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 int stdin, stdout, stderr;
  39                 private string[] args;
  40                 private UnixStream stdin_stream, stdout_stream, stderr_stream;
  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                 [DllImport ("libglib-2.0.so.0")]
  75                 static extern bool g_spawn_async_with_pipes (string working_directory,
  76                                                              string[] argv,
  77                                                              string[] envp,
  78                                                              int flags,
  79                                                              IntPtr child_setup,
  80                                                              IntPtr child_data,
  81                                                              IntPtr pid,
  82                                                              ref int standard_input,
  83                                                              ref int standard_output,
  84                                                              ref int standard_error,
  85                                                              out IntPtr error);
  86
  87                 public void Start ()
  88                 {
  89                         if (args == null)
  90                                 throw new ArgumentException ("Arguments cannot be empty");
  91
  92                         IntPtr error;
  93
  94                         if (args [args.Length - 1] != null) {
  95                                 // Need to null-terminate the array.
  96                                 string[] tmp_args = new string [args.Length + 1];
  97                                 Array.Copy (args, tmp_args, args.Length);
  98                                 args = tmp_args;
  99                         }
 100
 101                         g_spawn_async_with_pipes (null, args, null,
 102                                                   1 << 2, // G_SPAWN_SEARCH_PATH
 103                                                   IntPtr.Zero, IntPtr.Zero, IntPtr.Zero,
 104                                                   ref stdin, ref stdout, ref stderr, out error);
 105
 106                         if (error != IntPtr.Zero)
 107                                 throw new SafeProcessException (new GException (error));
 108
 109                         if (! RedirectStandardInput)
 110                                 Mono.Unix.Native.Syscall.close (stdin);
 111                         else
 112                                 stdin_stream = new UnixStream (stdin);
 113
 114                         if (! RedirectStandardOutput)
 115                                 Mono.Unix.Native.Syscall.close (stdout);
 116                         else
 117                                 stdout_stream = new UnixStream (stdout);
 118
 119                         if (! RedirectStandardError)
 120                                 Mono.Unix.Native.Syscall.close (stderr);
 121                         else
 122                                 stderr_stream = new UnixStream (stderr);
 123                 }
 124
 125                 public void Close ()
 126                 {
 127                         if (stdin_stream != null)
 128                                 stdin_stream.Close ();
 129
 130                         if (stdout_stream != null)
 131                                 stdout_stream.Close ();
 132
 133                         if (stderr_stream != null)
 134                                 stderr_stream.Close ();
 135                 }
 136         }
 137
 138         public class SafeProcessException : Exception {
 139
 140                 internal SafeProcessException (GException gexception) : base (gexception.Message) { }
 141         }
 142
 143 }