socket.h

本人收集整理的一份c/c++跨平台网络库

#ifndef UTILS_BASE_SOCKET_H_
#define UTILS_BASE_SOCKET_H_

#include <errno.h>

#ifdef POSIX
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define SOCKET_EACCES EACCES
#endif

#ifdef WIN32
#include "win32.h"
#endif

#include "basictypes.h"
#include "socketaddress.h"

// Rather than converting errors into a private namespace,
// Reuse the POSIX socket api errors. Note this depends on
// Win32 compatibility.

#ifdef WIN32
#define EWOULDBLOCK WSAEWOULDBLOCK
#define EINPROGRESS WSAEINPROGRESS
#define EALREADY WSAEALREADY
#define ENOTSOCK WSAENOTSOCK
#define EDESTADDRREQ WSAEDESTADDRREQ
#define EMSGSIZE WSAEMSGSIZE
#define EPROTOTYPE WSAEPROTOTYPE
#define ENOPROTOOPT WSAENOPROTOOPT
#define EPROTONOSUPPORT WSAEPROTONOSUPPORT
#define ESOCKTNOSUPPORT WSAESOCKTNOSUPPORT
#define EOPNOTSUPP WSAEOPNOTSUPP
#define EPFNOSUPPORT WSAEPFNOSUPPORT
#define EAFNOSUPPORT WSAEAFNOSUPPORT
#define EADDRINUSE WSAEADDRINUSE
#define EADDRNOTAVAIL WSAEADDRNOTAVAIL
#define ENETDOWN WSAENETDOWN
#define ENETUNREACH WSAENETUNREACH
#define ENETRESET WSAENETRESET
#define ECONNABORTED WSAECONNABORTED
#define ECONNRESET WSAECONNRESET
#define ENOBUFS WSAENOBUFS
#define EISCONN WSAEISCONN
#define ENOTCONN WSAENOTCONN
#define ESHUTDOWN WSAESHUTDOWN
#define ETOOMANYREFS WSAETOOMANYREFS
#define ETIMEDOUT WSAETIMEDOUT
#define ECONNREFUSED WSAECONNREFUSED
#define ELOOP WSAELOOP
#undef ENAMETOOLONG // remove errno.h's definition
#define ENAMETOOLONG WSAENAMETOOLONG
#define EHOSTDOWN WSAEHOSTDOWN
#define EHOSTUNREACH WSAEHOSTUNREACH
#undef ENOTEMPTY // remove errno.h's definition
#define ENOTEMPTY WSAENOTEMPTY
#define EPROCLIM WSAEPROCLIM
#define EUSERS WSAEUSERS
#define EDQUOT WSAEDQUOT
#define ESTALE WSAESTALE
#define EREMOTE WSAEREMOTE
#undef EACCES
#define SOCKET_EACCES WSAEACCES
#endif // WIN32

#ifdef POSIX
#define INVALID_SOCKET (-1)
#define SOCKET_ERROR (-1)
#define closesocket(s) close(s)
#endif // POSIX

namespace utils_base {

inline bool IsBlockingError(int e) {
  return (e == EWOULDBLOCK) || (e == EAGAIN) || (e == EINPROGRESS);
}

// General interface for the socket implementations of various networks.  The
// methods match those of normal UNIX sockets very closely.
class Socket {
public:
  virtual ~Socket() {}
 
  // Returns the address to which the socket is bound.  If the socket is not
  // bound, then the any-address is returned.
  virtual SocketAddress GetLocalAddress() const = 0;

  // Returns the address to which the socket is connected.  If the socket is
  // not connected, then the any-address is returned.
  virtual SocketAddress GetRemoteAddress() const = 0;

  virtual int Bind(const SocketAddress& addr) = 0;
  virtual int Connect(const SocketAddress& addr) = 0;
  virtual int Send(const void *pv, size_t cb) = 0;
  virtual int SendTo(const void *pv, size_t cb, const SocketAddress& addr) = 0;
  virtual int Recv(void *pv, size_t cb) = 0;
  virtual int RecvFrom(void *pv, size_t cb, SocketAddress *paddr) = 0;
  virtual int Listen(int backlog) = 0;
  virtual Socket *Accept(SocketAddress *paddr) = 0;
  virtual int Close() = 0;
  virtual int GetError() const = 0;
  virtual void SetError(int error) = 0;
  inline bool IsBlocking() const { return IsBlockingError(GetError()); }

  enum ConnState {
    CS_CLOSED,
    CS_CONNECTING,
    CS_CONNECTED
  };
  virtual ConnState GetState() const = 0;

  // Fills in the given uint16 with the current estimate of the MTU along the
  // path to the address to which this socket is connected.
  virtual int EstimateMTU(uint16* mtu) = 0;

  enum Option {
    OPT_DONTFRAGMENT
  };
  virtual int SetOption(Option opt, int value) = 0;

protected:
  Socket() {}

private:
  DISALLOW_EVIL_CONSTRUCTORS(Socket);
};

} // namespace utils_base

#endif // UTILS_BASE_SOCKET_H_