1.\" Copyright (c) 1980, 1991 Regents of the University of California. 2.\" 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.\" $OpenBSD: killpg.3,v 1.13 2015/01/29 01:46:30 schwarze Exp $ 29.\" 30.Dd $Mdocdate: January 29 2015 $ 31.Dt KILLPG 3 32.Os 33.Sh NAME 34.Nm killpg 35.Nd send signal to a process group 36.Sh SYNOPSIS 37.In signal.h 38.Ft int 39.Fn killpg "pid_t pgrp" "int sig" 40.Sh DESCRIPTION 41.Fn killpg 42sends the signal 43.Fa sig 44to the process group 45.Fa pgrp . 46See 47.Xr sigaction 2 48for a list of signals. 49If 50.Fa pgrp 51is 0, 52.Fn killpg 53sends the signal to the sending process's process group. 54.Pp 55The sending process and members of the process group must 56have the same effective user ID, or 57the sender must be the superuser. 58As a single special case the continue signal SIGCONT may be sent 59to any process with the same session ID as the caller. 60.Sh RETURN VALUES 61.Rv -std 62.Sh ERRORS 63.Fn killpg 64will fail and no signal will be sent if: 65.Bl -tag -width Er 66.It Bq Er EINVAL 67.Fa sig 68is not a valid signal number. 69.It Bq Er ESRCH 70No process can be found in the process group specified by 71.Fa pgrp . 72.It Bq Er ESRCH 73The process group was given as 0 74but the sending process does not have a process group. 75.It Bq Er EPERM 76The sending process is not the superuser and one or more 77of the target processes has an effective user ID different from that 78of the sending process. 79.El 80.Sh SEE ALSO 81.Xr getpgrp 2 , 82.Xr kill 2 , 83.Xr sigaction 2 84.Sh HISTORY 85The 86.Fn killpg 87function call appeared in 88.Bx 4.0 . 89