CMSG32_LEN
if (i > CMSG32_LEN(0)) {
error = copyout(CMSG_DATA(cmsg), *q + CMSG32_LEN(0),
i - CMSG32_LEN(0));
cspace = CMSG_SPACE(cmsg32.cmsg_len - CMSG32_LEN(0));
cmsg->cmsg_len = CMSG_LEN(cmsg32.cmsg_len - CMSG32_LEN(0));
cmsg32.cmsg_len - CMSG32_LEN(0));
i = cmsg32.cmsg_len = CMSG32_LEN(j);