acl_extended_fd(3) — Linux manual page
ACL_EXTENDED_FD(3) Library Functions Manual ACL_EXTENDED_FD(3)
NAME
acl_extended_fd — test for information in the ACL by file
descriptor
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
<sys/types.h> <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>.
COLOPHON
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 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-04-25.) If you discover any rendering
problems in this HTML version of the page, or you believe there
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(which is not part of the original manual page), send a mail to
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