| 1 | /* Top level stuff for GDB, the GNU debugger. |
| 2 | Copyright 1999, 2000, 2001, 2002 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 | |
| 42 | static void rl_callback_read_char_wrapper (gdb_client_data client_data); |
| 43 | static void command_line_handler (char *rl); |
| 44 | static void command_line_handler_continuation (struct continuation_arg *arg); |
| 45 | static void change_line_handler (void); |
| 46 | static void change_annotation_level (void); |
| 47 | static void command_handler (char *command); |
| 48 | static void async_do_nothing (gdb_client_data arg); |
| 49 | static void async_disconnect (gdb_client_data arg); |
| 50 | static void async_stop_sig (gdb_client_data arg); |
| 51 | static void async_float_handler (gdb_client_data arg); |
| 52 | |
| 53 | /* Signal handlers. */ |
| 54 | static void handle_sigquit (int sig); |
| 55 | static void handle_sighup (int sig); |
| 56 | static void handle_sigfpe (int sig); |
| 57 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
| 58 | static void handle_sigwinch (int sig); |
| 59 | #endif |
| 60 | |
| 61 | /* Functions to be invoked by the event loop in response to |
| 62 | signals. */ |
| 63 | static void async_do_nothing (gdb_client_data); |
| 64 | static void async_disconnect (gdb_client_data); |
| 65 | static void async_float_handler (gdb_client_data); |
| 66 | static 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 | |
| 88 | void (*input_handler) (char *); |
| 89 | void (*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. */ |
| 99 | int async_command_editing_p; |
| 100 | |
| 101 | /* This variable contains the new prompt that the user sets with the |
| 102 | set prompt command. */ |
| 103 | char *new_async_prompt; |
| 104 | |
| 105 | /* This is the annotation suffix that will be used when the |
| 106 | annotation_level is 2. */ |
| 107 | char *async_annotation_suffix; |
| 108 | |
| 109 | /* This is used to display the notification of the completion of an |
| 110 | asynchronous execution command. */ |
| 111 | int exec_done_display_p = 0; |
| 112 | |
| 113 | /* This is the file descriptor for the input stream that GDB uses to |
| 114 | read commands from. */ |
| 115 | int 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. */ |
| 120 | struct 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. */ |
| 128 | void *sigint_token; |
| 129 | #ifdef SIGHUP |
| 130 | void *sighup_token; |
| 131 | #endif |
| 132 | void *sigquit_token; |
| 133 | void *sigfpe_token; |
| 134 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
| 135 | void *sigwinch_token; |
| 136 | #endif |
| 137 | #ifdef STOP_SIGNAL |
| 138 | void *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. */ |
| 146 | int more_to_come = 0; |
| 147 | |
| 148 | struct readline_input_state |
| 149 | { |
| 150 | char *linebuffer; |
| 151 | char *linebuffer_ptr; |
| 152 | } |
| 153 | readline_input_state; |
| 154 | |
| 155 | /* This hook is called by rl_callback_read_char_wrapper after each |
| 156 | character is processed. */ |
| 157 | void (*after_char_processing_hook) (); |
| 158 | \f |
| 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. */ |
| 163 | static void |
| 164 | rl_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. */ |
| 173 | void |
| 174 | cli_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)) + strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1; |
| 188 | a_prompt = (char *) xmalloc (length); |
| 189 | strcpy (a_prompt, PREFIX (0)); |
| 190 | strcat (a_prompt, gdb_prompt); |
| 191 | strcat (a_prompt, SUFFIX (0)); |
| 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. */ |
| 207 | static void |
| 208 | change_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. */ |
| 245 | void |
| 246 | display_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)) + |
| 281 | strlen (SUFFIX (0)) + |
| 282 | strlen (gdb_prompt) + 1; |
| 283 | |
| 284 | new_prompt = (char *) alloca (prompt_length); |
| 285 | |
| 286 | /* Prefix needs to have new line at end. */ |
| 287 | strcpy (new_prompt, PREFIX (0)); |
| 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)); |
| 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). */ |
| 315 | static void |
| 316 | change_annotation_level (void) |
| 317 | { |
| 318 | char *prefix, *suffix; |
| 319 | |
| 320 | if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0)) |
| 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), "") && !strcmp (SUFFIX (0), "")) |
| 331 | { |
| 332 | /* Push a new prompt if the previous annotation_level was not >1. */ |
| 333 | prefix = (char *) 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); |
| 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), "") && strcmp (SUFFIX (0), "")) |
| 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. */ |
| 360 | void |
| 361 | push_prompt (char *prefix, char *prompt, char *suffix) |
| 362 | { |
| 363 | the_prompts.top++; |
| 364 | PREFIX (0) = 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) = savestring (prompt, strlen (prompt)); |
| 371 | else |
| 372 | PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1))); |
| 373 | |
| 374 | SUFFIX (0) = savestring (suffix, strlen (suffix)); |
| 375 | } |
| 376 | |
| 377 | /* Pops the top of the prompt stack, and frees the memory allocated for it. */ |
| 378 | void |
| 379 | pop_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), "")) |
| 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), PROMPT (-1))) |
| 389 | { |
| 390 | xfree (PROMPT (-1)); |
| 391 | PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0))); |
| 392 | } |
| 393 | |
| 394 | xfree (PREFIX (0)); |
| 395 | xfree (PROMPT (0)); |
| 396 | xfree (SUFFIX (0)); |
| 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. */ |
| 404 | void |
| 405 | stdin_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 == 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 | |
| 423 | void |
| 424 | async_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 (); |
| 431 | pop_prompt (); |
| 432 | sync_execution = 0; |
| 433 | } |
| 434 | |
| 435 | /* Disable reads from stdin (the console) marking the command as |
| 436 | synchronous. */ |
| 437 | |
| 438 | void |
| 439 | async_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 (); |
| 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); |
| 454 | } |
| 455 | \f |
| 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. */ |
| 463 | static void |
| 464 | command_handler (char *command) |
| 465 | { |
| 466 | struct cleanup *old_chain; |
| 467 | int stdin_is_tty = ISATTY (stdin); |
| 468 | struct continuation_arg *arg1; |
| 469 | struct continuation_arg *arg2; |
| 470 | long time_at_cmd_start; |
| 471 | #ifdef HAVE_SBRK |
| 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 && 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 == instream); |
| 489 | |
| 490 | time_at_cmd_start = get_run_time (); |
| 491 | |
| 492 | if (display_space) |
| 493 | { |
| 494 | #ifdef HAVE_SBRK |
| 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); |
| 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 () && 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; |
| 513 | arg1->data.longint = time_at_cmd_start; |
| 514 | #ifdef HAVE_SBRK |
| 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 () || !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_SBRK |
| 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. */ |
| 555 | void |
| 556 | command_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_SBRK |
| 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. */ |
| 597 | static void |
| 598 | command_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); |
| 611 | |
| 612 | if (annotation_level > 1 && instream == stdin) |
| 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_SIGNAL |
| 637 | if (job_control) |
| 638 | signal (STOP_SIGNAL, 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) |
| 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) |
| 661 | { |
| 662 | got_eof = 1; |
| 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_SIGNAL |
| 698 | if (job_control) |
| 699 | signal (STOP_SIGNAL, SIG_DFL); |
| 700 | #endif |
| 701 | |
| 702 | #define SERVER_COMMAND_LENGTH 7 |
| 703 | server_command = |
| 704 | (p - linebuffer > SERVER_COMMAND_LENGTH) |
| 705 | && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH); |
| 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_LENGTH); |
| 713 | display_gdb_prompt (0); |
| 714 | return; |
| 715 | } |
| 716 | |
| 717 | /* Do history expansion if that is wished. */ |
| 718 | if (history_expansion_p && instream == stdin |
| 719 | && ISATTY (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 |
| 770 | && ISATTY (stdin) && *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. */ |
| 810 | void |
| 811 | gdb_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)) |
| 826 | { |
| 827 | setbuf (instream, NULL); |
| 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); |
| 845 | |
| 846 | if (c == EOF) |
| 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 | #ifndef CRLF_SOURCE_FILES |
| 859 | break; |
| 860 | #else |
| 861 | { |
| 862 | if (input_index > 0 && result[input_index - 1] == '\r') |
| 863 | input_index--; |
| 864 | break; |
| 865 | } |
| 866 | #endif |
| 867 | |
| 868 | result[input_index++] = c; |
| 869 | while (input_index >= result_size) |
| 870 | { |
| 871 | result_size *= 2; |
| 872 | result = (char *) xrealloc (result, result_size); |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | result[input_index++] = '\0'; |
| 877 | (*input_handler) (result); |
| 878 | } |
| 879 | \f |
| 880 | |
| 881 | /* Initialization of signal handlers and tokens. There is a function |
| 882 | handle_sig* for each of the signals GDB cares about. Specifically: |
| 883 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
| 884 | functions are the actual signal handlers associated to the signals |
| 885 | via calls to signal(). The only job for these functions is to |
| 886 | enqueue the appropriate event/procedure with the event loop. Such |
| 887 | procedures are the old signal handlers. The event loop will take |
| 888 | care of invoking the queued procedures to perform the usual tasks |
| 889 | associated with the reception of the signal. */ |
| 890 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
| 891 | init_signals will become obsolete as we move to have to event loop |
| 892 | as the default for gdb. */ |
| 893 | void |
| 894 | async_init_signals (void) |
| 895 | { |
| 896 | signal (SIGINT, handle_sigint); |
| 897 | sigint_token = |
| 898 | create_async_signal_handler (async_request_quit, NULL); |
| 899 | |
| 900 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed |
| 901 | to the inferior and breakpoints will be ignored. */ |
| 902 | #ifdef SIGTRAP |
| 903 | signal (SIGTRAP, SIG_DFL); |
| 904 | #endif |
| 905 | |
| 906 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
| 907 | passed to the inferior, which we don't want. It would be |
| 908 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but |
| 909 | on BSD4.3 systems using vfork, that can affect the |
| 910 | GDB process as well as the inferior (the signal handling tables |
| 911 | might be in memory, shared between the two). Since we establish |
| 912 | a handler for SIGQUIT, when we call exec it will set the signal |
| 913 | to SIG_DFL for us. */ |
| 914 | signal (SIGQUIT, handle_sigquit); |
| 915 | sigquit_token = |
| 916 | create_async_signal_handler (async_do_nothing, NULL); |
| 917 | #ifdef SIGHUP |
| 918 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) |
| 919 | sighup_token = |
| 920 | create_async_signal_handler (async_disconnect, NULL); |
| 921 | else |
| 922 | sighup_token = |
| 923 | create_async_signal_handler (async_do_nothing, NULL); |
| 924 | #endif |
| 925 | signal (SIGFPE, handle_sigfpe); |
| 926 | sigfpe_token = |
| 927 | create_async_signal_handler (async_float_handler, NULL); |
| 928 | |
| 929 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
| 930 | signal (SIGWINCH, handle_sigwinch); |
| 931 | sigwinch_token = |
| 932 | create_async_signal_handler (SIGWINCH_HANDLER, NULL); |
| 933 | #endif |
| 934 | #ifdef STOP_SIGNAL |
| 935 | sigtstp_token = |
| 936 | create_async_signal_handler (async_stop_sig, NULL); |
| 937 | #endif |
| 938 | |
| 939 | } |
| 940 | |
| 941 | void |
| 942 | mark_async_signal_handler_wrapper (void *token) |
| 943 | { |
| 944 | mark_async_signal_handler ((struct async_signal_handler *) token); |
| 945 | } |
| 946 | |
| 947 | /* Tell the event loop what to do if SIGINT is received. |
| 948 | See event-signal.c. */ |
| 949 | void |
| 950 | handle_sigint (int sig) |
| 951 | { |
| 952 | signal (sig, handle_sigint); |
| 953 | |
| 954 | /* If immediate_quit is set, we go ahead and process the SIGINT right |
| 955 | away, even if we usually would defer this to the event loop. The |
| 956 | assumption here is that it is safe to process ^C immediately if |
| 957 | immediate_quit is set. If we didn't, SIGINT would be really |
| 958 | processed only the next time through the event loop. To get to |
| 959 | that point, though, the command that we want to interrupt needs to |
| 960 | finish first, which is unacceptable. */ |
| 961 | if (immediate_quit) |
| 962 | async_request_quit (0); |
| 963 | else |
| 964 | /* If immediate quit is not set, we process SIGINT the next time |
| 965 | through the loop, which is fine. */ |
| 966 | mark_async_signal_handler_wrapper (sigint_token); |
| 967 | } |
| 968 | |
| 969 | /* Do the quit. All the checks have been done by the caller. */ |
| 970 | void |
| 971 | async_request_quit (gdb_client_data arg) |
| 972 | { |
| 973 | quit_flag = 1; |
| 974 | #ifdef REQUEST_QUIT |
| 975 | REQUEST_QUIT; |
| 976 | #else |
| 977 | quit (); |
| 978 | #endif |
| 979 | } |
| 980 | |
| 981 | /* Tell the event loop what to do if SIGQUIT is received. |
| 982 | See event-signal.c. */ |
| 983 | static void |
| 984 | handle_sigquit (int sig) |
| 985 | { |
| 986 | mark_async_signal_handler_wrapper (sigquit_token); |
| 987 | signal (sig, handle_sigquit); |
| 988 | } |
| 989 | |
| 990 | /* Called by the event loop in response to a SIGQUIT. */ |
| 991 | static void |
| 992 | async_do_nothing (gdb_client_data arg) |
| 993 | { |
| 994 | /* Empty function body. */ |
| 995 | } |
| 996 | |
| 997 | #ifdef SIGHUP |
| 998 | /* Tell the event loop what to do if SIGHUP is received. |
| 999 | See event-signal.c. */ |
| 1000 | static void |
| 1001 | handle_sighup (int sig) |
| 1002 | { |
| 1003 | mark_async_signal_handler_wrapper (sighup_token); |
| 1004 | signal (sig, handle_sighup); |
| 1005 | } |
| 1006 | |
| 1007 | /* Called by the event loop to process a SIGHUP */ |
| 1008 | static void |
| 1009 | async_disconnect (gdb_client_data arg) |
| 1010 | { |
| 1011 | catch_errors (quit_cover, NULL, |
| 1012 | "Could not kill the program being debugged", |
| 1013 | RETURN_MASK_ALL); |
| 1014 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
| 1015 | kill (getpid (), SIGHUP); |
| 1016 | } |
| 1017 | #endif |
| 1018 | |
| 1019 | #ifdef STOP_SIGNAL |
| 1020 | void |
| 1021 | handle_stop_sig (int sig) |
| 1022 | { |
| 1023 | mark_async_signal_handler_wrapper (sigtstp_token); |
| 1024 | signal (sig, handle_stop_sig); |
| 1025 | } |
| 1026 | |
| 1027 | static void |
| 1028 | async_stop_sig (gdb_client_data arg) |
| 1029 | { |
| 1030 | char *prompt = get_prompt (); |
| 1031 | #if STOP_SIGNAL == SIGTSTP |
| 1032 | signal (SIGTSTP, SIG_DFL); |
| 1033 | #if HAVE_SIGPROCMASK |
| 1034 | { |
| 1035 | sigset_t zero; |
| 1036 | |
| 1037 | sigemptyset (&zero); |
| 1038 | sigprocmask (SIG_SETMASK, &zero, 0); |
| 1039 | } |
| 1040 | #elif HAVE_SIGSETMASK |
| 1041 | sigsetmask (0); |
| 1042 | #endif |
| 1043 | kill (getpid (), SIGTSTP); |
| 1044 | signal (SIGTSTP, handle_stop_sig); |
| 1045 | #else |
| 1046 | signal (STOP_SIGNAL, handle_stop_sig); |
| 1047 | #endif |
| 1048 | printf_unfiltered ("%s", prompt); |
| 1049 | gdb_flush (gdb_stdout); |
| 1050 | |
| 1051 | /* Forget about any previous command -- null line now will do nothing. */ |
| 1052 | dont_repeat (); |
| 1053 | } |
| 1054 | #endif /* STOP_SIGNAL */ |
| 1055 | |
| 1056 | /* Tell the event loop what to do if SIGFPE is received. |
| 1057 | See event-signal.c. */ |
| 1058 | static void |
| 1059 | handle_sigfpe (int sig) |
| 1060 | { |
| 1061 | mark_async_signal_handler_wrapper (sigfpe_token); |
| 1062 | signal (sig, handle_sigfpe); |
| 1063 | } |
| 1064 | |
| 1065 | /* Event loop will call this functin to process a SIGFPE. */ |
| 1066 | static void |
| 1067 | async_float_handler (gdb_client_data arg) |
| 1068 | { |
| 1069 | /* This message is based on ANSI C, section 4.7. Note that integer |
| 1070 | divide by zero causes this, so "float" is a misnomer. */ |
| 1071 | error ("Erroneous arithmetic operation."); |
| 1072 | } |
| 1073 | |
| 1074 | /* Tell the event loop what to do if SIGWINCH is received. |
| 1075 | See event-signal.c. */ |
| 1076 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
| 1077 | static void |
| 1078 | handle_sigwinch (int sig) |
| 1079 | { |
| 1080 | mark_async_signal_handler_wrapper (sigwinch_token); |
| 1081 | signal (sig, handle_sigwinch); |
| 1082 | } |
| 1083 | #endif |
| 1084 | \f |
| 1085 | |
| 1086 | /* Called by do_setshow_command. */ |
| 1087 | void |
| 1088 | set_async_editing_command (char *args, int from_tty, struct cmd_list_element *c) |
| 1089 | { |
| 1090 | change_line_handler (); |
| 1091 | } |
| 1092 | |
| 1093 | /* Called by do_setshow_command. */ |
| 1094 | void |
| 1095 | set_async_annotation_level (char *args, int from_tty, struct cmd_list_element *c) |
| 1096 | { |
| 1097 | change_annotation_level (); |
| 1098 | } |
| 1099 | |
| 1100 | /* Called by do_setshow_command. */ |
| 1101 | void |
| 1102 | set_async_prompt (char *args, int from_tty, struct cmd_list_element *c) |
| 1103 | { |
| 1104 | PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt)); |
| 1105 | } |
| 1106 | |
| 1107 | /* Set things up for readline to be invoked via the alternate |
| 1108 | interface, i.e. via a callback function (rl_callback_read_char), |
| 1109 | and hook up instream to the event loop. */ |
| 1110 | void |
| 1111 | gdb_setup_readline (void) |
| 1112 | { |
| 1113 | /* This function is a noop for the sync case. The assumption is that |
| 1114 | the sync setup is ALL done in gdb_init, and we would only mess it up |
| 1115 | here. The sync stuff should really go away over time. */ |
| 1116 | |
| 1117 | if (event_loop_p) |
| 1118 | { |
| 1119 | gdb_stdout = stdio_fileopen (stdout); |
| 1120 | gdb_stderr = stdio_fileopen (stderr); |
| 1121 | gdb_stdlog = gdb_stderr; /* for moment */ |
| 1122 | gdb_stdtarg = gdb_stderr; /* for moment */ |
| 1123 | |
| 1124 | /* If the input stream is connected to a terminal, turn on |
| 1125 | editing. */ |
| 1126 | if (ISATTY (instream)) |
| 1127 | { |
| 1128 | /* Tell gdb that we will be using the readline library. This |
| 1129 | could be overwritten by a command in .gdbinit like 'set |
| 1130 | editing on' or 'off'. */ |
| 1131 | async_command_editing_p = 1; |
| 1132 | |
| 1133 | /* When a character is detected on instream by select or |
| 1134 | poll, readline will be invoked via this callback |
| 1135 | function. */ |
| 1136 | call_readline = rl_callback_read_char_wrapper; |
| 1137 | } |
| 1138 | else |
| 1139 | { |
| 1140 | async_command_editing_p = 0; |
| 1141 | call_readline = gdb_readline2; |
| 1142 | } |
| 1143 | |
| 1144 | /* When readline has read an end-of-line character, it passes |
| 1145 | the complete line to gdb for processing. command_line_handler |
| 1146 | is the function that does this. */ |
| 1147 | input_handler = command_line_handler; |
| 1148 | |
| 1149 | /* Tell readline to use the same input stream that gdb uses. */ |
| 1150 | rl_instream = instream; |
| 1151 | |
| 1152 | /* Get a file descriptor for the input stream, so that we can |
| 1153 | register it with the event loop. */ |
| 1154 | input_fd = fileno (instream); |
| 1155 | |
| 1156 | /* Now we need to create the event sources for the input file |
| 1157 | descriptor. */ |
| 1158 | /* At this point in time, this is the only event source that we |
| 1159 | register with the even loop. Another source is going to be |
| 1160 | the target program (inferior), but that must be registered |
| 1161 | only when it actually exists (I.e. after we say 'run' or |
| 1162 | after we connect to a remote target. */ |
| 1163 | add_file_handler (input_fd, stdin_event_handler, 0); |
| 1164 | } |
| 1165 | } |
| 1166 | |
| 1167 | /* Disable command input through the standard CLI channels. Used in |
| 1168 | the suspend proc for interpreters that use the standard gdb readline |
| 1169 | interface, like the cli & the mi. */ |
| 1170 | void |
| 1171 | gdb_disable_readline (void) |
| 1172 | { |
| 1173 | if (event_loop_p) |
| 1174 | { |
| 1175 | /* FIXME - It is too heavyweight to delete and remake these |
| 1176 | every time you run an interpreter that needs readline. |
| 1177 | It is probably better to have the interpreters cache these, |
| 1178 | which in turn means that this needs to be moved into interpreter |
| 1179 | specific code. */ |
| 1180 | |
| 1181 | #if 0 |
| 1182 | ui_file_delete (gdb_stdout); |
| 1183 | ui_file_delete (gdb_stderr); |
| 1184 | gdb_stdlog = NULL; |
| 1185 | gdb_stdtarg = NULL; |
| 1186 | #endif |
| 1187 | |
| 1188 | rl_callback_handler_remove (); |
| 1189 | delete_file_handler (input_fd); |
| 1190 | } |
| 1191 | } |