WslcStdIOCallback

typedef __callback void(CALLBACK* WslcStdIOCallback)(
    WslcProcessIOHandle ioHandle, _In_reads_bytes_(dataBytes) const BYTE* data, _In_ uint32_t dataBytes, _In_opt_ PVOID context);

Header notes:

• Only STDOUT and STDERR receive callbacks.
• data is owned by WSLC and is only valid during the callback.
• The buffer is not null-terminated.
• The callback should return promptly.