acl_valid, acl_valid_fd_np, acl_valid_file_np, acl_valid_link_np -- validate
Standard C Library (libc, -lc)
acl_valid_fd_np(int fd, acl_type_t type, acl_t acl);
acl_valid_file_np(const char *path_p, acl_type_t type, acl_t acl);
acl_valid_link_np(const char *path_p, acl_type_t type, acl_t acl);
These functions check that the ACL referred to by the argument acl is
valid. The POSIX.1e routine, acl_valid(), checks this validity only with
POSIX.1e ACL semantics, and irrespective of the context in which the ACL
is to be used. The non-portable forms, acl_valid_fd_np(),
acl_valid_file_np(), and acl_valid_link_np() allow an ACL to be checked
in the context of a specific acl type, type, and file system object. In
environments where additional ACL types are supported than just POSIX.1e,
this makes more sense. Whereas acl_valid_file_np() will follow the symlink
if the specified path is to a symlink, acl_valid_link_np() will not.
For POSIX.1e semantics, the checks include:
The three required entries (ACL_USER_OBJ, ACL_GROUP_OBJ,
and ACL_OTHER) shall exist exactly once in the ACL. If
the ACL contains any ACL_USER, ACL_GROUP, or any other
implementation-defined entries in the file group class
then one ACL_MASK entry shall also be required. The ACL
shall contain at most on ACL_MASK entry.
The qualifier field shall be unique among all entries of
the same POSIX.1e ACL facility defined tag type. The
tag type field shall contain valid values including any
implementation-defined values. Validation of the values
of the qualifier field is implementation-defined.
The POSIX.1e acl_valid() function may reorder the ACL for the purposes of
verification; the non-portable validation functions will not.
FreeBSD's support for POSIX.1e interfaces and features is still under
development at this time.
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable errno is set to indicate the
If any of the following conditions occur, these functions shall return -1
and set errno to the corresponding value:
[EACCES] Search permission is denied for a component of the
path prefix, or the object exists and the process does
not have appropriate access rights.
[EBADF] The fd argument is not a valid file descriptor.
[EINVAL] Argument acl does not point to a valid ACL.
One or more of the required ACL entries is not present
The ACL contains entries that are not unique.
The file system rejects the ACL based on fs-specific
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or
an entire path name exceeded 1023 characters.
[ENOENT] The named object does not exist, or the path_p argument
points to an empty string.
[ENOMEM] Insufficient memory available to fulfill request.
[EOPNOTSUPP] The file system does not support ACL retrieval.
acl(3), acl_get(3), acl_init(3), acl_set(3), posix1e(3)
POSIX.1e is described in IEEE POSIX.1e draft 17. Discussion of the draft
continues on the cross-platform POSIX.1e implementation mailing list. To
join this list, see the FreeBSD POSIX.1e implementation page for more
POSIX.1e support was introduced in FreeBSD 4.0, and development continues.
Robert N M Watson
FreeBSD 5.2.1 December 29, 2002 FreeBSD 5.2.1 [ Back ]