| 1 | /* Top level stuff for GDB, the GNU debugger. |
| 2 | Copyright 1999 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, Boston, MA 02111-1307, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "event-loop.h" |
| 23 | #include "top.h" |
| 24 | #ifdef HAVE_POLL |
| 25 | #include <sys/poll.h> |
| 26 | #endif |
| 27 | #include "inferior.h" |
| 28 | #include "terminal.h" /* for job_control*/ |
| 29 | |
| 30 | /* readline include files */ |
| 31 | #include <readline/readline.h> |
| 32 | #include <readline/history.h> |
| 33 | |
| 34 | /* readline defines this. */ |
| 35 | #undef savestring |
| 36 | |
| 37 | extern void _initialize_event_loop (void); |
| 38 | |
| 39 | static void command_line_handler PARAMS ((char *)); |
| 40 | static void gdb_readline2 PARAMS ((void)); |
| 41 | static void pop_prompt PARAMS ((void)); |
| 42 | static void push_prompt PARAMS ((char *, char *, char *)); |
| 43 | static void change_line_handler PARAMS ((void)); |
| 44 | static void change_annotation_level PARAMS ((void)); |
| 45 | static void command_handler PARAMS ((char *)); |
| 46 | |
| 47 | /* Signal handlers. */ |
| 48 | static void handle_sigint PARAMS ((int)); |
| 49 | static void handle_sigquit PARAMS ((int)); |
| 50 | static void handle_sighup PARAMS ((int)); |
| 51 | static void handle_sigfpe PARAMS ((int)); |
| 52 | static void handle_sigwinch PARAMS ((int)); |
| 53 | /* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT. */ |
| 54 | #ifndef STOP_SIGNAL |
| 55 | #ifdef SIGTSTP |
| 56 | #define STOP_SIGNAL SIGTSTP |
| 57 | void handle_stop_sig PARAMS ((int)); |
| 58 | #endif |
| 59 | #endif |
| 60 | |
| 61 | /* Functions to be invoked by the event loop in response to |
| 62 | signals. */ |
| 63 | void async_request_quit PARAMS ((gdb_client_data)); |
| 64 | static void async_do_nothing PARAMS ((gdb_client_data)); |
| 65 | static void async_disconnect PARAMS ((gdb_client_data)); |
| 66 | static void async_float_handler PARAMS ((gdb_client_data)); |
| 67 | static void async_stop_sig PARAMS ((gdb_client_data)); |
| 68 | |
| 69 | /* If this definition isn't overridden by the header files, assume |
| 70 | that isatty and fileno exist on this system. */ |
| 71 | #ifndef ISATTY |
| 72 | #define ISATTY(FP) (isatty (fileno (FP))) |
| 73 | #endif |
| 74 | |
| 75 | /* Readline offers an alternate interface, via callback |
| 76 | functions. These are all included in the file callback.c in the |
| 77 | readline distribution. This file provides (mainly) a function, which |
| 78 | the event loop uses as callback (i.e. event handler) whenever an event |
| 79 | is detected on the standard input file descriptor. |
| 80 | readline_callback_read_char is called (by the GDB event loop) whenever |
| 81 | there is a new character ready on the input stream. This function |
| 82 | incrementally builds a buffer internal to readline where it |
| 83 | accumulates the line read up to the point of invocation. In the |
| 84 | special case in which the character read is newline, the function |
| 85 | invokes a GDB supplied callback routine, which does the processing of |
| 86 | a full command line. This latter routine is the asynchronous analog |
| 87 | of the old command_line_input in gdb. Instead of invoking (and waiting |
| 88 | for) readline to read the command line and pass it back to |
| 89 | command_loop for processing, the new command_line_handler function has |
| 90 | the command line already available as its parameter. INPUT_HANDLER is |
| 91 | to be set to the function that readline will invoke when a complete |
| 92 | line of input is ready. CALL_READLINE is to be set to the function |
| 93 | that readline offers as callback to the event_loop. */ |
| 94 | |
| 95 | void (*input_handler) PARAMS ((char *)); |
| 96 | void (*call_readline) PARAMS ((void)); |
| 97 | |
| 98 | /* Important variables for the event loop. */ |
| 99 | |
| 100 | /* This is used to determine if GDB is using the readline library or |
| 101 | its own simplified form of readline. It is used by the asynchronous |
| 102 | form of the set editing command. |
| 103 | ezannoni: as of 1999-04-29 I expect that this |
| 104 | variable will not be used after gdb is changed to use the event |
| 105 | loop as default engine, and event-top.c is merged into top.c. */ |
| 106 | int async_command_editing_p; |
| 107 | |
| 108 | /* This variable contains the new prompt that the user sets with the |
| 109 | set prompt command. */ |
| 110 | char *new_async_prompt; |
| 111 | |
| 112 | /* This is the annotation suffix that will be used when the |
| 113 | annotation_level is 2. */ |
| 114 | char *async_annotation_suffix; |
| 115 | |
| 116 | /* This is the file descriptor for the input stream that GDB uses to |
| 117 | read commands from. */ |
| 118 | int input_fd; |
| 119 | |
| 120 | /* This is the prompt stack. Prompts will be pushed on the stack as |
| 121 | needed by the different 'kinds' of user inputs GDB is asking |
| 122 | for. See event-loop.h. */ |
| 123 | struct prompts the_prompts; |
| 124 | |
| 125 | /* signal handling variables */ |
| 126 | /* Each of these is a pointer to a function that the event loop will |
| 127 | invoke if the corresponding signal has received. The real signal |
| 128 | handlers mark these functions as ready to be executed and the event |
| 129 | loop, in a later iteration, calls them. See the function |
| 130 | invoke_async_signal_handler. */ |
| 131 | PTR sigint_token; |
| 132 | #ifdef SIGHUP |
| 133 | PTR sighup_token; |
| 134 | #endif |
| 135 | PTR sigquit_token; |
| 136 | PTR sigfpe_token; |
| 137 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
| 138 | PTR sigwinch_token; |
| 139 | #endif |
| 140 | #ifdef STOP_SIGNAL |
| 141 | PTR sigtstp_token; |
| 142 | #endif |
| 143 | |
| 144 | void mark_async_signal_handler_wrapper PARAMS ((void *)); |
| 145 | |
| 146 | /* Structure to save a partially entered command. This is used when |
| 147 | the user types '\' at the end of a command line. This is necessary |
| 148 | because each line of input is handled by a different call to |
| 149 | command_line_handler, and normally there is no state retained |
| 150 | between different calls. */ |
| 151 | int more_to_come = 0; |
| 152 | |
| 153 | struct readline_input_state |
| 154 | { |
| 155 | char *linebuffer; |
| 156 | char *linebuffer_ptr; |
| 157 | } |
| 158 | readline_input_state; |
| 159 | \f |
| 160 | |
| 161 | /* Initialize all the necessary variables, start the event loop, |
| 162 | register readline, and stdin. */ |
| 163 | void |
| 164 | start_event_loop () |
| 165 | { |
| 166 | int length; |
| 167 | char *a_prompt; |
| 168 | |
| 169 | /* If we are using readline, set things up and display the first |
| 170 | prompt, otherwise just print the prompt. */ |
| 171 | if (async_command_editing_p) |
| 172 | { |
| 173 | /* Tell readline what the prompt to display is and what function it |
| 174 | will need to call after a whole line is read. This also displays |
| 175 | the first prompt.*/ |
| 176 | length = strlen (PREFIX (0)) + strlen (PROMPT (0)) + strlen (SUFFIX (0)) + 1; |
| 177 | a_prompt = (char *) xmalloc (length); |
| 178 | strcpy (a_prompt, PREFIX (0)); |
| 179 | strcat (a_prompt, PROMPT (0)); |
| 180 | strcat (a_prompt, SUFFIX (0)); |
| 181 | rl_callback_handler_install (a_prompt, input_handler); |
| 182 | } |
| 183 | else |
| 184 | display_gdb_prompt (0); |
| 185 | |
| 186 | /* Loop until there is something to do. This is the entry point to |
| 187 | the event loop engine. gdb_do_one_event will process one event |
| 188 | for each invocation. It always returns 1, unless there are no |
| 189 | more event sources registered. In this case it returns 0. */ |
| 190 | while (gdb_do_one_event () != 0) |
| 191 | ; |
| 192 | |
| 193 | /* We are done with the event loop. There are no more event sources |
| 194 | to listen to. So we exit GDB. */ |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | /* Change the function to be invoked every time there is a character |
| 199 | ready on stdin. This is used when the user sets the editing off, |
| 200 | therefore bypassing readline, and letting gdb handle the input |
| 201 | itself, via gdb_readline2. Also it is used in the opposite case in |
| 202 | which the user sets editing on again, by restoring readline |
| 203 | handling of the input. */ |
| 204 | static void |
| 205 | change_line_handler () |
| 206 | { |
| 207 | if (async_command_editing_p) |
| 208 | { |
| 209 | /* Turn on editing by using readline. */ |
| 210 | call_readline = rl_callback_read_char; |
| 211 | input_handler = command_line_handler; |
| 212 | } |
| 213 | else |
| 214 | { |
| 215 | /* Turn off editing by using gdb_readline2. */ |
| 216 | rl_callback_handler_remove (); |
| 217 | call_readline = gdb_readline2; |
| 218 | |
| 219 | /* Set up the command handler as well, in case we are called as |
| 220 | first thing from .gdbinit. */ |
| 221 | input_handler = command_line_handler; |
| 222 | } |
| 223 | |
| 224 | /* To tell the event loop to change the handler associated with the |
| 225 | input file descriptor, we need to create a new event source, |
| 226 | corresponding to the same fd, but with a new event handler |
| 227 | function. */ |
| 228 | delete_file_handler (input_fd); |
| 229 | #ifdef HAVE_POLL |
| 230 | create_file_handler (input_fd, POLLIN, |
| 231 | (file_handler_func *) call_readline, 0); |
| 232 | #else |
| 233 | create_file_handler (input_fd, GDB_READABLE, |
| 234 | (file_handler_func *) call_readline, 0); |
| 235 | #endif |
| 236 | } |
| 237 | |
| 238 | /* Displays the prompt. The prompt that is displayed is the current |
| 239 | top of the prompt stack, if the argument NEW_PROMPT is |
| 240 | 0. Otherwise, it displays whatever NEW_PROMPT is. This is used |
| 241 | after each gdb command has completed, and in the following cases: |
| 242 | 1. when the user enters a command line which is ended by '\' |
| 243 | indicating that the command will continue on the next line. |
| 244 | In that case the prompt that is displayed is the empty string. |
| 245 | 2. When the user is entering 'commands' for a breakpoint, or |
| 246 | actions for a tracepoint. In this case the prompt will be '>' |
| 247 | 3. Other???? |
| 248 | FIXME: 2. & 3. not implemented yet for async. */ |
| 249 | void |
| 250 | display_gdb_prompt (new_prompt) |
| 251 | char *new_prompt; |
| 252 | { |
| 253 | int prompt_length = 0; |
| 254 | |
| 255 | if (!new_prompt) |
| 256 | { |
| 257 | /* Just use the top of the prompt stack. */ |
| 258 | prompt_length = strlen (PREFIX (0)) + |
| 259 | strlen (SUFFIX (0)) + |
| 260 | strlen (PROMPT (0)) + 1; |
| 261 | |
| 262 | new_prompt = (char *) alloca (prompt_length); |
| 263 | |
| 264 | /* Prefix needs to have new line at end. */ |
| 265 | strcpy (new_prompt, PREFIX (0)); |
| 266 | strcat (new_prompt, PROMPT (0)); |
| 267 | /* Suffix needs to have a new line at end and \032 \032 at |
| 268 | beginning. */ |
| 269 | strcat (new_prompt, SUFFIX (0)); |
| 270 | } |
| 271 | |
| 272 | if (async_command_editing_p) |
| 273 | { |
| 274 | rl_callback_handler_remove (); |
| 275 | rl_callback_handler_install (new_prompt, input_handler); |
| 276 | } |
| 277 | else if (new_prompt) |
| 278 | { |
| 279 | /* Don't use a _filtered function here. It causes the assumed |
| 280 | character position to be off, since the newline we read from |
| 281 | the user is not accounted for. */ |
| 282 | fputs_unfiltered (new_prompt, gdb_stdout); |
| 283 | |
| 284 | #ifdef MPW |
| 285 | /* Move to a new line so the entered line doesn't have a prompt |
| 286 | on the front of it. */ |
| 287 | fputs_unfiltered ("\n", gdb_stdout); |
| 288 | #endif /* MPW */ |
| 289 | gdb_flush (gdb_stdout); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | /* Used when the user requests a different annotation level, with |
| 294 | 'set annotate'. It pushes a new prompt (with prefix and suffix) on top |
| 295 | of the prompt stack, if the annotation level desired is 2, otherwise |
| 296 | it pops the top of the prompt stack when we want the annotation level |
| 297 | to be the normal ones (1 or 2). */ |
| 298 | static void |
| 299 | change_annotation_level () |
| 300 | { |
| 301 | char *prefix, *suffix; |
| 302 | |
| 303 | if (!PREFIX (0) || !PROMPT (0) || !SUFFIX (0)) |
| 304 | { |
| 305 | /* The prompt stack has not been initialized to "", we are |
| 306 | using gdb w/o the --async switch */ |
| 307 | warning ("Command has same effect as set annotate"); |
| 308 | return; |
| 309 | } |
| 310 | |
| 311 | if (annotation_level > 1) |
| 312 | { |
| 313 | if (!strcmp (PREFIX (0), "") && !strcmp (SUFFIX (0), "")) |
| 314 | { |
| 315 | /* Push a new prompt if the previous annotation_level was not >1. */ |
| 316 | prefix = (char *) alloca (strlen (async_annotation_suffix) + 10); |
| 317 | strcpy (prefix, "\n\032\032pre-"); |
| 318 | strcat (prefix, async_annotation_suffix); |
| 319 | strcat (prefix, "\n"); |
| 320 | |
| 321 | suffix = (char *) alloca (strlen (async_annotation_suffix) + 6); |
| 322 | strcpy (suffix, "\n\032\032"); |
| 323 | strcat (suffix, async_annotation_suffix); |
| 324 | strcat (suffix, "\n"); |
| 325 | |
| 326 | push_prompt (prefix, (char *) 0, suffix); |
| 327 | } |
| 328 | } |
| 329 | else |
| 330 | { |
| 331 | if (strcmp (PREFIX (0), "") && strcmp (SUFFIX (0), "")) |
| 332 | { |
| 333 | /* Pop the top of the stack, we are going back to annotation < 1. */ |
| 334 | pop_prompt (); |
| 335 | } |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | /* Pushes a new prompt on the prompt stack. Each prompt has three |
| 340 | parts: prefix, prompt, suffix. Usually prefix and suffix are empty |
| 341 | strings, except when the annotation level is 2. Memory is allocated |
| 342 | within savestring for the new prompt. */ |
| 343 | static void |
| 344 | push_prompt (prefix, prompt, suffix) |
| 345 | char *prefix; |
| 346 | char *prompt; |
| 347 | char *suffix; |
| 348 | { |
| 349 | the_prompts.top++; |
| 350 | PREFIX (0) = savestring (prefix, strlen (prefix)); |
| 351 | |
| 352 | if (prompt) |
| 353 | PROMPT (0) = savestring (prompt, strlen (prompt)); |
| 354 | else |
| 355 | PROMPT (0) = savestring (PROMPT (-1), strlen (PROMPT (-1))); |
| 356 | |
| 357 | SUFFIX (0) = savestring (suffix, strlen (suffix)); |
| 358 | } |
| 359 | |
| 360 | /* Pops the top of the prompt stack, and frees the memory allocated for it. */ |
| 361 | static void |
| 362 | pop_prompt () |
| 363 | { |
| 364 | if (strcmp (PROMPT (0), PROMPT (-1))) |
| 365 | { |
| 366 | free (PROMPT (-1)); |
| 367 | PROMPT (-1) = savestring (PROMPT (0), strlen (PROMPT (0))); |
| 368 | } |
| 369 | |
| 370 | free (PREFIX (0)); |
| 371 | free (PROMPT (0)); |
| 372 | free (SUFFIX (0)); |
| 373 | the_prompts.top--; |
| 374 | } |
| 375 | \f |
| 376 | /* Handles a gdb command. This function is called by |
| 377 | command_line_handler, which has processed one or more input lines |
| 378 | into COMMAND. */ |
| 379 | /* NOTE: 1999-04-30 This is the asynchronous version of the command_loop |
| 380 | function. The command_loop function will be obsolete when we |
| 381 | switch to use the event loop at every execution of gdb. */ |
| 382 | static void |
| 383 | command_handler (command) |
| 384 | char *command; |
| 385 | { |
| 386 | struct cleanup *old_chain; |
| 387 | int stdin_is_tty = ISATTY (stdin); |
| 388 | long time_at_cmd_start; |
| 389 | #ifdef HAVE_SBRK |
| 390 | long space_at_cmd_start = 0; |
| 391 | #endif |
| 392 | extern int display_time; |
| 393 | extern int display_space; |
| 394 | |
| 395 | #if defined(TUI) |
| 396 | extern int insert_mode; |
| 397 | #endif |
| 398 | |
| 399 | quit_flag = 0; |
| 400 | if (instream == stdin && stdin_is_tty) |
| 401 | reinitialize_more_filter (); |
| 402 | old_chain = make_cleanup ((make_cleanup_func) command_loop_marker, 0); |
| 403 | |
| 404 | #if defined(TUI) |
| 405 | insert_mode = 0; |
| 406 | #endif |
| 407 | /* If readline returned a NULL command, it means that the |
| 408 | connection with the terminal is gone. This happens at the |
| 409 | end of a testsuite run, after Expect has hung up |
| 410 | but GDB is still alive. In such a case, we just quit gdb |
| 411 | killing the inferior program too. */ |
| 412 | if (command == 0) |
| 413 | quit_command ((char *) 0, stdin == instream); |
| 414 | |
| 415 | time_at_cmd_start = get_run_time (); |
| 416 | |
| 417 | if (display_space) |
| 418 | { |
| 419 | #ifdef HAVE_SBRK |
| 420 | extern char **environ; |
| 421 | char *lim = (char *) sbrk (0); |
| 422 | |
| 423 | space_at_cmd_start = (long) (lim - (char *) &environ); |
| 424 | #endif |
| 425 | } |
| 426 | |
| 427 | execute_command (command, instream == stdin); |
| 428 | |
| 429 | /* Do any commands attached to breakpoint we stopped at. */ |
| 430 | bpstat_do_actions (&stop_bpstat); |
| 431 | do_cleanups (old_chain); |
| 432 | |
| 433 | if (display_time) |
| 434 | { |
| 435 | long cmd_time = get_run_time () - time_at_cmd_start; |
| 436 | |
| 437 | printf_unfiltered ("Command execution time: %ld.%06ld\n", |
| 438 | cmd_time / 1000000, cmd_time % 1000000); |
| 439 | } |
| 440 | |
| 441 | if (display_space) |
| 442 | { |
| 443 | #ifdef HAVE_SBRK |
| 444 | extern char **environ; |
| 445 | char *lim = (char *) sbrk (0); |
| 446 | long space_now = lim - (char *) &environ; |
| 447 | long space_diff = space_now - space_at_cmd_start; |
| 448 | |
| 449 | printf_unfiltered ("Space used: %ld (%c%ld for this command)\n", |
| 450 | space_now, |
| 451 | (space_diff >= 0 ? '+' : '-'), |
| 452 | space_diff); |
| 453 | #endif |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | /* Handle a complete line of input. This is called by the callback |
| 458 | mechanism within the readline library. Deal with incomplete commands |
| 459 | as well, by saving the partial input in a global buffer. */ |
| 460 | |
| 461 | /* NOTE: 1999-04-30 This is the asynchronous version of the |
| 462 | command_line_input function. command_line_input will become |
| 463 | obsolete once we use the event loop as the default mechanism in |
| 464 | GDB. */ |
| 465 | static void |
| 466 | command_line_handler (rl) |
| 467 | char *rl; |
| 468 | { |
| 469 | static char *linebuffer = 0; |
| 470 | static unsigned linelength = 0; |
| 471 | register char *p; |
| 472 | char *p1; |
| 473 | int change_prompt = 0; |
| 474 | extern char *line; |
| 475 | extern int linesize; |
| 476 | char *nline; |
| 477 | char got_eof = 0; |
| 478 | |
| 479 | |
| 480 | int repeat = (instream == stdin); |
| 481 | |
| 482 | if (annotation_level > 1 && instream == stdin) |
| 483 | { |
| 484 | printf_unfiltered ("\n\032\032post-"); |
| 485 | printf_unfiltered (async_annotation_suffix); |
| 486 | printf_unfiltered ("\n"); |
| 487 | } |
| 488 | |
| 489 | if (linebuffer == 0) |
| 490 | { |
| 491 | linelength = 80; |
| 492 | linebuffer = (char *) xmalloc (linelength); |
| 493 | } |
| 494 | |
| 495 | p = linebuffer; |
| 496 | |
| 497 | if (more_to_come) |
| 498 | { |
| 499 | strcpy (linebuffer, readline_input_state.linebuffer); |
| 500 | p = readline_input_state.linebuffer_ptr; |
| 501 | free (readline_input_state.linebuffer); |
| 502 | more_to_come = 0; |
| 503 | change_prompt = 1; |
| 504 | } |
| 505 | |
| 506 | #ifdef STOP_SIGNAL |
| 507 | if (job_control) |
| 508 | signal (STOP_SIGNAL, handle_stop_sig); |
| 509 | #endif |
| 510 | |
| 511 | /* Make sure that all output has been output. Some machines may let |
| 512 | you get away with leaving out some of the gdb_flush, but not all. */ |
| 513 | wrap_here (""); |
| 514 | gdb_flush (gdb_stdout); |
| 515 | gdb_flush (gdb_stderr); |
| 516 | |
| 517 | if (source_file_name != NULL) |
| 518 | { |
| 519 | ++source_line_number; |
| 520 | sprintf (source_error, |
| 521 | "%s%s:%d: Error in sourced command file:\n", |
| 522 | source_pre_error, |
| 523 | source_file_name, |
| 524 | source_line_number); |
| 525 | error_pre_print = source_error; |
| 526 | } |
| 527 | |
| 528 | /* If we are in this case, then command_handler will call quit |
| 529 | and exit from gdb. */ |
| 530 | if (!rl || rl == (char *) EOF) |
| 531 | { |
| 532 | got_eof = 1; |
| 533 | command_handler (0); |
| 534 | } |
| 535 | if (strlen (rl) + 1 + (p - linebuffer) > linelength) |
| 536 | { |
| 537 | linelength = strlen (rl) + 1 + (p - linebuffer); |
| 538 | nline = (char *) xrealloc (linebuffer, linelength); |
| 539 | p += nline - linebuffer; |
| 540 | linebuffer = nline; |
| 541 | } |
| 542 | p1 = rl; |
| 543 | /* Copy line. Don't copy null at end. (Leaves line alone |
| 544 | if this was just a newline) */ |
| 545 | while (*p1) |
| 546 | *p++ = *p1++; |
| 547 | |
| 548 | free (rl); /* Allocated in readline. */ |
| 549 | |
| 550 | if (p == linebuffer || *(p - 1) == '\\') |
| 551 | { |
| 552 | /* We come here also if the line entered is empty (just a 'return') */ |
| 553 | p--; /* Put on top of '\'. */ |
| 554 | |
| 555 | if (*p == '\\') |
| 556 | { |
| 557 | readline_input_state.linebuffer = savestring (linebuffer, |
| 558 | strlen (linebuffer)); |
| 559 | readline_input_state.linebuffer_ptr = p; |
| 560 | |
| 561 | /* We will not invoke a execute_command if there is more |
| 562 | input expected to complete the command. So, we need to |
| 563 | print an empty prompt here. */ |
| 564 | display_gdb_prompt (""); |
| 565 | more_to_come = 1; |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | #ifdef STOP_SIGNAL |
| 570 | if (job_control) |
| 571 | signal (STOP_SIGNAL, SIG_DFL); |
| 572 | #endif |
| 573 | |
| 574 | #define SERVER_COMMAND_LENGTH 7 |
| 575 | server_command = |
| 576 | (p - linebuffer > SERVER_COMMAND_LENGTH) |
| 577 | && STREQN (linebuffer, "server ", SERVER_COMMAND_LENGTH); |
| 578 | if (server_command) |
| 579 | { |
| 580 | /* Note that we don't set `line'. Between this and the check in |
| 581 | dont_repeat, this insures that repeating will still do the |
| 582 | right thing. */ |
| 583 | *p = '\0'; |
| 584 | command_handler (linebuffer + SERVER_COMMAND_LENGTH); |
| 585 | display_gdb_prompt (0); |
| 586 | return; |
| 587 | } |
| 588 | |
| 589 | /* Do history expansion if that is wished. */ |
| 590 | if (history_expansion_p && instream == stdin |
| 591 | && ISATTY (instream)) |
| 592 | { |
| 593 | char *history_value; |
| 594 | int expanded; |
| 595 | |
| 596 | *p = '\0'; /* Insert null now. */ |
| 597 | expanded = history_expand (linebuffer, &history_value); |
| 598 | if (expanded) |
| 599 | { |
| 600 | /* Print the changes. */ |
| 601 | printf_unfiltered ("%s\n", history_value); |
| 602 | |
| 603 | /* If there was an error, call this function again. */ |
| 604 | if (expanded < 0) |
| 605 | { |
| 606 | free (history_value); |
| 607 | return; |
| 608 | } |
| 609 | if (strlen (history_value) > linelength) |
| 610 | { |
| 611 | linelength = strlen (history_value) + 1; |
| 612 | linebuffer = (char *) xrealloc (linebuffer, linelength); |
| 613 | } |
| 614 | strcpy (linebuffer, history_value); |
| 615 | p = linebuffer + strlen (linebuffer); |
| 616 | free (history_value); |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | /* If we just got an empty line, and that is supposed |
| 621 | to repeat the previous command, return the value in the |
| 622 | global buffer. */ |
| 623 | if (repeat && p == linebuffer && *p != '\\') |
| 624 | { |
| 625 | command_handler (line); |
| 626 | display_gdb_prompt (0); |
| 627 | return; |
| 628 | } |
| 629 | |
| 630 | for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++); |
| 631 | if (repeat && !*p1) |
| 632 | { |
| 633 | command_handler (line); |
| 634 | display_gdb_prompt (0); |
| 635 | return; |
| 636 | } |
| 637 | |
| 638 | *p = 0; |
| 639 | |
| 640 | /* Add line to history if appropriate. */ |
| 641 | if (instream == stdin |
| 642 | && ISATTY (stdin) && *linebuffer) |
| 643 | add_history (linebuffer); |
| 644 | |
| 645 | /* Note: lines consisting solely of comments are added to the command |
| 646 | history. This is useful when you type a command, and then |
| 647 | realize you don't want to execute it quite yet. You can comment |
| 648 | out the command and then later fetch it from the value history |
| 649 | and remove the '#'. The kill ring is probably better, but some |
| 650 | people are in the habit of commenting things out. */ |
| 651 | if (*p1 == '#') |
| 652 | *p1 = '\0'; /* Found a comment. */ |
| 653 | |
| 654 | /* Save into global buffer if appropriate. */ |
| 655 | if (repeat) |
| 656 | { |
| 657 | if (linelength > linesize) |
| 658 | { |
| 659 | line = xrealloc (line, linelength); |
| 660 | linesize = linelength; |
| 661 | } |
| 662 | strcpy (line, linebuffer); |
| 663 | if (!more_to_come) |
| 664 | { |
| 665 | command_handler (line); |
| 666 | display_gdb_prompt (0); |
| 667 | } |
| 668 | return; |
| 669 | } |
| 670 | |
| 671 | command_handler (linebuffer); |
| 672 | display_gdb_prompt (0); |
| 673 | return; |
| 674 | } |
| 675 | |
| 676 | /* Does reading of input from terminal w/o the editing features |
| 677 | provided by the readline library. */ |
| 678 | |
| 679 | /* NOTE: 1999-04-30 Asynchronous version of gdb_readline. gdb_readline |
| 680 | will become obsolete when the event loop is made the default |
| 681 | execution for gdb. */ |
| 682 | static void |
| 683 | gdb_readline2 () |
| 684 | { |
| 685 | int c; |
| 686 | char *result; |
| 687 | int input_index = 0; |
| 688 | int result_size = 80; |
| 689 | |
| 690 | result = (char *) xmalloc (result_size); |
| 691 | |
| 692 | /* We still need the while loop here, even though it would seem |
| 693 | obvious to invoke gdb_readline2 at every character entered. If |
| 694 | not using the readline library, the terminal is in cooked mode, |
| 695 | which sends the characters all at once. Poll will notice that the |
| 696 | input fd has changed state only after enter is pressed. At this |
| 697 | point we still need to fetch all the chars entered. */ |
| 698 | |
| 699 | while (1) |
| 700 | { |
| 701 | /* Read from stdin if we are executing a user defined command. |
| 702 | This is the right thing for prompt_for_continue, at least. */ |
| 703 | c = fgetc (instream ? instream : stdin); |
| 704 | |
| 705 | if (c == EOF) |
| 706 | { |
| 707 | if (input_index > 0) |
| 708 | /* The last line does not end with a newline. Return it, and |
| 709 | if we are called again fgetc will still return EOF and |
| 710 | we'll return NULL then. */ |
| 711 | break; |
| 712 | free (result); |
| 713 | (*input_handler) (0); |
| 714 | } |
| 715 | |
| 716 | if (c == '\n') |
| 717 | #ifndef CRLF_SOURCE_FILES |
| 718 | break; |
| 719 | #else |
| 720 | { |
| 721 | if (input_index > 0 && result[input_index - 1] == '\r') |
| 722 | input_index--; |
| 723 | break; |
| 724 | } |
| 725 | #endif |
| 726 | |
| 727 | result[input_index++] = c; |
| 728 | while (input_index >= result_size) |
| 729 | { |
| 730 | result_size *= 2; |
| 731 | result = (char *) xrealloc (result, result_size); |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | result[input_index++] = '\0'; |
| 736 | (*input_handler) (result); |
| 737 | } |
| 738 | \f |
| 739 | |
| 740 | /* Initialization of signal handlers and tokens. There is a function |
| 741 | handle_sig* for each of the signals GDB cares about. Specifically: |
| 742 | SIGINT, SIGFPE, SIGQUIT, SIGTSTP, SIGHUP, SIGWINCH. These |
| 743 | functions are the actual signal handlers associated to the signals |
| 744 | via calls to signal(). The only job for these functions is to |
| 745 | enqueue the appropriate event/procedure with the event loop. Such |
| 746 | procedures are the old signal handlers. The event loop will take |
| 747 | care of invoking the queued procedures to perform the usual tasks |
| 748 | associated with the reception of the signal. */ |
| 749 | /* NOTE: 1999-04-30 This is the asynchronous version of init_signals. |
| 750 | init_signals will become obsolete as we move to have to event loop |
| 751 | as the default for gdb. */ |
| 752 | void |
| 753 | async_init_signals () |
| 754 | { |
| 755 | signal (SIGINT, handle_sigint); |
| 756 | sigint_token = |
| 757 | create_async_signal_handler (async_request_quit, NULL); |
| 758 | |
| 759 | /* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed |
| 760 | to the inferior and breakpoints will be ignored. */ |
| 761 | #ifdef SIGTRAP |
| 762 | signal (SIGTRAP, SIG_DFL); |
| 763 | #endif |
| 764 | |
| 765 | /* If we initialize SIGQUIT to SIG_IGN, then the SIG_IGN will get |
| 766 | passed to the inferior, which we don't want. It would be |
| 767 | possible to do a "signal (SIGQUIT, SIG_DFL)" after we fork, but |
| 768 | on BSD4.3 systems using vfork, that can affect the |
| 769 | GDB process as well as the inferior (the signal handling tables |
| 770 | might be in memory, shared between the two). Since we establish |
| 771 | a handler for SIGQUIT, when we call exec it will set the signal |
| 772 | to SIG_DFL for us. */ |
| 773 | signal (SIGQUIT, handle_sigquit); |
| 774 | sigquit_token = |
| 775 | create_async_signal_handler (async_do_nothing, NULL); |
| 776 | #ifdef SIGHUP |
| 777 | if (signal (SIGHUP, handle_sighup) != SIG_IGN) |
| 778 | sighup_token = |
| 779 | create_async_signal_handler (async_disconnect, NULL); |
| 780 | else |
| 781 | sighup_token = |
| 782 | create_async_signal_handler (async_do_nothing, NULL); |
| 783 | #endif |
| 784 | signal (SIGFPE, handle_sigfpe); |
| 785 | sigfpe_token = |
| 786 | create_async_signal_handler (async_float_handler, NULL); |
| 787 | |
| 788 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
| 789 | signal (SIGWINCH, handle_sigwinch); |
| 790 | sigwinch_token = |
| 791 | create_async_signal_handler (SIGWINCH_HANDLER, NULL); |
| 792 | #endif |
| 793 | #ifdef STOP_SIGNAL |
| 794 | sigtstp_token = |
| 795 | create_async_signal_handler (async_stop_sig, NULL); |
| 796 | #endif |
| 797 | |
| 798 | } |
| 799 | |
| 800 | void |
| 801 | mark_async_signal_handler_wrapper (token) |
| 802 | void *token; |
| 803 | { |
| 804 | mark_async_signal_handler ((async_signal_handler *) token); |
| 805 | } |
| 806 | |
| 807 | /* Tell the event loop what to do if SIGINT is received. |
| 808 | See event-signal.c. */ |
| 809 | static void |
| 810 | handle_sigint (sig) |
| 811 | int sig; |
| 812 | { |
| 813 | signal (sig, handle_sigint); |
| 814 | |
| 815 | /* If immediate_quit is set, we go ahead and process the SIGINT right |
| 816 | away, even if we usually would defer this to the event loop. The |
| 817 | assumption here is that it is safe to process ^C immediately if |
| 818 | immediate_quit is set. If we didn't, SIGINT would be really |
| 819 | processed only the next time through the event loop. To get to |
| 820 | that point, though, the command that we want to interrupt needs to |
| 821 | finish first, which is unacceptable. */ |
| 822 | if (immediate_quit) |
| 823 | async_request_quit (0); |
| 824 | else |
| 825 | /* If immediate quit is not set, we process SIGINT the next time |
| 826 | through the loop, which is fine. */ |
| 827 | mark_async_signal_handler_wrapper (sigint_token); |
| 828 | } |
| 829 | |
| 830 | /* Do the quit. All the checks have been done by the caller. */ |
| 831 | void |
| 832 | async_request_quit (arg) |
| 833 | gdb_client_data arg; |
| 834 | { |
| 835 | quit_flag = 1; |
| 836 | #ifdef REQUEST_QUIT |
| 837 | REQUEST_QUIT; |
| 838 | #else |
| 839 | quit (); |
| 840 | #endif |
| 841 | } |
| 842 | |
| 843 | /* Tell the event loop what to do if SIGQUIT is received. |
| 844 | See event-signal.c. */ |
| 845 | static void |
| 846 | handle_sigquit (sig) |
| 847 | int sig; |
| 848 | { |
| 849 | mark_async_signal_handler_wrapper (sigquit_token); |
| 850 | signal (sig, handle_sigquit); |
| 851 | } |
| 852 | |
| 853 | /* Called by the event loop in response to a SIGQUIT. */ |
| 854 | static void |
| 855 | async_do_nothing (arg) |
| 856 | gdb_client_data arg; |
| 857 | { |
| 858 | /* Empty function body. */ |
| 859 | } |
| 860 | |
| 861 | #ifdef SIGHUP |
| 862 | /* Tell the event loop what to do if SIGHUP is received. |
| 863 | See event-signal.c. */ |
| 864 | static void |
| 865 | handle_sighup (sig) |
| 866 | int sig; |
| 867 | { |
| 868 | mark_async_signal_handler_wrapper (sighup_token); |
| 869 | signal (sig, handle_sighup); |
| 870 | } |
| 871 | |
| 872 | /* Called by the event loop to process a SIGHUP */ |
| 873 | static void |
| 874 | async_disconnect (arg) |
| 875 | gdb_client_data arg; |
| 876 | { |
| 877 | catch_errors (quit_cover, NULL, |
| 878 | "Could not kill the program being debugged", |
| 879 | RETURN_MASK_ALL); |
| 880 | signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */ |
| 881 | kill (getpid (), SIGHUP); |
| 882 | } |
| 883 | #endif |
| 884 | |
| 885 | #ifdef STOP_SIGNAL |
| 886 | void handle_stop_sig (sig) |
| 887 | int sig; |
| 888 | { |
| 889 | mark_async_signal_handler_wrapper (sigtstp_token); |
| 890 | signal (sig, handle_stop_sig); |
| 891 | } |
| 892 | |
| 893 | static void |
| 894 | async_stop_sig (arg) |
| 895 | gdb_client_data arg; |
| 896 | { |
| 897 | char *prompt = PROMPT (0); |
| 898 | #if STOP_SIGNAL == SIGTSTP |
| 899 | signal (SIGTSTP, SIG_DFL); |
| 900 | sigsetmask (0); |
| 901 | kill (getpid (), SIGTSTP); |
| 902 | signal (SIGTSTP, handle_stop_sig); |
| 903 | #else |
| 904 | signal (STOP_SIGNAL, handle_stop_sig); |
| 905 | #endif |
| 906 | printf_unfiltered ("%s", prompt); |
| 907 | gdb_flush (gdb_stdout); |
| 908 | |
| 909 | /* Forget about any previous command -- null line now will do nothing. */ |
| 910 | dont_repeat (); |
| 911 | } |
| 912 | #endif /* STOP_SIGNAL */ |
| 913 | |
| 914 | /* Tell the event loop what to do if SIGFPE is received. |
| 915 | See event-signal.c. */ |
| 916 | static void |
| 917 | handle_sigfpe (sig) |
| 918 | int sig; |
| 919 | { |
| 920 | mark_async_signal_handler_wrapper (sigfpe_token); |
| 921 | signal (sig, handle_sigfpe); |
| 922 | } |
| 923 | |
| 924 | /* Event loop will call this functin to process a SIGFPE. */ |
| 925 | static void |
| 926 | async_float_handler (arg) |
| 927 | gdb_client_data arg; |
| 928 | { |
| 929 | /* This message is based on ANSI C, section 4.7. Note that integer |
| 930 | divide by zero causes this, so "float" is a misnomer. */ |
| 931 | error ("Erroneous arithmetic operation."); |
| 932 | } |
| 933 | |
| 934 | /* Tell the event loop what to do if SIGWINCH is received. |
| 935 | See event-signal.c. */ |
| 936 | #if defined(SIGWINCH) && defined(SIGWINCH_HANDLER) |
| 937 | static void |
| 938 | handle_sigwinch (sig) |
| 939 | int sig; |
| 940 | { |
| 941 | mark_async_signal_handler_wrapper (sigwinch_token); |
| 942 | signal (sig, handle_sigwinch); |
| 943 | } |
| 944 | #endif |
| 945 | \f |
| 946 | |
| 947 | /* Called by do_setshow_command. */ |
| 948 | /* ARGSUSED */ |
| 949 | void |
| 950 | set_async_editing_command (args, from_tty, c) |
| 951 | char *args; |
| 952 | int from_tty; |
| 953 | struct cmd_list_element *c; |
| 954 | { |
| 955 | change_line_handler (); |
| 956 | } |
| 957 | |
| 958 | /* Called by do_setshow_command. */ |
| 959 | /* ARGSUSED */ |
| 960 | void |
| 961 | set_async_annotation_level (args, from_tty, c) |
| 962 | char *args; |
| 963 | int from_tty; |
| 964 | struct cmd_list_element *c; |
| 965 | { |
| 966 | change_annotation_level (); |
| 967 | } |
| 968 | |
| 969 | /* Called by do_setshow_command. */ |
| 970 | /* ARGSUSED */ |
| 971 | void |
| 972 | set_async_prompt (args, from_tty, c) |
| 973 | char *args; |
| 974 | int from_tty; |
| 975 | struct cmd_list_element *c; |
| 976 | { |
| 977 | PROMPT (0) = savestring (new_async_prompt, strlen (new_async_prompt)); |
| 978 | } |
| 979 | |
| 980 | /* Set things up for readline to be invoked via the alternate |
| 981 | interface, i.e. via a callback function (rl_callback_read_char), |
| 982 | and hook up instream to the event loop.*/ |
| 983 | void |
| 984 | _initialize_event_loop () |
| 985 | { |
| 986 | /* When a character is detected on instream by select or poll, readline |
| 987 | will be invoked via this callback function. */ |
| 988 | call_readline = rl_callback_read_char; |
| 989 | |
| 990 | /* When readline has read an end-of-line character, it passes the |
| 991 | complete line to gdb for processing. command_line_handler is the |
| 992 | function that does this. */ |
| 993 | input_handler = command_line_handler; |
| 994 | |
| 995 | /* Tell readline to use the same input stream that gdb uses. */ |
| 996 | rl_instream = instream; |
| 997 | |
| 998 | /* Get a file descriptor for the input stream, so that we can |
| 999 | register it with the event loop. */ |
| 1000 | input_fd = fileno (instream); |
| 1001 | |
| 1002 | /* Now we need to create the event sources for the input file descriptor. */ |
| 1003 | /* At this point in time, this is the only event source that we |
| 1004 | register with the even loop. Another source is going to be the |
| 1005 | target program (inferior), but that must be registered only when |
| 1006 | it actually exists (I.e. after we say 'run' or after we connect |
| 1007 | to a remote target. */ |
| 1008 | #ifdef HAVE_POLL |
| 1009 | create_file_handler (input_fd, POLLIN, |
| 1010 | (file_handler_func *) call_readline, 0); |
| 1011 | #else |
| 1012 | create_file_handler (input_fd, GDB_READABLE, |
| 1013 | (file_handler_func *) call_readline, 0); |
| 1014 | #endif |
| 1015 | } |
| 1016 | |