Does Gdb Use Ptrace?

GDB controls the program that we are debugging (the inferior) through a system call named ptrace(). It is not the most elegant system call, but it works. ... ptrace() can, for example, set the registers, peek and poke memory, continue or interrupt the inferior — all the good stuff we need for debugging.

How does GDB work in Linux?

GDB allows you to do things like run the program up to a certain point then stop and print out the values of certain variables at that point, or step through the program one line at a time and print out the values of each variable after executing each line. GDB uses a simple command line interface.

How does GDB breakpoint work?

Software Breakpoint

They work by patching the code you are trying to execute with an instruction that triggers a debug event in some fashion. This is accomplished by injecting a breakpoint instruction or when that is not supported by inserting an instruction that causes a fault that halts the core.