100     ssize_t nBytes = ::recvfrom(sid, (void*)msg.data(), msg.size(), flags, srcAddr, addrlen);  in recvfrom()  local
101     if (nBytes > 0) {  in recvfrom()
104             nBytes = 0;  in recvfrom()
107             msg.resize(nBytes);  in recvfrom()
108             dataCb->onReceive(msg.data(), nBytes, &recver);  in recvfrom()
114             for (size_t msgLenReceived = 0; (msgLenReceived < msgLen) && (nBytes > 0);  in recvfrom()
115                  msgLenReceived += nBytes) {  in recvfrom()
116                 nBytes = ::recvfrom(sid, &(msg[msgLenReceived]), msg.size() - msgLenReceived,  in recvfrom()
119             if (nBytes > 0) {  in recvfrom()
120                 nBytes = msgLen;  in recvfrom()
121                 dataCb->onReceive(msg.data(), nBytes, &recver);  in recvfrom()
126     return nBytes;  in recvfrom()