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+.\"	$NetBSD: kill.2,v 1.24 2021/02/08 01:00:49 nia Exp $
+.\"
+.\" Copyright (c) 1980, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)kill.2	8.3 (Berkeley) 4/19/94
+.\"
+.Dd February 8, 2021
+.Dt KILL 2
+.Os
+.Sh NAME
+.Nm kill
+.Nd send signal to a process
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In signal.h
+.Ft int
+.Fn kill "pid_t pid" "int sig"
+.Sh DESCRIPTION
+The
+.Fn kill
+function sends the signal given by
+.Fa sig
+to
+.Fa pid ,
+a
+process or a group of processes.
+.Fa sig
+may be one of the signals specified in
+.Xr sigaction 2
+or it may be 0, in which case
+error checking is performed but no
+signal is actually sent.
+This can be used to check the validity of
+.Fa pid .
+.Pp
+For a process to have permission to send a signal to a process designated
+by
+.Fa pid ,
+the real or effective user ID of the receiving process must match
+that of the sending process or the user must have appropriate privileges
+(such as given by a set-user-ID program or the user is the super-user).
+A single exception is the signal SIGCONT, which may always be sent
+to any descendant of the current process.
+.Bl -tag -width Ds
+.It \&If Fa pid No \&is greater than zero :
+.Fa sig
+is sent to the process whose ID is equal to
+.Fa pid .
+.It \&If Fa pid No \&is zero :
+.Fa sig
+is sent to all processes whose process group ID is equal
+to the process group ID of the sender, and for which the
+process has permission;
+this is a variant of
+.Xr killpg 3 .
+.It \&If Fa pid No \&is \-1 :
+If the user has super-user privileges,
+the signal is sent to all processes excluding
+system processes and the process sending the signal.
+If the user is not the super user, the signal is sent to all processes
+with the same uid as the user excluding the process sending the signal.
+No error is returned if any process could be signaled, otherwise
+.Er ESRCH
+is returned.
+.El
+.Pp
+For compatibility with System V,
+if the process number is negative but not \-1,
+the signal is sent to all processes whose process group ID
+is equal to the absolute value of the process number.
+This is a variant of
+.Xr killpg 3 .
+.Pp
+If
+.Fa sig
+is equal to
+.Dv 0 ,
+then no signal is sent to the process ID or process group ID, but error
+checking is performed.
+This can be used to check if the process ID or process group ID exist.
+.Sh RETURN VALUES
+Upon successful completion, a value of 0 is returned.
+Otherwise, a value of \-1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn kill
+will fail and no signal will be sent if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+.Fa sig
+is not a valid signal number.
+.It Bq Er EPERM
+The sending process is not the super-user and its effective
+user id does not match the effective user-id of the receiving process.
+When signaling a process group, this error is returned if any members
+of the group could not be signaled.
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Fa pid ;
+or the process id was given as 0
+but the sending process does not have a process group.
+.El
+.Sh SEE ALSO
+.Xr getpgrp 2 ,
+.Xr getpid 2 ,
+.Xr sigaction 2 ,
+.Xr killpg 3 ,
+.Xr signal 7
+.Sh STANDARDS
+The
+.Fn kill
+function is expected to conform to
+.St -p1003.1-90 .