LuaJIT socket wrapper

if not ffi then ffi = require("ffi") end

INVALID_SOCKET_ = -1
SOL_SOCKET = 0xFFFF
INADDR_NONE_ = 0xFFFFFFFF

if jit.os == "Windows" then
    FIONREAD = 0x4004667F
    sock = ffi.load("ws2_32")
elseif jit.os == "MacOS" then
    FIONREAD = 0x4004667F
    sock = ffi.load("sys/socket.h")
elseif jit.os == "Linux" then
    FIONREAD = 0x0000541B
    sock = ffi.load("sys/socket.h")
end

ffi.cdef [[
    typedef uint16_t u_short;
    typedef uint32_t u_int;
    typedef unsigned long u_long;
    typedef uintptr_t SOCKET;
    typedef struct fd_set {u_int fd_count;SOCKET  fd_array[64];} fd_set;
    u_long htonl(u_long hostlong);
    u_short ntohs(u_short netshort);
    u_long ntohl(u_long netlong);
    unsigned long inet_addr(const char* cp);
    char* inet_ntoa(struct in_addr in);
    SOCKET socket(int af, int type, int protocol);
    SOCKET accept(SOCKET s,struct sockaddr* addr,int* addrlen);
    int bind(SOCKET s, const struct sockaddr* name, int namelen);
    int closesocket(SOCKET s);
    int connect(SOCKET s, const struct sockaddr * name, int namelen);
    int getsockname(SOCKET s, struct sockaddr* name, int* namelen);
    int ioctlsocket(SOCKET s, long cmd, u_long* argp);
    int listen(SOCKET s, int backlog);
    int recv(SOCKET s, char* buf, int len, int flags);
    int recvfrom(SOCKET s, char* buf, int len, int flags, struct sockaddr* from, int* fromlen);
    int select(int nfds, fd_set* readfds, fd_set* writefds, fd_set* exceptfds, const struct timeval* timeout);
    int send(SOCKET s, const char* buf, int len, int flags);
    int sendto(SOCKET s, const char* buf, int len, int flags, const struct sockaddr* to, int tolen);
    int setsockopt(SOCKET s, int level, int optname, const char* optval, int optlen);
    int shutdown(SOCKET s, int how);
    struct hostent* gethostbyname(const char* name);
]]

print(type(sock.sendto))