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ACL_VALID(3) FreeBSD Library Functions Manual ACL_VALID(3)
NAME
acl_valid, acl_valid_fd_np, acl_valid_file_np, acl_valid_link_np -
validate an ACL
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h>
int
acl_valid(acl_t acl);
int
acl_valid_fd_np(int fd, acl_type_t type, acl_t acl);
int
acl_valid_file_np(const char *path_p, acl_type_t type, acl_t acl);
int
acl_valid_link_np(const char *path_p, acl_type_t type, acl_t acl);
DESCRIPTION
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:
o 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 one ACL_MASK entry.
o 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.
IMPLEMENTATION NOTES
FreeBSD's support for POSIX.1e interfaces and features is still under
development at this time.
RETURN VALUES
[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
in acl.
The ACL contains entries that are not unique.
The file system rejects the ACL based on fs-specific
semantics issues.
[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.
SEE ALSO
acl(3), acl_get(3), acl_init(3), acl_set(3), posix1e(3)
STANDARDS
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
information.
HISTORY
POSIX.1e support was introduced in FreeBSD 4.0, and development
continues.
AUTHORS
Robert N M Watson
FreeBSD 14.0-RELEASE-p11 December 29, 2002 FreeBSD 14.0-RELEASE-p11