rump_uiorw
struct uio * rump_uio_setup(void *, size_t, off_t, enum rump_uiorw);
struct uio * rump_pub_uio_setup(void *, size_t, off_t, enum rump_uiorw);
rump_uio_setup(void *buf, size_t bufsize, off_t offset, enum rump_uiorw rw)
rump_pub_uio_setup(void *arg1, size_t arg2, off_t arg3, enum rump_uiorw arg4)