ACL_GET(3SEC) File Access Control Library Functions ACL_GET(3SEC)
NAME
acl_get, facl_get, acl_set, facl_set - get or set a file's Access
Control List (ACL)
SYNOPSIS
cc [
flag... ]
file...
-lsec [
library... ]
#include <sys/acl.h>
int acl_get(
const char *path,
int flag,
acl_t **aclp);
int facl_get(
int fd,
int flag,
acl_t **aclp);
int acl_set(
const char *path,
acl_t *aclp);
int facl_set(
int fd,
acl_t *aclp);
DESCRIPTION
The
acl_get() and
facl_get() functions retrieve an Access Control
List (ACL) of a file whose name is given by
path or referenced by the
open file descriptor
fd. The
flag argument specifies whether a
trivial ACL should be retrieved. When the
flag argument is
ACL_NO_TRIVIAL, only ACLs that are not trivial will be retrieved. The
ACL is returned in the
aclp argument.
The
acl_set() and
facl_set() functions are used for setting an ACL of
a file whose name is given by
path or referenced by the open file
descriptor
fd. The
aclp argument specifies the ACL to set.
The
acl_get() and
acl_set() functions support multiple types of ACLs.
When possible, the
acl_set() function translates an ACL to the target
file's style of ACL. Currently this is only possible when translating
from a POSIX-draft ACL such as on UFS to a file system that supports
NFSv4 ACL semantics such as ZFS or NFSv4.
RETURN VALUES
Upon successful completion,
acl_get() and
facl_get() return 0 and
aclp is non-
NULL. The
aclp argument can be
NULL after successful
completion if the file had a trivial ACL and the
flag argument was
ACL_NO_TRIVIAL. Otherwise, -1 is returned and
errno is set to
indicate the error.
Upon successful completion,
acl_set() and
facl_set() return 0.
Otherwise, -1 is returned and
errno is set to indicate the error.
ERRORS
These functions will fail if:
EACCES The caller does not have access to a component of
path.
EIO A disk I/O error has occurred while retrieving the ACL.
ENOENT A component of the
path does not exist.
ENOSYS The file system does not support ACLs.
ENOTSUP The ACL supplied could not be translated to an NFSv4 ACL.
ATTRIBUTES
See
attributes(7) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Evolving |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+
SEE ALSO
chmod(1),
acl(2),
acl(7),
attributes(7) January 30, 2023 ACL_GET(3SEC)
