acl_get(3)

NAME

acl_get_fd, acl_get_fd_np, acl_get_file, acl_get_link_np

get an ACL for
a file

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/types.h>
#include <sys/acl.h>
acl_t
acl_get_fd(int fd);
acl_t
acl_get_fd_np(int fd, acl_type_t type);
acl_t
acl_get_file(const char *path_p, acl_type_t type);
acl_t
acl_get_link_np(const char *path_p, acl_type_t type);

DESCRIPTION

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 re

quired, 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 associated with the object referred to by fd. The ACL in the

working storage
shall not participate in any access control decisions.

IMPLEMENTATION NOTES

FreeBSD's support for POSIX.1e interfaces and features is

still under
development at this time.

RETURN VALUES

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.

ERRORS

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 corre

sponding value:

[EACCES] Search permission is denied for a compo

nent 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 de

scriptor.

[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 charac

ters.

[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 re

trieval.

SEE ALSO

acl(3), acl_free(3), acl_get(3), acl_set(3), posix1e(3)

STANDARDS

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.

HISTORY

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

ment continues.

AUTHORS

Robert N M Watson

BSD December 29, 2002

BSD