Import new example kernel module ping_block
Subbmitted by Nisarg Joshi.
This commit is contained in:
kamil
parent
9ff9477c65
commit
9ecc7056f0
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@ -1,4 +1,4 @@
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# $NetBSD: Makefile,v 1.7 2019/01/17 20:47:42 kamil Exp $
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# $NetBSD: Makefile,v 1.8 2020/02/05 13:23:42 kamil Exp $
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.include <bsd.own.mk>
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@ -9,6 +9,7 @@ SUBDIR+= luareadhappy # Needs an additional Lua script
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SUBDIR+= mapper # Needs an additional helper program
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SUBDIR+= panic_string # Crashes the system
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SUBDIR+= ping # Needs an additional helper program
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SUBDIR+= ping_block # Needs an additional helper program
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SUBDIR+= properties
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SUBDIR+= readhappy
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SUBDIR+= readhappy_mpsafe # Contains an additional helper program
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@ -1,4 +1,4 @@
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$NetBSD: README,v 1.9 2019/01/17 20:47:42 kamil Exp $
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$NetBSD: README,v 1.10 2020/02/05 13:23:42 kamil Exp $
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Kernel Developer's Manual
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@ -70,5 +70,8 @@ HISTORY
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The mapper module first appeared in NetBSD 9.0 and was authored by
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Akul Pillai.
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The ping_block module first appeared in NetBSD 10.0 and was authored by
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Nisarg Joshi.
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AUTHORS
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This document was written by Kamil Rytarowski.
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@ -0,0 +1,18 @@
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# $NetBSD: Makefile,v 1.1 2020/02/05 13:23:42 kamil Exp $
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.include "../Makefile.inc"
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#S?= /usr/src/sys
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KMOD= ping_block
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SRCS= ping.c
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.include <bsd.kmodule.mk>
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# To make use of this module, you'll need to separately build the
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# cmd_ping program, with a Makefile similar to
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#
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# MKMAN= NO
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# PROG= cmd_ping
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# .include <bsd.prog.mk>
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@ -0,0 +1,61 @@
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/* $NetBSD: cmd_ping.c,v 1.1 2020/02/05 13:23:42 kamil Exp $ */
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/*-
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* Copyright (c) 2015 The NetBSD Foundation, Inc.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: cmd_ping.c,v 1.1 2020/02/05 13:23:42 kamil Exp $");
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include "ping.h"
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#define _PATH_DEV_PING "/dev/ping"
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int main(int argc, char **argv)
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{
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int devfd;
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setprogname(argv[0]);
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if ((devfd = open(_PATH_DEV_PING, O_RDWR)) == -1)
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err(EXIT_FAILURE, "Cannot open %s", _PATH_DEV_PING);
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if (ioctl(devfd, CMD_PING) == -1)
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err(EXIT_FAILURE, "ping failed");
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printf("%s: ping sent successfully\n", getprogname());
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if (close(devfd) == -1)
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err(EXIT_FAILURE, "Cannot close %s", _PATH_DEV_PING);
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return EXIT_SUCCESS;
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}
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@ -0,0 +1,139 @@
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/* $NetBSD: ping.c,v 1.1 2020/02/05 13:23:42 kamil Exp $ */
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/*-
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* Copyright (c) 2020 The NetBSD Foundation, Inc.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ping.c,v 1.1 2020/02/05 13:23:42 kamil Exp $");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include "ping.h"
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/*
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* Create a device /dev/ping in order to test this module.
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*
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* To use this device you need to do:
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* mknod /dev/ping b 351 0
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*
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*/
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dev_type_open(ping_open);
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dev_type_close(ping_close);
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dev_type_ioctl(ping_ioctl);
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static struct cdevsw ping_cdevsw = {
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.d_open = noopen,
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.d_close = noclose,
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.d_read = noread,
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.d_write = nowrite,
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.d_ioctl = noioctl,
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.d_stop = nostop,
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.d_tty = notty,
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.d_poll = nopoll,
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.d_mmap = nommap,
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.d_kqfilter = nokqfilter,
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.d_discard = nodiscard,
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.d_flag = D_OTHER
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};
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static struct bdevsw ping_bdevsw = {
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.d_open = ping_open,
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.d_close = ping_close,
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.d_strategy = NULL,
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.d_ioctl = ping_ioctl,
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.d_dump = nodump,
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.d_psize = nosize,
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.d_discard = nodiscard,
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.d_flag = D_OTHER
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};
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struct ping_softc {
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int refcnt;
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};
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static struct ping_softc sc;
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int
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ping_open(dev_t self __unused, int flag __unused, int mode __unused,
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struct lwp *l __unused)
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{
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if (sc.refcnt > 0)
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return EBUSY;
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++sc.refcnt;
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return 0;
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}
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int
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ping_close(dev_t self __unused, int flag __unused, int mode __unused,
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struct lwp *l __unused)
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{
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--sc.refcnt;
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return 0;
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}
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int
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ping_ioctl(dev_t self __unused, u_long cmd, void *data, int flag,
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struct lwp *l __unused)
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{
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switch(cmd) {
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case CMD_PING:
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printf("ping: pong!\n");
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return 0;
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default:
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return 1;
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}
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}
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MODULE(MODULE_CLASS_MISC, ping, NULL);
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static int
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ping_modcmd(modcmd_t cmd, void *arg __unused)
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{
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int bmajor = 351, cmajor = -1;
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switch (cmd) {
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case MODULE_CMD_INIT:
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if (devsw_attach("ping", &ping_bdevsw, &bmajor, &ping_cdevsw, &cmajor))
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return ENXIO;
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return 0;
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case MODULE_CMD_FINI:
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if (sc.refcnt > 0)
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return EBUSY;
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devsw_detach(&ping_bdevsw, &ping_cdevsw);
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return 0;
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default:
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return ENOTTY;
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}
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}
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#ifndef _PING_H_
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#define _PING_H_
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#include <sys/ioccom.h>
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#define CMD_PING _IO('p', 2)
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#endif /* _PING_H_ */
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