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 October 10, 2006 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 and members of the process group must 62have the same effective user ID, or 63the sender must be the super-user. 64As a single special case the continue signal SIGCONT may be sent 65to any process with the same session ID as the caller. 66.Sh RETURN VALUES 67.Rv -std killpg 68.Sh ERRORS 69The 70.Fn killpg 71function 72will fail and no signal will be sent if: 73.Bl -tag -width Er 74.It Bq Er EINVAL 75The 76.Fa sig 77argument 78is not a valid signal number. 79.It Bq Er ESRCH 80No process can be found in the process group specified by 81.Fa pgrp . 82.It Bq Er ESRCH 83The process group was given as 0 84but the sending process does not have a process group. 85.It Bq Er EPERM 86The sending process is not the super-user and one or more 87of the target processes has an effective user ID different from that 88of the sending process. 89.El 90.Sh SEE ALSO 91.Xr getpgrp 2 , 92.Xr kill 2 , 93.Xr sigaction 2 94.Sh HISTORY 95The 96.Fn killpg 97function appeared in 98.Bx 4.0 . 99