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

   1 //
   2 // Mono.Unix/UnixEnvironment.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.Collections;
  31 using System.Text;
  32 using Mono.Unix;
  33
  34 namespace Mono.Unix {
  35
  36         public sealed /* static */ class UnixEnvironment
  37         {
  38                 private UnixEnvironment () {}
  39
  40                 public static string CurrentDirectory {
  41                         get {
  42                                 return UnixDirectory.GetCurrentDirectory ();
  43                         }
  44                         set {
  45                                 UnixDirectory.SetCurrentDirectory (value);
  46                         }
  47                 }
  48
  49                 public static string MachineName {
  50                         get {
  51                                 StringBuilder buf = new StringBuilder (8);
  52                                 int r = 0;
  53                                 Error e = (Error) 0;
  54                                 do {
  55                                         buf.Capacity *= 2;
  56                                         r = Syscall.gethostname (buf);
  57                                 } while (r == (-1) && ((e = Syscall.GetLastError()) == Error.EINVAL) ||
  58                                                 (e == Error.ENAMETOOLONG));
  59                                 if (r == (-1))
  60                                         UnixMarshal.ThrowExceptionForLastError ();
  61                                 return buf.ToString ();
  62                         }
  63                         set {
  64                                 Syscall.sethostname (value);
  65                         }
  66                 }
  67
  68                 public static long GetConfigurationValue (SysConf name)
  69                 {
  70                         long r = Syscall.sysconf (name);
  71                         if (r == -1 && Syscall.GetLastError() == Error.EINVAL)
  72                                 UnixMarshal.ThrowExceptionForLastError ();
  73                         return r;
  74                 }
  75
  76                 public static string GetConfigurationString (ConfStr name)
  77                 {
  78                         ulong len = Syscall.confstr (name, null, 0);
  79                         if (len == 0)
  80                                 return "";
  81                         StringBuilder buf = new StringBuilder ((int) len+1);
  82                         len = Syscall.confstr (name, buf, len);
  83                         return buf.ToString ();
  84                 }
  85
  86                 public static void SetNiceValue (int inc)
  87                 {
  88                         int r = Syscall.nice (inc);
  89                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
  90                 }
  91
  92                 public static uint User {
  93                         get {return UnixUser.GetCurrentUserId ();}
  94                 }
  95
  96                 public static string UserName {
  97                         get {return UnixUser.GetCurrentUserName();}
  98                 }
  99
 100                 public static string Login {
 101                         get {return UnixUser.GetLogin ();}
 102                 }
 103
 104                 public static int CreateSession ()
 105                 {
 106                         return Syscall.setsid ();
 107                 }
 108
 109                 public static void SetProcessGroup ()
 110                 {
 111                         int r = Syscall.setpgrp ();
 112                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
 113                 }
 114
 115                 public static int GetProcessGroup ()
 116                 {
 117                         return Syscall.getpgrp ();
 118                 }
 119
 120                 [Obsolete ("Use GetSupplementaryGroupIds")]
 121                 public static uint[] GetSupplementaryGroups ()
 122                 {
 123                         return GetSupplementaryGroupIds ();
 124                 }
 125
 126                 public static uint[] GetSupplementaryGroupIds ()
 127                 {
 128                         int ngroups = Syscall.getgroups (0, new uint[]{});
 129                         if (ngroups == -1)
 130                                 UnixMarshal.ThrowExceptionForLastError ();
 131                         uint[] groups = new uint[ngroups];
 132                         int r = Syscall.getgroups (groups);
 133                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
 134                         return groups;
 135                 }
 136
 137                 [Obsolete ("Use SetSupplementaryGroupIds")]
 138                 public static void SetSupplementaryGroups (uint[] list)
 139                 {
 140                         SetSupplementaryGroupIds (list);
 141                 }
 142
 143                 public static void SetSupplementaryGroupIds (uint[] list)
 144                 {
 145                         int r = Syscall.setgroups (list);
 146                         UnixMarshal.ThrowExceptionForLastErrorIf (r);
 147                 }
 148
 149                 public static int GetParentProcessId ()
 150                 {
 151                         return Syscall.getppid ();
 152                 }
 153
 154                 public static UnixProcess GetParentProcess ()
 155                 {
 156                         return new UnixProcess (GetParentProcessId ());
 157                 }
 158
 159                 public static string[] GetUserShells ()
 160                 {
 161                         ArrayList shells = new ArrayList ();
 162
 163                         lock (Syscall.usershell_lock) {
 164                                 try {
 165                                         Syscall.setusershell ();
 166                                         string shell;
 167                                         while ((shell = Syscall.getusershell ()) != null)
 168                                                 shells.Add (shell);
 169                                 }
 170                                 finally {
 171                                         Syscall.endusershell ();
 172                                 }
 173                         }
 174
 175                         return (string[]) shells.ToArray (typeof(string));
 176                 }
 177         }
 178 }
 179
 180 // vim: noexpandtab