Linux Access Control Lists library (libacl, -lacl).  The function
retrieves  the access ACL associated with the file referred to by
The ACL is placed into working storage and returns a  pointer  to
that  storage.  In order to read an ACL from an object, a process
must have read access to the object’s attributes.  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.  On success, this func‐
tion shall return a pointer to the working storage.  On error,  a
value  of shall be 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 argument is not a valid
file descriptor.  The ACL working storage  requires  more  memory
than  is allowed by the hardware or system‐imposed memory manage‐
ment constraints.  The file system on which the  file  identified
by  is located does not support ACLs, or ACLs are disabled.  IEEE
Std 1003.1e draft 17 (“POSIX.1e”,  abandoned)  Derived  from  the
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