>> acl_calc_mask (3) ( Linux man: Библиотечные вызовы )
BSD mandoc
Linux ACL
NAME
acl_calc_mask
- calculate the file group class mask
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h> int
acl_calc_mask (acl_t *acl_p);
DESCRIPTION
The
acl_calc_mask ();
function calculates and sets the permissions associated with the ACL_MASK
ACL entry of the ACL referred to by
acl_p
The value of the new permissions is the union of the permissions
granted by all entries of tag type ACL_GROUP, ACL_GROUP_OBJ, or ACL_USER.
If the ACL referred to by
acl_p
already contains an ACL_MASK entry, its permissions are overwritten;
if it does not contain an ACL_MASK entry, one is added.
If the ACL referred to by
acl_p
does not contain enough space for the new ACL entry, then additional working
storage may be allocated. If the working storage cannot be increased in the
current location, then it may be relocated and the previous working storage
is released and a pointer to the new working storage is returned via
acl_p
The order of existing entries in the ACL is undefined after this function.
Any existing ACL entry descriptors that refer to entries in the ACL continue to
refer to those entries. Any existing ACL pointers that refer to the ACL
referred to by
acl_p
continue to refer to the ACL.
RETURN VALUE
Rv -std acl_calc_mask
ERRORS
If any of the following conditions occur, the
acl_calc_mask ();
function returns
-1
and sets
errno
to the corresponding value:
Bq Er EINVAL
The argument
acl
is not a valid pointer to an ACL.
Bq Er ENOMEM
The
acl_calc_mask ();
function is unable to allocate the memory required for an ACL_MASK ACL entry.
