| 1 | /* Serial interface for local (hardwired) serial ports on Un*x like systems |
| 2 | Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "serial.h" |
| 24 | #include "ser-unix.h" |
| 25 | |
| 26 | #include <fcntl.h> |
| 27 | #include <sys/types.h> |
| 28 | #include "terminal.h" |
| 29 | #include <sys/socket.h> |
| 30 | #include <sys/time.h> |
| 31 | |
| 32 | #include "gdb_string.h" |
| 33 | #include "event-loop.h" |
| 34 | |
| 35 | #ifdef HAVE_TERMIOS |
| 36 | |
| 37 | struct hardwire_ttystate |
| 38 | { |
| 39 | struct termios termios; |
| 40 | }; |
| 41 | #endif /* termios */ |
| 42 | |
| 43 | #ifdef HAVE_TERMIO |
| 44 | |
| 45 | /* It is believed that all systems which have added job control to SVR3 |
| 46 | (e.g. sco) have also added termios. Even if not, trying to figure out |
| 47 | all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty |
| 48 | bewildering. So we don't attempt it. */ |
| 49 | |
| 50 | struct hardwire_ttystate |
| 51 | { |
| 52 | struct termio termio; |
| 53 | }; |
| 54 | #endif /* termio */ |
| 55 | |
| 56 | #ifdef HAVE_SGTTY |
| 57 | struct hardwire_ttystate |
| 58 | { |
| 59 | struct sgttyb sgttyb; |
| 60 | struct tchars tc; |
| 61 | struct ltchars ltc; |
| 62 | /* Line discipline flags. */ |
| 63 | int lmode; |
| 64 | }; |
| 65 | #endif /* sgtty */ |
| 66 | |
| 67 | static int hardwire_open (struct serial *scb, const char *name); |
| 68 | static void hardwire_raw (struct serial *scb); |
| 69 | static int wait_for (struct serial *scb, int timeout); |
| 70 | static int hardwire_readchar (struct serial *scb, int timeout); |
| 71 | static int do_hardwire_readchar (struct serial *scb, int timeout); |
| 72 | static int generic_readchar (struct serial *scb, int timeout, |
| 73 | int (*do_readchar) (struct serial *scb, |
| 74 | int timeout)); |
| 75 | static int rate_to_code (int rate); |
| 76 | static int hardwire_setbaudrate (struct serial *scb, int rate); |
| 77 | static void hardwire_close (struct serial *scb); |
| 78 | static int get_tty_state (struct serial *scb, |
| 79 | struct hardwire_ttystate * state); |
| 80 | static int set_tty_state (struct serial *scb, |
| 81 | struct hardwire_ttystate * state); |
| 82 | static serial_ttystate hardwire_get_tty_state (struct serial *scb); |
| 83 | static int hardwire_set_tty_state (struct serial *scb, serial_ttystate state); |
| 84 | static int hardwire_noflush_set_tty_state (struct serial *, serial_ttystate, |
| 85 | serial_ttystate); |
| 86 | static void hardwire_print_tty_state (struct serial *, serial_ttystate, |
| 87 | struct ui_file *); |
| 88 | static int hardwire_drain_output (struct serial *); |
| 89 | static int hardwire_flush_output (struct serial *); |
| 90 | static int hardwire_flush_input (struct serial *); |
| 91 | static int hardwire_send_break (struct serial *); |
| 92 | static int hardwire_setstopbits (struct serial *, int); |
| 93 | |
| 94 | static int do_unix_readchar (struct serial *scb, int timeout); |
| 95 | static timer_handler_func push_event; |
| 96 | static handler_func fd_event; |
| 97 | static void reschedule (struct serial *scb); |
| 98 | |
| 99 | void _initialize_ser_hardwire (void); |
| 100 | |
| 101 | extern int (*ui_loop_hook) (int); |
| 102 | |
| 103 | /* Open up a real live device for serial I/O */ |
| 104 | |
| 105 | static int |
| 106 | hardwire_open (struct serial *scb, const char *name) |
| 107 | { |
| 108 | scb->fd = open (name, O_RDWR); |
| 109 | if (scb->fd < 0) |
| 110 | return -1; |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static int |
| 116 | get_tty_state (struct serial *scb, struct hardwire_ttystate *state) |
| 117 | { |
| 118 | #ifdef HAVE_TERMIOS |
| 119 | if (tcgetattr (scb->fd, &state->termios) < 0) |
| 120 | return -1; |
| 121 | |
| 122 | return 0; |
| 123 | #endif |
| 124 | |
| 125 | #ifdef HAVE_TERMIO |
| 126 | if (ioctl (scb->fd, TCGETA, &state->termio) < 0) |
| 127 | return -1; |
| 128 | return 0; |
| 129 | #endif |
| 130 | |
| 131 | #ifdef HAVE_SGTTY |
| 132 | if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0) |
| 133 | return -1; |
| 134 | if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0) |
| 135 | return -1; |
| 136 | if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0) |
| 137 | return -1; |
| 138 | if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0) |
| 139 | return -1; |
| 140 | |
| 141 | return 0; |
| 142 | #endif |
| 143 | } |
| 144 | |
| 145 | static int |
| 146 | set_tty_state (struct serial *scb, struct hardwire_ttystate *state) |
| 147 | { |
| 148 | #ifdef HAVE_TERMIOS |
| 149 | if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0) |
| 150 | return -1; |
| 151 | |
| 152 | return 0; |
| 153 | #endif |
| 154 | |
| 155 | #ifdef HAVE_TERMIO |
| 156 | if (ioctl (scb->fd, TCSETA, &state->termio) < 0) |
| 157 | return -1; |
| 158 | return 0; |
| 159 | #endif |
| 160 | |
| 161 | #ifdef HAVE_SGTTY |
| 162 | if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0) |
| 163 | return -1; |
| 164 | if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0) |
| 165 | return -1; |
| 166 | if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0) |
| 167 | return -1; |
| 168 | if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0) |
| 169 | return -1; |
| 170 | |
| 171 | return 0; |
| 172 | #endif |
| 173 | } |
| 174 | |
| 175 | static serial_ttystate |
| 176 | hardwire_get_tty_state (struct serial *scb) |
| 177 | { |
| 178 | struct hardwire_ttystate *state; |
| 179 | |
| 180 | state = (struct hardwire_ttystate *) xmalloc (sizeof *state); |
| 181 | |
| 182 | if (get_tty_state (scb, state)) |
| 183 | return NULL; |
| 184 | |
| 185 | return (serial_ttystate) state; |
| 186 | } |
| 187 | |
| 188 | static int |
| 189 | hardwire_set_tty_state (struct serial *scb, serial_ttystate ttystate) |
| 190 | { |
| 191 | struct hardwire_ttystate *state; |
| 192 | |
| 193 | state = (struct hardwire_ttystate *) ttystate; |
| 194 | |
| 195 | return set_tty_state (scb, state); |
| 196 | } |
| 197 | |
| 198 | static int |
| 199 | hardwire_noflush_set_tty_state (struct serial *scb, |
| 200 | serial_ttystate new_ttystate, |
| 201 | serial_ttystate old_ttystate) |
| 202 | { |
| 203 | struct hardwire_ttystate new_state; |
| 204 | #ifdef HAVE_SGTTY |
| 205 | struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate; |
| 206 | #endif |
| 207 | |
| 208 | new_state = *(struct hardwire_ttystate *) new_ttystate; |
| 209 | |
| 210 | /* Don't change in or out of raw mode; we don't want to flush input. |
| 211 | termio and termios have no such restriction; for them flushing input |
| 212 | is separate from setting the attributes. */ |
| 213 | |
| 214 | #ifdef HAVE_SGTTY |
| 215 | if (state->sgttyb.sg_flags & RAW) |
| 216 | new_state.sgttyb.sg_flags |= RAW; |
| 217 | else |
| 218 | new_state.sgttyb.sg_flags &= ~RAW; |
| 219 | |
| 220 | /* I'm not sure whether this is necessary; the manpage just mentions |
| 221 | RAW not CBREAK. */ |
| 222 | if (state->sgttyb.sg_flags & CBREAK) |
| 223 | new_state.sgttyb.sg_flags |= CBREAK; |
| 224 | else |
| 225 | new_state.sgttyb.sg_flags &= ~CBREAK; |
| 226 | #endif |
| 227 | |
| 228 | return set_tty_state (scb, &new_state); |
| 229 | } |
| 230 | |
| 231 | static void |
| 232 | hardwire_print_tty_state (struct serial *scb, |
| 233 | serial_ttystate ttystate, |
| 234 | struct ui_file *stream) |
| 235 | { |
| 236 | struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate; |
| 237 | int i; |
| 238 | |
| 239 | #ifdef HAVE_TERMIOS |
| 240 | fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n", |
| 241 | (int) state->termios.c_iflag, |
| 242 | (int) state->termios.c_oflag); |
| 243 | fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x\n", |
| 244 | (int) state->termios.c_cflag, |
| 245 | (int) state->termios.c_lflag); |
| 246 | #if 0 |
| 247 | /* This not in POSIX, and is not really documented by those systems |
| 248 | which have it (at least not Sun). */ |
| 249 | fprintf_filtered (stream, "c_line = 0x%x.\n", state->termios.c_line); |
| 250 | #endif |
| 251 | fprintf_filtered (stream, "c_cc: "); |
| 252 | for (i = 0; i < NCCS; i += 1) |
| 253 | fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]); |
| 254 | fprintf_filtered (stream, "\n"); |
| 255 | #endif |
| 256 | |
| 257 | #ifdef HAVE_TERMIO |
| 258 | fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n", |
| 259 | state->termio.c_iflag, state->termio.c_oflag); |
| 260 | fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n", |
| 261 | state->termio.c_cflag, state->termio.c_lflag, |
| 262 | state->termio.c_line); |
| 263 | fprintf_filtered (stream, "c_cc: "); |
| 264 | for (i = 0; i < NCC; i += 1) |
| 265 | fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]); |
| 266 | fprintf_filtered (stream, "\n"); |
| 267 | #endif |
| 268 | |
| 269 | #ifdef HAVE_SGTTY |
| 270 | fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n", |
| 271 | state->sgttyb.sg_flags); |
| 272 | |
| 273 | fprintf_filtered (stream, "tchars: "); |
| 274 | for (i = 0; i < (int) sizeof (struct tchars); i++) |
| 275 | fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]); |
| 276 | fprintf_filtered (stream, "\n"); |
| 277 | |
| 278 | fprintf_filtered (stream, "ltchars: "); |
| 279 | for (i = 0; i < (int) sizeof (struct ltchars); i++) |
| 280 | fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]); |
| 281 | fprintf_filtered (stream, "\n"); |
| 282 | |
| 283 | fprintf_filtered (stream, "lmode: 0x%x\n", state->lmode); |
| 284 | #endif |
| 285 | } |
| 286 | |
| 287 | /* Wait for the output to drain away, as opposed to flushing (discarding) it */ |
| 288 | |
| 289 | static int |
| 290 | hardwire_drain_output (struct serial *scb) |
| 291 | { |
| 292 | #ifdef HAVE_TERMIOS |
| 293 | return tcdrain (scb->fd); |
| 294 | #endif |
| 295 | |
| 296 | #ifdef HAVE_TERMIO |
| 297 | return ioctl (scb->fd, TCSBRK, 1); |
| 298 | #endif |
| 299 | |
| 300 | #ifdef HAVE_SGTTY |
| 301 | /* Get the current state and then restore it using TIOCSETP, |
| 302 | which should cause the output to drain and pending input |
| 303 | to be discarded. */ |
| 304 | { |
| 305 | struct hardwire_ttystate state; |
| 306 | if (get_tty_state (scb, &state)) |
| 307 | { |
| 308 | return (-1); |
| 309 | } |
| 310 | else |
| 311 | { |
| 312 | return (ioctl (scb->fd, TIOCSETP, &state.sgttyb)); |
| 313 | } |
| 314 | } |
| 315 | #endif |
| 316 | } |
| 317 | |
| 318 | static int |
| 319 | hardwire_flush_output (struct serial *scb) |
| 320 | { |
| 321 | #ifdef HAVE_TERMIOS |
| 322 | return tcflush (scb->fd, TCOFLUSH); |
| 323 | #endif |
| 324 | |
| 325 | #ifdef HAVE_TERMIO |
| 326 | return ioctl (scb->fd, TCFLSH, 1); |
| 327 | #endif |
| 328 | |
| 329 | #ifdef HAVE_SGTTY |
| 330 | /* This flushes both input and output, but we can't do better. */ |
| 331 | return ioctl (scb->fd, TIOCFLUSH, 0); |
| 332 | #endif |
| 333 | } |
| 334 | |
| 335 | static int |
| 336 | hardwire_flush_input (struct serial *scb) |
| 337 | { |
| 338 | ser_unix_flush_input (scb); |
| 339 | |
| 340 | #ifdef HAVE_TERMIOS |
| 341 | return tcflush (scb->fd, TCIFLUSH); |
| 342 | #endif |
| 343 | |
| 344 | #ifdef HAVE_TERMIO |
| 345 | return ioctl (scb->fd, TCFLSH, 0); |
| 346 | #endif |
| 347 | |
| 348 | #ifdef HAVE_SGTTY |
| 349 | /* This flushes both input and output, but we can't do better. */ |
| 350 | return ioctl (scb->fd, TIOCFLUSH, 0); |
| 351 | #endif |
| 352 | } |
| 353 | |
| 354 | static int |
| 355 | hardwire_send_break (struct serial *scb) |
| 356 | { |
| 357 | #ifdef HAVE_TERMIOS |
| 358 | return tcsendbreak (scb->fd, 0); |
| 359 | #endif |
| 360 | |
| 361 | #ifdef HAVE_TERMIO |
| 362 | return ioctl (scb->fd, TCSBRK, 0); |
| 363 | #endif |
| 364 | |
| 365 | #ifdef HAVE_SGTTY |
| 366 | { |
| 367 | int status; |
| 368 | struct timeval timeout; |
| 369 | |
| 370 | status = ioctl (scb->fd, TIOCSBRK, 0); |
| 371 | |
| 372 | /* Can't use usleep; it doesn't exist in BSD 4.2. */ |
| 373 | /* Note that if this select() is interrupted by a signal it will not wait |
| 374 | the full length of time. I think that is OK. */ |
| 375 | timeout.tv_sec = 0; |
| 376 | timeout.tv_usec = 250000; |
| 377 | select (0, 0, 0, 0, &timeout); |
| 378 | status = ioctl (scb->fd, TIOCCBRK, 0); |
| 379 | return status; |
| 380 | } |
| 381 | #endif |
| 382 | } |
| 383 | |
| 384 | static void |
| 385 | hardwire_raw (struct serial *scb) |
| 386 | { |
| 387 | struct hardwire_ttystate state; |
| 388 | |
| 389 | if (get_tty_state (scb, &state)) |
| 390 | fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n", safe_strerror (errno)); |
| 391 | |
| 392 | #ifdef HAVE_TERMIOS |
| 393 | state.termios.c_iflag = 0; |
| 394 | state.termios.c_oflag = 0; |
| 395 | state.termios.c_lflag = 0; |
| 396 | state.termios.c_cflag &= ~(CSIZE | PARENB); |
| 397 | state.termios.c_cflag |= CLOCAL | CS8; |
| 398 | state.termios.c_cc[VMIN] = 0; |
| 399 | state.termios.c_cc[VTIME] = 0; |
| 400 | #endif |
| 401 | |
| 402 | #ifdef HAVE_TERMIO |
| 403 | state.termio.c_iflag = 0; |
| 404 | state.termio.c_oflag = 0; |
| 405 | state.termio.c_lflag = 0; |
| 406 | state.termio.c_cflag &= ~(CSIZE | PARENB); |
| 407 | state.termio.c_cflag |= CLOCAL | CS8; |
| 408 | state.termio.c_cc[VMIN] = 0; |
| 409 | state.termio.c_cc[VTIME] = 0; |
| 410 | #endif |
| 411 | |
| 412 | #ifdef HAVE_SGTTY |
| 413 | state.sgttyb.sg_flags |= RAW | ANYP; |
| 414 | state.sgttyb.sg_flags &= ~(CBREAK | ECHO); |
| 415 | #endif |
| 416 | |
| 417 | scb->current_timeout = 0; |
| 418 | |
| 419 | if (set_tty_state (scb, &state)) |
| 420 | fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno)); |
| 421 | } |
| 422 | |
| 423 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, |
| 424 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. |
| 425 | |
| 426 | For termio{s}, we actually just setup VTIME if necessary, and let the |
| 427 | timeout occur in the read() in hardwire_read(). |
| 428 | */ |
| 429 | |
| 430 | /* FIXME: cagney/1999-09-16: Don't replace this with the equivalent |
| 431 | ser_unix*() until the old TERMIOS/SGTTY/... timer code has been |
| 432 | flushed. . */ |
| 433 | |
| 434 | /* NOTE: cagney/1999-09-30: Much of the code below is dead. The only |
| 435 | possible values of the TIMEOUT parameter are ONE and ZERO. |
| 436 | Consequently all the code that tries to handle the possability of |
| 437 | an overflowed timer is unnecessary. */ |
| 438 | |
| 439 | static int |
| 440 | wait_for (struct serial *scb, int timeout) |
| 441 | { |
| 442 | #ifdef HAVE_SGTTY |
| 443 | while (1) |
| 444 | { |
| 445 | struct timeval tv; |
| 446 | fd_set readfds; |
| 447 | int numfds; |
| 448 | |
| 449 | /* NOTE: Some OS's can scramble the READFDS when the select() |
| 450 | call fails (ex the kernel with Red Hat 5.2). Initialize all |
| 451 | arguments before each call. */ |
| 452 | |
| 453 | tv.tv_sec = timeout; |
| 454 | tv.tv_usec = 0; |
| 455 | |
| 456 | FD_ZERO (&readfds); |
| 457 | FD_SET (scb->fd, &readfds); |
| 458 | |
| 459 | if (timeout >= 0) |
| 460 | numfds = select (scb->fd + 1, &readfds, 0, 0, &tv); |
| 461 | else |
| 462 | numfds = select (scb->fd + 1, &readfds, 0, 0, 0); |
| 463 | |
| 464 | if (numfds <= 0) |
| 465 | if (numfds == 0) |
| 466 | return SERIAL_TIMEOUT; |
| 467 | else if (errno == EINTR) |
| 468 | continue; |
| 469 | else |
| 470 | return SERIAL_ERROR; /* Got an error from select or poll */ |
| 471 | |
| 472 | return 0; |
| 473 | } |
| 474 | #endif /* HAVE_SGTTY */ |
| 475 | |
| 476 | #if defined HAVE_TERMIO || defined HAVE_TERMIOS |
| 477 | if (timeout == scb->current_timeout) |
| 478 | return 0; |
| 479 | |
| 480 | scb->current_timeout = timeout; |
| 481 | |
| 482 | { |
| 483 | struct hardwire_ttystate state; |
| 484 | |
| 485 | if (get_tty_state (scb, &state)) |
| 486 | fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n", safe_strerror (errno)); |
| 487 | |
| 488 | #ifdef HAVE_TERMIOS |
| 489 | if (timeout < 0) |
| 490 | { |
| 491 | /* No timeout. */ |
| 492 | state.termios.c_cc[VTIME] = 0; |
| 493 | state.termios.c_cc[VMIN] = 1; |
| 494 | } |
| 495 | else |
| 496 | { |
| 497 | state.termios.c_cc[VMIN] = 0; |
| 498 | state.termios.c_cc[VTIME] = timeout * 10; |
| 499 | if (state.termios.c_cc[VTIME] != timeout * 10) |
| 500 | { |
| 501 | |
| 502 | /* If c_cc is an 8-bit signed character, we can't go |
| 503 | bigger than this. If it is always unsigned, we could use |
| 504 | 25. */ |
| 505 | |
| 506 | scb->current_timeout = 12; |
| 507 | state.termios.c_cc[VTIME] = scb->current_timeout * 10; |
| 508 | scb->timeout_remaining = timeout - scb->current_timeout; |
| 509 | } |
| 510 | } |
| 511 | #endif |
| 512 | |
| 513 | #ifdef HAVE_TERMIO |
| 514 | if (timeout < 0) |
| 515 | { |
| 516 | /* No timeout. */ |
| 517 | state.termio.c_cc[VTIME] = 0; |
| 518 | state.termio.c_cc[VMIN] = 1; |
| 519 | } |
| 520 | else |
| 521 | { |
| 522 | state.termio.c_cc[VMIN] = 0; |
| 523 | state.termio.c_cc[VTIME] = timeout * 10; |
| 524 | if (state.termio.c_cc[VTIME] != timeout * 10) |
| 525 | { |
| 526 | /* If c_cc is an 8-bit signed character, we can't go |
| 527 | bigger than this. If it is always unsigned, we could use |
| 528 | 25. */ |
| 529 | |
| 530 | scb->current_timeout = 12; |
| 531 | state.termio.c_cc[VTIME] = scb->current_timeout * 10; |
| 532 | scb->timeout_remaining = timeout - scb->current_timeout; |
| 533 | } |
| 534 | } |
| 535 | #endif |
| 536 | |
| 537 | if (set_tty_state (scb, &state)) |
| 538 | fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno)); |
| 539 | |
| 540 | return 0; |
| 541 | } |
| 542 | #endif /* HAVE_TERMIO || HAVE_TERMIOS */ |
| 543 | } |
| 544 | |
| 545 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds |
| 546 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns |
| 547 | char if successful. Returns SERIAL_TIMEOUT if timeout expired, EOF if line |
| 548 | dropped dead, or SERIAL_ERROR for any other error (see errno in that case). */ |
| 549 | |
| 550 | /* FIXME: cagney/1999-09-16: Don't replace this with the equivalent |
| 551 | ser_unix*() until the old TERMIOS/SGTTY/... timer code has been |
| 552 | flushed. */ |
| 553 | |
| 554 | /* NOTE: cagney/1999-09-16: This function is not identical to |
| 555 | ser_unix_readchar() as part of replacing it with ser_unix*() |
| 556 | merging will be required - this code handles the case where read() |
| 557 | times out due to no data while ser_unix_readchar() doesn't expect |
| 558 | that. */ |
| 559 | |
| 560 | static int |
| 561 | do_hardwire_readchar (struct serial *scb, int timeout) |
| 562 | { |
| 563 | int status, delta; |
| 564 | int detach = 0; |
| 565 | |
| 566 | if (timeout > 0) |
| 567 | timeout++; |
| 568 | |
| 569 | /* We have to be able to keep the GUI alive here, so we break the original |
| 570 | timeout into steps of 1 second, running the "keep the GUI alive" hook |
| 571 | each time through the loop. |
| 572 | Also, timeout = 0 means to poll, so we just set the delta to 0, so we |
| 573 | will only go through the loop once. */ |
| 574 | |
| 575 | delta = (timeout == 0 ? 0 : 1); |
| 576 | while (1) |
| 577 | { |
| 578 | |
| 579 | /* N.B. The UI may destroy our world (for instance by calling |
| 580 | remote_stop,) in which case we want to get out of here as |
| 581 | quickly as possible. It is not safe to touch scb, since |
| 582 | someone else might have freed it. The ui_loop_hook signals that |
| 583 | we should exit by returning 1. */ |
| 584 | |
| 585 | if (ui_loop_hook) |
| 586 | detach = ui_loop_hook (0); |
| 587 | |
| 588 | if (detach) |
| 589 | return SERIAL_TIMEOUT; |
| 590 | |
| 591 | scb->timeout_remaining = (timeout < 0 ? timeout : timeout - delta); |
| 592 | status = wait_for (scb, delta); |
| 593 | |
| 594 | if (status < 0) |
| 595 | return status; |
| 596 | |
| 597 | status = read (scb->fd, scb->buf, BUFSIZ); |
| 598 | |
| 599 | if (status <= 0) |
| 600 | { |
| 601 | if (status == 0) |
| 602 | { |
| 603 | /* Zero characters means timeout (it could also be EOF, but |
| 604 | we don't (yet at least) distinguish). */ |
| 605 | if (scb->timeout_remaining > 0) |
| 606 | { |
| 607 | timeout = scb->timeout_remaining; |
| 608 | continue; |
| 609 | } |
| 610 | else if (scb->timeout_remaining < 0) |
| 611 | continue; |
| 612 | else |
| 613 | return SERIAL_TIMEOUT; |
| 614 | } |
| 615 | else if (errno == EINTR) |
| 616 | continue; |
| 617 | else |
| 618 | return SERIAL_ERROR; /* Got an error from read */ |
| 619 | } |
| 620 | |
| 621 | scb->bufcnt = status; |
| 622 | scb->bufcnt--; |
| 623 | scb->bufp = scb->buf; |
| 624 | return *scb->bufp++; |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | static int |
| 629 | hardwire_readchar (struct serial *scb, int timeout) |
| 630 | { |
| 631 | return generic_readchar (scb, timeout, do_hardwire_readchar); |
| 632 | } |
| 633 | |
| 634 | |
| 635 | #ifndef B19200 |
| 636 | #define B19200 EXTA |
| 637 | #endif |
| 638 | |
| 639 | #ifndef B38400 |
| 640 | #define B38400 EXTB |
| 641 | #endif |
| 642 | |
| 643 | /* Translate baud rates from integers to damn B_codes. Unix should |
| 644 | have outgrown this crap years ago, but even POSIX wouldn't buck it. */ |
| 645 | |
| 646 | static struct |
| 647 | { |
| 648 | int rate; |
| 649 | int code; |
| 650 | } |
| 651 | baudtab[] = |
| 652 | { |
| 653 | { |
| 654 | 50, B50 |
| 655 | } |
| 656 | , |
| 657 | { |
| 658 | 75, B75 |
| 659 | } |
| 660 | , |
| 661 | { |
| 662 | 110, B110 |
| 663 | } |
| 664 | , |
| 665 | { |
| 666 | 134, B134 |
| 667 | } |
| 668 | , |
| 669 | { |
| 670 | 150, B150 |
| 671 | } |
| 672 | , |
| 673 | { |
| 674 | 200, B200 |
| 675 | } |
| 676 | , |
| 677 | { |
| 678 | 300, B300 |
| 679 | } |
| 680 | , |
| 681 | { |
| 682 | 600, B600 |
| 683 | } |
| 684 | , |
| 685 | { |
| 686 | 1200, B1200 |
| 687 | } |
| 688 | , |
| 689 | { |
| 690 | 1800, B1800 |
| 691 | } |
| 692 | , |
| 693 | { |
| 694 | 2400, B2400 |
| 695 | } |
| 696 | , |
| 697 | { |
| 698 | 4800, B4800 |
| 699 | } |
| 700 | , |
| 701 | { |
| 702 | 9600, B9600 |
| 703 | } |
| 704 | , |
| 705 | { |
| 706 | 19200, B19200 |
| 707 | } |
| 708 | , |
| 709 | { |
| 710 | 38400, B38400 |
| 711 | } |
| 712 | , |
| 713 | #ifdef B57600 |
| 714 | { |
| 715 | 57600, B57600 |
| 716 | } |
| 717 | , |
| 718 | #endif |
| 719 | #ifdef B115200 |
| 720 | { |
| 721 | 115200, B115200 |
| 722 | } |
| 723 | , |
| 724 | #endif |
| 725 | #ifdef B230400 |
| 726 | { |
| 727 | 230400, B230400 |
| 728 | } |
| 729 | , |
| 730 | #endif |
| 731 | #ifdef B460800 |
| 732 | { |
| 733 | 460800, B460800 |
| 734 | } |
| 735 | , |
| 736 | #endif |
| 737 | { |
| 738 | -1, -1 |
| 739 | } |
| 740 | , |
| 741 | }; |
| 742 | |
| 743 | static int |
| 744 | rate_to_code (int rate) |
| 745 | { |
| 746 | int i; |
| 747 | |
| 748 | for (i = 0; baudtab[i].rate != -1; i++) |
| 749 | { |
| 750 | /* test for perfect macth. */ |
| 751 | if (rate == baudtab[i].rate) |
| 752 | return baudtab[i].code; |
| 753 | else |
| 754 | { |
| 755 | /* check if it is in between valid values. */ |
| 756 | if (rate < baudtab[i].rate) |
| 757 | { |
| 758 | if (i) |
| 759 | { |
| 760 | warning ("Invalid baud rate %d. Closest values are %d and %d.", |
| 761 | rate, baudtab[i - 1].rate, baudtab[i].rate); |
| 762 | } |
| 763 | else |
| 764 | { |
| 765 | warning ("Invalid baud rate %d. Minimum value is %d.", |
| 766 | rate, baudtab[0].rate); |
| 767 | } |
| 768 | return -1; |
| 769 | } |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | /* The requested speed was too large. */ |
| 774 | warning ("Invalid baud rate %d. Maximum value is %d.", |
| 775 | rate, baudtab[i - 1].rate); |
| 776 | return -1; |
| 777 | } |
| 778 | |
| 779 | static int |
| 780 | hardwire_setbaudrate (struct serial *scb, int rate) |
| 781 | { |
| 782 | struct hardwire_ttystate state; |
| 783 | int baud_code = rate_to_code (rate); |
| 784 | |
| 785 | if (baud_code < 0) |
| 786 | { |
| 787 | /* The baud rate was not valid. |
| 788 | A warning has already been issued. */ |
| 789 | errno = EINVAL; |
| 790 | return -1; |
| 791 | } |
| 792 | |
| 793 | if (get_tty_state (scb, &state)) |
| 794 | return -1; |
| 795 | |
| 796 | #ifdef HAVE_TERMIOS |
| 797 | cfsetospeed (&state.termios, baud_code); |
| 798 | cfsetispeed (&state.termios, baud_code); |
| 799 | #endif |
| 800 | |
| 801 | #ifdef HAVE_TERMIO |
| 802 | #ifndef CIBAUD |
| 803 | #define CIBAUD CBAUD |
| 804 | #endif |
| 805 | |
| 806 | state.termio.c_cflag &= ~(CBAUD | CIBAUD); |
| 807 | state.termio.c_cflag |= baud_code; |
| 808 | #endif |
| 809 | |
| 810 | #ifdef HAVE_SGTTY |
| 811 | state.sgttyb.sg_ispeed = baud_code; |
| 812 | state.sgttyb.sg_ospeed = baud_code; |
| 813 | #endif |
| 814 | |
| 815 | return set_tty_state (scb, &state); |
| 816 | } |
| 817 | |
| 818 | static int |
| 819 | hardwire_setstopbits (struct serial *scb, int num) |
| 820 | { |
| 821 | struct hardwire_ttystate state; |
| 822 | int newbit; |
| 823 | |
| 824 | if (get_tty_state (scb, &state)) |
| 825 | return -1; |
| 826 | |
| 827 | switch (num) |
| 828 | { |
| 829 | case SERIAL_1_STOPBITS: |
| 830 | newbit = 0; |
| 831 | break; |
| 832 | case SERIAL_1_AND_A_HALF_STOPBITS: |
| 833 | case SERIAL_2_STOPBITS: |
| 834 | newbit = 1; |
| 835 | break; |
| 836 | default: |
| 837 | return 1; |
| 838 | } |
| 839 | |
| 840 | #ifdef HAVE_TERMIOS |
| 841 | if (!newbit) |
| 842 | state.termios.c_cflag &= ~CSTOPB; |
| 843 | else |
| 844 | state.termios.c_cflag |= CSTOPB; /* two bits */ |
| 845 | #endif |
| 846 | |
| 847 | #ifdef HAVE_TERMIO |
| 848 | if (!newbit) |
| 849 | state.termio.c_cflag &= ~CSTOPB; |
| 850 | else |
| 851 | state.termio.c_cflag |= CSTOPB; /* two bits */ |
| 852 | #endif |
| 853 | |
| 854 | #ifdef HAVE_SGTTY |
| 855 | return 0; /* sgtty doesn't support this */ |
| 856 | #endif |
| 857 | |
| 858 | return set_tty_state (scb, &state); |
| 859 | } |
| 860 | |
| 861 | static void |
| 862 | hardwire_close (struct serial *scb) |
| 863 | { |
| 864 | if (scb->fd < 0) |
| 865 | return; |
| 866 | |
| 867 | close (scb->fd); |
| 868 | scb->fd = -1; |
| 869 | } |
| 870 | |
| 871 | \f |
| 872 | /* Generic operations used by all UNIX/FD based serial interfaces. */ |
| 873 | |
| 874 | serial_ttystate |
| 875 | ser_unix_nop_get_tty_state (struct serial *scb) |
| 876 | { |
| 877 | /* allocate a dummy */ |
| 878 | return (serial_ttystate) XMALLOC (int); |
| 879 | } |
| 880 | |
| 881 | int |
| 882 | ser_unix_nop_set_tty_state (struct serial *scb, serial_ttystate ttystate) |
| 883 | { |
| 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | void |
| 888 | ser_unix_nop_raw (struct serial *scb) |
| 889 | { |
| 890 | return; /* Always in raw mode */ |
| 891 | } |
| 892 | |
| 893 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, |
| 894 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. */ |
| 895 | |
| 896 | int |
| 897 | ser_unix_wait_for (struct serial *scb, int timeout) |
| 898 | { |
| 899 | while (1) |
| 900 | { |
| 901 | int numfds; |
| 902 | struct timeval tv; |
| 903 | fd_set readfds, exceptfds; |
| 904 | |
| 905 | /* NOTE: Some OS's can scramble the READFDS when the select() |
| 906 | call fails (ex the kernel with Red Hat 5.2). Initialize all |
| 907 | arguments before each call. */ |
| 908 | |
| 909 | tv.tv_sec = timeout; |
| 910 | tv.tv_usec = 0; |
| 911 | |
| 912 | FD_ZERO (&readfds); |
| 913 | FD_ZERO (&exceptfds); |
| 914 | FD_SET (scb->fd, &readfds); |
| 915 | FD_SET (scb->fd, &exceptfds); |
| 916 | |
| 917 | if (timeout >= 0) |
| 918 | numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv); |
| 919 | else |
| 920 | numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0); |
| 921 | |
| 922 | if (numfds <= 0) |
| 923 | { |
| 924 | if (numfds == 0) |
| 925 | return SERIAL_TIMEOUT; |
| 926 | else if (errno == EINTR) |
| 927 | continue; |
| 928 | else |
| 929 | return SERIAL_ERROR; /* Got an error from select or poll */ |
| 930 | } |
| 931 | |
| 932 | return 0; |
| 933 | } |
| 934 | } |
| 935 | |
| 936 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds |
| 937 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns |
| 938 | char if successful. Returns -2 if timeout expired, EOF if line dropped |
| 939 | dead, or -3 for any other error (see errno in that case). */ |
| 940 | |
| 941 | static int |
| 942 | do_unix_readchar (struct serial *scb, int timeout) |
| 943 | { |
| 944 | int status; |
| 945 | int delta; |
| 946 | |
| 947 | /* We have to be able to keep the GUI alive here, so we break the original |
| 948 | timeout into steps of 1 second, running the "keep the GUI alive" hook |
| 949 | each time through the loop. |
| 950 | |
| 951 | Also, timeout = 0 means to poll, so we just set the delta to 0, so we |
| 952 | will only go through the loop once. */ |
| 953 | |
| 954 | delta = (timeout == 0 ? 0 : 1); |
| 955 | while (1) |
| 956 | { |
| 957 | |
| 958 | /* N.B. The UI may destroy our world (for instance by calling |
| 959 | remote_stop,) in which case we want to get out of here as |
| 960 | quickly as possible. It is not safe to touch scb, since |
| 961 | someone else might have freed it. The ui_loop_hook signals that |
| 962 | we should exit by returning 1. */ |
| 963 | |
| 964 | if (ui_loop_hook) |
| 965 | { |
| 966 | if (ui_loop_hook (0)) |
| 967 | return SERIAL_TIMEOUT; |
| 968 | } |
| 969 | |
| 970 | status = ser_unix_wait_for (scb, delta); |
| 971 | if (timeout > 0) |
| 972 | timeout -= delta; |
| 973 | |
| 974 | /* If we got a character or an error back from wait_for, then we can |
| 975 | break from the loop before the timeout is completed. */ |
| 976 | |
| 977 | if (status != SERIAL_TIMEOUT) |
| 978 | { |
| 979 | break; |
| 980 | } |
| 981 | |
| 982 | /* If we have exhausted the original timeout, then generate |
| 983 | a SERIAL_TIMEOUT, and pass it out of the loop. */ |
| 984 | |
| 985 | else if (timeout == 0) |
| 986 | { |
| 987 | status = SERIAL_TIMEOUT; |
| 988 | break; |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | if (status < 0) |
| 993 | return status; |
| 994 | |
| 995 | while (1) |
| 996 | { |
| 997 | status = read (scb->fd, scb->buf, BUFSIZ); |
| 998 | if (status != -1 || errno != EINTR) |
| 999 | break; |
| 1000 | } |
| 1001 | |
| 1002 | if (status <= 0) |
| 1003 | { |
| 1004 | if (status == 0) |
| 1005 | return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to |
| 1006 | distinguish between EOF & timeouts |
| 1007 | someday] */ |
| 1008 | else |
| 1009 | return SERIAL_ERROR; /* Got an error from read */ |
| 1010 | } |
| 1011 | |
| 1012 | scb->bufcnt = status; |
| 1013 | scb->bufcnt--; |
| 1014 | scb->bufp = scb->buf; |
| 1015 | return *scb->bufp++; |
| 1016 | } |
| 1017 | |
| 1018 | /* Perform operations common to both old and new readchar. */ |
| 1019 | |
| 1020 | /* Return the next character from the input FIFO. If the FIFO is |
| 1021 | empty, call the SERIAL specific routine to try and read in more |
| 1022 | characters. |
| 1023 | |
| 1024 | Initially data from the input FIFO is returned (fd_event() |
| 1025 | pre-reads the input into that FIFO. Once that has been emptied, |
| 1026 | further data is obtained by polling the input FD using the device |
| 1027 | specific readchar() function. Note: reschedule() is called after |
| 1028 | every read. This is because there is no guarentee that the lower |
| 1029 | level fd_event() poll_event() code (which also calls reschedule()) |
| 1030 | will be called. */ |
| 1031 | |
| 1032 | static int |
| 1033 | generic_readchar (struct serial *scb, int timeout, |
| 1034 | int (do_readchar) (struct serial *scb, int timeout)) |
| 1035 | { |
| 1036 | int ch; |
| 1037 | if (scb->bufcnt > 0) |
| 1038 | { |
| 1039 | ch = *scb->bufp; |
| 1040 | scb->bufcnt--; |
| 1041 | scb->bufp++; |
| 1042 | } |
| 1043 | else if (scb->bufcnt < 0) |
| 1044 | { |
| 1045 | /* Some errors/eof are are sticky. */ |
| 1046 | ch = scb->bufcnt; |
| 1047 | } |
| 1048 | else |
| 1049 | { |
| 1050 | ch = do_readchar (scb, timeout); |
| 1051 | if (ch < 0) |
| 1052 | { |
| 1053 | switch ((enum serial_rc) ch) |
| 1054 | { |
| 1055 | case SERIAL_EOF: |
| 1056 | case SERIAL_ERROR: |
| 1057 | /* Make the error/eof stick. */ |
| 1058 | scb->bufcnt = ch; |
| 1059 | break; |
| 1060 | case SERIAL_TIMEOUT: |
| 1061 | scb->bufcnt = 0; |
| 1062 | break; |
| 1063 | } |
| 1064 | } |
| 1065 | } |
| 1066 | reschedule (scb); |
| 1067 | return ch; |
| 1068 | } |
| 1069 | |
| 1070 | int |
| 1071 | ser_unix_readchar (struct serial *scb, int timeout) |
| 1072 | { |
| 1073 | return generic_readchar (scb, timeout, do_unix_readchar); |
| 1074 | } |
| 1075 | |
| 1076 | int |
| 1077 | ser_unix_nop_noflush_set_tty_state (struct serial *scb, |
| 1078 | serial_ttystate new_ttystate, |
| 1079 | serial_ttystate old_ttystate) |
| 1080 | { |
| 1081 | return 0; |
| 1082 | } |
| 1083 | |
| 1084 | void |
| 1085 | ser_unix_nop_print_tty_state (struct serial *scb, |
| 1086 | serial_ttystate ttystate, |
| 1087 | struct ui_file *stream) |
| 1088 | { |
| 1089 | /* Nothing to print. */ |
| 1090 | return; |
| 1091 | } |
| 1092 | |
| 1093 | int |
| 1094 | ser_unix_nop_setbaudrate (struct serial *scb, int rate) |
| 1095 | { |
| 1096 | return 0; /* Never fails! */ |
| 1097 | } |
| 1098 | |
| 1099 | int |
| 1100 | ser_unix_nop_setstopbits (struct serial *scb, int num) |
| 1101 | { |
| 1102 | return 0; /* Never fails! */ |
| 1103 | } |
| 1104 | |
| 1105 | int |
| 1106 | ser_unix_write (struct serial *scb, const char *str, int len) |
| 1107 | { |
| 1108 | int cc; |
| 1109 | |
| 1110 | while (len > 0) |
| 1111 | { |
| 1112 | cc = write (scb->fd, str, len); |
| 1113 | |
| 1114 | if (cc < 0) |
| 1115 | return 1; |
| 1116 | len -= cc; |
| 1117 | str += cc; |
| 1118 | } |
| 1119 | return 0; |
| 1120 | } |
| 1121 | |
| 1122 | int |
| 1123 | ser_unix_nop_flush_output (struct serial *scb) |
| 1124 | { |
| 1125 | return 0; |
| 1126 | } |
| 1127 | |
| 1128 | int |
| 1129 | ser_unix_flush_input (struct serial *scb) |
| 1130 | { |
| 1131 | if (scb->bufcnt >= 0) |
| 1132 | { |
| 1133 | scb->bufcnt = 0; |
| 1134 | scb->bufp = scb->buf; |
| 1135 | return 0; |
| 1136 | } |
| 1137 | else |
| 1138 | return SERIAL_ERROR; |
| 1139 | } |
| 1140 | |
| 1141 | int |
| 1142 | ser_unix_nop_send_break (struct serial *scb) |
| 1143 | { |
| 1144 | return 0; |
| 1145 | } |
| 1146 | |
| 1147 | int |
| 1148 | ser_unix_nop_drain_output (struct serial *scb) |
| 1149 | { |
| 1150 | return 0; |
| 1151 | } |
| 1152 | |
| 1153 | |
| 1154 | \f |
| 1155 | /* Event handling for ASYNC serial code. |
| 1156 | |
| 1157 | At any time the SERIAL device either: has an empty FIFO and is |
| 1158 | waiting on a FD event; or has a non-empty FIFO/error condition and |
| 1159 | is constantly scheduling timer events. |
| 1160 | |
| 1161 | ASYNC only stops pestering its client when it is de-async'ed or it |
| 1162 | is told to go away. */ |
| 1163 | |
| 1164 | /* Value of scb->async_state: */ |
| 1165 | enum { |
| 1166 | /* >= 0 (TIMER_SCHEDULED) */ |
| 1167 | /* The ID of the currently scheduled timer event. This state is |
| 1168 | rarely encountered. Timer events are one-off so as soon as the |
| 1169 | event is delivered the state is shanged to NOTHING_SCHEDULED. */ |
| 1170 | FD_SCHEDULED = -1, |
| 1171 | /* The fd_event() handler is scheduled. It is called when ever the |
| 1172 | file descriptor becomes ready. */ |
| 1173 | NOTHING_SCHEDULED = -2 |
| 1174 | /* Either no task is scheduled (just going into ASYNC mode) or a |
| 1175 | timer event has just gone off and the current state has been |
| 1176 | forced into nothing scheduled. */ |
| 1177 | }; |
| 1178 | |
| 1179 | /* Identify and schedule the next ASYNC task based on scb->async_state |
| 1180 | and scb->buf* (the input FIFO). A state machine is used to avoid |
| 1181 | the need to make redundant calls into the event-loop - the next |
| 1182 | scheduled task is only changed when needed. */ |
| 1183 | |
| 1184 | static void |
| 1185 | reschedule (struct serial *scb) |
| 1186 | { |
| 1187 | if (serial_is_async_p (scb)) |
| 1188 | { |
| 1189 | int next_state; |
| 1190 | switch (scb->async_state) |
| 1191 | { |
| 1192 | case FD_SCHEDULED: |
| 1193 | if (scb->bufcnt == 0) |
| 1194 | next_state = FD_SCHEDULED; |
| 1195 | else |
| 1196 | { |
| 1197 | delete_file_handler (scb->fd); |
| 1198 | next_state = create_timer (0, push_event, scb); |
| 1199 | } |
| 1200 | break; |
| 1201 | case NOTHING_SCHEDULED: |
| 1202 | if (scb->bufcnt == 0) |
| 1203 | { |
| 1204 | add_file_handler (scb->fd, fd_event, scb); |
| 1205 | next_state = FD_SCHEDULED; |
| 1206 | } |
| 1207 | else |
| 1208 | { |
| 1209 | next_state = create_timer (0, push_event, scb); |
| 1210 | } |
| 1211 | break; |
| 1212 | default: /* TIMER SCHEDULED */ |
| 1213 | if (scb->bufcnt == 0) |
| 1214 | { |
| 1215 | delete_timer (scb->async_state); |
| 1216 | add_file_handler (scb->fd, fd_event, scb); |
| 1217 | next_state = FD_SCHEDULED; |
| 1218 | } |
| 1219 | else |
| 1220 | next_state = scb->async_state; |
| 1221 | break; |
| 1222 | } |
| 1223 | if (serial_debug_p (scb)) |
| 1224 | { |
| 1225 | switch (next_state) |
| 1226 | { |
| 1227 | case FD_SCHEDULED: |
| 1228 | if (scb->async_state != FD_SCHEDULED) |
| 1229 | fprintf_unfiltered (gdb_stdlog, "[fd%d->fd-scheduled]\n", |
| 1230 | scb->fd); |
| 1231 | break; |
| 1232 | default: /* TIMER SCHEDULED */ |
| 1233 | if (scb->async_state == FD_SCHEDULED) |
| 1234 | fprintf_unfiltered (gdb_stdlog, "[fd%d->timer-scheduled]\n", |
| 1235 | scb->fd); |
| 1236 | break; |
| 1237 | } |
| 1238 | } |
| 1239 | scb->async_state = next_state; |
| 1240 | } |
| 1241 | } |
| 1242 | |
| 1243 | /* FD_EVENT: This is scheduled when the input FIFO is empty (and there |
| 1244 | is no pending error). As soon as data arrives, it is read into the |
| 1245 | input FIFO and the client notified. The client should then drain |
| 1246 | the FIFO using readchar(). If the FIFO isn't immediatly emptied, |
| 1247 | push_event() is used to nag the client until it is. */ |
| 1248 | |
| 1249 | static void |
| 1250 | fd_event (int error, void *context) |
| 1251 | { |
| 1252 | struct serial *scb = context; |
| 1253 | if (error != 0) |
| 1254 | { |
| 1255 | scb->bufcnt = SERIAL_ERROR; |
| 1256 | } |
| 1257 | else if (scb->bufcnt == 0) |
| 1258 | { |
| 1259 | /* Prime the input FIFO. The readchar() function is used to |
| 1260 | pull characters out of the buffer. See also |
| 1261 | generic_readchar(). */ |
| 1262 | int nr; |
| 1263 | do |
| 1264 | { |
| 1265 | nr = read (scb->fd, scb->buf, BUFSIZ); |
| 1266 | } |
| 1267 | while (nr == -1 && errno == EINTR); |
| 1268 | if (nr == 0) |
| 1269 | { |
| 1270 | scb->bufcnt = SERIAL_EOF; |
| 1271 | } |
| 1272 | else if (nr > 0) |
| 1273 | { |
| 1274 | scb->bufcnt = nr; |
| 1275 | scb->bufp = scb->buf; |
| 1276 | } |
| 1277 | else |
| 1278 | { |
| 1279 | scb->bufcnt = SERIAL_ERROR; |
| 1280 | } |
| 1281 | } |
| 1282 | scb->async_handler (scb, scb->async_context); |
| 1283 | reschedule (scb); |
| 1284 | } |
| 1285 | |
| 1286 | /* PUSH_EVENT: The input FIFO is non-empty (or there is a pending |
| 1287 | error). Nag the client until all the data has been read. In the |
| 1288 | case of errors, the client will need to close or de-async the |
| 1289 | device before naging stops. */ |
| 1290 | |
| 1291 | static void |
| 1292 | push_event (void *context) |
| 1293 | { |
| 1294 | struct serial *scb = context; |
| 1295 | scb->async_state = NOTHING_SCHEDULED; /* Timers are one-off */ |
| 1296 | scb->async_handler (scb, scb->async_context); |
| 1297 | /* re-schedule */ |
| 1298 | reschedule (scb); |
| 1299 | } |
| 1300 | |
| 1301 | /* Put the SERIAL device into/out-of ASYNC mode. */ |
| 1302 | |
| 1303 | void |
| 1304 | ser_unix_async (struct serial *scb, |
| 1305 | int async_p) |
| 1306 | { |
| 1307 | if (async_p) |
| 1308 | { |
| 1309 | /* Force a re-schedule. */ |
| 1310 | scb->async_state = NOTHING_SCHEDULED; |
| 1311 | if (serial_debug_p (scb)) |
| 1312 | fprintf_unfiltered (gdb_stdlog, "[fd%d->asynchronous]\n", |
| 1313 | scb->fd); |
| 1314 | reschedule (scb); |
| 1315 | } |
| 1316 | else |
| 1317 | { |
| 1318 | if (serial_debug_p (scb)) |
| 1319 | fprintf_unfiltered (gdb_stdlog, "[fd%d->synchronous]\n", |
| 1320 | scb->fd); |
| 1321 | /* De-schedule whatever tasks are currently scheduled. */ |
| 1322 | switch (scb->async_state) |
| 1323 | { |
| 1324 | case FD_SCHEDULED: |
| 1325 | delete_file_handler (scb->fd); |
| 1326 | break; |
| 1327 | NOTHING_SCHEDULED: |
| 1328 | break; |
| 1329 | default: /* TIMER SCHEDULED */ |
| 1330 | delete_timer (scb->async_state); |
| 1331 | break; |
| 1332 | } |
| 1333 | } |
| 1334 | } |
| 1335 | |
| 1336 | void |
| 1337 | _initialize_ser_hardwire (void) |
| 1338 | { |
| 1339 | struct serial_ops *ops = XMALLOC (struct serial_ops); |
| 1340 | memset (ops, sizeof (struct serial_ops), 0); |
| 1341 | ops->name = "hardwire"; |
| 1342 | ops->next = 0; |
| 1343 | ops->open = hardwire_open; |
| 1344 | ops->close = hardwire_close; |
| 1345 | /* FIXME: Don't replace this with the equivalent ser_unix*() until |
| 1346 | the old TERMIOS/SGTTY/... timer code has been flushed. cagney |
| 1347 | 1999-09-16. */ |
| 1348 | ops->readchar = hardwire_readchar; |
| 1349 | ops->write = ser_unix_write; |
| 1350 | ops->flush_output = hardwire_flush_output; |
| 1351 | ops->flush_input = hardwire_flush_input; |
| 1352 | ops->send_break = hardwire_send_break; |
| 1353 | ops->go_raw = hardwire_raw; |
| 1354 | ops->get_tty_state = hardwire_get_tty_state; |
| 1355 | ops->set_tty_state = hardwire_set_tty_state; |
| 1356 | ops->print_tty_state = hardwire_print_tty_state; |
| 1357 | ops->noflush_set_tty_state = hardwire_noflush_set_tty_state; |
| 1358 | ops->setbaudrate = hardwire_setbaudrate; |
| 1359 | ops->setstopbits = hardwire_setstopbits; |
| 1360 | ops->drain_output = hardwire_drain_output; |
| 1361 | ops->async = ser_unix_async; |
| 1362 | serial_add_interface (ops); |
| 1363 | } |