diff --git a/core/java/com/android/internal/os/Zygote.java b/core/java/com/android/internal/os/Zygote.java
new file mode 100644
index 0000000..c5fa0a1
--- /dev/null
+++ b/core/java/com/android/internal/os/Zygote.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright (C) 2014 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 dalvik.system.ZygoteHooks;
+import libcore.io.ErrnoException;
+import libcore.io.Libcore;
+
+/** @hide */
+public final class Zygote {
+    /*
+    * Bit values for "debugFlags" argument.  The definitions are duplicated
+    * in the native code.
+    */
+
+    /** enable debugging over JDWP */
+    public static final int DEBUG_ENABLE_DEBUGGER   = 1;
+    /** enable JNI checks */
+    public static final int DEBUG_ENABLE_CHECKJNI   = 1 << 1;
+    /** enable Java programming language "assert" statements */
+    public static final int DEBUG_ENABLE_ASSERT     = 1 << 2;
+    /** disable the JIT compiler */
+    public static final int DEBUG_ENABLE_SAFEMODE   = 1 << 3;
+    /** Enable logging of third-party JNI activity. */
+    public static final int DEBUG_ENABLE_JNI_LOGGING = 1 << 4;
+
+    /** No external storage should be mounted. */
+    public static final int MOUNT_EXTERNAL_NONE = 0;
+    /** Single-user external storage should be mounted. */
+    public static final int MOUNT_EXTERNAL_SINGLEUSER = 1;
+    /** Multi-user external storage should be mounted. */
+    public static final int MOUNT_EXTERNAL_MULTIUSER = 2;
+    /** All multi-user external storage should be mounted. */
+    public static final int MOUNT_EXTERNAL_MULTIUSER_ALL = 3;
+
+    private static final ZygoteHooks VM_HOOKS = new ZygoteHooks();
+
+    private Zygote() {}
+
+    /**
+     * Forks a new VM instance.  The current VM must have been started
+     * with the -Xzygote flag. <b>NOTE: new instance keeps all
+     * root capabilities. The new process is expected to call capset()</b>.
+     *
+     * @param uid the UNIX uid that the new process should setuid() to after
+     * fork()ing and and before spawning any threads.
+     * @param gid the UNIX gid that the new process should setgid() to after
+     * fork()ing and and before spawning any threads.
+     * @param gids null-ok; a list of UNIX gids that the new process should
+     * setgroups() to after fork and before spawning any threads.
+     * @param debugFlags bit flags that enable debugging features.
+     * @param rlimits null-ok an array of rlimit tuples, with the second
+     * dimension having a length of 3 and representing
+     * (resource, rlim_cur, rlim_max). These are set via the posix
+     * setrlimit(2) call.
+     * @param seInfo null-ok a string specifying SELinux information for
+     * the new process.
+     * @param niceName null-ok a string specifying the process name.
+     * @param fdsToClose an array of ints, holding one or more POSIX
+     * file descriptor numbers that are to be closed by the child
+     * (and replaced by /dev/null) after forking.  An integer value
+     * of -1 in any entry in the array means "ignore this one".
+     *
+     * @return 0 if this is the child, pid of the child
+     * if this is the parent, or -1 on error.
+     */
+    public static int forkAndSpecialize(int uid, int gid, int[] gids, int debugFlags,
+          int[][] rlimits, int mountExternal, String seInfo, String niceName, int[] fdsToClose) {
+        VM_HOOKS.preFork();
+        int pid = nativeForkAndSpecialize(
+                  uid, gid, gids, debugFlags, rlimits, mountExternal, seInfo, niceName, fdsToClose);
+        VM_HOOKS.postForkCommon();
+        return pid;
+    }
+
+    native private static int nativeForkAndSpecialize(int uid, int gid, int[] gids,int debugFlags,
+          int[][] rlimits, int mountExternal, String seInfo, String niceName, int[] fdsToClose);
+
+    /**
+     * Special method to start the system server process. In addition to the
+     * common actions performed in forkAndSpecialize, the pid of the child
+     * process is recorded such that the death of the child process will cause
+     * zygote to exit.
+     *
+     * @param uid the UNIX uid that the new process should setuid() to after
+     * fork()ing and and before spawning any threads.
+     * @param gid the UNIX gid that the new process should setgid() to after
+     * fork()ing and and before spawning any threads.
+     * @param gids null-ok; a list of UNIX gids that the new process should
+     * setgroups() to after fork and before spawning any threads.
+     * @param debugFlags bit flags that enable debugging features.
+     * @param rlimits null-ok an array of rlimit tuples, with the second
+     * dimension having a length of 3 and representing
+     * (resource, rlim_cur, rlim_max). These are set via the posix
+     * setrlimit(2) call.
+     * @param permittedCapabilities argument for setcap()
+     * @param effectiveCapabilities argument for setcap()
+     *
+     * @return 0 if this is the child, pid of the child
+     * if this is the parent, or -1 on error.
+     */
+    public static int forkSystemServer(int uid, int gid, int[] gids, int debugFlags,
+            int[][] rlimits, long permittedCapabilities, long effectiveCapabilities) {
+        VM_HOOKS.preFork();
+        int pid = nativeForkSystemServer(
+                uid, gid, gids, debugFlags, rlimits, permittedCapabilities, effectiveCapabilities);
+        VM_HOOKS.postForkCommon();
+        return pid;
+    }
+
+    native private static int nativeForkSystemServer(int uid, int gid, int[] gids, int debugFlags,
+            int[][] rlimits, long permittedCapabilities, long effectiveCapabilities);
+
+    private static void callPostForkChildHooks(int debugFlags) {
+        VM_HOOKS.postForkChild(debugFlags);
+    }
+
+
+    /**
+     * Executes "/system/bin/sh -c &lt;command&gt;" using the exec() system call.
+     * This method throws a runtime exception if exec() failed, otherwise, this
+     * method never returns.
+     *
+     * @param command The shell command to execute.
+     */
+    public static void execShell(String command) {
+        String[] args = { "/system/bin/sh", "-c", command };
+        try {
+            Libcore.os.execv(args[0], args);
+        } catch (ErrnoException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Appends quotes shell arguments to the specified string builder.
+     * The arguments are quoted using single-quotes, escaped if necessary,
+     * prefixed with a space, and appended to the command.
+     *
+     * @param command A string builder for the shell command being constructed.
+     * @param args An array of argument strings to be quoted and appended to the command.
+     * @see #execShell(String)
+     */
+    public static void appendQuotedShellArgs(StringBuilder command, String[] args) {
+        for (String arg : args) {
+            command.append(" '").append(arg.replace("'", "'\\''")).append("'");
+        }
+    }
+}