From 359cac2a7aee2ef609207edbebcc7992d781d8bc Mon Sep 17 00:00:00 2001
From: Andrew Johnson <anj@aps.anl.gov>
Date: Fri, 6 Apr 2001 15:22:17 +0000
Subject: [PATCH] Don't crash if no hardware present...

---
 src/dev/apsDev/devApsEr.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/dev/apsDev/devApsEr.c b/src/dev/apsDev/devApsEr.c
index d7713b69c..af5c22826 100644
--- a/src/dev/apsDev/devApsEr.c
+++ b/src/dev/apsDev/devApsEr.c
@@ -602,8 +602,11 @@ STATIC long ErEpicsEventInit(struct eventRecord *pRec)
  ******************************************************************************/
 STATIC long ErEpicsEventGetIoScan(int cmd, struct eventRecord *pRec, IOSCANPVT *pPvt)
 {
-  *pPvt = *((IOSCANPVT*)(pRec->dpvt));
-  return(0);
+  if (pRec->dpvt) {
+      *pPvt = *((IOSCANPVT*)(pRec->dpvt));
+      return(0);
+  }
+  return TRUE; /* No hardware */
 }
 ErDsetStruct devErEpicsEvent={5, NULL, NULL, ErEpicsEventInit, ErEpicsEventGetIoScan, NULL};