NAME
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
n sys/types.h
n sys/acl.h
DESCRIPTION
The
function retrieves the qualifier from the ACL entry indicated by the argument
into working storage and returns a pointer to that storage.
If the value of the tag type in the ACL entry referred to by
is ACL_USER, then the value returned by
is a pointer to type
If the value of the tag type in the ACL entry referred to by
is ACL_GROUP, then the value returned by
is a pointer to type
If the tag type in the ACL entry referred to by
is a tag type for which a qualifier is not supported,
returns a value of
and the function fails. Subsequent operations using the returned pointer
operate on an independent copy of the qualifier in working storage, and will not change the qualifier of the ACL entry.
This function may cause memory to be allocated. The caller should free any
releasable memory, when the new qualifier is no longer required, by calling
with the
value returned by
as an argument.
The argument
and any other ACL entry descriptors that refer to entries within the ACL
containing the entry referred to by
continue to refer to those entries. The order of all existing
entries in the ACL containing the entry referred to by
remains unchanged.
RETURN VALUE
On success, the function returns a pointer to the tag qualifier that was retrieved into ACL working storage. On error, a value of
is returned and
is set appropriately.
ERRORS
If any of the following conditions occur, the
function returns
and sets
to the corresponding value:
- EINVAL
The argument
is not a valid descriptor for an ACL entry.
The value of the tag type in the ACL entry referenced by the argument
is neither ACL_USER nor ACL_GROUP.
ENOMEM
The value to be returned requires more memory than is allowed by the hardware or system-imposed memory management constraints.
STANDARDS
IEEE Std 1003.1e draft 17 (POSIX.1e, abandoned)
SEE ALSO
AUTHOR
Derived from the FreeBSD manual pages written by
and adapted for Linux by
