acl_to_text(3) - NetBSD Manual Pages

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ACL_TO_TEXT(3)          NetBSD Library Functions Manual         ACL_TO_TEXT(3)


NAME

     acl_to_text, acl_to_text_np -- convert an ACL to text


LIBRARY

     Standard C Library (libc, -lc)


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

     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
                                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 mem-
                        ory than is allowed by the hardware or software-
                        imposed memory management constraints.


SEE ALSO

     acl(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
     information.


HISTORY

     POSIX.1e support was introduced in FreeBSD 4.0, and development contin-
     ues.


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.

NetBSD 10.0                      June 25, 2009                     NetBSD 10.0