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.Dd May 15, 2020 31.Dt PROCDESC 4 32.Os 33.Sh NAME 34.Nm procdesc 35.Nd process descriptor facility 36.Sh DESCRIPTION 37.Nm 38is a file-descriptor-oriented interface to process signalling and control, 39which supplements historic 40.Ux 41.Xr fork 2 42and 43.Xr kill 2 , 44primitives with 45new system calls such as 46.Xr pdfork 2 47and 48.Xr pdkill 2 , 49.Nm 50is designed for use with 51.Xr capsicum 4 , 52replacing process identifiers with capability-oriented references. 53However, it can also be used independently of 54.Xr capsicum 4 , 55displacing PIDs, which may otherwise suffer from race conditions. 56Given a process descriptor, it is possible to query its conventional PID using 57.Xr pdgetpid 2 . 58.Sh SEE ALSO 59.Xr fork 2 , 60.Xr kill 2 , 61.Xr pdfork 2 , 62.Xr pdgetpid 2 , 63.Xr pdkill 2 , 64.Xr kqueue 2 , 65.Xr wait4 2 , 66.Xr capsicum 4 67.Sh HISTORY 68.Nm 69first appeared in 70.Fx 9.0 , 71and was developed at the University of Cambridge. 72.Sh AUTHORS 73.Nm 74was developed by 75.An -nosplit 76.An Robert Watson Aq Mt rwatson@FreeBSD.org 77and 78.An Jonathan Anderson Aq Mt jonathan@FreeBSD.org 79at the University of Cambridge, and 80.An Ben Laurie Aq Mt benl@FreeBSD.org 81and 82.An Kris Kennaway Aq Mt kris@FreeBSD.org 83at Google, Inc. 84