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This extracts the port number and packed IP address from a sockaddr_in structure As an alternative to the preceding function, you can use the pack_sockaddr_in and unpack_sockaddr_in functions instead:

A similar set of functions pack and unpack addresses to and from the sockaddr_un structure used for sockets in the AF_UNIX domain:

sockaddr_un PATHNAME sockaddr_un SOCKADDR_UN pack_sockaddr_un PATHNAME unpack_sockaddr_un SOCKADDR_UN

10 11 12 13 14 15 16 17 18 19 20 21 }

The line termination for network communication should be \n\n However, because of the differences in line termination under different platforms, care should be taken to ensure that this value is actually sent and received You can do this by using the octal values \012\012 Another alternative is to use the constants $CR, $LF, and $CRLF, which equate to \015, \012, and \015\012, respectively

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These are exported from the Socket module only on request, either individually or with the :crlf export tag:

static synchronized void push() { shove(); } static void shove() { synchronized(Stubbornclass) { Systemoutprint(x-- + " "); try { Threadsleep(2000); } catch (Exception e) { ; } if(x > 0) push(); } } public static void main(String[] args) { t1 = new Thread(new Stubborn()); t1start(); new Thread(new Stubborn())start(); }

use Socket qw/:DEFAULT :crlf/;

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The process for communicating with a remote socket is as follows: 1 Create and open a local socket, specifying the protocol family (PF_INET or PF_UNIX), socket type, and top-level protocol number (TCP, UDP, etc) 2 Determine the IP address of the remote machine you want to talk to 3 Determine the remote service port number you want to talk to 4 Create a sockaddr_in structure based on the IP address and remote service port 5 Initiate the connection to the remote host This all sounds very complicated, but in fact, it is relatively easy Many of the functions you need to use have already been discussed in this chapter To speed up the process, it s a good idea to use something like the function connectsocket, shown here:

// turn it into strings $currentTime = $now["hours"] ":" $now["minutes"] ":" $now["seconds"]; $currentDate = $now["mday"] "" $now["mon"] "" $now["year"]; // result: "It is now 12:37:47 on 30102006" (example) echo "It is now $currentTime on $currentDate"; >

use Socket; sub connectsocket { my ($SOCKETHANDLE, $remotehost_name, $service_name, $protocol_name) = @_; my ($port_num, $sock_type, $protocol_num); my ($remote_ip_addr, $remote_socket); $protocol_num = getprotobyname($protocol_name); unless ($protocol_num) { $error = "Couldn't find protocol $protocol_name"; return; } $sock_type = $protocol_name eq 'tcp' SOCK_STREAM : SOCK_DGRAM; unless (socket($SOCKETHANDLE, PF_INET, $sock_type, $protocol_num)) {

Which are true (Choose all that apply) A Compilation fails B The output is 5 4 3 2 1 C The output is 5 4 3 2 1 0 D The program could deadlock E F The output could be 5, followed by deadlock If the sleep() invocation was removed, the chance of deadlock would decrease

$error = "Couldn't create a socket, $!"; return; } if ($service_name =~ /^\d+$/ ) { $port_num = $service_name; } else { $port_num = (getservbyname($service_name, $protocol_name))[2]; unless($port_num) { $error = "Can't find service $service_name"; return; } } $remote_ip_addr = gethostbyname($remotehost_name); unless ($remote_ip_addr) { $error = "Can't resolve $remotehost_name to an IP address"; return; } $remote_socket = sockaddr_in($port_num, $remote_ip_addr); unless(connect($SOCKETHANDLE, $remote_socket)) { $error = "Unable to connect to $remotehost_name: $!"; return; } return(1); }

I ve used a variable, $error, to indicate the type of error, thus allowing you to return true or false from the function to indicate success or failure The bulk of the function s code is given over to identifying or resolving names and/or numbers for service ports and other base information The core of the function s processes is the socket function, which associates a filehandle with the relevant protocol family The syntax of the socket function is

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G As it stands, the program can t deadlock, but if shove() was changed to synchronized, then the program could deadlock Answer (for Objective 43): C is correct It might look like this code could deadlock, but there is only one lock, so no deadlock can occur A, B, D, E, F, and G are incorrect based on the above

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