Function: emacs-pid
emacs-pid is a function defined in editfns.c.
Signature
(emacs-pid)
Documentation
Return the process ID of Emacs, as an integer.
Probably introduced at or before Emacs version 19.23.
Source Code
// Defined in /usr/src/emacs/src/editfns.c
{
pid_t pid = getpid ();
return INT_TO_INTEGER (pid);
}