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from which they started The main mechanism by which daemons can interface with the rest of the system is through interprocess communication (IPC) channels, by sending messages to the system-wide log file, or by appending to a file on disk The role of inetd is to function as a super-server to other network server related processes, such as telnet, ftp, tftp, etc It s a simple philosophy: Not all server processes (including those that accept new connections) are called upon so often that they require a program to be running in memory all the time The main reason for the existence of a super-server is to conserve system resources So instead of constantly maintaining potentially dozens of services loaded in memory waiting to be used, they are all listed in inetd s configuration file, /etc/inetdconf On their behalf, inetd listens for incoming connections Thus, only a single process needs to be in memory A secondary benefit of inetd falls to those processes needing network connectivity but whose programmers do not want to have to write it into the system The inetd program will handle the network code and pass incoming network streams into the process as its standard input (stdin) Any of the process s output (stdout) is sent back to the host that has connected to the process NOTE Unless you are programming, you don t have to be concerned with inetd s stdin/ stdout feature On the other hand, for someone who wants to write a simple script and make it available through the network, it s worth exploring this powerful tool As a general rule of thumb, low-volume services (such as tftp) are usually best run through the inetd, whereas higher-volume services (such as web servers) are better run as a stand-alone process that is always in memory, ready to handle requests Current versions of Fedora, Red Hat Enterprise Linux (RHEL), OpenSuSE, Mandrake, and even Mac OS X ship with a newer incarnation of inetd called xinetd the name is an acronym for extended Internet services daemon The xinetd program accomplishes the same task as the regular inetd program: It helps to start programs that provide Internet services Instead of having such programs automatically start up during system initialization and remain unused until a connection request arrives, xinetd instead stands in the gap for those programs and listens on their normal service ports As a result, when xinetd hears a service request meant for one of the services it manages, it then starts or spurns the appropriate service Inasmuch as xinetd is similar to inetd in function, it should be noted that it includes a new configuration file format and a lot of additional features The xinetd daemon uses a configuration file format that is quite different from the classic inetd configuration file format (Most other variants of UNIX, including Solaris, AIX, and FreeBSD, use the classic inetd format) This means that if you have an application that relies on inetd, you may need to provide some manual adjustments to make it work Of course, you should definitely contact the developers of the application and let them know of the change so that they can release a newer version that works with the new xinetd configuration format as well.

This method starts by seeing if there is already a row currently selected by checking if the selectedDownload variable is null If the selectedDownload variable is not null, DownloadManager removes itself as an observer of the download so that it no longer receives change notifications Next the clearing flag is checked If the table is not empty and the clearing flag is false, then first the selectedDownload variable is updated with the Download corresponding to the row selected Second, the DownloadManager is registered

Numbers are even easier: when an NXT-G 2.0 VARIABLE block is configured to hold a number, it can be only a positive or negative number. Examples include 5, -3.0, and 101.25. For NXT-G 1.0 software users, however, the VARIABLE block is limited to only positive and negative integer values, so numbers such as 4.5 or -10.2 will be rounded to the nearest integer (5 and -10 for my examples). Logic values have only two choices: True or False. An NXT-G VARIABLE block configured to hold a logical value can hold only True or False and nothing else.

In this section, we will cover the new xinetd daemon If your system uses inetd, you should be able to view the /etc/inetdconf file and see the similarities between inetd and xinetd NOTE Your Linux distribution might not have the xinetd software installed out of the box The xinetd package can be installed with yum on a Fedora distro (or RHEL, Centos) by running

Part IV:

as an Observer with the newly selected Download Finally, updateButtons( ) is called to update the button states based on the selected Download s state

The /etc/xinetdconf file consists of a series of blocks that take the following format:

The updateButtons( ) method updates the state of all the buttons on the button panel based on the state of the selected download The updateButtons( ) method is shown here:

/* Update each button's state based on the currently selected download's status */ private void updateButtons() { if (selectedDownload != null) { int status = selectedDownloadgetStatus(); switch (status) { case DownloadDOWNLOADING: pauseButtonsetEnabled(true); resumeButtonsetEnabled(false); cancelButtonsetEnabled(true); clearButtonsetEnabled(false); break; case DownloadPAUSED: pauseButtonsetEnabled(false); resumeButtonsetEnabled(true); cancelButtonsetEnabled(true); clearButtonsetEnabled(false); break; case DownloadERROR: pauseButtonsetEnabled(false); resumeButtonsetEnabled(true); cancelButtonsetEnabled(false); clearButtonsetEnabled(true); break; default: // COMPLETE or CANCELLED pauseButtonsetEnabled(false); resumeButtonsetEnabled(false); cancelButtonsetEnabled(false); clearButtonsetEnabled(true); } } else { // No download is selected in table pauseButtonsetEnabled(false); resumeButtonsetEnabled(false); cancelButtonsetEnabled(false); clearButtonsetEnabled(false); } }

blockname { variable = value }