Debuggers

gdb

gdb - GNU Debugger

Breakpoints

• breakpoints are the points where debugger will stop the program execution, and then you can inspect the memory i.e. variables

• b main - puts breakpoint at the beginning of the program

• b - puts breakpoint at the current line
• b N - puts breakpoint at the line N
• b +N - puts breakpoint N lines down from the current line
• b fN - puts the breakpoint at the beginning of the function fN
• d N - deletes the breakpoint number N
• info breaks - list breakpoints

Continues or run till error

• r - runs the program until a breakpoint or error
• c - continues running the program until the next breakpoint is reached

Run until next function

• f - runs until the next function is finished

Step

• s - runs the next line of program
• s N - runs next N lines of the program

Skip over

• n - like s but does not step into functions
• u N - runs until you get N lines in the front of the current line

Inspecting

• p var - prints the current value of the variable var