Linux Access Control Lists library (libacl, -lacl).  The function
creates  a new ACL entry in the ACL pointed to by the contents of
the pointer argument On success, the function returns a  descrip‐
tor  for  the new ACL entry via This function may cause memory to
be allocated.  The caller should free any releasable memory, when
the new ACL is no longer required, by calling with  as  an  argu‐
ment.  If the ACL working storage cannot be increased in the cur‐
rent location, then the working storage for the ACL pointed to by
may  be relocated and the previous working storage is released. A
pointer to the new working storage is returned via The components
of the new ACL entry are initialized in the following  ways:  the
ACL  tag type component contains ACL_UNDEFINED_TAG, the qualifier
component contains ACL_UNDEFINED_ID, and the set  of  permissions
has  no  permissions  enabled. Any existing ACL entry descriptors
that refer to entries in the ACL continue to refer to  those  en‐
tries.   If  any  of the following conditions occur, the function
returns and sets to the corresponding value: The argument is  not
a valid pointer to an 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 the FreeBSD manual pages written by and
adapted for Linux by