1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)killpg.2 8.1 (Berkeley) 06/02/93 7.\" 8.Dd 9.Dt KILLPG 2 10.Os BSD 4 11.Sh NAME 12.Nm killpg 13.Nd send signal to a process group 14.Sh SYNOPSIS 15.Fd #include <signal.h> 16.Ft int 17.Fn killpg "pid_t pgrp" "int sig" 18.Sh DESCRIPTION 19.Fn Killpg 20sends the signal 21.Fa sig 22to the process group 23.Fa pgrp . 24See 25.Xr sigaction 2 26for a list of signals. 27If 28.Fa pgrp 29is 0, 30.Fn killpg 31sends the signal to the sending process's process group. 32.Pp 33The sending process and members of the process group must 34have the same effective user ID, or 35the sender must be the super-user. 36As a single special case the continue signal SIGCONT may be sent 37to any process that is a descendant of the current process. 38.Sh RETURN VALUES 39Upon successful completion, a value of 0 is returned. Otherwise, 40a value of -1 is returned and the global variable 41.Va errno 42is set to indicate the error. 43.Sh ERRORS 44.Fn Killpg 45will fail and no signal will be sent if: 46.Bl -tag -width Er 47.It Bq Er EINVAL 48.Fa Sig 49is not a valid signal number. 50.It Bq Er ESRCH 51No process can be found in the process group specified by 52.Fa pgrp . 53.It Bq Er ESRCH 54The process group was given as 0 55but the sending process does not have a process group. 56.It Bq Er EPERM 57The sending process is not the super-user and one or more 58of the target processes has an effective user ID different from that 59of the sending process. 60.El 61.Sh SEE ALSO 62.Xr kill 2 , 63.Xr getpgrp 2 , 64.Xr sigaction 2 65.Sh HISTORY 66The 67.Nm 68function call appeared in 69.Bx 4.0 . 70