flags.h

用于嵌入式系统的TCP/IP协议栈及若干服务

/*
*            Copyright (c) 1998-2001 by NETsilicon Inc.
*
*  This software is copyrighted by and is the sole property of
*  NETsilicon.  All rights, title, ownership, or other interests
*  in the software remain the property of NETsilicon.  This
*  software may only be used in accordance with the corresponding
*  license agreement.  Any unauthorized use, duplication, transmission,
*  distribution, or disclosure of this software is expressly forbidden.
*
*  This Copyright notice may not be removed or modified without prior
*  written consent of NETsilicon.
*
*  NETsilicon, reserves the right to modify this software
*  without notice.
*
*  NETsilicon
*  411 Waverley Oaks Road                  USA 781.647.1234
*  Suite 227                               http://www.netsilicon.com
*  Waltham, MA 02452                       [e-mail]
*
*************************************************************************
*  $Name: Fusion 6.52 Fusion 6.51 $
*  $Date: 2001/09/20 10:19:17 $
*  $Source: M:/psisrc/stack/incl/rcs/flags.h $
*  $Revision: 1.7 $
**************************************************************************
*  File Description:  Definitions and Macros for dealing with common
*                     flags (which apply to sockets)
**************************************************************************/

#ifndef _FLAGS_
#define _FLAGS_

#include "config.h"
#include "ccdep.h"

/* flags reserved in all common flag fields */

#define F_BLOCKING      MSG_BLOCKING    /* transaction can block */
#define F_NONBLOCKING   MSG_NONBLOCKING /* transaction cannot block */
#define F_FDBROADCAST   MSG_FDBROADCAST /* want full duplex broadcasts */

/* blocking / status is a tri-state thing: F_BLOCKING means we want
 * a status back and are willing and able to sleep; F_NONBLOCKING means
 * we want a status back immediately without sleeping; neither of these
 * means we don't care to see a status back, allowing queueing of processing
 * at appropriate places.
 */

#define F_BS_MASK       (F_BLOCKING|F_NONBLOCKING)
#define F_COMM_MASK     (F_BS_MASK | F_FDBROADCAST)
#define give_bs(f)      ((f)&F_BS_MASK)
#define no_bs(f)        bC2((f),F_BLOCKING,F_NONBLOCKING)
#define F_NOBS          0               /* for clarity */

#define can_block(flags)        bT1((flags),F_BLOCKING)
#define cant_block(flags)       bF1((flags),F_BLOCKING)
#define want_status(flags)      (!bF2((flags),F_BLOCKING,F_NONBLOCKING))

#endif  /*_FLAGS_*/