NAME
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
n sys/types.h
n sys/acl.h
DESCRIPTION
The
function associates an access ACL with a file or directory, or
associates a default ACL with a directory. The pathname for the file or
directory is pointed to by the argument
The effective user ID of the process must match the owner of the file or
directory or the process must have the CAP_FOWNER capability for the
request to succeed.
The value of the argument
is used to indicate whether the access ACL or the default ACL associated
with
is being set. If the
parameter is ACL_TYPE_ACCESS, the access ACL of
shall be set. If the
parameter is ACL_TYPE_DEFAULT, the default ACL of
shall be set. If the argument
specifies a type of ACL that cannot be associated with
then the function fails.
The
parameter must reference a valid ACL according to the rules described on the
acl_valid(3)
manual page if the
parameter is ACL_TYPE_ACCESS, and must either reference a valid ACL or an ACL with zero ACL entries if the
parameter is ACL_TYPE_DEFAULT. If the
parameter references an empty ACL, then the
function removes any default ACL associated with the directory referred to
by the
parameter.
RETURN VALUE
ERRORS
If any of the following conditions occur, the
function returns
and sets
to the corresponding value:
- EACCES
Search permission is denied for a component of the path prefix or the
object exists and the process does not have appropriate access rights.
Argument
specifies a type of ACL that cannot be associated with
EINVAL
The argument
does not point to a valid ACL.
The ACL has more entries than the file referred to by
can obtain.
The
parameter is not ACL_TYPE_ACCESS or ACL_TYPE_DEFAULT.
The
parameter is ACL_TYPE_DEFAULT, but the file referred to by
is not a directory.
ENAMETOOLONG
The length of the argument
is too long.
ENOENT
The named object does not exist or the argument
points to an empty string.
ENOSPC
The directory or file system that would contain the new ACL cannot be extended or the file system is out of file allocation resources.
ENOTDIR
A component of the path prefix is not a directory.
ENOTSUP
The file identified by
cannot be associated with the ACL because the file system on which the file
is located does not support this.
EPERM
The process does not have appropriate privilege to perform the operation to set the ACL.
EROFS
This function requires modification of a file system which is currently read-only.
STANDARDS
IEEE Std 1003.1e draft 17 (POSIX.1e, abandoned)
The behavior of
when the
parameter refers to an empty ACL and the
parameter is ACL_TYPE_DEFAULT is an extension in the Linux implementation, in order that all values returned by
can be passed to
The POSIX.1e function for removing a default ACL is
SEE ALSO
AUTHOR
Derived from the FreeBSD manual pages written by
and adapted for Linux by
