|ACL_GET_QUALIFIER(3)||Library Functions Manual||ACL_GET_QUALIFIER(3)|
retrieve the qualifier from an ACL entry
Linux Access Control Lists library (libacl, -lacl).
function retrieves the qualifier from the ACL entry indicated by the
argument entry_d into working storage and returns a
pointer to that storage.
If the value of the tag type in the ACL
entry referred to by entry_d is ACL_USER, then the
value returned by
is a pointer to type uid_t. If the value of the tag
type in the ACL entry referred to by entry_d is
ACL_GROUP, then the value returned by
acl_get_qualifier() is a pointer to type
gid_t. If the tag type in the ACL entry referred to by
entry_d is a tag type for which a qualifier is not
acl_get_qualifier() returns a value of
(void *)NULL 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
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 void * value returned by
acl_get_qualifier() as an argument.
The argument entry_d and any other ACL entry descriptors that refer to entries within the ACL containing the entry referred to by entry_d continue to refer to those entries. The order of all existing entries in the ACL containing the entry referred to by entry_d remains unchanged.
On success, the function returns a pointer to the tag qualifier
that was retrieved into ACL working storage. On error, a value of
(void *)NULL is returned and
errno is set appropriately.
If any of the following conditions occur, the
acl_get_qualifier() function returns
(void *)NULL and sets errno to
the corresponding value:
- The argument entry_d is not a valid descriptor for
an ACL entry.
The value of the tag type in the ACL entry referenced by the argument entry_d is neither ACL_USER nor ACL_GROUP.
- The value to be returned requires more memory than is allowed by the hardware or system-imposed memory management constraints.
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)
Derived from the FreeBSD manual pages written by Robert N M Watson ⟨rwatson@FreeBSD.org⟩, and adapted for Linux by Andreas Gruenbacher ⟨email@example.com⟩.
|March 23, 2002||Linux ACL|