2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
132 lines
4.4 KiB
Groff
132 lines
4.4 KiB
Groff
.\" $NetBSD: kill.2,v 1.21 2008/07/13 15:16:26 dholland Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)kill.2 8.3 (Berkeley) 4/19/94
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.\"
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.Dd April 19, 1994
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.Dt KILL 2
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.Os
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.Sh NAME
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.Nm kill
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.Nd send signal to a process
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In signal.h
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.Ft int
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.Fn kill "pid_t pid" "int sig"
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.Sh DESCRIPTION
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The
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.Fn kill
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function sends the signal given by
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.Fa sig
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to
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.Fa pid ,
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a
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process or a group of processes.
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.Fa sig
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may be one of the signals specified in
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.Xr sigaction 2
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or it may be 0, in which case
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error checking is performed but no
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signal is actually sent.
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This can be used to check the validity of
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.Fa pid .
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.Pp
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For a process to have permission to send a signal to a process designated
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by
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.Fa pid ,
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the real or effective user ID of the receiving process must match
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that of the sending process or the user must have appropriate privileges
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(such as given by a set-user-ID program or the user is the super-user).
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A single exception is the signal SIGCONT, which may always be sent
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to any descendant of the current process.
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.Bl -tag -width Ds
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.It \&If Fa pid No \&is greater than zero :
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.Fa sig
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is sent to the process whose ID is equal to
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.Fa pid .
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.It \&If Fa pid No \&is zero :
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.Fa sig
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is sent to all processes whose process group ID is equal
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to the process group ID of the sender, and for which the
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process has permission;
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this is a variant of
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.Xr killpg 3 .
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.It \&If Fa pid No \&is \-1 :
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If the user has super-user privileges,
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the signal is sent to all processes excluding
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system processes and the process sending the signal.
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If the user is not the super user, the signal is sent to all processes
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with the same uid as the user excluding the process sending the signal.
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No error is returned if any process could be signaled.
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.El
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.Pp
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For compatibility with System V,
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if the process number is negative but not \-1,
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the signal is sent to all processes whose process group ID
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is equal to the absolute value of the process number.
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This is a variant of
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.Xr killpg 3 .
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.Sh RETURN VALUES
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Upon successful completion, a value of 0 is returned.
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Otherwise, a value of \-1 is returned and
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn kill
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will fail and no signal will be sent if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.Fa sig
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is not a valid signal number.
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.It Bq Er ESRCH
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No process can be found corresponding to that specified by
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.Fa pid .
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.It Bq Er ESRCH
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The process id was given as 0
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but the sending process does not have a process group.
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.It Bq Er EPERM
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The sending process is not the super-user and its effective
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user id does not match the effective user-id of the receiving process.
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When signaling a process group, this error is returned if any members
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of the group could not be signaled.
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.El
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.Sh SEE ALSO
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.Xr getpgrp 2 ,
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.Xr getpid 2 ,
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.Xr sigaction 2 ,
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.Xr killpg 3 ,
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.Xr signal 7
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.Sh STANDARDS
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The
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.Fn kill
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function is expected to conform to
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.St -p1003.1-90 .
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