aboutsummaryrefslogtreecommitdiff
path: root/gdb/ser-unix.c
blob: 9b67230a07ab8f80bb235ed5248244c8e0910db6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
/* Serial interface for local (hardwired) serial ports on Un*x like systems
   Copyright 1992, 1993 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "serial.h"
#include <fcntl.h>
#include <sys/types.h>

#if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
#define HAVE_SGTTY
#endif

#ifdef HAVE_TERMIOS
#include <termios.h>
#include <unistd.h>

struct hardwire_ttystate
{
  struct termios termios;
  pid_t process_group;
};
#endif /* termios */

#ifdef HAVE_TERMIO
#include <termio.h>

/* It is believed that all systems which have added job control to SVR3
   (e.g. sco) have also added termios.  Even if not, trying to figure out
   all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
   bewildering.  So we don't attempt it.  */

struct hardwire_ttystate
{
  struct termio termio;
};
#endif /* termio */

#ifdef HAVE_SGTTY
/* Needed for the code which uses select().  We would include <sys/select.h>
   too if it existed on all systems.  */
#include <sys/time.h>

#include <sgtty.h>

struct hardwire_ttystate
{
  struct sgttyb sgttyb;
  struct tchars tc;
  struct ltchars ltc;
  /* Line discipline flags.  */
  int lmode;

#ifdef SHORT_PGRP
  /* This is only used for the ultra.  Does it have pid_t?  */
  short process_group;
#else
  int process_group;
#endif
};
#endif /* sgtty */

static int hardwire_open PARAMS ((serial_t scb, const char *name));
static void hardwire_raw PARAMS ((serial_t scb));
static int wait_for PARAMS ((serial_t scb, int timeout));
static int hardwire_readchar PARAMS ((serial_t scb, int timeout));
static int rate_to_code PARAMS ((int rate));
static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate));
static int hardwire_write PARAMS ((serial_t scb, const char *str, int len));
static void hardwire_restore PARAMS ((serial_t scb));
static void hardwire_close PARAMS ((serial_t scb));
static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb));
static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));

/* Open up a real live device for serial I/O */

static int
hardwire_open(scb, name)
     serial_t scb;
     const char *name;
{
  scb->fd = open (name, O_RDWR);
  if (scb->fd < 0)
    return -1;

  return 0;
}

static int
get_tty_state(scb, state)
     serial_t scb;
     struct hardwire_ttystate *state;
{
#ifdef HAVE_TERMIOS
  pid_t new_process_group;

  if (tcgetattr(scb->fd, &state->termios) < 0)
    return -1;

  if (!job_control)
    return 0;

  new_process_group = tcgetpgrp (scb->fd);
  if (new_process_group == (pid_t)-1)
    return -1;
  state->process_group = new_process_group;
  return 0;
#endif

#ifdef HAVE_TERMIO
  if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
    return -1;
  return 0;
#endif

#ifdef HAVE_SGTTY
  if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
    return -1;
  if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
    return -1;
  if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
    return -1;
  if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
    return -1;

  if (!job_control)
    return 0;

  return ioctl (scb->fd, TIOCGPGRP, &state->process_group);
#endif
}

static int
set_tty_state(scb, state)
     serial_t scb;
     struct hardwire_ttystate *state;
{
#ifdef HAVE_TERMIOS
  if (tcsetattr(scb->fd, TCSANOW, &state->termios) < 0)
    return -1;

  if (!job_control)
    return 0;

  return tcsetpgrp (scb->fd, state->process_group);
#endif

#ifdef HAVE_TERMIO
  if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
    return -1;
  return 0;
#endif

#ifdef HAVE_SGTTY
  if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
    return -1;

  if (!job_control)
    return 0;

  return ioctl (scb->fd, TIOCSPGRP, &state->process_group);
#endif
}

static serial_ttystate
hardwire_get_tty_state(scb)
     serial_t scb;
{
  struct hardwire_ttystate *state;

  state = (struct hardwire_ttystate *)xmalloc(sizeof *state);

  if (get_tty_state(scb, state))
    return NULL;

  return (serial_ttystate)state;
}

static int
hardwire_set_tty_state(scb, ttystate)
     serial_t scb;
     serial_ttystate ttystate;
{
  struct hardwire_ttystate *state;

  state = (struct hardwire_ttystate *)ttystate;

  return set_tty_state(scb, state);
}

static int
hardwire_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
     serial_t scb;
     serial_ttystate new_ttystate;
     serial_ttystate old_ttystate;
{
  struct hardwire_ttystate new_state;
  struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;

  new_state = *(struct hardwire_ttystate *)new_ttystate;

#ifdef HAVE_TERMIOS
  /* I'm not sure whether this is necessary; the manpage makes no mention
     of discarding input when switching to/from ICANON.  */
  if (state->termios.c_lflag & ICANON)
    new_state.termios.c_lflag |= ICANON;
  else
    new_state.termios.c_lflag &= ~ICANON;
#endif

#ifdef HAVE_TERMIO
  /* I'm not sure whether this is necessary; the manpage makes no mention
     of discarding input when switching to/from ICANON.  */
  if (state->termio.c_lflag & ICANON)
    new_state.termio.c_lflag |= ICANON;
  else
    new_state.termio.c_lflag &= ~ICANON;
#endif

#ifdef HAVE_SGTTY
  if (state->sgttyb.sg_flags & RAW)
    new_state.sgttyb.sg_flags |= RAW;
  else
    new_state.sgttyb.sg_flags &= ~RAW;

  /* I'm not sure whether this is necessary; the manpage just mentions
     RAW not CBREAK.  */
  if (state->sgttyb.sg_flags & CBREAK)
    new_state.sgttyb.sg_flags |= CBREAK;
  else
    new_state.sgttyb.sg_flags &= ~CBREAK;
#endif

  return set_tty_state (scb, &new_state);
}

static void
hardwire_print_tty_state (scb, ttystate)
     serial_t scb;
     serial_ttystate ttystate;
{
  struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
  int i;

#ifdef HAVE_TERMIOS
  printf_filtered ("Process group = %d\n", state->process_group);

  printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
		   state->termios.c_iflag, state->termios.c_oflag);
  printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x\n",
		   state->termios.c_cflag, state->termios.c_lflag);
#if 0
  /* This not in POSIX, and is not really documented by those systems
     which have it (at least not Sun).  */
  printf_filtered ("c_line = 0x%x.\n", state->termios.c_line);
#endif
  printf_filtered ("c_cc: ");
  for (i = 0; i < NCCS; i += 1)
    printf_filtered ("0x%x ", state->termios.c_cc[i]);
  printf_filtered ("\n");
#endif

#ifdef HAVE_TERMIO
  printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
		   state->termio.c_iflag, state->termio.c_oflag);
  printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
		   state->termio.c_cflag, state->termio.c_lflag,
		   state->termio.c_line);
  printf_filtered ("c_cc: ");
  for (i = 0; i < NCC; i += 1)
    printf_filtered ("0x%x ", state->termio.c_cc[i]);
  printf_filtered ("\n");
#endif

#ifdef HAVE_SGTTY
  printf_filtered ("Process group = %d\n", state->process_group);

  printf_filtered ("sgttyb.sg_flags = 0x%x.\n", state->sgttyb.sg_flags);

  printf_filtered ("tchars: ");
  for (i = 0; i < (int)sizeof (struct tchars); i++)
    printf_filtered ("0x%x ", ((unsigned char *)&state->tc)[i]);
  printf_filtered ("\n");

  printf_filtered ("ltchars: ");
  for (i = 0; i < (int)sizeof (struct ltchars); i++)
    printf_filtered ("0x%x ", ((unsigned char *)&state->ltc)[i]);
  printf_filtered ("\n");

  printf_filtered ("lmode:  0x%x\n", state->lmode);
#endif
}

static int
hardwire_flush_output (scb)
     serial_t scb;
{
#ifdef HAVE_TERMIOS
  return tcflush (scb->fd, TCOFLUSH);
#endif

#ifdef HAVE_TERMIO
  return ioctl (scb->fd, TCFLSH, 1);
#endif

#ifdef HAVE_SGTTY
  /* This flushes both input and output, but we can't do better.  */
  return ioctl (scb->fd, TIOCFLUSH, 0);
#endif  
}

static int
hardwire_flush_input (scb)
     serial_t scb;
{
#ifdef HAVE_TERMIOS
  return tcflush (scb->fd, TCIFLUSH);
#endif

#ifdef HAVE_TERMIO
  return ioctl (scb->fd, TCFLSH, 0);
#endif

#ifdef HAVE_SGTTY
  /* This flushes both input and output, but we can't do better.  */
  return ioctl (scb->fd, TIOCFLUSH, 0);
#endif  
}

static int
hardwire_send_break (scb)
     serial_t scb;
{
  int status;

#ifdef HAVE_TERMIOS
  return tcsendbreak (scb->fd, 0);
#endif

#ifdef HAVE_TERMIO
  return ioctl (scb->fd, TCSBRK, 0);
#endif

#ifdef HAVE_SGTTY
  status = ioctl (scb->fd, TIOCSBRK, 0);
  usleep (250000);
  status = ioctl (scb->fd, TIOCCBRK, 0);
  return status;
#endif  
}

static void
hardwire_raw(scb)
     serial_t scb;
{
  struct hardwire_ttystate state;

  if (get_tty_state(scb, &state))
    fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));

#ifdef HAVE_TERMIOS
  state.termios.c_iflag = 0;
  state.termios.c_oflag = 0;
  state.termios.c_lflag = 0;
  state.termios.c_cflag &= ~(CSIZE|PARENB);
  state.termios.c_cflag |= CS8;
  state.termios.c_cc[VMIN] = 0;
  state.termios.c_cc[VTIME] = 0;
#endif

#ifdef HAVE_TERMIO
  state.termio.c_iflag = 0;
  state.termio.c_oflag = 0;
  state.termio.c_lflag = 0;
  state.termio.c_cflag &= ~(CSIZE|PARENB);
  state.termio.c_cflag |= CS8;
  state.termio.c_cc[VMIN] = 0;
  state.termio.c_cc[VTIME] = 0;
#endif

#ifdef HAVE_SGTTY
  state.sgttyb.sg_flags |= RAW | ANYP;
  state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
#endif

  scb->current_timeout = 0;

  if (set_tty_state (scb, &state))
    fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
}

/* Wait for input on scb, with timeout seconds.  Returns 0 on success,
   otherwise SERIAL_TIMEOUT or SERIAL_ERROR.

   For termio{s}, we actually just setup VTIME if necessary, and let the
   timeout occur in the read() in hardwire_read().
 */

static int
wait_for(scb, timeout)
     serial_t scb;
     int timeout;
{
  int numfds;

#ifdef HAVE_SGTTY
  struct timeval tv;
  fd_set readfds;

  FD_ZERO (&readfds);

  tv.tv_sec = timeout;
  tv.tv_usec = 0;

  FD_SET(scb->fd, &readfds);

  while (1)
    {
      if (timeout >= 0)
	numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
      else
	numfds = select(scb->fd+1, &readfds, 0, 0, 0);

      if (numfds <= 0)
	if (numfds == 0)
	  return SERIAL_TIMEOUT;
	else if (errno == EINTR)
	  continue;
	else
	  return SERIAL_ERROR;	/* Got an error from select or poll */

      return 0;
    }

#endif	/* HAVE_SGTTY */

#if defined HAVE_TERMIO || defined HAVE_TERMIOS
  if (timeout == scb->current_timeout)
    return 0;

  {
    struct hardwire_ttystate state;

    if (get_tty_state(scb, &state))
      fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));

#ifdef HAVE_TERMIOS
    state.termios.c_cc[VTIME] = timeout * 10;
#endif

#ifdef HAVE_TERMIO
    state.termio.c_cc[VTIME] = timeout * 10;
#endif

    scb->current_timeout = timeout;

    if (set_tty_state (scb, &state))
      fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));

    return 0;
  }
#endif	/* HAVE_TERMIO || HAVE_TERMIOS */
}

/* Read a character with user-specified timeout.  TIMEOUT is number of seconds
   to wait, or -1 to wait forever.  Use timeout of 0 to effect a poll.  Returns
   char if successful.  Returns -2 if timeout expired, EOF if line dropped
   dead, or -3 for any other error (see errno in that case). */

static int
hardwire_readchar(scb, timeout)
     serial_t scb;
     int timeout;
{
  int status;

  if (scb->bufcnt-- > 0)
    return *scb->bufp++;

  status = wait_for(scb, timeout);

  if (status < 0)
    return status;

  scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);

  if (scb->bufcnt <= 0)
    if (scb->bufcnt == 0)
      return SERIAL_TIMEOUT;	/* 0 chars means timeout [may need to
				   distinguish between EOF & timeouts
				   someday] */
    else
      return SERIAL_ERROR;	/* Got an error from read */

  scb->bufcnt--;
  scb->bufp = scb->buf;
  return *scb->bufp++;
}

#ifndef B19200
#define B19200 EXTA
#endif

#ifndef B38400
#define B38400 EXTB
#endif

/* Translate baud rates from integers to damn B_codes.  Unix should
   have outgrown this crap years ago, but even POSIX wouldn't buck it.  */

static struct
{
  int rate;
  int code;
}
baudtab[] =
{
  {50, B50},
  {75, B75},
  {110, B110},
  {134, B134},
  {150, B150},
  {200, B200},
  {300, B300},
  {600, B600},
  {1200, B1200},
  {1800, B1800},
  {2400, B2400},
  {4800, B4800},
  {9600, B9600},
  {19200, B19200},
  {38400, B38400},
  {-1, -1},
};

static int 
rate_to_code(rate)
     int rate;
{
  int i;

  for (i = 0; baudtab[i].rate != -1; i++)
    if (rate == baudtab[i].rate)  
      return baudtab[i].code;

  return -1;
}

static int
hardwire_setbaudrate(scb, rate)
     serial_t scb;
     int rate;
{
  struct hardwire_ttystate state;

  if (get_tty_state(scb, &state))
    return -1;

#ifdef HAVE_TERMIOS
  cfsetospeed (&state.termios, rate_to_code (rate));
  cfsetispeed (&state.termios, rate_to_code (rate));
#endif

#ifdef HAVE_TERMIO
#ifndef CIBAUD
#define CIBAUD CBAUD
#endif

  state.termio.c_cflag &= ~(CBAUD | CIBAUD);
  state.termio.c_cflag |= rate_to_code (rate);
#endif

#ifdef HAVE_SGTTY
  state.sgttyb.sg_ispeed = rate_to_code (rate);
  state.sgttyb.sg_ospeed = rate_to_code (rate);
#endif

  return set_tty_state (scb, &state);
}

static int
hardwire_set_process_group (scb, ttystate, group)
     serial_t scb;
     serial_ttystate ttystate;
     int group;
{
#if defined (HAVE_SGTTY) || defined (HAVE_TERMIOS)
  ((struct hardwire_ttystate *)ttystate)->process_group = group;
#endif
  return 0;
}

static int
hardwire_write(scb, str, len)
     serial_t scb;
     const char *str;
     int len;
{
  int cc;

  while (len > 0)
    {
      cc = write(scb->fd, str, len);

      if (cc < 0)
	return 1;
      len -= cc;
      str += cc;
    }
  return 0;
}

static void
hardwire_close(scb)
     serial_t scb;
{
  if (scb->fd < 0)
    return;

  close(scb->fd);
  scb->fd = -1;
}

static struct serial_ops hardwire_ops =
{
  "hardwire",
  0,
  hardwire_open,
  hardwire_close,
  hardwire_readchar,
  hardwire_write,
  hardwire_flush_output,
  hardwire_flush_input,
  hardwire_send_break,
  hardwire_raw,
  hardwire_get_tty_state,
  hardwire_set_tty_state,
  hardwire_print_tty_state,
  hardwire_noflush_set_tty_state,
  hardwire_setbaudrate,
  hardwire_set_process_group
};

int job_control;
#if defined (HAVE_TERMIOS)
#include <unistd.h>
#endif

/* This is here because this is where we figure out whether we (probably)
   have job control.  Just using job_control only does part of it because
   setpgid or setpgrp might not exist on a system without job control.
   It might be considered misplaced (on the other hand, process groups and
   job control are closely related to ttys).

   For a more clean implementation, in libiberty, put a setpgid which merely
   calls setpgrp and a setpgrp which does nothing (any system with job control
   will have one or the other).  */
int
gdb_setpgid ()
{
  int retval = 0;
  if (job_control)
    {
#if defined (NEED_POSIX_SETPGID) || defined (HAVE_TERMIOS)
      /* Do all systems with termios have setpgid?  I hope so.  */
      /* setpgid (0, 0) is supposed to work and mean the same thing as
	 this, but on Ultrix 4.2A it fails with EPERM (and
	 setpgid (getpid (), getpid ()) succeeds).  */
      retval = setpgid (getpid (), getpid ());
#else
#if defined (TIOCGPGRP)
#if defined(USG) && !defined(SETPGRP_ARGS)
      retval = setpgrp ();
#else
      retval = setpgrp (getpid (), getpid ());
#endif /* USG */
#endif /* TIOCGPGRP.  */
#endif /* NEED_POSIX_SETPGID */
    }
  return retval;
}

void
_initialize_ser_hardwire ()
{
  serial_add_interface (&hardwire_ops);

  /* OK, figure out whether we have job control.  */

#if defined (HAVE_TERMIOS)
  /* Do all systems with termios have the POSIX way of identifying job
     control?  I hope so.  */
#ifdef _POSIX_JOB_CONTROL
  job_control = 1;
#else
  job_control = sysconf (_SC_JOB_CONTROL);
#endif
#endif /* termios */

#ifdef HAVE_TERMIO
  /* See comment at top of file about trying to support process groups
     with termio.  */
  job_control = 0;
#endif /* termio */

#ifdef HAVE_SGTTY
#ifdef TIOCGPGRP
  job_control = 1;
#else
  job_control = 0;
#endif /* TIOCGPGRP */
#endif /* sgtty */

}