Fix segfault when calling dbLoadRecords after iocInit

This fixes lp:1829919.

src/ioc/db/dbAccess.c

@@ -730,9 +730,18 @@ int dbLoadDatabase(const char *file, const char *path, const char *subs)
 int dbLoadRecords(const char* file, const char* subs)
 {
     int status = dbReadDatabase(&pdbbase, file, 0, subs);
-
-    if (!status && dbLoadRecordsHook)
-        dbLoadRecordsHook(file, subs);
+    switch(status)
+    {
+        case 0:
+            if(dbLoadRecordsHook)
+                dbLoadRecordsHook(file, subs);
+            break;
+        case -2:
+            errlogPrintf("dbLoadRecords: failed to load %s - cannot load records after running iocBuild!\n", file);
+            break;
+        default:
+            errlogPrintf("dbLoadRecords: failed to load %s\n", file);
+    }
     return status;
 }
 

src/ioc/dbStatic/dbLexRoutines.c

@@ -16,6 +16,7 @@
 #include <stddef.h>
 #include <stdio.h>
 #include <string.h>
+#include <stdbool.h>
 
 #include "dbDefs.h"
 #include "dbmf.h"
@@ -115,6 +116,12 @@ typedef struct tempListNode {
 static ELLLIST tempList = ELLLIST_INIT;
 static void *freeListPvt = NULL;
 static int duplicate = FALSE;
+static bool dbLoadRecordsAllowed = true;
+
+void disableDbLoadRecords()
+{
+    dbLoadRecordsAllowed = false;
+}
 
 static void yyerrorAbort(char *str)
 {
@@ -215,6 +222,9 @@ static long dbReadCOM(DBBASE **ppdbbase,const char *filename, FILE *fp,
     char	*penv;
     char	**macPairs;
     
+    if(!dbLoadRecordsAllowed)
+        return -2;
+
     if(*ppdbbase == 0) *ppdbbase = dbAllocBase();
     pdbbase = *ppdbbase;
     if(path && strlen(path)>0) {

src/ioc/dbStatic/dbStaticIocRegister.c

@@ -8,12 +8,19 @@
 \*************************************************************************/
 
 #include "iocsh.h"
+#include "initHooks.h"
 
 #define epicsExportSharedSymbols
 #include "dbStaticIocRegister.h"
 #include "dbStaticLib.h"
 #include "dbStaticPvt.h"
 
+static void dbStaticIocRegisterInitHook(initHookState state)
+{
+    if(state == initHookAtIocBuild)
+        disableDbLoadRecords();
+}
+
 /* common arguments */
 
 static const iocshArg argPdbbase = { "pdbbase", iocshArgPdbbase};
@@ -153,6 +160,7 @@ static void dbReportDeviceConfigCallFunc(const iocshArgBuf *args)
 
 void dbStaticIocRegister(void)
 {
+    initHookRegister(dbStaticIocRegisterInitHook);
     iocshRegister(&dbDumpPathFuncDef, dbDumpPathCallFunc);
     iocshRegister(&dbDumpRecordFuncDef, dbDumpRecordCallFunc);
     iocshRegister(&dbDumpMenuFuncDef, dbDumpMenuCallFunc);

src/ioc/dbStatic/dbStaticPvt.h

@@ -25,6 +25,7 @@ dbDeviceMenu *dbGetDeviceMenu(DBENTRY *pdbentry);
 void dbFreeLinkContents(struct link *plink);
 void dbFreePath(DBBASE *pdbbase);
 int dbIsMacroOk(DBENTRY *pdbentry);
+void disableDbLoadRecords();
 
 /*The following routines have different versions for run-time no-run-time*/
 long dbAllocRecord(DBENTRY *pdbentry,const char *precordName);