6. Creating an Application with OpenAPI : How You Can Create an OpenAPI Application : Environment Variables : II_API_SET
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The II_API_SET environment variable allows GCA_TRACE messages to be written to a file.
Set II_API_SET to PRINTTRACE to write GCA_TRACE messages to default output file iiprttrc.c. To direct output to a different file, add the TRACEFILE option followed by the file name.
For example, on UNIX, to enable OpenAPI tracing of GCA_TRACE messages to output file tracing.log:
setenv II_API_SET "printtrace; tracefile tracing.log"