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FM SDK Programming Guide > FMDEBUG Reference
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FMDEBUG provides debug functions to FM writers. Debug information is available via the hsmtrace utility on the host.
On Linux, these debug messages are also written to /var/log/messages
Historically, debug logging has been via a simulated serial port 0. This is maintained for backwards compatibility. In SafeNet ProtectToolkit 5 support was added for standard C printf to write to the hsmtrace log. This is the recommended method.
Note: These functions and macros are supported under the FM emulation build as well. In this case the printing is done to stdout instead of the serial port.