Linux Access Control Lists library (libacl, -lacl).  The function
associates  an access ACL with the file referred to by The effec‐
tive user ID of the process must match the owner of the  file  or
the  process  must have the CAP_FOWNER capability for the request
to succeed.  If any of the following conditions occur, the  func‐
tion  returns  the value and and sets to the corresponding value:
The argument is not a valid file descriptor.  The  argument  does
not point to a valid ACL.  The ACL has more entries than the file
referred  to  by  can  obtain.  The directory or file system that
would contain the new ACL cannot be extended or the  file  system
is out of file allocation resources.  The file identified by can‐
not  be  associated with the ACL because the file system on which
the file is located does not support this.  The process does  not
have  appropriate  privilege  to perform the operation to set the
ACL.  This function requires modification of a file system  which
is  currently  read‐only.  IEEE Std 1003.1e draft 17 (“POSIX.1e”,
abandoned) Derived from the FreeBSD manual pages written  by  and
adapted for Linux by