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 October 14, 2018 33.Dt PROCDESC 4 34.Os 35.Sh NAME 36.Nm procdesc 37.Nd process descriptor facility 38.Sh DESCRIPTION 39.Nm 40is a file-descriptor-oriented interface to process signalling and control, 41which supplements historic 42.Ux 43.Xr fork 2 , 44.Xr kill 2 , 45and 46.Xr wait4 2 47primitives with 48new system calls such as 49.Xr pdfork 2 , 50.Xr pdkill 2 , 51and 52.Xr pdwait4 2 . 53.Nm 54is designed for use with 55.Xr capsicum 4 , 56replacing process identifiers with capability-oriented references. 57However, it can also be used independently of 58.Xr capsicum 4 , 59displacing PIDs, which may otherwise suffer from race conditions. 60Given a process descriptor, it is possible to query its conventional PID using 61.Xr pdgetpid 2 . 62.Sh SEE ALSO 63.Xr fork 2 , 64.Xr kill 2 , 65.Xr pdfork 2 , 66.Xr pdgetpid 2 , 67.Xr pdkill 2 , 68.Xr pdwait4 2 , 69.Xr kqueue 2 , 70.Xr wait4 2 , 71.Xr capsicum 4 72.Sh HISTORY 73.Nm 74first appeared in 75.Fx 9.0 , 76and was developed at the University of Cambridge. 77.Sh AUTHORS 78.Nm 79was developed by 80.An -nosplit 81.An Robert Watson Aq Mt rwatson@FreeBSD.org 82and 83.An Jonathan Anderson Aq Mt jonathan@FreeBSD.org 84at the University of Cambridge, and 85.An Ben Laurie Aq Mt benl@FreeBSD.org 86and 87.An Kris Kennaway Aq Mt kris@FreeBSD.org 88at Google, Inc. 89