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src/main/java/com/github/shadowsocks/Exec.java

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+/*
+ * 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.github.shadowsocks;
+
+import java.io.FileDescriptor;
+
+/**
+ * Utility methods for creating and managing a subprocess.
+ * <p/>
+ * Note: The native methods access a package-private java.io.FileDescriptor
+ * field to get and set the raw Linux file descriptor. This might break if the
+ * implementation of java.io.FileDescriptor is changed.
+ */
+
+public class Exec {
+  static {
+    java.lang.System.loadLibrary("exec");
+  }
+
+  /** Close a given file descriptor. */
+  public static native void close(FileDescriptor fd);
+
+  /**
+   * Create a subprocess. Differs from java.lang.ProcessBuilder in that a pty
+   * is used to communicate with the subprocess.
+   * <p/>
+   * Callers are responsible for calling Exec.close() on the returned file
+   * descriptor.
+   *
+   * @param rdt Whether redirect stdout and stderr
+   * @param cmd The command to execute.
+   * @param args An array of arguments to the command.
+   * @param envVars An array of strings of the form "VAR=value" to be added to the
+   * environment of the process.
+   * @param scripts The scripts to execute.
+   * @param processId A one-element array to which the process ID of the started
+   * process will be written.
+   * @return File descriptor
+   */
+  public static native FileDescriptor createSubprocess(int rdt, String cmd, String[] args,
+      String[] envVars, String scripts, int[] processId);
+
+  /** Send SIGHUP to a process group. */
+  public static native void hangupProcessGroup(int processId);
+
+  /**
+   * Causes the calling thread to wait for the process associated with the
+   * receiver to finish executing.
+   *
+   * @return The exit value of the Process being waited on
+   */
+  public static native int waitFor(int processId);
+}