/* 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 */

/*
 * ThreadsUIOINTEvent.c
 *
 * This is a clone of ThreadsUIOEvents.c that supports SIGINT
 * CHauser September 12, 1991 5:18:33 pm PDT
 */


#ifndef _XR_THREADS_
#   include "xr/Threads.h"
#endif

#ifndef _XR_THREADS_BACKDOOR_
#   include "xr/ThreadsBackdoor.h"
#endif

#ifndef _XR_UIO_
#   include "xr/UIO.h"
#endif

#ifndef	_XR_UIO_PRIVATE_
#   include "xr/UIOPrivate.h"
#endif

#ifndef _XR_UIO_EVENTS_
#   include "xr/UIOEvents.h"
#endif

#ifndef _XR_ERRNO_
#   include "xr/Errno.h"
#endif


#include <signal.h>


extern struct XR_MLRep XR_iopUIOEventLock;

extern struct XR_CVRep XR_iopUIOEventAvail;




int
XR_UIORegisterInterestInINTEvent(interested)
    bool interested;
{
    struct XR_IOPOrderRep iopo;
    XR_IOPOResult result;
    int ans;
    XR_IOPE iope;
    XR_IOPE iopeLimit = XR_UIOIOPELimit;

    XR_MonitorEntry(&XR_iopUIOEventLock);
    for( iope = XR_uioArea->uioa_iope; iope < iopeLimit; iope++ ) {
        iopo.iopo_eventSigNum = SIGINT;
        iopo.iopo_eventInteresting = interested;
        result = XR_IssueIOPOrder(
                /* iop */	iope,
                /* order */	&iopo,
                /* proc */	XR_RegisterInterestIOPOrderProc,
                /* cancel */	NIL,
                /* abortable */	FALSE,
                /* timeout */	XR_WAIT_FOREVER
        );
        if( result != XR_IOPO_RESULT_OK ) {
            XR_MonitorExit(&XR_iopUIOEventLock);
            XR_SetErrno(EIO);
            return (-1);
        }
        ans = (int)(iopo.iopo_results[0]);
        if( ans < 0 ) {
            XR_MonitorExit(&XR_iopUIOEventLock);
            if( interested )
                (void) XR_UIORegisterInterestInINTEvent(FALSE);
            XR_SetErrno(-ans);
            return (-1);
        }
    }
    XR_MonitorExit(&XR_iopUIOEventLock);
    return 0;
}