55   struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);  in SendFileDescriptorVector()  local
56   cmsg->cmsg_level = SOL_SOCKET;  in SendFileDescriptorVector()
57   cmsg->cmsg_type = SCM_RIGHTS;  in SendFileDescriptorVector()
58   cmsg->cmsg_len = cmsg_len;  in SendFileDescriptorVector()
60   int* cmsg_fds = reinterpret_cast<int*>(CMSG_DATA(cmsg));  in SendFileDescriptorVector()
119   struct cmsghdr* cmsg;  in ReceiveFileDescriptorVector()  local
120   for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != nullptr; cmsg = CMSG_NXTHDR(&msg, cmsg)) {  in ReceiveFileDescriptorVector()
121     if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {  in ReceiveFileDescriptorVector()
122       LOG(ERROR) << "received unexpected cmsg: [" << cmsg->cmsg_level << ", " << cmsg->cmsg_type  in ReceiveFileDescriptorVector()
141     if (cmsg->cmsg_len % sizeof(int) != 0) {  in ReceiveFileDescriptorVector()
142       LOG(FATAL) << "cmsg_len(" << cmsg->cmsg_len << ") not aligned to sizeof(int)";  in ReceiveFileDescriptorVector()
143     } else if (cmsg->cmsg_len <= CMSG_LEN(0)) {  in ReceiveFileDescriptorVector()
144       LOG(FATAL) << "cmsg_len(" << cmsg->cmsg_len << ") not long enough to hold any data";  in ReceiveFileDescriptorVector()
147     int* cmsg_fds = reinterpret_cast<int*>(CMSG_DATA(cmsg));  in ReceiveFileDescriptorVector()
148     size_t cmsg_fdcount = static_cast<size_t>(cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);  in ReceiveFileDescriptorVector()