acl_extended_fd(3) — Linux manual page

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | SEE ALSO | AUTHOR | COLOPHON

ACL_EXTENDED_FD(3)       Library Functions Manual     ACL_EXTENDED_FD(3)

NAME         top

       acl_extended_fd — test for information in the ACL by file
       descriptor

LIBRARY         top

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

SYNOPSIS         top

       <sys/types.h> <acl/libacl.h> int acl_extended_fd(int fd)

DESCRIPTION         top

       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         top

       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         top

       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         top

       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         top

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

AUTHOR         top

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

COLOPHON         top

       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 2023-12-22.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2023-12-01.)  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
       man-pages@man7.org

Linux ACL                    March 23, 2002           ACL_EXTENDED_FD(3)