mcs/class/Mono.Posix/Mono.Posix/PosixEnvironment.cs

   1 //
   2 // Mono.Posix/PosixEnvironment.cs
   3 //
   4 // Authors:
   5 //   Jonathan Pryor (jonpryor@vt.edu)
   6 //
   7 // (C) 2004 Jonathan Pryor
   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.Text;
  31 using Mono.Posix;
  32
  33 namespace Mono.Posix {
  34
  35         public sealed /* static */ class PosixEnvironment
  36         {
  37                 private PosixEnvironment () {}
  38
  39                 public static string CurrentDirectory {
  40                         get {
  41                                 return PosixDirectory.GetCurrentDirectory ();
  42                         }
  43                         set {
  44                                 PosixDirectory.SetCurrentDirectory (value);
  45                         }
  46                 }
  47
  48                 public static string MachineName {
  49                         get {
  50                                 StringBuilder buf = new StringBuilder (8);
  51                                 int r = 0;
  52                                 Error e = (Error) 0;
  53                                 do {
  54                                         buf.Capacity *= 2;
  55                                         r = Syscall.gethostname (buf);
  56                                 } while (r == (-1) && ((e = Syscall.GetLastError()) == Error.EINVAL) ||
  57                                                 (e == Error.ENAMETOOLONG));
  58                                 if (r == (-1))
  59                                         PosixMarshal.ThrowExceptionForLastError ();
  60                                 return buf.ToString ();
  61                         }
  62                         set {
  63                                 Syscall.sethostname (value);
  64                         }
  65                 }
  66
  67                 public static long GetConfigurationValue (SysConf name)
  68                 {
  69                         long r = Syscall.sysconf (name);
  70                         if (r == -1 && Syscall.GetLastError() == Error.EINVAL)
  71                                 PosixMarshal.ThrowExceptionForLastError ();
  72                         return r;
  73                 }
  74
  75                 public static string GetConfigurationString (ConfStr name)
  76                 {
  77                         ulong len = Syscall.confstr (name, null, 0);
  78                         if (len == 0)
  79                                 return "";
  80                         StringBuilder buf = new StringBuilder ((int) len+1);
  81                         len = Syscall.confstr (name, buf, len);
  82                         return buf.ToString ();
  83                 }
  84
  85                 public static void SetNiceValue (int inc)
  86                 {
  87                         int r = Syscall.nice (inc);
  88                         PosixMarshal.ThrowExceptionForLastErrorIf (r);
  89                 }
  90
  91                 public static string UserName {
  92                         get {return PosixUser.GetCurrentUserName();}
  93                 }
  94
  95                 public static int CreateSession ()
  96                 {
  97                         return Syscall.setsid ();
  98                 }
  99
 100                 public static void SetProcessGroup ()
 101                 {
 102                         int r = Syscall.setpgrp ();
 103                         PosixMarshal.ThrowExceptionForLastErrorIf (r);
 104                 }
 105
 106                 public static int GetProcessGroup ()
 107                 {
 108                         return Syscall.getpgrp ();
 109                 }
 110
 111                 public static uint[] GetSupplementaryGroups ()
 112                 {
 113                         int ngroups = Syscall.getgroups (0, new uint[]{});
 114                         if (ngroups == -1)
 115                                 PosixMarshal.ThrowExceptionForLastError ();
 116                         uint[] groups = new uint[ngroups];
 117                         int r = Syscall.getgroups (groups);
 118                         PosixMarshal.ThrowExceptionForLastErrorIf (r);
 119                         return groups;
 120                 }
 121
 122                 public static void SetSupplementaryGroups (uint[] list)
 123                 {
 124                         int r = Syscall.setgroups (list);
 125                         PosixMarshal.ThrowExceptionForLastErrorIf (r);
 126                 }
 127         }
 128 }
 129
 130 // vim: noexpandtab