DOS_FILE
DOS_FILE *f;
f = alloc(sizeof(DOS_FILE));
(void)memset(f, 0, sizeof(DOS_FILE));
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;
dealloc(f, sizeof(DOS_FILE));
DOS_FILE *f = (DOS_FILE *)fd->f_fsdata;