CMSG_LEN
messageHeader->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
messageHeader->cmsg_len = CMSG_LEN(sizeof(int));
messageHeader->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
int count = (header->cmsg_len - CMSG_LEN(0)) / sizeof(int);
messageHeader->cmsg_len = CMSG_LEN(sizeof(int) * totalCount);
if (header->cmsg_len < CMSG_LEN(0) || header->cmsg_len > dataLen)
cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) {
cm->cmsg_len == CMSG_LEN(sizeof(int))) {
cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
cm->cmsg_len == CMSG_LEN(sizeof(struct ip6_mtuinfo))) {
scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
scmsgp->cmsg_len = CMSG_LEN(sizeof(int));
scmsgp->cmsg_len = CMSG_LEN(rthdrlen);
CMSG_LEN(sizeof(struct in6_pktinfo)))
cm->cmsg_len == CMSG_LEN(sizeof(int)))
cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
if (cmsg->cmsg_len != CMSG_LEN(sizeof(fd))) {