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.\" 34.Dd June 2, 1993 35.Dt KILLPG 2 36.Os BSD 4 37.Sh NAME 38.Nm killpg 39.Nd send signal to a process group 40.Sh SYNOPSIS 41.Fd #include <signal.h> 42.Ft int 43.Fn killpg "pid_t pgrp" "int sig" 44.Sh DESCRIPTION 45.Fn Killpg 46sends the signal 47.Fa sig 48to the process group 49.Fa pgrp . 50See 51.Xr sigaction 2 52for a list of signals. 53If 54.Fa pgrp 55is 0, 56.Fn killpg 57sends the signal to the sending process's process group. 58.Pp 59The sending process and members of the process group must 60have the same effective user ID, or 61the sender must be the super-user. 62As a single special case the continue signal SIGCONT may be sent 63to any process that is a descendant of the current process. 64.Sh RETURN VALUES 65Upon successful completion, a value of 0 is returned. Otherwise, 66a value of -1 is returned and the global variable 67.Va errno 68is set to indicate the error. 69.Sh ERRORS 70.Fn Killpg 71will fail and no signal will be sent if: 72.Bl -tag -width Er 73.It Bq Er EINVAL 74.Fa Sig 75is not a valid signal number. 76.It Bq Er ESRCH 77No process can be found in the process group specified by 78.Fa pgrp . 79.It Bq Er ESRCH 80The process group was given as 0 81but the sending process does not have a process group. 82.It Bq Er EPERM 83The sending process is not the super-user and one or more 84of the target processes has an effective user ID different from that 85of the sending process. 86.El 87.Sh SEE ALSO 88.Xr kill 2 , 89.Xr getpgrp 2 , 90.Xr sigaction 2 91.Sh HISTORY 92The 93.Nm 94function call appeared in 95.Bx 4.0 . 96