Disable error messages by default in order to prevent filling the log. Set variable streamDebug to 1 to enable error messages.

src/StreamEpics.cc

@@ -180,6 +180,7 @@ public:
 #ifndef EPICS_3_13
 extern "C" {
 epicsExportAddress(int, streamDebug);
+epicsExportAddress(int, streamError);
 }
 #endif
 

src/StreamError.cc

@@ -23,6 +23,7 @@
 #include <stdio.h>
 
 int streamDebug = 0;
+int streamError = 0;
 extern "C" {
 #ifdef _WIN32
 __declspec(dllexport)
@@ -74,6 +75,7 @@ void StreamError(int line, const char* file, const char* fmt, ...)
 void StreamVError(int line, const char* file, const char* fmt, va_list args)
 {
     char timestamp[40];
+    if (!streamError) return; // Error logging disabled
     StreamPrintTimestampFunction(timestamp, 40);
 #ifdef va_copy
     if (StreamDebugFile)

src/StreamError.h

@@ -28,6 +28,7 @@
 #endif
 
 extern int streamDebug;
+extern int streamError;
 extern void (*StreamPrintTimestampFunction)(char* buffer, int size);
 
 void StreamError(int line, const char* file, const char* fmt, ...)

src/makedbd.pl

@@ -2,6 +2,7 @@ if (@ARGV[0] == "-3.13") {
     shift;
 } else {
     print "variable(streamDebug, int)\n";
+    print "variable(streamError, int)\n";
     print "registrar(streamRegistrar)\n";
 }
 print "driver(stream)\n";