tty_conf.c revision 1.24.8.2
1 /* $NetBSD: tty_conf.c,v 1.24.8.2 2000/11/22 16:05:27 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)tty_conf.c 8.5 (Berkeley) 1/9/95 41 */ 42 43 #include "opt_compat_freebsd.h" 44 #include "opt_compat_43.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/buf.h> 49 #include <sys/ioctl.h> 50 #include <sys/proc.h> 51 #include <sys/tty.h> 52 #include <sys/ioctl.h> 53 #include <sys/ttycom.h> 54 #include <sys/conf.h> 55 #include <sys/malloc.h> 56 57 #include "tb.h" 58 #if NTB > 0 59 int tbopen __P((dev_t dev, struct tty *tp)); 60 int tbclose __P((struct tty *tp, int flags)); 61 int tbread __P((struct tty *tp, struct uio *uio, int flags)); 62 int tbtioctl __P((struct tty *tp, u_long cmd, caddr_t data, 63 int flag, struct proc *p)); 64 int tbinput __P((int c, struct tty *tp)); 65 #endif 66 67 #include "sl.h" 68 #if NSL > 0 69 int slopen __P((dev_t dev, struct tty *tp)); 70 int slclose __P((struct tty *tp, int flags)); 71 int sltioctl __P((struct tty *tp, u_long cmd, caddr_t data, 72 int flag, struct proc *p)); 73 int slinput __P((int c, struct tty *tp)); 74 int slstart __P((struct tty *tp)); 75 #endif 76 77 #include "ppp.h" 78 #if NPPP > 0 79 int pppopen __P((dev_t dev, struct tty *tp)); 80 int pppclose __P((struct tty *tp, int flags)); 81 int ppptioctl __P((struct tty *tp, u_long cmd, caddr_t data, 82 int flag, struct proc *p)); 83 int pppinput __P((int c, struct tty *tp)); 84 int pppstart __P((struct tty *tp)); 85 int pppread __P((struct tty *tp, struct uio *uio, int flag)); 86 int pppwrite __P((struct tty *tp, struct uio *uio, int flag)); 87 #endif 88 89 #include "strip.h" 90 #if NSTRIP > 0 91 int stripopen __P((dev_t dev, struct tty *tp)); 92 int stripclose __P((struct tty *tp, int flags)); 93 int striptioctl __P((struct tty *tp, u_long cmd, caddr_t data, 94 int flag, struct proc *p)); 95 int stripinput __P((int c, struct tty *tp)); 96 int stripstart __P((struct tty *tp)); 97 #endif 98 99 struct linesw termios_disc = 100 { "termios", 0, ttylopen, ttylclose, ttread, ttwrite, nullioctl, 101 ttyinput, ttstart, ttymodem }; /* 0- termios */ 102 struct linesw defunct_disc = 103 { "defunct", 1, ttynodisc, ttyerrclose, ttyerrio, ttyerrio, nullioctl, 104 ttyerrinput, ttyerrstart, nullmodem }; /* 1- defunct */ 105 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD) 106 struct linesw ntty_disc = 107 { "ntty", 2, ttylopen, ttylclose, ttread, ttwrite, nullioctl, 108 ttyinput, ttstart, ttymodem }; /* 2- old NTTYDISC */ 109 #endif 110 #if NTB > 0 111 struct linesw table_disc = 112 { "table", 3, tbopen, tbclose, tbread, ttyerrio, tbtioctl, 113 tbinput, ttstart, nullmodem }; /* 3- TABLDISC */ 114 #endif 115 #if NSL > 0 116 struct linesw slip_disc = 117 { "slip", 4, slopen, slclose, ttyerrio, ttyerrio, sltioctl, 118 slinput, slstart, nullmodem }; /* 4- SLIPDISC */ 119 #endif 120 #if NPPP > 0 121 struct linesw ppp_disc = 122 { "ppp", 5, pppopen, pppclose, pppread, pppwrite, ppptioctl, 123 pppinput, pppstart, ttymodem }; /* 5- PPPDISC */ 124 #endif 125 #if NSTRIP > 0 126 struct linesw strip_disc = 127 { "strip", 6, stripopen, stripclose, ttyerrio, ttyerrio, striptioctl, 128 stripinput, stripstart, nullmodem }; /* 6- STRIPDISC */ 129 #endif 130 131 /* 132 * Registered line disciplines. Don't use this 133 * it will go away. 134 */ 135 #define LSWITCHBRK 20 136 struct linesw **linesw = NULL; 137 int nlinesw = 0; 138 int slinesw = 0; 139 140 int nlinesw = sizeof(linesw) / sizeof(linesw[0]); 141 142 /* 143 * Do nothing specific version of line 144 * discipline specific ioctl command. 145 */ 146 /*ARGSUSED*/ 147 int 148 nullioctl(tp, cmd, data, flags, p) 149 struct tty *tp; 150 u_long cmd; 151 char *data; 152 int flags; 153 struct proc *p; 154 { 155 156 #ifdef lint 157 tp = tp; data = data; flags = flags; p = p; 158 #endif 159 return (-1); 160 } 161 162 /* 163 * Register a line discipline, optionally providing a 164 * specific discipline number for compatibility, -1 allocates 165 * a new one. Returns a discipline number, or -1 on 166 * failure. 167 */ 168 int 169 ttyldisc_add(disc, no) 170 struct linesw *disc; 171 int no; 172 { 173 174 /* You are not allowed to exceed TTLINEDNAMELEN */ 175 if (strlen(disc->l_name) > TTLINEDNAMELEN) 176 return (-1); 177 178 /* 179 * You are not allowed to specify a line switch 180 * compatibility number greater than 10. 181 */ 182 if (no > 10) 183 return (-1); 184 185 if (linesw == NULL) 186 panic("adding uninitialized linesw"); 187 188 if (no == -1) { 189 /* Hunt for any slot */ 190 191 for (no = slinesw; no-- > 0;) 192 if (linesw[no] == NULL) 193 break; 194 /* if no == -1 we should realloc linesw, but for now... */ 195 if (no == -1) 196 return (-1); 197 } 198 199 /* Need a specific slot */ 200 if (linesw[no] != NULL) 201 return (-1); 202 203 linesw[no] = disc; 204 disc->l_no = no; 205 206 /* Define size of table */ 207 if (no >= nlinesw) 208 nlinesw = no + 1; 209 210 return (no); 211 } 212 213 /* 214 * Remove a line discipline by its name. Returns the 215 * discipline on success or NULL on failure. 216 */ 217 struct linesw * 218 ttyldisc_remove(name) 219 char *name; 220 { 221 struct linesw *disc; 222 int i; 223 224 if (linesw == NULL) 225 panic("removing uninitialized linesw"); 226 227 for (i = 0; i < nlinesw; i++) { 228 if (linesw[i] && (strcmp(name, linesw[i]->l_name) == 0)) { 229 disc = linesw[i]; 230 linesw[i] = NULL; 231 232 if (nlinesw == i + 1) { 233 /* Need to fix up array sizing */ 234 while (i-- > 0 && linesw[i] == NULL) 235 continue; 236 nlinesw = i + 1; 237 } 238 return (disc); 239 } 240 } 241 return (NULL); 242 } 243 244 /* 245 * Look up a line discipline by its name. 246 */ 247 struct linesw * 248 ttyldisc_lookup(name) 249 char *name; 250 { 251 int i; 252 253 for (i = 0; i < nlinesw; i++) 254 if (linesw[i] && (strcmp(name, linesw[i]->l_name) == 0)) 255 return (linesw[i]); 256 return (NULL); 257 } 258 259 #define TTYLDISCINIT(s, v) \ 260 do { \ 261 if (ttyldisc_add(&(s), (v)) != (v)) \ 262 panic(__CONCAT("ttyldisc_init: ", __STRING(s))); \ 263 } while (0) 264 265 /* 266 * Register the basic line disciplines. 267 */ 268 void 269 ttyldisc_init() 270 { 271 272 /* Only initialize once */ 273 if (linesw) 274 return; 275 276 slinesw = LSWITCHBRK; 277 linesw = malloc(slinesw * sizeof(struct linesw *), 278 M_TTYS, M_WAITOK); 279 bzero(linesw, slinesw * sizeof(struct linesw *)); 280 281 TTYLDISCINIT(termios_disc, 0); 282 /* Do we really need this one? */ 283 TTYLDISCINIT(defunct_disc, 1); 284 285 /* 286 * The following should really be moved to 287 * initialization code for each module. 288 */ 289 290 #if defined(COMPAT_43) || defined(COMPAT_FREEBSD) 291 TTYLDISCINIT(ntty_disc, 2); 292 #endif 293 #if NTB > 0 294 TTYLDISCINIT(table_disc, 3); 295 #endif 296 #if NSL > 0 297 TTYLDISCINIT(slip_disc, 4); 298 #endif 299 #if NPPP > 0 300 TTYLDISCINIT(ppp_disc, 5); 301 #endif 302 #if NSTRIP > 0 303 TTYLDISCINIT(strip_disc, 6); 304 #endif 305 } 306
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