Re: another problem with multiple SNL

[Dariush Hampai via Tech-talk <tech-talk at aps.anl.gov>]

Hi Mark,

thank you for your fast answer… however, the file stt starts exactly in that wat

program xena_sncscan

%{

#include <math.h>

#include <stdlib.h>

#include <unistd.h>

#include <time.h>

#include <sys/stat.h>

#include <errno.h>

#define MAX_MOTORS 20

#define MAX_DETECTORS 20

FILE *detector_files[MAX_DETECTORS];

char detector_paths[MAX_DETECTORS][512];

}%

/*=================== Declarations =========================*/

option +r;

for both the two different servers… 

talking with Maurizio, to find a possible solution, the array “detector_paths” can be inserted as SNL code (as char/string detector_paths[20][512];), while how can I define the "FILE *detector_files[MAX_DETECTORS];” outside the “C” environment? It seems that the pointer in one server is in common with all the state machines and in the second server the pointers are “local” and not in common.

awaiting your reply

Dariush

************************************

Dr. Dariush Hampai, PhD

INFN - LNF
X-Lab Frascati
Via E. Fermi, 54 (ex 40)
I-00044 Frascati (RM)
Italy

Mail Address:

XLab-Frascati

LNF-INFN

Casella Postale 13

Frascati (RM)

Italy

Room: +39.06.9403.5248
Lab.: +39.06.9403.2286
Mob.: +39.06.9403.8025
Fax.: +39.06.9403.2597

************************************

Il giorno 3 feb 2026, alle ore 18:35, Mark Rivers <rivers at cars.uchicago.edu> ha scritto:

You need to add this line to the start of your state program so that global symbols do not conflict. 

option +r;

Here is a real-world example:

https://github.com/epics-modules/measComp/blob/0db360662e2d578c12de203adf1ea29eec416d47/measCompApp/src/USBCTR_SNL.st#L11

Mark

---

From: Dariush Hampai <dariush.hampai at lnf.infn.it>
Sent: Tuesday, February 3, 2026 10:36 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Cc: Mark Rivers <rivers at cars.uchicago.edu>; Maurizio M. <maurizio.montis at lnl.infn.it>
Subject: another problem with multiple SNL

 

Dear Community;
I'm trying to make three different state machine (SNL) in the same IOC.
The st.cmd is
< envPaths

cd "${TOP}"

## Register all support components
dbLoadDatabase "dbd/scan.dbd"
scan_registerRecordDeviceDriver pdbbase

## Load record instances
dbLoadRecords("db/scan.db","user=xena,server=xlabsrv2")
dbLoadRecords("db/scan.db","user=rxr,server=xlabsrv2")
dbLoadRecords("db/scan.db","user=cts,server=xlabsrv2")
#dbLoadTemplate("db/scan.val","user=xlabsrv2")

cd "${TOP}/iocBoot/${IOC}"
iocInit

## Start any sequence programs
seq xena_sncscan,"user=xena,server=xlabsrv2"
seq rxr_sncscan,"user=rxr,server=xlabsrv2"
seq cts_sncscan,"user=cts,server=xlabsrv2"

so it should be run three different SNLs. In one server it works 
properly, however in a different server during the make I receive this 
error message:

/usr/bin/ld: 
rxr_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x86_64/../rxr_sncscan.stt:25:
multiple definition of `detector_files'; 
xena_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x./xena_sncscan.stt:25:
first defined here
/usr/bin/ld: 
rxr_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x86_64/../rxr_sncscan.stt:26:
multiple definition of `detector_paths'; 
xena_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x./xena_sncscan.stt:26:
first defined here
/usr/bin/ld: 
cts_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x86_64/../cts_sncscan.stt:25:
multiple definition of `detector_files'; 
xena_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x./xena_sncscan.stt:25:
first defined here
/usr/bin/ld: 
cts_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x86_64/../cts_sncscan.stt:26:
multiple definition of `detector_paths'; 
xena_sncscan.o:/home/xlabsrv2/epics/IOCs/scan/scanApp/src/O.linux-x./xena_sncscan.stt:26:
first defined here

the versions of the two servers are absolutely equal (I copied the 
version from one to another), however in one server I have this error...
What am i wrong?
Thank you in advance

Dariush

-- 
************************************

Dr. Dariush Hampai, PhD

INFN - LNF
X-Lab Frascati
Via E. Fermi, 54 (ex 40)
I-00044 Frascati (RM)
Italy

Mail Address:
XLab-Frascati
LNF-INFN
Casella Postale 13
Frascati (RM)
Italy

Room:   +39.06.9403.5248
Lab.:   +39.06.9403.2286
Mob.:   +39.06.9403.8025
Fax.:   +39.06.9403.2597

************************************