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Manual Pages  — ACL_SET


acl_set_fd, acl_set_fd_np, acl_set_file, acl_set_link_np – set an ACL for a file



Standard C Library (libc, -lc)


#include <sys/types.h>
#include <sys/acl.h>

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_ACCESS where as acl_set_fd_np() allows the setting of ACLs of any type. The acl_set_link_np() function acts on a symlink rather than its target, if the target of the path is a symlink.

Valid values for the type argument are:

POSIX.1e access ACL

POSIX.1e default ACL


Trying to set ACL_TYPE_NFS4 with acl branded as POSIX.1e, or ACL_TYPE_ACCESS or ACL_TYPE_DEFAULT with ACL branded as NFSv4, will result in error.


FreeBSD Ns 's support for POSIX.1e interfaces and features is still under development at this time.


Upon successful completion, the value 0 is returned; otherwise the value -1 is returned and the global variable errno is set to indicate the error.


If any of the following conditions occur, these functions shall return -1 and set errno to the corresponding value:
  Search permission is denied for a component of the path prefix, or the object exists and the process does not have appropriate access rights.
  The fd argument is not a valid file descriptor.
  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 there is branding mismatch.
  A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters.
  The named object does not exist, or the path_p argument points to an empty string.
  Insufficient memory available to fulfill request.
  The directory or file system that would contain the new ACL cannot be extended, or the file system is out of file allocation resources.
  The file system does not support ACL retrieval.
  This function requires modification of a file system which is currently read-only.


acl(3), acl_delete(3), acl_get(3), acl_get_brand_np(3), acl_valid(3), posix1e(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 information.


POSIX.1e support was introduced in FreeBSD 4.0, and development continues.


Robert N M Watson

ACL_SET (3) June 25, 2009

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C isn't that hard: void (*(*f[])())() defines f as an array of unspecified size, of pointers to functions that return pointers to functions that return void