acl_delete_perm —
delete permissions from a permission set
Standard C Library (libc, -lc)
#include <sys/types.h>
#include <sys/acl.h>
int
  
  acl_delete_perm(acl_permset_t
    permset_d, acl_perm_t
    perm);
The acl_delete_perm() function is a POSIX.1e call that
  removes specific permissions from permissions set perm.
The acl_delete_perm() 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_delete_perm() function fails if:
  - [EINVAL]
- Argument permset_d is not a valid descriptor for a
      permission set. Argument perm does not contain a
      valid acl_perm_t value.
POSIX.1e is described in IEEE POSIX.1e draft 17.
POSIX.1e support was introduced in FreeBSD 4.0. Theacl_delete_perm() function was added in
  FreeBSD 5.0.
The acl_delete_perm() function was written by
  Chris D. Faulhaber
  <jedgar@fxp.org>.