Linux Access Control Lists library (libacl, -lacl).  The function
assigns to the value pointed to by the tag type for the ACL entry
indicated  by  the  argument The argument and any other ACL entry
descriptors that refer to entries in the same ACL continue to re‐
fer to those entries. The order of all existing  entries  in  the
ACL  remain unchanged.  If any of the following conditions occur,
the function returns and sets to the corresponding value: The ar‐
gument is not a valid descriptor for  an  ACL  entry.   IEEE  Std
1003.1e draft 17 (“POSIX.1e”, abandoned) Derived from the FreeBSD
manual pages written by and adapted for Linux by