Linux Access Control Lists library (libacl, -lacl).  The function
copies  an  exportable,  contiguous,  persistent  form of an ACL,
pointed to by to the internal representation.  This function  may
cause  memory  to  be  allocated.  The caller should free any re‐
leasable memory, when the new ACL is no longer required, by call‐
ing with the returned by as an argument.  Upon success, the func‐
tion returns a pointer that references the ACL in  working  stor‐
age.  On error, a value of is returned, and is set appropriately.
If  any of the following conditions occur, the function returns a
value of and sets to the corresponding value: The buffer  pointed
to  by  the  argument does not contain a valid external form ACL.
The ACL working storage requires more memory than is  allowed  by
the  hardware  or  system‐imposed  memory management constraints.
IEEE Std 1003.1e draft 17 (“POSIX.1e”,  abandoned)  Derived  from
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