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. 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 6.5 (Berkeley) 3/10/91 33.\" $Id: killpg.3,v 1.5 1994/12/05 18:51:47 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt KILLPG 3 37.Os BSD 4 38.Sh NAME 39.Nm killpg 40.Nd send signal to a process group 41.Sh SYNOPSIS 42.Fd #include <signal.h> 43.Ft int 44.Fn killpg "pid_t pgrp" "int sig" 45.Sh DESCRIPTION 46.Fn Killpg 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 and members of the process group must 61have the same effective user ID, or 62the sender must be the super-user. 63As a single special case the continue signal SIGCONT may be sent 64to any process that is a descendant of the current process. 65.Sh RETURN VALUES 66Upon successful completion, a value of 0 is returned. Otherwise, 67a value of -1 is returned and the global variable 68.Va errno 69is set to indicate the error. 70.Sh ERRORS 71.Fn Killpg 72will fail and no signal will be sent if: 73.Bl -tag -width Er 74.It Bq Er EINVAL 75.Fa Sig 76is not a valid signal number. 77.It Bq Er ESRCH 78No process can be found in the process group specified by 79.Fa pgrp . 80.It Bq Er ESRCH 81The process group was given as 0 82but the sending process does not have a process group. 83.It Bq Er EPERM 84The sending process is not the super-user and one or more 85of the target processes has an effective user ID different from that 86of the sending process. 87.El 88.Sh SEE ALSO 89.Xr kill 2 , 90.Xr getpgrp 2 , 91.Xr sigaction 2 92.Sh HISTORY 93The 94.Fn killpg 95function call appeared in 96.Bx 4.0 . 97