SemaphoreRights Enumeration
Assembly: System (in system.dll)
| Member name | Description | |
|---|---|---|
| ChangePermissions | The right to change the security and audit rules associated with a named semaphore. | |
| Delete | The right to delete a named semaphore. | |
| FullControl | The right to exert full control over a named semaphore, and to modify its access rules and audit rules. | |
| Modify | The right to release a named semaphore. | |
| ReadPermissions | The right to open and copy the access rules and audit rules for a named semaphore. | |
| Synchronize | The right to wait on a named semaphore. | |
| TakeOwnership | The right to change the owner of a named semaphore. |
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 System.Threading.Semaphore constructor and the Semaphore.SetAccessControl method.
Note: |
|---|
| 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.
Note: |
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| This example does not attach the security object to an Semaphore object; see SemaphoreSecurity, Semaphore.GetAccessControl method, and Semaphore.SetAccessControl. |
using System; using System.Threading; using System.Security.AccessControl; using System.Security.Principal; public class Example { public static void Main() { // Create a string representing the current user. string user = Environment.UserDomainName + "\\" + Environment.UserName; // Create a security object that grants no access. SemaphoreSecurity mSec = new SemaphoreSecurity(); // Add a rule that grants the current user the // right to enter or release the semaphore. SemaphoreAccessRule rule = new SemaphoreAccessRule(user, SemaphoreRights.Synchronize | 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); } private static void ShowSecurity(SemaphoreSecurity security) { Console.WriteLine("\r\nCurrent access rules:\r\n"); foreach(SemaphoreAccessRule ar in security.GetAccessRules(true, true, typeof(NTAccount))) { Console.WriteLine(" User: {0}", ar.IdentityReference); Console.WriteLine(" Type: {0}", ar.AccessControlType); Console.WriteLine(" Rights: {0}", ar.SemaphoreRights); Console.WriteLine(); } } } /*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 */
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