acl_to_text(3) — Linux manual page


ACL_FROM_TEXT(3)        BSD Library Functions Manual        ACL_FROM_TEXT(3)

NAME         top

     acl_to_text — convert an ACL to text

LIBRARY         top

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

SYNOPSIS         top

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

     char *
     acl_to_text(acl_t acl, ssize_t *len_p);

DESCRIPTION         top

     The acl_to_text() function translates the ACL pointed to by the argu‐
     ment acl into a NULL terminated character string.  If the pointer len_p
     is not NULL, then the function returns the length of the string (not
     including the NULL terminator) in the location pointed to by len_p.
     The format of the text string returned by acl_to_text() is the long
     text form defined in acl(5).  The ACL referred to by acl is not

     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 returned by acl_to_text() as an argu‐

RETURN VALUE         top

     On success, this function returns a pointer to the long text form 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_text() function
     returns a value of (char *)NULL and sets errno to the corresponding

     [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 a 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

     IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)

SEE ALSO         top

     acl_free(3), acl_to_any_text(3), acl(5)

AUTHOR         top

     Derived from the FreeBSD manual pages written by Robert N M Watson
     <>, and adapted for Linux 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
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     page), send a mail to

Linux ACL                      March 23, 2002                      Linux ACL