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tmk_keyboard/tool/mbed/mbed-sdk/libraries/net/lwip/Socket/UDPSocket.cpp

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/* Copyright (C) 2012 mbed.org, MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute,
* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "Socket/UDPSocket.h"
#include <cstring>
using std::memset;
UDPSocket::UDPSocket() {
}
int UDPSocket::init(void) {
return init_socket(SOCK_DGRAM);
}
// Server initialization
int UDPSocket::bind(int port) {
if (init_socket(SOCK_DGRAM) < 0)
return -1;
struct sockaddr_in localHost;
std::memset(&localHost, 0, sizeof(localHost));
localHost.sin_family = AF_INET;
localHost.sin_port = htons(port);
localHost.sin_addr.s_addr = INADDR_ANY;
if (lwip_bind(_sock_fd, (const struct sockaddr *) &localHost, sizeof(localHost)) < 0) {
close();
return -1;
}
return 0;
}
int UDPSocket::join_multicast_group(const char* address) {
struct ip_mreq mreq;
// Set up group address
mreq.imr_multiaddr.s_addr = inet_addr(address);
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
return set_option(IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
}
int UDPSocket::set_broadcasting(bool broadcast) {
int option = (broadcast) ? (1) : (0);
return set_option(SOL_SOCKET, SO_BROADCAST, &option, sizeof(option));
}
// -1 if unsuccessful, else number of bytes written
int UDPSocket::sendTo(Endpoint &remote, char *packet, int length) {
if (_sock_fd < 0)
return -1;
if (!_blocking) {
TimeInterval timeout(_timeout);
if (wait_writable(timeout) != 0)
return 0;
}
return lwip_sendto(_sock_fd, packet, length, 0, (const struct sockaddr *) &remote._remoteHost, sizeof(remote._remoteHost));
}
// -1 if unsuccessful, else number of bytes received
int UDPSocket::receiveFrom(Endpoint &remote, char *buffer, int length) {
if (_sock_fd < 0)
return -1;
if (!_blocking) {
TimeInterval timeout(_timeout);
if (wait_readable(timeout) != 0)
return 0;
}
remote.reset_address();
socklen_t remoteHostLen = sizeof(remote._remoteHost);
return lwip_recvfrom(_sock_fd, buffer, length, 0, (struct sockaddr*) &remote._remoteHost, &remoteHostLen);
}