.\"	$OpenBSD: thrkill.2,v 1.1 2015/11/10 04:30:59 guenther Exp $
.\"	$NetBSD: kill.2,v 1.7 1995/02/27 12:33:53 cgd Exp $
.\"
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.\"     @(#)kill.2	8.3 (Berkeley) 4/19/94
.\"
.Dd $Mdocdate: November 10 2015 $
.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 __thrsigdivert
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 .