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where you just cycle around for as long as it takes until you get a valid connection Remember that accept blocks process execution, so it s not a major concern that you ll be continually looping through this section In fact, you should only ever redo the block if the accepted connection could not be opened properly Once you have opened a valid connection, you fork a new child process to handle the communication using the newly created CHILDSOCKET filehandle Since you are forking a new process each time, you don t have to worry about the fact that the filehandle name is identical You close the filehandle in the parent immediately after the child process has been forked There are a couple of other important notes here First of all, you use a command line option to handle the printout of additional debugging information Second, you use chroot to change the root directory of the script to the current directory This guarantees the security of the web server by restricting which files can be served to only the files within the current directory and all its subdirectories Even attempts to access files or directories associated by symbolic links will fail Finally, note the communication method employed Because of the complexities of two-way communication over a single socket, you have to make some assumptions about the process involved For HTTP, the client sends a single-line request and then waits for the server to send the reply, sending EOF or closing the connection as appropriate The information returned by the server must be text based and can consist of HTTP header information and the actual body of data

The standard Perl distribution actually includes a module that provides a simpler interface to the built-in socket functions, much like the previous scripts If you are not designing a custom solution, you might find that the distributed module better suits your needs It s also more likely to be updated regularly than my own solution, and as

12:

2 public class Wacky { 3 public static void main(String[] args) { 4 int x = 5; 5 int y = (x < 6) 7 : 8; 6 Systemoutprint(y + " "); 7 boolean b = (x < 6) false : true; 8 Systemoutprintln(b + " "); 9 assert(x < 6) : "bob"; 10 assert( ((x < 6) false : true) ) : "fred"; 11 } }

part of the standard Perl distribution, it should work on a wide range of platforms without any modifications to your scripts

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Initiating a client network connection with the IO::Socket module is very simple and actually follows a similar model to the connectsocket function:

use IO::Socket; $sock = new IO::Socket::INET (PeerAddr => 'twinspark', PeerPort => 4003, Proto => 'tcp' );

Array ( [seconds] => 34 [minutes] => 14 [hours] => 9 [mday] => 23 [wday] => 2 [mon] => 5 [year] => 2006 [yday] => 137 [weekday] => Monday [month] => February [0] => 1107752144 )

And, if the code compiles, the invocation:

The $sock scalar now contains a reference to a filehandle that you can use to transfer information to a remote host

The server side initialization follows a similar model:

use IO::Socket; $sock = new IO::Socket::INET (LocalHost LocalPort Proto Listen Reuse );

'twinspark', 4003, 'tcp', 5, 1

Answer (for Objective 76): A, D, and F are correct The ternary operator assigns the first value when the expression is true, so y == 7, and b == false The second assert statement has a ternary operator as an expression and since the result is false, fred is added to the AssertionError stack trace B, C, E, and G are incorrect based on the above

This follows the same fundamental idea as the listensocket function It creates a socket and binds to the address and port specified by LocalHost and LocalPort The listen queue is set to the value of the Listen element of the passed hash, and you set the SO_REUSEADDR option with the Reuse hash element Once the socket is created, you can use it as before, although many of the functions are now available as methods to the newly created socket object Thus, you can accept new requests on a server socket with statements like this:

$new_sock = $sock->accept();

Note how the client- and server-side object-constructing methods are identical The type of socket to be created is determined by the keys passed to the constructor

20 Given:

You can employ IO::Select in exactly the same way as we saw in 8 when working with more traditional filehandles For the record, here s a sample script that uses IO::Select and IO::Socket to support multiple client connections:

#!/usr/local/bin/perl -w use use use use strict; IO::Socket; IO::Select; Socket;

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