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)