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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [event-top.c] - Blame information for rev 157

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1 24 jeremybenn
/* Top level stuff for GDB, the GNU debugger.
2
 
3
   Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008
4
   Free Software Foundation, Inc.
5
 
6
   Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
7
 
8
   This file is part of GDB.
9
 
10
   This program is free software; you can redistribute it and/or modify
11
   it under the terms of the GNU General Public License as published by
12
   the Free Software Foundation; either version 3 of the License, or
13
   (at your option) any later version.
14
 
15
   This program is distributed in the hope that it will be useful,
16
   but WITHOUT ANY WARRANTY; without even the implied warranty of
17
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18
   GNU General Public License for more details.
19
 
20
   You should have received a copy of the GNU General Public License
21
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
22
 
23
#include "defs.h"
24
#include "top.h"
25
#include "inferior.h"
26
#include "target.h"
27
#include "terminal.h"           /* for job_control */
28
#include "event-loop.h"
29
#include "event-top.h"
30
#include "interps.h"
31
#include <signal.h>
32
#include "exceptions.h"
33
#include "cli/cli-script.h"     /* for reset_command_nest_depth */
34
 
35
/* For dont_repeat() */
36
#include "gdbcmd.h"
37
 
38
/* readline include files */
39
#include "readline/readline.h"
40
#include "readline/history.h"
41
 
42
/* readline defines this.  */
43
#undef savestring
44
 
45
static void rl_callback_read_char_wrapper (gdb_client_data client_data);
46
static void command_line_handler (char *rl);
47
static void command_line_handler_continuation (struct continuation_arg *arg);
48
static void change_line_handler (void);
49
static void change_annotation_level (void);
50
static void command_handler (char *command);
51
 
52
/* Signal handlers. */
53
#ifdef SIGQUIT
54
static void handle_sigquit (int sig);
55
#endif
56
#ifdef SIGHUP
57
static void handle_sighup (int sig);
58
#endif
59
static void handle_sigfpe (int sig);
60
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
61
static void handle_sigwinch (int sig);
62
#endif
63
 
64
/* Functions to be invoked by the event loop in response to
65
   signals. */
66
#if defined (SIGQUIT) || defined (SIGHUP)
67
static void async_do_nothing (gdb_client_data);
68
#endif
69
#ifdef SIGHUP
70
static void async_disconnect (gdb_client_data);
71
#endif
72
static void async_float_handler (gdb_client_data);
73
#ifdef STOP_SIGNAL
74
static void async_stop_sig (gdb_client_data);
75
#endif
76
 
77
/* Readline offers an alternate interface, via callback
78
   functions. These are all included in the file callback.c in the
79
   readline distribution.  This file provides (mainly) a function, which
80
   the event loop uses as callback (i.e. event handler) whenever an event
81
   is detected on the standard input file descriptor.
82
   readline_callback_read_char is called (by the GDB event loop) whenever
83
   there is a new character ready on the input stream. This function
84
   incrementally builds a buffer internal to readline where it
85
   accumulates the line read up to the point of invocation.  In the
86
   special case in which the character read is newline, the function
87
   invokes a GDB supplied callback routine, which does the processing of
88
   a full command line.  This latter routine is the asynchronous analog
89
   of the old command_line_input in gdb. Instead of invoking (and waiting
90
   for) readline to read the command line and pass it back to
91
   command_loop for processing, the new command_line_handler function has
92
   the command line already available as its parameter.  INPUT_HANDLER is
93
   to be set to the function that readline will invoke when a complete
94
   line of input is ready.  CALL_READLINE is to be set to the function
95
   that readline offers as callback to the event_loop. */
96
 
97
void (*input_handler) (char *);
98
void (*call_readline) (gdb_client_data);
99
 
100
/* Important variables for the event loop. */
101
 
102
/* This is used to determine if GDB is using the readline library or
103
   its own simplified form of readline. It is used by the asynchronous
104
   form of the set editing command.
105
   ezannoni: as of 1999-04-29 I expect that this
106
   variable will not be used after gdb is changed to use the event
107
   loop as default engine, and event-top.c is merged into top.c. */
108
int async_command_editing_p;
109
 
110
/* This variable contains the new prompt that the user sets with the
111
   set prompt command. */
112
char *new_async_prompt;
113
 
114
/* This is the annotation suffix that will be used when the
115
   annotation_level is 2. */
116
char *async_annotation_suffix;
117
 
118
/* This is used to display the notification of the completion of an
119
   asynchronous execution command. */
120
int exec_done_display_p = 0;
121
 
122
/* This is the file descriptor for the input stream that GDB uses to
123
   read commands from. */
124
int input_fd;
125
 
126
/* This is the prompt stack. Prompts will be pushed on the stack as
127
   needed by the different 'kinds' of user inputs GDB is asking
128
   for. See event-loop.h. */
129
struct prompts the_prompts;
130
 
131
/* signal handling variables */
132
/* Each of these is a pointer to a function that the event loop will
133
   invoke if the corresponding signal has received. The real signal
134
   handlers mark these functions as ready to be executed and the event
135
   loop, in a later iteration, calls them. See the function
136
   invoke_async_signal_handler. */
137
void *sigint_token;
138
#ifdef SIGHUP
139
void *sighup_token;
140
#endif
141
#ifdef SIGQUIT
142
void *sigquit_token;
143
#endif
144
void *sigfpe_token;
145
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
146
void *sigwinch_token;
147
#endif
148
#ifdef STOP_SIGNAL
149
void *sigtstp_token;
150
#endif
151
 
152
/* Structure to save a partially entered command.  This is used when
153
   the user types '\' at the end of a command line. This is necessary
154
   because each line of input is handled by a different call to
155
   command_line_handler, and normally there is no state retained
156
   between different calls. */
157
int more_to_come = 0;
158
 
159
struct readline_input_state
160
  {
161
    char *linebuffer;
162
    char *linebuffer_ptr;
163
  }
164
readline_input_state;
165
 
166
/* This hook is called by rl_callback_read_char_wrapper after each
167
   character is processed.  */
168
void (*after_char_processing_hook) ();
169
 
170
 
171
/* Wrapper function for calling into the readline library. The event
172
   loop expects the callback function to have a paramter, while readline
173
   expects none. */
174
static void
175
rl_callback_read_char_wrapper (gdb_client_data client_data)
176
{
177
  rl_callback_read_char ();
178
  if (after_char_processing_hook)
179
    (*after_char_processing_hook) ();
180
}
181
 
182
/* Initialize all the necessary variables, start the event loop,
183
   register readline, and stdin, start the loop. */
184
void
185
cli_command_loop (void)
186
{
187
  /* If we are using readline, set things up and display the first
188
     prompt, otherwise just print the prompt. */
189
  if (async_command_editing_p)
190
    {
191
      int length;
192
      char *a_prompt;
193
      char *gdb_prompt = get_prompt ();
194
 
195
      /* Tell readline what the prompt to display is and what function it
196
         will need to call after a whole line is read. This also displays
197
         the first prompt. */
198
      length = strlen (PREFIX (0))
199
        + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
200
      a_prompt = (char *) alloca (length);
201
      strcpy (a_prompt, PREFIX (0));
202
      strcat (a_prompt, gdb_prompt);
203
      strcat (a_prompt, SUFFIX (0));
204
      rl_callback_handler_install (a_prompt, input_handler);
205
    }
206
  else
207
    display_gdb_prompt (0);
208
 
209
  /* Now it's time to start the event loop. */
210
  start_event_loop ();
211
}
212
 
213
/* Change the function to be invoked every time there is a character
214
   ready on stdin. This is used when the user sets the editing off,
215
   therefore bypassing readline, and letting gdb handle the input
216
   itself, via gdb_readline2. Also it is used in the opposite case in
217
   which the user sets editing on again, by restoring readline
218
   handling of the input. */
219
static void
220
change_line_handler (void)
221
{
222
  /* NOTE: this operates on input_fd, not instream. If we are reading
223
     commands from a file, instream will point to the file. However in
224
     async mode, we always read commands from a file with editing
225
     off. This means that the 'set editing on/off' will have effect
226
     only on the interactive session. */
227
 
228
  if (async_command_editing_p)
229
    {
230
      /* Turn on editing by using readline. */
231
      call_readline = rl_callback_read_char_wrapper;
232
      input_handler = command_line_handler;
233
    }
234
  else
235
    {
236
      /* Turn off editing by using gdb_readline2. */
237
      rl_callback_handler_remove ();
238
      call_readline = gdb_readline2;
239
 
240
      /* Set up the command handler as well, in case we are called as
241
         first thing from .gdbinit. */
242
      input_handler = command_line_handler;
243
    }
244
}
245
 
246
/* Displays the prompt. The prompt that is displayed is the current
247
   top of the prompt stack, if the argument NEW_PROMPT is
248
   0. Otherwise, it displays whatever NEW_PROMPT is. This is used
249
   after each gdb command has completed, and in the following cases:
250
   1. when the user enters a command line which is ended by '\'
251
   indicating that the command will continue on the next line.
252
   In that case the prompt that is displayed is the empty string.
253
   2. When the user is entering 'commands' for a breakpoint, or
254
   actions for a tracepoint. In this case the prompt will be '>'
255
   3. Other????
256
   FIXME: 2. & 3. not implemented yet for async. */
257
void
258
display_gdb_prompt (char *new_prompt)
259
{
260
  int prompt_length = 0;
261
  char *gdb_prompt = get_prompt ();
262
 
263
  /* Reset the nesting depth used when trace-commands is set.  */
264
  reset_command_nest_depth ();
265
 
266
  /* Each interpreter has its own rules on displaying the command
267
     prompt.  */
268
  if (!current_interp_display_prompt_p ())
269
    return;
270
 
271
  if (target_executing && sync_execution)
272
    {
273
      /* This is to trick readline into not trying to display the
274
         prompt.  Even though we display the prompt using this
275
         function, readline still tries to do its own display if we
276
         don't call rl_callback_handler_install and
277
         rl_callback_handler_remove (which readline detects because a
278
         global variable is not set). If readline did that, it could
279
         mess up gdb signal handlers for SIGINT.  Readline assumes
280
         that between calls to rl_set_signals and rl_clear_signals gdb
281
         doesn't do anything with the signal handlers. Well, that's
282
         not the case, because when the target executes we change the
283
         SIGINT signal handler. If we allowed readline to display the
284
         prompt, the signal handler change would happen exactly
285
         between the calls to the above two functions.
286
         Calling rl_callback_handler_remove(), does the job. */
287
 
288
      rl_callback_handler_remove ();
289
      return;
290
    }
291
 
292
  if (!new_prompt)
293
    {
294
      /* Just use the top of the prompt stack. */
295
      prompt_length = strlen (PREFIX (0)) +
296
        strlen (SUFFIX (0)) +
297
        strlen (gdb_prompt) + 1;
298
 
299
      new_prompt = (char *) alloca (prompt_length);
300
 
301
      /* Prefix needs to have new line at end. */
302
      strcpy (new_prompt, PREFIX (0));
303
      strcat (new_prompt, gdb_prompt);
304
      /* Suffix needs to have a new line at end and \032 \032 at
305
         beginning. */
306
      strcat (new_prompt, SUFFIX (0));
307
    }
308
 
309
  if (async_command_editing_p)
310
    {
311
      rl_callback_handler_remove ();
312
      rl_callback_handler_install (new_prompt, input_handler);
313
    }
314
  /* new_prompt at this point can be the top of the stack or the one passed in */
315
  else if (new_prompt)
316
    {
317
      /* Don't use a _filtered function here.  It causes the assumed
318
         character position to be off, since the newline we read from
319
         the user is not accounted for.  */
320
      fputs_unfiltered (new_prompt, gdb_stdout);
321
      gdb_flush (gdb_stdout);
322
    }
323
}
324
 
325
/* Used when the user requests a different annotation level, with
326
   'set annotate'. It pushes a new prompt (with prefix and suffix) on top
327
   of the prompt stack, if the annotation level desired is 2, otherwise
328
   it pops the top of the prompt stack when we want the annotation level
329
   to be the normal ones (1 or 0). */
330
static void
331
change_annotation_level (void)
332
{
333
  char *prefix, *suffix;
334
 
335
  if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
336
    {
337
      /* The prompt stack has not been initialized to "", we are
338
         using gdb w/o the --async switch */
339
      warning (_("Command has same effect as set annotate"));
340
      return;
341
    }
342
 
343
  if (annotation_level > 1)
344
    {
345
      if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
346
        {
347
          /* Push a new prompt if the previous annotation_level was not >1. */
348
          prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
349
          strcpy (prefix, "\n\032\032pre-");
350
          strcat (prefix, async_annotation_suffix);
351
          strcat (prefix, "\n");
352
 
353
          suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
354
          strcpy (suffix, "\n\032\032");
355
          strcat (suffix, async_annotation_suffix);
356
          strcat (suffix, "\n");
357
 
358
          push_prompt (prefix, (char *) 0, suffix);
359
        }
360
    }
361
  else
362
    {
363
      if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
364
        {
365
          /* Pop the top of the stack, we are going back to annotation < 1. */
366
          pop_prompt ();
367
        }
368
    }
369
}
370
 
371
/* Pushes a new prompt on the prompt stack. Each prompt has three
372
   parts: prefix, prompt, suffix. Usually prefix and suffix are empty
373
   strings, except when the annotation level is 2. Memory is allocated
374
   within savestring for the new prompt. */
375
void
376
push_prompt (char *prefix, char *prompt, char *suffix)
377
{
378
  the_prompts.top++;
379
  PREFIX (0) = savestring (prefix, strlen (prefix));
380
 
381
  /* Note that this function is used by the set annotate 2
382
     command. This is why we take care of saving the old prompt
383
     in case a new one is not specified. */
384
  if (prompt)
385
    PROMPT (0) = savestring (prompt, strlen (prompt));
386
  else
387
    PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1)));
388
 
389
  SUFFIX (0) = savestring (suffix, strlen (suffix));
390
}
391
 
392
/* Pops the top of the prompt stack, and frees the memory allocated for it. */
393
void
394
pop_prompt (void)
395
{
396
  /* If we are not during a 'synchronous' execution command, in which
397
     case, the top prompt would be empty. */
398
  if (strcmp (PROMPT (0), ""))
399
    /* This is for the case in which the prompt is set while the
400
       annotation level is 2. The top prompt will be changed, but when
401
       we return to annotation level < 2, we want that new prompt to be
402
       in effect, until the user does another 'set prompt'. */
403
    if (strcmp (PROMPT (0), PROMPT (-1)))
404
      {
405
        xfree (PROMPT (-1));
406
        PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0)));
407
      }
408
 
409
  xfree (PREFIX (0));
410
  xfree (PROMPT (0));
411
  xfree (SUFFIX (0));
412
  the_prompts.top--;
413
}
414
 
415
/* When there is an event ready on the stdin file desriptor, instead
416
   of calling readline directly throught the callback function, or
417
   instead of calling gdb_readline2, give gdb a chance to detect
418
   errors and do something. */
419
void
420
stdin_event_handler (int error, gdb_client_data client_data)
421
{
422
  if (error)
423
    {
424
      printf_unfiltered (_("error detected on stdin\n"));
425
      delete_file_handler (input_fd);
426
      discard_all_continuations ();
427
      /* If stdin died, we may as well kill gdb. */
428
      quit_command ((char *) 0, stdin == instream);
429
    }
430
  else
431
    (*call_readline) (client_data);
432
}
433
 
434
/* Re-enable stdin after the end of an execution command in
435
   synchronous mode, or after an error from the target, and we aborted
436
   the exec operation. */
437
 
438
void
439
async_enable_stdin (void *dummy)
440
{
441
  /* See NOTE in async_disable_stdin() */
442
  /* FIXME: cagney/1999-09-27: Call this before clearing
443
     sync_execution.  Current target_terminal_ours() implementations
444
     check for sync_execution before switching the terminal. */
445
  target_terminal_ours ();
446
  pop_prompt ();
447
  sync_execution = 0;
448
}
449
 
450
/* Disable reads from stdin (the console) marking the command as
451
   synchronous. */
452
 
453
void
454
async_disable_stdin (void)
455
{
456
  sync_execution = 1;
457
  push_prompt ("", "", "");
458
  /* FIXME: cagney/1999-09-27: At present this call is technically
459
     redundant since infcmd.c and infrun.c both already call
460
     target_terminal_inferior().  As the terminal handling (in
461
     sync/async mode) is refined, the duplicate calls can be
462
     eliminated (Here or in infcmd.c/infrun.c). */
463
  target_terminal_inferior ();
464
  /* Add the reinstate of stdin to the list of cleanups to be done
465
     in case the target errors out and dies. These cleanups are also
466
     done in case of normal successful termination of the execution
467
     command, by complete_execution(). */
468
  make_exec_error_cleanup (async_enable_stdin, NULL);
469
}
470
 
471
 
472
/* Handles a gdb command. This function is called by
473
   command_line_handler, which has processed one or more input lines
474
   into COMMAND. */
475
/* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
476
   function.  The command_loop function will be obsolete when we
477
   switch to use the event loop at every execution of gdb. */
478
static void
479
command_handler (char *command)
480
{
481
  struct cleanup *old_chain;
482
  int stdin_is_tty = ISATTY (stdin);
483
  struct continuation_arg *arg1;
484
  struct continuation_arg *arg2;
485
  long time_at_cmd_start;
486
#ifdef HAVE_SBRK
487
  long space_at_cmd_start = 0;
488
#endif
489
  extern int display_time;
490
  extern int display_space;
491
 
492
  quit_flag = 0;
493
  if (instream == stdin && stdin_is_tty)
494
    reinitialize_more_filter ();
495
  old_chain = make_cleanup (null_cleanup, 0);
496
 
497
  /* If readline returned a NULL command, it means that the
498
     connection with the terminal is gone. This happens at the
499
     end of a testsuite run, after Expect has hung up
500
     but GDB is still alive. In such a case, we just quit gdb
501
     killing the inferior program too. */
502
  if (command == 0)
503
    {
504
      printf_unfiltered ("quit\n");
505
      execute_command ("quit", stdin == instream);
506
    }
507
 
508
  time_at_cmd_start = get_run_time ();
509
 
510
  if (display_space)
511
    {
512
#ifdef HAVE_SBRK
513
      char *lim = (char *) sbrk (0);
514
      space_at_cmd_start = lim - lim_at_start;
515
#endif
516
    }
517
 
518
  execute_command (command, instream == stdin);
519
 
520
  /* Set things up for this function to be compete later, once the
521
     execution has completed, if we are doing an execution command,
522
     otherwise, just go ahead and finish. */
523
  if (target_can_async_p () && target_executing)
524
    {
525
      arg1 =
526
        (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
527
      arg2 =
528
        (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
529
      arg1->next = arg2;
530
      arg2->next = NULL;
531
      arg1->data.longint = time_at_cmd_start;
532
#ifdef HAVE_SBRK
533
      arg2->data.longint = space_at_cmd_start;
534
#endif
535
      add_continuation (command_line_handler_continuation, arg1);
536
    }
537
 
538
  /* Do any commands attached to breakpoint we stopped at. Only if we
539
     are always running synchronously. Or if we have just executed a
540
     command that doesn't start the target. */
541
  if (!target_can_async_p () || !target_executing)
542
    {
543
      bpstat_do_actions (&stop_bpstat);
544
      do_cleanups (old_chain);
545
 
546
      if (display_time)
547
        {
548
          long cmd_time = get_run_time () - time_at_cmd_start;
549
 
550
          printf_unfiltered (_("Command execution time: %ld.%06ld\n"),
551
                             cmd_time / 1000000, cmd_time % 1000000);
552
        }
553
 
554
      if (display_space)
555
        {
556
#ifdef HAVE_SBRK
557
          char *lim = (char *) sbrk (0);
558
          long space_now = lim - lim_at_start;
559
          long space_diff = space_now - space_at_cmd_start;
560
 
561
          printf_unfiltered (_("Space used: %ld (%c%ld for this command)\n"),
562
                             space_now,
563
                             (space_diff >= 0 ? '+' : '-'),
564
                             space_diff);
565
#endif
566
        }
567
    }
568
}
569
 
570
/* Do any commands attached to breakpoint we stopped at. Only if we
571
   are always running synchronously. Or if we have just executed a
572
   command that doesn't start the target. */
573
void
574
command_line_handler_continuation (struct continuation_arg *arg)
575
{
576
  extern int display_time;
577
  extern int display_space;
578
 
579
  long time_at_cmd_start  = arg->data.longint;
580
  long space_at_cmd_start = arg->next->data.longint;
581
 
582
  bpstat_do_actions (&stop_bpstat);
583
  /*do_cleanups (old_chain); *//*?????FIXME????? */
584
 
585
  if (display_time)
586
    {
587
      long cmd_time = get_run_time () - time_at_cmd_start;
588
 
589
      printf_unfiltered (_("Command execution time: %ld.%06ld\n"),
590
                         cmd_time / 1000000, cmd_time % 1000000);
591
    }
592
  if (display_space)
593
    {
594
#ifdef HAVE_SBRK
595
      char *lim = (char *) sbrk (0);
596
      long space_now = lim - lim_at_start;
597
      long space_diff = space_now - space_at_cmd_start;
598
 
599
      printf_unfiltered (_("Space used: %ld (%c%ld for this command)\n"),
600
                         space_now,
601
                         (space_diff >= 0 ? '+' : '-'),
602
                         space_diff);
603
#endif
604
    }
605
}
606
 
607
/* Handle a complete line of input. This is called by the callback
608
   mechanism within the readline library.  Deal with incomplete commands
609
   as well, by saving the partial input in a global buffer.  */
610
 
611
/* NOTE: 1999-04-30 This is the asynchronous version of the
612
   command_line_input function. command_line_input will become
613
   obsolete once we use the event loop as the default mechanism in
614
   GDB. */
615
static void
616
command_line_handler (char *rl)
617
{
618
  static char *linebuffer = 0;
619
  static unsigned linelength = 0;
620
  char *p;
621
  char *p1;
622
  extern char *line;
623
  extern int linesize;
624
  char *nline;
625
  char got_eof = 0;
626
 
627
 
628
  int repeat = (instream == stdin);
629
 
630
  if (annotation_level > 1 && instream == stdin)
631
    {
632
      printf_unfiltered (("\n\032\032post-"));
633
      puts_unfiltered (async_annotation_suffix);
634
      printf_unfiltered (("\n"));
635
    }
636
 
637
  if (linebuffer == 0)
638
    {
639
      linelength = 80;
640
      linebuffer = (char *) xmalloc (linelength);
641
    }
642
 
643
  p = linebuffer;
644
 
645
  if (more_to_come)
646
    {
647
      strcpy (linebuffer, readline_input_state.linebuffer);
648
      p = readline_input_state.linebuffer_ptr;
649
      xfree (readline_input_state.linebuffer);
650
      more_to_come = 0;
651
      pop_prompt ();
652
    }
653
 
654
#ifdef STOP_SIGNAL
655
  if (job_control)
656
    signal (STOP_SIGNAL, handle_stop_sig);
657
#endif
658
 
659
  /* Make sure that all output has been output.  Some machines may let
660
     you get away with leaving out some of the gdb_flush, but not all.  */
661
  wrap_here ("");
662
  gdb_flush (gdb_stdout);
663
  gdb_flush (gdb_stderr);
664
 
665
  if (source_file_name != NULL)
666
    ++source_line_number;
667
 
668
  /* If we are in this case, then command_handler will call quit
669
     and exit from gdb. */
670
  if (!rl || rl == (char *) EOF)
671
    {
672
      got_eof = 1;
673
      command_handler (0);
674
      return;                   /* Lint. */
675
    }
676
  if (strlen (rl) + 1 + (p - linebuffer) > linelength)
677
    {
678
      linelength = strlen (rl) + 1 + (p - linebuffer);
679
      nline = (char *) xrealloc (linebuffer, linelength);
680
      p += nline - linebuffer;
681
      linebuffer = nline;
682
    }
683
  p1 = rl;
684
  /* Copy line.  Don't copy null at end.  (Leaves line alone
685
     if this was just a newline)  */
686
  while (*p1)
687
    *p++ = *p1++;
688
 
689
  xfree (rl);                   /* Allocated in readline.  */
690
 
691
  if (p > linebuffer && *(p - 1) == '\\')
692
    {
693
      p--;                      /* Put on top of '\'.  */
694
 
695
      readline_input_state.linebuffer = savestring (linebuffer,
696
                                                    strlen (linebuffer));
697
      readline_input_state.linebuffer_ptr = p;
698
 
699
      /* We will not invoke a execute_command if there is more
700
         input expected to complete the command. So, we need to
701
         print an empty prompt here. */
702
      more_to_come = 1;
703
      push_prompt ("", "", "");
704
      display_gdb_prompt (0);
705
      return;
706
    }
707
 
708
#ifdef STOP_SIGNAL
709
  if (job_control)
710
    signal (STOP_SIGNAL, SIG_DFL);
711
#endif
712
 
713
#define SERVER_COMMAND_LENGTH 7
714
  server_command =
715
    (p - linebuffer > SERVER_COMMAND_LENGTH)
716
    && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0;
717
  if (server_command)
718
    {
719
      /* Note that we don't set `line'.  Between this and the check in
720
         dont_repeat, this insures that repeating will still do the
721
         right thing.  */
722
      *p = '\0';
723
      command_handler (linebuffer + SERVER_COMMAND_LENGTH);
724
      display_gdb_prompt (0);
725
      return;
726
    }
727
 
728
  /* Do history expansion if that is wished.  */
729
  if (history_expansion_p && instream == stdin
730
      && ISATTY (instream))
731
    {
732
      char *history_value;
733
      int expanded;
734
 
735
      *p = '\0';                /* Insert null now.  */
736
      expanded = history_expand (linebuffer, &history_value);
737
      if (expanded)
738
        {
739
          /* Print the changes.  */
740
          printf_unfiltered ("%s\n", history_value);
741
 
742
          /* If there was an error, call this function again.  */
743
          if (expanded < 0)
744
            {
745
              xfree (history_value);
746
              return;
747
            }
748
          if (strlen (history_value) > linelength)
749
            {
750
              linelength = strlen (history_value) + 1;
751
              linebuffer = (char *) xrealloc (linebuffer, linelength);
752
            }
753
          strcpy (linebuffer, history_value);
754
          p = linebuffer + strlen (linebuffer);
755
        }
756
      xfree (history_value);
757
    }
758
 
759
  /* If we just got an empty line, and that is supposed
760
     to repeat the previous command, return the value in the
761
     global buffer.  */
762
  if (repeat && p == linebuffer && *p != '\\')
763
    {
764
      command_handler (line);
765
      display_gdb_prompt (0);
766
      return;
767
    }
768
 
769
  for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
770
  if (repeat && !*p1)
771
    {
772
      command_handler (line);
773
      display_gdb_prompt (0);
774
      return;
775
    }
776
 
777
  *p = 0;
778
 
779
  /* Add line to history if appropriate.  */
780
  if (instream == stdin
781
      && ISATTY (stdin) && *linebuffer)
782
    add_history (linebuffer);
783
 
784
  /* Note: lines consisting solely of comments are added to the command
785
     history.  This is useful when you type a command, and then
786
     realize you don't want to execute it quite yet.  You can comment
787
     out the command and then later fetch it from the value history
788
     and remove the '#'.  The kill ring is probably better, but some
789
     people are in the habit of commenting things out.  */
790
  if (*p1 == '#')
791
    *p1 = '\0';                 /* Found a comment. */
792
 
793
  /* Save into global buffer if appropriate.  */
794
  if (repeat)
795
    {
796
      if (linelength > linesize)
797
        {
798
          line = xrealloc (line, linelength);
799
          linesize = linelength;
800
        }
801
      strcpy (line, linebuffer);
802
      if (!more_to_come)
803
        {
804
          command_handler (line);
805
          display_gdb_prompt (0);
806
        }
807
      return;
808
    }
809
 
810
  command_handler (linebuffer);
811
  display_gdb_prompt (0);
812
  return;
813
}
814
 
815
/* Does reading of input from terminal w/o the editing features
816
   provided by the readline library. */
817
 
818
/* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
819
   will become obsolete when the event loop is made the default
820
   execution for gdb. */
821
void
822
gdb_readline2 (gdb_client_data client_data)
823
{
824
  int c;
825
  char *result;
826
  int input_index = 0;
827
  int result_size = 80;
828
  static int done_once = 0;
829
 
830
  /* Unbuffer the input stream, so that, later on, the calls to fgetc
831
     fetch only one char at the time from the stream. The fgetc's will
832
     get up to the first newline, but there may be more chars in the
833
     stream after '\n'. If we buffer the input and fgetc drains the
834
     stream, getting stuff beyond the newline as well, a select, done
835
     afterwards will not trigger. */
836
  if (!done_once && !ISATTY (instream))
837
    {
838
      setbuf (instream, NULL);
839
      done_once = 1;
840
    }
841
 
842
  result = (char *) xmalloc (result_size);
843
 
844
  /* We still need the while loop here, even though it would seem
845
     obvious to invoke gdb_readline2 at every character entered.  If
846
     not using the readline library, the terminal is in cooked mode,
847
     which sends the characters all at once. Poll will notice that the
848
     input fd has changed state only after enter is pressed. At this
849
     point we still need to fetch all the chars entered. */
850
 
851
  while (1)
852
    {
853
      /* Read from stdin if we are executing a user defined command.
854
         This is the right thing for prompt_for_continue, at least.  */
855
      c = fgetc (instream ? instream : stdin);
856
 
857
      if (c == EOF)
858
        {
859
          if (input_index > 0)
860
            /* The last line does not end with a newline.  Return it, and
861
               if we are called again fgetc will still return EOF and
862
               we'll return NULL then.  */
863
            break;
864
          xfree (result);
865
          (*input_handler) (0);
866
          return;
867
        }
868
 
869
      if (c == '\n')
870
        {
871
          if (input_index > 0 && result[input_index - 1] == '\r')
872
            input_index--;
873
          break;
874
        }
875
 
876
      result[input_index++] = c;
877
      while (input_index >= result_size)
878
        {
879
          result_size *= 2;
880
          result = (char *) xrealloc (result, result_size);
881
        }
882
    }
883
 
884
  result[input_index++] = '\0';
885
  (*input_handler) (result);
886
}
887
 
888
 
889
/* Initialization of signal handlers and tokens.  There is a function
890
   handle_sig* for each of the signals GDB cares about. Specifically:
891
   SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH.  These
892
   functions are the actual signal handlers associated to the signals
893
   via calls to signal().  The only job for these functions is to
894
   enqueue the appropriate event/procedure with the event loop.  Such
895
   procedures are the old signal handlers. The event loop will take
896
   care of invoking the queued procedures to perform the usual tasks
897
   associated with the reception of the signal. */
898
/* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
899
   init_signals will become obsolete as we move to have to event loop
900
   as the default for gdb. */
901
void
902
async_init_signals (void)
903
{
904
  signal (SIGINT, handle_sigint);
905
  sigint_token =
906
    create_async_signal_handler (async_request_quit, NULL);
907
  signal (SIGTERM, handle_sigterm);
908
 
909
  /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
910
     to the inferior and breakpoints will be ignored.  */
911
#ifdef SIGTRAP
912
  signal (SIGTRAP, SIG_DFL);
913
#endif
914
 
915
#ifdef SIGQUIT
916
  /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
917
     passed to the inferior, which we don't want.  It would be
918
     possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
919
     on BSD4.3 systems using vfork, that can affect the
920
     GDB process as well as the inferior (the signal handling tables
921
     might be in memory, shared between the two).  Since we establish
922
     a handler for SIGQUIT, when we call exec it will set the signal
923
     to SIG_DFL for us.  */
924
  signal (SIGQUIT, handle_sigquit);
925
  sigquit_token =
926
    create_async_signal_handler (async_do_nothing, NULL);
927
#endif
928
#ifdef SIGHUP
929
  if (signal (SIGHUP, handle_sighup) != SIG_IGN)
930
    sighup_token =
931
      create_async_signal_handler (async_disconnect, NULL);
932
  else
933
    sighup_token =
934
      create_async_signal_handler (async_do_nothing, NULL);
935
#endif
936
  signal (SIGFPE, handle_sigfpe);
937
  sigfpe_token =
938
    create_async_signal_handler (async_float_handler, NULL);
939
 
940
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
941
  signal (SIGWINCH, handle_sigwinch);
942
  sigwinch_token =
943
    create_async_signal_handler (SIGWINCH_HANDLER, NULL);
944
#endif
945
#ifdef STOP_SIGNAL
946
  sigtstp_token =
947
    create_async_signal_handler (async_stop_sig, NULL);
948
#endif
949
 
950
}
951
 
952
void
953
mark_async_signal_handler_wrapper (void *token)
954
{
955
  mark_async_signal_handler ((struct async_signal_handler *) token);
956
}
957
 
958
/* Tell the event loop what to do if SIGINT is received.
959
   See event-signal.c. */
960
void
961
handle_sigint (int sig)
962
{
963
  signal (sig, handle_sigint);
964
 
965
  /* We could be running in a loop reading in symfiles or something so
966
     it may be quite a while before we get back to the event loop.  So
967
     set quit_flag to 1 here. Then if QUIT is called before we get to
968
     the event loop, we will unwind as expected.  */
969
 
970
  quit_flag = 1;
971
 
972
  /* If immediate_quit is set, we go ahead and process the SIGINT right
973
     away, even if we usually would defer this to the event loop. The
974
     assumption here is that it is safe to process ^C immediately if
975
     immediate_quit is set. If we didn't, SIGINT would be really
976
     processed only the next time through the event loop.  To get to
977
     that point, though, the command that we want to interrupt needs to
978
     finish first, which is unacceptable. */
979
  if (immediate_quit)
980
    async_request_quit (0);
981
  else
982
    /* If immediate quit is not set, we process SIGINT the next time
983
       through the loop, which is fine. */
984
    mark_async_signal_handler_wrapper (sigint_token);
985
}
986
 
987
/* Quit GDB if SIGTERM is received.
988
   GDB would quit anyway, but this way it will clean up properly.  */
989
void
990
handle_sigterm (int sig)
991
{
992
  signal (sig, handle_sigterm);
993
  quit_force ((char *) 0, stdin == instream);
994
}
995
 
996
/* Do the quit. All the checks have been done by the caller. */
997
void
998
async_request_quit (gdb_client_data arg)
999
{
1000
  /* If the quit_flag has gotten reset back to 0 by the time we get
1001
     back here, that means that an exception was thrown to unwind the
1002
     current command before we got back to the event loop.  So there
1003
     is no reason to call quit again here, unless immediate_quit is
1004
     set.*/
1005
 
1006
  if (quit_flag || immediate_quit)
1007
    quit ();
1008
}
1009
 
1010
#ifdef SIGQUIT
1011
/* Tell the event loop what to do if SIGQUIT is received.
1012
   See event-signal.c. */
1013
static void
1014
handle_sigquit (int sig)
1015
{
1016
  mark_async_signal_handler_wrapper (sigquit_token);
1017
  signal (sig, handle_sigquit);
1018
}
1019
#endif
1020
 
1021
#if defined (SIGQUIT) || defined (SIGHUP)
1022
/* Called by the event loop in response to a SIGQUIT or an
1023
   ignored SIGHUP.  */
1024
static void
1025
async_do_nothing (gdb_client_data arg)
1026
{
1027
  /* Empty function body. */
1028
}
1029
#endif
1030
 
1031
#ifdef SIGHUP
1032
/* Tell the event loop what to do if SIGHUP is received.
1033
   See event-signal.c. */
1034
static void
1035
handle_sighup (int sig)
1036
{
1037
  mark_async_signal_handler_wrapper (sighup_token);
1038
  signal (sig, handle_sighup);
1039
}
1040
 
1041
/* Called by the event loop to process a SIGHUP */
1042
static void
1043
async_disconnect (gdb_client_data arg)
1044
{
1045
  catch_errors (quit_cover, NULL,
1046
                "Could not kill the program being debugged",
1047
                RETURN_MASK_ALL);
1048
  signal (SIGHUP, SIG_DFL);     /*FIXME: ??????????? */
1049
  kill (getpid (), SIGHUP);
1050
}
1051
#endif
1052
 
1053
#ifdef STOP_SIGNAL
1054
void
1055
handle_stop_sig (int sig)
1056
{
1057
  mark_async_signal_handler_wrapper (sigtstp_token);
1058
  signal (sig, handle_stop_sig);
1059
}
1060
 
1061
static void
1062
async_stop_sig (gdb_client_data arg)
1063
{
1064
  char *prompt = get_prompt ();
1065
#if STOP_SIGNAL == SIGTSTP
1066
  signal (SIGTSTP, SIG_DFL);
1067
#if HAVE_SIGPROCMASK
1068
  {
1069
    sigset_t zero;
1070
 
1071
    sigemptyset (&zero);
1072
    sigprocmask (SIG_SETMASK, &zero, 0);
1073
  }
1074
#elif HAVE_SIGSETMASK
1075
  sigsetmask (0);
1076
#endif
1077
  kill (getpid (), SIGTSTP);
1078
  signal (SIGTSTP, handle_stop_sig);
1079
#else
1080
  signal (STOP_SIGNAL, handle_stop_sig);
1081
#endif
1082
  printf_unfiltered ("%s", prompt);
1083
  gdb_flush (gdb_stdout);
1084
 
1085
  /* Forget about any previous command -- null line now will do nothing.  */
1086
  dont_repeat ();
1087
}
1088
#endif /* STOP_SIGNAL */
1089
 
1090
/* Tell the event loop what to do if SIGFPE is received.
1091
   See event-signal.c. */
1092
static void
1093
handle_sigfpe (int sig)
1094
{
1095
  mark_async_signal_handler_wrapper (sigfpe_token);
1096
  signal (sig, handle_sigfpe);
1097
}
1098
 
1099
/* Event loop will call this functin to process a SIGFPE. */
1100
static void
1101
async_float_handler (gdb_client_data arg)
1102
{
1103
  /* This message is based on ANSI C, section 4.7. Note that integer
1104
     divide by zero causes this, so "float" is a misnomer. */
1105
  error (_("Erroneous arithmetic operation."));
1106
}
1107
 
1108
/* Tell the event loop what to do if SIGWINCH is received.
1109
   See event-signal.c. */
1110
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1111
static void
1112
handle_sigwinch (int sig)
1113
{
1114
  mark_async_signal_handler_wrapper (sigwinch_token);
1115
  signal (sig, handle_sigwinch);
1116
}
1117
#endif
1118
 
1119
 
1120
/* Called by do_setshow_command.  */
1121
void
1122
set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c)
1123
{
1124
  change_line_handler ();
1125
}
1126
 
1127
/* Called by do_setshow_command.  */
1128
void
1129
set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c)
1130
{
1131
  change_annotation_level ();
1132
}
1133
 
1134
/* Called by do_setshow_command.  */
1135
void
1136
set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
1137
{
1138
  PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt));
1139
}
1140
 
1141
/* Set things up for readline to be invoked via the alternate
1142
   interface, i.e. via a callback function (rl_callback_read_char),
1143
   and hook up instream to the event loop. */
1144
void
1145
gdb_setup_readline (void)
1146
{
1147
  /* This function is a noop for the sync case.  The assumption is
1148
     that the sync setup is ALL done in gdb_init, and we would only
1149
     mess it up here.  The sync stuff should really go away over
1150
     time.  */
1151
  extern int batch_silent;
1152
 
1153
  if (!batch_silent)
1154
    gdb_stdout = stdio_fileopen (stdout);
1155
  gdb_stderr = stdio_fileopen (stderr);
1156
  gdb_stdlog = gdb_stderr;  /* for moment */
1157
  gdb_stdtarg = gdb_stderr; /* for moment */
1158
 
1159
  /* If the input stream is connected to a terminal, turn on
1160
     editing.  */
1161
  if (ISATTY (instream))
1162
    {
1163
      /* Tell gdb that we will be using the readline library. This
1164
         could be overwritten by a command in .gdbinit like 'set
1165
         editing on' or 'off'.  */
1166
      async_command_editing_p = 1;
1167
 
1168
      /* When a character is detected on instream by select or poll,
1169
         readline will be invoked via this callback function.  */
1170
      call_readline = rl_callback_read_char_wrapper;
1171
    }
1172
  else
1173
    {
1174
      async_command_editing_p = 0;
1175
      call_readline = gdb_readline2;
1176
    }
1177
 
1178
  /* When readline has read an end-of-line character, it passes the
1179
     complete line to gdb for processing. command_line_handler is the
1180
     function that does this.  */
1181
  input_handler = command_line_handler;
1182
 
1183
  /* Tell readline to use the same input stream that gdb uses. */
1184
  rl_instream = instream;
1185
 
1186
  /* Get a file descriptor for the input stream, so that we can
1187
     register it with the event loop.  */
1188
  input_fd = fileno (instream);
1189
 
1190
  /* Now we need to create the event sources for the input file
1191
     descriptor.  */
1192
  /* At this point in time, this is the only event source that we
1193
     register with the even loop. Another source is going to be the
1194
     target program (inferior), but that must be registered only when
1195
     it actually exists (I.e. after we say 'run' or after we connect
1196
     to a remote target.  */
1197
  add_file_handler (input_fd, stdin_event_handler, 0);
1198
}
1199
 
1200
/* Disable command input through the standard CLI channels.  Used in
1201
   the suspend proc for interpreters that use the standard gdb readline
1202
   interface, like the cli & the mi.  */
1203
void
1204
gdb_disable_readline (void)
1205
{
1206
  /* FIXME - It is too heavyweight to delete and remake these every
1207
     time you run an interpreter that needs readline.  It is probably
1208
     better to have the interpreters cache these, which in turn means
1209
     that this needs to be moved into interpreter specific code.  */
1210
 
1211
#if 0
1212
  ui_file_delete (gdb_stdout);
1213
  ui_file_delete (gdb_stderr);
1214
  gdb_stdlog = NULL;
1215
  gdb_stdtarg = NULL;
1216
#endif
1217
 
1218
  rl_callback_handler_remove ();
1219
  delete_file_handler (input_fd);
1220
}

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