| 1 | /* Target-vector operations for controlling Unix child processes, for GDB. |
| 2 | Copyright 1990, 1991, 1992 Free Software Foundation, Inc. |
| 3 | Contributed by Cygnus Support. |
| 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "frame.h" /* required by inferior.h */ |
| 23 | #include "inferior.h" |
| 24 | #include "target.h" |
| 25 | #include "wait.h" |
| 26 | #include "gdbcore.h" |
| 27 | #include "command.h" |
| 28 | #include <signal.h> |
| 29 | |
| 30 | static void |
| 31 | child_prepare_to_store PARAMS ((void)); |
| 32 | |
| 33 | #ifndef CHILD_WAIT |
| 34 | static int |
| 35 | child_wait PARAMS ((int, struct target_waitstatus *)); |
| 36 | #endif /* CHILD_WAIT */ |
| 37 | |
| 38 | static void |
| 39 | child_open PARAMS ((char *, int)); |
| 40 | |
| 41 | static void |
| 42 | child_files_info PARAMS ((struct target_ops *)); |
| 43 | |
| 44 | static void |
| 45 | child_detach PARAMS ((char *, int)); |
| 46 | |
| 47 | static void |
| 48 | child_attach PARAMS ((char *, int)); |
| 49 | |
| 50 | static void |
| 51 | ptrace_me PARAMS ((void)); |
| 52 | |
| 53 | static void |
| 54 | ptrace_him PARAMS ((int)); |
| 55 | |
| 56 | static void |
| 57 | child_create_inferior PARAMS ((char *, char *, char **)); |
| 58 | |
| 59 | static void |
| 60 | child_mourn_inferior PARAMS ((void)); |
| 61 | |
| 62 | static int |
| 63 | child_can_run PARAMS ((void)); |
| 64 | |
| 65 | extern char **environ; |
| 66 | |
| 67 | /* Forward declaration */ |
| 68 | extern struct target_ops child_ops; |
| 69 | |
| 70 | /* Convert host signal to our signals. */ |
| 71 | enum target_signal |
| 72 | target_signal_from_host (hostsig) |
| 73 | int hostsig; |
| 74 | { |
| 75 | /* A switch statement would make sense but would require special kludges |
| 76 | to deal with the cases where more than one signal has the same number. */ |
| 77 | |
| 78 | if (hostsig == 0) return TARGET_SIGNAL_0; |
| 79 | |
| 80 | #if defined (SIGHUP) |
| 81 | if (hostsig == SIGHUP) return TARGET_SIGNAL_HUP; |
| 82 | #endif |
| 83 | #if defined (SIGINT) |
| 84 | if (hostsig == SIGINT) return TARGET_SIGNAL_INT; |
| 85 | #endif |
| 86 | #if defined (SIGQUIT) |
| 87 | if (hostsig == SIGQUIT) return TARGET_SIGNAL_QUIT; |
| 88 | #endif |
| 89 | #if defined (SIGILL) |
| 90 | if (hostsig == SIGILL) return TARGET_SIGNAL_ILL; |
| 91 | #endif |
| 92 | #if defined (SIGTRAP) |
| 93 | if (hostsig == SIGTRAP) return TARGET_SIGNAL_TRAP; |
| 94 | #endif |
| 95 | #if defined (SIGABRT) |
| 96 | if (hostsig == SIGABRT) return TARGET_SIGNAL_ABRT; |
| 97 | #endif |
| 98 | #if defined (SIGEMT) |
| 99 | if (hostsig == SIGEMT) return TARGET_SIGNAL_EMT; |
| 100 | #endif |
| 101 | #if defined (SIGFPE) |
| 102 | if (hostsig == SIGFPE) return TARGET_SIGNAL_FPE; |
| 103 | #endif |
| 104 | #if defined (SIGKILL) |
| 105 | if (hostsig == SIGKILL) return TARGET_SIGNAL_KILL; |
| 106 | #endif |
| 107 | #if defined (SIGBUS) |
| 108 | if (hostsig == SIGBUS) return TARGET_SIGNAL_BUS; |
| 109 | #endif |
| 110 | #if defined (SIGSEGV) |
| 111 | if (hostsig == SIGSEGV) return TARGET_SIGNAL_SEGV; |
| 112 | #endif |
| 113 | #if defined (SIGSYS) |
| 114 | if (hostsig == SIGSYS) return TARGET_SIGNAL_SYS; |
| 115 | #endif |
| 116 | #if defined (SIGPIPE) |
| 117 | if (hostsig == SIGPIPE) return TARGET_SIGNAL_PIPE; |
| 118 | #endif |
| 119 | #if defined (SIGALRM) |
| 120 | if (hostsig == SIGALRM) return TARGET_SIGNAL_ALRM; |
| 121 | #endif |
| 122 | #if defined (SIGTERM) |
| 123 | if (hostsig == SIGTERM) return TARGET_SIGNAL_TERM; |
| 124 | #endif |
| 125 | #if defined (SIGUSR1) |
| 126 | if (hostsig == SIGUSR1) return TARGET_SIGNAL_USR1; |
| 127 | #endif |
| 128 | #if defined (SIGUSR2) |
| 129 | if (hostsig == SIGUSR2) return TARGET_SIGNAL_USR2; |
| 130 | #endif |
| 131 | #if defined (SIGCLD) |
| 132 | if (hostsig == SIGCLD) return TARGET_SIGNAL_CHLD; |
| 133 | #endif |
| 134 | #if defined (SIGCHLD) |
| 135 | if (hostsig == SIGCHLD) return TARGET_SIGNAL_CHLD; |
| 136 | #endif |
| 137 | #if defined (SIGPWR) |
| 138 | if (hostsig == SIGPWR) return TARGET_SIGNAL_PWR; |
| 139 | #endif |
| 140 | #if defined (SIGWINCH) |
| 141 | if (hostsig == SIGWINCH) return TARGET_SIGNAL_WINCH; |
| 142 | #endif |
| 143 | #if defined (SIGURG) |
| 144 | if (hostsig == SIGURG) return TARGET_SIGNAL_URG; |
| 145 | #endif |
| 146 | #if defined (SIGIO) |
| 147 | if (hostsig == SIGIO) return TARGET_SIGNAL_IO; |
| 148 | #endif |
| 149 | #if defined (SIGPOLL) |
| 150 | if (hostsig == SIGPOLL) return TARGET_SIGNAL_POLL; |
| 151 | #endif |
| 152 | #if defined (SIGSTOP) |
| 153 | if (hostsig == SIGSTOP) return TARGET_SIGNAL_STOP; |
| 154 | #endif |
| 155 | #if defined (SIGTSTP) |
| 156 | if (hostsig == SIGTSTP) return TARGET_SIGNAL_TSTP; |
| 157 | #endif |
| 158 | #if defined (SIGCONT) |
| 159 | if (hostsig == SIGCONT) return TARGET_SIGNAL_CONT; |
| 160 | #endif |
| 161 | #if defined (SIGTTIN) |
| 162 | if (hostsig == SIGTTIN) return TARGET_SIGNAL_TTIN; |
| 163 | #endif |
| 164 | #if defined (SIGTTOU) |
| 165 | if (hostsig == SIGTTOU) return TARGET_SIGNAL_TTOU; |
| 166 | #endif |
| 167 | #if defined (SIGVTALRM) |
| 168 | if (hostsig == SIGVTALRM) return TARGET_SIGNAL_VTALRM; |
| 169 | #endif |
| 170 | #if defined (SIGPROF) |
| 171 | if (hostsig == SIGPROF) return TARGET_SIGNAL_PROF; |
| 172 | #endif |
| 173 | #if defined (SIGXCPU) |
| 174 | if (hostsig == SIGXCPU) return TARGET_SIGNAL_XCPU; |
| 175 | #endif |
| 176 | #if defined (SIGXFSZ) |
| 177 | if (hostsig == SIGXFSZ) return TARGET_SIGNAL_XFSZ; |
| 178 | #endif |
| 179 | #if defined (SIGWIND) |
| 180 | if (hostsig == SIGWIND) return TARGET_SIGNAL_WIND; |
| 181 | #endif |
| 182 | #if defined (SIGPHONE) |
| 183 | if (hostsig == SIGPHONE) return TARGET_SIGNAL_PHONE; |
| 184 | #endif |
| 185 | #if defined (SIGLOST) |
| 186 | if (hostsig == SIGLOST) return TARGET_SIGNAL_LOST; |
| 187 | #endif |
| 188 | #if defined (SIGWAITING) |
| 189 | if (hostsig == SIGWAITING) return TARGET_SIGNAL_WAITING; |
| 190 | #endif |
| 191 | #if defined (SIGLWP) |
| 192 | if (hostsig == SIGLWP) return TARGET_SIGNAL_LWP; |
| 193 | #endif |
| 194 | #if defined (SIGDANGER) |
| 195 | if (hostsig == SIGDANGER) return TARGET_SIGNAL_DANGER; |
| 196 | #endif |
| 197 | #if defined (SIGGRANT) |
| 198 | if (hostsig == SIGGRANT) return TARGET_SIGNAL_GRANT; |
| 199 | #endif |
| 200 | #if defined (SIGRETRACT) |
| 201 | if (hostsig == SIGRETRACT) return TARGET_SIGNAL_RETRACT; |
| 202 | #endif |
| 203 | #if defined (SIGMSG) |
| 204 | if (hostsig == SIGMSG) return TARGET_SIGNAL_MSG; |
| 205 | #endif |
| 206 | #if defined (SIGSOUND) |
| 207 | if (hostsig == SIGSOUND) return TARGET_SIGNAL_SOUND; |
| 208 | #endif |
| 209 | #if defined (SIGSAK) |
| 210 | if (hostsig == SIGSAK) return TARGET_SIGNAL_SAK; |
| 211 | #endif |
| 212 | return TARGET_SIGNAL_UNKNOWN; |
| 213 | } |
| 214 | |
| 215 | int |
| 216 | target_signal_to_host (oursig) |
| 217 | enum target_signal oursig; |
| 218 | { |
| 219 | switch (oursig) |
| 220 | { |
| 221 | case TARGET_SIGNAL_0: return 0; |
| 222 | |
| 223 | #if defined (SIGHUP) |
| 224 | case TARGET_SIGNAL_HUP: return SIGHUP; |
| 225 | #endif |
| 226 | #if defined (SIGINT) |
| 227 | case TARGET_SIGNAL_INT: return SIGINT; |
| 228 | #endif |
| 229 | #if defined (SIGQUIT) |
| 230 | case TARGET_SIGNAL_QUIT: return SIGQUIT; |
| 231 | #endif |
| 232 | #if defined (SIGILL) |
| 233 | case TARGET_SIGNAL_ILL: return SIGILL; |
| 234 | #endif |
| 235 | #if defined (SIGTRAP) |
| 236 | case TARGET_SIGNAL_TRAP: return SIGTRAP; |
| 237 | #endif |
| 238 | #if defined (SIGABRT) |
| 239 | case TARGET_SIGNAL_ABRT: return SIGABRT; |
| 240 | #endif |
| 241 | #if defined (SIGEMT) |
| 242 | case TARGET_SIGNAL_EMT: return SIGEMT; |
| 243 | #endif |
| 244 | #if defined (SIGFPE) |
| 245 | case TARGET_SIGNAL_FPE: return SIGFPE; |
| 246 | #endif |
| 247 | #if defined (SIGKILL) |
| 248 | case TARGET_SIGNAL_KILL: return SIGKILL; |
| 249 | #endif |
| 250 | #if defined (SIGBUS) |
| 251 | case TARGET_SIGNAL_BUS: return SIGBUS; |
| 252 | #endif |
| 253 | #if defined (SIGSEGV) |
| 254 | case TARGET_SIGNAL_SEGV: return SIGSEGV; |
| 255 | #endif |
| 256 | #if defined (SIGSYS) |
| 257 | case TARGET_SIGNAL_SYS: return SIGSYS; |
| 258 | #endif |
| 259 | #if defined (SIGPIPE) |
| 260 | case TARGET_SIGNAL_PIPE: return SIGPIPE; |
| 261 | #endif |
| 262 | #if defined (SIGALRM) |
| 263 | case TARGET_SIGNAL_ALRM: return SIGALRM; |
| 264 | #endif |
| 265 | #if defined (SIGTERM) |
| 266 | case TARGET_SIGNAL_TERM: return SIGTERM; |
| 267 | #endif |
| 268 | #if defined (SIGUSR1) |
| 269 | case TARGET_SIGNAL_USR1: return SIGUSR1; |
| 270 | #endif |
| 271 | #if defined (SIGUSR2) |
| 272 | case TARGET_SIGNAL_USR2: return SIGUSR2; |
| 273 | #endif |
| 274 | #if defined (SIGCHLD) || defined (SIGCLD) |
| 275 | case TARGET_SIGNAL_CHLD: |
| 276 | #if defined (SIGCHLD) |
| 277 | return SIGCHLD; |
| 278 | #else |
| 279 | return SIGCLD; |
| 280 | #endif |
| 281 | #endif /* SIGCLD or SIGCHLD */ |
| 282 | #if defined (SIGPWR) |
| 283 | case TARGET_SIGNAL_PWR: return SIGPWR; |
| 284 | #endif |
| 285 | #if defined (SIGWINCH) |
| 286 | case TARGET_SIGNAL_WINCH: return SIGWINCH; |
| 287 | #endif |
| 288 | #if defined (SIGURG) |
| 289 | case TARGET_SIGNAL_URG: return SIGURG; |
| 290 | #endif |
| 291 | #if defined (SIGIO) |
| 292 | case TARGET_SIGNAL_IO: return SIGIO; |
| 293 | #endif |
| 294 | #if defined (SIGPOLL) |
| 295 | case TARGET_SIGNAL_POLL: return SIGPOLL; |
| 296 | #endif |
| 297 | #if defined (SIGSTOP) |
| 298 | case TARGET_SIGNAL_STOP: return SIGSTOP; |
| 299 | #endif |
| 300 | #if defined (SIGTSTP) |
| 301 | case TARGET_SIGNAL_TSTP: return SIGTSTP; |
| 302 | #endif |
| 303 | #if defined (SIGCONT) |
| 304 | case TARGET_SIGNAL_CONT: return SIGCONT; |
| 305 | #endif |
| 306 | #if defined (SIGTTIN) |
| 307 | case TARGET_SIGNAL_TTIN: return SIGTTIN; |
| 308 | #endif |
| 309 | #if defined (SIGTTOU) |
| 310 | case TARGET_SIGNAL_TTOU: return SIGTTOU; |
| 311 | #endif |
| 312 | #if defined (SIGVTALRM) |
| 313 | case TARGET_SIGNAL_VTALRM: return SIGVTALRM; |
| 314 | #endif |
| 315 | #if defined (SIGPROF) |
| 316 | case TARGET_SIGNAL_PROF: return SIGPROF; |
| 317 | #endif |
| 318 | #if defined (SIGXCPU) |
| 319 | case TARGET_SIGNAL_XCPU: return SIGXCPU; |
| 320 | #endif |
| 321 | #if defined (SIGXFSZ) |
| 322 | case TARGET_SIGNAL_XFSZ: return SIGXFSZ; |
| 323 | #endif |
| 324 | #if defined (SIGWIND) |
| 325 | case TARGET_SIGNAL_WIND: return SIGWIND; |
| 326 | #endif |
| 327 | #if defined (SIGPHONE) |
| 328 | case TARGET_SIGNAL_PHONE: return SIGPHONE; |
| 329 | #endif |
| 330 | #if defined (SIGLOST) |
| 331 | case TARGET_SIGNAL_LOST: return SIGLOST; |
| 332 | #endif |
| 333 | #if defined (SIGWAITING) |
| 334 | case TARGET_SIGNAL_WAITING: return SIGWAITING; |
| 335 | #endif |
| 336 | #if defined (SIGLWP) |
| 337 | case TARGET_SIGNAL_LWP: return SIGLWP; |
| 338 | #endif |
| 339 | #if defined (SIGDANGER) |
| 340 | case TARGET_SIGNAL_DANGER: return SIGDANGER; |
| 341 | #endif |
| 342 | #if defined (SIGGRANT) |
| 343 | case TARGET_SIGNAL_GRANT: return SIGGRANT; |
| 344 | #endif |
| 345 | #if defined (SIGRETRACT) |
| 346 | case TARGET_SIGNAL_RETRACT: return SIGRETRACT; |
| 347 | #endif |
| 348 | #if defined (SIGMSG) |
| 349 | case TARGET_SIGNAL_MSG: return SIGMSG; |
| 350 | #endif |
| 351 | #if defined (SIGSOUND) |
| 352 | case TARGET_SIGNAL_SOUND: return SIGSOUND; |
| 353 | #endif |
| 354 | #if defined (SIGSAK) |
| 355 | case TARGET_SIGNAL_SAK: return SIGSAK; |
| 356 | #endif |
| 357 | default: |
| 358 | /* The user might be trying to do "signal SIGSAK" where this system |
| 359 | doesn't have SIGSAK. */ |
| 360 | warning ("Signal %s does not exist on this system.\n", |
| 361 | target_signal_to_name (oursig)); |
| 362 | return 0; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | /* Helper function for child_wait and the Lynx derivatives of child_wait. |
| 367 | HOSTSTATUS is the waitstatus from wait() or the equivalent; store our |
| 368 | translation of that in OURSTATUS. */ |
| 369 | void |
| 370 | store_waitstatus (ourstatus, hoststatus) |
| 371 | struct target_waitstatus *ourstatus; |
| 372 | int hoststatus; |
| 373 | { |
| 374 | if (WIFEXITED (hoststatus)) |
| 375 | { |
| 376 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
| 377 | ourstatus->value.integer = WEXITSTATUS (hoststatus); |
| 378 | } |
| 379 | else if (!WIFSTOPPED (hoststatus)) |
| 380 | { |
| 381 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 382 | ourstatus->value.sig = target_signal_from_host (WTERMSIG (hoststatus)); |
| 383 | } |
| 384 | else |
| 385 | { |
| 386 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 387 | ourstatus->value.sig = target_signal_from_host (WSTOPSIG (hoststatus)); |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | #ifndef CHILD_WAIT |
| 392 | |
| 393 | /* Wait for child to do something. Return pid of child, or -1 in case |
| 394 | of error; store status through argument pointer OURSTATUS. */ |
| 395 | |
| 396 | static int |
| 397 | child_wait (pid, ourstatus) |
| 398 | int pid; |
| 399 | struct target_waitstatus *ourstatus; |
| 400 | { |
| 401 | int save_errno; |
| 402 | int status; |
| 403 | |
| 404 | do { |
| 405 | if (attach_flag) |
| 406 | set_sigint_trap(); /* Causes SIGINT to be passed on to the |
| 407 | attached process. */ |
| 408 | pid = wait (&status); |
| 409 | save_errno = errno; |
| 410 | |
| 411 | if (attach_flag) |
| 412 | clear_sigint_trap(); |
| 413 | |
| 414 | if (pid == -1) |
| 415 | { |
| 416 | if (save_errno == EINTR) |
| 417 | continue; |
| 418 | fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n", |
| 419 | safe_strerror (save_errno)); |
| 420 | /* Claim it exited with unknown signal. */ |
| 421 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 422 | ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN; |
| 423 | return -1; |
| 424 | } |
| 425 | } while (pid != inferior_pid); /* Some other child died or stopped */ |
| 426 | store_waitstatus (ourstatus, status); |
| 427 | return pid; |
| 428 | } |
| 429 | #endif /* CHILD_WAIT */ |
| 430 | |
| 431 | /* Attach to process PID, then initialize for debugging it. */ |
| 432 | |
| 433 | static void |
| 434 | child_attach (args, from_tty) |
| 435 | char *args; |
| 436 | int from_tty; |
| 437 | { |
| 438 | if (!args) |
| 439 | error_no_arg ("process-id to attach"); |
| 440 | |
| 441 | #ifndef ATTACH_DETACH |
| 442 | error ("Can't attach to a process on this machine."); |
| 443 | #else |
| 444 | { |
| 445 | char *exec_file; |
| 446 | int pid; |
| 447 | |
| 448 | pid = atoi (args); |
| 449 | |
| 450 | if (pid == getpid()) /* Trying to masturbate? */ |
| 451 | error ("I refuse to debug myself!"); |
| 452 | |
| 453 | if (from_tty) |
| 454 | { |
| 455 | exec_file = (char *) get_exec_file (0); |
| 456 | |
| 457 | if (exec_file) |
| 458 | printf_unfiltered ("Attaching to program `%s', %s\n", exec_file, |
| 459 | target_pid_to_str (pid)); |
| 460 | else |
| 461 | printf_unfiltered ("Attaching to %s\n", target_pid_to_str (pid)); |
| 462 | |
| 463 | gdb_flush (gdb_stdout); |
| 464 | } |
| 465 | |
| 466 | attach (pid); |
| 467 | inferior_pid = pid; |
| 468 | push_target (&child_ops); |
| 469 | } |
| 470 | #endif /* ATTACH_DETACH */ |
| 471 | } |
| 472 | |
| 473 | |
| 474 | /* Take a program previously attached to and detaches it. |
| 475 | The program resumes execution and will no longer stop |
| 476 | on signals, etc. We'd better not have left any breakpoints |
| 477 | in the program or it'll die when it hits one. For this |
| 478 | to work, it may be necessary for the process to have been |
| 479 | previously attached. It *might* work if the program was |
| 480 | started via the normal ptrace (PTRACE_TRACEME). */ |
| 481 | |
| 482 | static void |
| 483 | child_detach (args, from_tty) |
| 484 | char *args; |
| 485 | int from_tty; |
| 486 | { |
| 487 | #ifdef ATTACH_DETACH |
| 488 | { |
| 489 | int siggnal = 0; |
| 490 | |
| 491 | if (from_tty) |
| 492 | { |
| 493 | char *exec_file = get_exec_file (0); |
| 494 | if (exec_file == 0) |
| 495 | exec_file = ""; |
| 496 | printf_unfiltered ("Detaching from program: %s %s\n", exec_file, |
| 497 | target_pid_to_str (inferior_pid)); |
| 498 | gdb_flush (gdb_stdout); |
| 499 | } |
| 500 | if (args) |
| 501 | siggnal = atoi (args); |
| 502 | |
| 503 | detach (siggnal); |
| 504 | inferior_pid = 0; |
| 505 | unpush_target (&child_ops); |
| 506 | } |
| 507 | #else |
| 508 | error ("This version of Unix does not support detaching a process."); |
| 509 | #endif |
| 510 | } |
| 511 | |
| 512 | /* Get ready to modify the registers array. On machines which store |
| 513 | individual registers, this doesn't need to do anything. On machines |
| 514 | which store all the registers in one fell swoop, this makes sure |
| 515 | that registers contains all the registers from the program being |
| 516 | debugged. */ |
| 517 | |
| 518 | static void |
| 519 | child_prepare_to_store () |
| 520 | { |
| 521 | #ifdef CHILD_PREPARE_TO_STORE |
| 522 | CHILD_PREPARE_TO_STORE (); |
| 523 | #endif |
| 524 | } |
| 525 | |
| 526 | /* Print status information about what we're accessing. */ |
| 527 | |
| 528 | static void |
| 529 | child_files_info (ignore) |
| 530 | struct target_ops *ignore; |
| 531 | { |
| 532 | printf_unfiltered ("\tUsing the running image of %s %s.\n", |
| 533 | attach_flag? "attached": "child", target_pid_to_str (inferior_pid)); |
| 534 | } |
| 535 | |
| 536 | /* ARGSUSED */ |
| 537 | static void |
| 538 | child_open (arg, from_tty) |
| 539 | char *arg; |
| 540 | int from_tty; |
| 541 | { |
| 542 | error ("Use the \"run\" command to start a Unix child process."); |
| 543 | } |
| 544 | |
| 545 | /* Stub function which causes the inferior that runs it, to be ptrace-able |
| 546 | by its parent process. */ |
| 547 | |
| 548 | static void |
| 549 | ptrace_me () |
| 550 | { |
| 551 | /* "Trace me, Dr. Memory!" */ |
| 552 | call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0); |
| 553 | } |
| 554 | |
| 555 | /* Stub function which causes the GDB that runs it, to start ptrace-ing |
| 556 | the child process. */ |
| 557 | |
| 558 | static void |
| 559 | ptrace_him (pid) |
| 560 | int pid; |
| 561 | { |
| 562 | push_target (&child_ops); |
| 563 | |
| 564 | #ifdef START_INFERIOR_TRAPS_EXPECTED |
| 565 | startup_inferior (START_INFERIOR_TRAPS_EXPECTED); |
| 566 | #else |
| 567 | /* One trap to exec the shell, one to exec the program being debugged. */ |
| 568 | startup_inferior (2); |
| 569 | #endif |
| 570 | } |
| 571 | |
| 572 | /* Start an inferior Unix child process and sets inferior_pid to its pid. |
| 573 | EXEC_FILE is the file to run. |
| 574 | ALLARGS is a string containing the arguments to the program. |
| 575 | ENV is the environment vector to pass. Errors reported with error(). */ |
| 576 | |
| 577 | static void |
| 578 | child_create_inferior (exec_file, allargs, env) |
| 579 | char *exec_file; |
| 580 | char *allargs; |
| 581 | char **env; |
| 582 | { |
| 583 | fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him); |
| 584 | /* We are at the first instruction we care about. */ |
| 585 | /* Pedal to the metal... */ |
| 586 | proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0); |
| 587 | } |
| 588 | |
| 589 | static void |
| 590 | child_mourn_inferior () |
| 591 | { |
| 592 | unpush_target (&child_ops); |
| 593 | generic_mourn_inferior (); |
| 594 | } |
| 595 | |
| 596 | static int |
| 597 | child_can_run () |
| 598 | { |
| 599 | return(1); |
| 600 | } |
| 601 | \f |
| 602 | struct target_ops child_ops = { |
| 603 | "child", /* to_shortname */ |
| 604 | "Unix child process", /* to_longname */ |
| 605 | "Unix child process (started by the \"run\" command).", /* to_doc */ |
| 606 | child_open, /* to_open */ |
| 607 | 0, /* to_close */ |
| 608 | child_attach, /* to_attach */ |
| 609 | child_detach, /* to_detach */ |
| 610 | child_resume, /* to_resume */ |
| 611 | child_wait, /* to_wait */ |
| 612 | fetch_inferior_registers, /* to_fetch_registers */ |
| 613 | store_inferior_registers, /* to_store_registers */ |
| 614 | child_prepare_to_store, /* to_prepare_to_store */ |
| 615 | child_xfer_memory, /* to_xfer_memory */ |
| 616 | child_files_info, /* to_files_info */ |
| 617 | memory_insert_breakpoint, /* to_insert_breakpoint */ |
| 618 | memory_remove_breakpoint, /* to_remove_breakpoint */ |
| 619 | terminal_init_inferior, /* to_terminal_init */ |
| 620 | terminal_inferior, /* to_terminal_inferior */ |
| 621 | terminal_ours_for_output, /* to_terminal_ours_for_output */ |
| 622 | terminal_ours, /* to_terminal_ours */ |
| 623 | child_terminal_info, /* to_terminal_info */ |
| 624 | kill_inferior, /* to_kill */ |
| 625 | 0, /* to_load */ |
| 626 | 0, /* to_lookup_symbol */ |
| 627 | child_create_inferior, /* to_create_inferior */ |
| 628 | child_mourn_inferior, /* to_mourn_inferior */ |
| 629 | child_can_run, /* to_can_run */ |
| 630 | 0, /* to_notice_signals */ |
| 631 | process_stratum, /* to_stratum */ |
| 632 | 0, /* to_next */ |
| 633 | 1, /* to_has_all_memory */ |
| 634 | 1, /* to_has_memory */ |
| 635 | 1, /* to_has_stack */ |
| 636 | 1, /* to_has_registers */ |
| 637 | 1, /* to_has_execution */ |
| 638 | 0, /* sections */ |
| 639 | 0, /* sections_end */ |
| 640 | OPS_MAGIC /* to_magic */ |
| 641 | }; |
| 642 | |
| 643 | void |
| 644 | _initialize_inftarg () |
| 645 | { |
| 646 | add_target (&child_ops); |
| 647 | } |