我在考虑使用Boost Asio从Socket CAN中读取数据。 在linux/can.h中没有什么花哨的东西,设备应该像环回接口一样运行,并使用原始套接字。
看着basic_raw_socket
接口,似乎我可以利用basic_raw_socket::assign来分配使用原生套接字创建的套接字。
socket( PF_CAN, SOCK_RAW, CAN_RAW );
这是我目前的进展
namespace can {
class CanSocket {
public:
typedef boost::asio::ip::basic_endpoint<CanSocket> endpoint;
typedef boost::asio::ip::basic_resolver_query<CanSocket> resolver_query;
typedef boost::asio::ip::basic_resolver_iterator<CanSocket> resolver_iterator;
typedef boost::asio::basic_raw_socket<CanSocket> socket;
typedef boost::asio::ip::basic_resolver<CanSocket> resolver;
CanSocket()
: _protocol( CAN_RAW )
, _family( PF_CAN )
{
}
static CanSocket v4()
{
return CanSocket();
}
static CanSocket v6();
int type() const;
int protocol() const;
int family() const;
friend bool operator==(const CanSocket& p1, const CanSocket& p2)
{
return p1._protocol != p2._protocol || p1._family != p2._family;
}
friend bool operator!=(const CanSocket& p1, const CanSocket& p2)
{
return p1._protocol == p2._protocol || p1._family == p2._family;
}
private:
int _protocol;
int _family;
};
}
这是我在我的应用程序中使用它的方式。
boost::asio::io_service ioserv;
CanSocket::socket s( ioserv );
int sock = socket( PF_CAN, SOCK_RAW, CAN_RAW );
s.assign(CanSocket::v4(), sock);
struct ifreq ifr;
strcpy(ifr.ifr_name, "vcan0");
ioctl(sock, SIOCGIFINDEX, &ifr); /* ifr.ifr_ifindex gets filled
* with that device's index */
/* Select that CAN interface, and bind the socket to it. */
/* this should be the endpoint */
struct sockaddr_can addr;
addr.can_family = AF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
/* s.bind (....) */
bind( sock, (struct sockaddr*)&addr, sizeof(addr) );
我不太明白的是如何将
s
与本地端点bind起来?没有涉及到IP或端口。除了端点之外,还需要实现其他内容吗?