Source to bsd/netat/adsp_NewCID.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* 
 * dspNewCID.c 
 *
 * From v01.04 04/20/90 mbs
 *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
 */

#include <sys/errno.h>
#include <sys/types.h>
#include <sys/param.h>
#include <machine/spl.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/fcntl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>

#include <netat/sysglue.h>
#include <netat/appletalk.h>
#include <netat/at_pcb.h>
#include <netat/debug.h>
#include <netat/adsp.h>
#include <netat/adsp_internal.h>

/*
 * dspNewCID
 * 
 * INPUTS:
 * 	--> ccbRefNum		refnum of connection end
 *
 * OUTPUTS:
 *	<-- newCID		new connection identifier
 *
 * ERRORS:
 *	errRefNum		bad connection refnum
 *	errState		connection is not closed
 */
int adspNewCID(sp, pb)		/* (DSPPBPtr pb) */
    CCBPtr		sp;
    struct adspcmd *pb;
{
    if (sp == 0) {
	pb->ioResult = errRefNum;
	return EINVAL;
    }

    if (sp->state != sClosed) {	/* Can only assign to a closed connection */
	pb->ioResult = errState;
	return EINVAL;
    }

    /*
     * Assign a unique connection ID to this ccb
     */
    sp->locCID = pb->u.newCIDParams.newcid = NextCID();

    pb->ioResult = 0;
    adspioc_ack(0, pb->ioc, pb->gref);
    return 0;
}