/** Simulates a local read action. Returns the size of data actually read */
sg_size_t read(sg_size_t size);
/** Simulates a write action. Returns the size of data actually written. */
sg_size_t write(sg_size_t size);
/** Simulates a local read action. Returns the size of data actually read */
sg_size_t read(sg_size_t size);
/** Simulates a write action. Returns the size of data actually written. */
sg_size_t write(sg_size_t size);