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
  41                 public string[] Arguments {
  42                         get { return args; }
  43                         set { args = value; }
  44                 }
  45
  46                 public bool RedirectStandardInput {
  47                         get { return redirect_stdin; }
  48                         set { redirect_stdin = value; }
  49                 }
  50
  51                 public bool RedirectStandardOutput {
  52                         get { return redirect_stdout; }
  53                         set { redirect_stdout = value; }
  54                 }
  55
  56                 public bool RedirectStandardError {
  57                         get { return redirect_stderr; }
  58                         set { redirect_stderr = value; }
  59                 }
  60
  61                 public Stream StandardInput {
  62                         get { return stdin_stream; }
  63                 }
  64
  65                 public Stream StandardOutput {
  66                         get { return stdout_stream; }
  67                 }
  68
  69                 public Stream StandardError {
  70                         get { return stderr_stream; }
  71                 }
  72
  73                 [DllImport ("libglib-2.0.so.0")]
  74                 static extern bool g_spawn_async_with_pipes (string working_directory,
  75                                                              string[] argv,
  76                                                              string[] envp,
  77                                                              int flags,
  78                                                              IntPtr child_setup,
  79                                                              IntPtr child_data,
  80                                                              IntPtr pid,
  81                                                              [In,Out] IntPtr standard_input,
  82                                                              [In,Out] IntPtr standard_output,
  83                                                              [In,Out] IntPtr standard_error,
  84                                                              out IntPtr error);
  85
  86                 public void Start ()
  87                 {
  88                         if (args == null)
  89                                 throw new ArgumentException ("Arguments cannot be empty");
  90
  91                         IntPtr error;
  92
  93                         if (args [args.Length - 1] != null) {
  94                                 // Need to null-terminate the array.
  95                                 string[] tmp_args = new string [args.Length + 1];
  96                                 Array.Copy (args, tmp_args, args.Length);
  97                                 args = tmp_args;
  98                         }
  99
 100                         IntPtr in_ptr = IntPtr.Zero, out_ptr = IntPtr.Zero, err_ptr = IntPtr.Zero;
 101
 102                         try {
 103                                 if (RedirectStandardInput)
 104                                         in_ptr = Marshal.AllocHGlobal (IntPtr.Size);
 105
 106                                 if (RedirectStandardOutput)
 107                                         out_ptr = Marshal.AllocHGlobal (IntPtr.Size);
 108
 109                                 if (RedirectStandardError)
 110                                         err_ptr = Marshal.AllocHGlobal (IntPtr.Size);
 111
 112                                 g_spawn_async_with_pipes (null, args, null,
 113                                                           1 << 2, // G_SPAWN_SEARCH_PATH
 114                                                           IntPtr.Zero, IntPtr.Zero, IntPtr.Zero,
 115                                                           in_ptr, out_ptr, err_ptr, out error);
 116
 117                                 if (error != IntPtr.Zero)
 118                                         throw new SafeProcessException (new GException (error));
 119
 120                                 if (in_ptr != IntPtr.Zero) {
 121                                         IntPtr v = Marshal.ReadIntPtr (in_ptr);
 122                                         stdin_stream = new UnixStream ((int) v);
 123                                 }
 124
 125                                 if (out_ptr != IntPtr.Zero) {
 126                                         IntPtr v = Marshal.ReadIntPtr (out_ptr);
 127                                         stdout_stream = new UnixStream ((int) v);
 128                                 }
 129
 130                                 if (err_ptr != IntPtr.Zero) {
 131                                         IntPtr v = Marshal.ReadIntPtr (err_ptr);
 132                                         stderr_stream = new UnixStream ((int) v);
 133                                 }
 134
 135                         } finally {
 136                                 if (in_ptr != IntPtr.Zero)
 137                                         Marshal.FreeHGlobal (in_ptr);
 138
 139                                 if (out_ptr != IntPtr.Zero)
 140                                         Marshal.FreeHGlobal (out_ptr);
 141
 142                                 if (err_ptr != IntPtr.Zero)
 143                                         Marshal.FreeHGlobal (err_ptr);
 144                         }
 145                 }
 146
 147                 public void Close ()
 148                 {
 149                         if (stdin_stream != null)
 150                                 stdin_stream.Close ();
 151
 152                         if (stdout_stream != null)
 153                                 stdout_stream.Close ();
 154
 155                         if (stderr_stream != null)
 156                                 stderr_stream.Close ();
 157                 }
 158         }
 159
 160         public class SafeProcessException : Exception {
 161
 162                 internal SafeProcessException (GException gexception) : base (gexception.Message) { }
 163         }
 164
 165 }