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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)killpg.2 8.1 (Berkeley) 6/2/93 33.\" $NetBSD: killpg.3,v 1.12 2002/02/07 07:00:09 ross Exp $ 34.\" 35.Dd June 2, 1993 36.Dt KILLPG 3 37.Os 38.Sh NAME 39.Nm killpg 40.Nd send signal to a process group 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.Fd #include \*[Lt]signal.h\*[Gt] 45.Ft int 46.Fn killpg "pid_t pgrp" "int sig" 47.Sh DESCRIPTION 48.Fn killpg 49sends the signal 50.Fa sig 51to the process group 52.Fa pgrp . 53See 54.Xr sigaction 2 55for a list of signals. 56If 57.Fa pgrp 58is 0, 59.Fn killpg 60sends the signal to the sending process's process group. 61.Pp 62The sending process and members of the process group must 63have the same effective user ID, or 64the sender must be the super-user. 65As a single special case the continue signal SIGCONT may be sent 66to any process that is a descendant of the current process. 67.Sh RETURN VALUES 68Upon successful completion, a value of 0 is returned. Otherwise, 69a value of -1 is returned and the global variable 70.Va errno 71is set to indicate the error. 72.Sh ERRORS 73.Fn killpg 74will fail and no signal will be sent if: 75.Bl -tag -width Er 76.It Bq Er EINVAL 77.Fa sig 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 call appeared in 98.Bx 4.0 . 99