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.\" from: @(#)killpg.2 8.1 (Berkeley) 6/2/93 29.\" $NetBSD: killpg.3,v 1.16 2003/08/07 16:42:39 agc Exp $ 30.\" 31.Dd June 2, 1993 32.Dt KILLPG 3 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 signal.h 41.Ft int 42.Fn killpg "pid_t pgrp" "int sig" 43.Sh DESCRIPTION 44.Fn killpg 45sends the signal 46.Fa sig 47to the process group 48.Fa pgrp . 49See 50.Xr sigaction 2 51for a list of signals. 52If 53.Fa pgrp 54is 0, 55.Fn killpg 56sends the signal to the sending process's process group. 57.Pp 58The sending process and members of the process group must 59have the same effective user ID, or 60the sender must be the super-user. 61As a single special case the continue signal SIGCONT may be sent 62to any process that is a descendant of the current process. 63.Sh RETURN VALUES 64Upon successful completion, a value of 0 is returned. 65Otherwise, a value of \-1 is returned and the global variable 66.Va errno 67is set to indicate the error. 68.Sh ERRORS 69.Fn killpg 70will fail and no signal will be sent if: 71.Bl -tag -width Er 72.It Bq Er EINVAL 73.Fa sig 74is not a valid signal number. 75.It Bq Er ESRCH 76No process can be found in the process group specified by 77.Fa pgrp . 78.It Bq Er ESRCH 79The process group was given as 0 80but the sending process does not have a process group. 81.It Bq Er EPERM 82The sending process is not the super-user and one or more 83of the target processes has an effective user ID different from that 84of the sending process. 85.El 86.Sh SEE ALSO 87.Xr getpgrp 2 , 88.Xr kill 2 , 89.Xr sigaction 2 90.Sh HISTORY 91The 92.Fn killpg 93function call appeared in 94.Bx 4.0 . 95