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      1  1.2  pgoyette /*	$NetBSD: ping.c,v 1.2 2020/02/05 14:10:47 pgoyette Exp $	*/
      2  1.1     kamil 
      3  1.1     kamil /*-
      4  1.1     kamil  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  1.1     kamil  * All rights reserved.
      6  1.1     kamil  *
      7  1.1     kamil  * Redistribution and use in source and binary forms, with or without
      8  1.1     kamil  * modification, are permitted provided that the following conditions
      9  1.1     kamil  * are met:
     10  1.1     kamil  * 1. Redistributions of source code must retain the above copyright
     11  1.1     kamil  *    notice, this list of conditions and the following disclaimer.
     12  1.1     kamil  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.1     kamil  *    notice, this list of conditions and the following disclaimer in the
     14  1.1     kamil  *    documentation and/or other materials provided with the distribution.
     15  1.1     kamil  *
     16  1.1     kamil  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  1.1     kamil  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  1.1     kamil  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  1.1     kamil  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  1.1     kamil  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  1.1     kamil  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  1.1     kamil  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  1.1     kamil  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  1.1     kamil  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  1.1     kamil  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  1.1     kamil  * POSSIBILITY OF SUCH DAMAGE.
     27  1.1     kamil  */
     28  1.1     kamil 
     29  1.1     kamil #include <sys/cdefs.h>
     30  1.2  pgoyette __KERNEL_RCSID(0, "$NetBSD: ping.c,v 1.2 2020/02/05 14:10:47 pgoyette Exp $");
     31  1.1     kamil 
     32  1.1     kamil #include <sys/param.h>
     33  1.1     kamil #include <sys/conf.h>
     34  1.1     kamil #include <sys/device.h>
     35  1.1     kamil #include <sys/kernel.h>
     36  1.1     kamil #include <sys/module.h>
     37  1.1     kamil 
     38  1.1     kamil #include "ping.h"
     39  1.1     kamil 
     40  1.1     kamil /*
     41  1.1     kamil  * Create a device /dev/ping in order to test this module.
     42  1.1     kamil  *
     43  1.1     kamil  * To use this device you need to do:
     44  1.1     kamil  *     mknod /dev/ping b 351 0
     45  1.1     kamil  *
     46  1.1     kamil  */
     47  1.1     kamil 
     48  1.1     kamil dev_type_open(ping_open);
     49  1.1     kamil dev_type_close(ping_close);
     50  1.1     kamil dev_type_ioctl(ping_ioctl);
     51  1.1     kamil 
     52  1.1     kamil static struct cdevsw ping_cdevsw = {
     53  1.1     kamil 	.d_open = noopen,
     54  1.1     kamil 	.d_close = noclose,
     55  1.1     kamil 	.d_read = noread,
     56  1.1     kamil 	.d_write = nowrite,
     57  1.1     kamil 	.d_ioctl = noioctl,
     58  1.1     kamil 	.d_stop = nostop,
     59  1.1     kamil 	.d_tty = notty,
     60  1.1     kamil 	.d_poll = nopoll,
     61  1.1     kamil 	.d_mmap = nommap,
     62  1.1     kamil 	.d_kqfilter = nokqfilter,
     63  1.1     kamil 	.d_discard = nodiscard,
     64  1.1     kamil 	.d_flag = D_OTHER
     65  1.1     kamil };
     66  1.1     kamil 
     67  1.1     kamil static struct bdevsw ping_bdevsw = {
     68  1.1     kamil 	.d_open = ping_open,
     69  1.1     kamil 	.d_close = ping_close,
     70  1.1     kamil 	.d_strategy = NULL,
     71  1.1     kamil 	.d_ioctl = ping_ioctl,
     72  1.1     kamil 	.d_dump = nodump,
     73  1.1     kamil 	.d_psize = nosize,
     74  1.1     kamil 	.d_discard = nodiscard,
     75  1.1     kamil 	.d_flag = D_OTHER
     76  1.1     kamil };
     77  1.1     kamil 
     78  1.1     kamil struct ping_softc {
     79  1.1     kamil 	int		refcnt;
     80  1.1     kamil };
     81  1.1     kamil 
     82  1.1     kamil static struct ping_softc sc;
     83  1.1     kamil 
     84  1.1     kamil int
     85  1.1     kamil ping_open(dev_t self __unused, int flag __unused, int mode __unused,
     86  1.1     kamil           struct lwp *l __unused)
     87  1.1     kamil {
     88  1.1     kamil 	if (sc.refcnt > 0)
     89  1.1     kamil 		return EBUSY;
     90  1.1     kamil 
     91  1.1     kamil 	++sc.refcnt;
     92  1.1     kamil 
     93  1.1     kamil 	return 0;
     94  1.1     kamil }
     95  1.1     kamil 
     96  1.1     kamil int
     97  1.1     kamil ping_close(dev_t self __unused, int flag __unused, int mode __unused,
     98  1.1     kamil            struct lwp *l __unused)
     99  1.1     kamil {
    100  1.1     kamil 	--sc.refcnt;
    101  1.1     kamil 
    102  1.1     kamil 	return 0;
    103  1.1     kamil }
    104  1.1     kamil 
    105  1.1     kamil int
    106  1.1     kamil ping_ioctl(dev_t self __unused, u_long cmd, void *data, int flag,
    107  1.1     kamil            struct lwp *l __unused)
    108  1.1     kamil {
    109  1.1     kamil 	switch(cmd) {
    110  1.1     kamil 	case CMD_PING:
    111  1.1     kamil 		printf("ping: pong!\n");
    112  1.1     kamil 		return 0;
    113  1.1     kamil 	default:
    114  1.2  pgoyette 		return ENOTTY;
    115  1.1     kamil 	}
    116  1.1     kamil }
    117  1.1     kamil 
    118  1.1     kamil MODULE(MODULE_CLASS_MISC, ping, NULL);
    119  1.1     kamil 
    120  1.1     kamil static int
    121  1.1     kamil ping_modcmd(modcmd_t cmd, void *arg __unused)
    122  1.1     kamil {
    123  1.1     kamil 	int bmajor = 351, cmajor = -1;
    124  1.1     kamil 
    125  1.1     kamil 	switch (cmd) {
    126  1.1     kamil 	case MODULE_CMD_INIT:
    127  1.1     kamil 		if (devsw_attach("ping", &ping_bdevsw, &bmajor, &ping_cdevsw, &cmajor))
    128  1.1     kamil 			return ENXIO;
    129  1.1     kamil 		return 0;
    130  1.1     kamil 	case MODULE_CMD_FINI:
    131  1.1     kamil 		if (sc.refcnt > 0)
    132  1.1     kamil 			return EBUSY;
    133  1.1     kamil 
    134  1.1     kamil 		devsw_detach(&ping_bdevsw, &ping_cdevsw);
    135  1.1     kamil 		return 0;
    136  1.1     kamil 	default:
    137  1.1     kamil 		return ENOTTY;
    138  1.1     kamil 	}
    139  1.1     kamil }
    140