName = "zygote"; |
| String abiList = null; |
| for (int i = 1; i < argv.length; i++) { |
| if ("start-system-server".equals(argv[i])) { |
| startSystemServer = true; |
| } else if (argv[i].startsWith(ABI_LIST_ARG)) { |
| abiList = argv[i].substring(ABI_LIST_ARG.length()); |
| } else if (argv[i].startsWith(SOCKET_NAME_ARG)) { |
| socketName = argv[i].substring(SOCKET_NAME_ARG.length()); |
| } else { |
| throw new RuntimeException("Unknown command line argument: " + argv[i]); |
| } |
| } |
| |
| if (abiList == null) { |
| throw new RuntimeException("No ABI list supplied."); |
| } |
| |
| registerZygoteSocket(socketName); |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "ZygotePreload"); |
| EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_START, |
| SystemClock.uptimeMillis()); |
| preload(); |
| EventLog.writeEvent(LOG_BOOT_PROGRESS_PRELOAD_END, |
| SystemClock.uptimeMillis()); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| |
| // Finish profiling the zygote initialization. |
| SamplingProfilerIntegration.writeZygoteSnapshot(); |
| |
| // Do an initial gc to clean up after startup |
| Trace.traceBegin(Trace.TRACE_TAG_DALVIK, "PostZygoteInitGC"); |
| gcAndFinalize(); |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| |
| Trace.traceEnd(Trace.TRACE_TAG_DALVIK); |
| |
| // Disable tracing so that forked processes do not inherit stale tracing tags from |
| // Zygote. |
| Trace.setTracingEnabled(false); |
| |
| // Zygote process unmounts root storage spaces. |
| Zygote.nativeUnmountStorageOnInit(); |
| |
| ZygoteHooks.stopZygoteNoThreadCreation(); |
| |
| if (startSystemServer) { |
| startSystemServer(abiList, socketName); |
| } |
| |
| Log.i(TAG, "Accepting command socket connections"); |
| runSelectLoop(abiList); |
| |
| closeServerSocket(); |
| } catch (MethodAndArgsCaller caller) { |
| caller.run(); |
| } catch (Throwable ex) { |
| Log.e(TAG, "Zygote died with exception", ex); |
| closeServerSocket(); |
| throw ex; |
| } |
| } |
| |
| /** |
| * Return {@code true} if this device configuration has another zygote. |
| * |
| * We determine this by comparing the device ABI list with this zygotes |
| * list. If this zygote supports all ABIs this device supports, there won't |
| * be another zygote. |
| */ |
| private static boolean hasSecondZygote(String abiList) { |
| return !SystemProperties.get("ro.product.cpu.abilist").equals(abiList); |
| } |
| |
| private static void waitForSecondaryZygote(String socketName) { |
| String otherZygoteName = Process.ZYGOTE_SOCKET.equals(socketName) ? |
| Process.SECONDARY_ZYGOTE_SOCKET : Process.ZYGOTE_SOCKET; |
| while (true) { |
| try { |
| final Process.ZygoteState zs = Process.ZygoteState.connect(otherZygoteName); |
| zs.close(); |
| break; |
| } catch (IOException ioe) { |
| Log.w(TAG, "Got error connecting to zygote, retrying. msg= " + ioe.getMessage()); |
| } |
| |
| try { |
| Thread.sleep(1000); |
| } catch (InterruptedException ie) { |
| } |
| } |
| } |
| |
| /** |
| * Runs the zygote process's select loop. Accepts new connections as |
| * they happen, and reads commands from connections one spawn-request's |
| * worth at a time. |
| * |
| * @throws MethodAndArgsCaller in a child process when a main() should |
| * be executed. |
| */ |
| private static void runSelectLoop(String abiList) throws MethodAndArgsCaller { |
| ArrayList<FileDescriptor> fds = new ArrayList<FileDescriptor>(); |
| ArrayList<ZygoteConnection> peers = new ArrayList<ZygoteConnection>(); |
| |
| fds.add(sServerSocket.getFileDescriptor()); |
| peers.add(null); |
| |
| while (true) { |
| StructPollfd[] pollFds = new StructPollfd[fds.size()]; |
| for (int i = 0; i < pollFds.length; ++i) { |
| pollFds[i] = new StructPollfd(); |
| pollFds[i].fd = fds.get(i); |
| pollFds[i].events = (short) POLLIN; |
| } |
| try { |
| Os.poll(pollFds, -1); |
| } catch (ErrnoException ex) { |
| throw new RuntimeException("poll failed", ex); |
| } |
| for (int i = pollFds.length - 1; i >= 0; --i) { |
| if ((pollFds[i].revents & POLLIN) == 0) { |
| continue; |
| } |
| if (i == 0) { |
| ZygoteConnection newPeer = acceptCommandPeer(abiList); |
| peers.add(newPeer); |
| fds.add(newPeer.getFileDesciptor()); |
| } else { |
| boolean done = peers.get(i).runOnce(); |
| if (done) { |
| peers.remove(i); |
| fds.remove(i); |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Class not instantiable. |
| */ |
| private ZygoteInit() { |
| } |
| |
| /** |
| * Helper exception class which holds a method and arguments and |
| * can call them. This is used as part of a trampoline to get rid of |
| * the initial process setup stack frames. |
| */ |
| public static class MethodAndArgsCaller extends Exception |
| implements Runnable { |
| /** method to call */ |
| private final Method mMethod; |
| |
| /** argument array */ |
| private final String[] mArgs; |
| |
| public MethodAndArgsCaller(Method method, String[] args) { |
| mMethod = method; |
| mArgs = args; |
| } |
| |
| public void run() { |
| try { |
| mMethod.invoke(null, new Object[] { mArgs }); |
| } catch (IllegalAccessException ex) { |
| throw new RuntimeException(ex); |
| } catch (InvocationTargetException ex) { |
| Throwable cause = ex.getCause(); |
| if (cause instanceof RuntimeException) { |
| throw (RuntimeException) cause; |
| } else if (cause instanceof Error) { |
| throw (Error) cause; |
| } |
| throw new RuntimeException(ex); |
| } |
| } |
| } |
| } |
