PASSFD_NUM
cmsgh->cmsg_len = CMSG_LEN(sizeof(int) * PASSFD_NUM);
CMSG_LEN(sizeof(int) * PASSFD_NUM);
if(cmsgh->cmsg_len != CMSG_LEN(sizeof(fd) * PASSFD_NUM))
for (i = 0; i < PASSFD_NUM; ++i) {
cmsgh->cmsg_len = CMSG_LEN(sizeof(int) * PASSFD_NUM);
char control[CMSG_SPACE(sizeof(int) * PASSFD_NUM)];