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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:

           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.

IMPLEMENTATION NOTES
     FreeBSD's support for POSIX.1e interfaces and features is still under
     development at this time.

RETURN VALUES
     Upon successful completion, the value 0 is returned; otherwise the
     value -1 is returned and the global variable errno is set to indicate the
     error.

ERRORS
     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
                        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 11.0-PRERELEASE        December 29, 2002       FreeBSD 11.0-PRERELEASE

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | IMPLEMENTATION NOTES | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS | HISTORY | AUTHORS

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