Mercurial > octave
annotate src/sighandlers.cc @ 10182:0522a65bcd56
assume unistd.h and sys/types.h exist
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Thu, 21 Jan 2010 15:41:19 -0500 |
| parents | cd96d29c5efa |
| children | d4f813c3f5ed |
| rev | line source |
|---|---|
| 1 | 1 /* |
| 2 | |
| 7017 | 3 Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, |
| 8920 | 4 2003, 2004, 2005, 2006, 2007, 2008, 2009 John W. Eaton |
| 1 | 5 |
| 6 This file is part of Octave. | |
| 7 | |
| 8 Octave is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 7016 | 10 Free Software Foundation; either version 3 of the License, or (at your |
| 11 option) any later version. | |
| 1 | 12 |
| 13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 7016 | 19 along with Octave; see the file COPYING. If not, see |
| 20 <http://www.gnu.org/licenses/>. | |
| 1 | 21 |
| 22 */ | |
| 23 | |
| 240 | 24 #ifdef HAVE_CONFIG_H |
| 1230 | 25 #include <config.h> |
| 1 | 26 #endif |
| 27 | |
| 2536 | 28 #include <cstdlib> |
| 29 | |
| 3503 | 30 #include <iostream> |
| 1344 | 31 #include <new> |
| 32 | |
| 834 | 33 #include <sys/types.h> |
| 34 #include <unistd.h> | |
| 1343 | 35 |
| 3281 | 36 #include "cmd-edit.h" |
| 5453 | 37 #include "oct-syscalls.h" |
| 4153 | 38 #include "quit.h" |
| 3281 | 39 |
|
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40 #include "debug.h" |
| 4185 | 41 #include "defun.h" |
| 1352 | 42 #include "error.h" |
| 1373 | 43 #include "load-save.h" |
| 4294 | 44 #include "oct-map.h" |
| 2091 | 45 #include "pager.h" |
| 4185 | 46 #include "pt-bp.h" |
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47 #include "pt-eval.h" |
| 1 | 48 #include "sighandlers.h" |
| 4787 | 49 #include "sysdep.h" |
| 1352 | 50 #include "syswait.h" |
| 2091 | 51 #include "toplev.h" |
| 1 | 52 #include "utils.h" |
| 5794 | 53 #include "variables.h" |
| 1 | 54 |
| 55 // Nonzero means we have already printed a message for this series of | |
| 56 // SIGPIPES. We assume that the writer will eventually give up. | |
| 57 int pipe_handler_error_count = 0; | |
| 58 | |
| 3018 | 59 // TRUE means we can be interrupted. |
| 60 bool can_interrupt = false; | |
| 1 | 61 |
| 4185 | 62 // TRUE means we should try to enter the debugger on SIGINT. |
| 63 static bool Vdebug_on_interrupt = false; | |
| 64 | |
| 4449 | 65 // Allow users to avoid writing octave-core for SIGHUP (sent by |
| 66 // closing gnome-terminal, for example). Note that this variable has | |
| 67 // no effect if Vcrash_dumps_octave_core is FALSE. | |
| 5794 | 68 static bool Vsighup_dumps_octave_core = true; |
| 4449 | 69 |
| 70 // Similar to Vsighup_dumps_octave_core, but for SIGTERM signal. | |
| 5794 | 71 static bool Vsigterm_dumps_octave_core = true; |
| 4449 | 72 |
| 6098 | 73 #if defined (RETSIGTYPE_IS_VOID) |
| 2469 | 74 #define SIGHANDLER_RETURN(status) return |
| 75 #else | |
| 76 #define SIGHANDLER_RETURN(status) return status | |
| 77 #endif | |
| 78 | |
| 2554 | 79 #if defined (MUST_REINSTALL_SIGHANDLERS) |
| 80 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ | |
| 81 octave_set_signal_handler (sig, handler) | |
| 2931 | 82 #define REINSTALL_USES_SIG 1 |
| 2554 | 83 #else |
| 84 #define MAYBE_REINSTALL_SIGHANDLER(sig, handler) \ | |
| 85 do { } while (0) | |
| 86 #endif | |
| 87 | |
| 88 #if defined (__EMX__) | |
| 2626 | 89 #define MAYBE_ACK_SIGNAL(sig) \ |
| 2554 | 90 octave_set_signal_handler (sig, SIG_ACK) |
| 2931 | 91 #define ACK_USES_SIG 1 |
| 2554 | 92 #else |
| 2626 | 93 #define MAYBE_ACK_SIGNAL(sig) \ |
| 2554 | 94 do { } while (0) |
| 95 #endif | |
| 96 | |
| 5142 | 97 // List of signals we have caught since last call to octave_signal_handler. |
| 98 static bool octave_signals_caught[NSIG]; | |
| 99 | |
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100 // Called from octave_quit () to actually do something about the signals |
| 5142 | 101 // we have caught. |
| 102 | |
| 103 void | |
| 104 octave_signal_handler (void) | |
| 105 { | |
| 106 // The list of signals is relatively short, so we will just go | |
| 107 // linearly through the list. | |
| 108 | |
| 109 for (int i = 0; i < NSIG; i++) | |
| 110 { | |
| 111 if (octave_signals_caught[i]) | |
| 112 { | |
| 113 octave_signals_caught[i] = false; | |
| 114 | |
| 115 switch (i) | |
| 116 { | |
| 5451 | 117 #ifdef SIGCHLD |
| 5142 | 118 case SIGCHLD: |
| 119 octave_child_list::reap (); | |
| 120 break; | |
| 5451 | 121 #endif |
| 5142 | 122 |
| 123 case SIGFPE: | |
| 124 std::cerr << "warning: floating point exception -- trying to return to prompt" << std::endl; | |
| 125 break; | |
| 126 | |
| 5451 | 127 #ifdef SIGPIPE |
| 5142 | 128 case SIGPIPE: |
| 129 std::cerr << "warning: broken pipe -- some output may be lost" << std::endl; | |
| 130 break; | |
| 5451 | 131 #endif |
| 5142 | 132 } |
| 133 } | |
| 134 } | |
| 135 } | |
| 136 | |
| 1 | 137 static void |
| 4787 | 138 my_friendly_exit (const char *sig_name, int sig_number, |
| 139 bool save_vars = true) | |
| 1 | 140 { |
| 2536 | 141 static bool been_there_done_that = false; |
| 142 | |
| 143 if (been_there_done_that) | |
| 144 { | |
| 2554 | 145 #if defined (SIGABRT) |
| 2536 | 146 octave_set_signal_handler (SIGABRT, SIG_DFL); |
| 147 #endif | |
| 148 | |
| 3644 | 149 std::cerr << "panic: attempted clean up apparently failed -- aborting...\n"; |
| 5451 | 150 |
| 151 MINGW_SIGNAL_CLEANUP (); | |
| 152 | |
| 2536 | 153 abort (); |
| 154 } | |
| 155 else | |
| 156 { | |
| 157 been_there_done_that = true; | |
| 1373 | 158 |
| 3644 | 159 std::cerr << "panic: " << sig_name << " -- stopping myself...\n"; |
| 2536 | 160 |
| 4787 | 161 if (save_vars) |
| 4791 | 162 dump_octave_core (); |
| 2536 | 163 |
| 3162 | 164 if (sig_number < 0) |
| 5451 | 165 { |
| 166 MINGW_SIGNAL_CLEANUP (); | |
| 167 | |
| 168 exit (1); | |
| 169 } | |
| 3162 | 170 else |
| 171 { | |
| 172 octave_set_signal_handler (sig_number, SIG_DFL); | |
| 173 | |
| 4092 | 174 #if defined (HAVE_RAISE) |
| 175 raise (sig_number); | |
| 176 #elif defined (HAVE_KILL) | |
| 3162 | 177 kill (getpid (), sig_number); |
| 4092 | 178 #else |
| 179 exit (1); | |
| 180 #endif | |
| 3162 | 181 } |
| 4092 | 182 |
| 2536 | 183 } |
| 1 | 184 } |
| 185 | |
| 1446 | 186 sig_handler * |
| 5770 | 187 octave_set_signal_handler (int sig, sig_handler *handler, |
| 188 bool restart_syscalls) | |
| 1446 | 189 { |
| 190 #if defined (HAVE_POSIX_SIGNALS) | |
| 191 struct sigaction act, oact; | |
| 5144 | 192 |
| 1446 | 193 act.sa_handler = handler; |
| 194 act.sa_flags = 0; | |
| 5144 | 195 |
| 196 if (sig == SIGALRM) | |
| 197 { | |
| 198 #if defined (SA_INTERRUPT) | |
| 199 act.sa_flags |= SA_INTERRUPT; | |
| 200 #endif | |
| 201 } | |
| 202 #if defined (SA_RESTART) | |
| 5775 | 203 // FIXME -- Do we also need to explicitly disable SA_RESTART? |
| 5770 | 204 else if (restart_syscalls) |
| 205 act.sa_flags |= SA_RESTART; | |
| 5144 | 206 #endif |
| 207 | |
| 1446 | 208 sigemptyset (&act.sa_mask); |
| 209 sigemptyset (&oact.sa_mask); | |
| 5144 | 210 |
| 1446 | 211 sigaction (sig, &act, &oact); |
| 5144 | 212 |
| 1446 | 213 return oact.sa_handler; |
| 214 #else | |
| 215 return signal (sig, handler); | |
| 216 #endif | |
| 217 } | |
| 218 | |
| 1 | 219 static RETSIGTYPE |
| 1446 | 220 generic_sig_handler (int sig) |
| 1 | 221 { |
| 5844 | 222 my_friendly_exit (strsignal (sig), sig); |
| 1 | 223 |
| 2469 | 224 SIGHANDLER_RETURN (0); |
| 1 | 225 } |
| 226 | |
| 2091 | 227 // Handle SIGCHLD. |
| 1230 | 228 |
| 4064 | 229 #ifdef SIGCHLD |
| 1230 | 230 static RETSIGTYPE |
| 2092 | 231 sigchld_handler (int /* sig */) |
| 1230 | 232 { |
| 2705 | 233 volatile octave_interrupt_handler saved_interrupt_handler |
| 2554 | 234 = octave_ignore_interrupts (); |
| 235 | |
| 2626 | 236 // I wonder if this is really right, or if SIGCHLD should just be |
| 237 // blocked on OS/2 systems the same as for systems with POSIX signal | |
| 238 // functions. | |
| 239 | |
| 240 #if defined (__EMX__) | |
| 2554 | 241 volatile sig_handler *saved_sigchld_handler |
| 2626 | 242 = octave_set_signal_handler (SIGCHLD, SIG_IGN); |
| 2554 | 243 #endif |
| 244 | |
| 2626 | 245 sigset_t set, oset; |
| 246 | |
| 247 BLOCK_CHILD (set, oset); | |
| 248 | |
| 5142 | 249 if (octave_child_list::wait ()) |
| 2554 | 250 { |
| 5142 | 251 // The status of some child changed. |
| 2209 | 252 |
| 5142 | 253 octave_signal_caught = 1; |
| 2197 | 254 |
| 5142 | 255 octave_signals_caught[SIGCHLD] = true; |
| 1230 | 256 } |
| 2469 | 257 |
| 2600 | 258 octave_set_interrupt_handler (saved_interrupt_handler); |
| 2554 | 259 |
| 2626 | 260 UNBLOCK_CHILD (oset); |
| 261 | |
| 262 #ifdef __EMX__ | |
| 2554 | 263 octave_set_signal_handler (SIGCHLD, saved_sigchld_handler); |
| 2475 | 264 #endif |
| 265 | |
| 2626 | 266 MAYBE_ACK_SIGNAL (SIGCHLD); |
| 2554 | 267 |
| 268 MAYBE_REINSTALL_SIGHANDLER (SIGCHLD, sigchld_handler); | |
| 269 | |
| 2469 | 270 SIGHANDLER_RETURN (0); |
| 1230 | 271 } |
| 4064 | 272 #endif /* defined(SIGCHLD) */ |
| 1230 | 273 |
| 4064 | 274 #ifdef SIGFPE |
| 1373 | 275 #if defined (__alpha__) |
| 276 static RETSIGTYPE | |
| 1488 | 277 sigfpe_handler (int /* sig */) |
| 1373 | 278 { |
| 2626 | 279 MAYBE_ACK_SIGNAL (SIGFPE); |
| 2554 | 280 |
| 281 MAYBE_REINSTALL_SIGHANDLER (SIGFPE, sigfpe_handler); | |
| 1373 | 282 |
| 5142 | 283 if (can_interrupt && octave_interrupt_state >= 0) |
| 284 { | |
| 285 octave_signal_caught = 1; | |
| 1373 | 286 |
| 5142 | 287 octave_signals_caught[SIGFPE] = true; |
| 4182 | 288 |
| 5142 | 289 octave_interrupt_state++; |
| 290 } | |
| 1373 | 291 |
| 2469 | 292 SIGHANDLER_RETURN (0); |
| 1373 | 293 } |
| 4064 | 294 #endif /* defined(__alpha__) */ |
| 295 #endif /* defined(SIGFPE) */ | |
| 1373 | 296 |
| 4449 | 297 #if defined (SIGHUP) || defined (SIGTERM) |
| 298 static RETSIGTYPE | |
| 299 sig_hup_or_term_handler (int sig) | |
| 300 { | |
| 301 MAYBE_ACK_SIGNAL (sig); | |
| 302 | |
| 303 MAYBE_REINSTALL_SIGHANDLER (sig, sig_hup_or_term_handler); | |
| 304 | |
| 305 switch (sig) | |
| 306 { | |
| 307 #if defined (SIGHUP) | |
| 308 case SIGHUP: | |
| 309 { | |
| 310 if (Vsighup_dumps_octave_core) | |
| 4791 | 311 dump_octave_core (); |
| 4449 | 312 } |
| 313 break; | |
| 314 #endif | |
| 315 | |
| 316 #if defined (SIGTERM) | |
| 317 case SIGTERM: | |
| 318 { | |
| 319 if (Vsigterm_dumps_octave_core) | |
| 4791 | 320 dump_octave_core (); |
| 4449 | 321 } |
| 322 break; | |
| 323 #endif | |
| 324 | |
| 325 default: | |
| 326 break; | |
| 327 } | |
| 328 | |
| 329 clean_up_and_exit (0); | |
| 330 | |
| 331 SIGHANDLER_RETURN (0); | |
| 332 } | |
| 333 #endif | |
| 334 | |
| 3343 | 335 #if 0 |
| 3281 | 336 #if defined (SIGWINCH) |
| 337 static RETSIGTYPE | |
| 338 sigwinch_handler (int /* sig */) | |
| 339 { | |
| 340 MAYBE_ACK_SIGNAL (SIGWINCH); | |
| 341 | |
| 342 MAYBE_REINSTALL_SIGHANDLER (SIGWINCH, sigwinch_handler); | |
| 343 | |
| 344 command_editor::resize_terminal (); | |
| 345 | |
| 346 SIGHANDLER_RETURN (0); | |
| 347 } | |
| 348 #endif | |
| 3343 | 349 #endif |
| 3281 | 350 |
| 635 | 351 // Handle SIGINT by restarting the parser (see octave.cc). |
| 2554 | 352 // |
| 353 // This also has to work for SIGBREAK (on systems that have it), so we | |
| 354 // use the value of sig, instead of just assuming that it is called | |
| 355 // for SIGINT only. | |
| 635 | 356 |
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357 static void |
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358 user_abort (const char *sig_name, int sig_number) |
| 1 | 359 { |
| 4172 | 360 if (! octave_initialized) |
| 361 exit (1); | |
| 362 | |
| 1 | 363 if (can_interrupt) |
| 364 { | |
| 4185 | 365 if (Vdebug_on_interrupt) |
| 366 { | |
| 367 if (! octave_debug_on_interrupt_state) | |
| 368 { | |
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369 tree_evaluator::debug_mode = true; |
| 4185 | 370 octave_debug_on_interrupt_state = true; |
| 371 | |
| 5451 | 372 return; |
| 4185 | 373 } |
| 374 else | |
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375 { |
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376 // Clear the flag and do normal interrupt stuff. |
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377 |
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378 tree_evaluator::debug_mode = bp_table::have_breakpoints (); |
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379 octave_debug_on_interrupt_state = false; |
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380 } |
| 4185 | 381 } |
| 382 | |
| 4153 | 383 if (octave_interrupt_immediately) |
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384 { |
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385 if (octave_interrupt_state == 0) |
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386 octave_interrupt_state = 1; |
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387 |
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388 octave_jump_to_enclosing_context (); |
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389 } |
| 4429 | 390 else |
| 4787 | 391 { |
| 4793 | 392 // If we are already cleaning up from a previous interrupt, |
| 393 // take note of the fact that another interrupt signal has | |
| 394 // arrived. | |
| 395 | |
| 396 if (octave_interrupt_state < 0) | |
| 397 octave_interrupt_state = 0; | |
| 398 | |
| 5142 | 399 octave_signal_caught = 1; |
| 4787 | 400 octave_interrupt_state++; |
| 401 | |
| 4791 | 402 if (interactive && octave_interrupt_state == 2) |
| 403 std::cerr << "Press Control-C again to abort." << std::endl; | |
| 4787 | 404 |
| 4791 | 405 if (octave_interrupt_state >= 3) |
| 5451 | 406 my_friendly_exit (sig_name, sig_number, true); |
| 4787 | 407 } |
| 1 | 408 } |
| 409 | |
| 5451 | 410 } |
| 411 | |
| 412 static RETSIGTYPE | |
| 413 sigint_handler (int sig) | |
| 414 { | |
| 415 MAYBE_ACK_SIGNAL (sig); | |
| 416 | |
| 417 MAYBE_REINSTALL_SIGHANDLER (sig, sigint_handler); | |
| 418 | |
| 419 #ifdef USE_W32_SIGINT | |
| 420 if (w32_in_main_thread ()) | |
| 5844 | 421 user_abort (strsignal (sig), sig); |
| 5451 | 422 else |
| 423 w32_raise (sig); | |
| 424 #else | |
| 5844 | 425 user_abort (strsignal (sig), sig); |
| 5451 | 426 #endif |
| 427 | |
| 2469 | 428 SIGHANDLER_RETURN (0); |
| 1 | 429 } |
| 430 | |
| 4064 | 431 #ifdef SIGPIPE |
| 1 | 432 static RETSIGTYPE |
| 1488 | 433 sigpipe_handler (int /* sig */) |
| 1 | 434 { |
| 2626 | 435 MAYBE_ACK_SIGNAL (SIGPIPE); |
| 2554 | 436 |
| 437 MAYBE_REINSTALL_SIGHANDLER (SIGPIPE, sigpipe_handler); | |
| 834 | 438 |
| 5142 | 439 octave_signal_caught = 1; |
| 440 | |
| 441 octave_signals_caught[SIGPIPE] = true; | |
| 1 | 442 |
| 1358 | 443 // Don't loop forever on account of this. |
| 444 | |
| 5142 | 445 if (pipe_handler_error_count++ > 100 && octave_interrupt_state >= 0) |
| 4787 | 446 octave_interrupt_state++; |
| 1 | 447 |
| 2469 | 448 SIGHANDLER_RETURN (0); |
| 1 | 449 } |
| 4064 | 450 #endif /* defined(SIGPIPE) */ |
| 1 | 451 |
| 5451 | 452 #ifdef USE_W32_SIGINT |
| 453 static BOOL CALLBACK | |
| 454 w32_sigint_handler (DWORD sig) | |
| 455 { | |
| 456 const char *sig_name; | |
| 457 | |
| 458 switch(sig) | |
| 459 { | |
| 460 case CTRL_BREAK_EVENT: | |
| 461 sig_name = "Ctrl-Break"; | |
| 462 break; | |
| 463 case CTRL_C_EVENT: | |
| 464 sig_name = "Ctrl-C"; | |
| 465 break; | |
| 466 case CTRL_CLOSE_EVENT: | |
| 467 sig_name = "close console"; | |
| 468 break; | |
| 469 case CTRL_LOGOFF_EVENT: | |
| 470 sig_name = "logoff"; | |
| 471 break; | |
| 472 case CTRL_SHUTDOWN_EVENT: | |
| 473 sig_name = "shutdown"; | |
| 474 break; | |
| 475 default: | |
| 476 sig_name = "unknown console event"; | |
| 477 break; | |
| 478 } | |
| 479 | |
| 480 switch(sig) | |
| 481 { | |
| 482 case CTRL_BREAK_EVENT: | |
| 483 case CTRL_C_EVENT: | |
| 484 w32_raise (SIGINT); | |
| 485 break; | |
| 486 | |
| 487 case CTRL_CLOSE_EVENT: | |
| 488 case CTRL_LOGOFF_EVENT: | |
| 489 case CTRL_SHUTDOWN_EVENT: | |
| 490 default: | |
| 491 // We should do the following: | |
| 492 // clean_up_and_exit (0); | |
| 493 // We can't because we aren't running in the normal Octave thread. | |
| 494 user_abort(sig_name, sig); | |
| 495 break; | |
| 496 } | |
| 497 | |
| 498 // Return TRUE if the event was handled, or FALSE if another handler | |
| 499 // should be called. | |
| 5775 | 500 // FIXME check that windows terminates the thread. |
| 5451 | 501 return TRUE; |
| 502 } | |
| 503 #endif /* w32_sigint_handler */ | |
| 504 | |
| 505 | |
| 2705 | 506 octave_interrupt_handler |
| 2554 | 507 octave_catch_interrupts (void) |
| 508 { | |
| 2705 | 509 octave_interrupt_handler retval; |
| 2554 | 510 |
| 511 #ifdef SIGINT | |
| 2705 | 512 retval.int_handler = octave_set_signal_handler (SIGINT, sigint_handler); |
| 2554 | 513 #endif |
| 514 | |
| 515 #ifdef SIGBREAK | |
| 2705 | 516 retval.brk_handler = octave_set_signal_handler (SIGBREAK, sigint_handler); |
| 2554 | 517 #endif |
| 2705 | 518 |
| 5451 | 519 #ifdef USE_W32_SIGINT |
| 520 | |
| 521 // Intercept windows console control events. | |
| 522 // Note that the windows console signal handlers chain, so if | |
| 523 // install_signal_handlers is called more than once in the same program, | |
| 524 // then first call the following to avoid duplicates: | |
| 525 // | |
| 526 // SetConsoleCtrlHandler (w32_sigint_handler, FALSE); | |
| 527 | |
| 528 if (! SetConsoleCtrlHandler (w32_sigint_handler, TRUE)) | |
| 529 error ("SetConsoleCtrlHandler failed with %ld\n", GetLastError ()); | |
| 530 | |
| 531 w32_set_quiet_shutdown (); | |
| 532 | |
| 533 #endif | |
| 534 | |
| 2705 | 535 return retval; |
| 2554 | 536 } |
| 537 | |
| 2705 | 538 octave_interrupt_handler |
| 539 octave_ignore_interrupts (void) | |
| 2554 | 540 { |
| 2705 | 541 octave_interrupt_handler retval; |
| 542 | |
| 2554 | 543 #ifdef SIGINT |
| 2705 | 544 retval.int_handler = octave_set_signal_handler (SIGINT, SIG_IGN); |
| 2554 | 545 #endif |
| 546 | |
| 547 #ifdef SIGBREAK | |
| 2705 | 548 retval.brk_handler = octave_set_signal_handler (SIGBREAK, SIG_IGN); |
| 2554 | 549 #endif |
| 2705 | 550 |
| 551 return retval; | |
| 552 } | |
| 553 | |
| 554 octave_interrupt_handler | |
| 5770 | 555 octave_set_interrupt_handler (const volatile octave_interrupt_handler& h, |
| 556 bool restart_syscalls) | |
| 2705 | 557 { |
| 558 octave_interrupt_handler retval; | |
| 559 | |
| 560 #ifdef SIGINT | |
| 5770 | 561 retval.int_handler = octave_set_signal_handler (SIGINT, h.int_handler, |
| 562 restart_syscalls); | |
| 2705 | 563 #endif |
| 564 | |
| 565 #ifdef SIGBREAK | |
| 5770 | 566 retval.brk_handler = octave_set_signal_handler (SIGBREAK, h.brk_handler, |
| 567 restart_syscalls); | |
| 2705 | 568 #endif |
| 569 | |
| 570 return retval; | |
| 1651 | 571 } |
| 572 | |
| 635 | 573 // Install all the handlers for the signals we might care about. |
| 574 | |
| 1 | 575 void |
| 576 install_signal_handlers (void) | |
| 577 { | |
| 5142 | 578 for (int i = 0; i < NSIG; i++) |
| 579 octave_signals_caught[i] = false; | |
| 580 | |
| 2554 | 581 octave_catch_interrupts (); |
| 582 | |
| 1 | 583 #ifdef SIGABRT |
| 1446 | 584 octave_set_signal_handler (SIGABRT, generic_sig_handler); |
| 1 | 585 #endif |
| 586 | |
| 587 #ifdef SIGALRM | |
| 1446 | 588 octave_set_signal_handler (SIGALRM, generic_sig_handler); |
| 1 | 589 #endif |
| 590 | |
| 591 #ifdef SIGBUS | |
| 1446 | 592 octave_set_signal_handler (SIGBUS, generic_sig_handler); |
| 1 | 593 #endif |
| 594 | |
| 1230 | 595 #ifdef SIGCHLD |
| 1446 | 596 octave_set_signal_handler (SIGCHLD, sigchld_handler); |
| 1230 | 597 #endif |
| 598 | |
| 3174 | 599 // SIGCLD |
| 600 // SIGCONT | |
| 601 | |
| 1 | 602 #ifdef SIGEMT |
| 1446 | 603 octave_set_signal_handler (SIGEMT, generic_sig_handler); |
| 1 | 604 #endif |
| 605 | |
| 606 #ifdef SIGFPE | |
| 1373 | 607 #if defined (__alpha__) |
| 1446 | 608 octave_set_signal_handler (SIGFPE, sigfpe_handler); |
| 1373 | 609 #else |
| 1446 | 610 octave_set_signal_handler (SIGFPE, generic_sig_handler); |
| 1 | 611 #endif |
| 1373 | 612 #endif |
| 1 | 613 |
| 614 #ifdef SIGHUP | |
| 4449 | 615 octave_set_signal_handler (SIGHUP, sig_hup_or_term_handler); |
| 1 | 616 #endif |
| 617 | |
| 618 #ifdef SIGILL | |
| 1446 | 619 octave_set_signal_handler (SIGILL, generic_sig_handler); |
| 1 | 620 #endif |
| 621 | |
| 3174 | 622 // SIGINFO |
| 623 // SIGINT | |
| 624 | |
| 1 | 625 #ifdef SIGIOT |
| 1446 | 626 octave_set_signal_handler (SIGIOT, generic_sig_handler); |
| 1 | 627 #endif |
| 628 | |
| 629 #ifdef SIGLOST | |
| 1446 | 630 octave_set_signal_handler (SIGLOST, generic_sig_handler); |
| 1 | 631 #endif |
| 632 | |
| 633 #ifdef SIGPIPE | |
| 1446 | 634 octave_set_signal_handler (SIGPIPE, sigpipe_handler); |
| 1 | 635 #endif |
| 636 | |
| 637 #ifdef SIGPOLL | |
| 1446 | 638 octave_set_signal_handler (SIGPOLL, SIG_IGN); |
| 1 | 639 #endif |
| 640 | |
| 5866 | 641 // SIGPROF |
| 3174 | 642 // SIGPWR |
| 643 | |
| 1 | 644 #ifdef SIGQUIT |
| 1446 | 645 octave_set_signal_handler (SIGQUIT, generic_sig_handler); |
| 1 | 646 #endif |
| 647 | |
| 648 #ifdef SIGSEGV | |
| 1446 | 649 octave_set_signal_handler (SIGSEGV, generic_sig_handler); |
| 1 | 650 #endif |
| 651 | |
| 3174 | 652 // SIGSTOP |
| 653 | |
| 1 | 654 #ifdef SIGSYS |
| 1446 | 655 octave_set_signal_handler (SIGSYS, generic_sig_handler); |
| 1 | 656 #endif |
| 657 | |
| 658 #ifdef SIGTERM | |
| 4449 | 659 octave_set_signal_handler (SIGTERM, sig_hup_or_term_handler); |
| 1 | 660 #endif |
| 661 | |
| 662 #ifdef SIGTRAP | |
| 1446 | 663 octave_set_signal_handler (SIGTRAP, generic_sig_handler); |
| 1 | 664 #endif |
| 665 | |
| 3174 | 666 // SIGTSTP |
| 667 // SIGTTIN | |
| 668 // SIGTTOU | |
| 669 // SIGURG | |
| 670 | |
| 1 | 671 #ifdef SIGUSR1 |
| 1446 | 672 octave_set_signal_handler (SIGUSR1, generic_sig_handler); |
| 1 | 673 #endif |
| 674 | |
| 675 #ifdef SIGUSR2 | |
| 1446 | 676 octave_set_signal_handler (SIGUSR2, generic_sig_handler); |
| 1 | 677 #endif |
| 678 | |
| 679 #ifdef SIGVTALRM | |
| 1446 | 680 octave_set_signal_handler (SIGVTALRM, generic_sig_handler); |
| 1 | 681 #endif |
| 682 | |
| 895 | 683 #ifdef SIGIO |
| 1446 | 684 octave_set_signal_handler (SIGIO, SIG_IGN); |
| 895 | 685 #endif |
| 686 | |
| 3343 | 687 #if 0 |
| 3281 | 688 #ifdef SIGWINCH |
| 689 octave_set_signal_handler (SIGWINCH, sigwinch_handler); | |
| 690 #endif | |
| 3343 | 691 #endif |
| 3174 | 692 |
| 1 | 693 #ifdef SIGXCPU |
| 1446 | 694 octave_set_signal_handler (SIGXCPU, generic_sig_handler); |
| 1 | 695 #endif |
| 696 | |
| 697 #ifdef SIGXFSZ | |
| 1446 | 698 octave_set_signal_handler (SIGXFSZ, generic_sig_handler); |
| 1 | 699 #endif |
| 5451 | 700 |
| 1 | 701 } |
| 702 | |
| 4294 | 703 static Octave_map |
| 704 make_sig_struct (void) | |
| 705 { | |
| 706 Octave_map m; | |
| 707 | |
| 708 #ifdef SIGABRT | |
| 4675 | 709 m.assign ("ABRT", SIGABRT); |
| 4294 | 710 #endif |
| 711 | |
| 712 #ifdef SIGALRM | |
| 4675 | 713 m.assign ("ALRM", SIGALRM); |
| 4294 | 714 #endif |
| 715 | |
| 716 #ifdef SIGBUS | |
| 4675 | 717 m.assign ("BUS", SIGBUS); |
| 4294 | 718 #endif |
| 719 | |
| 720 #ifdef SIGCHLD | |
| 4675 | 721 m.assign ("CHLD", SIGCHLD); |
| 4294 | 722 #endif |
| 723 | |
| 724 #ifdef SIGCLD | |
| 4675 | 725 m.assign ("CLD", SIGCLD); |
| 4294 | 726 #endif |
| 727 | |
| 728 #ifdef SIGCONT | |
| 4675 | 729 m.assign ("CONT", SIGCONT); |
| 4294 | 730 #endif |
| 731 | |
| 732 #ifdef SIGEMT | |
| 4675 | 733 m.assign ("EMT", SIGEMT); |
| 4294 | 734 #endif |
| 735 | |
| 736 #ifdef SIGFPE | |
| 4675 | 737 m.assign ("FPE", SIGFPE); |
| 4294 | 738 #endif |
| 739 | |
| 740 #ifdef SIGHUP | |
| 4675 | 741 m.assign ("HUP", SIGHUP); |
| 4294 | 742 #endif |
| 743 | |
| 744 #ifdef SIGILL | |
| 4675 | 745 m.assign ("ILL", SIGILL); |
| 4294 | 746 #endif |
| 747 | |
| 748 #ifdef SIGINFO | |
| 4675 | 749 m.assign ("INFO", SIGINFO); |
| 4294 | 750 #endif |
| 751 | |
| 752 #ifdef SIGINT | |
| 4675 | 753 m.assign ("INT", SIGINT); |
| 4294 | 754 #endif |
| 755 | |
| 756 #ifdef SIGIOT | |
| 4675 | 757 m.assign ("IOT", SIGIOT); |
| 4294 | 758 #endif |
| 759 | |
| 760 #ifdef SIGLOST | |
| 4675 | 761 m.assign ("LOST", SIGLOST); |
| 4294 | 762 #endif |
| 763 | |
| 764 #ifdef SIGPIPE | |
| 4675 | 765 m.assign ("PIPE", SIGPIPE); |
| 4294 | 766 #endif |
| 767 | |
| 768 #ifdef SIGPOLL | |
| 4675 | 769 m.assign ("POLL", SIGPOLL); |
| 4294 | 770 #endif |
| 771 | |
| 772 #ifdef SIGPROF | |
| 4675 | 773 m.assign ("PROF", SIGPROF); |
| 4294 | 774 #endif |
| 775 | |
| 776 #ifdef SIGPWR | |
| 4675 | 777 m.assign ("PWR", SIGPWR); |
| 4294 | 778 #endif |
| 779 | |
| 780 #ifdef SIGQUIT | |
| 4675 | 781 m.assign ("QUIT", SIGQUIT); |
| 4294 | 782 #endif |
| 783 | |
| 784 #ifdef SIGSEGV | |
| 4675 | 785 m.assign ("SEGV", SIGSEGV); |
| 4294 | 786 #endif |
| 787 | |
| 788 #ifdef SIGSTOP | |
| 4675 | 789 m.assign ("STOP", SIGSTOP); |
| 4294 | 790 #endif |
| 791 | |
| 792 #ifdef SIGSYS | |
| 4675 | 793 m.assign ("SYS", SIGSYS); |
| 4294 | 794 #endif |
| 795 | |
| 796 #ifdef SIGTERM | |
| 4675 | 797 m.assign ("TERM", SIGTERM); |
| 4294 | 798 #endif |
| 799 | |
| 800 #ifdef SIGTRAP | |
| 4675 | 801 m.assign ("TRAP", SIGTRAP); |
| 4294 | 802 #endif |
| 803 | |
| 804 #ifdef SIGTSTP | |
| 4675 | 805 m.assign ("TSTP", SIGTSTP); |
| 4294 | 806 #endif |
| 807 | |
| 808 #ifdef SIGTTIN | |
| 4675 | 809 m.assign ("TTIN", SIGTTIN); |
| 4294 | 810 #endif |
| 811 | |
| 812 #ifdef SIGTTOU | |
| 4675 | 813 m.assign ("TTOU", SIGTTOU); |
| 4294 | 814 #endif |
| 815 | |
| 816 #ifdef SIGURG | |
| 4675 | 817 m.assign ("URG", SIGURG); |
| 4294 | 818 #endif |
| 819 | |
| 820 #ifdef SIGUSR1 | |
| 4675 | 821 m.assign ("USR1", SIGUSR1); |
| 4294 | 822 #endif |
| 823 | |
| 824 #ifdef SIGUSR2 | |
| 4675 | 825 m.assign ("USR2", SIGUSR2); |
| 4294 | 826 #endif |
| 827 | |
| 828 #ifdef SIGVTALRM | |
| 4675 | 829 m.assign ("VTALRM", SIGVTALRM); |
| 4294 | 830 #endif |
| 831 | |
| 832 #ifdef SIGIO | |
| 4675 | 833 m.assign ("IO", SIGIO); |
| 4294 | 834 #endif |
| 835 | |
| 836 #ifdef SIGWINCH | |
| 4675 | 837 m.assign ("WINCH", SIGWINCH); |
| 4294 | 838 #endif |
| 839 | |
| 840 #ifdef SIGXCPU | |
| 4675 | 841 m.assign ("XCPU", SIGXCPU); |
| 4294 | 842 #endif |
| 843 | |
| 844 #ifdef SIGXFSZ | |
| 4675 | 845 m.assign ("XFSZ", SIGXFSZ); |
| 4294 | 846 #endif |
| 847 | |
| 848 return m; | |
| 849 } | |
| 850 | |
| 5142 | 851 octave_child_list::octave_child_list_rep *octave_child_list::instance = 0; |
| 5128 | 852 |
| 2926 | 853 bool |
| 854 octave_child_list::instance_ok (void) | |
| 855 { | |
| 856 bool retval = true; | |
| 857 | |
| 858 if (! instance) | |
| 5142 | 859 instance = new octave_child_list_rep (); |
| 2926 | 860 |
| 861 if (! instance) | |
| 862 { | |
| 863 ::error ("unable to create child list object!"); | |
| 864 | |
| 865 retval = false; | |
| 866 } | |
| 867 | |
| 868 return retval; | |
| 869 } | |
| 870 | |
| 871 void | |
| 5142 | 872 octave_child_list::insert (pid_t pid, octave_child::child_event_handler f) |
| 873 { | |
| 874 if (instance_ok ()) | |
| 875 instance->insert (pid, f); | |
| 876 } | |
| 877 | |
| 878 void | |
| 879 octave_child_list::reap (void) | |
| 2926 | 880 { |
| 881 if (instance_ok ()) | |
| 5142 | 882 instance->reap (); |
| 883 } | |
| 884 | |
| 885 bool | |
| 886 octave_child_list::wait (void) | |
| 887 { | |
| 888 return (instance_ok ()) ? instance->wait () : false; | |
| 2926 | 889 } |
| 890 | |
| 5142 | 891 class pid_equal |
| 892 { | |
| 893 public: | |
| 894 | |
| 895 pid_equal (pid_t v) : val (v) { } | |
| 896 | |
| 897 bool operator () (const octave_child& oc) const { return oc.pid == val; } | |
| 898 | |
| 899 private: | |
| 900 | |
| 901 pid_t val; | |
| 902 }; | |
| 903 | |
| 2926 | 904 void |
| 905 octave_child_list::remove (pid_t pid) | |
| 906 { | |
| 907 if (instance_ok ()) | |
| 5142 | 908 instance->remove_if (pid_equal (pid)); |
| 2926 | 909 } |
| 910 | |
| 5142 | 911 #define OCL_REP octave_child_list::octave_child_list_rep |
| 2926 | 912 |
| 5142 | 913 void |
| 914 OCL_REP::insert (pid_t pid, octave_child::child_event_handler f) | |
| 2926 | 915 { |
| 5142 | 916 append (octave_child (pid, f)); |
| 2926 | 917 } |
| 918 | |
| 2209 | 919 void |
| 5142 | 920 OCL_REP::reap (void) |
| 2209 | 921 { |
| 5142 | 922 // Mark the record for PID invalid. |
| 2209 | 923 |
| 5142 | 924 for (iterator p = begin (); p != end (); p++) |
| 925 { | |
| 926 // The call to the octave_child::child_event_handler might | |
| 927 // invalidate the iterator (for example, by calling | |
| 928 // octave_child_list::remove), so we increment the iterator | |
| 929 // here. | |
| 2209 | 930 |
| 5142 | 931 octave_child& oc = *p; |
| 2209 | 932 |
| 5142 | 933 if (oc.have_status) |
| 2209 | 934 { |
| 5142 | 935 oc.have_status = 0; |
| 936 | |
| 937 octave_child::child_event_handler f = oc.handler; | |
| 938 | |
| 939 if (f && f (oc.pid, oc.status)) | |
| 940 oc.pid = -1; | |
| 2209 | 941 } |
| 942 } | |
| 943 | |
| 5142 | 944 remove_if (pid_equal (-1)); |
| 2209 | 945 } |
| 946 | |
| 5142 | 947 // Wait on our children and record any changes in their status. |
| 948 | |
| 949 bool | |
| 950 OCL_REP::wait (void) | |
| 2210 | 951 { |
| 5142 | 952 bool retval = false; |
| 2210 | 953 |
| 5142 | 954 for (iterator p = begin (); p != end (); p++) |
| 2210 | 955 { |
| 5142 | 956 octave_child& oc = *p; |
| 957 | |
| 958 pid_t pid = oc.pid; | |
| 959 | |
| 960 if (pid > 0) | |
| 961 { | |
| 962 int status; | |
| 2210 | 963 |
| 5453 | 964 if (octave_syscalls::waitpid (pid, &status, WNOHANG) > 0) |
| 5142 | 965 { |
| 966 oc.have_status = 1; | |
| 967 | |
| 968 oc.status = status; | |
| 969 | |
| 970 retval = true; | |
| 971 | |
| 972 break; | |
| 973 } | |
| 2210 | 974 } |
| 975 } | |
| 976 | |
| 5142 | 977 return retval; |
| 2210 | 978 } |
| 979 | |
| 5780 | 980 DEFUN (SIG, args, , |
| 981 "-*- texinfo -*-\n\ | |
| 982 @deftypefn {Built-in Function} {} SIG ()\n\ | |
| 983 Return a structure containing Unix signal names and their defined values.\n\ | |
| 984 @end deftypefn") | |
| 985 { | |
| 986 octave_value retval; | |
| 987 | |
| 988 if (args.length () == 0) | |
| 989 { | |
| 990 static Octave_map m = make_sig_struct (); | |
| 991 | |
| 992 retval = m; | |
| 993 } | |
| 994 else | |
| 5823 | 995 print_usage (); |
| 5780 | 996 |
| 997 return retval; | |
| 998 } | |
| 999 | |
| 5794 | 1000 DEFUN (debug_on_interrupt, args, nargout, |
| 1001 "-*- texinfo -*-\n\ | |
| 1002 @deftypefn {Built-in Function} {@var{val} =} debug_on_interrupt ()\n\ | |
| 1003 @deftypefnx {Built-in Function} {@var{old_val} =} debug_on_interrupt (@var{new_val})\n\ | |
| 1004 Query or set the internal variable that controls whether Octave will try\n\ | |
| 1005 to enter debugging mode when it receives an interrupt signal (typically\n\ | |
| 1006 generated with @kbd{C-c}). If a second interrupt signal is received\n\ | |
| 1007 before reaching the debugging mode, a normal interrupt will occur.\n\ | |
| 1008 @end deftypefn") | |
| 4449 | 1009 { |
| 5794 | 1010 return SET_INTERNAL_VARIABLE (debug_on_interrupt); |
| 4449 | 1011 } |
| 1012 | |
| 5794 | 1013 DEFUN (sighup_dumps_octave_core, args, nargout, |
| 1014 "-*- texinfo -*-\n\ | |
| 1015 @deftypefn {Built-in Function} {@var{val} =} sighup_dumps_octave_core ()\n\ | |
| 1016 @deftypefnx {Built-in Function} {@var{old_val} =} sighup_dumps_octave_core (@var{new_val})\n\ | |
| 1017 Query or set the internal variable that controls whether Octave tries\n\ | |
| 6653 | 1018 to save all current variables to the file \"octave-core\" if it receives\n\ |
| 5794 | 1019 a hangup signal.\n\ |
| 1020 @end deftypefn") | |
| 4185 | 1021 { |
| 5794 | 1022 return SET_INTERNAL_VARIABLE (sighup_dumps_octave_core); |
| 1023 } | |
| 4294 | 1024 |
| 5794 | 1025 DEFUN (sigterm_dumps_octave_core, args, nargout, |
| 1026 "-*- texinfo -*-\n\ | |
| 1027 @deftypefn {Built-in Function} {@var{val} =} sigterm_dumps_octave_core ()\n\ | |
| 1028 @deftypefnx {Built-in Function} {@var{old_val} =} sigterm_dumps_octave_core (@var{new_val})\n\ | |
| 1029 Query or set the internal variable that controls whether Octave tries\n\ | |
| 6653 | 1030 to save all current variables to the file \"octave-core\" if it receives\n\ |
| 5794 | 1031 a terminate signal.\n\ |
| 1032 @end deftypefn") | |
| 1033 { | |
| 1034 return SET_INTERNAL_VARIABLE (sigterm_dumps_octave_core); | |
| 4185 | 1035 } |