cvs-get-buffer-create is a compiled Lisp function in `pcvs-util.el'.

(cvs-get-buffer-create NAME &optional NOREUSE)

Create a buffer NAME unless such a buffer already exists.
If the NAME looks like an absolute file name, the buffer will be created
with `create-file-buffer' and will probably get another name than NAME.
In such a case, the search for another buffer with the same name doesn't
use the buffer name but the buffer's `list-buffers-directory' variable.
If NOREUSE is non-nil, always return a new buffer.