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To reference a library in another directory, you have to specify that directory using the -Ldir option. This option adds the specified directory to the list of directories that will be searched with the -l option. In the following example, the user links to a library in the mydir directory called myio.so. For a shared library, you will first have to have the dl and ld link names set up, such as libmyio.so and libmyio.so.1 for a libmyio.so.1.0 file.

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The gdb program is the symbolic debugger available on your Linux system. If you run your program and it crashes for some reason, you can use a symbolic debugger to track down the

error. A symbolic debugger allows you to step through your program line by line, displaying the source code for each line as you execute it. You can decide to stop in specific functions and display the contents of active variables. You can even check specific addresses and the contents of the stack. Note Instead of using the command line interface shown here, you can use any of several available graphical interfaces for gdb. These include the GNU Data Display Debugger (DDD) available from Red Hat 7.2 on your CD-ROM and at ftp.redhat.com. Also available are the GNU Visual Debugger (GVD) from www.gnome.org, and the KDE Debugger, KDbg, from apps.kde.com. To be able to use an executable file with a symbolic debugger, you need to compile and link your program using the -g option. In the next example, a program is compiled and prepared for the symbolic debuggers. Once you have a prepared executable file, you can then use it with the symbolic debugger.

You invoke the gdb debugger with the keyword gdb and the name of the executable file. In the next example, the name of the executable file is a.out:

bBuffer(3) = 255 bBuffer(4) = 255 RETURN '============================================================= ReadSensors: ' place code here to read bumpers and infrared sensors ' example code is given for Parallax line sensors 'read bumper sensors 'none for now bBuffer(0) = 0 'read infrared sensors 'none for now bBuffer(1) = 0 'read line sensors Right: HIGH 7: PAUSE 1: SENSORS.BIT0 = IN4: INPUT 7 Center: HIGH 8: PAUSE 1: SENSORS.BIT1 = IN4: INPUT 8 Left: HIGH 9: PAUSE 1: SENSORS.BIT2 = IN4: INPUT 9 bBuffer(2) = SENSORS 'set the last two bytes to zero bBuffer(3) = 0 bBuffer(4) = 0 RETURN '=============================================================

The gdb command will place you in the debugger, replacing the Linux prompt ($), with the gdb prompt (gdb). You run your program in the debugger by typing at the prompt the command run:

and the global community Thousands of years ago, humans first learned to cultivate the wild herbs, grasses, grains, and roots that they had traditionally gathered Concurrently, humans were creating the first settlements and domesticating wild animals Next, humans began to grow, harvest, and stockpile grain, which helped to form the concept of ownership Over time, humans learned to defend their possessions and their interests, to accumulate foodstuffs and other goods for the future, and to live together in tribal and other communal settings As wealth accumulated in modest increments, rules about how to live together were needed, and the first laws to govern human interaction were developed Thus, the beginning of civilization was launched Walled cities, fortifications, and other measures to protect property and communities demonstrate that with increases in wealth came increased risk in a new form.

If your program has in it an fopen or open statement, it means it will be using a data file at some point in the program. If this is so, then gdb also needs to know the name of such a data file. When you type run in gdb to run your program, you must also supply the actual names of such data files:

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When you are finished, leave the debugger with the quit command, q or quit:

Most gdb commands have a single-letter equivalent consisting of the first letter of the command. Instead of entering the command run, you can enter just r. For quit, you can enter the letter q, for print just p, and for next the letter n. The gdb commands are listed in Table 3. Table 3: The: gdb Symbolic Debugger Command Description run quit Run the program. Quit gdb.

Display the contents of a variable. Display the address of a variable. Assign a value to a variable during the gdb session. Display a stack trace showing a sequence of function calls with function names and their arguments.