[Example]
#define BUF_SIZE  2048*2

GfsHn gfs; / * File handle * /
Sint32 nsct = 2; / * Number of read sectors * /
Sint32 stat; / * Server status * /
Uint32 buf [BUF_SIZE / 4]; / ​​* Reading area * / 

gfs = GFS_Open (fid); / * Open file * /
/ * Request function * /
GFS_NwFread (gfs, nsct, buf, BUF_SIZE); / * Read nsct sector to buf * /
                                        / * Immediate return * / 

for (;;) {
     / * Server function * /
     stat = GFS_NwExecOne (gfs); / * Execution of reading * /
     if (stat == GFS_SVR_COMPLETED) {/ * Reading complete? * /
          break;
     }
     user (); / * Arbitrary user processing * /
}

GFS_Close (gfs); / * File close * /