/* begincopyright
  Copyright (c) 1988 Xerox Corporation. All rights reserved.
  Use and copying of this software and preparation of derivative works based
  upon this software are permitted. Any distribution of this software or
  derivative works must comply with all applicable United States export
  control laws. This software is made available AS IS, and Xerox Corporation
  makes no warranty about the software, its performance or its conformity to
  any specification. Any person obtaining a copy of this software is requested
  to send their name and post office or electronic mail address to:
    PCR Coordinator
    Xerox PARC
    3333 Coyote Hill Rd.
    Palo Alto, CA 94304
  endcopyright */

/*
 * UIOEvents.h
 *
 * Asynchronous UIO events.
 *
 * Demers, March 12, 1990 2:28:20 pm PST
 */

#ifndef _XR_UIO_EVENTS_
#define _XR_UIO_EVENTS_ 1

#ifndef _XR_BASIC_TYPES_
#   include "xr/BasicTypes.h"
#endif


typedef struct XR_UIOEventRep {
    unsigned uioe_seqNum;
    int uioe_iopIndex;
    int uioe_id;		/* UNIX sig num or 0 (missed events) or ... */
    XR_Pointer uioe_info;	/* always NIL for now */
} *XR_UIOEvent;


#define XR_UIO_EVENT_ID_MISSED	0


extern int
XR_UIOAwaitEvent(/*XR_UIOEvent uioe*/);
/*
    Wait (abortably) for next event, or until timeout.
    Return 0 (on success) or (-1) (on ABORT).
*/

extern int
XR_UIORegisterInterestInEvent(/*int id, bool interested*/);
/*
    Register interest in event.
    Return 0 on success, (-1) on failure with XR_Errno() set.
*/

#endif /* _XR_UIO_EVENTS_ */