вычислить маску класса группы файлов (calculate the file group class mask)
Имя (Name)
acl_calc_mask — calculate the file group class mask
Библиотека (Library)
Linux Access Control Lists library (libacl, -lacl).
Синопсис (Synopsis)
#include <sys/types.h>
#include <sys/acl.h>
int
acl_calc_mask(acl_t *acl_p);
Описание (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.
Возвращаемое значение (Return value)
The acl_calc_mask() function returns the value 0 if successful;
otherwise the value -1 is returned and the global variable errno is
set to indicate the error.
Ошибки (Error)
If any of the following conditions occur, the acl_calc_mask()
function returns -1 and sets errno to the corresponding value:
[EINVAL] The argument acl is not a valid pointer to an
ACL.
[ENOMEM] The acl_calc_mask() function is unable to
allocate the memory required for an ACL_MASK ACL
entry.
Стандарты (Conforming to)
IEEE Std 1003.1e draft 17 ('POSIX.1e', abandoned)
Смотри также (See also)
acl_check(3), acl_get_entry(3), acl_valid(3), acl(5)
