ACL_TO_TEXT(3) BSD Library Functions Manual ACL_TO_TEXT(3)NAME
acl_to_text, acl_to_text_np — convert an ACL to text
Standard C Library (libc, -lc)
acl_to_text(acl_t acl, ssize_t *len_p);
acl_to_text_np(acl_t acl, ssize_t *len_p, int flags);
The acl_to_text() and acl_to_text_np() functions translate the ACL
pointed to by argument acl into a NULL terminated character string. If
the pointer len_p is not NULL, then the function shall return the length
of the string (not including the NULL terminator) in the location pointed
to by len_p. If the ACL is POSIX.1e, the format of the text string
returned by acl_to_text() shall be the POSIX.1e long ACL form. If the
ACL is NFSv4, the format of the text string shall be the compact form,
unless the ACL_TEXT_VERBOSE flag is given.
The flags specified are formed by or'ing the following values
ACL_TEXT_VERBOSE Format ACL using verbose form
ACL_TEXT_NUMERIC_IDS Do not resolve IDs into user or group names
ACL_TEXT_APPEND_ID In addition to user and group names, append
This function allocates any memory necessary to contain the string and
returns a pointer to the string. The caller should free any releasable
memory, when the new string is no longer required, by calling acl_free(3)
with the (void*)char as an argument.
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
long text form of an ACL. Otherwise, a value of (char*)NULL shall be
returned and errno shall be set to indicate the error.
If any of the following conditions occur, the acl_to_text() function
shall return a value of (acl_t)NULL and set errno to the corresponding
[EINVAL] Argument acl does not point to a valid ACL.
The ACL denoted by acl contains one or more improperly
formed ACL entries, or for some other reason cannot be
translated into a text form of an ACL.
[ENOMEM] The character string to be returned requires more mem‐
ory than is allowed by the hardware or software-
imposed memory management constraints.
SEE ALSOacl(3), acl_free(3), acl_from_text(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
POSIX.1e support was introduced in FreeBSD 4.0, and development contin‐
Robert N M Watson
The acl_from_text() and acl_to_text() functions rely on the getpwent(3)
library calls to manage username and uid mapping, as well as the
getgrent(3) library calls to manage groupname and gid mapping. These
calls are not thread safe, and so transitively, neither are
acl_from_text() and acl_to_text(). These functions may also interfere
with stateful calls associated with the getpwent() and getgrent() calls.
BSD June 25, 2009 BSD