ACL_COPY_EXT(3)         BSD Library Functions Manual         ACL_COPY_EXT(3)

NAME         top

     acl_copy_ext — copy an ACL from internal to external representation

LIBRARY         top

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

SYNOPSIS         top

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

     acl_copy_ext(void *buf_p, acl_t acl, ssize_t size);

DESCRIPTION         top

     The acl_copy_ext() function copies the ACL pointed to by acl from sys‐
     tem-managed space to the user managed space pointed to by buf_p.  The
     size parameter represents the size in bytes of the buffer pointed to by
     buf_p.  The format of the ACL placed in the buffer pointed to by buf_p
     is a contiguous, persistent data item, the format of which is unspeci‐
     fied.  It is the responsibility of the invoker to allocate an area
     large enough to hold the copied ACL. The size of the exportable, con‐
     tiguous, persistent form of the ACL may be obtained by invoking the
     acl_size() function.

     Any ACL entry descriptors that refer to an entry in the ACL referenced
     by acl continue to refer to those entries. Any existing ACL pointers
     that refer to the ACL referenced by acl continue to refer to the ACL.

RETURN VALUE         top

     Upon success, this function returns the number of bytes placed in the
     buffer pointed to by buf_p.  On error, a value of (ssize_t)-1 is
     returned and errno is set appropriately.

ERRORS         top

     If any of the following conditions occur, the acl_copy_ext() function
     returns a value of (ssize_t)-1 and sets errno to the corresponding

     [EINVAL]           The size parameter is zero or negative.

                        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 external form
                        of an ACL.

     [ERANGE]           The size parameter is greater than zero but smaller
                        than the length of the contiguous, persistent form
                        of the ACL.

STANDARDS         top

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

SEE ALSO         top

     acl_copy_int(3), acl_size(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 2020-02-08.  (At that time,
     the date of the most recent commit that was found in the repository was
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Linux ACL                      March 23, 2002                      Linux ACL