osx man page for acl_get_permset_mask_np

ACL_PERMSET_MASK(3)					   BSD Library Functions Manual 				       ACL_PERMSET_MASK(3)

NAME
     acl_permset_mask -- Manipulate ACL permissions using bitmasks

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <sys/acl.h>

     int
     acl_maximal_permset_mask_np(acl_permset_mask_t * mask_p);

     int
     acl_get_permset_mask_np(acl_entry_t entry_d, acl_permset_mask_t * mask_p);

     int
     acl_set_permset_mask_np(acl_entry_t entry_d, acl_permset_mask_t mask);

DESCRIPTION
     The acl_permset_mask_t functions are a Darwin extension to the POSIX.1e ACL standard which allow manipulation of permissions in an
     acl_entry_t using a bitmask of type acl_permset_mask_t rather than a constructed acl_permset_t (as done by acl_get_permset(3) and
     acl_set_permset(3)).

     acl_permset_mask_t values may be constructed using bitwise operations over acl_perm_t values.

     acl_maximal_permset_mask_np() sets the value pointed to by mask_p to a bitmask of all valid acl_perm_t values.

     acl_get_permset_mask_np() returns via mask_p a bitmask of permissions set on the ACL entry entry_d.

     acl_set_permset_mask_np() sets the permissions of ACL entry entry_d to match the permission bitmask provided by mask.

RETURN VALUES
     The acl_maximal_permset_mask_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_get_permset_mask_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_set_permset_mask_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.

ERRORS
     The acl_get_permset_mask_np() function fails if:

     [EINVAL]		Argument entry_d is not a valid descriptor for an ACL entry.

     The acl_set_permset_mask_np() function fails if:

     [EINVAL]		Argument entry_d is not a valid descriptor for an ACL entry.

     [EINVAL]		Argument mask is not a valid bitmask of ACL permissions.

SEE ALSO
     acl(3), acl_add_perm(3), acl_clear_perms(3), acl_delete_perm(3), acl_get_permset(3), acl_set_permset(3), posix1e(3)

AUTHORS
     Jeremy Huddleston

Darwin								  August 24, 2010							    Darwin