| 1 | /* Serial interface for local (hardwired) serial ports on Un*x like systems |
| 2 | Copyright 1992, 1993 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "serial.h" |
| 22 | #include <fcntl.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/time.h> |
| 25 | |
| 26 | #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY) |
| 27 | #define HAVE_SGTTY |
| 28 | #endif |
| 29 | |
| 30 | #ifdef HAVE_TERMIOS |
| 31 | #include <termios.h> |
| 32 | #include <unistd.h> |
| 33 | |
| 34 | struct hardwire_ttystate |
| 35 | { |
| 36 | struct termios termios; |
| 37 | }; |
| 38 | #endif |
| 39 | |
| 40 | #ifdef HAVE_TERMIO |
| 41 | #include <termio.h> |
| 42 | |
| 43 | struct hardwire_ttystate |
| 44 | { |
| 45 | struct termio termio; |
| 46 | }; |
| 47 | #endif |
| 48 | |
| 49 | #ifdef HAVE_SGTTY |
| 50 | #include <sgtty.h> |
| 51 | |
| 52 | struct hardwire_ttystate |
| 53 | { |
| 54 | struct sgttyb sgttyb; |
| 55 | }; |
| 56 | #endif |
| 57 | |
| 58 | static int hardwire_open PARAMS ((serial_t scb, const char *name)); |
| 59 | static void hardwire_raw PARAMS ((serial_t scb)); |
| 60 | static int wait_for PARAMS ((serial_t scb, int timeout)); |
| 61 | static int hardwire_readchar PARAMS ((serial_t scb, int timeout)); |
| 62 | static int rate_to_code PARAMS ((int rate)); |
| 63 | static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate)); |
| 64 | static int hardwire_write PARAMS ((serial_t scb, const char *str, int len)); |
| 65 | static void hardwire_restore PARAMS ((serial_t scb)); |
| 66 | static void hardwire_close PARAMS ((serial_t scb)); |
| 67 | static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state)); |
| 68 | static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state)); |
| 69 | static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb)); |
| 70 | static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); |
| 71 | |
| 72 | /* Open up a real live device for serial I/O */ |
| 73 | |
| 74 | static int |
| 75 | hardwire_open(scb, name) |
| 76 | serial_t scb; |
| 77 | const char *name; |
| 78 | { |
| 79 | scb->fd = open (name, O_RDWR); |
| 80 | if (scb->fd < 0) |
| 81 | return -1; |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static int |
| 87 | get_tty_state(scb, state) |
| 88 | serial_t scb; |
| 89 | struct hardwire_ttystate *state; |
| 90 | { |
| 91 | #ifdef HAVE_TERMIOS |
| 92 | return tcgetattr(scb->fd, &state->termios); |
| 93 | #endif |
| 94 | |
| 95 | #ifdef HAVE_TERMIO |
| 96 | return ioctl (scb->fd, TCGETA, &state->termio); |
| 97 | #endif |
| 98 | |
| 99 | #ifdef HAVE_SGTTY |
| 100 | return ioctl (scb->fd, TIOCGETP, &state->sgttyb); |
| 101 | #endif |
| 102 | } |
| 103 | |
| 104 | static int |
| 105 | set_tty_state(scb, state) |
| 106 | serial_t scb; |
| 107 | struct hardwire_ttystate *state; |
| 108 | { |
| 109 | int err; |
| 110 | |
| 111 | #ifdef HAVE_TERMIOS |
| 112 | return tcsetattr(scb->fd, TCSANOW, &state->termios); |
| 113 | #endif |
| 114 | |
| 115 | #ifdef HAVE_TERMIO |
| 116 | return ioctl (scb->fd, TCSETA, &state->termio); |
| 117 | #endif |
| 118 | |
| 119 | #ifdef HAVE_SGTTY |
| 120 | return ioctl (scb->fd, TIOCSETP, &state->sgttyb); |
| 121 | #endif |
| 122 | } |
| 123 | |
| 124 | static serial_ttystate |
| 125 | hardwire_get_tty_state(scb) |
| 126 | serial_t scb; |
| 127 | { |
| 128 | struct hardwire_ttystate *state; |
| 129 | |
| 130 | state = (struct hardwire_ttystate *)xmalloc(sizeof *state); |
| 131 | |
| 132 | if (get_tty_state(scb, state)) |
| 133 | return NULL; |
| 134 | |
| 135 | return (serial_ttystate)state; |
| 136 | } |
| 137 | |
| 138 | static int |
| 139 | hardwire_set_tty_state(scb, ttystate) |
| 140 | serial_t scb; |
| 141 | serial_ttystate ttystate; |
| 142 | { |
| 143 | struct hardwire_ttystate *state; |
| 144 | |
| 145 | state = (struct hardwire_ttystate *)ttystate; |
| 146 | |
| 147 | return set_tty_state(scb, state); |
| 148 | } |
| 149 | |
| 150 | static void |
| 151 | hardwire_raw(scb) |
| 152 | serial_t scb; |
| 153 | { |
| 154 | struct hardwire_ttystate state; |
| 155 | |
| 156 | if (get_tty_state(scb, &state)) |
| 157 | fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno)); |
| 158 | |
| 159 | #ifdef HAVE_TERMIOS |
| 160 | state.termios.c_iflag = 0; |
| 161 | state.termios.c_oflag = 0; |
| 162 | state.termios.c_lflag = 0; |
| 163 | state.termios.c_cflag &= ~(CSIZE|PARENB); |
| 164 | state.termios.c_cflag |= CS8; |
| 165 | state.termios.c_cc[VMIN] = 0; |
| 166 | state.termios.c_cc[VTIME] = 0; |
| 167 | #endif |
| 168 | |
| 169 | #ifdef HAVE_TERMIO |
| 170 | state.termio.c_iflag = 0; |
| 171 | state.termio.c_oflag = 0; |
| 172 | state.termio.c_lflag = 0; |
| 173 | state.termio.c_cflag &= ~(CSIZE|PARENB); |
| 174 | state.termio.c_cflag |= CS8; |
| 175 | state.termio.c_cc[VMIN] = 0; |
| 176 | state.termio.c_cc[VTIME] = 0; |
| 177 | #endif |
| 178 | |
| 179 | #ifdef HAVE_SGTTY |
| 180 | state.sgttyb.sg_flags |= RAW | ANYP; |
| 181 | state.sgttyb.sg_flags &= ~(CBREAK | ECHO); |
| 182 | #endif |
| 183 | |
| 184 | scb->current_timeout = 0; |
| 185 | |
| 186 | if (set_tty_state (scb, &state)) |
| 187 | fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno)); |
| 188 | } |
| 189 | |
| 190 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, |
| 191 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. |
| 192 | |
| 193 | For termio{s}, we actually just setup VTIME if necessary, and let the |
| 194 | timeout occur in the read() in hardwire_read(). |
| 195 | */ |
| 196 | |
| 197 | static int |
| 198 | wait_for(scb, timeout) |
| 199 | serial_t scb; |
| 200 | int timeout; |
| 201 | { |
| 202 | int numfds; |
| 203 | |
| 204 | #ifdef HAVE_SGTTY |
| 205 | struct timeval tv; |
| 206 | fd_set readfds; |
| 207 | |
| 208 | FD_ZERO (&readfds); |
| 209 | |
| 210 | tv.tv_sec = timeout; |
| 211 | tv.tv_usec = 0; |
| 212 | |
| 213 | FD_SET(scb->fd, &readfds); |
| 214 | |
| 215 | if (timeout >= 0) |
| 216 | numfds = select(scb->fd+1, &readfds, 0, 0, &tv); |
| 217 | else |
| 218 | numfds = select(scb->fd+1, &readfds, 0, 0, 0); |
| 219 | |
| 220 | if (numfds <= 0) |
| 221 | if (numfds == 0) |
| 222 | return SERIAL_TIMEOUT; |
| 223 | else |
| 224 | return SERIAL_ERROR; /* Got an error from select or poll */ |
| 225 | |
| 226 | return 0; |
| 227 | |
| 228 | #endif /* HAVE_SGTTY */ |
| 229 | |
| 230 | #if defined HAVE_TERMIO || defined HAVE_TERMIOS |
| 231 | if (timeout == scb->current_timeout) |
| 232 | return 0; |
| 233 | |
| 234 | { |
| 235 | struct hardwire_ttystate state; |
| 236 | |
| 237 | if (get_tty_state(scb, &state)) |
| 238 | fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno)); |
| 239 | |
| 240 | #ifdef HAVE_TERMIOS |
| 241 | state.termios.c_cc[VTIME] = timeout * 10; |
| 242 | #endif |
| 243 | |
| 244 | #ifdef HAVE_TERMIO |
| 245 | state.termio.c_cc[VTIME] = timeout * 10; |
| 246 | #endif |
| 247 | |
| 248 | scb->current_timeout = timeout; |
| 249 | |
| 250 | if (set_tty_state (scb, &state)) |
| 251 | fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno)); |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | #endif /* HAVE_TERMIO || HAVE_TERMIOS */ |
| 256 | } |
| 257 | |
| 258 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds |
| 259 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns |
| 260 | char if successful. Returns -2 if timeout expired, EOF if line dropped |
| 261 | dead, or -3 for any other error (see errno in that case). */ |
| 262 | |
| 263 | static int |
| 264 | hardwire_readchar(scb, timeout) |
| 265 | serial_t scb; |
| 266 | int timeout; |
| 267 | { |
| 268 | int status; |
| 269 | |
| 270 | if (scb->bufcnt-- > 0) |
| 271 | return *scb->bufp++; |
| 272 | |
| 273 | status = wait_for(scb, timeout); |
| 274 | |
| 275 | if (status < 0) |
| 276 | return status; |
| 277 | |
| 278 | scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ); |
| 279 | |
| 280 | if (scb->bufcnt <= 0) |
| 281 | if (scb->bufcnt == 0) |
| 282 | return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to |
| 283 | distinguish between EOF & timeouts |
| 284 | someday] */ |
| 285 | else |
| 286 | return SERIAL_ERROR; /* Got an error from read */ |
| 287 | |
| 288 | scb->bufcnt--; |
| 289 | scb->bufp = scb->buf; |
| 290 | return *scb->bufp++; |
| 291 | } |
| 292 | |
| 293 | #ifndef B19200 |
| 294 | #define B19200 EXTA |
| 295 | #endif |
| 296 | |
| 297 | #ifndef B38400 |
| 298 | #define B38400 EXTB |
| 299 | #endif |
| 300 | |
| 301 | /* Translate baud rates from integers to damn B_codes. Unix should |
| 302 | have outgrown this crap years ago, but even POSIX wouldn't buck it. */ |
| 303 | |
| 304 | static struct |
| 305 | { |
| 306 | int rate; |
| 307 | int code; |
| 308 | } |
| 309 | baudtab[] = |
| 310 | { |
| 311 | {50, B50}, |
| 312 | {75, B75}, |
| 313 | {110, B110}, |
| 314 | {134, B134}, |
| 315 | {150, B150}, |
| 316 | {200, B200}, |
| 317 | {300, B300}, |
| 318 | {600, B600}, |
| 319 | {1200, B1200}, |
| 320 | {1800, B1800}, |
| 321 | {2400, B2400}, |
| 322 | {4800, B4800}, |
| 323 | {9600, B9600}, |
| 324 | {19200, B19200}, |
| 325 | {38400, B38400}, |
| 326 | {-1, -1}, |
| 327 | }; |
| 328 | |
| 329 | static int |
| 330 | rate_to_code(rate) |
| 331 | int rate; |
| 332 | { |
| 333 | int i; |
| 334 | |
| 335 | for (i = 0; baudtab[i].rate != -1; i++) |
| 336 | if (rate == baudtab[i].rate) |
| 337 | return baudtab[i].code; |
| 338 | |
| 339 | return -1; |
| 340 | } |
| 341 | |
| 342 | static int |
| 343 | hardwire_setbaudrate(scb, rate) |
| 344 | serial_t scb; |
| 345 | int rate; |
| 346 | { |
| 347 | struct hardwire_ttystate state; |
| 348 | |
| 349 | if (get_tty_state(scb, &state)) |
| 350 | return -1; |
| 351 | |
| 352 | #ifdef HAVE_TERMIOS |
| 353 | cfsetospeed (&state.termios, rate_to_code (rate)); |
| 354 | cfsetispeed (&state.termios, rate_to_code (rate)); |
| 355 | #endif |
| 356 | |
| 357 | #ifdef HAVE_TERMIO |
| 358 | #ifndef CIBAUD |
| 359 | #define CIBAUD CBAUD |
| 360 | #endif |
| 361 | |
| 362 | state.termio.c_cflag &= ~(CBAUD | CIBAUD); |
| 363 | state.termio.c_cflag |= rate_to_code (rate); |
| 364 | #endif |
| 365 | |
| 366 | #ifdef HAVE_SGTTY |
| 367 | state.sgttyb.sg_ispeed = rate_to_code (rate); |
| 368 | state.sgttyb.sg_ospeed = rate_to_code (rate); |
| 369 | #endif |
| 370 | |
| 371 | return set_tty_state (scb, &state); |
| 372 | } |
| 373 | |
| 374 | static int |
| 375 | hardwire_write(scb, str, len) |
| 376 | serial_t scb; |
| 377 | const char *str; |
| 378 | int len; |
| 379 | { |
| 380 | int cc; |
| 381 | |
| 382 | while (len > 0) |
| 383 | { |
| 384 | cc = write(scb->fd, str, len); |
| 385 | |
| 386 | if (cc < 0) |
| 387 | return 1; |
| 388 | len -= cc; |
| 389 | str += cc; |
| 390 | } |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | static void |
| 395 | hardwire_close(scb) |
| 396 | serial_t scb; |
| 397 | { |
| 398 | if (scb->fd < 0) |
| 399 | return; |
| 400 | |
| 401 | close(scb->fd); |
| 402 | scb->fd = -1; |
| 403 | } |
| 404 | |
| 405 | static struct serial_ops hardwire_ops = |
| 406 | { |
| 407 | "hardwire", |
| 408 | 0, |
| 409 | hardwire_open, |
| 410 | hardwire_close, |
| 411 | hardwire_readchar, |
| 412 | hardwire_write, |
| 413 | hardwire_raw, |
| 414 | hardwire_get_tty_state, |
| 415 | hardwire_set_tty_state, |
| 416 | hardwire_setbaudrate, |
| 417 | }; |
| 418 | |
| 419 | void |
| 420 | _initialize_ser_hardwire () |
| 421 | { |
| 422 | serial_add_interface (&hardwire_ops); |
| 423 | } |