1.\" 2.\" Copyright (c) 2013 Robert N. M. Watson 3.\" All rights reserved. 4.\" 5.\" This software was developed by SRI International and the University of 6.\" Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 7.\" ("CTSRD"), as part of the DARPA CRASH research programme. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" $FreeBSD$ 31.\" 32.Dd August 21, 2013 33.Dt PROCDESC 4 34.Os 35.Sh NAME 36.Nm procdesc 37.Nd process descriptor facility 38.Sh SYNOPSIS 39.Cd "options PROCDESC" 40.Sh DESCRIPTION 41.Nm 42is a file-descriptor-oriented interface to process signalling and control, 43which supplements historic 44.Ux 45.Xr fork 2 , 46.Xr kill 2 , 47and 48.Xr wait4 2 49primitives with 50new system calls such as 51.Xr pdfork 2 , 52.Xr pdkill 2 , 53and 54.Xr pdwait4 2 . 55.Nm 56is designed for use with 57.Xr capsicum 4 , 58replacing process identifiers with capability-oriented references. 59However, it can also be used independently of 60.Xr capsicum 4 , 61displacing PIDs, which may otherwise suffer from race conditions. 62Given a process descriptor, it is possible to query its conventional PID using 63.Xr pdgetpid 2 . 64.Sh SEE ALSO 65.Xr fork 2 , 66.Xr kill 2 , 67.Xr wait4 2 , 68.Xr pdfork 2 , 69.Xr pdgetpid 2 , 70.Xr pdkill 2 , 71.Xr pdwait4 2 , 72.Xr capsicum 4 73.Sh HISTORY 74.Nm 75first appeared in 76.Fx 9.0 , 77and was developed at the University of Cambridge. 78.Sh AUTHORS 79.Nm 80was developed by 81.An -nosplit 82.An "Robert Watson" Aq rwatson@FreeBSD.org 83and 84.An "Jonathan Anderson" Aq jonathan@FreeBSD.org 85at the University of Cambridge, and 86.An "Ben Laurie" Aq benl@FreeBSD.org 87and 88.An "Kris Kennaway" Aq kris@FreeBSD.org 89at Google, Inc. 90.Sh BUGS 91.Nm 92is considered experimental in 93.Fx . 94