ACL_GET(3) BSD Library Functions Manual ACL_GET(3)NAME
acl_get_fd, acl_get_fd_np, acl_get_file, acl_get_link_np — get an ACL for
Standard C Library (libc, -lc)
acl_get_fd_np(int fd, acl_type_t type);
acl_get_file(const char *path_p, acl_type_t type);
acl_get_link_np(const char *path_p, acl_type_t type);
The acl_get_fd(), acl_get_file(), acl_get_link_np(), and acl_get_fd_np()
each allow the retrieval of an ACL from a file. The acl_get_fd() is a
POSIX.1e call that allows the retrieval of an ACL of type ACL_TYPE_ACCESS
from a file descriptor. The acl_get_fd_np() function is a non-portable
form of acl_get_fd() that allows the retrieval of any type of ACL from a
file descriptor. The acl_get_file() function is a POSIX.1e call that
allows the retrieval of a specified type of ACL from a file by name;
acl_get_link_np() is a non-portable variation on acl_get_file() which
does not follow a symlink if the target of the call is a symlink.
These functions may cause memory to be allocated. The caller should free
any releasable memory, when the new ACL is no longer required, by calling
acl_free(3) with the (void *)acl_t as an argument.
The ACL in the working storage is an independent copy of the ACL associ‐
ated with the object referred to by fd. The ACL in the working storage
shall not participate in any access control decisions.
Valid values for the type argument are:
ACL_TYPE_ACCESS POSIX.1e access ACL
ACL_TYPE_DEFAULT POSIX.1e default ACL
ACL_TYPE_NFS4 NFSv4 ACL
The ACL returned will be branded accordingly.
FreeBSD's support for POSIX.1e interfaces and features is still under
development at this time.
Upon successful completion, the function shall return a pointer to the
ACL that was retrieved. Otherwise, a value of (acl_t)NULL shall be
returned, and errno shall be set to indicate the error.
If any of the following conditions occur, the acl_get_fd() function shall
return a value of (acl_t)NULL and set errno 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.
[EBADF] The fd argument is not a valid file descriptor.
[EINVAL] The ACL type passed is invalid for this file object.
[ENAMETOOLONG] A component of a pathname exceeded 255 characters, or
an entire path name exceeded 1023 characters.
[ENOENT] The named object does not exist, or the path_p argu‐
ment points to an empty string.
[ENOMEM] Insufficient memory available to fulfill request.
[EOPNOTSUPP] The file system does not support ACL retrieval.
SEE ALSOacl(3), acl_free(3), acl_get(3), acl_get_brand_np(3), acl_set(3),
POSIX.1e is described in IEEE POSIX.1e draft 17. Discussion of the draft
continues on the cross-platform POSIX.1e implementation mailing list. To
join this list, see the FreeBSD POSIX.1e implementation page for more
POSIX.1e support was introduced in FreeBSD 4.0, and development contin‐
Robert N M Watson
BSD June 25, 2009 BSD