NAME
acl_to_text,
acl_to_text_np —
convert an ACL to text
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/types.h>
#include <sys/acl.h>
char *
acl_to_text(acl_t
acl, ssize_t
*len_p);
char *
acl_to_text_np(acl_t
acl, ssize_t
*len_p, int
flags);
DESCRIPTION
Theacl_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 numeric IDs |
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.
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 long text form of an ACL. Otherwise, a value of (char*)NULL shall be returned and errno shall be set to indicate the error.
ERRORS
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 value:
- [
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 memory than is allowed by the hardware or software-imposed memory management constraints.
SEE ALSO
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 development continues.
AUTHORS
Robert N M Watson
BUGS
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.