acl_copy_entry —
copy an ACL entry to another ACL entry
Standard C Library (libc, -lc)
#include <sys/types.h>
#include <sys/acl.h>
int
  
  acl_copy_entry(acl_entry_t
    dest_d, acl_entry_t
    src_d);
The acl_copy_entry() function is a POSIX.1e call that
  copies the contents of ACL entry src_d to ACL entry
  dest_d.
The acl_copy_entry() function returns the value 0
  if successful; otherwise the value -1 is returned and the global
  variable errno is set to indicate the error.
The acl_copy_entry() function fails if:
  - [EINVAL]
- Argument src_d or dest_d is
      not a valid descriptor for an ACL entry, or arguments
      src_d and dest_d reference the
      same ACL entry.
POSIX.1e is described in IEEE POSIX.1e draft 17.
POSIX.1e support was introduced in FreeBSD 4.0. Theacl_copy_entry() function was added in
  FreeBSD 5.0.
The acl_copy_entry() function was written by
  Chris D. Faulhaber
  <jedgar@fxp.org>.