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This can lead to using the wrong password on the wrong system. Alternatively, it can lead to forgetting the password after the change. Being locked out of your own Linux system can be frustrating, but you can use the rescue environment to change the root password, and then use your new password to get back into the system. To change the root password of the affected system, open the shadow file contained in the /etc directory using vi or pico, then find root s entry. For example, the root s shadow file entry looks like this: r oot:$1$Ptp2PgoF$NWZNuTH18YY8lI4GWlGLP.:14310:0:99999:7::: According to the format of the passwd and shadow files, the second column contains the user s password. You want to be able to log into the affected system as root without any password, and then change it later for safety reasons. The root s shadow file entry should look like this when you remove the characters of the second column: root::14310:0:99999:7::: Save the file and exit your text editor. Next, type reboot; this logs you out of the rescue environment automatically and begins to load the affected Linux system. Be sure to remove the rescue CD or DVD from the drive to avoid having to reload the rescue environment. After you boot into the affected system, log in as root, which won t prompt you for a password. Be sure to change the root user s password immediately and write it down, so you won t be locked out again. asp.net upc-a UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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6 Apr 2005 ... Demonstrates a method to draw UPC-A barcodes using C#. ... NET 2003 - 7.87 Kb. Image 1 for Drawing UPC-A Barcodes with C# ... class WaitForIt { private bool canGo; private object lockObject = new object(); public void WaitUntilReady() { lock (lockObject) { while (!canGo) { Monitor.Wait(lockObject); } } } public void GoNow() { lock (lockObject) { canGo = true; // Wake me up, before you go go. Monitor.PulseAll(lockObject); } } } asp.net upc-a Barcode UPC-A - CodeProject
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NET UPC-A Generator Controls to generate GS1 UPC-A barcodes in VB. NET , C# applications. Download Free Trial Package | Developer Guide included ... Both methods in this example acquire the lock before doing anything, because both inspect the canGo field, and we expect these to be called on different threads. WaitUntilReady then sits in a loop until that field is true. Each time it goes around the loop, it calls Monitor.Wait. This has three effects: first, it relinquishes the lock that s important, because otherwise, the thread that called GoNow would never get as far as setting the canGo field; second, it makes the thread calling WaitUntilReady block until some other thread calls either Pulse or PulseAll for lockObject; third, when Wait returns, it reacquires the lock. Warning: Sometimes administrators forget to change the blank password of root after doing this fix. Doing this asp.net upc-a UPC-A Barcode Generator for ASP . NET Web Application
This ASP . NET barcode library could easily create and print barcode images using .Net framework or IIS. UPC-A ASP . NET barcode control could be used as a ... asp.net upc-a UPC-A a.k.a as Universal Product Code version A, UPC-A ...
The UPC-A Code and the assignment of manufacturer ID numbers is controlled in the ... ASP . NET /Windows Forms/Reporting Services/Compact Framework ... Why use a loop here Wouldn t an if statement followed by a single call to Wait work In this case it would, but in general it s surprisingly easy to end up generating spurious notifications. Suppose we modified this example so that as well as offering a GoNow, we had a third method called OhHangOnAMinute which put the canGo field back to false the class becomes a gate which can open and close. It would be possible that by the time WaitUntilReady is woken up after a call to GoNow, the field had already transitioned back to false because of a call to OhHangOnAMinute. And while that can t happen with this simpler example, in general it s good to get in the habit of checking to see if the condition you were waiting for really holds when you come out of a wait, and be prepared to wait again if it doesn t. The GoNow method acquires the lock to make sure it s safe to modify the canGo field, which it sets to true. Then it calls PulseAll this tells the .NET Framework to wake up all threads currently waiting on lockObject as soon as we release the lock. (Pulse would just release a single thread, but since our WaitForIt class just has two states not ready and ready it needs to release all waiting threads when it becomes ready.) GoNow then returns, releasing the lock as the flow of execution leaves the lock block, which means that any threads waiting inside WaitUntilReady are now no longer blocked waiting for the pulse. However, if multiple threads are waiting, they won t all start running at once, because Monitor.Wait reacquires the lock before returning. It relinquishes the lock only temporarily while it waits it insists that we hold the lock before calling it, and we will be holding the lock again when it returns. Consequently, if PulseAll happened to release multiple threads, they still have to take it in turns as they come out of Wait. When WaitUntilReady gets to proceed, the loop will check canGo again, and this time it will be true and the loop will finish. The code will then leave the lock block, releasing the lock on lockObject, enabling the next waiting thread (if there are any) to do the same thing and so all waiting threads will become unblocked one after another. leaves your system wide open, not only to outside attackers, but to anyone who tries to log in as root. All anyone would have to do is to use the root username and hit the enter key for the password. Watch out! The monitor s close integration between locking and notification may seem a little odd it s even getting in our way here. This example would work perfectly well if all waiting threads were released simultaneously, instead of having to wait while they acquire the lock in turn. But in fact, the combined locking and notification is critical to most uses of Pulse and Wait. Notifications concern a change to shared state, so it s vital that code that raises notifications be in possession of the lock, and also that when code discovers a notification, it is in possession of the lock so that it can look at the modified state immediately. Without this, all sorts of subtle races can occur in the gap between notification and lock acquisition or the gap between releasing a lock and waiting for notification. Example 16-15 shows a simple program that uses the WaitForIt class from Example 16-14. It creates a thread that waits for a while and then calls the GoNow method. The main thread waits for that to happen by calling the WaitUntilReady method after starting the thread.
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