ACL_GET_ENTRY
Section: C Library Functions (3)
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BSD mandoc
Linux ACL
NAME
acl_get_entry
- get an ACL entry
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
In sys/types.h
In sys/acl.h
Ft int
Fn acl_get_entry acl_t acl int entry_id acl_entry_t *entry_p
DESCRIPTION
The
Fn 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
Fn acl_get_entry
with
entry_id
set to ACL_NEXT_ENTRY when there has not been either an initial
successful call to
Fn acl_get_entry ,
or a previous successful call to
Fn acl_get_entry
following a call to
Fn acl_calc_mask ,
Fn acl_copy_int ,
Fn acl_create_entry ,
Fn acl_delete_entry ,
Fn acl_dup ,
Fn acl_from_text ,
Fn acl_get_fd ,
Fn acl_get_file ,
Fn acl_set_fd ,
Fn acl_set_file ,
or
Fn acl_valid ,
then the effect is unspecified.
Calls to
Fn 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
Fn 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
Fn 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.
STANDARDS
IEEE Std 1003.1e draft 17 (lqPOSIX.1erq, abandoned)
SEE ALSO
acl_calc_mask3,
acl_create_entry3,
acl_copy_entry3,
acl_delete_entry3,
acl_get_file3,
acl(5)
AUTHOR
Derived from the FreeBSD manual pages written by
An Robert N M Watson Aq
rwatson@FreeBSD.org ,
and adapted for Linux by
An Andreas Gruenbacher Aq
a.gruenbacher@bestbits.at .
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- STANDARDS
-
- SEE ALSO
-
- AUTHOR
-
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