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.\" 3. 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.\" 30.Dd March 15, 2012 31.Dt KILLPG 2 32.Os 33.Sh NAME 34.Nm killpg 35.Nd send signal to a process group 36.Sh LIBRARY 37.Lb libc 38.Sh SYNOPSIS 39.In sys/types.h 40.In signal.h 41.Ft int 42.Fn killpg "pid_t pgrp" "int sig" 43.Sh DESCRIPTION 44The 45.Fn killpg 46function 47sends the signal 48.Fa sig 49to the process group 50.Fa pgrp . 51See 52.Xr sigaction 2 53for a list of signals. 54If 55.Fa pgrp 56is 0, 57.Fn killpg 58sends the signal to the sending process's process group. 59.Pp 60The sending process must be able to 61.Fn kill 62at least one process in the receiving process group. 63.Sh RETURN VALUES 64.Rv -std killpg 65.Sh ERRORS 66The 67.Fn killpg 68function 69will fail and no signal will be sent if: 70.Bl -tag -width Er 71.It Bq Er EINVAL 72The 73.Fa sig 74argument 75is not a valid signal number. 76.It Bq Er ESRCH 77No process can be found in the process group specified by 78.Fa pgrp . 79.It Bq Er EPERM 80.Fn kill 81returns EPERM for all processes in the process group. 82.El 83.Sh SEE ALSO 84.Xr getpgrp 2 , 85.Xr kill 2 , 86.Xr sigaction 2 87.Sh HISTORY 88The 89.Fn killpg 90function appeared in 91.Bx 4.0 . 92