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So, why have we just spent a page or so discussing these implementation details, if we re never going to see them again While you don t usually need to use the Delegate class directly, it is easy to get confused by language-specific voodoo and lose track of what a delegate really is: it is just an object, which in turn calls whichever function we like, all specified through a couple of properties.

Let s start by defining a new delegate type to reference our document processing functions. As I mentioned earlier, rather than using that Delegate class, C# lets us define a delegate type using syntax which looks pretty much like a function declaration, prefixed with the keyword delegate:

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Even setting the permissions on the file so it is world writable would not permit writing to the file because the MAC is still consulted When SELinux makes a decision about access, the result is stored in memory in what is called the Access Vector Cache (AVC) SELinux also generates a message about the access decision These messages are logged via the audit daemon and placed in this file: /var/log/audit/auditlog The format of the AVC messages makes them hard to interpret, but you can use another tool called setroubleshoot to process these messages and write them to /var/log/messages in a human-readable format You can install the setroubleshoot tool with this command: yum install setroubleshoot This package also comes with a GUI tool that you can use to display the messages You can do this by accessing the SELinx Troubleshooter option at Applications System Tools SELinux Troubleshooter.

delegate void DocumentProcess(Document doc);

That defines a delegate type for a method which returns void, and takes a single Document parameter. The delegate s type name is DocumentProcess.

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Anyone who has sensibly decided not to go any further into the implementation details can skip this sidebar. For those still reading... When you declare a delegate like this, under the covers C# emits a class called DocumentProcess, derived from MulticastDelegate (which is a subclass of Delegate). Among other things, that emitted class has a function called Invoke(int param) which matches the signature we declared on the delegate. So how is Invoke implemented Surprisingly, it doesn t have any method body at all! Instead, all of the members of the emitted class are marked as special by the compiler, and the runtime actually provides the implementations so that it can (more or less) optimally dispatch the delegated function.

The SELinux Troubleshooter includes the error message, then explains why the error occurred and the steps required to resolve the problem Figure 9-3 shows an example where access was denied and setroubleshoot suggests how to resolve the problem..

Having added the delegate, we have two types called DocumentProcess, which is not going to work. Let s get rid of our old DocumentProcess abstract base class, and the three

classes we derived from it. Isn t it satisfying, getting rid of code There is less to test and you are statistically likely to have fewer bugs. So how are we going to adapt our DocumentProcessor to use our new definition for the DocumentProcess type Take a look at Example 5-9.

class DocumentProcessor { private readonly List<DocumentProcess> processes = new List<DocumentProcess>(); public List<DocumentProcess> Processes { get { return processes; } } public void Process(Document doc) { foreach(DocumentProcess process in Processes) { // Hmmm... this doesn't work anymore process.Process(doc); } }

Figure 9-3. Explanation from SELinux Troubleshooter If you encounter a situation where a policy denies access to your service, but no boolean exists to permit access, then you might have to alter your policy to enable access. The policy is essentially a set of rules that you can change. Making changes to the policy is beyond the scope of this book, but you can find many books and online resources that cover this procedure.

}

We re still storing a set of DocumentProcess objects, but those objects are now delegates to member functions that conform to the signature specified by the DocumentProcess delegate. We can still iterate over the process collection, but we no longer have a Process method on the object. The equivalent function on the delegate type is a method called Invoke which matches the signature of our delegated function:

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