1.\" Copyright (c) 2016 The FreeBSD Foundation, Inc. 2.\" All rights reserved. 3.\" 4.\" This documentation was written by 5.\" Konstantin Belousov <[email protected]> under sponsorship 6.\" from the FreeBSD Foundation. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd June 1, 2016 32.Dt THR_kill 2 33.Os 34.Sh NAME 35.Nm thr_kill 36.Nd send signal to thread 37.Sh LIBRARY 38.Lb libc 39.Sh SYNOPSIS 40.In sys/thr.h 41.Ft int 42.Fn thr_kill "long id" "int sig" 43.Ft int 44.Fn thr_kill2 "pid_t pid" "long id" "int sig" 45.Sh DESCRIPTION 46The 47.Fn thr_kill 48and 49.Fn thr_kill2 50system calls allow sending a signal, specified by the 51.Fa sig 52argument, to some threads in a process. 53For the 54.Fn thr_kill 55function, signalled threads are always limited to the current process. 56For the 57.Fn thr_kill2 58function, the 59.Fa pid 60argument specifies the process with threads to be signalled. 61.Pp 62The 63.Fa id 64argument specifies which threads get the signal. 65If 66.Fa id 67is equal to \-1, all threads in the specified process are signalled. 68Otherwise, only the thread with the thread identifier equal to the 69argument is signalled. 70.Pp 71The 72.Fa sig 73argument defines the delivered signal. 74It must be a valid signal number or zero. 75In the latter case no signal is actually sent, and the call is used to 76verify the liveness of the thread. 77.Pp 78The signal is delivered with 79.Dv siginfo 80.Dv si_code 81set to 82.Dv SI_LWP . 83.Sh RETURN VALUES 84If successful, 85.Fn thr_kill 86and 87.Fn thr_kill2 88will return zero, otherwise \-1 is returned, and 89.Va errno 90is set to indicate the error. 91.Sh ERRORS 92The 93.Fn thr_kill 94and 95.Fn thr_kill2 96operations return the following errors: 97.Bl -tag -width Er 98.It Bq Er EINVAL 99The 100.Fa sig 101argument is not zero and does not specify valid signal. 102.It Bq Er ESRCH 103The specified process or thread was not found. 104.El 105.Pp 106Additionally, the 107.Fn thr_kill2 108may return the following errors: 109.Bl -tag -width Er 110.It Bq Er EPERM 111The current process does not have sufficient privilege to check existence or 112send a signal to the specified process. 113.El 114.Sh SEE ALSO 115.Xr kill 2 , 116.Xr thr_exit 2 , 117.Xr thr_new 2 , 118.Xr thr_self 2 , 119.Xr thr_set_name 2 , 120.Xr _umtx_op 2 , 121.Xr pthread_kill 3 , 122.Xr signal 3 123.Sh STANDARDS 124The 125.Fn thr_kill 126and 127.Fn thr_kill2 128system calls are non-standard and are used by the 129.Lb libthr 130to implement 131.St -p1003.1-2001 132.Xr pthread 3 133functionality. 134