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It s not only excessive disk usage that can cause problems. Services can be disrupted if users bog down the system by running too many things, and eventually, the system could be rendered unusable for others. Luckily, you can also set resource limits on a user session. Resource limits are implemented via PAM (pluggable authentication modules). Though PAM is primarily an authentication mechanism, one of its modules, pam_limits, is responsible for applying resource limits to user sessions. These limits can be viewed and configured in /etc/security/limits.conf.

Tester.MoveFile(file.FullName, file.FullName + ".bak");

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We pass in the original filename and the new name, and Windows moves the file for us. In this example, there is no advantage and actually a considerable disadvantage to using P/Invoke. (Situations where you truly need P/Invoke are increasingly rare and obscure. To illustrate the mechanisms, we ve picked an example that s simple enough not to obscure the details of how P/Invoke works, but this means it s not a scenario in which you d use P/Invoke in practice.) You have left the world of managed code, and the result is that you ve abandoned type safety and your code will no longer run in

partial-trust scenarios. Example 19-2 shows the complete source code for using P/ Invoke to move the files.

Note: For more information on PAM, check http://en.wikipedia.org/wiki/Pluggable_ Authentication_Modules.

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using System; using System.IO; using System.Runtime.InteropServices; namespace UsingPInvoke { class Tester { // declare the WinAPI method you wish to P/Invoke [DllImport("kernel32.dll", EntryPoint = "MoveFile", ExactSpelling = false, CharSet = CharSet.Unicode, SetLastError = true)] static extern bool MoveFile( string sourceFile, string destinationFile); public static void Main() { // make an instance and run it Tester t = new Tester(); string theDirectory = @"c:\test\media"; DirectoryInfo dir = new DirectoryInfo(theDirectory); t.ExploreDirectory(dir); } // Set it running with a directory name private void ExploreDirectory(DirectoryInfo dir) { // make a new subdirectory string newDirectory = "newTest"; DirectoryInfo newSubDir = dir.CreateSubdirectory(newDirectory); // get all the files in the directory and // copy them to the new directory FileInfo[] filesInDir = dir.GetFiles(); foreach (FileInfo file in filesInDir) { string fullName = newSubDir.FullName + "\\" + file.Name; file.CopyTo(fullName); Console.WriteLine("{0} copied to newTest", file.FullName); } // get a collection of the files copied in filesInDir = newSubDir.GetFiles();

// delete some and rename others int counter = 0; foreach (FileInfo file in filesInDir) { string fullName = file.FullName; if (counter++ % 2 == 0) { // P/Invoke the Win API Tester.MoveFile(fullName, fullName + ".bak"); Console.WriteLine("{0} renamed to {1}", fullName, file.FullName);

Figure 4-7. Sequence activity After the Sequence activity, drag a Parallel activity onto the Workflow Designer. Notice the Parallel activity is made up of two Sequence activities. Add a new Code activity to the left Sequence activity within the Parallel activity; call this activity ParallelLeft. Generate Handlers for this Code activity and add a message box stating Parallel Left. Next, add a Code activity to the Sequence activity on the right within the Parallel activity. Call this Code activity ParallelRight.

The syntax of setting a resource limit is: <username|@groupname|*> <soft|hard> <resource limit> <value> The first property can be a username or group, which means the resource limit will either affect a user or a whole group. If for the limit applies to a user, just supply the username; if it s for a group, prefix the group name with an at sign (@). An asterisk (*) would denote all users are affected by this resource limit. The second property specifies whether the resource limit is a soft limit or a hard limit. On the soft limit, the user is warned by the system resource limit has been exceeded. The hard limit, on the other hand, is the maximum resource limit, and when a user attempts to exceed this limit, the system logs this behavior and prevents the requested action from taking place. The <resource limit> specifies what limitations you can set, such as maximum CPU time, file size, the number of simultaneous logins, and number of processes. Finally, the <value> property specifies the maximum value of the resource limit.

} else {

}

Let s try setting a couple of resource limitations. For example, if you want to limit the maximum logins of the staff group to two, you can do this by adding this limit: @staff hard maxlogins 2 If you would like to limit the login time for a user, juan, to 1 hour, you may do so by adding a limit to maximum CPU time in minutes like so: juan hard cpu 60 To limit maximum memory allocated to the staff group to 2 MB, you can set the resource limit memlock in kilobytes as follows: @staff hard memlock 2048

}

} } // delete the subdirectory newSubDir.Delete(true);

file.Delete(); Console.WriteLine("{0} deleted.", fullName);

You can set the maximum size of a file that the staff user can create to 10 MB by modifying the data resource limit in kilobytes like this: @staff hard memlock 10240

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