-int nfs_get_fd(struct nfs_context *nfs);
-int nfs_which_events(struct nfs_context *nfs);
-int nfs_service(struct nfs_context *nfs, int revents);
+EXTERN int nfs_get_fd(struct nfs_context *nfs);
+EXTERN int nfs_which_events(struct nfs_context *nfs);
+EXTERN int nfs_service(struct nfs_context *nfs, int revents);
+EXTERN int nfs_queue_length(struct nfs_context *nfs);