NAME

     acl_copy_ext — copy an ACL from internal to external representation

LIBRARY

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

SYNOPSIS

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

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

DESCRIPTION

     The acl_copy_ext() function copies the ACL pointed to by acl from system-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 unspecified.  It is the
     responsibility of the invoker to allocate an area large enough to hold the copied ACL. The
     size of the exportable, contiguous, 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

     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

     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 value:

     [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

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

SEE ALSO

     acl_copy_int(3), acl_size(3), acl(5)

AUTHOR

     Derived from the FreeBSD manual pages written by Robert N M Watson <rwatson@FreeBSD.org>,
     and adapted for Linux by Andreas Gruenbacher <andreas.gruenbacher@gmail.com>.