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+.\"	$OpenBSD: thrkill.2,v 1.2 2016/03/19 21:56:12 guenther Exp $
+.\"	$NetBSD: kill.2,v 1.7 1995/02/27 12:33:53 cgd Exp $
+.\"
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  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.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+.\"
+.\"     @(#)kill.2	8.3 (Berkeley) 4/19/94
+.\"
+.Dd $Mdocdate: March 19 2016 $
+.Dt THRKILL 2
+.Os
+.Sh NAME
+.Nm thrkill
+.Nd send signal to a thread in the same process
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fn thrkill "pid_t tid" "int sig" "void *tcb"
+.Sh DESCRIPTION
+The
+.Fn thrkill
+function sends the signal given by
+.Fa sig
+to
+.Fa tid ,
+a thread in the same process as the caller.
+.Fn thrkill
+will only succeed if
+.Fa tcb
+is either
+.Dv NULL
+or the address of the thread control block (TCB) of the target thread.
+.Fa sig
+may be one of the signals specified in
+.Xr sigaction 2
+or it may be 0, in which case
+error checking is performed but no
+signal is actually sent.
+.Pp
+If
+.Fa tid
+is zero then the current thread is targeted.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+.Fn thrkill
+will fail and no signal will be sent if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+.Fa sig
+is not a valid signal number.
+.It Bq Er ESRCH
+The process doesn't have a thread with thread ID
+.Fa tid .
+.It Bq Er ESRCH
+.Fa tcb
+is not
+.Dv NULL
+and not the TCB address of the thread with thread ID
+.Fa tid .
+.El
+.Sh SEE ALSO
+.Xr __get_tcb 2 ,
+.Xr kill 2 ,
+.Xr sigaction 2 ,
+.Xr pthread_kill 3 ,
+.Xr raise 3
+.Sh STANDARDS
+The
+.Fn thrkill
+function is specific to
+.Ox
+and should not be used in portable applications.
+Use
+.Xr pthread_kill 3
+instead.
+.Sh HISTORY
+The
+.Fn thrkill
+system call appeared in
+.Ox 5.9 .