How does one obtain the pid of the currently debugged process in gdb?

Question

Inside gdb, what command will provide the pid of the process getting debugged?

Most of the google results discuss only how to attach gdb to a process once we know the pid.

Answer 1

One simple way is info inferior. Here I'm debugging gdb with itself and this command shows the PID of the debuggee:

(top-gdb) info inferior
  Num  Description       Executable        
* 1    process 14068     /home/tromey/gdb/build/gdb/gdb 

You can also just call the ordinary C function:

(top-gdb) print getpid()
$3 = 14068

Answer 2

Another method:

(gdb) python print(gdb.selected_inferior().pid)
32737

See more info about the gdb Python inferior API: https://sourceware.org/gdb/onlinedocs/gdb/Inferiors-In-Python.html#Inferiors-In-Python