isfd | isam file identifier |
SUCCESS, or a negative value on error, in which case the error code is found in iserrno.
this routine checks the data file itself against the data file free list in the index file for errors, and will return a value with the following bits set in accordance with it's findings:
IC_DATREAD 0 data file read error IC_BADDATA 1 data record corrupt IC_DATFREE 2 data free list is corrupt
if the return value is zero then no errors were detected.