Function Codes
Function codes are numbers assigned to each system call and used to identify the system call.
The actual values for function codes of system calls are implementation-defined, but unique negative values shall be assigned to each system call. The reason why function codes are implementation-defined is that system call interfaces are implementation-defined in µT-Kernel and implementations called in a form that does not use function codes may also exist.
Positive values are assigned to the function codes of extended SVCs. For details, refer to tk_def_ssy.
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