ping.c revision 1.1.2.2
1 1.1.2.2 snj /* $NetBSD: ping.c,v 1.1.2.2 2015/06/03 06:51:40 snj Exp $ */ 2 1.1.2.2 snj 3 1.1.2.2 snj /*- 4 1.1.2.2 snj * Copyright (c) 2015 The NetBSD Foundation, Inc. 5 1.1.2.2 snj * All rights reserved. 6 1.1.2.2 snj * 7 1.1.2.2 snj * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 snj * modification, are permitted provided that the following conditions 9 1.1.2.2 snj * are met: 10 1.1.2.2 snj * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 snj * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 snj * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 snj * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 snj * documentation and/or other materials provided with the distribution. 15 1.1.2.2 snj * 16 1.1.2.2 snj * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.1.2.2 snj * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.1.2.2 snj * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.1.2.2 snj * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.1.2.2 snj * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.1.2.2 snj * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.1.2.2 snj * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.1.2.2 snj * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.1.2.2 snj * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.1.2.2 snj * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.1.2.2 snj * POSSIBILITY OF SUCH DAMAGE. 27 1.1.2.2 snj */ 28 1.1.2.2 snj 29 1.1.2.2 snj #include <sys/cdefs.h> 30 1.1.2.2 snj __KERNEL_RCSID(0, "$NetBSD: ping.c,v 1.1.2.2 2015/06/03 06:51:40 snj Exp $"); 31 1.1.2.2 snj 32 1.1.2.2 snj #include <sys/param.h> 33 1.1.2.2 snj #include <sys/conf.h> 34 1.1.2.2 snj #include <sys/device.h> 35 1.1.2.2 snj #include <sys/kernel.h> 36 1.1.2.2 snj #include <sys/module.h> 37 1.1.2.2 snj 38 1.1.2.2 snj #include "ping.h" 39 1.1.2.2 snj 40 1.1.2.2 snj /* 41 1.1.2.2 snj * Create a device /dev/ping in order to test this module. 42 1.1.2.2 snj * 43 1.1.2.2 snj * To use this device you need to do: 44 1.1.2.2 snj * mknod /dev/ping c 210 0 45 1.1.2.2 snj * 46 1.1.2.2 snj */ 47 1.1.2.2 snj 48 1.1.2.2 snj dev_type_open(ping_open); 49 1.1.2.2 snj dev_type_close(ping_close); 50 1.1.2.2 snj dev_type_ioctl(ping_ioctl); 51 1.1.2.2 snj 52 1.1.2.2 snj static struct cdevsw ping_cdevsw = { 53 1.1.2.2 snj .d_open = ping_open, 54 1.1.2.2 snj .d_close = ping_close, 55 1.1.2.2 snj .d_read = noread, 56 1.1.2.2 snj .d_write = nowrite, 57 1.1.2.2 snj .d_ioctl = ping_ioctl, 58 1.1.2.2 snj .d_stop = nostop, 59 1.1.2.2 snj .d_tty = notty, 60 1.1.2.2 snj .d_poll = nopoll, 61 1.1.2.2 snj .d_mmap = nommap, 62 1.1.2.2 snj .d_kqfilter = nokqfilter, 63 1.1.2.2 snj .d_discard = nodiscard, 64 1.1.2.2 snj .d_flag = D_OTHER 65 1.1.2.2 snj }; 66 1.1.2.2 snj 67 1.1.2.2 snj 68 1.1.2.2 snj struct ping_softc { 69 1.1.2.2 snj int refcnt; 70 1.1.2.2 snj }; 71 1.1.2.2 snj 72 1.1.2.2 snj static struct ping_softc sc; 73 1.1.2.2 snj 74 1.1.2.2 snj int 75 1.1.2.2 snj ping_open(dev_t self __unused, int flag __unused, int mode __unused, 76 1.1.2.2 snj struct lwp *l __unused) 77 1.1.2.2 snj { 78 1.1.2.2 snj if (sc.refcnt > 0) 79 1.1.2.2 snj return EBUSY; 80 1.1.2.2 snj 81 1.1.2.2 snj ++sc.refcnt; 82 1.1.2.2 snj 83 1.1.2.2 snj return 0; 84 1.1.2.2 snj } 85 1.1.2.2 snj 86 1.1.2.2 snj int 87 1.1.2.2 snj ping_close(dev_t self __unused, int flag __unused, int mode __unused, 88 1.1.2.2 snj struct lwp *l __unused) 89 1.1.2.2 snj { 90 1.1.2.2 snj --sc.refcnt; 91 1.1.2.2 snj 92 1.1.2.2 snj return 0; 93 1.1.2.2 snj } 94 1.1.2.2 snj 95 1.1.2.2 snj int 96 1.1.2.2 snj ping_ioctl(dev_t self __unused, u_long cmd, void *data, int flag, 97 1.1.2.2 snj struct lwp *l __unused) 98 1.1.2.2 snj { 99 1.1.2.2 snj switch(cmd) { 100 1.1.2.2 snj case CMD_PING: 101 1.1.2.2 snj printf("ping: pong!\n"); 102 1.1.2.2 snj return 0; 103 1.1.2.2 snj default: 104 1.1.2.2 snj return 1; 105 1.1.2.2 snj } 106 1.1.2.2 snj } 107 1.1.2.2 snj 108 1.1.2.2 snj MODULE(MODULE_CLASS_MISC, ping, NULL); 109 1.1.2.2 snj 110 1.1.2.2 snj static int 111 1.1.2.2 snj ping_modcmd(modcmd_t cmd, void *arg __unused) 112 1.1.2.2 snj { 113 1.1.2.2 snj /* The major should be verified and changed if needed to avoid 114 1.1.2.2 snj * conflicts with other devices. */ 115 1.1.2.2 snj int cmajor = 210, bmajor = -1; 116 1.1.2.2 snj 117 1.1.2.2 snj switch (cmd) { 118 1.1.2.2 snj case MODULE_CMD_INIT: 119 1.1.2.2 snj if (devsw_attach("ping", NULL, &bmajor, &ping_cdevsw, &cmajor)) 120 1.1.2.2 snj return ENXIO; 121 1.1.2.2 snj return 0; 122 1.1.2.2 snj case MODULE_CMD_FINI: 123 1.1.2.2 snj if (sc.refcnt > 0) 124 1.1.2.2 snj return EBUSY; 125 1.1.2.2 snj 126 1.1.2.2 snj devsw_detach(NULL, &ping_cdevsw); 127 1.1.2.2 snj return 0; 128 1.1.2.2 snj default: 129 1.1.2.2 snj return ENOTTY; 130 1.1.2.2 snj } 131 1.1.2.2 snj } 132
Indexes created Fri Oct 03 15:10:06 GMT 2025