Socket.hh

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#ifndef SOCKET_HH
#define SOCKET_HH
 
#include <cassert>
#include <cstddef>
#include <string>
 
#ifndef _WIN32
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <unistd.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
 
namespace openmsx {
 
#ifndef _WIN32
inline constexpr int OPENMSX_INVALID_SOCKET = -1;
inline constexpr int SOCKET_ERROR = -1;
using SOCKET = int;
using socklen_t = int;
#else
// INVALID_SOCKET is #defined as  (SOCKET)(~0)
// but that gives a old-style-cast warning
static const SOCKET OPENMSX_INVALID_SOCKET = static_cast<SOCKET>(~0);
using in_addr_t =  UINT32;
#endif
 
[[nodiscard]] std::string sock_error();
void sock_close(SOCKET sd);
[[nodiscard]] ptrdiff_t sock_recv(SOCKET sd, char* buf, size_t count);
[[nodiscard]] ptrdiff_t sock_send(SOCKET sd, const char* buf, size_t count);
 
 
// Activate the socket subsystem (required on Windows)
void sock_startup(); // should only be called via SockActivator
void sock_cleanup();
 
struct SocketActivator
{
        SocketActivator(const SocketActivator&) = delete;
        SocketActivator(SocketActivator&&) = delete;
        SocketActivator& operator=(const SocketActivator&) = delete;
        SocketActivator& operator=(SocketActivator&&) = delete;
 
        SocketActivator()
        {
                if (counter == 0) {
                        sock_startup();
                }
                ++counter;
        }
 
        ~SocketActivator()
        {
                assert(counter > 0);
                --counter;
                if (counter == 0) {
                        sock_cleanup();
                }
        }
 
private:
        static inline int counter = 0;
};
 
} // namespace openmsx
 
#endif