ACL_SET(3) BSD Library Functions Manual ACL_SET(3)NAME
acl_set_fd, acl_set_fd_np, acl_set_file, acl_set_link_np — set an ACL for
Standard C Library (libc, -lc)
acl_set_fd(int fd, acl_t acl);
acl_set_fd_np(int fd, acl_t acl, acl_type_t type);
acl_set_file(const char *path_p, acl_type_t type, acl_t acl);
acl_set_link_np(const char *path_p, acl_type_t type, acl_t acl);
The acl_set_fd(), acl_set_fd_np(), acl_set_file(), and acl_set_link_np()
each associate an ACL with an object referred to by fd or path_p. The
acl_set_fd_np() and acl_set_link_np() functions are not POSIX.1e calls.
The acl_set_fd() function allows only the setting of ACLs of type
ACL_TYPE_EXTENDED where as acl_set_fd_np() allows the setting of ACLs of
The acl_set_link_np() function acts on a symlink rather than its target,
if the target of the path is a symlink. In the case of a symlink, this
function will return an error because ACLs are not currently supported on
symlinks. Note that the implementation is not atomic, and so the target
could change between the time it is checked as not being a symlink, and
the time the ACL is set.
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable errno is set to indicate the
If any of the following conditions occur, these functions shall return -1
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] Argument acl does not point to a valid ACL for this
object, or the ACL type specified in type is invalid
for this object, or both.
[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.
[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.
[EOPNOTSUPP] The file system does not support ACL retrieval.
[EROFS] This function requires modification of a file system
which is currently read-only.
SEE ALSOacl(3), acl_delete(3), acl_get(3), acl_valid(3), posix1e(3)STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
Robert N M Watson
BSD December 29, 2002 BSD