1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * MT STREAMS Virtual Console Redirection Device Driver 31 */ 32 33 #include <sys/types.h> 34 #include <sys/param.h> 35 #include <sys/errno.h> 36 #include <sys/kmem.h> 37 #include <sys/stat.h> 38 #include <sys/stream.h> 39 #include <sys/stropts.h> 40 #include <sys/strsun.h> 41 #include <sys/debug.h> 42 #include <sys/thread.h> 43 #include <sys/conf.h> 44 #include <sys/ddi.h> 45 #include <sys/sunddi.h> 46 #include <sys/tty.h> 47 #include <sys/cvc.h> 48 #include <sys/conf.h> 49 #include <sys/modctl.h> 50 51 52 /* 53 * Routine to to register/unregister our queue for console output and pass 54 * redirected data to the console. The cvc driver will do a putnext using 55 * our queue, so we will not see the redirected console data. 56 */ 57 extern int cvc_redir(mblk_t *); 58 extern int cvc_register(queue_t *); 59 extern int cvc_unregister(queue_t *); 60 61 static int cvcr_info(dev_info_t *, ddi_info_cmd_t, void *, void **); 62 static int cvcr_attach(dev_info_t *, ddi_attach_cmd_t); 63 static int cvcr_detach(dev_info_t *, ddi_detach_cmd_t); 64 static int cvcr_wput(queue_t *, mblk_t *); 65 static int cvcr_open(queue_t *, dev_t *, int, int, cred_t *); 66 static int cvcr_close(queue_t *, int, cred_t *); 67 static void cvcr_ioctl(queue_t *, mblk_t *); 68 69 static dev_info_t *cvcr_dip; 70 static int cvcr_suspend = 0; 71 72 static struct module_info minfo = { 73 1314, /* mi_idnum Bad luck number +1 ;-) */ 74 "cvcredir", /* mi_idname */ 75 0, /* mi_minpsz */ 76 INFPSZ, /* mi_maxpsz */ 77 2048, /* mi_hiwat */ 78 2048 /* mi_lowat */ 79 }; 80 81 static struct qinit cvcr_rinit = { 82 NULL, /* qi_putp */ 83 NULL, /* qi_srvp */ 84 cvcr_open, /* qi_qopen */ 85 cvcr_close, /* qi_qclose */ 86 NULL, /* qi_qadmin */ 87 &minfo, /* qi_minfo */ 88 NULL /* qi_mstat */ 89 }; 90 91 static struct qinit cvcr_winit = { 92 cvcr_wput, /* qi_putp */ 93 NULL, /* qi_srvp */ 94 cvcr_open, /* qi_qopen */ 95 cvcr_close, /* qi_qclose */ 96 NULL, /* qi_qadmin */ 97 &minfo, /* qi_minfo */ 98 NULL /* qi_mstat */ 99 }; 100 101 struct streamtab cvcrinfo = { 102 &cvcr_rinit, /* st_rdinit */ 103 &cvcr_winit, /* st_wrinit */ 104 NULL, /* st_muxrinit */ 105 NULL /* st_muxwrinit */ 106 }; 107 108 DDI_DEFINE_STREAM_OPS(cvcrops, nulldev, nulldev, cvcr_attach, 109 cvcr_detach, nodev, cvcr_info, (D_MTPERQ | D_MP), &cvcrinfo); 110 111 char _depends_on[] = "drv/cvc"; 112 113 static struct modldrv modldrv = { 114 &mod_driverops, /* Type of module. This one is a pseudo driver */ 115 "CVC redirect driver 'cvcredir' v%I%", 116 &cvcrops, /* driver ops */ 117 }; 118 119 static struct modlinkage modlinkage = { 120 MODREV_1, 121 &modldrv, 122 NULL 123 }; 124 125 int 126 _init(void) 127 { 128 return (mod_install(&modlinkage)); 129 } 130 131 int 132 _fini(void) 133 { 134 return (mod_remove(&modlinkage)); 135 } 136 137 int 138 _info(struct modinfo *modinfop) 139 { 140 return (mod_info(&modlinkage, modinfop)); 141 } 142 143 static int 144 cvcr_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 145 { 146 #ifdef lint 147 cvcr_suspend = cvcr_suspend; 148 #endif 149 if (cmd == DDI_RESUME) { 150 cvcr_suspend = 0; 151 } else { 152 if (ddi_create_minor_node(devi, "cvcredir", S_IFCHR, 153 0, DDI_PSEUDO, NULL) == DDI_FAILURE) { 154 ddi_remove_minor_node(devi, NULL); 155 return (-1); 156 } 157 cvcr_dip = devi; 158 } 159 return (DDI_SUCCESS); 160 } 161 162 static int 163 cvcr_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 164 { 165 if (cmd == DDI_SUSPEND) { 166 cvcr_suspend = 1; 167 } else { 168 if (cmd != DDI_DETACH) { 169 return (DDI_FAILURE); 170 } 171 ddi_remove_minor_node(dip, NULL); 172 } 173 return (DDI_SUCCESS); 174 } 175 176 /* ARGSUSED */ 177 static int 178 cvcr_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) 179 { 180 register int error; 181 182 switch (infocmd) { 183 case DDI_INFO_DEVT2DEVINFO: 184 if (cvcr_dip == NULL) { 185 error = DDI_FAILURE; 186 } else { 187 *result = (void *)cvcr_dip; 188 error = DDI_SUCCESS; 189 } 190 break; 191 case DDI_INFO_DEVT2INSTANCE: 192 *result = (void *)0; 193 error = DDI_SUCCESS; 194 break; 195 default: 196 error = DDI_FAILURE; 197 } 198 return (error); 199 } 200 201 /* ARGSUSED */ 202 static int 203 cvcr_open(queue_t *q, dev_t *dev, int flag, int sflag, cred_t *cred) 204 { 205 WR(q)->q_ptr = q->q_ptr = (char *)2; 206 /* 207 * call into the cvc driver to register our queue. cvc will use 208 * our queue to send console output data upstream (our stream)to 209 * cvcd which has us open and is reading console data. 210 */ 211 if (cvc_register(RD(q)) == -1) { 212 cmn_err(CE_WARN, "cvcr_open: cvc_register failed for q = 0x%p", 213 q); 214 } 215 return (0); 216 } 217 218 /* ARGSUSED */ 219 static int 220 cvcr_close(queue_t *q, int flag, cred_t *cred) 221 { 222 /* 223 * call into the cvc driver to un-register our queue. cvc will 224 * no longer use our queue to send console output data upstream. 225 */ 226 cvc_unregister(RD(q)); 227 WR(q)->q_ptr = q->q_ptr = NULL; 228 return (0); 229 } 230 231 static int 232 cvcr_wput(queue_t *q, mblk_t *mp) 233 { 234 /* 235 * Handle BREAK key for debugger and TIOCSWINSZ. 236 */ 237 if (mp->b_datap->db_type == M_IOCTL) { 238 cvcr_ioctl(q, mp); 239 return (0); 240 } 241 /* 242 * Call into the cvc driver to put console input data on 243 * its upstream queue to be picked up by the console driver. 244 */ 245 if (cvc_redir(mp) != 0) 246 freemsg(mp); 247 return (0); 248 } 249 250 static void 251 cvcr_ioctl(queue_t *q, mblk_t *mp) 252 { 253 struct iocblk *iocp = (struct iocblk *)mp->b_rptr; 254 int error; 255 256 switch (iocp->ioc_cmd) { 257 case CVC_BREAK: 258 abort_sequence_enter(NULL); 259 miocack(q, mp, 0, 0); 260 break; 261 262 case CVC_DISCONNECT: 263 case TIOCSWINSZ: 264 /* 265 * Generate a SIGHUP or SIGWINCH to the console. Note in this 266 * case cvc_redir does not free up mp, so we can reuse it for 267 * the ACK/NAK. 268 */ 269 error = cvc_redir(mp); 270 if (error != 0) 271 miocnak(q, mp, 0, error); 272 else 273 miocack(q, mp, 0, 0); 274 break; 275 276 default: 277 miocnak(q, mp, 0, EINVAL); 278 break; 279 } 280 } 281