1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)killpg.2 8.1 (Berkeley) 6/2/93 29.\" $FreeBSD$ 30.\" 31.Dd March 15, 2012 32.Dt KILLPG 2 33.Os 34.Sh NAME 35.Nm killpg 36.Nd send signal to a process group 37.Sh LIBRARY 38.Lb libc 39.Sh SYNOPSIS 40.In sys/types.h 41.In signal.h 42.Ft int 43.Fn killpg "pid_t pgrp" "int sig" 44.Sh DESCRIPTION 45The 46.Fn killpg 47function 48sends the signal 49.Fa sig 50to the process group 51.Fa pgrp . 52See 53.Xr sigaction 2 54for a list of signals. 55If 56.Fa pgrp 57is 0, 58.Fn killpg 59sends the signal to the sending process's process group. 60.Pp 61The sending process must be able to 62.Fn kill 63at least one process in the receiving process group. 64.Sh RETURN VALUES 65.Rv -std killpg 66.Sh ERRORS 67The 68.Fn killpg 69function 70will fail and no signal will be sent if: 71.Bl -tag -width Er 72.It Bq Er EINVAL 73The 74.Fa sig 75argument 76is not a valid signal number. 77.It Bq Er ESRCH 78No process can be found in the process group specified by 79.Fa pgrp . 80.It Bq Er EPERM 81.Fn kill 82returns EPERM for all processes in the process group. 83.El 84.Sh SEE ALSO 85.Xr getpgrp 2 , 86.Xr kill 2 , 87.Xr sigaction 2 88.Sh HISTORY 89The 90.Fn killpg 91function appeared in 92.Bx 4.0 . 93