__rpc_compress_pollfd
extern int __rpc_compress_pollfd(int, pollfd_t *, pollfd_t *);
npollfds = __rpc_compress_pollfd(svc_max_pollfd,
npollfds = __rpc_compress_pollfd(svc_max_pollfd,
extern int __rpc_compress_pollfd(int, pollfd_t *, pollfd_t *);