Declare invariant structure const.

src/pio_interface.c

@@ -43,7 +43,11 @@ static struct rdmaWin
 } *txWin = NULL;
 
 
-char * funcMap[numRPCFuncs] = {"streamOpen", "streamDefVlist", "streamClose" };
+const char * const funcMap[numRPCFuncs] = {
+  "streamOpen",
+  "streamDefVlist",
+  "streamClose"
+};
 
 float cdiPIOpartInflate_;
 

src/pio_rpc.h

@@ -37,7 +37,7 @@ enum
   PARTDESCMARKER = -numRPCFuncs - 2,
 };
 enum { MAXDATAFILENAME = 256, MINFUNCID = STREAMCLOSE, MAXFUNCID = STREAMOPEN };
-extern char * funcMap[numRPCFuncs];
+extern const char * const funcMap[numRPCFuncs];
 
 struct headerSize
 {