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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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. 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
-.\"	$Id: kill.2,v 1.6 1997/02/22 15:03:55 peter Exp $
-.\"
-.Dd April 19, 1994
-.Dt KILL 2
-.Os BSD 4
-.Sh NAME
-.Nm kill
-.Nd send signal to a process
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <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 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 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.
-.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 2 .
-.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 [EINVAL]
-.It Bq Er EINVAL
-.Fa Sig
-is not a valid signal number.
-.It Bq Er ESRCH
-No process can be found corresponding to that specified by
-.Fa pid .
-.It Bq Er ESRCH
-The process id was given as 0
-but the sending process does not have a process group.
-.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.
-.El
-.Sh SEE ALSO
-.Xr getpgrp 2 ,
-.Xr getpid 2 ,
-.Xr killpg 2 ,
-.Xr sigaction 2
-.Sh STANDARDS
-The
-.Fn kill
-function call is expected to conform to 
-.St -p1003.1-90 .
-.Sh HISTORY
-A
-.Fn kill
-function call appeared in
-.At v7 .