SemaphoreRights Enumeration
Specifies the access control rights that can be applied to named system semaphore objects.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.
Namespace: System.Security.AccessControlAssembly: System (in System.dll)
| Member name | Description | |
|---|---|---|
| Modify | The right to release a named semaphore. | |
| Delete | The right to delete a named semaphore. | |
| ReadPermissions | The right to open and copy the access rules and audit rules for a named semaphore. | |
| ChangePermissions | The right to change the security and audit rules associated with a named semaphore. | |
| TakeOwnership | The right to change the owner of a named semaphore. | |
| Synchronize | The right to wait on a named semaphore. | |
| FullControl | The right to exert full control over a named semaphore, and to modify its access rules and audit rules. |
Use the SemaphoreRights enumeration to specify access control rights when you create SemaphoreSecurity objects. To apply access rights to a named system semaphore, use SemaphoreSecurity objects with the Semaphore.Semaphore(Int32, Int32, String, Boolean, SemaphoreSecurity) constructor and the Semaphore.SetAccessControl method.
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Security on synchronization objects is not supported for Windows 98 or Windows Millennium Edition. |
The following code example demonstrates the use of SemaphoreRights values when creating and using SemaphoreAccessRule objects. The example creates a SemaphoreSecurity object, adds rules that allow and deny various rights for the current user, and displays the resulting pair of rules. The example then allows new rights for the current user and displays the result, showing that the new rights are merged with the existing AccessControlType.Allow rule.
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This example does not attach the security object to an Semaphore object; see SemaphoreSecurity, Semaphore.GetAccessControl method, and Semaphore.SetAccessControl. |
Imports System Imports System.Threading Imports System.Security.AccessControl Imports System.Security.Principal Public Class Example Public Shared Sub Main() ' Create a string representing the current user. Dim user As String = Environment.UserDomainName _ & "\" & Environment.UserName ' Create a security object that grants no access. Dim mSec As New SemaphoreSecurity() ' Add a rule that grants the current user the ' right to enter or release the semaphore. Dim rule As New SemaphoreAccessRule(user, _ SemaphoreRights.Synchronize _ Or SemaphoreRights.Modify, _ AccessControlType.Allow) mSec.AddAccessRule(rule) ' Add a rule that denies the current user the ' right to change permissions on the semaphore. rule = New SemaphoreAccessRule(user, _ SemaphoreRights.ChangePermissions, _ AccessControlType.Deny) mSec.AddAccessRule(rule) ' Display the rules in the security object. ShowSecurity(mSec) ' Add a rule that allows the current user the ' right to read permissions on the semaphore. This ' rule is merged with the existing Allow rule. rule = New SemaphoreAccessRule(user, _ SemaphoreRights.ReadPermissions, _ AccessControlType.Allow) mSec.AddAccessRule(rule) ShowSecurity(mSec) End Sub Private Shared Sub ShowSecurity(ByVal security As SemaphoreSecurity) Console.WriteLine(vbCrLf & "Current access rules:" & vbCrLf) For Each ar As SemaphoreAccessRule In _ security.GetAccessRules(True, True, GetType(NTAccount)) Console.WriteLine(" User: {0}", ar.IdentityReference) Console.WriteLine(" Type: {0}", ar.AccessControlType) Console.WriteLine(" Rights: {0}", ar.SemaphoreRights) Console.WriteLine() Next End Sub End Class 'This code example produces output similar to following: ' 'Current access rules: ' ' User: TestDomain\TestUser ' Type: Deny ' Rights: ChangePermissions ' ' User: TestDomain\TestUser ' Type: Allow ' Rights: Modify, Synchronize ' ' 'Current access rules: ' ' User: TestDomain\TestUser ' Type: Deny ' Rights: ChangePermissions ' ' User: TestDomain\TestUser ' Type: Allow ' Rights: Modify, ReadPermissions, Synchronize
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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