In This article we will discuss, how to do remote debugging a C++ application using gdb debugger.
What is Remote Debugging
Remote Debugging allows the application to run on a Target machine and user can debug it on a Host Machine.
Suppose, you have a application “Dummy” , with Remote Debugging you can run this application on MACHINE 1 (Target Machine) and can debug it through MACHINE 2 (Host Machine).
How to do Remote Debugging using gdb
It involves 2 steps,
1.) Start a gdbserver:
On Host Machine start gdbserver with application to debug on a specified IP and Port i.e.
gdbserver <IP>:<PORT> <APPLICATION>
gdbserver 192.168.1.8:8082 Debug/Dummy
Process Debug/Dummy created; pid = 3523 Listening on port 8082
It will start the gdbserver for application “Dummy” on port 8082 and will wait for a host to connect to this on port 8082.
2.) Connect gdb from Host Machine to remote gdbserver
From the Host Machine start gdb and execute following command on gdb command prompt
target remote <TARGET MACHINE IP>:<GDBSERVER PORT>
(gdb) target remote 192.168.1.8:8082
It will connect this gdb from Host Machine to remote gdbserver running on Target Machine. Now on Host Machine it will show a gdb command prompt.
Remote debugging using 192.168.1.8:8082 warning: Could not load vsyscall page because no executable was specified try using the "file" command first. 0x00007ffff7dd9cd0 in ?? () (gdb)
Now gdb from Host Machine is connected to target Machine’s gdbserver. Press “c” to continue debugging,