acl_delete_flag_np —
delete flags from a flagset
Standard C Library (libc, -lc)
#include <sys/types.h>
#include <sys/acl.h>
int
  
  acl_delete_flag_np(acl_flagset_t
    flagset_d, acl_flag_t
    flag);
The acl_delete_flag_np() function is a non-portable call
  that removes specific NFSv4 ACL flags from flagset
  flags.
The acl_delete_flag_np() 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_flag_np() function fails if:
  - [EINVAL]
- Argument flagset_d is not a valid descriptor for a
      flagset. Argument flag does not contain a valid
      acl_flag_t value.
POSIX.1e is described in IEEE POSIX.1e draft 17.
POSIX.1e support was introduced in FreeBSD 4.0. Theacl_delete_flag_np() function was added in
  FreeBSD 8.0.
The acl_delete_flag_np() function was written by
  Edward Tomasz Napierala
  <trasz@FreeBSD.org>.