#include <systypes/base.h>  /* offset_t */  /* An interface providing operations specific to mapped files. */  interface MappedFile {   /* Memory-map a file for the given file position and length, masking regions      beyond any visible range if indicated, obtaining the limits of the mapped      region and the size of the file. */    [opcode(7)] void mmap(in offset_t position, in offset_t length,                         in offset_t start_visible, in offset_t end_visible,                         out offset_t start_pos, out offset_t end_pos,                         out offset_t size); };