/*
 *  libsocket - BSD socket like library for DJGPP
 *  Copyright 1997, 1998 by Indrek Mandre
 *  Copyright 1997-2000 by Richard Dawe
 *
 *  Portions of libsocket Copyright 1985-1993 Regents of the University of 
 *  California.
 *  Portions of libsocket Copyright 1991, 1992 Free Software Foundation, Inc.
 *  Portions of libsocket Copyright 1997, 1998 by the Regdos Group.
 *
 *  This library is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Library General Public License as published
 *  by the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This library 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
 *  Library General Public License for more details.
 * 
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <string.h>

#include <sys/socket.h>

#include <lsck/lsck.h>
#include <lsck/if.h>

/* ------------
 * - shutdown -
 * ------------ */

int shutdown (int s, int how)
{
	LSCK_SOCKET *lsd;
	int ret;

	/* Find the socket descriptor */
	lsd = __fd_to_lsd (s);

	if (lsd == NULL) {
		isfdtype(s, S_IFSOCK);
		return (-1);
	}

	/* Check for completion of outstanding non-blocking I/O */
	if (lsd->interface->nonblocking_check != NULL)
		lsd->interface->nonblocking_check (lsd);
	
	/* Is the socket connected? */
	if (!lsd->connected) {
		errno = ENOTCONN;
		return(-1);
	}

	/* Do we have a valid value of how? */
	switch(how) {
	case SHUT_RD:
	case SHUT_WR:
	case SHUT_RDWR:
		break;

	default:
		errno = EINVAL;
		return(-1);
	}

	/* Use appropriate interface */
	if (lsd->interface->shutdown == NULL) {
		errno = EOPNOTSUPP;
		return (-1);
	}
	ret = lsd->interface->shutdown (lsd, how);

	/* Changes the flags here rather than in the interface code */
	if (ret == 0) {
		switch(how) {
		case SHUT_RD:
			lsd->inbound = 0;
			break;
			
		case SHUT_WR:
			lsd->outbound = 0;
			break;

		case SHUT_RDWR:
			lsd->inbound = lsd->outbound = 0;
			break;
		}
	}

	return (ret);
}