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:
- [
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 (“POSIX.1e”, abandoned)
SEE ALSO¶
acl_calc_mask(3),
acl_create_entry(3),
acl_copy_entry(3),
acl_delete_entry(3),
acl_get_file(3),
acl(5)
AUTHOR¶
Derived from the FreeBSD manual pages written by
Robert N M Watson
⟨rwatson@FreeBSD.org⟩, and adapted for Linux by
Andreas Gruenbacher
⟨a.gruenbacher@bestbits.at⟩.