Experimental Physics and
Industrial Control System

On 11/4/15 3:09 PM, J. Lewis Muir wrote:
> Hello!
>
> I've got a VxWorks IOC that stops executing st.cmd as follows when it
> tries loading the .munch file:
>
> ---8<---
> cd topbin
> value = 0 = 0x0
> load("17lab.munch")
> Undefined symbol: snprintf (binding 1 type 0)
> ld error: Module contains undefined symbol(s) and may be unusable.
> value = 0 = 0x0
>
> Done executing startup script /ioc/boot/17lab/st.cmd
> 17lab>
> --->8---
>
> Does anyone know what's wrong or how to debug this?

The problem was that autosave 5-6-1 uses snprintf, and (I assume)
VxWorks 5 doesn't have that function.  Attached is a patch to change
snprintf to epicsSnprintf.  With the patch applied, my .munch file loads
successfully.

Thanks to Mark Rivers for helping me track this down!  Following his
suggestion, I was able to search the .a files of all the synApps modules
using nmppc for references to snprintf which led me to the culprit:
autosave.

Lewis

Don't use snprintf because VxWorks 5 does not have it.

--- asApp/src/dbrestore.c.orig	2015-03-04 13:46:17.000000000 -0600
+++ asApp/src/dbrestore.c	2015-11-04 16:24:35.440365068 -0600
@@ -87,6 +87,7 @@
 #include	<epicsExport.h>
 #include	<special.h>
 #include	<macLib.h>
+#include	<epicsStdio.h>
 #include	<epicsString.h>
 #include	<dbAccessDefs.h>
 
@@ -1632,7 +1633,7 @@
 	pitem = (struct buildInfoItem *)ellFirst(&buildInfoList);
 	for (; pitem; pitem = (struct buildInfoItem *)ellNext(&(pitem->node)) ) {
 		if (pitem->enabled) {
-			n = snprintf(requestFileName, MAXSTRING, "%s%s", requestFileBase, pitem->suffix);
+			n = epicsSnprintf(requestFileName, MAXSTRING, "%s%s", requestFileBase, pitem->suffix);
 			if ((n < MAXSTRING) && (openReqFile(requestFileName, NULL))) {
 				if (save_restoreDebug >= 5) {
 					printf("myDbLoadRecordsHook: found '%s'\n", requestFileName);
@@ -1650,7 +1651,7 @@
 						strcpy(macroString, emacroString);
 					}
 				}
-				n = snprintf(requestFileCmd, MAXSTRING, "file %s %s", requestFileName, macroString);
+				n = epicsSnprintf(requestFileCmd, MAXSTRING, "file %s %s", requestFileName, macroString);
 				if (n < MAXSTRING) appendToFile(pitem->filename, requestFileCmd);
 			}
 		}

References:

Undefined symbol error when load VxWorks .much file J. Lewis Muir

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