Red Hat Developer Toolset 1.x User Guide - Linux

32 Chapter 3. GNU Debugger (GDB)
Setting a New Breakpoint
To set a new breakpoint at a certain line, run the following command:
break [file_name:]line_number
You can also set a breakpoint on a certain function:
break [file_name:]function_name
Example 3.5. Setting a New Breakpoint
Assuming that you have compiled the fibonacci.c file listed in Example 3.1, “Compiling a C
Program With Debugging Information” with debugging information, you can set a new breakpoint at line
10 by running the following command:
(gdb) break 10
Breakpoint 1 at 0x4004e5: file fibonacci.c, line 10.
Listing Breakpoints
To display a list of currently set breakpoints, run the following command:
info breakpoints
Example 3.6. Listing Breakpoints
Assuming that you have followed the instructions in Example 3.5, “Setting a New Breakpoint”, you can
display the list of currently set breakpoints by running the following command:
(gdb) info breakpoints
Num Type Disp Enb Address What
1 breakpoint keep y 0x00000000004004e5 in main at fibonacci.c:10
Deleting Existing Breakpoints
To delete a breakpoint that is set at a certain line, run the following command:
clear line_number
Similarly, to delete a breakpoint that is set on a certain function, run:
clear function_name
You can also delete all breakpoints at once. To do so, run the clear command with no additional
arguments:
clear