/******************************************************************************
*
*  (c) Copyright 1998, University of Karlstad.
*
*  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 1, 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 General Public License
*  along with this program; if not, write to the Free Software
*  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*  Please report any bugs you find in this code or any improvements to:
*
*  Hans Hedbom, Dept. of Computer Science,
*  University of Karlstad, Sweden.
*
*  Phone: +46 54 838157
*  E-mail: Hans.Hedbom@hks.se
* 
*  ============================================================================
*
*  FILE:
*
*  sockets.h [ the Data Communication I course programming project ]
*
*  AUTHORS:
*
*  Jonny Wiederholm
*  E-mail: fr7wied@cse.hks.se or
*          jonnwied@hks.se
*
*  Per-Ola Gustafsson
*  E-mail: fr7gust@cse.hks.se
*
*  CREATION DATE:
*
*  Jan, 06, 1998
*
*  DESCRIPTION:
*
*  Includes constants, types and declarations of functions needed to create
*  and connect sockets in the example implementation of the Data Communication
*  I course programming project.
*
*  MODIFICATIONS:   Date    Changes
*  ----------------------------------------------------------------------------
*
*/

#ifndef _SOCKETS_H    /* Avoid multiple copies of this file. */
#define _SOCKETS_H

#ifdef __cplusplus    /* Make this file possible to use in C++ code. */
extern "C" {
#endif

/******************************************************************************
*  INCLUDE FILES
*/

#include "systems.h"
#include "udefs.h"

/******************************************************************************
*  DEFINE CONSTANTS
*/

#if defined (_AIX) || defined (__linux__)

/* Communication semantics. */
#define SOCK_STREAM  1  /* Stream socket. */

#elif defined (sun)

#define SOCK_STREAM  2

#endif

/* Communication domains. */
#define AF_UNIX      1  /* Local to host (pipes, portals). */
#define AF_INET      2  /* Internetwork: UDP, TCP, etc. */

/******************************************************************************
*  DEFINE TYPES
*/

#if defined (__linux__) || defined (sun)

/* Structure used by kernel to store most addresses. */
struct sockaddr {
   unsigned short int  sa_family;    /* Address family AF_xxx. */
   char                sa_data[14];  /* 14 bytes of protocol address. */
};

#elif defined (_AIX)

struct sockaddr {
   unsigned char  sa_len;       /* Total length. */
   unsigned char  sa_family;    /* Address family AF_xxx. */
   char           sa_data[14];  /* 14 bytes of protocol address. */
};

#endif                  /* defined (__linux__) || defined (sun) */

/*****************************************************************************
*  DECLARE FUNCTIONS
*/

/* See function definitions for documentation. */

extern int CreateSocket __P((int domain, int type, int protocol));
extern int BindSocket __P((int sockfd, struct sockaddr *name, int namelen));
extern int ConnectSocket __P((int sockfd, struct sockaddr *name, int namelen));
extern int ListenforConnection __P((int sockfd, int limit));
extern int AcceptConnection __P((int sockfd));

/******************************************************************************
*  END
*/

#ifdef __cplusplus
}
#endif

#endif                  /* _SOCKETS_H */