| 1 | /* Target-vector operations for controlling Unix child processes, for GDB. |
| 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by Cygnus Support. |
| 5 | |
| 6 | ## Contains temporary hacks.. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software |
| 22 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | Boston, MA 02111-1307, USA. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "frame.h" /* required by inferior.h */ |
| 27 | #include "inferior.h" |
| 28 | #include "target.h" |
| 29 | #include "gdbcore.h" |
| 30 | #include "command.h" |
| 31 | #include "gdb_stat.h" |
| 32 | #include <signal.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <fcntl.h> |
| 35 | |
| 36 | #include "gdb_wait.h" |
| 37 | |
| 38 | extern struct symtab_and_line *child_enable_exception_callback (enum |
| 39 | exception_event_kind, |
| 40 | int); |
| 41 | |
| 42 | extern struct exception_event_record |
| 43 | *child_get_current_exception_event (void); |
| 44 | |
| 45 | extern void _initialize_inftarg (void); |
| 46 | |
| 47 | static void child_prepare_to_store (void); |
| 48 | |
| 49 | #ifndef CHILD_WAIT |
| 50 | static int child_wait (int, struct target_waitstatus *); |
| 51 | #endif /* CHILD_WAIT */ |
| 52 | |
| 53 | #if !defined(CHILD_POST_WAIT) |
| 54 | void child_post_wait (int, int); |
| 55 | #endif |
| 56 | |
| 57 | static void child_open (char *, int); |
| 58 | |
| 59 | static void child_files_info (struct target_ops *); |
| 60 | |
| 61 | static void child_detach (char *, int); |
| 62 | |
| 63 | static void child_detach_from_process (int, char *, int, int); |
| 64 | |
| 65 | static void child_attach (char *, int); |
| 66 | |
| 67 | static void child_attach_to_process (char *, int, int); |
| 68 | |
| 69 | #if !defined(CHILD_POST_ATTACH) |
| 70 | extern void child_post_attach (int); |
| 71 | #endif |
| 72 | |
| 73 | static void child_require_attach (char *, int); |
| 74 | |
| 75 | static void child_require_detach (int, char *, int); |
| 76 | |
| 77 | static void ptrace_me (void); |
| 78 | |
| 79 | static void ptrace_him (int); |
| 80 | |
| 81 | static void child_create_inferior (char *, char *, char **); |
| 82 | |
| 83 | static void child_mourn_inferior (void); |
| 84 | |
| 85 | static int child_can_run (void); |
| 86 | |
| 87 | static void child_stop (void); |
| 88 | |
| 89 | #ifndef CHILD_THREAD_ALIVE |
| 90 | int child_thread_alive (int); |
| 91 | #endif |
| 92 | |
| 93 | static void init_child_ops (void); |
| 94 | |
| 95 | extern char **environ; |
| 96 | |
| 97 | struct target_ops child_ops; |
| 98 | |
| 99 | int child_suppress_run = 0; /* Non-zero if inftarg should pretend not to |
| 100 | be a runnable target. Used by targets |
| 101 | that can sit atop inftarg, such as HPUX |
| 102 | thread support. */ |
| 103 | |
| 104 | #ifndef CHILD_WAIT |
| 105 | |
| 106 | /*## */ |
| 107 | /* Enable HACK for ttrace work. In |
| 108 | * infttrace.c/require_notification_of_events, |
| 109 | * this is set to 0 so that the loop in child_wait |
| 110 | * won't loop. |
| 111 | */ |
| 112 | int not_same_real_pid = 1; |
| 113 | /*## */ |
| 114 | |
| 115 | |
| 116 | /* Wait for child to do something. Return pid of child, or -1 in case |
| 117 | of error; store status through argument pointer OURSTATUS. */ |
| 118 | |
| 119 | static int |
| 120 | child_wait (int pid, struct target_waitstatus *ourstatus) |
| 121 | { |
| 122 | int save_errno; |
| 123 | int status; |
| 124 | char *execd_pathname = NULL; |
| 125 | int exit_status; |
| 126 | int related_pid; |
| 127 | int syscall_id; |
| 128 | enum target_waitkind kind; |
| 129 | |
| 130 | do |
| 131 | { |
| 132 | set_sigint_trap (); /* Causes SIGINT to be passed on to the |
| 133 | attached process. */ |
| 134 | set_sigio_trap (); |
| 135 | |
| 136 | pid = ptrace_wait (inferior_pid, &status); |
| 137 | |
| 138 | save_errno = errno; |
| 139 | |
| 140 | clear_sigio_trap (); |
| 141 | |
| 142 | clear_sigint_trap (); |
| 143 | |
| 144 | if (pid == -1) |
| 145 | { |
| 146 | if (save_errno == EINTR) |
| 147 | continue; |
| 148 | |
| 149 | fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", |
| 150 | safe_strerror (save_errno)); |
| 151 | |
| 152 | /* Claim it exited with unknown signal. */ |
| 153 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 154 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; |
| 155 | return -1; |
| 156 | } |
| 157 | |
| 158 | /* Did it exit? |
| 159 | */ |
| 160 | if (target_has_exited (pid, status, &exit_status)) |
| 161 | { |
| 162 | /* ??rehrauer: For now, ignore this. */ |
| 163 | continue; |
| 164 | } |
| 165 | |
| 166 | if (!target_thread_alive (pid)) |
| 167 | { |
| 168 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; |
| 169 | return pid; |
| 170 | } |
| 171 | |
| 172 | if (target_has_forked (pid, &related_pid) |
| 173 | && ((pid == inferior_pid) || (related_pid == inferior_pid))) |
| 174 | { |
| 175 | ourstatus->kind = TARGET_WAITKIND_FORKED; |
| 176 | ourstatus->value.related_pid = related_pid; |
| 177 | return pid; |
| 178 | } |
| 179 | |
| 180 | if (target_has_vforked (pid, &related_pid) |
| 181 | && ((pid == inferior_pid) || (related_pid == inferior_pid))) |
| 182 | { |
| 183 | ourstatus->kind = TARGET_WAITKIND_VFORKED; |
| 184 | ourstatus->value.related_pid = related_pid; |
| 185 | return pid; |
| 186 | } |
| 187 | |
| 188 | if (target_has_execd (pid, &execd_pathname)) |
| 189 | { |
| 190 | /* Are we ignoring initial exec events? (This is likely because |
| 191 | we're in the process of starting up the inferior, and another |
| 192 | (older) mechanism handles those.) If so, we'll report this |
| 193 | as a regular stop, not an exec. |
| 194 | */ |
| 195 | if (inferior_ignoring_startup_exec_events) |
| 196 | { |
| 197 | inferior_ignoring_startup_exec_events--; |
| 198 | } |
| 199 | else |
| 200 | { |
| 201 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
| 202 | ourstatus->value.execd_pathname = execd_pathname; |
| 203 | return pid; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | /* All we must do with these is communicate their occurrence |
| 208 | to wait_for_inferior... |
| 209 | */ |
| 210 | if (target_has_syscall_event (pid, &kind, &syscall_id)) |
| 211 | { |
| 212 | ourstatus->kind = kind; |
| 213 | ourstatus->value.syscall_id = syscall_id; |
| 214 | return pid; |
| 215 | } |
| 216 | |
| 217 | /*## } while (pid != inferior_pid); ## *//* Some other child died or stopped */ |
| 218 | /* hack for thread testing */ |
| 219 | } |
| 220 | while ((pid != inferior_pid) && not_same_real_pid); |
| 221 | /*## */ |
| 222 | |
| 223 | store_waitstatus (ourstatus, status); |
| 224 | return pid; |
| 225 | } |
| 226 | #endif /* CHILD_WAIT */ |
| 227 | |
| 228 | #if !defined(CHILD_POST_WAIT) |
| 229 | void |
| 230 | child_post_wait (int pid, int wait_status) |
| 231 | { |
| 232 | /* This version of Unix doesn't require a meaningful "post wait" |
| 233 | operation. |
| 234 | */ |
| 235 | } |
| 236 | #endif |
| 237 | |
| 238 | |
| 239 | #ifndef CHILD_THREAD_ALIVE |
| 240 | |
| 241 | /* Check to see if the given thread is alive. |
| 242 | |
| 243 | FIXME: Is kill() ever the right way to do this? I doubt it, but |
| 244 | for now we're going to try and be compatable with the old thread |
| 245 | code. */ |
| 246 | int |
| 247 | child_thread_alive (int pid) |
| 248 | { |
| 249 | return (kill (pid, 0) != -1); |
| 250 | } |
| 251 | |
| 252 | #endif |
| 253 | |
| 254 | static void |
| 255 | child_attach_to_process (char *args, int from_tty, int after_fork) |
| 256 | { |
| 257 | if (!args) |
| 258 | error_no_arg ("process-id to attach"); |
| 259 | |
| 260 | #ifndef ATTACH_DETACH |
| 261 | error ("Can't attach to a process on this machine."); |
| 262 | #else |
| 263 | { |
| 264 | char *exec_file; |
| 265 | int pid; |
| 266 | char *dummy; |
| 267 | |
| 268 | dummy = args; |
| 269 | pid = strtol (args, &dummy, 0); |
| 270 | /* Some targets don't set errno on errors, grrr! */ |
| 271 | if ((pid == 0) && (args == dummy)) |
| 272 | error ("Illegal process-id: %s\n", args); |
| 273 | |
| 274 | if (pid == getpid ()) /* Trying to masturbate? */ |
| 275 | error ("I refuse to debug myself!"); |
| 276 | |
| 277 | if (from_tty) |
| 278 | { |
| 279 | exec_file = (char *) get_exec_file (0); |
| 280 | |
| 281 | if (after_fork) |
| 282 | printf_unfiltered ("Attaching after fork to %s\n", |
| 283 | target_pid_to_str (pid)); |
| 284 | else if (exec_file) |
| 285 | printf_unfiltered ("Attaching to program: %s, %s\n", exec_file, |
| 286 | target_pid_to_str (pid)); |
| 287 | else |
| 288 | printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid)); |
| 289 | |
| 290 | gdb_flush (gdb_stdout); |
| 291 | } |
| 292 | |
| 293 | if (!after_fork) |
| 294 | attach (pid); |
| 295 | else |
| 296 | REQUIRE_ATTACH (pid); |
| 297 | |
| 298 | inferior_pid = pid; |
| 299 | push_target (&child_ops); |
| 300 | } |
| 301 | #endif /* ATTACH_DETACH */ |
| 302 | } |
| 303 | |
| 304 | |
| 305 | /* Attach to process PID, then initialize for debugging it. */ |
| 306 | |
| 307 | static void |
| 308 | child_attach (char *args, int from_tty) |
| 309 | { |
| 310 | child_attach_to_process (args, from_tty, 0); |
| 311 | } |
| 312 | |
| 313 | #if !defined(CHILD_POST_ATTACH) |
| 314 | void |
| 315 | child_post_attach (int pid) |
| 316 | { |
| 317 | /* This version of Unix doesn't require a meaningful "post attach" |
| 318 | operation by a debugger. */ |
| 319 | } |
| 320 | #endif |
| 321 | |
| 322 | static void |
| 323 | child_require_attach (char *args, int from_tty) |
| 324 | { |
| 325 | child_attach_to_process (args, from_tty, 1); |
| 326 | } |
| 327 | |
| 328 | static void |
| 329 | child_detach_from_process (int pid, char *args, int from_tty, int after_fork) |
| 330 | { |
| 331 | #ifdef ATTACH_DETACH |
| 332 | { |
| 333 | int siggnal = 0; |
| 334 | |
| 335 | if (from_tty) |
| 336 | { |
| 337 | char *exec_file = get_exec_file (0); |
| 338 | if (exec_file == 0) |
| 339 | exec_file = ""; |
| 340 | if (after_fork) |
| 341 | printf_unfiltered ("Detaching after fork from %s\n", |
| 342 | target_pid_to_str (pid)); |
| 343 | else |
| 344 | printf_unfiltered ("Detaching from program: %s, %s\n", exec_file, |
| 345 | target_pid_to_str (pid)); |
| 346 | gdb_flush (gdb_stdout); |
| 347 | } |
| 348 | if (args) |
| 349 | siggnal = atoi (args); |
| 350 | |
| 351 | if (!after_fork) |
| 352 | detach (siggnal); |
| 353 | else |
| 354 | REQUIRE_DETACH (pid, siggnal); |
| 355 | } |
| 356 | #else |
| 357 | error ("This version of Unix does not support detaching a process."); |
| 358 | #endif |
| 359 | } |
| 360 | |
| 361 | /* Take a program previously attached to and detaches it. |
| 362 | The program resumes execution and will no longer stop |
| 363 | on signals, etc. We'd better not have left any breakpoints |
| 364 | in the program or it'll die when it hits one. For this |
| 365 | to work, it may be necessary for the process to have been |
| 366 | previously attached. It *might* work if the program was |
| 367 | started via the normal ptrace (PTRACE_TRACEME). */ |
| 368 | |
| 369 | static void |
| 370 | child_detach (char *args, int from_tty) |
| 371 | { |
| 372 | child_detach_from_process (inferior_pid, args, from_tty, 0); |
| 373 | inferior_pid = 0; |
| 374 | unpush_target (&child_ops); |
| 375 | } |
| 376 | |
| 377 | static void |
| 378 | child_require_detach (int pid, char *args, int from_tty) |
| 379 | { |
| 380 | child_detach_from_process (pid, args, from_tty, 1); |
| 381 | } |
| 382 | |
| 383 | |
| 384 | /* Get ready to modify the registers array. On machines which store |
| 385 | individual registers, this doesn't need to do anything. On machines |
| 386 | which store all the registers in one fell swoop, this makes sure |
| 387 | that registers contains all the registers from the program being |
| 388 | debugged. */ |
| 389 | |
| 390 | static void |
| 391 | child_prepare_to_store (void) |
| 392 | { |
| 393 | #ifdef CHILD_PREPARE_TO_STORE |
| 394 | CHILD_PREPARE_TO_STORE (); |
| 395 | #endif |
| 396 | } |
| 397 | |
| 398 | /* Print status information about what we're accessing. */ |
| 399 | |
| 400 | static void |
| 401 | child_files_info (struct target_ops *ignore) |
| 402 | { |
| 403 | printf_unfiltered ("\tUsing the running image of %s %s.\n", |
| 404 | attach_flag ? "attached" : "child", target_pid_to_str (inferior_pid)); |
| 405 | } |
| 406 | |
| 407 | /* ARGSUSED */ |
| 408 | static void |
| 409 | child_open (char *arg, int from_tty) |
| 410 | { |
| 411 | error ("Use the \"run\" command to start a Unix child process."); |
| 412 | } |
| 413 | |
| 414 | /* Stub function which causes the inferior that runs it, to be ptrace-able |
| 415 | by its parent process. */ |
| 416 | |
| 417 | static void |
| 418 | ptrace_me (void) |
| 419 | { |
| 420 | /* "Trace me, Dr. Memory!" */ |
| 421 | call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0); |
| 422 | } |
| 423 | |
| 424 | /* Stub function which causes the GDB that runs it, to start ptrace-ing |
| 425 | the child process. */ |
| 426 | |
| 427 | static void |
| 428 | ptrace_him (int pid) |
| 429 | { |
| 430 | push_target (&child_ops); |
| 431 | |
| 432 | /* On some targets, there must be some explicit synchronization |
| 433 | between the parent and child processes after the debugger |
| 434 | forks, and before the child execs the debuggee program. This |
| 435 | call basically gives permission for the child to exec. |
| 436 | */ |
| 437 | |
| 438 | target_acknowledge_created_inferior (pid); |
| 439 | |
| 440 | /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, |
| 441 | * and will be 1 or 2 depending on whether we're starting |
| 442 | * without or with a shell. |
| 443 | */ |
| 444 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
| 445 | |
| 446 | /* On some targets, there must be some explicit actions taken after |
| 447 | the inferior has been started up. |
| 448 | */ |
| 449 | target_post_startup_inferior (pid); |
| 450 | } |
| 451 | |
| 452 | /* Start an inferior Unix child process and sets inferior_pid to its pid. |
| 453 | EXEC_FILE is the file to run. |
| 454 | ALLARGS is a string containing the arguments to the program. |
| 455 | ENV is the environment vector to pass. Errors reported with error(). */ |
| 456 | |
| 457 | static void |
| 458 | child_create_inferior (char *exec_file, char *allargs, char **env) |
| 459 | { |
| 460 | #ifdef HPUXHPPA |
| 461 | fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, pre_fork_inferior, NULL); |
| 462 | #else |
| 463 | fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL); |
| 464 | #endif |
| 465 | /* We are at the first instruction we care about. */ |
| 466 | /* Pedal to the metal... */ |
| 467 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
| 468 | } |
| 469 | |
| 470 | #if !defined(CHILD_POST_STARTUP_INFERIOR) |
| 471 | void |
| 472 | child_post_startup_inferior (int pid) |
| 473 | { |
| 474 | /* This version of Unix doesn't require a meaningful "post startup inferior" |
| 475 | operation by a debugger. |
| 476 | */ |
| 477 | } |
| 478 | #endif |
| 479 | |
| 480 | #if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR) |
| 481 | void |
| 482 | child_acknowledge_created_inferior (int pid) |
| 483 | { |
| 484 | /* This version of Unix doesn't require a meaningful "acknowledge created inferior" |
| 485 | operation by a debugger. |
| 486 | */ |
| 487 | } |
| 488 | #endif |
| 489 | |
| 490 | |
| 491 | void |
| 492 | child_clone_and_follow_inferior (int child_pid, int *followed_child) |
| 493 | { |
| 494 | clone_and_follow_inferior (child_pid, followed_child); |
| 495 | |
| 496 | /* Don't resume CHILD_PID; it's stopped where it ought to be, until |
| 497 | the decision gets made elsewhere how to continue it. |
| 498 | */ |
| 499 | } |
| 500 | |
| 501 | |
| 502 | #if !defined(CHILD_POST_FOLLOW_INFERIOR_BY_CLONE) |
| 503 | void |
| 504 | child_post_follow_inferior_by_clone (void) |
| 505 | { |
| 506 | /* This version of Unix doesn't require a meaningful "post follow inferior" |
| 507 | operation by a clone debugger. |
| 508 | */ |
| 509 | } |
| 510 | #endif |
| 511 | |
| 512 | #if !defined(CHILD_INSERT_FORK_CATCHPOINT) |
| 513 | int |
| 514 | child_insert_fork_catchpoint (int pid) |
| 515 | { |
| 516 | /* This version of Unix doesn't support notification of fork events. */ |
| 517 | return 0; |
| 518 | } |
| 519 | #endif |
| 520 | |
| 521 | #if !defined(CHILD_REMOVE_FORK_CATCHPOINT) |
| 522 | int |
| 523 | child_remove_fork_catchpoint (int pid) |
| 524 | { |
| 525 | /* This version of Unix doesn't support notification of fork events. */ |
| 526 | return 0; |
| 527 | } |
| 528 | #endif |
| 529 | |
| 530 | #if !defined(CHILD_INSERT_VFORK_CATCHPOINT) |
| 531 | int |
| 532 | child_insert_vfork_catchpoint (int pid) |
| 533 | { |
| 534 | /* This version of Unix doesn't support notification of vfork events. */ |
| 535 | return 0; |
| 536 | } |
| 537 | #endif |
| 538 | |
| 539 | #if !defined(CHILD_REMOVE_VFORK_CATCHPOINT) |
| 540 | int |
| 541 | child_remove_vfork_catchpoint (int pid) |
| 542 | { |
| 543 | /* This version of Unix doesn't support notification of vfork events. */ |
| 544 | return 0; |
| 545 | } |
| 546 | #endif |
| 547 | |
| 548 | #if !defined(CHILD_HAS_FORKED) |
| 549 | int |
| 550 | child_has_forked (int pid, int *child_pid) |
| 551 | { |
| 552 | /* This version of Unix doesn't support notification of fork events. */ |
| 553 | return 0; |
| 554 | } |
| 555 | #endif |
| 556 | |
| 557 | |
| 558 | #if !defined(CHILD_HAS_VFORKED) |
| 559 | int |
| 560 | child_has_vforked (int pid, int *child_pid) |
| 561 | { |
| 562 | /* This version of Unix doesn't support notification of vfork events. |
| 563 | */ |
| 564 | return 0; |
| 565 | } |
| 566 | #endif |
| 567 | |
| 568 | |
| 569 | #if !defined(CHILD_CAN_FOLLOW_VFORK_PRIOR_TO_EXEC) |
| 570 | int |
| 571 | child_can_follow_vfork_prior_to_exec (void) |
| 572 | { |
| 573 | /* This version of Unix doesn't support notification of vfork events. |
| 574 | However, if it did, it probably wouldn't allow vforks to be followed |
| 575 | before the following exec. |
| 576 | */ |
| 577 | return 0; |
| 578 | } |
| 579 | #endif |
| 580 | |
| 581 | |
| 582 | #if !defined(CHILD_POST_FOLLOW_VFORK) |
| 583 | void |
| 584 | child_post_follow_vfork (int parent_pid, int followed_parent, int child_pid, |
| 585 | int followed_child) |
| 586 | { |
| 587 | /* This version of Unix doesn't require a meaningful "post follow vfork" |
| 588 | operation by a clone debugger. |
| 589 | */ |
| 590 | } |
| 591 | #endif |
| 592 | |
| 593 | #if !defined(CHILD_INSERT_EXEC_CATCHPOINT) |
| 594 | int |
| 595 | child_insert_exec_catchpoint (int pid) |
| 596 | { |
| 597 | /* This version of Unix doesn't support notification of exec events. */ |
| 598 | return 0; |
| 599 | } |
| 600 | #endif |
| 601 | |
| 602 | #if !defined(CHILD_REMOVE_EXEC_CATCHPOINT) |
| 603 | int |
| 604 | child_remove_exec_catchpoint (int pid) |
| 605 | { |
| 606 | /* This version of Unix doesn't support notification of exec events. */ |
| 607 | return 0; |
| 608 | } |
| 609 | #endif |
| 610 | |
| 611 | #if !defined(CHILD_HAS_EXECD) |
| 612 | int |
| 613 | child_has_execd (int pid, char **execd_pathname) |
| 614 | { |
| 615 | /* This version of Unix doesn't support notification of exec events. |
| 616 | */ |
| 617 | return 0; |
| 618 | } |
| 619 | #endif |
| 620 | |
| 621 | |
| 622 | #if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL) |
| 623 | int |
| 624 | child_reported_exec_events_per_exec_call (void) |
| 625 | { |
| 626 | /* This version of Unix doesn't support notification of exec events. |
| 627 | */ |
| 628 | return 1; |
| 629 | } |
| 630 | #endif |
| 631 | |
| 632 | |
| 633 | #if !defined(CHILD_HAS_SYSCALL_EVENT) |
| 634 | int |
| 635 | child_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) |
| 636 | { |
| 637 | /* This version of Unix doesn't support notification of syscall events. |
| 638 | */ |
| 639 | return 0; |
| 640 | } |
| 641 | #endif |
| 642 | |
| 643 | |
| 644 | #if !defined(CHILD_HAS_EXITED) |
| 645 | int |
| 646 | child_has_exited (int pid, int wait_status, int *exit_status) |
| 647 | { |
| 648 | if (WIFEXITED (wait_status)) |
| 649 | { |
| 650 | *exit_status = WEXITSTATUS (wait_status); |
| 651 | return 1; |
| 652 | } |
| 653 | |
| 654 | if (WIFSIGNALED (wait_status)) |
| 655 | { |
| 656 | *exit_status = 0; /* ?? Don't know what else to say here. */ |
| 657 | return 1; |
| 658 | } |
| 659 | |
| 660 | /* ?? Do we really need to consult the event state, too? Assume the |
| 661 | wait_state alone suffices. |
| 662 | */ |
| 663 | return 0; |
| 664 | } |
| 665 | #endif |
| 666 | |
| 667 | |
| 668 | static void |
| 669 | child_mourn_inferior (void) |
| 670 | { |
| 671 | unpush_target (&child_ops); |
| 672 | generic_mourn_inferior (); |
| 673 | } |
| 674 | |
| 675 | static int |
| 676 | child_can_run (void) |
| 677 | { |
| 678 | /* This variable is controlled by modules that sit atop inftarg that may layer |
| 679 | their own process structure atop that provided here. hpux-thread.c does |
| 680 | this because of the Hpux user-mode level thread model. */ |
| 681 | |
| 682 | return !child_suppress_run; |
| 683 | } |
| 684 | |
| 685 | /* Send a SIGINT to the process group. This acts just like the user typed a |
| 686 | ^C on the controlling terminal. |
| 687 | |
| 688 | XXX - This may not be correct for all systems. Some may want to use |
| 689 | killpg() instead of kill (-pgrp). */ |
| 690 | |
| 691 | static void |
| 692 | child_stop (void) |
| 693 | { |
| 694 | extern pid_t inferior_process_group; |
| 695 | |
| 696 | kill (-inferior_process_group, SIGINT); |
| 697 | } |
| 698 | |
| 699 | #if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK) |
| 700 | struct symtab_and_line * |
| 701 | child_enable_exception_callback (enum exception_event_kind kind, int enable) |
| 702 | { |
| 703 | return (struct symtab_and_line *) NULL; |
| 704 | } |
| 705 | #endif |
| 706 | |
| 707 | #if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT) |
| 708 | struct exception_event_record * |
| 709 | child_get_current_exception_event (void) |
| 710 | { |
| 711 | return (struct exception_event_record *) NULL; |
| 712 | } |
| 713 | #endif |
| 714 | |
| 715 | |
| 716 | #if !defined(CHILD_PID_TO_EXEC_FILE) |
| 717 | char * |
| 718 | child_pid_to_exec_file (int pid) |
| 719 | { |
| 720 | /* This version of Unix doesn't support translation of a process ID |
| 721 | to the filename of the executable file. |
| 722 | */ |
| 723 | return NULL; |
| 724 | } |
| 725 | #endif |
| 726 | |
| 727 | char * |
| 728 | child_core_file_to_sym_file (char *core) |
| 729 | { |
| 730 | /* The target stratum for a running executable need not support |
| 731 | this operation. |
| 732 | */ |
| 733 | return NULL; |
| 734 | } |
| 735 | \f |
| 736 | |
| 737 | #if !defined(CHILD_PID_TO_STR) |
| 738 | char * |
| 739 | child_pid_to_str (int pid) |
| 740 | { |
| 741 | return normal_pid_to_str (pid); |
| 742 | } |
| 743 | #endif |
| 744 | |
| 745 | static void |
| 746 | init_child_ops (void) |
| 747 | { |
| 748 | child_ops.to_shortname = "child"; |
| 749 | child_ops.to_longname = "Unix child process"; |
| 750 | child_ops.to_doc = "Unix child process (started by the \"run\" command)."; |
| 751 | child_ops.to_open = child_open; |
| 752 | child_ops.to_attach = child_attach; |
| 753 | child_ops.to_post_attach = child_post_attach; |
| 754 | child_ops.to_require_attach = child_require_attach; |
| 755 | child_ops.to_detach = child_detach; |
| 756 | child_ops.to_require_detach = child_require_detach; |
| 757 | child_ops.to_resume = child_resume; |
| 758 | child_ops.to_wait = child_wait; |
| 759 | child_ops.to_post_wait = child_post_wait; |
| 760 | child_ops.to_fetch_registers = fetch_inferior_registers; |
| 761 | child_ops.to_store_registers = store_inferior_registers; |
| 762 | child_ops.to_prepare_to_store = child_prepare_to_store; |
| 763 | child_ops.to_xfer_memory = child_xfer_memory; |
| 764 | child_ops.to_files_info = child_files_info; |
| 765 | child_ops.to_insert_breakpoint = memory_insert_breakpoint; |
| 766 | child_ops.to_remove_breakpoint = memory_remove_breakpoint; |
| 767 | child_ops.to_terminal_init = terminal_init_inferior; |
| 768 | child_ops.to_terminal_inferior = terminal_inferior; |
| 769 | child_ops.to_terminal_ours_for_output = terminal_ours_for_output; |
| 770 | child_ops.to_terminal_ours = terminal_ours; |
| 771 | child_ops.to_terminal_info = child_terminal_info; |
| 772 | child_ops.to_kill = kill_inferior; |
| 773 | child_ops.to_create_inferior = child_create_inferior; |
| 774 | child_ops.to_post_startup_inferior = child_post_startup_inferior; |
| 775 | child_ops.to_acknowledge_created_inferior = child_acknowledge_created_inferior; |
| 776 | child_ops.to_clone_and_follow_inferior = child_clone_and_follow_inferior; |
| 777 | child_ops.to_post_follow_inferior_by_clone = child_post_follow_inferior_by_clone; |
| 778 | child_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint; |
| 779 | child_ops.to_remove_fork_catchpoint = child_remove_fork_catchpoint; |
| 780 | child_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint; |
| 781 | child_ops.to_remove_vfork_catchpoint = child_remove_vfork_catchpoint; |
| 782 | child_ops.to_has_forked = child_has_forked; |
| 783 | child_ops.to_has_vforked = child_has_vforked; |
| 784 | child_ops.to_can_follow_vfork_prior_to_exec = child_can_follow_vfork_prior_to_exec; |
| 785 | child_ops.to_post_follow_vfork = child_post_follow_vfork; |
| 786 | child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint; |
| 787 | child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint; |
| 788 | child_ops.to_has_execd = child_has_execd; |
| 789 | child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call; |
| 790 | child_ops.to_has_syscall_event = child_has_syscall_event; |
| 791 | child_ops.to_has_exited = child_has_exited; |
| 792 | child_ops.to_mourn_inferior = child_mourn_inferior; |
| 793 | child_ops.to_can_run = child_can_run; |
| 794 | child_ops.to_thread_alive = child_thread_alive; |
| 795 | child_ops.to_pid_to_str = child_pid_to_str; |
| 796 | child_ops.to_stop = child_stop; |
| 797 | child_ops.to_enable_exception_callback = child_enable_exception_callback; |
| 798 | child_ops.to_get_current_exception_event = child_get_current_exception_event; |
| 799 | child_ops.to_pid_to_exec_file = child_pid_to_exec_file; |
| 800 | child_ops.to_core_file_to_sym_file = child_core_file_to_sym_file; |
| 801 | child_ops.to_stratum = process_stratum; |
| 802 | child_ops.to_has_all_memory = 1; |
| 803 | child_ops.to_has_memory = 1; |
| 804 | child_ops.to_has_stack = 1; |
| 805 | child_ops.to_has_registers = 1; |
| 806 | child_ops.to_has_execution = 1; |
| 807 | child_ops.to_magic = OPS_MAGIC; |
| 808 | } |
| 809 | |
| 810 | void |
| 811 | _initialize_inftarg (void) |
| 812 | { |
| 813 | #ifdef HAVE_OPTIONAL_PROC_FS |
| 814 | char procname[32]; |
| 815 | int fd; |
| 816 | |
| 817 | /* If we have an optional /proc filesystem (e.g. under OSF/1), |
| 818 | don't add ptrace support if we can access the running GDB via /proc. */ |
| 819 | #ifndef PROC_NAME_FMT |
| 820 | #define PROC_NAME_FMT "/proc/%05d" |
| 821 | #endif |
| 822 | sprintf (procname, PROC_NAME_FMT, getpid ()); |
| 823 | if ((fd = open (procname, O_RDONLY)) >= 0) |
| 824 | { |
| 825 | close (fd); |
| 826 | return; |
| 827 | } |
| 828 | #endif |
| 829 | |
| 830 | init_child_ops (); |
| 831 | add_target (&child_ops); |
| 832 | } |