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The LENGTH parameter is the maximum number of connections that will be held in a queue by the operating system before the remote hosts receive an unable to connect response This allows you to control the server loading and response times It doesn t affect the number of connections that can be open at any one time, since that is controlled (we hope) by the server application For example, with a web server, since the response time for an individual request is quite small, you may want to specify a relatively high value so the time between individual accept calls will be relatively low Setting the queue length to a low value will affect performance, since the operating system may be refusing connections even when your server is not very busy It s also worth keeping in mind the type of communication you expect With a web server, you tend to get a high number of relatively short requests in a short space of time If you consider that a typical web page consists of one HTML file and ten images, then you could easily get 11 requests within a few seconds, and you should therefore set the queue length to a higher value With an FTP server, you tend to get a smaller number of concurrent connections, but with longer times to service the actual requests This would tend to indicate a lower value, thus helping to reduce the overall loading of your server It s always important to remember that your server can run as many child processes as it likes, and so you should also have other safeguards, such as connection counters or load monitors, to ensure that you are not accepting and servicing more requests than you can handle The queue length will make no difference here If the time to accept a connection and spawn a new process is one second, you could get 100.

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requests every second and end up with 100 child processes This could kill a small server, no matter how small the individual requests might be Once your socket is ready and listening, you need to accept new connections as they are made by clients The accept function handles this, blocking the current process until a new connection is made and accepted

What is the result for Launcher (Choose all that apply) A do1 do2 do3 B "do1 ", followed by an exception C Compilation fails due to an error on line 5 of Launcher D Compilation fails due to an error on line 6 of Launcher E F Compilation fails due to an error on line 7 of Launcher Compilation fails due to an error on line 8 of Launcher

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The function monitors SOCKET, opening the NEWSOCKET filehandle on the accepted connection It returns the packed address of the remote host that made the connection, or the false value if the connection failed This is usually used in combination with fork (see 14) to support multiple simultaneous connections from remote hosts For example, here is a very simple web server (supporting HTTP) written entirely in Perl It uses the listensocket function and demonstrates the simplicity of the network server once you have gotten past the complexities of creating the original listening socket

use Ssockets; use FileHandle; use Cwd; use Getopt::Std; use Socket; getopts('d'); $SIG{'INT'} = $SIG{'QUIT'} = \&exit_request_handler; $SIG{'CHLD'} = \&child_handler; my ($res); my ($SERVERPORT) = 80; unless(listensocket(*SERVERSOCKET, $SERVERPORT, 'tcp', 5)) { die "$0: ", $Ssockets::error; } autoflush SERVERSOCKET 1; chroot(getcwd()); die "$0: Couldn't change root directory, are you root " unless (getcwd() eq "/");

print "Changing root to ", getcwd(), "\n" if $opt_d; print "Simple HTTP Server Started\n" if $opt_d; while(1) { ACCEPT_CONNECT: { ($remaddr = accept(CHILDSOCKET, SERVERSOCKET)) || redo ACCEPT_CONNECT; } autoflush CHILDSOCKET 1; my $pid = fork(); die "Cannot fork, $!" unless defined($pid); if ($pid == 0) { my ($remip) = inet_ntoa((unpack_sockaddr_in($remaddr))[1]); print "Connection accepted from $remip\n" if $opt_d; $_ = <CHILDSOCKET>; print "Got Request $_" if $opt_d; chomp; unless (m/(\S+) (\S+)/) { print "Malformed request string $_\n" if $opt_d; bad_request(*CHILDSOCKET); } else { my ($command) = $1; my ($arg) = $2; if (uc($command) eq 'GET') { if (open(FILE, "<$arg")) { while(<FILE>) { print CHILDSOCKET $_; } close(FILE); }

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Answer (for Objective 71): C, D, E, and F are correct class Utils is not public so it CANNOT be accessed from a different package A and B are incorrect based on the above

else { bad_request(*CHILDSOCKET); } } } close(CHILDSOCKET); exit(0); } close(CHILDSOCKET); } sub bad_request { my ($SOCKET) = shift; print $SOCKET <<EOF; <html> <head> <title>Bad Request</title> </head> <body> <h1>Bad Request</h1> The file you requested could not be found </body> </html> EOF } sub child_handler { wait; } sub exit_request_handler { my ($recvsig) = @_; $SIG{'INT'} = $SIG{'QUIT'} = 'IGNORE'; close(SERVERSOCKET); close(CHILDSOCKET); die "Quitting on signal $recvsig\n"; } PROGRAMMING WITH PERL

The main loop of this program will continue forever, until either a fatal error occurs or the program receives the SIGINT or SIGQUIT signal This operation is dealt with by signal handlers, which we ll cover in more detail in 14 The main acceptance loop is here,

ACCEPT_CONNECT: { ($remaddr = accept(CHILDSOCKET, SERVERSOCKET)) || redo ACCEPT_CONNECT; }

19 Given:

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