Experimental Physics and Industrial Control System
Dear Sirs,
I am working under vxWorks 5.3 with EPICS 3.13 (PC VERSION, which is from "Kay
[email protected]") and have got some errors, such as "page fault"
with some tasks.
Seems these errors only happen when you use the version 5.3 vxWorks.
I have found the reason and here reports my modifications:
1. crash with rsrv_init(), which is invoked by iocInit()
file: ./src/rsrv/rsrv_init.c
crash with vxworks function: errnoOfTaskGet(taskId) if taskId = -1
the errnoOfTaskGet() calls _taskTcb() and if taskId is wrong
it will cause Page Fault.
wrong:
#define DELETE_TASK(TID)\
if(errnoOfTaskGet(TID)!=ERROR)taskDelete(TID);
corrected:
#define DELETE_TASK(TID)\
if(TID >= 0 && errnoOfTaskGet(TID)!=ERROR)taskDelete(TID);
Remark: DELETE_TASK should check TID, if not -1 then go on.
2. page fault with db scan task if no record uses its scan period
File: ./src/db/dbScan.c
function: scanList()
error: page fault with scan task if no records using this period
reason: get 'next' when pse==NULL
corrected: (line 598)
if( pse != NULL) next = (scan_element *)ellNext((void *)pse);
3. Page Fault with spawn task req_server() in caservertask.c
file: ./src/rsrv/caservertask.c
wrong:
accept( IOCK_sock, NULL, 0 )
corrected:
struct sockaddr sockAddr;
int addLen = sizeof( sockAddr );
accept( IOCK_sock, &sockAddr, &addLen)
Remark: accept() can not use NULL address pointer.
Now the ca is working correctly.
Best wishes,
-Cai, Mingfu (DESY-MKS2)
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