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Many of the malware types described in this chapter are available for the Mac, but we have yet to see a retrovirus for Retrospect, BakBone, or any other application used to back up a Mac However, a few specific attacks against Retrospect have been reported, usually exploiting weak passwords NOTE: Retroviruses are not named after Retrospect, the popular backup application from EMC They re actually named after their biological counterparts which masquerade as a component of one s DNA A macro virus is a virus attack designed to exploit applications that have the ability to create mini-programs, called macros, within documents Microsoft Word and Microsoft Excel are examples of software that can create these dangerous documents Thus, most of the known macro viruses in existence are designed for Microsoft Office (even though there are macro viruses such as BadBunny designed for OpenOffice).

When a tail call is made, the .NET Common Language Runtime can drop the current stack frame before executing the target function, rather than waiting for the call to complete. Sometimes this optimization is performed by the F# compiler. If the n = 1000000 check were removed in the previous program, then the program would run indefinitely. (Note that n would cycle around to the negative numbers, because arithmetic is unchecked for overflow unless you open the module Microsoft.FSharp.Core.Operators.Checked.) Functions such as tailCallRecursion are known as tail-recursive functions. When you write recursive functions, you should check either that they re tail recursive or that they won t be used with inputs that cause them to recurse to an excessive depth. The following sections, give some examples of techniques you can use to make your functions tail recursive.

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And these macro viruses are cross-platform, found on both Macs and PCs and can have damaging effects on both Windows and Mac machines Table 8 1 summarizes the types of threats discussed in this section..

The Music app also comes with a widget (Figure 13 7). The widget allows you to quickly launch playlists, pause or play music, and launch the Music app. Your phone may also have a docking accessory for playing your music on larger speakers. Launch the Music app and you ll see music arranged by artist, album song, and playlist. To add to a playlist, long-click the name of the song, artist, or album, and choose Add to playlist. You ll be prompted to either add to an existing playlist or create a new one. TIP: You can also use the Music app to turn your favorite song into a ringtone. Simply long-click a song (not an album or artist) and select Use as phone ringtone.

Tail recursion is particularly important when you re processing F# lists, because lists can be long and recursion is the natural way to implement many list-processing functions. For example, here is a function to find the last element of a list (this must traverse the entire list, because F# lists are pointers to the head of the list): let rec last l = match l with | [] -> invalidArg "l" "the input list should not be empty" | [h] -> h | h::t -> last t

Program that can copy itself and infect a computer without the permission or knowledge of the end user Self-replicating computer program, often used to distribute malicious content, spreading through a computer network

This function is tail recursive because no work happens after the recursive call last t However, many list functions are written most naturally in non-tail-recursive ways Although it can be a little annoying to write these functions using tail recursion, it s often better to use tail recursion than to leave the potential for stack overflow lying around your code For example, the following function creates a list of length n where every entry in the list is the value x: let rec replicateNotTailRecursiveA n x = if n <= 0 then [] else x :: replicateNotTailRecursiveA (n-1) x The problem with this function is that work is done after the recursive call.

Trojan horse Code inserted into an application that causes a program to (Trojan) perform actions not intended by the user Logic bomb Malicious code triggered by a specific event such as a specific date and time

This becomes obvious when you write the function in the following fashion: let rec replicateNotTailRecursiveB n x = if n <= 0 then [] else let recursiveResult = replicateNotTailRecursiveB (n-1) x x :: recursiveResult Clearly, a value is being constructed by the expression x :: recursiveResult after the recursive call replicateNotTailRecursiveB (n-1) x This means the function isn t tail recursive The solution is to write the function using an accumulating parameter This is often done by using an auxiliary function that accepts the accumulating parameter: let rec replicateAux n x acc = if n <= 0 then acc else replicateAux (n-1) x (x::acc) let replicate n x = replicateAux n x [] Here, the recursive call to replicateAux is tail recursive.

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