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acl_get, facl_get, acl_set, facl_set - get or set a file's Access Control List (ACL)

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);

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.

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.

These functions will fail if: EACCES

EIO ENOENT ENOSYS ENOTSUP

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Evolving

MT-Level MT-Safe

chmod (1), acl (2), acl (7), attributes (7)