getdirentries - get directory entries in a filesystem-independent format
Read directory entries from the directory specified by
buf. At most
nbytes are read. Reading starts at offset
*basep is updated with the new position after reading.
getdirentries() returns the number of bytes read or zero when at the end of the directory. If an error occurs, -1 is returned, and
errno is set appropriately.
See the Linux library source code for details.
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