mcs/class/Mono.Posix/Mono.Unix/UnixSignal.cs

   1 //
   2 // Mono.Unix/UnixSignal.cs
   3 //
   4 // Authors:
   5 //   Jonathan Pryor (jpryor@novell.com)
   6 //
   7 // (C) 2008 Novell, Inc.
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Runtime.InteropServices;
  31 using System.Threading;
  32
  33 using Mono.Unix.Native;
  34
  35 namespace Mono.Unix {
  36         public class UnixSignal : WaitHandle {
  37                 private Signum signum;
  38                 private IntPtr signal_info;
  39
  40                 public UnixSignal (Signum signum)
  41                 {
  42                         this.signum = signum;
  43                         // ensure signum is a valid signal
  44                         int _signum = NativeConvert.FromSignum (signum);
  45                         this.signal_info = install (_signum);
  46                         if (this.signal_info == IntPtr.Zero) {
  47                                 throw new ArgumentException ("Unable to handle signal", "signum");
  48                         }
  49                 }
  50
  51                 public Signum Signum {
  52                         get {
  53                                 AssertValid ();
  54                                 return signum;
  55                         }
  56                 }
  57
  58                 [DllImport (Stdlib.MPH, CallingConvention=CallingConvention.Cdecl,
  59                                 EntryPoint="Mono_Unix_UnixSignal_install")]
  60                 private static extern IntPtr install (int signum);
  61
  62                 [DllImport (Stdlib.MPH, CallingConvention=CallingConvention.Cdecl,
  63                                 EntryPoint="Mono_Unix_UnixSignal_uninstall")]
  64                 private static extern int uninstall (IntPtr info);
  65
  66                 [DllImport (Stdlib.MPH, CallingConvention=CallingConvention.Cdecl,
  67                                 EntryPoint="Mono_Unix_UnixSignal_WaitAny")]
  68                 private static extern int WaitAny (IntPtr[] infos, int count, int timeout);
  69
  70                 private void AssertValid ()
  71                 {
  72                         if (signal_info == IntPtr.Zero)
  73                                 throw new ObjectDisposedException (GetType().FullName);
  74                 }
  75
  76                 private unsafe SignalInfo* Info {
  77                         get {
  78                                 AssertValid ();
  79                                 return (SignalInfo*) signal_info;
  80                         }
  81                 }
  82
  83                 public bool IsSet {
  84                         get {
  85                                 return Count > 0;
  86                         }
  87                 }
  88
  89                 public unsafe bool Reset ()
  90                 {
  91                         int n = Interlocked.Exchange (ref Info->count, 0);
  92                         return n != 0;
  93                 }
  94
  95                 public unsafe int Count {
  96                         get {return Info->count;}
  97                         set {Interlocked.Exchange (ref Info->count, value);}
  98                 }
  99
 100                 [Map]
 101                 struct SignalInfo {
 102                         public int signum, count, read_fd, write_fd, have_handler;
 103                         public IntPtr handler;
 104                 }
 105
 106                 #region WaitHandle overrides
 107                 protected unsafe override void Dispose (bool disposing)
 108                 {
 109                         base.Dispose (disposing);
 110                         if (signal_info == IntPtr.Zero)
 111                                 return;
 112                         uninstall (signal_info);
 113                         signal_info = IntPtr.Zero;
 114                 }
 115
 116                 public override bool WaitOne ()
 117                 {
 118                         return WaitOne (-1, false);
 119                 }
 120
 121                 public override bool WaitOne (TimeSpan timeout, bool exitContext)
 122                 {
 123                         long ms = (long) timeout.TotalMilliseconds;
 124                         if (ms < -1 || ms > Int32.MaxValue)
 125                                 throw new ArgumentOutOfRangeException ("timeout");
 126                         return WaitOne ((int) ms, exitContext);
 127                 }
 128
 129                 public override bool WaitOne (int millisecondsTimeout, bool exitContext)
 130                 {
 131                         AssertValid ();
 132                         if (exitContext)
 133                                 throw new InvalidOperationException ("exitContext is not supported");
 134                         return WaitAny (new UnixSignal[]{this}, millisecondsTimeout) == 0;
 135                 }
 136                 #endregion
 137
 138                 public static int WaitAny (UnixSignal[] signals)
 139                 {
 140                         return WaitAny (signals, -1);
 141                 }
 142
 143                 public static int WaitAny (UnixSignal[] signals, TimeSpan timeout)
 144                 {
 145                         long ms = (long) timeout.TotalMilliseconds;
 146                         if (ms < -1 || ms > Int32.MaxValue)
 147                                 throw new ArgumentOutOfRangeException ("timeout");
 148                         return WaitAny (signals, (int) ms);
 149                 }
 150
 151                 public static unsafe int WaitAny (UnixSignal[] signals, int millisecondsTimeout)
 152                 {
 153                         if (signals == null)
 154                                 throw new ArgumentNullException ("signals");
 155                         if (millisecondsTimeout < -1)
 156                                 throw new ArgumentOutOfRangeException ("millisecondsTimeout");
 157                         IntPtr[] infos = new IntPtr [signals.Length];
 158                         for (int i = 0; i < signals.Length; ++i) {
 159                                 infos [i] = signals [i].signal_info;
 160                                 if (infos [i] == IntPtr.Zero)
 161                                         throw new InvalidOperationException ("Disposed UnixSignal");
 162                         }
 163                         return WaitAny (infos, infos.Length, millisecondsTimeout);
 164                 }
 165         }
 166 }
 167