| 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 | |
| 25 | #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY) |
| 26 | #define HAVE_SGTTY |
| 27 | #endif |
| 28 | |
| 29 | #ifdef HAVE_TERMIOS |
| 30 | #include <termios.h> |
| 31 | #include <unistd.h> |
| 32 | |
| 33 | struct hardwire_ttystate |
| 34 | { |
| 35 | struct termios termios; |
| 36 | pid_t process_group; |
| 37 | }; |
| 38 | #endif |
| 39 | |
| 40 | #ifdef HAVE_TERMIO |
| 41 | #include <termio.h> |
| 42 | |
| 43 | struct hardwire_ttystate |
| 44 | { |
| 45 | struct termio termio; |
| 46 | int process_group; |
| 47 | }; |
| 48 | #endif |
| 49 | |
| 50 | #ifdef HAVE_SGTTY |
| 51 | /* Needed for the code which uses select(). We would include <sys/select.h> |
| 52 | too if it existed on all systems. */ |
| 53 | #include <sys/time.h> |
| 54 | |
| 55 | #include <sgtty.h> |
| 56 | |
| 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 | #ifdef SHORT_PGRP |
| 66 | /* This is only used for the ultra. Does it have pid_t? */ |
| 67 | short process_group; |
| 68 | #else |
| 69 | int process_group; |
| 70 | #endif |
| 71 | }; |
| 72 | #endif |
| 73 | |
| 74 | static int hardwire_open PARAMS ((serial_t scb, const char *name)); |
| 75 | static void hardwire_raw PARAMS ((serial_t scb)); |
| 76 | static int wait_for PARAMS ((serial_t scb, int timeout)); |
| 77 | static int hardwire_readchar PARAMS ((serial_t scb, int timeout)); |
| 78 | static int rate_to_code PARAMS ((int rate)); |
| 79 | static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate)); |
| 80 | static int hardwire_write PARAMS ((serial_t scb, const char *str, int len)); |
| 81 | static void hardwire_restore PARAMS ((serial_t scb)); |
| 82 | static void hardwire_close PARAMS ((serial_t scb)); |
| 83 | static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state)); |
| 84 | static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state)); |
| 85 | static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb)); |
| 86 | static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state)); |
| 87 | |
| 88 | /* Open up a real live device for serial I/O */ |
| 89 | |
| 90 | static int |
| 91 | hardwire_open(scb, name) |
| 92 | serial_t scb; |
| 93 | const char *name; |
| 94 | { |
| 95 | scb->fd = open (name, O_RDWR); |
| 96 | if (scb->fd < 0) |
| 97 | return -1; |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static int |
| 103 | get_tty_state(scb, state) |
| 104 | serial_t scb; |
| 105 | struct hardwire_ttystate *state; |
| 106 | { |
| 107 | #ifdef HAVE_TERMIOS |
| 108 | pid_t new_process_group; |
| 109 | |
| 110 | if (tcgetattr(scb->fd, &state->termios) < 0) |
| 111 | return -1; |
| 112 | |
| 113 | if (!job_control) |
| 114 | return 0; |
| 115 | |
| 116 | new_process_group = tcgetpgrp (scb->fd); |
| 117 | if (new_process_group == (pid_t)-1) |
| 118 | return -1; |
| 119 | state->process_group = new_process_group; |
| 120 | return 0; |
| 121 | #endif |
| 122 | |
| 123 | #ifdef HAVE_TERMIO |
| 124 | if (ioctl (scb->fd, TCGETA, &state->termio) < 0) |
| 125 | return -1; |
| 126 | |
| 127 | if (!job_control) |
| 128 | return 0; |
| 129 | |
| 130 | return ioctl (scb->fd, TIOCGPGRP, &state->process_group); |
| 131 | #endif |
| 132 | |
| 133 | #ifdef HAVE_SGTTY |
| 134 | if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0) |
| 135 | return -1; |
| 136 | if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0) |
| 137 | return -1; |
| 138 | if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0) |
| 139 | return -1; |
| 140 | if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0) |
| 141 | return -1; |
| 142 | |
| 143 | if (!job_control) |
| 144 | return 0; |
| 145 | |
| 146 | return ioctl (scb->fd, TIOCGPGRP, &state->process_group); |
| 147 | #endif |
| 148 | } |
| 149 | |
| 150 | static int |
| 151 | set_tty_state(scb, state) |
| 152 | serial_t scb; |
| 153 | struct hardwire_ttystate *state; |
| 154 | { |
| 155 | #ifdef HAVE_TERMIOS |
| 156 | if (tcsetattr(scb->fd, TCSANOW, &state->termios) < 0) |
| 157 | return -1; |
| 158 | |
| 159 | if (!job_control) |
| 160 | return 0; |
| 161 | |
| 162 | /* Need to ignore errors, at least if attach_flag is set. */ |
| 163 | tcsetpgrp (scb->fd, state->process_group); |
| 164 | return 0; |
| 165 | #endif |
| 166 | |
| 167 | #ifdef HAVE_TERMIO |
| 168 | if (ioctl (scb->fd, TCSETA, &state->termio) < 0) |
| 169 | return -1; |
| 170 | |
| 171 | if (!job_control) |
| 172 | return 0; |
| 173 | |
| 174 | /* Need to ignore errors, at least if attach_flag is set. */ |
| 175 | ioctl (scb->fd, TIOCSPGRP, &state->process_group); |
| 176 | return 0; |
| 177 | #endif |
| 178 | |
| 179 | #ifdef HAVE_SGTTY |
| 180 | if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0) |
| 181 | return -1; |
| 182 | |
| 183 | if (!job_control) |
| 184 | return 0; |
| 185 | |
| 186 | /* Need to ignore errors, at least if attach_flag is set. */ |
| 187 | ioctl (scb->fd, TIOCSPGRP, &state->process_group); |
| 188 | return 0; |
| 189 | #endif |
| 190 | } |
| 191 | |
| 192 | static serial_ttystate |
| 193 | hardwire_get_tty_state(scb) |
| 194 | serial_t scb; |
| 195 | { |
| 196 | struct hardwire_ttystate *state; |
| 197 | |
| 198 | state = (struct hardwire_ttystate *)xmalloc(sizeof *state); |
| 199 | |
| 200 | if (get_tty_state(scb, state)) |
| 201 | return NULL; |
| 202 | |
| 203 | return (serial_ttystate)state; |
| 204 | } |
| 205 | |
| 206 | static int |
| 207 | hardwire_set_tty_state(scb, ttystate) |
| 208 | serial_t scb; |
| 209 | serial_ttystate ttystate; |
| 210 | { |
| 211 | struct hardwire_ttystate *state; |
| 212 | |
| 213 | state = (struct hardwire_ttystate *)ttystate; |
| 214 | |
| 215 | return set_tty_state(scb, state); |
| 216 | } |
| 217 | |
| 218 | static int |
| 219 | hardwire_noflush_set_tty_state (scb, new_ttystate, old_ttystate) |
| 220 | serial_t scb; |
| 221 | serial_ttystate new_ttystate; |
| 222 | serial_ttystate old_ttystate; |
| 223 | { |
| 224 | struct hardwire_ttystate new_state; |
| 225 | struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate; |
| 226 | |
| 227 | new_state = *(struct hardwire_ttystate *)new_ttystate; |
| 228 | |
| 229 | #ifdef HAVE_TERMIOS |
| 230 | /* I'm not sure whether this is necessary; the manpage makes no mention |
| 231 | of discarding input when switching to/from ICANON. */ |
| 232 | if (state->termios.c_lflag & ICANON) |
| 233 | new_state.termios.c_lflag |= ICANON; |
| 234 | else |
| 235 | new_state.termios.c_lflag &= ~ICANON; |
| 236 | #endif |
| 237 | |
| 238 | #ifdef HAVE_TERMIO |
| 239 | /* I'm not sure whether this is necessary; the manpage makes no mention |
| 240 | of discarding input when switching to/from ICANON. */ |
| 241 | if (state->termio.c_lflag & ICANON) |
| 242 | new_state.termio.c_lflag |= ICANON; |
| 243 | else |
| 244 | new_state.termio.c_lflag &= ~ICANON; |
| 245 | #endif |
| 246 | |
| 247 | #ifdef HAVE_SGTTY |
| 248 | if (state->sgttyb.sg_flags & RAW) |
| 249 | new_state.sgttyb.sg_flags |= RAW; |
| 250 | else |
| 251 | new_state.sgttyb.sg_flags &= ~RAW; |
| 252 | |
| 253 | /* I'm not sure whether this is necessary; the manpage just mentions |
| 254 | RAW not CBREAK. */ |
| 255 | if (state->sgttyb.sg_flags & CBREAK) |
| 256 | new_state.sgttyb.sg_flags |= CBREAK; |
| 257 | else |
| 258 | new_state.sgttyb.sg_flags &= ~CBREAK; |
| 259 | #endif |
| 260 | |
| 261 | return set_tty_state (scb, &new_state); |
| 262 | } |
| 263 | |
| 264 | static void |
| 265 | hardwire_print_tty_state (scb, ttystate) |
| 266 | serial_t scb; |
| 267 | serial_ttystate ttystate; |
| 268 | { |
| 269 | struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate; |
| 270 | int i; |
| 271 | |
| 272 | printf_filtered ("Process group = %d\n", state->process_group); |
| 273 | |
| 274 | #ifdef HAVE_TERMIOS |
| 275 | printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n", |
| 276 | state->termios.c_iflag, state->termios.c_oflag); |
| 277 | printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x\n", |
| 278 | state->termios.c_cflag, state->termios.c_lflag); |
| 279 | #if 0 |
| 280 | /* This not in POSIX, and is not really documented by those systems |
| 281 | which have it (at least not Sun). */ |
| 282 | printf_filtered ("c_line = 0x%x.\n", state->termios.c_line); |
| 283 | #endif |
| 284 | printf_filtered ("c_cc: "); |
| 285 | for (i = 0; i < NCCS; i += 1) |
| 286 | printf_filtered ("0x%x ", state->termios.c_cc[i]); |
| 287 | printf_filtered ("\n"); |
| 288 | #endif |
| 289 | |
| 290 | #ifdef HAVE_TERMIO |
| 291 | printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n", |
| 292 | state->termio.c_iflag, state->termio.c_oflag); |
| 293 | printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n", |
| 294 | state->termio.c_cflag, state->termio.c_lflag, |
| 295 | state->termio.c_line); |
| 296 | printf_filtered ("c_cc: "); |
| 297 | for (i = 0; i < NCC; i += 1) |
| 298 | printf_filtered ("0x%x ", state->termio.c_cc[i]); |
| 299 | printf_filtered ("\n"); |
| 300 | #endif |
| 301 | |
| 302 | #ifdef HAVE_SGTTY |
| 303 | printf_filtered ("sgttyb.sg_flags = 0x%x.\n", state->sgttyb.sg_flags); |
| 304 | |
| 305 | printf_filtered ("tchars: "); |
| 306 | for (i = 0; i < (int)sizeof (struct tchars); i++) |
| 307 | printf_filtered ("0x%x ", ((unsigned char *)&state->tc)[i]); |
| 308 | printf_filtered ("\n"); |
| 309 | |
| 310 | printf_filtered ("ltchars: "); |
| 311 | for (i = 0; i < (int)sizeof (struct ltchars); i++) |
| 312 | printf_filtered ("0x%x ", ((unsigned char *)&state->ltc)[i]); |
| 313 | printf_filtered ("\n"); |
| 314 | |
| 315 | printf_filtered ("lmode: 0x%x\n", state->lmode); |
| 316 | #endif |
| 317 | } |
| 318 | |
| 319 | static int |
| 320 | hardwire_flush_output (scb) |
| 321 | serial_t scb; |
| 322 | { |
| 323 | #ifdef HAVE_TERMIOS |
| 324 | return tcflush (scb->fd, TCOFLUSH); |
| 325 | #endif |
| 326 | |
| 327 | #ifdef HAVE_TERMIO |
| 328 | return ioctl (scb->fd, TCFLSH, 1); |
| 329 | #endif |
| 330 | |
| 331 | #ifdef HAVE_SGTTY |
| 332 | /* This flushes both input and output, but we can't do better. */ |
| 333 | return ioctl (scb->fd, TIOCFLUSH, 0); |
| 334 | #endif |
| 335 | } |
| 336 | |
| 337 | static void |
| 338 | hardwire_raw(scb) |
| 339 | serial_t scb; |
| 340 | { |
| 341 | struct hardwire_ttystate state; |
| 342 | |
| 343 | if (get_tty_state(scb, &state)) |
| 344 | fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno)); |
| 345 | |
| 346 | #ifdef HAVE_TERMIOS |
| 347 | state.termios.c_iflag = 0; |
| 348 | state.termios.c_oflag = 0; |
| 349 | state.termios.c_lflag = 0; |
| 350 | state.termios.c_cflag &= ~(CSIZE|PARENB); |
| 351 | state.termios.c_cflag |= CS8; |
| 352 | state.termios.c_cc[VMIN] = 0; |
| 353 | state.termios.c_cc[VTIME] = 0; |
| 354 | #endif |
| 355 | |
| 356 | #ifdef HAVE_TERMIO |
| 357 | state.termio.c_iflag = 0; |
| 358 | state.termio.c_oflag = 0; |
| 359 | state.termio.c_lflag = 0; |
| 360 | state.termio.c_cflag &= ~(CSIZE|PARENB); |
| 361 | state.termio.c_cflag |= CS8; |
| 362 | state.termio.c_cc[VMIN] = 0; |
| 363 | state.termio.c_cc[VTIME] = 0; |
| 364 | #endif |
| 365 | |
| 366 | #ifdef HAVE_SGTTY |
| 367 | state.sgttyb.sg_flags |= RAW | ANYP; |
| 368 | state.sgttyb.sg_flags &= ~(CBREAK | ECHO); |
| 369 | #endif |
| 370 | |
| 371 | scb->current_timeout = 0; |
| 372 | |
| 373 | if (set_tty_state (scb, &state)) |
| 374 | fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno)); |
| 375 | } |
| 376 | |
| 377 | /* Wait for input on scb, with timeout seconds. Returns 0 on success, |
| 378 | otherwise SERIAL_TIMEOUT or SERIAL_ERROR. |
| 379 | |
| 380 | For termio{s}, we actually just setup VTIME if necessary, and let the |
| 381 | timeout occur in the read() in hardwire_read(). |
| 382 | */ |
| 383 | |
| 384 | static int |
| 385 | wait_for(scb, timeout) |
| 386 | serial_t scb; |
| 387 | int timeout; |
| 388 | { |
| 389 | int numfds; |
| 390 | |
| 391 | #ifdef HAVE_SGTTY |
| 392 | struct timeval tv; |
| 393 | fd_set readfds; |
| 394 | |
| 395 | FD_ZERO (&readfds); |
| 396 | |
| 397 | tv.tv_sec = timeout; |
| 398 | tv.tv_usec = 0; |
| 399 | |
| 400 | FD_SET(scb->fd, &readfds); |
| 401 | |
| 402 | while (1) |
| 403 | { |
| 404 | if (timeout >= 0) |
| 405 | numfds = select(scb->fd+1, &readfds, 0, 0, &tv); |
| 406 | else |
| 407 | numfds = select(scb->fd+1, &readfds, 0, 0, 0); |
| 408 | |
| 409 | if (numfds <= 0) |
| 410 | if (numfds == 0) |
| 411 | return SERIAL_TIMEOUT; |
| 412 | else if (errno == EINTR) |
| 413 | continue; |
| 414 | else |
| 415 | return SERIAL_ERROR; /* Got an error from select or poll */ |
| 416 | |
| 417 | return 0; |
| 418 | } |
| 419 | |
| 420 | #endif /* HAVE_SGTTY */ |
| 421 | |
| 422 | #if defined HAVE_TERMIO || defined HAVE_TERMIOS |
| 423 | if (timeout == scb->current_timeout) |
| 424 | return 0; |
| 425 | |
| 426 | { |
| 427 | struct hardwire_ttystate state; |
| 428 | |
| 429 | if (get_tty_state(scb, &state)) |
| 430 | fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno)); |
| 431 | |
| 432 | #ifdef HAVE_TERMIOS |
| 433 | state.termios.c_cc[VTIME] = timeout * 10; |
| 434 | #endif |
| 435 | |
| 436 | #ifdef HAVE_TERMIO |
| 437 | state.termio.c_cc[VTIME] = timeout * 10; |
| 438 | #endif |
| 439 | |
| 440 | scb->current_timeout = timeout; |
| 441 | |
| 442 | if (set_tty_state (scb, &state)) |
| 443 | fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno)); |
| 444 | |
| 445 | return 0; |
| 446 | } |
| 447 | #endif /* HAVE_TERMIO || HAVE_TERMIOS */ |
| 448 | } |
| 449 | |
| 450 | /* Read a character with user-specified timeout. TIMEOUT is number of seconds |
| 451 | to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns |
| 452 | char if successful. Returns -2 if timeout expired, EOF if line dropped |
| 453 | dead, or -3 for any other error (see errno in that case). */ |
| 454 | |
| 455 | static int |
| 456 | hardwire_readchar(scb, timeout) |
| 457 | serial_t scb; |
| 458 | int timeout; |
| 459 | { |
| 460 | int status; |
| 461 | |
| 462 | if (scb->bufcnt-- > 0) |
| 463 | return *scb->bufp++; |
| 464 | |
| 465 | status = wait_for(scb, timeout); |
| 466 | |
| 467 | if (status < 0) |
| 468 | return status; |
| 469 | |
| 470 | scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ); |
| 471 | |
| 472 | if (scb->bufcnt <= 0) |
| 473 | if (scb->bufcnt == 0) |
| 474 | return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to |
| 475 | distinguish between EOF & timeouts |
| 476 | someday] */ |
| 477 | else |
| 478 | return SERIAL_ERROR; /* Got an error from read */ |
| 479 | |
| 480 | scb->bufcnt--; |
| 481 | scb->bufp = scb->buf; |
| 482 | return *scb->bufp++; |
| 483 | } |
| 484 | |
| 485 | #ifndef B19200 |
| 486 | #define B19200 EXTA |
| 487 | #endif |
| 488 | |
| 489 | #ifndef B38400 |
| 490 | #define B38400 EXTB |
| 491 | #endif |
| 492 | |
| 493 | /* Translate baud rates from integers to damn B_codes. Unix should |
| 494 | have outgrown this crap years ago, but even POSIX wouldn't buck it. */ |
| 495 | |
| 496 | static struct |
| 497 | { |
| 498 | int rate; |
| 499 | int code; |
| 500 | } |
| 501 | baudtab[] = |
| 502 | { |
| 503 | {50, B50}, |
| 504 | {75, B75}, |
| 505 | {110, B110}, |
| 506 | {134, B134}, |
| 507 | {150, B150}, |
| 508 | {200, B200}, |
| 509 | {300, B300}, |
| 510 | {600, B600}, |
| 511 | {1200, B1200}, |
| 512 | {1800, B1800}, |
| 513 | {2400, B2400}, |
| 514 | {4800, B4800}, |
| 515 | {9600, B9600}, |
| 516 | {19200, B19200}, |
| 517 | {38400, B38400}, |
| 518 | {-1, -1}, |
| 519 | }; |
| 520 | |
| 521 | static int |
| 522 | rate_to_code(rate) |
| 523 | int rate; |
| 524 | { |
| 525 | int i; |
| 526 | |
| 527 | for (i = 0; baudtab[i].rate != -1; i++) |
| 528 | if (rate == baudtab[i].rate) |
| 529 | return baudtab[i].code; |
| 530 | |
| 531 | return -1; |
| 532 | } |
| 533 | |
| 534 | static int |
| 535 | hardwire_setbaudrate(scb, rate) |
| 536 | serial_t scb; |
| 537 | int rate; |
| 538 | { |
| 539 | struct hardwire_ttystate state; |
| 540 | |
| 541 | if (get_tty_state(scb, &state)) |
| 542 | return -1; |
| 543 | |
| 544 | #ifdef HAVE_TERMIOS |
| 545 | cfsetospeed (&state.termios, rate_to_code (rate)); |
| 546 | cfsetispeed (&state.termios, rate_to_code (rate)); |
| 547 | #endif |
| 548 | |
| 549 | #ifdef HAVE_TERMIO |
| 550 | #ifndef CIBAUD |
| 551 | #define CIBAUD CBAUD |
| 552 | #endif |
| 553 | |
| 554 | state.termio.c_cflag &= ~(CBAUD | CIBAUD); |
| 555 | state.termio.c_cflag |= rate_to_code (rate); |
| 556 | #endif |
| 557 | |
| 558 | #ifdef HAVE_SGTTY |
| 559 | state.sgttyb.sg_ispeed = rate_to_code (rate); |
| 560 | state.sgttyb.sg_ospeed = rate_to_code (rate); |
| 561 | #endif |
| 562 | |
| 563 | return set_tty_state (scb, &state); |
| 564 | } |
| 565 | |
| 566 | static int |
| 567 | hardwire_set_process_group (scb, ttystate, group) |
| 568 | serial_t scb; |
| 569 | serial_ttystate ttystate; |
| 570 | int group; |
| 571 | { |
| 572 | ((struct hardwire_ttystate *)ttystate)->process_group = group; |
| 573 | return 0; |
| 574 | } |
| 575 | |
| 576 | static int |
| 577 | hardwire_write(scb, str, len) |
| 578 | serial_t scb; |
| 579 | const char *str; |
| 580 | int len; |
| 581 | { |
| 582 | int cc; |
| 583 | |
| 584 | while (len > 0) |
| 585 | { |
| 586 | cc = write(scb->fd, str, len); |
| 587 | |
| 588 | if (cc < 0) |
| 589 | return 1; |
| 590 | len -= cc; |
| 591 | str += cc; |
| 592 | } |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | static void |
| 597 | hardwire_close(scb) |
| 598 | serial_t scb; |
| 599 | { |
| 600 | if (scb->fd < 0) |
| 601 | return; |
| 602 | |
| 603 | close(scb->fd); |
| 604 | scb->fd = -1; |
| 605 | } |
| 606 | |
| 607 | static struct serial_ops hardwire_ops = |
| 608 | { |
| 609 | "hardwire", |
| 610 | 0, |
| 611 | hardwire_open, |
| 612 | hardwire_close, |
| 613 | hardwire_readchar, |
| 614 | hardwire_write, |
| 615 | hardwire_flush_output, |
| 616 | hardwire_raw, |
| 617 | hardwire_get_tty_state, |
| 618 | hardwire_set_tty_state, |
| 619 | hardwire_print_tty_state, |
| 620 | hardwire_noflush_set_tty_state, |
| 621 | hardwire_setbaudrate, |
| 622 | hardwire_set_process_group |
| 623 | }; |
| 624 | |
| 625 | int job_control; |
| 626 | #if defined (HAVE_TERMIOS) |
| 627 | #include <unistd.h> |
| 628 | #endif |
| 629 | |
| 630 | /* This is here because this is where we figure out whether we (probably) |
| 631 | have job control. Just using job_control only does part of it because |
| 632 | setpgid or setpgrp might not exist on a system without job control. |
| 633 | It might be considered misplaced (on the other hand, process groups and |
| 634 | job control are closely related to ttys). |
| 635 | |
| 636 | For a more clean implementation, in libiberty, put a setpgid which merely |
| 637 | calls setpgrp and a setpgrp which does nothing (any system with job control |
| 638 | will have one or the other). */ |
| 639 | int |
| 640 | gdb_setpgid () |
| 641 | { |
| 642 | int retval = 0; |
| 643 | if (job_control) |
| 644 | { |
| 645 | #if defined (NEED_POSIX_SETPGID) || defined (HAVE_TERMIOS) |
| 646 | /* Do all systems with termios have setpgid? I hope so. */ |
| 647 | retval = setpgid (0, 0); |
| 648 | #else |
| 649 | #if defined (TIOCGPGRP) |
| 650 | #if defined(USG) && !defined(SETPGRP_ARGS) |
| 651 | retval = setpgrp (); |
| 652 | #else |
| 653 | retval = setpgrp (getpid (), getpid ()); |
| 654 | #endif /* USG */ |
| 655 | #endif /* TIOCGPGRP. */ |
| 656 | #endif /* NEED_POSIX_SETPGID */ |
| 657 | } |
| 658 | return retval; |
| 659 | } |
| 660 | |
| 661 | void |
| 662 | _initialize_ser_hardwire () |
| 663 | { |
| 664 | serial_add_interface (&hardwire_ops); |
| 665 | |
| 666 | /* OK, figure out whether we have job control. */ |
| 667 | |
| 668 | #if defined (HAVE_TERMIOS) |
| 669 | /* Do all systems with termios have the POSIX way of identifying job |
| 670 | control? I hope so. */ |
| 671 | #ifdef _POSIX_JOB_CONTROL |
| 672 | /* AIX defines _POSIX_JOB_CONTROL to an empty string, so I guess |
| 673 | defining _POSIX_JOB_CONTROL to 0 to mean no job control doesn't work |
| 674 | (I don't have the standard handy). */ |
| 675 | job_control = 1; |
| 676 | #else |
| 677 | job_control = sysconf (_SC_JOB_CONTROL); |
| 678 | #endif |
| 679 | |
| 680 | #else /* not termios. */ |
| 681 | |
| 682 | #ifdef TIOCGPGRP |
| 683 | job_control = 1; |
| 684 | #else |
| 685 | job_control = 0; |
| 686 | #endif /* TIOCGPGRP */ |
| 687 | |
| 688 | #endif /* not termios. */ |
| 689 | } |