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default supplies each process a standard set of signal handlers to deal with incoming signals From a system administrator s standpoint, the most important handler is for signal numbers 9 and 15: kill process and terminate process (Okay, maybe using kill as a name wasn t so inappropriate after all ) When kill is invoked, it requires at least one parameter: the process identification number (PID) as derived from the ps command When passed only the PID number, kill will by default send signal 15, terminate process Sending the terminate process signal is a lot like politely asking a process to stop what it s doing and shut down Some programs intercept this signal and perform a number of actions so that they can cleanly shut down Others just stop running in their tracks Either way, sending the signal isn t a guaranteed method for making a process stop The optional parameter is a number prefixed by a dash character (-), where the number represents a signal number The two signals that system administrators are most interested in are 9 and 1: kill and hang up The kill signal is the impolite way of making a process stop Instead of asking a process to stop, the operating system takes it upon itself to kill the process The only time this signal will fail is when the process is in the middle of a system call (such as a request to open a file), in which case the process will die once it returns from the system call The hangup signal is a bit of a throwback to when most users of UNIX connected to the system via VT100 style terminals When a user s connection would drop in the middle of a session, all of his or her running processes would receive a hangup signal (often called a SIGHUP, or HUP for short) This signal gave the processes an opportunity to perform a clean shutdown or, in the case of some programs designed to keep running in the background, safely ignore the signal These days, the HUP signal is used to tell certain server applications to reread their configuration files Most applications otherwise ignore the signal Security Issues of Kill The capability to terminate a process is obviously a very powerful one The developers of the kill command realized this and made sure that security precautions existed so that users could kill only those processes they had permission to kill For example, nonroot users could send signals only to their own processes If a nonroot user attempts to send signals to processes that he or she does not own, the system returns error messages On the other hand, the root user may send signals to all processes in the system This means, of course, that when using the kill command, the root user needs to exercise great care to ensure that he or she doesn t accidentally kill the wrong process! Example: To terminate process number 2059, you would type the following:.

Step 2 Select On (recommended) to protect the PC from unwanted access through the Internet connection Step 3 In Windows XP, select the Advanced tab of the Windows Firewall dialog box and click the Settings button for the Network Connection Settings (see Figure 25-7)

The materials you need for this lab are A notepad and pencil to document the speci cations Access to a working computer with a word-processing or spreadsheet application installed, as well as access to the Internet to facilitate research and documentation of the CPU socket speci cations (optional) The Mike Meyers A+ Guide to Managing and Troubleshooting PCs, Vol 1: Essentials textbook for reference

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Note The following advanced options have been removed from the Windows Firewall Settings in Windows Vista in an attempt to make the OS more secure; thus, the following steps will only work in Windows XP There are still methods for setting up exceptions (see the Exceptions tab in Windows Firewall dialog box, speci cally the Add Port button) but most of the advanced features have been moved to the Administrative Tools

Example: To kill process number 593 in an almost guaranteed way, you would type the following:

Step 4 This opens the Advanced Settings dialog box, where you can allow various services to pass through the Internet connection and access dedicated servers on your internal network For instance, if you have an FTP server that you have technicians update from the eld, you will want to enable external communication by allowing TCP service port 21 to pass through the rewall (see Figure 25-8)

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