acl_to_any_text(3) — Linux manual page


ACL_TO_ANY_TEXT(3)      BSD Library Functions Manual      ACL_TO_ANY_TEXT(3)

NAME         top

     acl_to_any_text — convert an ACL to text

LIBRARY         top

     Linux Access Control Lists library (libacl, -lacl).

SYNOPSIS         top

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

     char *
     acl_to_any_text(acl_t acl, const char *prefix, char separator,
         int options);

DESCRIPTION         top

     The acl_to_any_text() function translates the ACL pointed to by the
     argument acl into a NULL terminated character string. This character
     string is composed of the ACL entries contained in acl, in the entry
     text format described on acl(5).  Entries are separated from each other
     by the separator character. If the argument prefix is not (const char
     *)NULL, each entry is prefixed by this character string.

     If the argument options is 0, ACL entries are converted using the entry
     tag type keywords user, group, mask, and other.  User IDs and group IDs
     of ACL entries that contain such qualifiers are converted to their cor‐
     responding names; if an identifier has no corresponding name, a decimal
     number string is produced. The ACL text representation contains no
     additional comments.  A bitwise combinations of the following options
     can be used to modify the result:

                   Instead of the full tag type keywords, single letter
                   abbreviations are used.  The abbreviation for user is u,
                   the abbreviation for group is g, the abbreviation for
                   mask is m, and the abbreviation for other is o.

                   User IDs and group IDs are included as decimal numbers
                   instead of names.

                   A comment containing the effective permissions of the ACL
                   entry is included after ACL entries that contain permis‐
                   sions which are ineffective because they are masked by an
                   ACL_MASK entry. The ACL entry and the comment are sepa‐
                   rated by a tab character.

                   A comment containing the effective permissions of the ACL
                   entry is included after all ACL entries that are affected
                   by an ACL_MASK entry.  The comment is included even if
                   the permissions contained in the ACL entry equal the
                   effective permissions. The ACL entry and the comment are
                   separated by a tab character.

                   This option is used in combination with the
                   TEXT_SOME_EFFECTIVE or TEXT_ALL_EFFECTIVE option. The
                   number of tab characters inserted between the ACL entry
                   and the comment is increased so that the comment is
                   aligned to the fourth tab stop position.  A tab width of
                   8 characters is assumed.

     The ACL referred to by acl is not changed.

     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() with the (void*)char returned by acl_to_any_text() as an

RETURN VALUE         top

     On success, this function returns a pointer to the text representation
     of the ACL.  On error, a value of (char *)NULL is returned, and errno
     is set appropriately.

ERRORS         top

     If any of the following conditions occur, the acl_to_any_text() func‐
     tion returns a value of (char *)NULL and sets errno to the correspond‐
     ing value:

     [EINVAL]           The argument acl is not a valid pointer to an ACL.

                        The ACL referenced by acl contains one or more
                        improperly formed ACL entries, or for some other
                        reason cannot be translated into the text form of an

     [ENOMEM]           The character string to be returned requires more
                        memory than is allowed by the hardware or system-
                        imposed memory management constraints.

STANDARDS         top

     This is a non-portable, Linux specific extension to the ACL
     manipulation functions defined in IEEE Std 1003.1e draft 17
     (“POSIX.1e”, abandoned).

SEE ALSO         top

     acl_from_text(3), acl_to_text(3), acl_free(3), acl(5)

AUTHOR         top

     Written by Andreas Gruenbacher <>.

COLOPHON         top

     This page is part of the acl (manipulating access control lists)
     project.  Information about the project can be found at  If you have a bug report for
     this manual page, see ⟨⟩.
     This page was obtained from the project's upstream Git repository
     ⟨git://⟩ on 2020-09-18.  (At that time,
     the date of the most recent commit that was found in the repository was
     2020-09-03.)  If you discover any rendering problems in this HTML ver‐
     sion of the page, or you believe there is a better or more up-to-date
     source for the page, or you have corrections or improvements to the
     information in this COLOPHON (which is not part of the original manual
     page), send a mail to

Linux ACL                      March 25, 2002                      Linux ACL