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v811_spc009/external/tpm2-tss/doc/logging.md

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Compile time log levels

At compile time the maximum log level can be specified. This allows distros to disable the overhead code and reduce overall code size.

Runtime log level

At runtime, the log level is determined by an environment variable. The default log level is WARNING. The level can be changed by setting the TSS2_LOG environment variable.

Possible levels are: NONE, ERROR, WARNING, INFO, DEBUG, TRACE

The level can be set for all module using the all module name or individually per module. The environment variable is evaluated left to right.

Example: TSS2_LOG=all+ERROR,marshal+TRACE,tcti+DEBUG

Implementation

Each source code file specifies its corresponding module before including log.h.

#define LOGMODULE tcti
#include "log.h"

Optionally, the default log-level for this module can be set:

#define LOGMODULE tcti
#define LOGDEFAULT ERROR
#include "log.h"