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.\" @(#)killpg.2 8.1 (Berkeley) 6/2/93 33.\" $FreeBSD$ 34.\" 35.Dd June 2, 1993 36.Dt KILLPG 2 37.Os BSD 4 38.Sh NAME 39.Nm killpg 40.Nd send signal to a process group 41.Sh SYNOPSIS 42.Fd #include <sys/types.h> 43.Fd #include <signal.h> 44.Ft int 45.Fn killpg "pid_t pgrp" "int sig" 46.Sh DESCRIPTION 47.Fn Killpg 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 that is a descendant of the current process. 66.Sh RETURN VALUES 67Upon successful completion, a value of 0 is returned. Otherwise, 68a value of -1 is returned and the global variable 69.Va errno 70is set to indicate the error. 71.Sh ERRORS 72.Fn Killpg 73will fail and no signal will be sent if: 74.Bl -tag -width Er 75.It Bq Er EINVAL 76.Fa Sig 77is not a valid signal number. 78.It Bq Er ESRCH 79No process can be found in the process group specified by 80.Fa pgrp . 81.It Bq Er ESRCH 82The process group was given as 0 83but the sending process does not have a process group. 84.It Bq Er EPERM 85The sending process is not the super-user and one or more 86of the target processes has an effective user ID different from that 87of the sending process. 88.El 89.Sh SEE ALSO 90.Xr getpgrp 2 , 91.Xr kill 2 , 92.Xr sigaction 2 93.Sh HISTORY 94The 95.Fn killpg 96function call appeared in 97.Bx 4.0 . 98