An internal CLI variable, CliPPsOn, controls both the Pre-process and the Post-process SQL User Exit function.
Setting the value to FALSE turns off the Pre-process and Post-process SQL User Exit functions. That is, if set to FALSE, CLI will not call either CliPreSQLExt or CliPostSQLExt.
CliPPsOn is a global variable. To enable the CliUsrLgnExt() function, set this variable to TRUE in CliPPS.c. By default, CliPPsOn is FALSE.