|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | SEE ALSO | AUTHOR | COLOPHON |
|
|
|
ACL_EXTENDED_FD(3) Library Functions Manual ACL_EXTENDED_FD(3)
acl_extended_fd — test for information in the ACL by file
descriptor
Linux Access Control Lists library (libacl, -lacl).
<sys/types.h> <acl/libacl.h> int acl_extended_fd(int fd)
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.
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.
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.
This is a non-portable, Linux specific extension to the ACL
manipulation functions defined in IEEE Std 1003.1e draft 17
(“POSIX.1e”, abandoned).
access(2), acl_get_fd(3), acl(5)
Written by Andreas Gruenbacher <andreas.gruenbacher@gmail.com>.
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 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-05-12.) 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)
|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|