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 mecha‐
nisms, 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.
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. Other‐
wise, the value -1 is returned and the global variable errno is set to
indicate the error.
If any of the following conditions occur, the acl_extended_fd() func‐
tion 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 dis‐
This page is part of the acl (manipulating access control lists)
project. Information about the project can be found at
http://savannah.nongnu.org/projects/acl. If you have a bug report for
this manual page, see http://savannah.nongnu.org/bugs/?group=acl. This
page was obtained from the project's upstream Git repository
git://git.savannah.nongnu.org/acl.git on 2017-03-13. If you discover
any rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON (which
is not part of the original manual page), send a mail to
Linux ACL March 23, 2002 Linux ACL