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<title>GDB Debugger</title>
<head>
<script language="JavaScript">
</script>
</head>
<body bgcolor="#ffffcc">
<hr>
<center>
<h1>GDB Debugger</h1>
</center>
<hr>
<p>
The other common debug programs on Unix systems are dbx and dbxtool.<p>
Before a program can be processed by the debugger, it must be compiled
with the debugger option.
<pre>
gcc -ggdb -o pipe pipe.c
</pre>
The program can then be passed to the debugger with
<pre>
gdb pipe
</pre>
To pass command line parameters to the program use:
<pre>
set args -size big
</pre>
This is equivalent to saying:
<pre>
pipe -size big
</pre>
To single step:
<pre>
break
run
step
</pre>
The <b>step</b> command stops execution at the next source statement,
if that statement is a function call, gdb will single step into the function.
<br>
A simular command is <b>next</b> this will also single step source
statements but when a it meets a function call, the function is executed
and gdb stops when it reaches a new source statement in the calling
function.
<p>
<b>step</b> can be abreviated to <b>s</b>
<br>
<b>next</b> can be abreviated to <b>n</b>
<p>
To set break points:
<pre>
break 48 <-- Program will stop BEFORE executing line 48
break FuncName <-- Program will stop when entering the function
run
</pre>
To display the contents of a variable:
<pre>
print ant[0]
</pre>
To change the value of a variable:
<pre>
set ant[0] = 4
set char = 'z'
</pre>
<p>
<hr>
<p>
<center>
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<tr align=center>
<td width=25%>
<a href=../cref.html> Top</a>
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<a href=../SYNTAX/keywords.html> Keywords</a>
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<a href=../FUNCTIONS/funcref.htm> Functions</a>
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</center>
<p>
<hr>
<address>Martin Leslie
</address><p>
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