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+.\"	$OpenBSD: tfind.9,v 1.3 2025/06/13 18:34:00 schwarze Exp $
+.\"
+.\" Copyright (c) 1999 Marc Espie
+.\" 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 ``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 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.
+.\"
+.Dd $Mdocdate: June 13 2025 $
+.Dt TFIND 9
+.Os
+.Sh NAME
+.Nm tfind ,
+.Nm prfind ,
+.Nm pgfind
+.Nd find thread, process and process group by number
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/signal.h
+.In sys/proc.h
+.Ft struct proc *
+.Fn tfind "pid_t tid"
+.Ft struct process *
+.Fn prfind "pid_t pid"
+.Ft struct pgrp *
+.Fn pgfind "pid_t pgid"
+.Sh DESCRIPTION
+The
+.Fn tfind ,
+.Fn prfind ,
+and
+.Fn pgfind
+functions retrieve thread, process and process group structures from thread,
+process and process group IDs, respectively.
+.Pp
+These functions return
+.Dv NULL
+if the requested ID can't be found.
+.Sh CODE REFERENCES
+Those functions are implemented in the file
+.Pa sys/kern/kern_proc.c .