Bug Summary

File:src/gnu/usr.bin/binutils/gdb/event-top.c
Warning:line 662, column 7
Value stored to 'got_eof' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name event-top.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/binutils/obj/gdb -resource-dir /usr/local/lib/clang/13.0.0 -D PIE_DEFAULT=1 -I . -I /usr/src/gnu/usr.bin/binutils/gdb -I /usr/src/gnu/usr.bin/binutils/gdb/config -D LOCALEDIR="/usr/share/locale" -D HAVE_CONFIG_H -I /usr/src/gnu/usr.bin/binutils/gdb/../include/opcode -I ../bfd -I /usr/src/gnu/usr.bin/binutils/gdb/../bfd -I /usr/src/gnu/usr.bin/binutils/gdb/../include -I ../intl -I /usr/src/gnu/usr.bin/binutils/gdb/../intl -D MI_OUT=1 -D TUI=1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/gnu/usr.bin/binutils/obj/gdb -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -fcommon -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/gnu/usr.bin/binutils/gdb/event-top.c
1/* Top level stuff for GDB, the GNU debugger.
2 Copyright 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
3 Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22#include "defs.h"
23#include "top.h"
24#include "inferior.h"
25#include "target.h"
26#include "terminal.h" /* for job_control */
27#include "event-loop.h"
28#include "event-top.h"
29#include "interps.h"
30#include <signal.h>
31
32/* For dont_repeat() */
33#include "gdbcmd.h"
34
35/* readline include files */
36#include "readline/readline.h"
37#include "readline/history.h"
38
39/* readline defines this. */
40#undef savestring
41
42static void rl_callback_read_char_wrapper (gdb_client_data client_data);
43static void command_line_handler (char *rl);
44static void command_line_handler_continuation (struct continuation_arg *arg);
45static void change_line_handler (void);
46static void change_annotation_level (void);
47static void command_handler (char *command);
48static void async_do_nothing (gdb_client_data arg);
49static void async_disconnect (gdb_client_data arg);
50static void async_stop_sig (gdb_client_data arg);
51static void async_float_handler (gdb_client_data arg);
52
53/* Signal handlers. */
54static void handle_sigquit (int sig);
55static void handle_sighup (int sig);
56static void handle_sigfpe (int sig);
57#if defined(SIGWINCH28) && defined(SIGWINCH_HANDLER)
58static void handle_sigwinch (int sig);
59#endif
60
61/* Functions to be invoked by the event loop in response to
62 signals. */
63static void async_do_nothing (gdb_client_data);
64static void async_disconnect (gdb_client_data);
65static void async_float_handler (gdb_client_data);
66static void async_stop_sig (gdb_client_data);
67
68/* Readline offers an alternate interface, via callback
69 functions. These are all included in the file callback.c in the
70 readline distribution. This file provides (mainly) a function, which
71 the event loop uses as callback (i.e. event handler) whenever an event
72 is detected on the standard input file descriptor.
73 readline_callback_read_char is called (by the GDB event loop) whenever
74 there is a new character ready on the input stream. This function
75 incrementally builds a buffer internal to readline where it
76 accumulates the line read up to the point of invocation. In the
77 special case in which the character read is newline, the function
78 invokes a GDB supplied callback routine, which does the processing of
79 a full command line. This latter routine is the asynchronous analog
80 of the old command_line_input in gdb. Instead of invoking (and waiting
81 for) readline to read the command line and pass it back to
82 command_loop for processing, the new command_line_handler function has
83 the command line already available as its parameter. INPUT_HANDLER is
84 to be set to the function that readline will invoke when a complete
85 line of input is ready. CALL_READLINE is to be set to the function
86 that readline offers as callback to the event_loop. */
87
88void (*input_handler) (char *);
89void (*call_readline) (gdb_client_data);
90
91/* Important variables for the event loop. */
92
93/* This is used to determine if GDB is using the readline library or
94 its own simplified form of readline. It is used by the asynchronous
95 form of the set editing command.
96 ezannoni: as of 1999-04-29 I expect that this
97 variable will not be used after gdb is changed to use the event
98 loop as default engine, and event-top.c is merged into top.c. */
99int async_command_editing_p;
100
101/* This variable contains the new prompt that the user sets with the
102 set prompt command. */
103char *new_async_prompt;
104
105/* This is the annotation suffix that will be used when the
106 annotation_level is 2. */
107char *async_annotation_suffix;
108
109/* This is used to display the notification of the completion of an
110 asynchronous execution command. */
111int exec_done_display_p = 0;
112
113/* This is the file descriptor for the input stream that GDB uses to
114 read commands from. */
115int input_fd;
116
117/* This is the prompt stack. Prompts will be pushed on the stack as
118 needed by the different 'kinds' of user inputs GDB is asking
119 for. See event-loop.h. */
120struct prompts the_prompts;
121
122/* signal handling variables */
123/* Each of these is a pointer to a function that the event loop will
124 invoke if the corresponding signal has received. The real signal
125 handlers mark these functions as ready to be executed and the event
126 loop, in a later iteration, calls them. See the function
127 invoke_async_signal_handler. */
128void *sigint_token;
129#ifdef SIGHUP1
130void *sighup_token;
131#endif
132void *sigquit_token;
133void *sigfpe_token;
134#if defined(SIGWINCH28) && defined(SIGWINCH_HANDLER)
135void *sigwinch_token;
136#endif
137#ifdef STOP_SIGNAL18
138void *sigtstp_token;
139#endif
140
141/* Structure to save a partially entered command. This is used when
142 the user types '\' at the end of a command line. This is necessary
143 because each line of input is handled by a different call to
144 command_line_handler, and normally there is no state retained
145 between different calls. */
146int more_to_come = 0;
147
148struct readline_input_state
149 {
150 char *linebuffer;
151 char *linebuffer_ptr;
152 }
153readline_input_state;
154
155/* This hook is called by rl_callback_read_char_wrapper after each
156 character is processed. */
157void (*after_char_processing_hook) ();
158
159
160/* Wrapper function for calling into the readline library. The event
161 loop expects the callback function to have a paramter, while readline
162 expects none. */
163static void
164rl_callback_read_char_wrapper (gdb_client_data client_data)
165{
166 rl_callback_read_char ();
167 if (after_char_processing_hook)
168 (*after_char_processing_hook) ();
169}
170
171/* Initialize all the necessary variables, start the event loop,
172 register readline, and stdin, start the loop. */
173void
174cli_command_loop (void)
175{
176 int length;
177 char *a_prompt;
178 char *gdb_prompt = get_prompt ();
179
180 /* If we are using readline, set things up and display the first
181 prompt, otherwise just print the prompt. */
182 if (async_command_editing_p)
183 {
184 /* Tell readline what the prompt to display is and what function it
185 will need to call after a whole line is read. This also displays
186 the first prompt. */
187 length = strlen (PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix) + strlen (gdb_prompt) + strlen (SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix) + 1;
188 a_prompt = (char *) xmalloc (length);
189 strcpy (a_prompt, PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix);
190 strcat (a_prompt, gdb_prompt);
191 strcat (a_prompt, SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix);
192 rl_callback_handler_install (a_prompt, input_handler);
193 }
194 else
195 display_gdb_prompt (0);
196
197 /* Now it's time to start the event loop. */
198 start_event_loop ();
199}
200
201/* Change the function to be invoked every time there is a character
202 ready on stdin. This is used when the user sets the editing off,
203 therefore bypassing readline, and letting gdb handle the input
204 itself, via gdb_readline2. Also it is used in the opposite case in
205 which the user sets editing on again, by restoring readline
206 handling of the input. */
207static void
208change_line_handler (void)
209{
210 /* NOTE: this operates on input_fd, not instream. If we are reading
211 commands from a file, instream will point to the file. However in
212 async mode, we always read commands from a file with editing
213 off. This means that the 'set editing on/off' will have effect
214 only on the interactive session. */
215
216 if (async_command_editing_p)
217 {
218 /* Turn on editing by using readline. */
219 call_readline = rl_callback_read_char_wrapper;
220 input_handler = command_line_handler;
221 }
222 else
223 {
224 /* Turn off editing by using gdb_readline2. */
225 rl_callback_handler_remove ();
226 call_readline = gdb_readline2;
227
228 /* Set up the command handler as well, in case we are called as
229 first thing from .gdbinit. */
230 input_handler = command_line_handler;
231 }
232}
233
234/* Displays the prompt. The prompt that is displayed is the current
235 top of the prompt stack, if the argument NEW_PROMPT is
236 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
237 after each gdb command has completed, and in the following cases:
238 1. when the user enters a command line which is ended by '\'
239 indicating that the command will continue on the next line.
240 In that case the prompt that is displayed is the empty string.
241 2. When the user is entering 'commands' for a breakpoint, or
242 actions for a tracepoint. In this case the prompt will be '>'
243 3. Other????
244 FIXME: 2. & 3. not implemented yet for async. */
245void
246display_gdb_prompt (char *new_prompt)
247{
248 int prompt_length = 0;
249 char *gdb_prompt = get_prompt ();
250
251 /* Each interpreter has its own rules on displaying the command
252 prompt. */
253 if (!current_interp_display_prompt_p ())
254 return;
255
256 if (target_executing && sync_execution)
257 {
258 /* This is to trick readline into not trying to display the
259 prompt. Even though we display the prompt using this
260 function, readline still tries to do its own display if we
261 don't call rl_callback_handler_install and
262 rl_callback_handler_remove (which readline detects because a
263 global variable is not set). If readline did that, it could
264 mess up gdb signal handlers for SIGINT. Readline assumes
265 that between calls to rl_set_signals and rl_clear_signals gdb
266 doesn't do anything with the signal handlers. Well, that's
267 not the case, because when the target executes we change the
268 SIGINT signal handler. If we allowed readline to display the
269 prompt, the signal handler change would happen exactly
270 between the calls to the above two functions.
271 Calling rl_callback_handler_remove(), does the job. */
272
273 rl_callback_handler_remove ();
274 return;
275 }
276
277 if (!new_prompt)
278 {
279 /* Just use the top of the prompt stack. */
280 prompt_length = strlen (PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix) +
281 strlen (SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix) +
282 strlen (gdb_prompt) + 1;
283
284 new_prompt = (char *) alloca (prompt_length)__builtin_alloca(prompt_length);
285
286 /* Prefix needs to have new line at end. */
287 strcpy (new_prompt, PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix);
288 strcat (new_prompt, gdb_prompt);
289 /* Suffix needs to have a new line at end and \032 \032 at
290 beginning. */
291 strcat (new_prompt, SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix);
292 }
293
294 if (async_command_editing_p)
295 {
296 rl_callback_handler_remove ();
297 rl_callback_handler_install (new_prompt, input_handler);
298 }
299 /* new_prompt at this point can be the top of the stack or the one passed in */
300 else if (new_prompt)
301 {
302 /* Don't use a _filtered function here. It causes the assumed
303 character position to be off, since the newline we read from
304 the user is not accounted for. */
305 fputs_unfiltered (new_prompt, gdb_stdout);
306 gdb_flush (gdb_stdout);
307 }
308}
309
310/* Used when the user requests a different annotation level, with
311 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
312 of the prompt stack, if the annotation level desired is 2, otherwise
313 it pops the top of the prompt stack when we want the annotation level
314 to be the normal ones (1 or 0). */
315static void
316change_annotation_level (void)
317{
318 char *prefix, *suffix;
319
320 if (!PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix || !PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt || !SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix)
321 {
322 /* The prompt stack has not been initialized to "", we are
323 using gdb w/o the --async switch */
324 warning ("Command has same effect as set annotate");
325 return;
326 }
327
328 if (annotation_level > 1)
329 {
330 if (!strcmp (PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix, "") && !strcmp (SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix, ""))
331 {
332 /* Push a new prompt if the previous annotation_level was not >1. */
333 prefix = (char *) alloca (strlen (async_annotation_suffix) + 10)__builtin_alloca(strlen (async_annotation_suffix) + 10);
334 strcpy (prefix, "\n\032\032pre-");
335 strcat (prefix, async_annotation_suffix);
336 strcat (prefix, "\n");
337
338 suffix = (char *) alloca (strlen (async_annotation_suffix) + 6)__builtin_alloca(strlen (async_annotation_suffix) + 6);
339 strcpy (suffix, "\n\032\032");
340 strcat (suffix, async_annotation_suffix);
341 strcat (suffix, "\n");
342
343 push_prompt (prefix, (char *) 0, suffix);
344 }
345 }
346 else
347 {
348 if (strcmp (PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix, "") && strcmp (SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix, ""))
349 {
350 /* Pop the top of the stack, we are going back to annotation < 1. */
351 pop_prompt ();
352 }
353 }
354}
355
356/* Pushes a new prompt on the prompt stack. Each prompt has three
357 parts: prefix, prompt, suffix. Usually prefix and suffix are empty
358 strings, except when the annotation level is 2. Memory is allocated
359 within savestring for the new prompt. */
360void
361push_prompt (char *prefix, char *prompt, char *suffix)
362{
363 the_prompts.top++;
364 PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix = savestring (prefix, strlen (prefix));
365
366 /* Note that this function is used by the set annotate 2
367 command. This is why we take care of saving the old prompt
368 in case a new one is not specified. */
369 if (prompt)
370 PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt = savestring (prompt, strlen (prompt));
371 else
372 PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt = savestring (PROMPT (-1)the_prompts.prompt_stack[the_prompts.top + -1].prompt, strlen (PROMPT (-1)the_prompts.prompt_stack[the_prompts.top + -1].prompt));
373
374 SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix = savestring (suffix, strlen (suffix));
375}
376
377/* Pops the top of the prompt stack, and frees the memory allocated for it. */
378void
379pop_prompt (void)
380{
381 /* If we are not during a 'synchronous' execution command, in which
382 case, the top prompt would be empty. */
383 if (strcmp (PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt, ""))
384 /* This is for the case in which the prompt is set while the
385 annotation level is 2. The top prompt will be changed, but when
386 we return to annotation level < 2, we want that new prompt to be
387 in effect, until the user does another 'set prompt'. */
388 if (strcmp (PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt, PROMPT (-1)the_prompts.prompt_stack[the_prompts.top + -1].prompt))
389 {
390 xfree (PROMPT (-1)the_prompts.prompt_stack[the_prompts.top + -1].prompt);
391 PROMPT (-1)the_prompts.prompt_stack[the_prompts.top + -1].prompt = savestring (PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt, strlen (PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt));
392 }
393
394 xfree (PREFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].prefix);
395 xfree (PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt);
396 xfree (SUFFIX (0)the_prompts.prompt_stack[the_prompts.top + 0].suffix);
397 the_prompts.top--;
398}
399
400/* When there is an event ready on the stdin file desriptor, instead
401 of calling readline directly throught the callback function, or
402 instead of calling gdb_readline2, give gdb a chance to detect
403 errors and do something. */
404void
405stdin_event_handler (int error, gdb_client_data client_data)
406{
407 if (error)
408 {
409 printf_unfiltered ("error detected on stdin\n");
410 delete_file_handler (input_fd);
411 discard_all_continuations ();
412 /* If stdin died, we may as well kill gdb. */
413 quit_command ((char *) 0, stdin(&__sF[0]) == instream);
414 }
415 else
416 (*call_readline) (client_data);
417}
418
419/* Re-enable stdin after the end of an execution command in
420 synchronous mode, or after an error from the target, and we aborted
421 the exec operation. */
422
423void
424async_enable_stdin (void *dummy)
425{
426 /* See NOTE in async_disable_stdin() */
427 /* FIXME: cagney/1999-09-27: Call this before clearing
428 sync_execution. Current target_terminal_ours() implementations
429 check for sync_execution before switching the terminal. */
430 target_terminal_ours ()(*current_target.to_terminal_ours) ();
431 pop_prompt ();
432 sync_execution = 0;
433}
434
435/* Disable reads from stdin (the console) marking the command as
436 synchronous. */
437
438void
439async_disable_stdin (void)
440{
441 sync_execution = 1;
442 push_prompt ("", "", "");
443 /* FIXME: cagney/1999-09-27: At present this call is technically
444 redundant since infcmd.c and infrun.c both already call
445 target_terminal_inferior(). As the terminal handling (in
446 sync/async mode) is refined, the duplicate calls can be
447 eliminated (Here or in infcmd.c/infrun.c). */
448 target_terminal_inferior ()(*current_target.to_terminal_inferior) ();
449 /* Add the reinstate of stdin to the list of cleanups to be done
450 in case the target errors out and dies. These cleanups are also
451 done in case of normal successful termination of the execution
452 command, by complete_execution(). */
453 make_exec_error_cleanup (async_enable_stdin, NULL((void*)0));
454}
455
456
457/* Handles a gdb command. This function is called by
458 command_line_handler, which has processed one or more input lines
459 into COMMAND. */
460/* NOTE: 1999-04-30 This is the asynchronous version of the command_loop
461 function. The command_loop function will be obsolete when we
462 switch to use the event loop at every execution of gdb. */
463static void
464command_handler (char *command)
465{
466 struct cleanup *old_chain;
467 int stdin_is_tty = ISATTY (stdin)(isatty ((!__isthreaded ? (((&__sF[0]))->_file) : (fileno
)((&__sF[0])))))
;
468 struct continuation_arg *arg1;
469 struct continuation_arg *arg2;
470 long time_at_cmd_start;
471#ifdef HAVE_SBRK1
472 long space_at_cmd_start = 0;
473#endif
474 extern int display_time;
475 extern int display_space;
476
477 quit_flag = 0;
478 if (instream == stdin(&__sF[0]) && stdin_is_tty)
479 reinitialize_more_filter ();
480 old_chain = make_cleanup (null_cleanup, 0);
481
482 /* If readline returned a NULL command, it means that the
483 connection with the terminal is gone. This happens at the
484 end of a testsuite run, after Expect has hung up
485 but GDB is still alive. In such a case, we just quit gdb
486 killing the inferior program too. */
487 if (command == 0)
488 quit_command ((char *) 0, stdin(&__sF[0]) == instream);
489
490 time_at_cmd_start = get_run_time ();
491
492 if (display_space)
493 {
494#ifdef HAVE_SBRK1
495 char *lim = (char *) sbrk (0);
496 space_at_cmd_start = lim - lim_at_start;
497#endif
498 }
499
500 execute_command (command, instream == stdin(&__sF[0]));
501
502 /* Set things up for this function to be compete later, once the
503 execution has completed, if we are doing an execution command,
504 otherwise, just go ahead and finish. */
505 if (target_can_async_p ()(current_target.to_can_async_p ()) && target_executing)
506 {
507 arg1 =
508 (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
509 arg2 =
510 (struct continuation_arg *) xmalloc (sizeof (struct continuation_arg));
511 arg1->next = arg2;
512 arg2->next = NULL((void*)0);
513 arg1->data.longint = time_at_cmd_start;
514#ifdef HAVE_SBRK1
515 arg2->data.longint = space_at_cmd_start;
516#endif
517 add_continuation (command_line_handler_continuation, arg1);
518 }
519
520 /* Do any commands attached to breakpoint we stopped at. Only if we
521 are always running synchronously. Or if we have just executed a
522 command that doesn't start the target. */
523 if (!target_can_async_p ()(current_target.to_can_async_p ()) || !target_executing)
524 {
525 bpstat_do_actions (&stop_bpstat);
526 do_cleanups (old_chain);
527
528 if (display_time)
529 {
530 long cmd_time = get_run_time () - time_at_cmd_start;
531
532 printf_unfiltered ("Command execution time: %ld.%06ld\n",
533 cmd_time / 1000000, cmd_time % 1000000);
534 }
535
536 if (display_space)
537 {
538#ifdef HAVE_SBRK1
539 char *lim = (char *) sbrk (0);
540 long space_now = lim - lim_at_start;
541 long space_diff = space_now - space_at_cmd_start;
542
543 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
544 space_now,
545 (space_diff >= 0 ? '+' : '-'),
546 space_diff);
547#endif
548 }
549 }
550}
551
552/* Do any commands attached to breakpoint we stopped at. Only if we
553 are always running synchronously. Or if we have just executed a
554 command that doesn't start the target. */
555void
556command_line_handler_continuation (struct continuation_arg *arg)
557{
558 extern int display_time;
559 extern int display_space;
560
561 long time_at_cmd_start = arg->data.longint;
562 long space_at_cmd_start = arg->next->data.longint;
563
564 bpstat_do_actions (&stop_bpstat);
565 /*do_cleanups (old_chain); *//*?????FIXME????? */
566
567 if (display_time)
568 {
569 long cmd_time = get_run_time () - time_at_cmd_start;
570
571 printf_unfiltered ("Command execution time: %ld.%06ld\n",
572 cmd_time / 1000000, cmd_time % 1000000);
573 }
574 if (display_space)
575 {
576#ifdef HAVE_SBRK1
577 char *lim = (char *) sbrk (0);
578 long space_now = lim - lim_at_start;
579 long space_diff = space_now - space_at_cmd_start;
580
581 printf_unfiltered ("Space used: %ld (%c%ld for this command)\n",
582 space_now,
583 (space_diff >= 0 ? '+' : '-'),
584 space_diff);
585#endif
586 }
587}
588
589/* Handle a complete line of input. This is called by the callback
590 mechanism within the readline library. Deal with incomplete commands
591 as well, by saving the partial input in a global buffer. */
592
593/* NOTE: 1999-04-30 This is the asynchronous version of the
594 command_line_input function. command_line_input will become
595 obsolete once we use the event loop as the default mechanism in
596 GDB. */
597static void
598command_line_handler (char *rl)
599{
600 static char *linebuffer = 0;
601 static unsigned linelength = 0;
602 char *p;
603 char *p1;
604 extern char *line;
605 extern int linesize;
606 char *nline;
607 char got_eof = 0;
608
609
610 int repeat = (instream == stdin(&__sF[0]));
611
612 if (annotation_level > 1 && instream == stdin(&__sF[0]))
613 {
614 printf_unfiltered ("\n\032\032post-");
615 puts_unfiltered (async_annotation_suffix);
616 printf_unfiltered ("\n");
617 }
618
619 if (linebuffer == 0)
620 {
621 linelength = 80;
622 linebuffer = (char *) xmalloc (linelength);
623 }
624
625 p = linebuffer;
626
627 if (more_to_come)
628 {
629 strcpy (linebuffer, readline_input_state.linebuffer);
630 p = readline_input_state.linebuffer_ptr;
631 xfree (readline_input_state.linebuffer);
632 more_to_come = 0;
633 pop_prompt ();
634 }
635
636#ifdef STOP_SIGNAL18
637 if (job_control)
638 signal (STOP_SIGNAL18, handle_stop_sig);
639#endif
640
641 /* Make sure that all output has been output. Some machines may let
642 you get away with leaving out some of the gdb_flush, but not all. */
643 wrap_here ("");
644 gdb_flush (gdb_stdout);
645 gdb_flush (gdb_stderr);
646
647 if (source_file_name != NULL((void*)0))
648 {
649 ++source_line_number;
650 sprintf (source_error,
651 "%s%s:%d: Error in sourced command file:\n",
652 source_pre_error,
653 source_file_name,
654 source_line_number);
655 error_pre_print = source_error;
656 }
657
658 /* If we are in this case, then command_handler will call quit
659 and exit from gdb. */
660 if (!rl || rl == (char *) EOF(-1))
661 {
662 got_eof = 1;
Value stored to 'got_eof' is never read
663 command_handler (0);
664 }
665 if (strlen (rl) + 1 + (p - linebuffer) > linelength)
666 {
667 linelength = strlen (rl) + 1 + (p - linebuffer);
668 nline = (char *) xrealloc (linebuffer, linelength);
669 p += nline - linebuffer;
670 linebuffer = nline;
671 }
672 p1 = rl;
673 /* Copy line. Don't copy null at end. (Leaves line alone
674 if this was just a newline) */
675 while (*p1)
676 *p++ = *p1++;
677
678 xfree (rl); /* Allocated in readline. */
679
680 if (p > linebuffer && *(p - 1) == '\\')
681 {
682 p--; /* Put on top of '\'. */
683
684 readline_input_state.linebuffer = savestring (linebuffer,
685 strlen (linebuffer));
686 readline_input_state.linebuffer_ptr = p;
687
688 /* We will not invoke a execute_command if there is more
689 input expected to complete the command. So, we need to
690 print an empty prompt here. */
691 more_to_come = 1;
692 push_prompt ("", "", "");
693 display_gdb_prompt (0);
694 return;
695 }
696
697#ifdef STOP_SIGNAL18
698 if (job_control)
699 signal (STOP_SIGNAL18, SIG_DFL(void (*)(int))0);
700#endif
701
702#define SERVER_COMMAND_LENGTH7 7
703 server_command =
704 (p - linebuffer > SERVER_COMMAND_LENGTH7)
705 && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH7) == 0;
706 if (server_command)
707 {
708 /* Note that we don't set `line'. Between this and the check in
709 dont_repeat, this insures that repeating will still do the
710 right thing. */
711 *p = '\0';
712 command_handler (linebuffer + SERVER_COMMAND_LENGTH7);
713 display_gdb_prompt (0);
714 return;
715 }
716
717 /* Do history expansion if that is wished. */
718 if (history_expansion_p && instream == stdin(&__sF[0])
719 && ISATTY (instream)(isatty ((!__isthreaded ? ((instream)->_file) : (fileno)(instream
))))
)
720 {
721 char *history_value;
722 int expanded;
723
724 *p = '\0'; /* Insert null now. */
725 expanded = history_expand (linebuffer, &history_value);
726 if (expanded)
727 {
728 /* Print the changes. */
729 printf_unfiltered ("%s\n", history_value);
730
731 /* If there was an error, call this function again. */
732 if (expanded < 0)
733 {
734 xfree (history_value);
735 return;
736 }
737 if (strlen (history_value) > linelength)
738 {
739 linelength = strlen (history_value) + 1;
740 linebuffer = (char *) xrealloc (linebuffer, linelength);
741 }
742 strcpy (linebuffer, history_value);
743 p = linebuffer + strlen (linebuffer);
744 xfree (history_value);
745 }
746 }
747
748 /* If we just got an empty line, and that is supposed
749 to repeat the previous command, return the value in the
750 global buffer. */
751 if (repeat && p == linebuffer && *p != '\\')
752 {
753 command_handler (line);
754 display_gdb_prompt (0);
755 return;
756 }
757
758 for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
759 if (repeat && !*p1)
760 {
761 command_handler (line);
762 display_gdb_prompt (0);
763 return;
764 }
765
766 *p = 0;
767
768 /* Add line to history if appropriate. */
769 if (instream == stdin(&__sF[0])
770 && ISATTY (stdin)(isatty ((!__isthreaded ? (((&__sF[0]))->_file) : (fileno
)((&__sF[0])))))
&& *linebuffer)
771 add_history (linebuffer);
772
773 /* Note: lines consisting solely of comments are added to the command
774 history. This is useful when you type a command, and then
775 realize you don't want to execute it quite yet. You can comment
776 out the command and then later fetch it from the value history
777 and remove the '#'. The kill ring is probably better, but some
778 people are in the habit of commenting things out. */
779 if (*p1 == '#')
780 *p1 = '\0'; /* Found a comment. */
781
782 /* Save into global buffer if appropriate. */
783 if (repeat)
784 {
785 if (linelength > linesize)
786 {
787 line = xrealloc (line, linelength);
788 linesize = linelength;
789 }
790 strcpy (line, linebuffer);
791 if (!more_to_come)
792 {
793 command_handler (line);
794 display_gdb_prompt (0);
795 }
796 return;
797 }
798
799 command_handler (linebuffer);
800 display_gdb_prompt (0);
801 return;
802}
803
804/* Does reading of input from terminal w/o the editing features
805 provided by the readline library. */
806
807/* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline
808 will become obsolete when the event loop is made the default
809 execution for gdb. */
810void
811gdb_readline2 (gdb_client_data client_data)
812{
813 int c;
814 char *result;
815 int input_index = 0;
816 int result_size = 80;
817 static int done_once = 0;
818
819 /* Unbuffer the input stream, so that, later on, the calls to fgetc
820 fetch only one char at the time from the stream. The fgetc's will
821 get up to the first newline, but there may be more chars in the
822 stream after '\n'. If we buffer the input and fgetc drains the
823 stream, getting stuff beyond the newline as well, a select, done
824 afterwards will not trigger. */
825 if (!done_once && !ISATTY (instream)(isatty ((!__isthreaded ? ((instream)->_file) : (fileno)(instream
))))
)
826 {
827 setbuf (instream, NULL((void*)0));
828 done_once = 1;
829 }
830
831 result = (char *) xmalloc (result_size);
832
833 /* We still need the while loop here, even though it would seem
834 obvious to invoke gdb_readline2 at every character entered. If
835 not using the readline library, the terminal is in cooked mode,
836 which sends the characters all at once. Poll will notice that the
837 input fd has changed state only after enter is pressed. At this
838 point we still need to fetch all the chars entered. */
839
840 while (1)
841 {
842 /* Read from stdin if we are executing a user defined command.
843 This is the right thing for prompt_for_continue, at least. */
844 c = fgetc (instream ? instream : stdin(&__sF[0]));
845
846 if (c == EOF(-1))
847 {
848 if (input_index > 0)
849 /* The last line does not end with a newline. Return it, and
850 if we are called again fgetc will still return EOF and
851 we'll return NULL then. */
852 break;
853 xfree (result);
854 (*input_handler) (0);
855 }
856
857 if (c == '\n')
858 {
859 if (input_index > 0 && result[input_index - 1] == '\r')
860 input_index--;
861 break;
862 }
863
864 result[input_index++] = c;
865 while (input_index >= result_size)
866 {
867 result_size *= 2;
868 result = (char *) xrealloc (result, result_size);
869 }
870 }
871
872 result[input_index++] = '\0';
873 (*input_handler) (result);
874}
875
876
877/* Initialization of signal handlers and tokens. There is a function
878 handle_sig* for each of the signals GDB cares about. Specifically:
879 SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These
880 functions are the actual signal handlers associated to the signals
881 via calls to signal(). The only job for these functions is to
882 enqueue the appropriate event/procedure with the event loop. Such
883 procedures are the old signal handlers. The event loop will take
884 care of invoking the queued procedures to perform the usual tasks
885 associated with the reception of the signal. */
886/* NOTE: 1999-04-30 This is the asynchronous version of init_signals.
887 init_signals will become obsolete as we move to have to event loop
888 as the default for gdb. */
889void
890async_init_signals (void)
891{
892 signal (SIGINT2, handle_sigint);
893 sigint_token =
894 create_async_signal_handler (async_request_quit, NULL((void*)0));
895
896 /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
897 to the inferior and breakpoints will be ignored. */
898#ifdef SIGTRAP5
899 signal (SIGTRAP5, SIG_DFL(void (*)(int))0);
900#endif
901
902 /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get
903 passed to the inferior, which we don't want. It would be
904 possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but
905 on BSD4.3 systems using vfork, that can affect the
906 GDB process as well as the inferior (the signal handling tables
907 might be in memory, shared between the two). Since we establish
908 a handler for SIGQUIT, when we call exec it will set the signal
909 to SIG_DFL for us. */
910 signal (SIGQUIT3, handle_sigquit);
911 sigquit_token =
912 create_async_signal_handler (async_do_nothing, NULL((void*)0));
913#ifdef SIGHUP1
914 if (signal (SIGHUP1, handle_sighup) != SIG_IGN(void (*)(int))1)
915 sighup_token =
916 create_async_signal_handler (async_disconnect, NULL((void*)0));
917 else
918 sighup_token =
919 create_async_signal_handler (async_do_nothing, NULL((void*)0));
920#endif
921 signal (SIGFPE8, handle_sigfpe);
922 sigfpe_token =
923 create_async_signal_handler (async_float_handler, NULL((void*)0));
924
925#if defined(SIGWINCH28) && defined(SIGWINCH_HANDLER)
926 signal (SIGWINCH28, handle_sigwinch);
927 sigwinch_token =
928 create_async_signal_handler (SIGWINCH_HANDLER, NULL((void*)0));
929#endif
930#ifdef STOP_SIGNAL18
931 sigtstp_token =
932 create_async_signal_handler (async_stop_sig, NULL((void*)0));
933#endif
934
935}
936
937void
938mark_async_signal_handler_wrapper (void *token)
939{
940 mark_async_signal_handler ((struct async_signal_handler *) token);
941}
942
943/* Tell the event loop what to do if SIGINT is received.
944 See event-signal.c. */
945void
946handle_sigint (int sig)
947{
948 signal (sig, handle_sigint);
949
950 /* If immediate_quit is set, we go ahead and process the SIGINT right
951 away, even if we usually would defer this to the event loop. The
952 assumption here is that it is safe to process ^C immediately if
953 immediate_quit is set. If we didn't, SIGINT would be really
954 processed only the next time through the event loop. To get to
955 that point, though, the command that we want to interrupt needs to
956 finish first, which is unacceptable. */
957 if (immediate_quit)
958 async_request_quit (0);
959 else
960 /* If immediate quit is not set, we process SIGINT the next time
961 through the loop, which is fine. */
962 mark_async_signal_handler_wrapper (sigint_token);
963}
964
965/* Do the quit. All the checks have been done by the caller. */
966void
967async_request_quit (gdb_client_data arg)
968{
969 quit_flag = 1;
970 quit ();
971}
972
973/* Tell the event loop what to do if SIGQUIT is received.
974 See event-signal.c. */
975static void
976handle_sigquit (int sig)
977{
978 mark_async_signal_handler_wrapper (sigquit_token);
979 signal (sig, handle_sigquit);
980}
981
982/* Called by the event loop in response to a SIGQUIT. */
983static void
984async_do_nothing (gdb_client_data arg)
985{
986 /* Empty function body. */
987}
988
989#ifdef SIGHUP1
990/* Tell the event loop what to do if SIGHUP is received.
991 See event-signal.c. */
992static void
993handle_sighup (int sig)
994{
995 mark_async_signal_handler_wrapper (sighup_token);
996 signal (sig, handle_sighup);
997}
998
999/* Called by the event loop to process a SIGHUP */
1000static void
1001async_disconnect (gdb_client_data arg)
1002{
1003 catch_errors (quit_cover, NULL((void*)0),
1004 "Could not kill the program being debugged",
1005 RETURN_MASK_ALL((1 << (int)(-RETURN_QUIT)) | (1 << (int)(-RETURN_ERROR
)))
);
1006 signal (SIGHUP1, SIG_DFL(void (*)(int))0); /*FIXME: ??????????? */
1007 kill (getpid (), SIGHUP1);
1008}
1009#endif
1010
1011#ifdef STOP_SIGNAL18
1012void
1013handle_stop_sig (int sig)
1014{
1015 mark_async_signal_handler_wrapper (sigtstp_token);
1016 signal (sig, handle_stop_sig);
1017}
1018
1019static void
1020async_stop_sig (gdb_client_data arg)
1021{
1022 char *prompt = get_prompt ();
1023#if STOP_SIGNAL18 == SIGTSTP18
1024 signal (SIGTSTP18, SIG_DFL(void (*)(int))0);
1025#if HAVE_SIGPROCMASK1
1026 {
1027 sigset_t zero;
1028
1029 sigemptyset (&zero);
1030 sigprocmask (SIG_SETMASK3, &zero, 0);
1031 }
1032#elif HAVE_SIGSETMASK1
1033 sigsetmask (0);
1034#endif
1035 kill (getpid (), SIGTSTP18);
1036 signal (SIGTSTP18, handle_stop_sig);
1037#else
1038 signal (STOP_SIGNAL18, handle_stop_sig);
1039#endif
1040 printf_unfiltered ("%s", prompt);
1041 gdb_flush (gdb_stdout);
1042
1043 /* Forget about any previous command -- null line now will do nothing. */
1044 dont_repeat ();
1045}
1046#endif /* STOP_SIGNAL */
1047
1048/* Tell the event loop what to do if SIGFPE is received.
1049 See event-signal.c. */
1050static void
1051handle_sigfpe (int sig)
1052{
1053 mark_async_signal_handler_wrapper (sigfpe_token);
1054 signal (sig, handle_sigfpe);
1055}
1056
1057/* Event loop will call this functin to process a SIGFPE. */
1058static void
1059async_float_handler (gdb_client_data arg)
1060{
1061 /* This message is based on ANSI C, section 4.7. Note that integer
1062 divide by zero causes this, so "float" is a misnomer. */
1063 error ("Erroneous arithmetic operation.");
1064}
1065
1066/* Tell the event loop what to do if SIGWINCH is received.
1067 See event-signal.c. */
1068#if defined(SIGWINCH28) && defined(SIGWINCH_HANDLER)
1069static void
1070handle_sigwinch (int sig)
1071{
1072 mark_async_signal_handler_wrapper (sigwinch_token);
1073 signal (sig, handle_sigwinch);
1074}
1075#endif
1076
1077
1078/* Called by do_setshow_command. */
1079void
1080set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c)
1081{
1082 change_line_handler ();
1083}
1084
1085/* Called by do_setshow_command. */
1086void
1087set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c)
1088{
1089 change_annotation_level ();
1090}
1091
1092/* Called by do_setshow_command. */
1093void
1094set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
1095{
1096 PROMPT (0)the_prompts.prompt_stack[the_prompts.top + 0].prompt = savestring (new_async_prompt, strlen (new_async_prompt));
1097}
1098
1099/* Set things up for readline to be invoked via the alternate
1100 interface, i.e. via a callback function (rl_callback_read_char),
1101 and hook up instream to the event loop. */
1102void
1103gdb_setup_readline (void)
1104{
1105 /* This function is a noop for the sync case. The assumption is
1106 that the sync setup is ALL done in gdb_init, and we would only
1107 mess it up here. The sync stuff should really go away over
1108 time. */
1109
1110 gdb_stdout = stdio_fileopen (stdout(&__sF[1]));
1111 gdb_stderr = stdio_fileopen (stderr(&__sF[2]));
1112 gdb_stdlog = gdb_stderr; /* for moment */
1113 gdb_stdtarg = gdb_stderr; /* for moment */
1114
1115 /* If the input stream is connected to a terminal, turn on
1116 editing. */
1117 if (ISATTY (instream)(isatty ((!__isthreaded ? ((instream)->_file) : (fileno)(instream
))))
)
1118 {
1119 /* Tell gdb that we will be using the readline library. This
1120 could be overwritten by a command in .gdbinit like 'set
1121 editing on' or 'off'. */
1122 async_command_editing_p = 1;
1123
1124 /* When a character is detected on instream by select or poll,
1125 readline will be invoked via this callback function. */
1126 call_readline = rl_callback_read_char_wrapper;
1127 }
1128 else
1129 {
1130 async_command_editing_p = 0;
1131 call_readline = gdb_readline2;
1132 }
1133
1134 /* When readline has read an end-of-line character, it passes the
1135 complete line to gdb for processing. command_line_handler is the
1136 function that does this. */
1137 input_handler = command_line_handler;
1138
1139 /* Tell readline to use the same input stream that gdb uses. */
1140 rl_instream = instream;
1141
1142 /* Get a file descriptor for the input stream, so that we can
1143 register it with the event loop. */
1144 input_fd = fileno (instream)(!__isthreaded ? ((instream)->_file) : (fileno)(instream));
1145
1146 /* Now we need to create the event sources for the input file
1147 descriptor. */
1148 /* At this point in time, this is the only event source that we
1149 register with the even loop. Another source is going to be the
1150 target program (inferior), but that must be registered only when
1151 it actually exists (I.e. after we say 'run' or after we connect
1152 to a remote target. */
1153 add_file_handler (input_fd, stdin_event_handler, 0);
1154}
1155
1156/* Disable command input through the standard CLI channels. Used in
1157 the suspend proc for interpreters that use the standard gdb readline
1158 interface, like the cli & the mi. */
1159void
1160gdb_disable_readline (void)
1161{
1162 /* FIXME - It is too heavyweight to delete and remake these every
1163 time you run an interpreter that needs readline. It is probably
1164 better to have the interpreters cache these, which in turn means
1165 that this needs to be moved into interpreter specific code. */
1166
1167#if 0
1168 ui_file_delete (gdb_stdout);
1169 ui_file_delete (gdb_stderr);
1170 gdb_stdlog = NULL((void*)0);
1171 gdb_stdtarg = NULL((void*)0);
1172#endif
1173
1174 rl_callback_handler_remove ();
1175 delete_file_handler (input_fd);
1176}