1 /* Serial interface for local (hardwired) serial ports on Un*x like systems
2 Copyright 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
23 #include <sys/types.h>
25 #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
33 struct hardwire_ttystate
35 struct termios termios;
43 /* It is believed that all systems which have added job control to SVR3
44 (e.g. sco) have also added termios. Even if not, trying to figure out
45 all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
46 bewildering. So we don't attempt it. */
48 struct hardwire_ttystate
55 /* Needed for the code which uses select(). We would include <sys/select.h>
56 too if it existed on all systems. */
61 struct hardwire_ttystate
66 /* Line discipline flags. */
70 /* This is only used for the ultra. Does it have pid_t? */
78 static int hardwire_open PARAMS ((serial_t scb, const char *name));
79 static void hardwire_raw PARAMS ((serial_t scb));
80 static int wait_for PARAMS ((serial_t scb, int timeout));
81 static int hardwire_readchar PARAMS ((serial_t scb, int timeout));
82 static int rate_to_code PARAMS ((int rate));
83 static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate));
84 static int hardwire_write PARAMS ((serial_t scb, const char *str, int len));
85 static void hardwire_restore PARAMS ((serial_t scb));
86 static void hardwire_close PARAMS ((serial_t scb));
87 static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
88 static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
89 static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb));
90 static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
92 /* Open up a real live device for serial I/O */
95 hardwire_open(scb, name)
99 scb->fd = open (name, O_RDWR);
107 get_tty_state(scb, state)
109 struct hardwire_ttystate *state;
112 pid_t new_process_group;
114 if (tcgetattr(scb->fd, &state->termios) < 0)
120 new_process_group = tcgetpgrp (scb->fd);
121 if (new_process_group == (pid_t)-1)
123 state->process_group = new_process_group;
128 if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
134 if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
136 if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
138 if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
140 if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
146 return ioctl (scb->fd, TIOCGPGRP, &state->process_group);
151 set_tty_state(scb, state)
153 struct hardwire_ttystate *state;
156 if (tcsetattr(scb->fd, TCSANOW, &state->termios) < 0)
162 return tcsetpgrp (scb->fd, state->process_group);
166 if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
172 if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
178 return ioctl (scb->fd, TIOCSPGRP, &state->process_group);
182 static serial_ttystate
183 hardwire_get_tty_state(scb)
186 struct hardwire_ttystate *state;
188 state = (struct hardwire_ttystate *)xmalloc(sizeof *state);
190 if (get_tty_state(scb, state))
193 return (serial_ttystate)state;
197 hardwire_set_tty_state(scb, ttystate)
199 serial_ttystate ttystate;
201 struct hardwire_ttystate *state;
203 state = (struct hardwire_ttystate *)ttystate;
205 return set_tty_state(scb, state);
209 hardwire_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
211 serial_ttystate new_ttystate;
212 serial_ttystate old_ttystate;
214 struct hardwire_ttystate new_state;
215 struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
217 new_state = *(struct hardwire_ttystate *)new_ttystate;
220 /* I'm not sure whether this is necessary; the manpage makes no mention
221 of discarding input when switching to/from ICANON. */
222 if (state->termios.c_lflag & ICANON)
223 new_state.termios.c_lflag |= ICANON;
225 new_state.termios.c_lflag &= ~ICANON;
229 /* I'm not sure whether this is necessary; the manpage makes no mention
230 of discarding input when switching to/from ICANON. */
231 if (state->termio.c_lflag & ICANON)
232 new_state.termio.c_lflag |= ICANON;
234 new_state.termio.c_lflag &= ~ICANON;
238 if (state->sgttyb.sg_flags & RAW)
239 new_state.sgttyb.sg_flags |= RAW;
241 new_state.sgttyb.sg_flags &= ~RAW;
243 /* I'm not sure whether this is necessary; the manpage just mentions
245 if (state->sgttyb.sg_flags & CBREAK)
246 new_state.sgttyb.sg_flags |= CBREAK;
248 new_state.sgttyb.sg_flags &= ~CBREAK;
251 return set_tty_state (scb, &new_state);
255 hardwire_print_tty_state (scb, ttystate)
257 serial_ttystate ttystate;
259 struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
263 printf_filtered ("Process group = %d\n", state->process_group);
265 printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
266 state->termios.c_iflag, state->termios.c_oflag);
267 printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x\n",
268 state->termios.c_cflag, state->termios.c_lflag);
270 /* This not in POSIX, and is not really documented by those systems
271 which have it (at least not Sun). */
272 printf_filtered ("c_line = 0x%x.\n", state->termios.c_line);
274 printf_filtered ("c_cc: ");
275 for (i = 0; i < NCCS; i += 1)
276 printf_filtered ("0x%x ", state->termios.c_cc[i]);
277 printf_filtered ("\n");
281 printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
282 state->termio.c_iflag, state->termio.c_oflag);
283 printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
284 state->termio.c_cflag, state->termio.c_lflag,
285 state->termio.c_line);
286 printf_filtered ("c_cc: ");
287 for (i = 0; i < NCC; i += 1)
288 printf_filtered ("0x%x ", state->termio.c_cc[i]);
289 printf_filtered ("\n");
293 printf_filtered ("Process group = %d\n", state->process_group);
295 printf_filtered ("sgttyb.sg_flags = 0x%x.\n", state->sgttyb.sg_flags);
297 printf_filtered ("tchars: ");
298 for (i = 0; i < (int)sizeof (struct tchars); i++)
299 printf_filtered ("0x%x ", ((unsigned char *)&state->tc)[i]);
300 printf_filtered ("\n");
302 printf_filtered ("ltchars: ");
303 for (i = 0; i < (int)sizeof (struct ltchars); i++)
304 printf_filtered ("0x%x ", ((unsigned char *)&state->ltc)[i]);
305 printf_filtered ("\n");
307 printf_filtered ("lmode: 0x%x\n", state->lmode);
312 hardwire_flush_output (scb)
316 return tcflush (scb->fd, TCOFLUSH);
320 return ioctl (scb->fd, TCFLSH, 1);
324 /* This flushes both input and output, but we can't do better. */
325 return ioctl (scb->fd, TIOCFLUSH, 0);
330 hardwire_flush_input (scb)
334 return tcflush (scb->fd, TCIFLUSH);
338 return ioctl (scb->fd, TCFLSH, 0);
342 /* This flushes both input and output, but we can't do better. */
343 return ioctl (scb->fd, TIOCFLUSH, 0);
348 hardwire_send_break (scb)
354 return tcsendbreak (scb->fd, 0);
358 return ioctl (scb->fd, TCSBRK, 0);
362 status = ioctl (scb->fd, TIOCSBRK, 0);
364 status = ioctl (scb->fd, TIOCCBRK, 0);
373 struct hardwire_ttystate state;
375 if (get_tty_state(scb, &state))
376 fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
379 state.termios.c_iflag = 0;
380 state.termios.c_oflag = 0;
381 state.termios.c_lflag = 0;
382 state.termios.c_cflag &= ~(CSIZE|PARENB);
383 state.termios.c_cflag |= CS8;
384 state.termios.c_cc[VMIN] = 0;
385 state.termios.c_cc[VTIME] = 0;
389 state.termio.c_iflag = 0;
390 state.termio.c_oflag = 0;
391 state.termio.c_lflag = 0;
392 state.termio.c_cflag &= ~(CSIZE|PARENB);
393 state.termio.c_cflag |= CS8;
394 state.termio.c_cc[VMIN] = 0;
395 state.termio.c_cc[VTIME] = 0;
399 state.sgttyb.sg_flags |= RAW | ANYP;
400 state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
403 scb->current_timeout = 0;
405 if (set_tty_state (scb, &state))
406 fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
409 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
410 otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
412 For termio{s}, we actually just setup VTIME if necessary, and let the
413 timeout occur in the read() in hardwire_read().
417 wait_for(scb, timeout)
432 FD_SET(scb->fd, &readfds);
437 numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
439 numfds = select(scb->fd+1, &readfds, 0, 0, 0);
443 return SERIAL_TIMEOUT;
444 else if (errno == EINTR)
447 return SERIAL_ERROR; /* Got an error from select or poll */
452 #endif /* HAVE_SGTTY */
454 #if defined HAVE_TERMIO || defined HAVE_TERMIOS
455 if (timeout == scb->current_timeout)
459 struct hardwire_ttystate state;
461 if (get_tty_state(scb, &state))
462 fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
465 state.termios.c_cc[VTIME] = timeout * 10;
469 state.termio.c_cc[VTIME] = timeout * 10;
472 scb->current_timeout = timeout;
474 if (set_tty_state (scb, &state))
475 fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
479 #endif /* HAVE_TERMIO || HAVE_TERMIOS */
482 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
483 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
484 char if successful. Returns -2 if timeout expired, EOF if line dropped
485 dead, or -3 for any other error (see errno in that case). */
488 hardwire_readchar(scb, timeout)
494 if (scb->bufcnt-- > 0)
497 status = wait_for(scb, timeout);
502 scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
504 if (scb->bufcnt <= 0)
505 if (scb->bufcnt == 0)
506 return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
507 distinguish between EOF & timeouts
510 return SERIAL_ERROR; /* Got an error from read */
513 scb->bufp = scb->buf;
525 /* Translate baud rates from integers to damn B_codes. Unix should
526 have outgrown this crap years ago, but even POSIX wouldn't buck it. */
559 for (i = 0; baudtab[i].rate != -1; i++)
560 if (rate == baudtab[i].rate)
561 return baudtab[i].code;
567 hardwire_setbaudrate(scb, rate)
571 struct hardwire_ttystate state;
573 if (get_tty_state(scb, &state))
577 cfsetospeed (&state.termios, rate_to_code (rate));
578 cfsetispeed (&state.termios, rate_to_code (rate));
586 state.termio.c_cflag &= ~(CBAUD | CIBAUD);
587 state.termio.c_cflag |= rate_to_code (rate);
591 state.sgttyb.sg_ispeed = rate_to_code (rate);
592 state.sgttyb.sg_ospeed = rate_to_code (rate);
595 return set_tty_state (scb, &state);
599 hardwire_set_process_group (scb, ttystate, group)
601 serial_ttystate ttystate;
604 #if defined (HAVE_SGTTY) || defined (HAVE_TERMIOS)
605 ((struct hardwire_ttystate *)ttystate)->process_group = group;
611 hardwire_write(scb, str, len)
620 cc = write(scb->fd, str, len);
641 static struct serial_ops hardwire_ops =
649 hardwire_flush_output,
650 hardwire_flush_input,
653 hardwire_get_tty_state,
654 hardwire_set_tty_state,
655 hardwire_print_tty_state,
656 hardwire_noflush_set_tty_state,
657 hardwire_setbaudrate,
658 hardwire_set_process_group
662 #if defined (HAVE_TERMIOS)
666 /* This is here because this is where we figure out whether we (probably)
667 have job control. Just using job_control only does part of it because
668 setpgid or setpgrp might not exist on a system without job control.
669 It might be considered misplaced (on the other hand, process groups and
670 job control are closely related to ttys).
672 For a more clean implementation, in libiberty, put a setpgid which merely
673 calls setpgrp and a setpgrp which does nothing (any system with job control
674 will have one or the other). */
681 #if defined (NEED_POSIX_SETPGID) || defined (HAVE_TERMIOS)
682 /* Do all systems with termios have setpgid? I hope so. */
683 /* setpgid (0, 0) is supposed to work and mean the same thing as
684 this, but on Ultrix 4.2A it fails with EPERM (and
685 setpgid (getpid (), getpid ()) succeeds). */
686 retval = setpgid (getpid (), getpid ());
688 #if defined (TIOCGPGRP)
689 #if defined(USG) && !defined(SETPGRP_ARGS)
692 retval = setpgrp (getpid (), getpid ());
694 #endif /* TIOCGPGRP. */
695 #endif /* NEED_POSIX_SETPGID */
701 _initialize_ser_hardwire ()
703 serial_add_interface (&hardwire_ops);
705 /* OK, figure out whether we have job control. */
707 #if defined (HAVE_TERMIOS)
708 /* Do all systems with termios have the POSIX way of identifying job
709 control? I hope so. */
710 #ifdef _POSIX_JOB_CONTROL
713 job_control = sysconf (_SC_JOB_CONTROL);
718 /* See comment at top of file about trying to support process groups
728 #endif /* TIOCGPGRP */