ping.c revision 1.2.6.2
1 1.2.6.2 martin /* $NetBSD: ping.c,v 1.2.6.2 2020/04/13 08:05:11 martin Exp $ */ 2 1.2.6.2 martin 3 1.2.6.2 martin /*- 4 1.2.6.2 martin * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 1.2.6.2 martin * All rights reserved. 6 1.2.6.2 martin * 7 1.2.6.2 martin * Redistribution and use in source and binary forms, with or without 8 1.2.6.2 martin * modification, are permitted provided that the following conditions 9 1.2.6.2 martin * are met: 10 1.2.6.2 martin * 1. Redistributions of source code must retain the above copyright 11 1.2.6.2 martin * notice, this list of conditions and the following disclaimer. 12 1.2.6.2 martin * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.6.2 martin * notice, this list of conditions and the following disclaimer in the 14 1.2.6.2 martin * documentation and/or other materials provided with the distribution. 15 1.2.6.2 martin * 16 1.2.6.2 martin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.2.6.2 martin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.2.6.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.2.6.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.2.6.2 martin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.2.6.2 martin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.2.6.2 martin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.2.6.2 martin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.2.6.2 martin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.2.6.2 martin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.2.6.2 martin * POSSIBILITY OF SUCH DAMAGE. 27 1.2.6.2 martin */ 28 1.2.6.2 martin 29 1.2.6.2 martin #include <sys/cdefs.h> 30 1.2.6.2 martin __KERNEL_RCSID(0, "$NetBSD: ping.c,v 1.2.6.2 2020/04/13 08:05:11 martin Exp $"); 31 1.2.6.2 martin 32 1.2.6.2 martin #include <sys/param.h> 33 1.2.6.2 martin #include <sys/conf.h> 34 1.2.6.2 martin #include <sys/device.h> 35 1.2.6.2 martin #include <sys/kernel.h> 36 1.2.6.2 martin #include <sys/module.h> 37 1.2.6.2 martin 38 1.2.6.2 martin #include "ping.h" 39 1.2.6.2 martin 40 1.2.6.2 martin /* 41 1.2.6.2 martin * Create a device /dev/ping in order to test this module. 42 1.2.6.2 martin * 43 1.2.6.2 martin * To use this device you need to do: 44 1.2.6.2 martin * mknod /dev/ping b 351 0 45 1.2.6.2 martin * 46 1.2.6.2 martin */ 47 1.2.6.2 martin 48 1.2.6.2 martin dev_type_open(ping_open); 49 1.2.6.2 martin dev_type_close(ping_close); 50 1.2.6.2 martin dev_type_ioctl(ping_ioctl); 51 1.2.6.2 martin 52 1.2.6.2 martin static struct cdevsw ping_cdevsw = { 53 1.2.6.2 martin .d_open = noopen, 54 1.2.6.2 martin .d_close = noclose, 55 1.2.6.2 martin .d_read = noread, 56 1.2.6.2 martin .d_write = nowrite, 57 1.2.6.2 martin .d_ioctl = noioctl, 58 1.2.6.2 martin .d_stop = nostop, 59 1.2.6.2 martin .d_tty = notty, 60 1.2.6.2 martin .d_poll = nopoll, 61 1.2.6.2 martin .d_mmap = nommap, 62 1.2.6.2 martin .d_kqfilter = nokqfilter, 63 1.2.6.2 martin .d_discard = nodiscard, 64 1.2.6.2 martin .d_flag = D_OTHER 65 1.2.6.2 martin }; 66 1.2.6.2 martin 67 1.2.6.2 martin static struct bdevsw ping_bdevsw = { 68 1.2.6.2 martin .d_open = ping_open, 69 1.2.6.2 martin .d_close = ping_close, 70 1.2.6.2 martin .d_strategy = NULL, 71 1.2.6.2 martin .d_ioctl = ping_ioctl, 72 1.2.6.2 martin .d_dump = nodump, 73 1.2.6.2 martin .d_psize = nosize, 74 1.2.6.2 martin .d_discard = nodiscard, 75 1.2.6.2 martin .d_flag = D_OTHER 76 1.2.6.2 martin }; 77 1.2.6.2 martin 78 1.2.6.2 martin struct ping_softc { 79 1.2.6.2 martin int refcnt; 80 1.2.6.2 martin }; 81 1.2.6.2 martin 82 1.2.6.2 martin static struct ping_softc sc; 83 1.2.6.2 martin 84 1.2.6.2 martin int 85 1.2.6.2 martin ping_open(dev_t self __unused, int flag __unused, int mode __unused, 86 1.2.6.2 martin struct lwp *l __unused) 87 1.2.6.2 martin { 88 1.2.6.2 martin if (sc.refcnt > 0) 89 1.2.6.2 martin return EBUSY; 90 1.2.6.2 martin 91 1.2.6.2 martin ++sc.refcnt; 92 1.2.6.2 martin 93 1.2.6.2 martin return 0; 94 1.2.6.2 martin } 95 1.2.6.2 martin 96 1.2.6.2 martin int 97 1.2.6.2 martin ping_close(dev_t self __unused, int flag __unused, int mode __unused, 98 1.2.6.2 martin struct lwp *l __unused) 99 1.2.6.2 martin { 100 1.2.6.2 martin --sc.refcnt; 101 1.2.6.2 martin 102 1.2.6.2 martin return 0; 103 1.2.6.2 martin } 104 1.2.6.2 martin 105 1.2.6.2 martin int 106 1.2.6.2 martin ping_ioctl(dev_t self __unused, u_long cmd, void *data, int flag, 107 1.2.6.2 martin struct lwp *l __unused) 108 1.2.6.2 martin { 109 1.2.6.2 martin switch(cmd) { 110 1.2.6.2 martin case CMD_PING: 111 1.2.6.2 martin printf("ping: pong!\n"); 112 1.2.6.2 martin return 0; 113 1.2.6.2 martin default: 114 1.2.6.2 martin return ENOTTY; 115 1.2.6.2 martin } 116 1.2.6.2 martin } 117 1.2.6.2 martin 118 1.2.6.2 martin MODULE(MODULE_CLASS_MISC, ping, NULL); 119 1.2.6.2 martin 120 1.2.6.2 martin static int 121 1.2.6.2 martin ping_modcmd(modcmd_t cmd, void *arg __unused) 122 1.2.6.2 martin { 123 1.2.6.2 martin int bmajor = 351, cmajor = -1; 124 1.2.6.2 martin 125 1.2.6.2 martin switch (cmd) { 126 1.2.6.2 martin case MODULE_CMD_INIT: 127 1.2.6.2 martin if (devsw_attach("ping", &ping_bdevsw, &bmajor, &ping_cdevsw, &cmajor)) 128 1.2.6.2 martin return ENXIO; 129 1.2.6.2 martin return 0; 130 1.2.6.2 martin case MODULE_CMD_FINI: 131 1.2.6.2 martin if (sc.refcnt > 0) 132 1.2.6.2 martin return EBUSY; 133 1.2.6.2 martin 134 1.2.6.2 martin devsw_detach(&ping_bdevsw, &ping_cdevsw); 135 1.2.6.2 martin return 0; 136 1.2.6.2 martin default: 137 1.2.6.2 martin return ENOTTY; 138 1.2.6.2 martin } 139 1.2.6.2 martin } 140
Indexes created Sat Nov 01 05:10:12 GMT 2025