mod_hold_installed_mod
modp = mod_hold_installed_mod(fullname, 1, 0, &retval);
mp = mod_hold_installed_mod(path, 1, 1, &rc);
modp = mod_hold_installed_mod(filenamep, use_path, 0, &retval);
static struct modctl *mod_hold_installed_mod(char *, int, int, int *);