Provided by: libacl1-dev_2.2.53-6_amd64 bug


     acl_to_any_text — convert an ACL to text


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


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

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


     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 corresponding 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 permissions which are ineffective because they
                   are masked by an ACL_MASK entry. The ACL entry and the comment are separated
                   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

                   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


     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.


     If any of the following conditions occur, the acl_to_any_text() function returns a value of
     (char *)NULL and sets errno to the corresponding 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 ACL.

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


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


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


     Written by Andreas Gruenbacher <>.