.\" Access Control Lists manual pages

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.\" (C) 2002 Andreas Gruenbacher, <a.gruenbacher@bestbits.at>

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.Dd March 23, 2002

.Dt ACL_COPY_EXT 3

.Os "Linux ACL"

.Sh NAME

.Nm acl_copy_ext

.Nd copy an ACL from internal to external representation

.Sh LIBRARY

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

.Sh SYNOPSIS

.In sys/types.h

.In sys/acl.h

.Ft ssize_t

.Fn acl_copy_ext "void *buf_p" "acl_t acl" "ssize_t size"

.Sh DESCRIPTION

The

.Fn acl_copy_ext

function copies the ACL pointed to by

.Va acl

from system-managed space to the user managed space pointed to by

.Va buf_p .

The

.Va size

parameter represents the size in bytes of the buffer pointed to by

.Va buf_p .

The format of the ACL placed in the buffer pointed to by

.Va 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

.Fn acl_size

function.

.Pp

Any ACL entry descriptors that refer to an entry in the ACL referenced by

.Va acl

continue to refer to those entries. Any existing ACL pointers that refer

to the ACL referenced by

.Va acl

continue to refer to the ACL.

.Sh RETURN VALUE

Upon success, this function returns the number of bytes placed in the buffer pointed to by

.Va buf_p .

On error, a value of

.Li (ssize_t)-1

is returned and

.Va errno

is set appropriately.

.Sh ERRORS

If any of the following conditions occur, the

.Fn acl_copy_ext

function returns a value of

.Li (ssize_t)-1

and sets

.Va errno

to the corresponding value:

.Bl -tag -width Er

.It Bq Er EINVAL

The

.Va size

parameter is zero or negative.

.Pp

The argument

.Va acl

is not a valid pointer to an ACL.

.Pp

The ACL referenced by

.Va acl

contains one or more improperly formed ACL entries, or for some other

reason cannot be translated into the external form of an ACL.

.It Bq Er ERANGE

The

.Va size

parameter is greater than zero but smaller than the length of the contiguous, persistent form of the ACL.

.El

.Sh STANDARDS

IEEE Std 1003.1e draft 17 (\(lqPOSIX.1e\(rq, abandoned)

.Sh SEE ALSO

.Xr acl_copy_int 3 ,

.Xr acl_size 3 ,

.Xr acl 5

.Sh AUTHOR

Derived from the FreeBSD manual pages written by

.An "Robert N M Watson" Aq rwatson@FreeBSD.org ,

and adapted for Linux by

.An "Andreas Gruenbacher" Aq a.gruenbacher@bestbits.at .