writing to aao crashes ioc

[Dirk Zimoch <dirk.zimoch@psi.ch>]

Hi all,

When an aao is written by an other record, the ioc crashes. The problem 
seems to independent of the DTYP of the aao. I used an (unofficial) Soft 
Channel support (attached).

Example db:

record (aao, "aao1")
{
    field (FTVL, "DOUBLE")
    field (NELM, "10")
    field (OUT,  "aao2")
}

record (aao, "aao2")
{
    field (FTVL, "DOUBLE")
    field (NELM, "10")
}

record (ao, "ao1")
{
    field (OUT,  "aao2")
}

When I write aao1 or ao1 the IOC crashes. (Note that aao2 is not even 
processed in that case.) If I write directly into aao2 there is no problem.

Any idea?

I am using EPICS R3.14.8.2.


Dirk
/*************************************************************************\
* Copyright (c) 2003 SLS Swiss Light Source
* based upon waveform support
\*************************************************************************/

/*************************************************************************\
* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
*     National Laboratory.
* Copyright (c) 2002 The Regents of the University of California, as
*     Operator of Los Alamos National Laboratory.
* EPICS BASE Versions 3.13.7
* and higher are distributed subject to a Software License Agreement found
* in file LICENSE that is included with this distribution. 
\*************************************************************************/
/* devAaoSoft.c */

/* devAaoSoft.c - Device Support Routines for soft Waveform Records*/
/*
 *      Original Author: Bob Dalesio
 *      Current Author:  Dirk Zimoch
 *      Date:            11-JUL-2003
 */


#include	<stdlib.h>
#include	<stdio.h>
#include	<string.h>

#include	"alarm.h"
#include	"dbDefs.h"
#include	"dbAccess.h"
#include	"recGbl.h"
#include        "recSup.h"
#include	"devSup.h"
#include	"link.h"
#include	"aaoRecord.h"
#include	"epicsExport.h"

/* Create the dset for devAaoSoft */
static long init_record();
static long write_aao();
struct {
	long		number;
	DEVSUPFUN	report;
	DEVSUPFUN	init;
	DEVSUPFUN	init_record;
	DEVSUPFUN	get_ioint_info;
	DEVSUPFUN	read_aao;
} devAaoSoft = {
	5,
	NULL,
	NULL,
	init_record,
	NULL,
	write_aao
};
        
epicsExportAddress(dset,devAaoSoft);


static int sizeofTypes[] = {MAX_STRING_SIZE,1,1,2,2,4,4,4,8,2};

static long init_record(aaoRecord *paao)
{
    /* aao record does not allocate bptr. Why not? */
    if (!paao->bptr) {
    	if(paao->ftvl>DBF_ENUM) paao->ftvl=2;
    	paao->bptr = (char *)calloc(paao->nelm,sizeofTypes[paao->ftvl]);
    }
	
    /* aao.out must be a CONSTANT or a PV_LINK or a DB_LINK or a CA_LINK*/
    switch (paao->out.type) {
    case (CONSTANT) :
	paao->nord = 0;
	break;
    case (PV_LINK) :
    case (DB_LINK) :
    case (CA_LINK) :
	break;
    default :
	recGblRecordError(S_db_badField,(void *)paao,
		"devAaoSoft (init_record) Illegal INP field");
	return(S_db_badField);
    }
    return(0);
}

static long write_aao(aaoRecord *paao)
{
    long status,nRequest;

    nRequest=paao->nelm;
    /* aao record can not handle simulation mode. Why not? */
    if (paao->simm == YES){
        recGblRecordError(S_db_badField,(void *)paao,
		"devAaoSoft (read_aao) simulation mode unsupported");
        return(S_db_badField);
    }
    status = dbPutLink(&paao->out,paao->ftvl,paao->bptr, nRequest);
    /*If dbGetLink got no values leave things as they were*/
    if(nRequest>0) paao->nord = nRequest;

    return(0);
}