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
|
/* Low level interface to ptrace, for GDB when running under Unix.
Copyright (C) 1986, 1987, 1989, 1991 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 <stdio.h>
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "command.h"
#include "signals.h"
#include "terminal.h"
#include "target.h"
#ifdef USG
#include <sys/types.h>
#endif
/* Some USG-esque systems (some of which are BSD-esque enough so that USG
is not defined) want this header, and it won't do any harm. */
#include <fcntl.h>
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
extern struct target_ops child_ops;
/* Nonzero if we are debugging an attached outside process
rather than an inferior. */
int attach_flag;
/* Record terminal status separately for debugger and inferior. */
static TERMINAL sg_inferior;
static TERMINAL sg_ours;
static int tflags_inferior;
static int tflags_ours;
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
static struct tchars tc_inferior;
static struct tchars tc_ours;
#endif
#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
static struct ltchars ltc_inferior;
static struct ltchars ltc_ours;
#endif
#ifdef TIOCLGET
static int lmode_inferior;
static int lmode_ours;
#endif
#ifdef TIOCGPGRP
# ifdef SHORT_PGRP
static short pgrp_inferior;
static short pgrp_ours;
# else
static int pgrp_inferior;
static int pgrp_ours;
# endif
#else
static void (*sigint_ours) ();
static void (*sigquit_ours) ();
#endif /* TIOCGPGRP */
/* Copy of inferior_io_terminal when inferior was last started. */
static char *inferior_thisrun_terminal;
static void terminal_ours_1 ();
/* Nonzero if our terminal settings are in effect.
Zero if the inferior's settings are in effect. */
static int terminal_is_ours;
/* Initialize the terminal settings we record for the inferior,
before we actually run the inferior. */
void
terminal_init_inferior ()
{
sg_inferior = sg_ours;
tflags_inferior = tflags_ours;
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
tc_inferior = tc_ours;
#endif
#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
ltc_inferior = ltc_ours;
#endif
#ifdef TIOCLGET
lmode_inferior = lmode_ours;
#endif
#ifdef TIOCGPGRP
pgrp_inferior = inferior_pid;
#endif /* TIOCGPGRP */
terminal_is_ours = 1;
}
/* Put the inferior's terminal settings into effect.
This is preparation for starting or resuming the inferior. */
void
terminal_inferior ()
{
if (terminal_is_ours && inferior_thisrun_terminal == 0)
{
fcntl (0, F_SETFL, tflags_inferior);
fcntl (0, F_SETFL, tflags_inferior);
ioctl (0, TIOCSETN, &sg_inferior);
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
ioctl (0, TIOCSETC, &tc_inferior);
#endif
#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
ioctl (0, TIOCSLTC, <c_inferior);
#endif
#ifdef TIOCLGET
ioctl (0, TIOCLSET, &lmode_inferior);
#endif
#ifdef TIOCGPGRP
ioctl (0, TIOCSPGRP, &pgrp_inferior);
#else
sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN);
sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN);
#endif /* TIOCGPGRP */
}
terminal_is_ours = 0;
}
/* Put some of our terminal settings into effect,
enough to get proper results from our output,
but do not change into or out of RAW mode
so that no input is discarded.
After doing this, either terminal_ours or terminal_inferior
should be called to get back to a normal state of affairs. */
void
terminal_ours_for_output ()
{
terminal_ours_1 (1);
}
/* Put our terminal settings into effect.
First record the inferior's terminal settings
so they can be restored properly later. */
void
terminal_ours ()
{
terminal_ours_1 (0);
}
static void
terminal_ours_1 (output_only)
int output_only;
{
#ifdef TIOCGPGRP
/* Ignore this signal since it will happen when we try to set the pgrp. */
void (*osigttou) ();
#endif /* TIOCGPGRP */
/* The check for inferior_thisrun_terminal had been commented out
when the call to ioctl (TIOCNOTTY) was commented out.
Checking inferior_thisrun_terminal is necessary so that
if GDB is running in the background, it won't block trying
to do the ioctl()'s below. */
if (inferior_thisrun_terminal != 0)
return;
if (!terminal_is_ours)
{
terminal_is_ours = 1;
#ifdef TIOCGPGRP
osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN);
ioctl (0, TIOCGPGRP, &pgrp_inferior);
ioctl (0, TIOCSPGRP, &pgrp_ours);
signal (SIGTTOU, osigttou);
#else
signal (SIGINT, sigint_ours);
signal (SIGQUIT, sigquit_ours);
#endif /* TIOCGPGRP */
tflags_inferior = fcntl (0, F_GETFL, 0);
ioctl (0, TIOCGETP, &sg_inferior);
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
ioctl (0, TIOCGETC, &tc_inferior);
#endif
#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
ioctl (0, TIOCGLTC, <c_inferior);
#endif
#ifdef TIOCLGET
ioctl (0, TIOCLGET, &lmode_inferior);
#endif
}
#ifdef HAVE_TERMIO
sg_ours.c_lflag |= ICANON;
if (output_only && !(sg_inferior.c_lflag & ICANON))
sg_ours.c_lflag &= ~ICANON;
#else /* not HAVE_TERMIO */
sg_ours.sg_flags &= ~RAW & ~CBREAK;
if (output_only)
sg_ours.sg_flags |= (RAW | CBREAK) & sg_inferior.sg_flags;
#endif /* not HAVE_TERMIO */
fcntl (0, F_SETFL, tflags_ours);
fcntl (0, F_SETFL, tflags_ours);
ioctl (0, TIOCSETN, &sg_ours);
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
ioctl (0, TIOCSETC, &tc_ours);
#endif
#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
ioctl (0, TIOCSLTC, <c_ours);
#endif
#ifdef TIOCLGET
ioctl (0, TIOCLSET, &lmode_ours);
#endif
#ifdef HAVE_TERMIO
sg_ours.c_lflag |= ICANON;
#else /* not HAVE_TERMIO */
sg_ours.sg_flags &= ~RAW & ~CBREAK;
#endif /* not HAVE_TERMIO */
}
/* ARGSUSED */
void
term_info (arg, from_tty)
char *arg;
int from_tty;
{
target_terminal_info (arg, from_tty);
}
/* ARGSUSED */
void
child_terminal_info (args, from_tty)
char *args;
int from_tty;
{
register int i;
printf_filtered ("Inferior's terminal status (currently saved by GDB):\n");
#ifdef HAVE_TERMIO
printf_filtered ("fcntl flags = 0x%x, c_iflag = 0x%x, c_oflag = 0x%x,\n",
tflags_inferior, sg_inferior.c_iflag, sg_inferior.c_oflag);
printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
sg_inferior.c_cflag, sg_inferior.c_lflag, sg_inferior.c_line);
printf_filtered ("c_cc: ");
for (i = 0; (i < NCC); i += 1)
printf_filtered ("0x%x ", sg_inferior.c_cc[i]);
printf_filtered ("\n");
#else /* not HAVE_TERMIO */
printf_filtered ("fcntl flags = 0x%x, sgttyb.sg_flags = 0x%x, owner pid = %d.\n",
tflags_inferior, sg_inferior.sg_flags, pgrp_inferior);
#endif /* not HAVE_TERMIO */
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
printf_filtered ("tchars: ");
for (i = 0; i < (int)sizeof (struct tchars); i++)
printf_filtered ("0x%x ", ((char *)&tc_inferior)[i]);
printf_filtered ("\n");
#endif
#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
printf_filtered ("ltchars: ");
for (i = 0; i < (int)sizeof (struct ltchars); i++)
printf_filtered ("0x%x ", ((char *)<c_inferior)[i]);
printf_filtered ("\n");
#endif
#ifdef TIOCLGET
printf_filtered ("lmode: 0x%x\n", lmode_inferior);
#endif
}
/* NEW_TTY_PREFORK is called before forking a new child process,
so we can record the state of ttys in the child to be formed.
TTYNAME is null if we are to share the terminal with gdb;
or points to a string containing the name of the desired tty.
NEW_TTY is called in new child processes under Unix, which will
become debugger target processes. This actually switches to
the terminal specified in the NEW_TTY_PREFORK call. */
void
new_tty_prefork (ttyname)
char *ttyname;
{
/* Save the name for later, for determining whether we and the child
are sharing a tty. */
inferior_thisrun_terminal = ttyname;
}
void
new_tty ()
{
register int tty;
if (inferior_thisrun_terminal == 0)
return;
#ifdef TIOCNOTTY
/* Disconnect the child process from our controlling terminal. */
tty = open("/dev/tty", O_RDWR);
if (tty > 0)
{
ioctl(tty, TIOCNOTTY, 0);
close(tty);
}
#endif
/* Now open the specified new terminal. */
#ifdef USE_O_NOCTTY
tty = open(inferior_thisrun_terminal, O_RDWR | O_NOCTTY);
#else
tty = open(inferior_thisrun_terminal, O_RDWR);
#endif
if (tty == -1)
{
print_sys_errmsg (inferior_thisrun_terminal, errno);
_exit(1);
}
/* Avoid use of dup2; doesn't exist on all systems. */
if (tty != 0)
{ close (0); dup (tty); }
if (tty != 1)
{ close (1); dup (tty); }
if (tty != 2)
{ close (2); dup (tty); }
if (tty > 2)
close(tty);
}
/* Kill the inferior process. Make us have no inferior. */
/* ARGSUSED */
static void
kill_command (arg, from_tty)
char *arg;
int from_tty;
{
if (inferior_pid == 0)
error ("The program is not being run.");
if (!query ("Kill the inferior process? "))
error ("Not confirmed.");
target_kill (arg, from_tty);
/* Killing off the inferior can leave us with a core file. If so,
print the state we are left in. */
if (target_has_stack) {
printf_filtered ("In %s,\n", current_target->to_longname);
if (selected_frame == NULL)
fputs_filtered ("No selected stack frame.\n", stdout);
else
print_stack_frame (selected_frame, selected_frame_level, 1);
}
}
/* The inferior process has died. Long live the inferior! */
void
generic_mourn_inferior ()
{
inferior_pid = 0;
attach_flag = 0;
mark_breakpoints_out ();
registers_changed ();
#ifdef CLEAR_DEFERRED_STORES
/* Delete any pending stores to the inferior... */
CLEAR_DEFERRED_STORES;
#endif
reopen_exec_file ();
if (target_has_stack) {
set_current_frame ( create_new_frame (read_register (FP_REGNUM),
read_pc ()));
select_frame (get_current_frame (), 0);
} else {
set_current_frame (0);
select_frame ((FRAME) 0, -1);
}
/* It is confusing to the user for ignore counts to stick around
from previous runs of the inferior. So clear them. */
breakpoint_clear_ignore_counts ();
}
void
child_mourn_inferior ()
{
unpush_target (&child_ops);
generic_mourn_inferior ();
}
#if 0
/* This function is just for testing, and on some systems (Sony NewsOS
3.2) <sys/user.h> also includes <sys/time.h> which leads to errors
(since on this system at least sys/time.h is not protected against
multiple inclusion). */
/* ARGSUSED */
static void
try_writing_regs_command (arg, from_tty)
char *arg;
int from_tty;
{
register int i;
register int value;
if (inferior_pid == 0)
error ("There is no inferior process now.");
/* A Sun 3/50 or 3/60 (at least) running SunOS 4.0.3 will have a
kernel panic if we try to write past the end of the user area.
Presumably Sun will fix this bug (it has been reported), but it
is tacky to crash the system, so at least on SunOS4 we need to
stop writing when we hit the end of the user area. */
for (i = 0; i < sizeof (struct user); i += 2)
{
QUIT;
errno = 0;
value = call_ptrace (3, inferior_pid, i, 0);
call_ptrace (6, inferior_pid, i, value);
if (errno == 0)
{
printf (" Succeeded with address 0x%x; value 0x%x (%d).\n",
i, value, value);
}
else if ((i & 0377) == 0)
printf (" Failed at 0x%x.\n", i);
}
}
#endif
void
_initialize_inflow ()
{
add_info ("terminal", term_info,
"Print inferior's saved terminal status.");
#if 0
add_com ("try-writing-regs", class_obscure, try_writing_regs_command,
"Try writing all locations in inferior's system block.\n\
Report which ones can be written.");
#endif
add_com ("kill", class_run, kill_command,
"Kill execution of program being debugged.");
inferior_pid = 0;
ioctl (0, TIOCGETP, &sg_ours);
tflags_ours = fcntl (0, F_GETFL, 0);
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
ioctl (0, TIOCGETC, &tc_ours);
#endif
#if defined(TIOCGLTC) && !defined(TIOCGLTC_BROKEN)
ioctl (0, TIOCGLTC, <c_ours);
#endif
#ifdef TIOCLGET
ioctl (0, TIOCLGET, &lmode_ours);
#endif
#ifdef TIOCGPGRP
ioctl (0, TIOCGPGRP, &pgrp_ours);
#endif /* TIOCGPGRP */
terminal_is_ours = 1;
}
|