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acl_valid, acl_valid_fd_np, acl_valid_file_np - validate an ACL



      acl_valid, acl_valid_fd_np, acl_valid_file_np - validate an ACL


      library “libposix1e”


      #include <sys/types.h>
      #include <sys/acl.h>
      acl_valid(acl_t acl);
      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);


      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() and
      acl_valid_file_np(), allow an ACL to be checked in the context of a spe‐
      cific acl type, type, and file system object.  In environments where
      additional ACL types are supported than just POSIX.1e, this makes more
      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
                         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 argu‐
                         ment 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 contin‐


      Robert N M Watson


      These features are not yet fully implemented.  In particular, the shipped
      version of UFS/FFS does not support storage of additional security
      labels, and so is unable to (easily) provide support for most of these


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