acl_get_flag_np —
check if a flag is set in a flagset
Standard C Library (libc, -lc)
#include <sys/types.h>
#include <sys/acl.h>
int
  
  acl_get_flag_np(acl_flagset_t
    flagset_d, acl_flag_t
    flag);
The acl_get_flag_np() function is a non-portable
  function that checks if a NFSv4 ACL flag is set in a flagset.
If the flag in flag is set in the flagset
  flagset_d, a value of 1 is returned, otherwise a value
  of 0 is returned.
If any of the following conditions occur, the
  acl_get_flag_np() function will return a value of -1
  and set global variable errno to the corresponding
  value:
  - [EINVAL]
- Argument flag does not contain a valid ACL flag or
      argument flagset_d is not a valid ACL flagset.
POSIX.1e is described in IEEE POSIX.1e draft 17.
POSIX.1e support was introduced in FreeBSD 4.0. Theacl_get_flag_np() function was added in
  FreeBSD 8.0.
The acl_get_flag_np() function was written by
  Edward Tomasz Napierala
  <trasz@FreeBSD.org>.