The acl_extended_file() function returns 1 if the file or directory
referred to by the argument path_p is associated with an extended
access ACL, or if the directory referred to by path_p is associated
with a default ACL. The function returns 0 if the file has neither
an extended access ACL nor a default 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_file() function for a
file object is 0, then ACLs define no discretionary access rights
other than those already defined by the traditional file permission
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.
acl_extended_file_nofollow() is identical to acl_extended_file(),
except in the case of a symbolic link, where the link itself is
interrogated, not the file that it refers to. Since symbolic links
have no ACL themselves, the operation is supposed to fail on them.
If successful, the acl_extended_file() function returns 1 if the
file object referred to by path_p has an extended access ACL or a
default ACL, and 0 if the file object referred to by path_p has
neither an extended access ACL nor a default 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_file()
function returns -1 and sets errno to the corresponding value:
[EACCES] Search permission is denied for a component of
the path prefix.
[ENAMETOOLONG] The length of the argument path_p is too long.
[ENOENT] The named object does not exist or the argument
path_p points to an empty string.
[ENOTDIR] A component of the path prefix is not a
[ENOTSUP] The file system on which the file identified by
path_p is located does not support ACLs, or ACLs
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 2023-06-23. (At that
time, the date of the most recent commit that was found in the
repository was 2022-12-30.) 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 email@example.com
Linux ACL March 23, 2002 Linux ACL