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+.\"-
+.\" Copyright (c) 2000 Robert N. M. Watson
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.\" TrustedBSD Project - support for POSIX.1e process capabilities 
+.\"
+.Dd April 1, 2000
+.Dt CAP_DUP 3
+.Os FreeBSD 5.0
+.Sh NAME
+.Nm cap_dup
+.Nd Duplicate a Capability State in Working Storage
+.Sh SYNOPSIS
+.Fd #include <sys/types.h>
+.Fd #include <sys/capability.h>
+.Ft cap_t
+.Fn cap_dup "cap_t cap_p"
+.Sh DESCRIPTION
+The
+.Fn cap_dup
+function returns a duplicate capability state in working storage given the
+source object
+.Ar cap_p ,
+allocating any memory necessary, and returning a pointer to the newly
+created capability state.
+Once duplicated, no operations on the either capability state shall affect
+the other in any way.
+.Pp
+This function may cause memory to be allocated.
+The caller should free any releasable memory, when the capability state in
+working storage is no longer required, by calling
+.Vn cap_free
+with the cap_t as an argument.
+.Sh IMPLEMENTATION NOTES
+FreeBSD's support for POSIX.1e interfaces and features is still under
+development at this time.
+.Sh RETURN VALUES
+Upon successful completion, the
+.Fn cap_dup
+function returns a pointer to the newly created capability state in working
+storage.
+Otherwise, a value of
+.Va (cap_t)NULL
+shall be returned and
+.Va errno
+shall be set to indicate the error.
+.Sh ERRORS
+If any of the following conditions occur, the
+.Fn cap_dup
+function shall return
+.Va (cap_t)NULL
+and set
+.Va errno
+to the corresponding value:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The value of the
+.Va cap_p
+argument does not refer to a capability state in the working storage.
+.It Bq Er ENOMEM
+The capability state to be returned requires more memory than is allowed by
+the hardware or system-imposed memory management constraints.
+.El
+.Sh SEE ALSO
+.Xr cap 3 ,
+.Xr cap_free 3 ,
+.Xr posix1e 3
+.Sh STANDARDS
+POSIX.1e is described in IEEE POSIX.1e draft 17.  Discussion
+of the draft continues on the cross-platform POSIX.1e implementation
+mailing list.  To join this list, see the
+.Fx
+POSIX.1e implementation
+page for more information.
+.Sh HISTORY
+Support for POSIX.1e Capabilities was developed as part of the TrustedBSD
+Project.
+POSIX.1e Capability support was introduced in
+.Fx 5.0 ,
+and development continues.
+.Sh AUTHORS
+.An Robert N M Watson