Socket.cpp

00001 /* Copyright (C) 2012 mbed.org, MIT License
00002  *
00003  * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004  * and associated documentation files (the "Software"), to deal in the Software without restriction,
00005  * including without limitation the rights to use, copy, modify, merge, publish, distribute,
00006  * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
00007  * furnished to do so, subject to the following conditions:
00008  *
00009  * The above copyright notice and this permission notice shall be included in all copies or
00010  * substantial portions of the Software.
00011  *
00012  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013  * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017  */
00018 #include "Socket/Socket.h"
00019 #include <cstring>
00020 
00021 using std::memset;
00022 
00023 Socket::Socket() : _sock_fd(-1) {
00024     
00025 }
00026 
00027 int Socket::init_socket(int type) {
00028     if (_sock_fd != -1)
00029         return -1;
00030     
00031     int fd = lwip_socket(AF_INET, type, 0);
00032     if (fd < 0)
00033         return -1;
00034     
00035     _sock_fd = fd;
00036     return 0;
00037 }
00038 
00039 int Socket::select(struct timeval *timeout, bool read, bool write) {
00040     if ((timeout->tv_sec == 0) && (timeout->tv_usec == 0))
00041         return 0;
00042     
00043     fd_set fdSet;
00044     FD_ZERO(&fdSet);
00045     FD_SET(_sock_fd, &fdSet);
00046     
00047     fd_set* readset  = (read ) ? (&fdSet) : (NULL);
00048     fd_set* writeset = (write) ? (&fdSet) : (NULL);
00049     
00050     int ret = lwip_select(FD_SETSIZE, readset, writeset, NULL, timeout);
00051     return (ret <= 0 || !FD_ISSET(_sock_fd, &fdSet)) ? (-1) : (0);
00052 }
00053 
00054 int Socket::wait_readable(TimeInterval& timeout) {
00055     return select(&timeout._time, true, false);
00056 }
00057 
00058 int Socket::wait_writable(TimeInterval& timeout) {
00059     return select(&timeout._time, false, true);
00060 }
00061 
00062 int Socket::shutdown(int how)
00063 {
00064     if (_sock_fd < 0)
00065         return -1;
00066         
00067     return lwip_shutdown(_sock_fd,how);
00068 }
00069 
00070 int Socket::close() {
00071     if (_sock_fd < 0)
00072         return -1;
00073     
00074     lwip_close(_sock_fd);
00075     _sock_fd = -1;
00076     
00077     return 0;
00078 }
00079 
00080 TimeInterval::TimeInterval(int ms) {
00081     _time.tv_sec = ms / 1000;
00082     _time.tv_usec = (ms - (_time.tv_sec * 1000)) * 1000;
00083 }