Util/SystemInformation.cs

   1 //
   2 // SystemInformation.cs
   3 //
   4 // Copyright (C) 2004-2006 Novell, Inc.
   5 //
   6
   7 //
   8 // Permission is hereby granted, free of charge, to any person obtaining a
   9 // copy of this software and associated documentation files (the "Software"),
  10 // to deal in the Software without restriction, including without limitation
  11 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12 // and/or sell copies of the Software, and to permit persons to whom the
  13 // Software is furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all 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
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24 // DEALINGS IN THE SOFTWARE.
  25 //
  26
  27 using System;
  28 using System.Collections;
  29 using System.Diagnostics;
  30 using System.Globalization;
  31 using System.IO;
  32 using System.Reflection;
  33 using System.Runtime.InteropServices;
  34 using System.Text;
  35 using System.Text.RegularExpressions;
  36
  37 namespace Beagle.Util {
  38
  39         public class SystemInformation {
  40
  41                 [DllImport ("libc", SetLastError=true)]
  42                 static extern int getloadavg (double[] loadavg, int nelem);
  43
  44                 const double loadavg_poll_delay = 3;
  45                 static DateTime proc_loadavg_time  = DateTime.MinValue;
  46                 static double cached_loadavg_1min  = -1;
  47                 static double cached_loadavg_5min  = -1;
  48                 static double cached_loadavg_15min = -1;
  49
  50                 static private void CheckLoadAverage ()
  51                 {
  52                         // Only call getloadavg() at most once every 10 seconds
  53                         if ((DateTime.Now - proc_loadavg_time).TotalSeconds < loadavg_poll_delay)
  54                                 return;
  55
  56                         double [] loadavg = new double [3];
  57                         int retval = getloadavg (loadavg, 3);
  58
  59                         if (retval == -1)
  60                                 throw new IOException ("Could not get system load average: " + Mono.Unix.Native.Stdlib.strerror (Mono.Unix.Native.Stdlib.GetLastError ()));
  61                         else if (retval != 3)
  62                                 throw new IOException ("Could not get system load average: getloadavg() returned an unexpected number of samples");
  63
  64                         cached_loadavg_1min  = loadavg [0];
  65                         cached_loadavg_5min  = loadavg [1];
  66                         cached_loadavg_15min = loadavg [2];
  67
  68                         proc_loadavg_time = DateTime.Now;
  69                 }
  70
  71                 static public double LoadAverageOneMinute {
  72                         get {
  73                                 CheckLoadAverage ();
  74                                 return cached_loadavg_1min;
  75                         }
  76                 }
  77
  78                 static public double LoadAverageFiveMinute {
  79                         get {
  80                                 CheckLoadAverage ();
  81                                 return cached_loadavg_5min;
  82                         }
  83                 }
  84
  85                 static public double LoadAverageFifteenMinute {
  86                         get {
  87                                 CheckLoadAverage ();
  88                                 return cached_loadavg_15min;
  89                         }
  90                 }
  91
  92                 ///////////////////////////////////////////////////////////////
  93
  94                 const double screensaver_poll_delay = 1;
  95                 static DateTime screensaver_time = DateTime.MinValue;
  96                 static bool cached_screensaver_running = false;
  97                 static double cached_screensaver_idle_time = 0;
  98
  99                 private enum ScreenSaverState {
 100                         Off      = 0,
 101                         On       = 1,
 102                         Cycle    = 2,
 103                         Disabled = 3
 104                 }
 105
 106                 private enum ScreenSaverKind {
 107                         Blanked  = 0,
 108                         Internal = 1,
 109                         External = 2
 110                 }
 111
 112                 [DllImport ("libbeagleglue.so")]
 113                 extern static unsafe int screensaver_info (ScreenSaverState *state,
 114                                                            ScreenSaverKind *kind,
 115                                                            ulong *til_or_since,
 116                                                            ulong *idle);
 117
 118                 static private void CheckScreenSaver ()
 119                 {
 120                         if ((DateTime.Now - screensaver_time).TotalSeconds < screensaver_poll_delay)
 121                                 return;
 122
 123                         ScreenSaverState state;
 124                         ScreenSaverKind kind;
 125                         ulong til_or_since = 0, idle = 0;
 126                         int retval;
 127
 128                         unsafe {
 129                                 retval = screensaver_info (&state, &kind, &til_or_since, &idle);
 130                         }
 131
 132                         if (retval != 0) {
 133                                 cached_screensaver_running = (state == ScreenSaverState.On);
 134                                 cached_screensaver_idle_time = idle / 1000.0;
 135                         } else {
 136                                 cached_screensaver_running = false;
 137                                 cached_screensaver_idle_time = 0;
 138                         }
 139
 140                         screensaver_time = DateTime.Now;
 141                 }
 142
 143                 static public bool ScreenSaverRunning {
 144                         get {
 145                                 CheckScreenSaver ();
 146                                 return cached_screensaver_running;
 147                         }
 148                 }
 149
 150                 // returns number of seconds since input was received
 151                 // from the user on any input device
 152                 static public double InputIdleTime {
 153                         get {
 154                                 CheckScreenSaver ();
 155                                 return cached_screensaver_idle_time;
 156                         }
 157                 }
 158
 159                 ///////////////////////////////////////////////////////////////
 160
 161                 const double acpi_poll_delay = 30;
 162                 const string proc_ac_state_filename = "/proc/acpi/ac_adapter/AC/state";
 163                 const string ac_present_string = "on-line";
 164                 static bool proc_ac_state_exists = true;
 165                 static DateTime using_battery_time = DateTime.MinValue;
 166                 static bool using_battery;
 167
 168                 static public void CheckAcpi ()
 169                 {
 170                         if (! proc_ac_state_exists)
 171                                 return;
 172
 173                         if ((DateTime.Now - using_battery_time).TotalSeconds < acpi_poll_delay)
 174                                 return;
 175
 176                         if (! File.Exists (proc_ac_state_filename)) {
 177                                 proc_ac_state_exists = false;
 178                                 using_battery = false;
 179                                 return;
 180                         }
 181
 182                         Stream stream = new FileStream (proc_ac_state_filename,
 183                                                         System.IO.FileMode.Open,
 184                                                         FileAccess.Read,
 185                                                         FileShare.Read);
 186                         TextReader reader = new StreamReader (stream);
 187
 188                         string line = reader.ReadLine ();
 189                         using_battery = (line != null) && (line.IndexOf (ac_present_string) == -1);
 190
 191                         reader.Close ();
 192                         stream.Close ();
 193
 194                         using_battery_time = DateTime.Now;
 195                 }
 196
 197                 static public bool UsingBattery {
 198                         get {
 199                                 CheckAcpi ();
 200                                 return using_battery;
 201                         }
 202                 }
 203
 204                 ///////////////////////////////////////////////////////////////
 205
 206                 [DllImport ("libbeagleglue")]
 207                 extern static int get_vmsize ();
 208
 209                 [DllImport ("libbeagleglue")]
 210                 extern static int get_vmrss ();
 211
 212                 static public int VmSize {
 213                         get { return get_vmsize (); }
 214                 }
 215
 216                 static public int VmRss {
 217                         get { return get_vmrss (); }
 218                 }
 219
 220                 ///////////////////////////////////////////////////////////////
 221
 222                 static private int disk_stats_read_reqs;
 223                 static private int disk_stats_write_reqs;
 224                 static private int disk_stats_read_bytes;
 225                 static private int disk_stats_write_bytes;
 226
 227                 static private DateTime disk_stats_time = DateTime.MinValue;
 228                 static private double disk_stats_delay = 1.0;
 229
 230                 static private uint major, minor;
 231
 232                 // Update the disk statistics with data for block device on the (major,minor) pair.
 233                 static private void UpdateDiskStats ()
 234                 {
 235                         string buffer;
 236
 237                         if (major == 0)
 238                                 return;
 239
 240                         // We only refresh the stats once per second
 241                         if ((DateTime.Now - disk_stats_time).TotalSeconds < disk_stats_delay)
 242                                 return;
 243
 244                         // Read in all of the disk stats
 245                         using (StreamReader stream = new StreamReader ("/proc/diskstats"))
 246                                 buffer = stream.ReadToEnd ();
 247
 248                         // Find our partition and parse it
 249                         const string REGEX = "[\\s]+{0}[\\s]+{1}[\\s]+[a-zA-Z0-9]+[\\s]+([0-9]+)[\\s]+([0-9]+)[\\s]+([0-9]+)[\\s]+([0-9]+)";
 250                         string regex = String.Format (REGEX, major, minor);
 251                         Regex r = new Regex (regex, RegexOptions.IgnoreCase | RegexOptions.Compiled);
 252                         for (System.Text.RegularExpressions.Match m = r.Match (buffer); m.Success; m = m.NextMatch ()) {
 253                                 disk_stats_read_reqs = Convert.ToInt32 (m.Groups[1].ToString ());
 254                                 disk_stats_read_bytes = Convert.ToInt32 (m.Groups[2].ToString ());
 255                                 disk_stats_write_reqs = Convert.ToInt32 (m.Groups[3].ToString ());
 256                                 disk_stats_write_bytes = Convert.ToInt32 (m.Groups[4].ToString ());
 257                         }
 258
 259                         disk_stats_time = DateTime.Now;
 260                 }
 261
 262                 // Get the (major,minor) pair for the block device from which the index is mounted.
 263                 static private void GetIndexDev ()
 264                 {
 265                         Mono.Unix.Native.Stat stat;
 266                         if (Mono.Unix.Native.Syscall.stat (PathFinder.StorageDir, out stat) != 0)
 267                                 return;
 268
 269                         major = (uint) stat.st_dev >> 8;
 270                         minor = (uint) stat.st_dev & 0xff;
 271                 }
 272
 273                 static public int DiskStatsReadReqs {
 274                         get {
 275                                 if (major == 0)
 276                                          GetIndexDev ();
 277                                 UpdateDiskStats ();
 278                                 return disk_stats_read_reqs;
 279                         }
 280                 }
 281
 282                 static public int DiskStatsReadBytes {
 283                         get {
 284                                 if (major == 0)
 285                                          GetIndexDev ();
 286                                 UpdateDiskStats ();
 287                                 return disk_stats_read_bytes;
 288                         }
 289                 }
 290
 291                 static public int DiskStatsWriteReqs {
 292                         get {
 293                                 if (major == 0)
 294                                          GetIndexDev ();
 295                                 UpdateDiskStats ();
 296                                 return disk_stats_write_reqs;
 297                         }
 298                 }
 299
 300                 static public int DiskStatsWriteBytes {
 301                         get {
 302                                 if (major == 0)
 303                                          GetIndexDev ();
 304                                 UpdateDiskStats ();
 305                                 return disk_stats_write_bytes;
 306                         }
 307                 }
 308
 309                 static public bool IsPathOnBlockDevice (string path)
 310                 {
 311                         Mono.Unix.Native.Stat stat;
 312                         if (Mono.Unix.Native.Syscall.stat (path, out stat) != 0)
 313                                 return false;
 314
 315                         return (stat.st_dev >> 8 != 0);
 316                 }
 317
 318                 ///////////////////////////////////////////////////////////////
 319
 320                 [DllImport("libc")]
 321                 private static extern int prctl (int option, byte [] arg2, ulong arg3, ulong arg4, ulong arg5);
 322
 323                 // From /usr/include/linux/prctl.h
 324                 private const int PR_SET_NAME = 15;
 325
 326                 public static void SetProcessName(string name)
 327                 {
 328 #if OS_LINUX
 329                         if (prctl (PR_SET_NAME, Encoding.ASCII.GetBytes (name + '\0'), 0, 0, 0) < 0) {
 330                                 Logger.Log.Warn ("Couldn't set process name to '{0}': {1}", name,
 331                                                  Mono.Unix.Native.Stdlib.GetLastError ());
 332                         }
 333 #endif
 334                 }
 335
 336                 ///////////////////////////////////////////////////////////////
 337
 338                 public static string MonoRuntimeVersion {
 339                         get {
 340                                 Type t = typeof (object).Assembly.GetType ("Mono.Runtime");
 341
 342                                 string ver = (string) t.InvokeMember ("GetDisplayName",
 343                                                                       BindingFlags.InvokeMethod
 344                                                                       | BindingFlags.NonPublic
 345                                                                       | BindingFlags.Static
 346                                                                       | BindingFlags.DeclaredOnly
 347                                                                       | BindingFlags.ExactBinding,
 348                                                                       null, null, null);
 349
 350                                 return ver;
 351                         }
 352                 }
 353
 354                 ///////////////////////////////////////////////////////////////
 355
 356 #if false
 357                 static void Main ()
 358                 {
 359                         Gtk.Application.Init ();
 360                         while (true) {
 361                                 Console.WriteLine ("{0} {1} {2} {3} {4} {5} {6} {7}",
 362                                                    LoadAverageOneMinute,
 363                                                    LoadAverageFiveMinute,
 364                                                    LoadAverageFifteenMinute,
 365                                                    ScreenSaverRunning,
 366                                                    InputIdleTime,
 367                                                    UsingBattery,
 368                                                    DiskStatsReadReqs,
 369                                                    VmSize);
 370                                 System.Threading.Thread.Sleep (1000);
 371                         }
 372                 }
 373 #endif
 374         }
 375 }