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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [event-top.c] - Blame information for rev 816

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1 227 jeremybenn
/* Top level stuff for GDB, the GNU debugger.
2
 
3
   Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009, 2010
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
#include "main.h"
35
#include "gdbthread.h"
36
 
37
/* For dont_repeat() */
38
#include "gdbcmd.h"
39
 
40
/* readline include files */
41
#include "readline/readline.h"
42
#include "readline/history.h"
43
 
44
/* readline defines this.  */
45
#undef savestring
46
 
47
static void rl_callback_read_char_wrapper (gdb_client_data client_data);
48
static void command_line_handler (char *rl);
49
static void change_line_handler (void);
50
static void change_annotation_level (void);
51
static void command_handler (char *command);
52
 
53
/* Signal handlers. */
54
#ifdef SIGQUIT
55
static void handle_sigquit (int sig);
56
#endif
57
#ifdef SIGHUP
58
static void handle_sighup (int sig);
59
#endif
60
static void handle_sigfpe (int sig);
61
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
62
static void handle_sigwinch (int sig);
63
#endif
64
 
65
/* Functions to be invoked by the event loop in response to
66
   signals. */
67
#if defined (SIGQUIT) || defined (SIGHUP)
68
static void async_do_nothing (gdb_client_data);
69
#endif
70
#ifdef SIGHUP
71
static void async_disconnect (gdb_client_data);
72
#endif
73
static void async_float_handler (gdb_client_data);
74
#ifdef STOP_SIGNAL
75
static void async_stop_sig (gdb_client_data);
76
#endif
77
 
78
/* Readline offers an alternate interface, via callback
79
   functions. These are all included in the file callback.c in the
80
   readline distribution.  This file provides (mainly) a function, which
81
   the event loop uses as callback (i.e. event handler) whenever an event
82
   is detected on the standard input file descriptor.
83
   readline_callback_read_char is called (by the GDB event loop) whenever
84
   there is a new character ready on the input stream. This function
85
   incrementally builds a buffer internal to readline where it
86
   accumulates the line read up to the point of invocation.  In the
87
   special case in which the character read is newline, the function
88
   invokes a GDB supplied callback routine, which does the processing of
89
   a full command line.  This latter routine is the asynchronous analog
90
   of the old command_line_input in gdb. Instead of invoking (and waiting
91
   for) readline to read the command line and pass it back to
92
   command_loop for processing, the new command_line_handler function has
93
   the command line already available as its parameter.  INPUT_HANDLER is
94
   to be set to the function that readline will invoke when a complete
95
   line of input is ready.  CALL_READLINE is to be set to the function
96
   that readline offers as callback to the event_loop. */
97
 
98
void (*input_handler) (char *);
99
void (*call_readline) (gdb_client_data);
100
 
101
/* Important variables for the event loop. */
102
 
103
/* This is used to determine if GDB is using the readline library or
104
   its own simplified form of readline. It is used by the asynchronous
105
   form of the set editing command.
106
   ezannoni: as of 1999-04-29 I expect that this
107
   variable will not be used after gdb is changed to use the event
108
   loop as default engine, and event-top.c is merged into top.c. */
109
int async_command_editing_p;
110
 
111
/* This variable contains the new prompt that the user sets with the
112
   set prompt command. */
113
char *new_async_prompt;
114
 
115
/* This is the annotation suffix that will be used when the
116
   annotation_level is 2. */
117
char *async_annotation_suffix;
118
 
119
/* This is used to display the notification of the completion of an
120
   asynchronous execution command. */
121
int exec_done_display_p = 0;
122
 
123
/* This is the file descriptor for the input stream that GDB uses to
124
   read commands from. */
125
int input_fd;
126
 
127
/* This is the prompt stack. Prompts will be pushed on the stack as
128
   needed by the different 'kinds' of user inputs GDB is asking
129
   for. See event-loop.h. */
130
struct prompts the_prompts;
131
 
132
/* signal handling variables */
133
/* Each of these is a pointer to a function that the event loop will
134
   invoke if the corresponding signal has received. The real signal
135
   handlers mark these functions as ready to be executed and the event
136
   loop, in a later iteration, calls them. See the function
137
   invoke_async_signal_handler. */
138
void *sigint_token;
139
#ifdef SIGHUP
140
void *sighup_token;
141
#endif
142
#ifdef SIGQUIT
143
void *sigquit_token;
144
#endif
145
void *sigfpe_token;
146
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
147
void *sigwinch_token;
148
#endif
149
#ifdef STOP_SIGNAL
150
void *sigtstp_token;
151
#endif
152
 
153
/* Structure to save a partially entered command.  This is used when
154
   the user types '\' at the end of a command line. This is necessary
155
   because each line of input is handled by a different call to
156
   command_line_handler, and normally there is no state retained
157
   between different calls. */
158
int more_to_come = 0;
159
 
160
struct readline_input_state
161
  {
162
    char *linebuffer;
163
    char *linebuffer_ptr;
164
  }
165
readline_input_state;
166
 
167
/* This hook is called by rl_callback_read_char_wrapper after each
168
   character is processed.  */
169
void (*after_char_processing_hook) ();
170
 
171
 
172
/* Wrapper function for calling into the readline library. The event
173
   loop expects the callback function to have a paramter, while readline
174
   expects none. */
175
static void
176
rl_callback_read_char_wrapper (gdb_client_data client_data)
177
{
178
  rl_callback_read_char ();
179
  if (after_char_processing_hook)
180
    (*after_char_processing_hook) ();
181
}
182
 
183
/* Initialize all the necessary variables, start the event loop,
184
   register readline, and stdin, start the loop. */
185
void
186
cli_command_loop (void)
187
{
188
  /* If we are using readline, set things up and display the first
189
     prompt, otherwise just print the prompt. */
190
  if (async_command_editing_p)
191
    {
192
      int length;
193
      char *a_prompt;
194
      char *gdb_prompt = get_prompt ();
195
 
196
      /* Tell readline what the prompt to display is and what function it
197
         will need to call after a whole line is read. This also displays
198
         the first prompt. */
199
      length = strlen (PREFIX (0))
200
        + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
201
      a_prompt = (char *) alloca (length);
202
      strcpy (a_prompt, PREFIX (0));
203
      strcat (a_prompt, gdb_prompt);
204
      strcat (a_prompt, SUFFIX (0));
205
      rl_callback_handler_install (a_prompt, input_handler);
206
    }
207
  else
208
    display_gdb_prompt (0);
209
 
210
  /* Now it's time to start the event loop. */
211
  start_event_loop ();
212
}
213
 
214
/* Change the function to be invoked every time there is a character
215
   ready on stdin. This is used when the user sets the editing off,
216
   therefore bypassing readline, and letting gdb handle the input
217
   itself, via gdb_readline2. Also it is used in the opposite case in
218
   which the user sets editing on again, by restoring readline
219
   handling of the input. */
220
static void
221
change_line_handler (void)
222
{
223
  /* NOTE: this operates on input_fd, not instream. If we are reading
224
     commands from a file, instream will point to the file. However in
225
     async mode, we always read commands from a file with editing
226
     off. This means that the 'set editing on/off' will have effect
227
     only on the interactive session. */
228
 
229
  if (async_command_editing_p)
230
    {
231
      /* Turn on editing by using readline. */
232
      call_readline = rl_callback_read_char_wrapper;
233
      input_handler = command_line_handler;
234
    }
235
  else
236
    {
237
      /* Turn off editing by using gdb_readline2. */
238
      rl_callback_handler_remove ();
239
      call_readline = gdb_readline2;
240
 
241
      /* Set up the command handler as well, in case we are called as
242
         first thing from .gdbinit. */
243
      input_handler = command_line_handler;
244
    }
245
}
246
 
247
/* Displays the prompt. The prompt that is displayed is the current
248
   top of the prompt stack, if the argument NEW_PROMPT is
249
   0. Otherwise, it displays whatever NEW_PROMPT is. This is used
250
   after each gdb command has completed, and in the following cases:
251
   1. when the user enters a command line which is ended by '\'
252
   indicating that the command will continue on the next line.
253
   In that case the prompt that is displayed is the empty string.
254
   2. When the user is entering 'commands' for a breakpoint, or
255
   actions for a tracepoint. In this case the prompt will be '>'
256
   3. Other????
257
   FIXME: 2. & 3. not implemented yet for async. */
258
void
259
display_gdb_prompt (char *new_prompt)
260
{
261
  int prompt_length = 0;
262
  char *gdb_prompt = get_prompt ();
263
 
264
  /* Reset the nesting depth used when trace-commands is set.  */
265
  reset_command_nest_depth ();
266
 
267
  /* Each interpreter has its own rules on displaying the command
268
     prompt.  */
269
  if (!current_interp_display_prompt_p ())
270
    return;
271
 
272
  if (sync_execution && is_running (inferior_ptid))
273
    {
274
      /* This is to trick readline into not trying to display the
275
         prompt.  Even though we display the prompt using this
276
         function, readline still tries to do its own display if we
277
         don't call rl_callback_handler_install and
278
         rl_callback_handler_remove (which readline detects because a
279
         global variable is not set). If readline did that, it could
280
         mess up gdb signal handlers for SIGINT.  Readline assumes
281
         that between calls to rl_set_signals and rl_clear_signals gdb
282
         doesn't do anything with the signal handlers. Well, that's
283
         not the case, because when the target executes we change the
284
         SIGINT signal handler. If we allowed readline to display the
285
         prompt, the signal handler change would happen exactly
286
         between the calls to the above two functions.
287
         Calling rl_callback_handler_remove(), does the job. */
288
 
289
      rl_callback_handler_remove ();
290
      return;
291
    }
292
 
293
  if (!new_prompt)
294
    {
295
      /* Just use the top of the prompt stack. */
296
      prompt_length = strlen (PREFIX (0)) +
297
        strlen (SUFFIX (0)) +
298
        strlen (gdb_prompt) + 1;
299
 
300
      new_prompt = (char *) alloca (prompt_length);
301
 
302
      /* Prefix needs to have new line at end. */
303
      strcpy (new_prompt, PREFIX (0));
304
      strcat (new_prompt, gdb_prompt);
305
      /* Suffix needs to have a new line at end and \032 \032 at
306
         beginning. */
307
      strcat (new_prompt, SUFFIX (0));
308
    }
309
 
310
  if (async_command_editing_p)
311
    {
312
      rl_callback_handler_remove ();
313
      rl_callback_handler_install (new_prompt, input_handler);
314
    }
315
  /* new_prompt at this point can be the top of the stack or the one passed in */
316
  else if (new_prompt)
317
    {
318
      /* Don't use a _filtered function here.  It causes the assumed
319
         character position to be off, since the newline we read from
320
         the user is not accounted for.  */
321
      fputs_unfiltered (new_prompt, gdb_stdout);
322
      gdb_flush (gdb_stdout);
323
    }
324
}
325
 
326
/* Used when the user requests a different annotation level, with
327
   'set annotate'. It pushes a new prompt (with prefix and suffix) on top
328
   of the prompt stack, if the annotation level desired is 2, otherwise
329
   it pops the top of the prompt stack when we want the annotation level
330
   to be the normal ones (1 or 0). */
331
static void
332
change_annotation_level (void)
333
{
334
  char *prefix, *suffix;
335
 
336
  if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0))
337
    {
338
      /* The prompt stack has not been initialized to "", we are
339
         using gdb w/o the --async switch */
340
      warning (_("Command has same effect as set annotate"));
341
      return;
342
    }
343
 
344
  if (annotation_level > 1)
345
    {
346
      if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), ""))
347
        {
348
          /* Push a new prompt if the previous annotation_level was not >1. */
349
          prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
350
          strcpy (prefix, "\n\032\032pre-");
351
          strcat (prefix, async_annotation_suffix);
352
          strcat (prefix, "\n");
353
 
354
          suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
355
          strcpy (suffix, "\n\032\032");
356
          strcat (suffix, async_annotation_suffix);
357
          strcat (suffix, "\n");
358
 
359
          push_prompt (prefix, (char *) 0, suffix);
360
        }
361
    }
362
  else
363
    {
364
      if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), ""))
365
        {
366
          /* Pop the top of the stack, we are going back to annotation < 1. */
367
          pop_prompt ();
368
        }
369
    }
370
}
371
 
372
/* Pushes a new prompt on the prompt stack. Each prompt has three
373
   parts: prefix, prompt, suffix. Usually prefix and suffix are empty
374
   strings, except when the annotation level is 2. Memory is allocated
375
   within xstrdup for the new prompt. */
376
void
377
push_prompt (char *prefix, char *prompt, char *suffix)
378
{
379
  the_prompts.top++;
380
  PREFIX (0) = xstrdup (prefix);
381
 
382
  /* Note that this function is used by the set annotate 2
383
     command. This is why we take care of saving the old prompt
384
     in case a new one is not specified. */
385
  if (prompt)
386
    PROMPT (0) = xstrdup (prompt);
387
  else
388
    PROMPT (0) = xstrdup (PROMPT (-1));
389
 
390
  SUFFIX (0) = xstrdup (suffix);
391
}
392
 
393
/* Pops the top of the prompt stack, and frees the memory allocated for it. */
394
void
395
pop_prompt (void)
396
{
397
  /* If we are not during a 'synchronous' execution command, in which
398
     case, the top prompt would be empty. */
399
  if (strcmp (PROMPT (0), ""))
400
    /* This is for the case in which the prompt is set while the
401
       annotation level is 2. The top prompt will be changed, but when
402
       we return to annotation level < 2, we want that new prompt to be
403
       in effect, until the user does another 'set prompt'. */
404
    if (strcmp (PROMPT (0), PROMPT (-1)))
405
      {
406
        xfree (PROMPT (-1));
407
        PROMPT (-1) = xstrdup (PROMPT (0));
408
      }
409
 
410
  xfree (PREFIX (0));
411
  xfree (PROMPT (0));
412
  xfree (SUFFIX (0));
413
  the_prompts.top--;
414
}
415
 
416
/* When there is an event ready on the stdin file desriptor, instead
417
   of calling readline directly throught the callback function, or
418
   instead of calling gdb_readline2, give gdb a chance to detect
419
   errors and do something. */
420
void
421
stdin_event_handler (int error, gdb_client_data client_data)
422
{
423
  if (error)
424
    {
425
      printf_unfiltered (_("error detected on stdin\n"));
426
      delete_file_handler (input_fd);
427
      discard_all_continuations ();
428
      discard_all_intermediate_continuations ();
429
      /* If stdin died, we may as well kill gdb. */
430
      quit_command ((char *) 0, stdin == instream);
431
    }
432
  else
433
    (*call_readline) (client_data);
434
}
435
 
436
/* Re-enable stdin after the end of an execution command in
437
   synchronous mode, or after an error from the target, and we aborted
438
   the exec operation. */
439
 
440
void
441
async_enable_stdin (void)
442
{
443
  if (sync_execution)
444
    {
445
      /* See NOTE in async_disable_stdin() */
446
      /* FIXME: cagney/1999-09-27: Call this before clearing
447
         sync_execution.  Current target_terminal_ours() implementations
448
         check for sync_execution before switching the terminal. */
449
      target_terminal_ours ();
450
      pop_prompt ();
451
      sync_execution = 0;
452
    }
453
}
454
 
455
/* Disable reads from stdin (the console) marking the command as
456
   synchronous. */
457
 
458
void
459
async_disable_stdin (void)
460
{
461
  if (!sync_execution)
462
    {
463
      sync_execution = 1;
464
      push_prompt ("", "", "");
465
    }
466
}
467
 
468
 
469
/* Handles a gdb command. This function is called by
470
   command_line_handler, which has processed one or more input lines
471
   into COMMAND. */
472
/* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
473
   function.  The command_loop function will be obsolete when we
474
   switch to use the event loop at every execution of gdb. */
475
static void
476
command_handler (char *command)
477
{
478
  int stdin_is_tty = ISATTY (stdin);
479
  long time_at_cmd_start;
480
#ifdef HAVE_SBRK
481
  long space_at_cmd_start = 0;
482
#endif
483
  extern int display_time;
484
  extern int display_space;
485
 
486
  quit_flag = 0;
487
  if (instream == stdin && stdin_is_tty)
488
    reinitialize_more_filter ();
489
 
490
  /* If readline returned a NULL command, it means that the
491
     connection with the terminal is gone. This happens at the
492
     end of a testsuite run, after Expect has hung up
493
     but GDB is still alive. In such a case, we just quit gdb
494
     killing the inferior program too. */
495
  if (command == 0)
496
    {
497
      printf_unfiltered ("quit\n");
498
      execute_command ("quit", stdin == instream);
499
    }
500
 
501
  time_at_cmd_start = get_run_time ();
502
 
503
  if (display_space)
504
    {
505
#ifdef HAVE_SBRK
506
      char *lim = (char *) sbrk (0);
507
      space_at_cmd_start = lim - lim_at_start;
508
#endif
509
    }
510
 
511
  execute_command (command, instream == stdin);
512
 
513
  /* Do any commands attached to breakpoint we stopped at.  */
514
  bpstat_do_actions ();
515
 
516
  if (display_time)
517
    {
518
      long cmd_time = get_run_time () - time_at_cmd_start;
519
 
520
      printf_unfiltered (_("Command execution time: %ld.%06ld\n"),
521
                         cmd_time / 1000000, cmd_time % 1000000);
522
    }
523
 
524
  if (display_space)
525
    {
526
#ifdef HAVE_SBRK
527
      char *lim = (char *) sbrk (0);
528
      long space_now = lim - lim_at_start;
529
      long space_diff = space_now - space_at_cmd_start;
530
 
531
      printf_unfiltered (_("Space used: %ld (%c%ld for this command)\n"),
532
                         space_now,
533
                         (space_diff >= 0 ? '+' : '-'),
534
                         space_diff);
535
#endif
536
    }
537
}
538
 
539
/* Handle a complete line of input. This is called by the callback
540
   mechanism within the readline library.  Deal with incomplete commands
541
   as well, by saving the partial input in a global buffer.  */
542
 
543
/* NOTE: 1999-04-30 This is the asynchronous version of the
544
   command_line_input function. command_line_input will become
545
   obsolete once we use the event loop as the default mechanism in
546
   GDB. */
547
static void
548
command_line_handler (char *rl)
549
{
550
  static char *linebuffer = 0;
551
  static unsigned linelength = 0;
552
  char *p;
553
  char *p1;
554
  extern char *line;
555
  extern int linesize;
556
  char *nline;
557
  char got_eof = 0;
558
 
559
 
560
  int repeat = (instream == stdin);
561
 
562
  if (annotation_level > 1 && instream == stdin)
563
    {
564
      printf_unfiltered (("\n\032\032post-"));
565
      puts_unfiltered (async_annotation_suffix);
566
      printf_unfiltered (("\n"));
567
    }
568
 
569
  if (linebuffer == 0)
570
    {
571
      linelength = 80;
572
      linebuffer = (char *) xmalloc (linelength);
573
    }
574
 
575
  p = linebuffer;
576
 
577
  if (more_to_come)
578
    {
579
      strcpy (linebuffer, readline_input_state.linebuffer);
580
      p = readline_input_state.linebuffer_ptr;
581
      xfree (readline_input_state.linebuffer);
582
      more_to_come = 0;
583
      pop_prompt ();
584
    }
585
 
586
#ifdef STOP_SIGNAL
587
  if (job_control)
588
    signal (STOP_SIGNAL, handle_stop_sig);
589
#endif
590
 
591
  /* Make sure that all output has been output.  Some machines may let
592
     you get away with leaving out some of the gdb_flush, but not all.  */
593
  wrap_here ("");
594
  gdb_flush (gdb_stdout);
595
  gdb_flush (gdb_stderr);
596
 
597
  if (source_file_name != NULL)
598
    ++source_line_number;
599
 
600
  /* If we are in this case, then command_handler will call quit
601
     and exit from gdb. */
602
  if (!rl || rl == (char *) EOF)
603
    {
604
      got_eof = 1;
605
      command_handler (0);
606
      return;                   /* Lint. */
607
    }
608
  if (strlen (rl) + 1 + (p - linebuffer) > linelength)
609
    {
610
      linelength = strlen (rl) + 1 + (p - linebuffer);
611
      nline = (char *) xrealloc (linebuffer, linelength);
612
      p += nline - linebuffer;
613
      linebuffer = nline;
614
    }
615
  p1 = rl;
616
  /* Copy line.  Don't copy null at end.  (Leaves line alone
617
     if this was just a newline)  */
618
  while (*p1)
619
    *p++ = *p1++;
620
 
621
  xfree (rl);                   /* Allocated in readline.  */
622
 
623
  if (p > linebuffer && *(p - 1) == '\\')
624
    {
625
      *p = '\0';
626
      p--;                      /* Put on top of '\'.  */
627
 
628
      readline_input_state.linebuffer = xstrdup (linebuffer);
629
      readline_input_state.linebuffer_ptr = p;
630
 
631
      /* We will not invoke a execute_command if there is more
632
         input expected to complete the command. So, we need to
633
         print an empty prompt here. */
634
      more_to_come = 1;
635
      push_prompt ("", "", "");
636
      display_gdb_prompt (0);
637
      return;
638
    }
639
 
640
#ifdef STOP_SIGNAL
641
  if (job_control)
642
    signal (STOP_SIGNAL, SIG_DFL);
643
#endif
644
 
645
#define SERVER_COMMAND_LENGTH 7
646
  server_command =
647
    (p - linebuffer > SERVER_COMMAND_LENGTH)
648
    && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0;
649
  if (server_command)
650
    {
651
      /* Note that we don't set `line'.  Between this and the check in
652
         dont_repeat, this insures that repeating will still do the
653
         right thing.  */
654
      *p = '\0';
655
      command_handler (linebuffer + SERVER_COMMAND_LENGTH);
656
      display_gdb_prompt (0);
657
      return;
658
    }
659
 
660
  /* Do history expansion if that is wished.  */
661
  if (history_expansion_p && instream == stdin
662
      && ISATTY (instream))
663
    {
664
      char *history_value;
665
      int expanded;
666
 
667
      *p = '\0';                /* Insert null now.  */
668
      expanded = history_expand (linebuffer, &history_value);
669
      if (expanded)
670
        {
671
          /* Print the changes.  */
672
          printf_unfiltered ("%s\n", history_value);
673
 
674
          /* If there was an error, call this function again.  */
675
          if (expanded < 0)
676
            {
677
              xfree (history_value);
678
              return;
679
            }
680
          if (strlen (history_value) > linelength)
681
            {
682
              linelength = strlen (history_value) + 1;
683
              linebuffer = (char *) xrealloc (linebuffer, linelength);
684
            }
685
          strcpy (linebuffer, history_value);
686
          p = linebuffer + strlen (linebuffer);
687
        }
688
      xfree (history_value);
689
    }
690
 
691
  /* If we just got an empty line, and that is supposed
692
     to repeat the previous command, return the value in the
693
     global buffer.  */
694
  if (repeat && p == linebuffer && *p != '\\')
695
    {
696
      command_handler (line);
697
      display_gdb_prompt (0);
698
      return;
699
    }
700
 
701
  for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
702
  if (repeat && !*p1)
703
    {
704
      command_handler (line);
705
      display_gdb_prompt (0);
706
      return;
707
    }
708
 
709
  *p = 0;
710
 
711
  /* Add line to history if appropriate.  */
712
  if (instream == stdin
713
      && ISATTY (stdin) && *linebuffer)
714
    add_history (linebuffer);
715
 
716
  /* Note: lines consisting solely of comments are added to the command
717
     history.  This is useful when you type a command, and then
718
     realize you don't want to execute it quite yet.  You can comment
719
     out the command and then later fetch it from the value history
720
     and remove the '#'.  The kill ring is probably better, but some
721
     people are in the habit of commenting things out.  */
722
  if (*p1 == '#')
723
    *p1 = '\0';                 /* Found a comment. */
724
 
725
  /* Save into global buffer if appropriate.  */
726
  if (repeat)
727
    {
728
      if (linelength > linesize)
729
        {
730
          line = xrealloc (line, linelength);
731
          linesize = linelength;
732
        }
733
      strcpy (line, linebuffer);
734
      if (!more_to_come)
735
        {
736
          command_handler (line);
737
          display_gdb_prompt (0);
738
        }
739
      return;
740
    }
741
 
742
  command_handler (linebuffer);
743
  display_gdb_prompt (0);
744
  return;
745
}
746
 
747
/* Does reading of input from terminal w/o the editing features
748
   provided by the readline library. */
749
 
750
/* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
751
   will become obsolete when the event loop is made the default
752
   execution for gdb. */
753
void
754
gdb_readline2 (gdb_client_data client_data)
755
{
756
  int c;
757
  char *result;
758
  int input_index = 0;
759
  int result_size = 80;
760
  static int done_once = 0;
761
 
762
  /* Unbuffer the input stream, so that, later on, the calls to fgetc
763
     fetch only one char at the time from the stream. The fgetc's will
764
     get up to the first newline, but there may be more chars in the
765
     stream after '\n'. If we buffer the input and fgetc drains the
766
     stream, getting stuff beyond the newline as well, a select, done
767
     afterwards will not trigger. */
768
  if (!done_once && !ISATTY (instream))
769
    {
770
      setbuf (instream, NULL);
771
      done_once = 1;
772
    }
773
 
774
  result = (char *) xmalloc (result_size);
775
 
776
  /* We still need the while loop here, even though it would seem
777
     obvious to invoke gdb_readline2 at every character entered.  If
778
     not using the readline library, the terminal is in cooked mode,
779
     which sends the characters all at once. Poll will notice that the
780
     input fd has changed state only after enter is pressed. At this
781
     point we still need to fetch all the chars entered. */
782
 
783
  while (1)
784
    {
785
      /* Read from stdin if we are executing a user defined command.
786
         This is the right thing for prompt_for_continue, at least.  */
787
      c = fgetc (instream ? instream : stdin);
788
 
789
      if (c == EOF)
790
        {
791
          if (input_index > 0)
792
            /* The last line does not end with a newline.  Return it, and
793
               if we are called again fgetc will still return EOF and
794
               we'll return NULL then.  */
795
            break;
796
          xfree (result);
797
          (*input_handler) (0);
798
          return;
799
        }
800
 
801
      if (c == '\n')
802
        {
803
          if (input_index > 0 && result[input_index - 1] == '\r')
804
            input_index--;
805
          break;
806
        }
807
 
808
      result[input_index++] = c;
809
      while (input_index >= result_size)
810
        {
811
          result_size *= 2;
812
          result = (char *) xrealloc (result, result_size);
813
        }
814
    }
815
 
816
  result[input_index++] = '\0';
817
  (*input_handler) (result);
818
}
819
 
820
 
821
/* Initialization of signal handlers and tokens.  There is a function
822
   handle_sig* for each of the signals GDB cares about. Specifically:
823
   SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH.  These
824
   functions are the actual signal handlers associated to the signals
825
   via calls to signal().  The only job for these functions is to
826
   enqueue the appropriate event/procedure with the event loop.  Such
827
   procedures are the old signal handlers. The event loop will take
828
   care of invoking the queued procedures to perform the usual tasks
829
   associated with the reception of the signal. */
830
/* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
831
   init_signals will become obsolete as we move to have to event loop
832
   as the default for gdb. */
833
void
834
async_init_signals (void)
835
{
836
  signal (SIGINT, handle_sigint);
837
  sigint_token =
838
    create_async_signal_handler (async_request_quit, NULL);
839
  signal (SIGTERM, handle_sigterm);
840
 
841
  /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
842
     to the inferior and breakpoints will be ignored.  */
843
#ifdef SIGTRAP
844
  signal (SIGTRAP, SIG_DFL);
845
#endif
846
 
847
#ifdef SIGQUIT
848
  /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
849
     passed to the inferior, which we don't want.  It would be
850
     possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
851
     on BSD4.3 systems using vfork, that can affect the
852
     GDB process as well as the inferior (the signal handling tables
853
     might be in memory, shared between the two).  Since we establish
854
     a handler for SIGQUIT, when we call exec it will set the signal
855
     to SIG_DFL for us.  */
856
  signal (SIGQUIT, handle_sigquit);
857
  sigquit_token =
858
    create_async_signal_handler (async_do_nothing, NULL);
859
#endif
860
#ifdef SIGHUP
861
  if (signal (SIGHUP, handle_sighup) != SIG_IGN)
862
    sighup_token =
863
      create_async_signal_handler (async_disconnect, NULL);
864
  else
865
    sighup_token =
866
      create_async_signal_handler (async_do_nothing, NULL);
867
#endif
868
  signal (SIGFPE, handle_sigfpe);
869
  sigfpe_token =
870
    create_async_signal_handler (async_float_handler, NULL);
871
 
872
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
873
  signal (SIGWINCH, handle_sigwinch);
874
  sigwinch_token =
875
    create_async_signal_handler (SIGWINCH_HANDLER, NULL);
876
#endif
877
#ifdef STOP_SIGNAL
878
  sigtstp_token =
879
    create_async_signal_handler (async_stop_sig, NULL);
880
#endif
881
 
882
}
883
 
884
void
885
mark_async_signal_handler_wrapper (void *token)
886
{
887
  mark_async_signal_handler ((struct async_signal_handler *) token);
888
}
889
 
890
/* Tell the event loop what to do if SIGINT is received.
891
   See event-signal.c. */
892
void
893
handle_sigint (int sig)
894
{
895
  signal (sig, handle_sigint);
896
 
897
  /* We could be running in a loop reading in symfiles or something so
898
     it may be quite a while before we get back to the event loop.  So
899
     set quit_flag to 1 here. Then if QUIT is called before we get to
900
     the event loop, we will unwind as expected.  */
901
 
902
  quit_flag = 1;
903
 
904
  /* If immediate_quit is set, we go ahead and process the SIGINT right
905
     away, even if we usually would defer this to the event loop. The
906
     assumption here is that it is safe to process ^C immediately if
907
     immediate_quit is set. If we didn't, SIGINT would be really
908
     processed only the next time through the event loop.  To get to
909
     that point, though, the command that we want to interrupt needs to
910
     finish first, which is unacceptable.  If immediate quit is not set,
911
     we process SIGINT the next time through the loop, which is fine. */
912
  gdb_call_async_signal_handler (sigint_token, immediate_quit);
913
}
914
 
915
/* Quit GDB if SIGTERM is received.
916
   GDB would quit anyway, but this way it will clean up properly.  */
917
void
918
handle_sigterm (int sig)
919
{
920
  signal (sig, handle_sigterm);
921
  quit_force ((char *) 0, stdin == instream);
922
}
923
 
924
/* Do the quit. All the checks have been done by the caller. */
925
void
926
async_request_quit (gdb_client_data arg)
927
{
928
  /* If the quit_flag has gotten reset back to 0 by the time we get
929
     back here, that means that an exception was thrown to unwind the
930
     current command before we got back to the event loop.  So there
931
     is no reason to call quit again here, unless immediate_quit is
932
     set.*/
933
 
934
  if (quit_flag || immediate_quit)
935
    quit ();
936
}
937
 
938
#ifdef SIGQUIT
939
/* Tell the event loop what to do if SIGQUIT is received.
940
   See event-signal.c. */
941
static void
942
handle_sigquit (int sig)
943
{
944
  mark_async_signal_handler_wrapper (sigquit_token);
945
  signal (sig, handle_sigquit);
946
}
947
#endif
948
 
949
#if defined (SIGQUIT) || defined (SIGHUP)
950
/* Called by the event loop in response to a SIGQUIT or an
951
   ignored SIGHUP.  */
952
static void
953
async_do_nothing (gdb_client_data arg)
954
{
955
  /* Empty function body. */
956
}
957
#endif
958
 
959
#ifdef SIGHUP
960
/* Tell the event loop what to do if SIGHUP is received.
961
   See event-signal.c. */
962
static void
963
handle_sighup (int sig)
964
{
965
  mark_async_signal_handler_wrapper (sighup_token);
966
  signal (sig, handle_sighup);
967
}
968
 
969
/* Called by the event loop to process a SIGHUP */
970
static void
971
async_disconnect (gdb_client_data arg)
972
{
973
  catch_errors (quit_cover, NULL,
974
                "Could not kill the program being debugged",
975
                RETURN_MASK_ALL);
976
  signal (SIGHUP, SIG_DFL);     /*FIXME: ??????????? */
977
  raise (SIGHUP);
978
}
979
#endif
980
 
981
#ifdef STOP_SIGNAL
982
void
983
handle_stop_sig (int sig)
984
{
985
  mark_async_signal_handler_wrapper (sigtstp_token);
986
  signal (sig, handle_stop_sig);
987
}
988
 
989
static void
990
async_stop_sig (gdb_client_data arg)
991
{
992
  char *prompt = get_prompt ();
993
#if STOP_SIGNAL == SIGTSTP
994
  signal (SIGTSTP, SIG_DFL);
995
#if HAVE_SIGPROCMASK
996
  {
997
    sigset_t zero;
998
 
999
    sigemptyset (&zero);
1000
    sigprocmask (SIG_SETMASK, &zero, 0);
1001
  }
1002
#elif HAVE_SIGSETMASK
1003
  sigsetmask (0);
1004
#endif
1005
  raise (SIGTSTP);
1006
  signal (SIGTSTP, handle_stop_sig);
1007
#else
1008
  signal (STOP_SIGNAL, handle_stop_sig);
1009
#endif
1010
  printf_unfiltered ("%s", prompt);
1011
  gdb_flush (gdb_stdout);
1012
 
1013
  /* Forget about any previous command -- null line now will do nothing.  */
1014
  dont_repeat ();
1015
}
1016
#endif /* STOP_SIGNAL */
1017
 
1018
/* Tell the event loop what to do if SIGFPE is received.
1019
   See event-signal.c. */
1020
static void
1021
handle_sigfpe (int sig)
1022
{
1023
  mark_async_signal_handler_wrapper (sigfpe_token);
1024
  signal (sig, handle_sigfpe);
1025
}
1026
 
1027
/* Event loop will call this functin to process a SIGFPE. */
1028
static void
1029
async_float_handler (gdb_client_data arg)
1030
{
1031
  /* This message is based on ANSI C, section 4.7. Note that integer
1032
     divide by zero causes this, so "float" is a misnomer. */
1033
  error (_("Erroneous arithmetic operation."));
1034
}
1035
 
1036
/* Tell the event loop what to do if SIGWINCH is received.
1037
   See event-signal.c. */
1038
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
1039
static void
1040
handle_sigwinch (int sig)
1041
{
1042
  mark_async_signal_handler_wrapper (sigwinch_token);
1043
  signal (sig, handle_sigwinch);
1044
}
1045
#endif
1046
 
1047
 
1048
/* Called by do_setshow_command.  */
1049
void
1050
set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c)
1051
{
1052
  change_line_handler ();
1053
}
1054
 
1055
/* Called by do_setshow_command.  */
1056
void
1057
set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c)
1058
{
1059
  change_annotation_level ();
1060
}
1061
 
1062
/* Called by do_setshow_command.  */
1063
void
1064
set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
1065
{
1066
  PROMPT (0) = xstrdup (new_async_prompt);
1067
}
1068
 
1069
/* Set things up for readline to be invoked via the alternate
1070
   interface, i.e. via a callback function (rl_callback_read_char),
1071
   and hook up instream to the event loop. */
1072
void
1073
gdb_setup_readline (void)
1074
{
1075
  /* This function is a noop for the sync case.  The assumption is
1076
     that the sync setup is ALL done in gdb_init, and we would only
1077
     mess it up here.  The sync stuff should really go away over
1078
     time.  */
1079
  if (!batch_silent)
1080
    gdb_stdout = stdio_fileopen (stdout);
1081
  gdb_stderr = stdio_fileopen (stderr);
1082
  gdb_stdlog = gdb_stderr;  /* for moment */
1083
  gdb_stdtarg = gdb_stderr; /* for moment */
1084
 
1085
  /* If the input stream is connected to a terminal, turn on
1086
     editing.  */
1087
  if (ISATTY (instream))
1088
    {
1089
      /* Tell gdb that we will be using the readline library. This
1090
         could be overwritten by a command in .gdbinit like 'set
1091
         editing on' or 'off'.  */
1092
      async_command_editing_p = 1;
1093
 
1094
      /* When a character is detected on instream by select or poll,
1095
         readline will be invoked via this callback function.  */
1096
      call_readline = rl_callback_read_char_wrapper;
1097
    }
1098
  else
1099
    {
1100
      async_command_editing_p = 0;
1101
      call_readline = gdb_readline2;
1102
    }
1103
 
1104
  /* When readline has read an end-of-line character, it passes the
1105
     complete line to gdb for processing. command_line_handler is the
1106
     function that does this.  */
1107
  input_handler = command_line_handler;
1108
 
1109
  /* Tell readline to use the same input stream that gdb uses. */
1110
  rl_instream = instream;
1111
 
1112
  /* Get a file descriptor for the input stream, so that we can
1113
     register it with the event loop.  */
1114
  input_fd = fileno (instream);
1115
 
1116
  /* Now we need to create the event sources for the input file
1117
     descriptor.  */
1118
  /* At this point in time, this is the only event source that we
1119
     register with the even loop. Another source is going to be the
1120
     target program (inferior), but that must be registered only when
1121
     it actually exists (I.e. after we say 'run' or after we connect
1122
     to a remote target.  */
1123
  add_file_handler (input_fd, stdin_event_handler, 0);
1124
}
1125
 
1126
/* Disable command input through the standard CLI channels.  Used in
1127
   the suspend proc for interpreters that use the standard gdb readline
1128
   interface, like the cli & the mi.  */
1129
void
1130
gdb_disable_readline (void)
1131
{
1132
  /* FIXME - It is too heavyweight to delete and remake these every
1133
     time you run an interpreter that needs readline.  It is probably
1134
     better to have the interpreters cache these, which in turn means
1135
     that this needs to be moved into interpreter specific code.  */
1136
 
1137
#if 0
1138
  ui_file_delete (gdb_stdout);
1139
  ui_file_delete (gdb_stderr);
1140
  gdb_stdlog = NULL;
1141
  gdb_stdtarg = NULL;
1142
#endif
1143
 
1144
  rl_callback_handler_remove ();
1145
  delete_file_handler (input_fd);
1146
}

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