Usage: ret = diskheap_fsync(diskheap_p);
This function calls fsync on the file descriptor associated with the
Diskheap. It is designed to make sure that all buffered data gets moved
to the disk. See the manual entry for fsync to determine what
this does in reality. This It will return DISKHEAP_ERROR_NONE if it
succeeds otherwise an error code.
Warning: even if the fsync succeeds, there is no guarantee that if the system would immediately crash that the diskheap file would not be corrupted.
Warning: on some operating systems, fsync may not be available in which case the DISKHEAP_ERROR_OS_CAPABLE error code will be returned.
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