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-.\" 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 December 1, 2019
-.Dt KILL 2
-.Os
-.Sh NAME
-.Nm kill
-.Nd send signal to a process
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/types.h
-.In signal.h
-.Ft int
-.Fn kill "pid_t pid" "int sig"
-.Sh DESCRIPTION
-The
-.Fn kill
-system call sends the signal given by
-.Fa sig
-to
-.Fa pid ,
-a
-process or a group of processes.
-The
-.Fa sig
-argument
-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 user must be the super-user, or
-the real or saved user ID of the receiving process must match
-the real or effective user ID of the sending process.
-A single exception is the signal SIGCONT, which may always be sent
-to any process with the same session ID as the sender.
-In addition, if the
-.Va security.bsd.conservative_signals
-.Xr sysctl 9
-is set to 1, the user is not a super-user, and
-the receiver is set-uid, then
-only job control and terminal control signals may
-be sent (in particular, only SIGKILL, SIGINT, SIGTERM, SIGALRM,
-SIGSTOP, SIGTTIN, SIGTTOU, SIGTSTP, SIGHUP, SIGUSR1, SIGUSR2).
-.Bl -tag -width Ds
-.It \&If Fa pid No \&is greater than zero :
-The
-.Fa sig
-signal
-is sent to the process whose ID is equal to
-.Fa pid .
-.It \&If Fa pid No \&is zero :
-The
-.Fa sig
-signal
-is sent to all processes whose 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 2 .
-.It \&If Fa pid No \&is -1 :
-If the user has super-user privileges,
-the signal is sent to all processes excluding
-system processes
-(with
-.Dv P_SYSTEM
-flag set),
-process with ID 1
-(usually
-.Xr init 8 ) ,
-and the process sending the signal.
-If the user is not the super user, the signal is sent to all processes
-which the caller has permissions to, excluding the process sending the signal.
-No error is returned if any process could be signaled.
-.El
-.Pp
-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 2 .
-.Sh RETURN VALUES
-.Rv -std kill
-.Sh ERRORS
-The
-.Fn kill
-system call
-will fail and no signal will be sent if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa sig
-argument
-is not a valid signal number.
-.It Bq Er ESRCH
-No process or process group can be found corresponding to that specified by
-.Fa pid .
-.It Bq Er EPERM
-The sending process does not have permission to send
-.Va sig
-to any receiving process.
-.El
-.Sh SEE ALSO
-.Xr getpgrp 2 ,
-.Xr getpid 2 ,
-.Xr killpg 2 ,
-.Xr sigaction 2 ,
-.Xr sigqueue 2 ,
-.Xr raise 3 ,
-.Xr init 8
-.Sh STANDARDS
-The
-.Fn kill
-system call is expected to conform to
-.St -p1003.1-90 .
-.Sh HISTORY
-A version of the
-.Fn kill
-function appeared in
-.At v3 .
-The signal number was added to the
-.Fn kill
-function in
-.At v4 .