Function __program_invocation_short_name 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __program_invocation_short_name() -> *mut *mut c_char

Get the directory-less name used to invoke the program.

This provides the basis for the C-facing macro definition of program_invocation_short_name, and should not be used directly.

The program_invocation_short_name variable is a GNU extension.