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