DESCRIPTION
The !-- .Fn acl_get_qualifier acl_get_qualifier function is a POSIX.1e call that retrieves the qualifier of the tag for the ACL entry indicated by the argument !-- .Fa entry_d 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 !-- .Fa entry_d entry_d is !-- .Dv ACL_USER , ACL_USER, then the value returned by !-- .Fn acl_get_qualifier acl_get_qualifier will be a pointer to type !-- .Vt uid_t .
.Vt uid_t .
If the value of the tag type in the ACL entry referred to by !-- .Fa entry_d entry_d is !-- .Dv ACL_GROUP , ACL_GROUP, then the value returned by !-- .Fn acl_get_qualifier acl_get_qualifier will be a pointer to type !-- .Vt gid_t .
.Vt gid_t .
If the value of the tag type in the ACL entry referred to by !-- .Fa entry_d entry_d is !-- .Dv ACL_UNDEFINED_TAG , ACL_USER_OBJ , ACL_GROUP_OBJ , ACL_UNDEFINED_TAG, ACL_USER_OBJ, ACL_GROUP_OBJ, !-- .Dv ACL_OTHER , ACL_MASK , ACL_OTHER, ACL_MASK, or an implementation-defined value for which a qualifier is not supported, then !-- .Fn acl_get_qualifier acl_get_qualifier will return a value of !-- .Vt ( void * ) Ns Dv NULL
.Vt ( void * ) Ns Dv NULL and the function will fail.
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 !-- .Fn acl_free acl_free with !-- .Vt void *
.Vt void * as the argument. !-- .Sh RETURN VALUES
RETURN VALUES
The !-- .Fn acl_get_qualifier acl_get_qualifier function returns a pointer to the allocated storage if successful; otherwise a !-- .Dv NULL NULL pointer is returned and the global variable !-- .Va errno errno is set to indicate the error. !-- .Sh ERRORS
ERRORS
The !-- .Fn acl_get_qualifier acl_get_qualifier fails if: !-- .Bl -tag -width Er !-- .It Bq Er EINVAL
