Util/SafeProcess.cs

   1 //
   2 // SafeProcess.cs
   3 //
   4 // Copyright (C) 2006 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a copy
   9 // of this software and associated documentation files (the "Software"), to deal
  10 // in the Software without restriction, including without limitation the rights
  11 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12 // copies of the Software, and to permit persons to whom the Software is
  13 // furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in all
  16 // copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24 // SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.IO;
  29 using System.Runtime.InteropServices;
  30 using Mono.Unix;
  31 using GLib;
  32
  33 namespace Beagle.Util {
  34
  35         public class SafeProcess {
  36
  37                 private bool redirect_stdin, redirect_stdout, redirect_stderr;
  38                 private string[] args;
  39                 private UnixStream stdin_stream, stdout_stream, stderr_stream;
  40                 private int pid;
  41
  42                 public string[] Arguments {
  43                         get { return args; }
  44                         set { args = value; }
  45                 }
  46
  47                 public bool RedirectStandardInput {
  48                         get { return redirect_stdin; }
  49                         set { redirect_stdin = value; }
  50                 }
  51
  52                 public bool RedirectStandardOutput {
  53                         get { return redirect_stdout; }
  54                         set { redirect_stdout = value; }
  55                 }
  56
  57                 public bool RedirectStandardError {
  58                         get { return redirect_stderr; }
  59                         set { redirect_stderr = value; }
  60                 }
  61
  62                 public Stream StandardInput {
  63                         get { return stdin_stream; }
  64                 }
  65
  66                 public Stream StandardOutput {
  67                         get { return stdout_stream; }
  68                 }
  69
  70                 public Stream StandardError {
  71                         get { return stderr_stream; }
  72                 }
  73
  74                 public int Id {
  75                         get { return pid; }
  76                 }
  77
  78                 [DllImport ("libglib-2.0.so.0")]
  79                 static extern bool g_spawn_async_with_pipes (string working_directory,
  80                                                              string[] argv,
  81                                                              string[] envp,
  82                                                              int flags,
  83                                                              IntPtr child_setup,
  84                                                              IntPtr child_data,
  85                                                              out int pid,
  86                                                              [In,Out] IntPtr standard_input,
  87                                                              [In,Out] IntPtr standard_output,
  88                                                              [In,Out] IntPtr standard_error,
  89                                                              out IntPtr error);
  90
  91                 public void Start ()
  92                 {
  93                         if (args == null)
  94                                 throw new ArgumentException ("Arguments cannot be empty");
  95
  96                         IntPtr error;
  97
  98                         if (args [args.Length - 1] != null) {
  99                                 // Need to null-terminate the array.
 100                                 string[] tmp_args = new string [args.Length + 1];
 101                                 Array.Copy (args, tmp_args, args.Length);
 102                                 args = tmp_args;
 103                         }
 104
 105                         IntPtr in_ptr = IntPtr.Zero, out_ptr = IntPtr.Zero, err_ptr = IntPtr.Zero;
 106
 107                         try {
 108                                 if (RedirectStandardInput)
 109                                         in_ptr = Marshal.AllocHGlobal (IntPtr.Size);
 110
 111                                 if (RedirectStandardOutput)
 112                                         out_ptr = Marshal.AllocHGlobal (IntPtr.Size);
 113
 114                                 if (RedirectStandardError)
 115                                         err_ptr = Marshal.AllocHGlobal (IntPtr.Size);
 116
 117                                 g_spawn_async_with_pipes (null, args, null,
 118                                                           1 << 2, // G_SPAWN_SEARCH_PATH
 119                                                           IntPtr.Zero, IntPtr.Zero, out pid,
 120                                                           in_ptr, out_ptr, err_ptr, out error);
 121
 122                                 if (error != IntPtr.Zero)
 123                                         throw new SafeProcessException (new GException (error));
 124
 125                                 if (in_ptr != IntPtr.Zero) {
 126                                         IntPtr v = Marshal.ReadIntPtr (in_ptr);
 127                                         stdin_stream = new UnixStream ((int) v);
 128                                 }
 129
 130                                 if (out_ptr != IntPtr.Zero) {
 131                                         IntPtr v = Marshal.ReadIntPtr (out_ptr);
 132                                         stdout_stream = new UnixStream ((int) v);
 133                                 }
 134
 135                                 if (err_ptr != IntPtr.Zero) {
 136                                         IntPtr v = Marshal.ReadIntPtr (err_ptr);
 137                                         stderr_stream = new UnixStream ((int) v);
 138                                 }
 139
 140                         } finally {
 141                                 if (in_ptr != IntPtr.Zero)
 142                                         Marshal.FreeHGlobal (in_ptr);
 143
 144                                 if (out_ptr != IntPtr.Zero)
 145                                         Marshal.FreeHGlobal (out_ptr);
 146
 147                                 if (err_ptr != IntPtr.Zero)
 148                                         Marshal.FreeHGlobal (err_ptr);
 149                         }
 150                 }
 151
 152                 public void Close ()
 153                 {
 154                         if (stdin_stream != null)
 155                                 stdin_stream.Close ();
 156
 157                         if (stdout_stream != null)
 158                                 stdout_stream.Close ();
 159
 160                         if (stderr_stream != null)
 161                                 stderr_stream.Close ();
 162                 }
 163         }
 164
 165         public class SafeProcessException : Exception {
 166
 167                 internal SafeProcessException (GException gexception) : base (gexception.Message) { }
 168         }
 169
 170 }