NAME

       acl_extended_fd — test for information in the ACL by file descriptor

LIBRARY

       Linux Access Control Lists library (libacl, -lacl).

SYNOPSIS

       #include <sys/types.h>
       #include <acl/libacl.h>

       int
       acl_extended_fd(int fd);

DESCRIPTION

       The  acl_extended_fd() function returns 1 if the file identified by the argument fd is associated with an
       extended access ACL. The function returns 0 if the file does not have an extended access ACL.

       An extended ACL is an ACL that contains entries other than  the  three  required  entries  of  tag  types
       ACL_USER_OBJ,  ACL_GROUP_OBJ  and  ACL_OTHER.  If the result of the acl_extended_fd() function for a file
       object is 0, then the ACL defines no discretionary access rights other than those already defined by  the
       traditional file permission bits.

       Access to the file object may be further restricted by other mechanisms, such as Mandatory Access Control
       schemes.  The  access(2) system call can be used to check whether a given type of access to a file object
       would be granted.

RETURN VALUE

       If successful, the acl_extended_fd() function returns 1 if the  file  object  identified  by  fd  has  an
       extended  access  ACL,  and  0  if the file object identified by fd does not have an extended access ACL.
       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, the acl_extended_fd() function returns -1 and sets errno to the
       corresponding value:

       [EBADF]            The fd argument is not a valid file descriptor.

       [ENOTSUP]          The file system on which the file identified by fd is located does not  support  ACLs,
                          or ACLs are disabled.

STANDARDS

       This  is  a  non-portable, Linux specific extension to the ACL manipulation functions defined in IEEE Std
       1003.1e draft 17 (“POSIX.1e”, abandoned).

SEE ALSO

       access(2), acl_get_fd(3), acl(5)

AUTHOR

       Written by Andreas Gruenbacher <andreas.gruenbacher@gmail.com>.

Linux ACL                                        March 23, 2002                               ACL_EXTENDED_FD(3)