/*  $Id$

    Part of SWI-Prolog

    Author:        Jan Wielemaker
    E-mail:        wielemak@science.uva.nl
    WWW:           http://www.swi-prolog.org
    Copyright (C): 1985-2007, University of Amsterdam

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

    As a special exception, if you link this library with other files,
    compiled with a Free Software compiler, to produce an executable, this
    library does not by itself cause the resulting executable to be covered
    by the GNU General Public License. This exception does not however
    invalidate any other reasons why the executable file might be covered by
    the GNU General Public License.
*/

#ifndef H_NONBLOCKIO_INCLUDED
#define H_NONBLOCKIO_INCLUDED


		 /*******************************
		 *     GET REQUIRED HEADERS	*
		 *******************************/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <SWI-Stream.h>
#include <SWI-Prolog.h>

#ifdef __WINDOWS__

#include <io.h>
#include <winsock2.h>
#include <ws2tcpip.h>

#else /*__WINDOWS__*/

#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
#ifdef HAVE_H_ERRNO
extern int h_errno;
#else
#define h_errno errno
#endif
#ifndef HAVE_SOCKLEN_T
#define socklen_t size_t
#endif

typedef int SOCKET;

#endif /*__WINDOWS__*/

typedef enum
{ TCP_ERRNO,
  TCP_HERRNO
} nbio_error_map;

typedef enum				/* nbio_setopt() commands */
{ TCP_NONBLOCK,
  TCP_REUSEADDR,
  TCP_NO_DELAY,
  TCP_DISPATCH,
  TCP_INSTREAM,
  TCP_OUTSTREAM,
  UDP_BROADCAST,
  NBIO_END
} nbio_option;

typedef enum
{ REQ_NONE = 0,				/* no request pending */
  REQ_ACCEPT,
  REQ_CONNECT,
  REQ_READ,
  REQ_WRITE,
  REQ_RECVFROM,
  REQ_SENDTO
} nbio_request;

					/* nbio_get_flags() mask */
#define PLSOCK_INSTREAM	  0x001
#define PLSOCK_OUTSTREAM  0x002
#define PLSOCK_BIND	  0x004		/* What have we done? */
#define PLSOCK_LISTEN	  0x008
#define PLSOCK_CONNECT	  0x010
#define PLSOCK_ACCEPT	  0x020		/* Set on accepted sockets */
#define PLSOCK_NONBLOCK	  0x040		/* Set to non-blocking mode */
#define PLSOCK_DISPATCH   0x080		/* do not dispatch events */
#define PLSOCK_CLOSE_SEEN 0x100		/* FD_CLOSE seen */
#define PLSOCK_EOF_SEEN   0x200		/* Seen end-of-file */
#define PLSOCK_WAITING	  0x400		/* using nbio_wait() */


typedef int	nbio_sock_t;		/* socket handle (not a file-descr) */
typedef struct _plsocket *plsocket_ptr;	/* wrapped socket */

		 /*******************************
		 *	 BASIC FUNCTIONS	*
		 *******************************/

#ifdef HAVE_DECLSPEC
#define NBIO_EXPORT(type)		__declspec(dllexport) type
#else
#define NBIO_EXPORT(type)	 	extern type
#endif

NBIO_EXPORT(int)	nbio_init(const char *module);
NBIO_EXPORT(int)	nbio_cleanup(void);
NBIO_EXPORT(int)	nbio_debug(int level);

NBIO_EXPORT(nbio_sock_t)
		nbio_socket(int domain, int type, int protocol);
NBIO_EXPORT(int)	nbio_connect(nbio_sock_t socket,
			     const struct sockaddr *serv_addr,
			     size_t addrlen);
NBIO_EXPORT(int)	nbio_bind(nbio_sock_t socket,
			  struct sockaddr *my_addr,
			  size_t addrlen);
NBIO_EXPORT(int)	nbio_listen(nbio_sock_t socket, int backlog);
NBIO_EXPORT(nbio_sock_t)
		nbio_accept(nbio_sock_t master,
			    struct sockaddr *addr,
			    socklen_t *addrlen);

extern ssize_t	nbio_read(nbio_sock_t socket, char *buf, size_t bufSize);
extern ssize_t 	nbio_write(nbio_sock_t socket, char *buf, size_t bufSize);
NBIO_EXPORT(int) nbio_closesocket(nbio_sock_t socket);
extern int 	nbio_close_input(nbio_sock_t socket);
extern int 	nbio_close_output(nbio_sock_t socket);
extern ssize_t	nbio_recvfrom(int socket, void *buf, size_t bufSize, int flags,
			      struct sockaddr *from, socklen_t *fromlen);
extern ssize_t	nbio_sendto(nbio_sock_t socket, void *buf, size_t bufSize, int flags,
			    const struct sockaddr *to, socklen_t tolen);

NBIO_EXPORT(int)	nbio_wait(nbio_sock_t socket, nbio_request);
NBIO_EXPORT(SOCKET)	nbio_fd(nbio_sock_t socket);
extern int	nbio_select(int n,
			    fd_set *readfds,
			    fd_set *writefds,
			    fd_set *exceptfds,
			    struct timeval *timeout);

extern int	nbio_unify_ip4(term_t ip4, unsigned long hip);
extern int	nbio_get_ip(term_t ip4, struct in_addr *ip);

extern int	nbio_error(int code, nbio_error_map map);
extern const char*
		nbio_last_error(nbio_sock_t socket);
NBIO_EXPORT(int)	nbio_setopt(int socket, nbio_option opt, ...);
extern int	nbio_get_flags(int socket);

					/* support tipc_setopt() */
extern plsocket_ptr
		nbio_to_plsocket(nbio_sock_t socket);
extern SOCKET	plsocket_handle(plsocket_ptr s);


		 /*******************************
		 *	    CONVERSION		*
		 *******************************/

extern int	nbio_get_sockaddr(term_t Address,
				  struct sockaddr_in *addr);
extern int	nbio_get_ip4(term_t ip4, struct in_addr *ip);

#endif /*H_NONBLOCKIO_INCLUDED*/
