>> acl_get_entry (3) ( Linux man: Библиотечные вызовы )
BSD mandoc
Linux ACL
NAME
acl_get_entry
- get an ACL entry
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h> int
acl_get_entry (acl_t acl int entry_id acl_entry_t *entry_p);
DESCRIPTION
The
acl_get_entry ();
function obtains a descriptor for an ACL entry as specified by
entry_id
within the ACL indicated by the argument
acl
If the value of
entry_id
is ACL_FIRST_ENTRY, then the function returns in
entry_p
a descriptor for the first ACL entry within
acl
If the value of
entry_id
is ACL_NEXT_ENTRY, then the function returns in
entry_p
a descriptor for the next ACL entry within
acl
If a call is made to
acl_get_entry ();
with
entry_id
set to ACL_NEXT_ENTRY when there has not been either an initial
successful call to
acl_get_entry (,);
or a previous successful call to
acl_get_entry ();
following a call to
acl_calc_mask (,);
acl_copy_int (,);
acl_create_entry (,);
acl_delete_entry (,);
acl_dup (,);
acl_from_text (,);
acl_get_fd (,);
acl_get_file (,);
acl_set_fd (,);
acl_set_file (,);
or
acl_valid (,);
then the effect is unspecified.
Calls to
acl_get_entry ();
do not modify any ACL entries. Subsequent operations using the returned
ACL entry descriptor operate on the ACL entry within the ACL in working
storage. The order of all existing entries in the ACL remains unchanged.
Any existing ACL entry descriptors that refer to entries within the ACL
continue to refer to those entries. Any existing ACL pointers that refer
to the ACL referred to by
acl
continue to refer to the ACL.
RETURN VALUE
If the function successfully obtains an ACL entry, the function returns a
value of
1
If the ACL has no ACL entries, the function returns the value
0
If the value of
entry_id
is ACL_NEXT_ENTRY and the last ACL entry in the ACL has already been
returned by a previous call to
acl_get_entry (,);
the function returns the value
0
until a successful call with an
entry_id
of ACL_FIRST_ENTRY is made. Otherwise, the value
-1
is returned and
errno
is set to indicate the error.
ERRORS
If any of the following conditions occur, the
acl_get_entry ();
function returns
-1
and sets
errno
to the corresponding value:
Bq Er EINVAL
The argument
acl_p
is not a valid pointer to an ACL.
The argument
entry_id
is neither ACL_NEXT_ENTRY nor ACL_FIRST_ENTRY.
