| 1 | /*- |
| 2 | * This code is derived from software copyrighted by the Free Software |
| 3 | * Foundation. |
| 4 | * |
| 5 | * Modified 1991 by Donn Seeley at UUNET Technologies, Inc. |
| 6 | * Modified 1990 by Van Jacobson at Lawrence Berkeley Laboratory. |
| 7 | */ |
| 8 | |
| 9 | #ifndef lint |
| 10 | static char sccsid[] = "@(#)inflow.c 6.5 (Berkeley) 5/8/91"; |
| 11 | #endif /* not lint */ |
| 12 | |
| 13 | /* Low level interface to ptrace, for GDB when running under Unix. |
| 14 | Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc. |
| 15 | |
| 16 | This file is part of GDB. |
| 17 | |
| 18 | GDB is free software; you can redistribute it and/or modify |
| 19 | it under the terms of the GNU General Public License as published by |
| 20 | the Free Software Foundation; either version 1, or (at your option) |
| 21 | any later version. |
| 22 | |
| 23 | GDB is distributed in the hope that it will be useful, |
| 24 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 26 | GNU General Public License for more details. |
| 27 | |
| 28 | You should have received a copy of the GNU General Public License |
| 29 | along with GDB; see the file COPYING. If not, write to |
| 30 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 31 | |
| 32 | #include <stdio.h> |
| 33 | #include "defs.h" |
| 34 | #include "param.h" |
| 35 | #include "frame.h" |
| 36 | #include "inferior.h" |
| 37 | |
| 38 | #ifdef USG |
| 39 | #include <sys/types.h> |
| 40 | #endif |
| 41 | |
| 42 | /* Some USG-esque systems (some of which are BSD-esque enough so that USG |
| 43 | is not defined) want this header, and it won't do any harm. */ |
| 44 | #include <fcntl.h> |
| 45 | |
| 46 | #include <sys/param.h> |
| 47 | #include <sys/dir.h> |
| 48 | #include <signal.h> |
| 49 | |
| 50 | #ifdef HAVE_TERMIO |
| 51 | #include <termio.h> |
| 52 | #undef TIOCGETP |
| 53 | #define TIOCGETP TCGETA |
| 54 | #undef TIOCSETN |
| 55 | #define TIOCSETN TCSETA |
| 56 | #undef TIOCSETP |
| 57 | #define TIOCSETP TCSETAF |
| 58 | #define TERMINAL struct termio |
| 59 | #else |
| 60 | #include <sys/ioctl.h> |
| 61 | #include <fcntl.h> |
| 62 | #include <sgtty.h> |
| 63 | #define TERMINAL struct sgttyb |
| 64 | #endif |
| 65 | |
| 66 | #ifdef SET_STACK_LIMIT_HUGE |
| 67 | #include <sys/time.h> |
| 68 | #include <sys/resource.h> |
| 69 | extern int original_stack_limit; |
| 70 | #endif /* SET_STACK_LIMIT_HUGE */ |
| 71 | |
| 72 | extern int errno; |
| 73 | |
| 74 | /* Nonzero if we are debugging an attached outside process |
| 75 | rather than an inferior. */ |
| 76 | |
| 77 | int attach_flag; |
| 78 | |
| 79 | \f |
| 80 | /* Record terminal status separately for debugger and inferior. */ |
| 81 | |
| 82 | static TERMINAL sg_inferior; |
| 83 | static TERMINAL sg_ours; |
| 84 | |
| 85 | static int tflags_inferior; |
| 86 | static int tflags_ours; |
| 87 | |
| 88 | #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) |
| 89 | static struct tchars tc_inferior; |
| 90 | static struct tchars tc_ours; |
| 91 | #endif |
| 92 | |
| 93 | #ifdef TIOCGLTC |
| 94 | static struct ltchars ltc_inferior; |
| 95 | static struct ltchars ltc_ours; |
| 96 | #endif |
| 97 | |
| 98 | #ifdef TIOCLGET |
| 99 | static int lmode_inferior; |
| 100 | static int lmode_ours; |
| 101 | #endif |
| 102 | |
| 103 | #ifdef TIOCGPGRP |
| 104 | static int pgrp_inferior; |
| 105 | static int pgrp_ours; |
| 106 | #else |
| 107 | static int (*sigint_ours) (); |
| 108 | static int (*sigquit_ours) (); |
| 109 | #endif /* TIOCGPGRP */ |
| 110 | |
| 111 | /* Copy of inferior_io_terminal when inferior was last started. */ |
| 112 | static char *inferior_thisrun_terminal; |
| 113 | |
| 114 | static void terminal_ours_1 (); |
| 115 | |
| 116 | /* Nonzero if our terminal settings are in effect. |
| 117 | Zero if the inferior's settings are in effect. */ |
| 118 | static int terminal_is_ours; |
| 119 | |
| 120 | /* Initialize the terminal settings we record for the inferior, |
| 121 | before we actually run the inferior. */ |
| 122 | |
| 123 | void |
| 124 | terminal_init_inferior () |
| 125 | { |
| 126 | if (remote_debugging) |
| 127 | return; |
| 128 | |
| 129 | sg_inferior = sg_ours; |
| 130 | tflags_inferior = tflags_ours; |
| 131 | |
| 132 | #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) |
| 133 | tc_inferior = tc_ours; |
| 134 | #endif |
| 135 | |
| 136 | #ifdef TIOCGLTC |
| 137 | ltc_inferior = ltc_ours; |
| 138 | #endif |
| 139 | |
| 140 | #ifdef TIOCLGET |
| 141 | lmode_inferior = lmode_ours; |
| 142 | #endif |
| 143 | |
| 144 | #ifdef TIOCGPGRP |
| 145 | pgrp_inferior = inferior_pid; |
| 146 | #endif /* TIOCGPGRP */ |
| 147 | |
| 148 | terminal_is_ours = 1; |
| 149 | } |
| 150 | |
| 151 | /* Put the inferior's terminal settings into effect. |
| 152 | This is preparation for starting or resuming the inferior. */ |
| 153 | |
| 154 | void |
| 155 | terminal_inferior () |
| 156 | { |
| 157 | if (remote_debugging) |
| 158 | return; |
| 159 | |
| 160 | if (terminal_is_ours) /* && inferior_thisrun_terminal == 0) */ |
| 161 | { |
| 162 | fcntl (0, F_SETFL, tflags_inferior); |
| 163 | fcntl (0, F_SETFL, tflags_inferior); |
| 164 | ioctl (0, TIOCSETN, &sg_inferior); |
| 165 | |
| 166 | #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) |
| 167 | ioctl (0, TIOCSETC, &tc_inferior); |
| 168 | #endif |
| 169 | #ifdef TIOCGLTC |
| 170 | ioctl (0, TIOCSLTC, <c_inferior); |
| 171 | #endif |
| 172 | #ifdef TIOCLGET |
| 173 | ioctl (0, TIOCLSET, &lmode_inferior); |
| 174 | #endif |
| 175 | |
| 176 | #ifdef TIOCGPGRP |
| 177 | ioctl (0, TIOCSPGRP, &pgrp_inferior); |
| 178 | #else |
| 179 | sigint_ours = (int (*) ()) signal (SIGINT, SIG_IGN); |
| 180 | sigquit_ours = (int (*) ()) signal (SIGQUIT, SIG_IGN); |
| 181 | #endif /* TIOCGPGRP */ |
| 182 | } |
| 183 | terminal_is_ours = 0; |
| 184 | } |
| 185 | |
| 186 | /* Put some of our terminal settings into effect, |
| 187 | enough to get proper results from our output, |
| 188 | but do not change into or out of RAW mode |
| 189 | so that no input is discarded. |
| 190 | |
| 191 | After doing this, either terminal_ours or terminal_inferior |
| 192 | should be called to get back to a normal state of affairs. */ |
| 193 | |
| 194 | void |
| 195 | terminal_ours_for_output () |
| 196 | { |
| 197 | if (remote_debugging) |
| 198 | return; |
| 199 | |
| 200 | terminal_ours_1 (1); |
| 201 | } |
| 202 | |
| 203 | /* Put our terminal settings into effect. |
| 204 | First record the inferior's terminal settings |
| 205 | so they can be restored properly later. */ |
| 206 | |
| 207 | void |
| 208 | terminal_ours () |
| 209 | { |
| 210 | if (remote_debugging) |
| 211 | return; |
| 212 | |
| 213 | terminal_ours_1 (0); |
| 214 | } |
| 215 | |
| 216 | static void |
| 217 | terminal_ours_1 (output_only) |
| 218 | int output_only; |
| 219 | { |
| 220 | #ifdef TIOCGPGRP |
| 221 | /* Ignore this signal since it will happen when we try to set the pgrp. */ |
| 222 | void (*osigttou) (); |
| 223 | #endif /* TIOCGPGRP */ |
| 224 | |
| 225 | if (!terminal_is_ours) /* && inferior_thisrun_terminal == 0) */ |
| 226 | { |
| 227 | terminal_is_ours = 1; |
| 228 | |
| 229 | #ifdef TIOCGPGRP |
| 230 | osigttou = signal (SIGTTOU, SIG_IGN); |
| 231 | |
| 232 | ioctl (0, TIOCGPGRP, &pgrp_inferior); |
| 233 | ioctl (0, TIOCSPGRP, &pgrp_ours); |
| 234 | |
| 235 | signal (SIGTTOU, osigttou); |
| 236 | #else |
| 237 | signal (SIGINT, sigint_ours); |
| 238 | signal (SIGQUIT, sigquit_ours); |
| 239 | #endif /* TIOCGPGRP */ |
| 240 | |
| 241 | tflags_inferior = fcntl (0, F_GETFL, 0); |
| 242 | ioctl (0, TIOCGETP, &sg_inferior); |
| 243 | |
| 244 | #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) |
| 245 | ioctl (0, TIOCGETC, &tc_inferior); |
| 246 | #endif |
| 247 | #ifdef TIOCGLTC |
| 248 | ioctl (0, TIOCGLTC, <c_inferior); |
| 249 | #endif |
| 250 | #ifdef TIOCLGET |
| 251 | ioctl (0, TIOCLGET, &lmode_inferior); |
| 252 | #endif |
| 253 | } |
| 254 | |
| 255 | #ifdef HAVE_TERMIO |
| 256 | sg_ours.c_lflag |= ICANON; |
| 257 | if (output_only && !(sg_inferior.c_lflag & ICANON)) |
| 258 | sg_ours.c_lflag &= ~ICANON; |
| 259 | #else /* not HAVE_TERMIO */ |
| 260 | sg_ours.sg_flags &= ~RAW & ~CBREAK; |
| 261 | if (output_only) |
| 262 | sg_ours.sg_flags |= (RAW | CBREAK) & sg_inferior.sg_flags; |
| 263 | #endif /* not HAVE_TERMIO */ |
| 264 | |
| 265 | fcntl (0, F_SETFL, tflags_ours); |
| 266 | fcntl (0, F_SETFL, tflags_ours); |
| 267 | ioctl (0, TIOCSETN, &sg_ours); |
| 268 | |
| 269 | #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) |
| 270 | ioctl (0, TIOCSETC, &tc_ours); |
| 271 | #endif |
| 272 | #ifdef TIOCGLTC |
| 273 | ioctl (0, TIOCSLTC, <c_ours); |
| 274 | #endif |
| 275 | #ifdef TIOCLGET |
| 276 | ioctl (0, TIOCLSET, &lmode_ours); |
| 277 | #endif |
| 278 | |
| 279 | #ifdef HAVE_TERMIO |
| 280 | sg_ours.c_lflag |= ICANON; |
| 281 | #else /* not HAVE_TERMIO */ |
| 282 | sg_ours.sg_flags &= ~RAW & ~CBREAK; |
| 283 | #endif /* not HAVE_TERMIO */ |
| 284 | } |
| 285 | |
| 286 | static void |
| 287 | term_status_command () |
| 288 | { |
| 289 | register int i; |
| 290 | |
| 291 | if (remote_debugging) |
| 292 | { |
| 293 | printf_filtered ("No terminal status when remote debugging.\n"); |
| 294 | return; |
| 295 | } |
| 296 | |
| 297 | printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); |
| 298 | |
| 299 | #ifdef HAVE_TERMIO |
| 300 | |
| 301 | printf_filtered ("fcntl flags = 0x%x, c_iflag = 0x%x, c_oflag = 0x%x,\n", |
| 302 | tflags_inferior, sg_inferior.c_iflag, sg_inferior.c_oflag); |
| 303 | printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n", |
| 304 | sg_inferior.c_cflag, sg_inferior.c_lflag, sg_inferior.c_line); |
| 305 | printf_filtered ("c_cc: "); |
| 306 | for (i = 0; (i < NCC); i += 1) |
| 307 | printf_filtered ("0x%x ", sg_inferior.c_cc[i]); |
| 308 | printf_filtered ("\n"); |
| 309 | |
| 310 | #else /* not HAVE_TERMIO */ |
| 311 | |
| 312 | printf_filtered ("fcntl flags = 0x%x, sgttyb.sg_flags = 0x%x, owner pid = %d.\n", |
| 313 | tflags_inferior, sg_inferior.sg_flags, pgrp_inferior); |
| 314 | |
| 315 | #endif /* not HAVE_TERMIO */ |
| 316 | |
| 317 | #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) |
| 318 | printf_filtered ("tchars: "); |
| 319 | for (i = 0; i < sizeof (struct tchars); i++) |
| 320 | printf_filtered ("0x%x ", ((char *)&tc_inferior)[i]); |
| 321 | printf_filtered ("\n"); |
| 322 | #endif |
| 323 | |
| 324 | #ifdef TIOCGLTC |
| 325 | printf_filtered ("ltchars: "); |
| 326 | for (i = 0; i < sizeof (struct ltchars); i++) |
| 327 | printf_filtered ("0x%x ", ((char *)<c_inferior)[i]); |
| 328 | printf_filtered ("\n"); |
| 329 | ioctl (0, TIOCSLTC, <c_ours); |
| 330 | #endif |
| 331 | |
| 332 | #ifdef TIOCLGET |
| 333 | printf_filtered ("lmode: %x\n", lmode_inferior); |
| 334 | #endif |
| 335 | } |
| 336 | \f |
| 337 | static void |
| 338 | new_tty (ttyname) |
| 339 | char *ttyname; |
| 340 | { |
| 341 | register int tty; |
| 342 | register int fd; |
| 343 | |
| 344 | #ifdef TIOCNOTTY |
| 345 | /* Disconnect the child process from our controlling terminal. */ |
| 346 | tty = open("/dev/tty", O_RDWR); |
| 347 | if (tty > 0) |
| 348 | { |
| 349 | ioctl(tty, TIOCNOTTY, 0); |
| 350 | close(tty); |
| 351 | } |
| 352 | #endif |
| 353 | |
| 354 | /* Now open the specified new terminal. */ |
| 355 | |
| 356 | tty = open(ttyname, O_RDWR); |
| 357 | if (tty == -1) |
| 358 | _exit(1); |
| 359 | |
| 360 | /* Avoid use of dup2; doesn't exist on all systems. */ |
| 361 | if (tty != 0) |
| 362 | { close (0); dup (tty); } |
| 363 | if (tty != 1) |
| 364 | { close (1); dup (tty); } |
| 365 | if (tty != 2) |
| 366 | { close (2); dup (tty); } |
| 367 | if (tty > 2) |
| 368 | close(tty); |
| 369 | } |
| 370 | \f |
| 371 | /* Start an inferior process and returns its pid. |
| 372 | ALLARGS is a string containing shell command to run the program. |
| 373 | ENV is the environment vector to pass. */ |
| 374 | |
| 375 | #ifndef SHELL_FILE |
| 376 | #define SHELL_FILE "/bin/sh" |
| 377 | #endif |
| 378 | |
| 379 | int |
| 380 | create_inferior (allargs, env) |
| 381 | char *allargs; |
| 382 | char **env; |
| 383 | { |
| 384 | int pid; |
| 385 | char *shell_command; |
| 386 | extern int sys_nerr; |
| 387 | extern char *sys_errlist[]; |
| 388 | extern int errno; |
| 389 | |
| 390 | /* If desired, concat something onto the front of ALLARGS. |
| 391 | SHELL_COMMAND is the result. */ |
| 392 | #ifdef SHELL_COMMAND_CONCAT |
| 393 | shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + strlen (allargs) + 1); |
| 394 | strcpy (shell_command, SHELL_COMMAND_CONCAT); |
| 395 | strcat (shell_command, allargs); |
| 396 | #else |
| 397 | shell_command = allargs; |
| 398 | #endif |
| 399 | |
| 400 | /* exec is said to fail if the executable is open. */ |
| 401 | close_exec_file (); |
| 402 | |
| 403 | #if defined(USG) && !defined(HAVE_VFORK) |
| 404 | pid = fork (); |
| 405 | #else |
| 406 | pid = vfork (); |
| 407 | #endif |
| 408 | |
| 409 | if (pid < 0) |
| 410 | perror_with_name ("vfork"); |
| 411 | |
| 412 | if (pid == 0) |
| 413 | { |
| 414 | #ifdef TIOCGPGRP |
| 415 | /* Run inferior in a separate process group. */ |
| 416 | setpgrp (getpid (), getpid ()); |
| 417 | #endif /* TIOCGPGRP */ |
| 418 | |
| 419 | #ifdef SET_STACK_LIMIT_HUGE |
| 420 | /* Reset the stack limit back to what it was. */ |
| 421 | { |
| 422 | struct rlimit rlim; |
| 423 | |
| 424 | getrlimit (RLIMIT_STACK, &rlim); |
| 425 | rlim.rlim_cur = original_stack_limit; |
| 426 | setrlimit (RLIMIT_STACK, &rlim); |
| 427 | } |
| 428 | #endif /* SET_STACK_LIMIT_HUGE */ |
| 429 | |
| 430 | |
| 431 | inferior_thisrun_terminal = inferior_io_terminal; |
| 432 | if (inferior_io_terminal != 0) |
| 433 | new_tty (inferior_io_terminal); |
| 434 | |
| 435 | /* It seems that changing the signal handlers for the inferior after |
| 436 | a vfork also changes them for the superior. See comments in |
| 437 | initialize_signals for how we get the right signal handlers |
| 438 | for the inferior. */ |
| 439 | /* Not needed on Sun, at least, and loses there |
| 440 | because it clobbers the superior. */ |
| 441 | /*??? signal (SIGQUIT, SIG_DFL); |
| 442 | signal (SIGINT, SIG_DFL); */ |
| 443 | |
| 444 | call_ptrace (0); |
| 445 | execle (SHELL_FILE, "sh", "-c", shell_command, 0, env); |
| 446 | |
| 447 | fprintf (stderr, "Cannot exec %s: %s.\n", SHELL_FILE, |
| 448 | errno < sys_nerr ? sys_errlist[errno] : "unknown error"); |
| 449 | fflush (stderr); |
| 450 | _exit (0177); |
| 451 | } |
| 452 | |
| 453 | #ifdef TIOCGPGRP |
| 454 | /* Avoid race with TIOCSPGRP: guarantee that inferior's pgrp exists. */ |
| 455 | setpgrp (pid, pid); |
| 456 | #endif /* TIOCGPGRP */ |
| 457 | |
| 458 | #ifdef CREATE_INFERIOR_HOOK |
| 459 | CREATE_INFERIOR_HOOK (pid); |
| 460 | #endif |
| 461 | return pid; |
| 462 | } |
| 463 | |
| 464 | /* Kill the inferior process. Make us have no inferior. */ |
| 465 | |
| 466 | static void |
| 467 | kill_command () |
| 468 | { |
| 469 | if (remote_debugging) |
| 470 | { |
| 471 | inferior_pid = 0; |
| 472 | return; |
| 473 | } |
| 474 | if (inferior_pid == 0) |
| 475 | error ("The program is not being run."); |
| 476 | if (!query ("Kill the inferior process? ")) |
| 477 | error ("Not confirmed."); |
| 478 | kill_inferior (); |
| 479 | } |
| 480 | |
| 481 | void |
| 482 | inferior_died () |
| 483 | { |
| 484 | inferior_pid = 0; |
| 485 | attach_flag = 0; |
| 486 | mark_breakpoints_out (); |
| 487 | select_frame ((FRAME) 0, -1); |
| 488 | reopen_exec_file (); |
| 489 | if (have_core_file_p ()) |
| 490 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), |
| 491 | read_pc ())); |
| 492 | else |
| 493 | set_current_frame (0); |
| 494 | } |
| 495 | \f |
| 496 | #if 0 |
| 497 | /* This function is just for testing, and on some systems (Sony NewsOS |
| 498 | 3.2) <sys/user.h> also includes <sys/time.h> which leads to errors |
| 499 | (since on this system at least sys/time.h is not protected against |
| 500 | multiple inclusion). */ |
| 501 | static void |
| 502 | try_writing_regs_command () |
| 503 | { |
| 504 | register int i; |
| 505 | register int value; |
| 506 | extern int errno; |
| 507 | |
| 508 | if (inferior_pid == 0) |
| 509 | error ("There is no inferior process now."); |
| 510 | |
| 511 | /* A Sun 3/50 or 3/60 (at least) running SunOS 4.0.3 will have a |
| 512 | kernel panic if we try to write past the end of the user area. |
| 513 | Presumably Sun will fix this bug (it has been reported), but it |
| 514 | is tacky to crash the system, so at least on SunOS4 we need to |
| 515 | stop writing when we hit the end of the user area. */ |
| 516 | for (i = 0; i < sizeof (struct user); i += 2) |
| 517 | { |
| 518 | QUIT; |
| 519 | errno = 0; |
| 520 | value = call_ptrace (3, inferior_pid, i, 0); |
| 521 | call_ptrace (6, inferior_pid, i, value); |
| 522 | if (errno == 0) |
| 523 | { |
| 524 | printf (" Succeeded with address 0x%x; value 0x%x (%d).\n", |
| 525 | i, value, value); |
| 526 | } |
| 527 | else if ((i & 0377) == 0) |
| 528 | printf (" Failed at 0x%x.\n", i); |
| 529 | } |
| 530 | } |
| 531 | #endif |
| 532 | \f |
| 533 | void |
| 534 | _initialize_inflow () |
| 535 | { |
| 536 | add_com ("term-status", class_obscure, term_status_command, |
| 537 | "Print info on inferior's saved terminal status."); |
| 538 | |
| 539 | #if 0 |
| 540 | add_com ("try-writing-regs", class_obscure, try_writing_regs_command, |
| 541 | "Try writing all locations in inferior's system block.\n\ |
| 542 | Report which ones can be written."); |
| 543 | #endif |
| 544 | |
| 545 | add_com ("kill", class_run, kill_command, |
| 546 | "Kill execution of program being debugged."); |
| 547 | |
| 548 | inferior_pid = 0; |
| 549 | |
| 550 | ioctl (0, TIOCGETP, &sg_ours); |
| 551 | tflags_ours = fcntl (0, F_GETFL, 0); |
| 552 | |
| 553 | #if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN) |
| 554 | ioctl (0, TIOCGETC, &tc_ours); |
| 555 | #endif |
| 556 | #ifdef TIOCGLTC |
| 557 | ioctl (0, TIOCGLTC, <c_ours); |
| 558 | #endif |
| 559 | #ifdef TIOCLGET |
| 560 | ioctl (0, TIOCLGET, &lmode_ours); |
| 561 | #endif |
| 562 | |
| 563 | #ifdef TIOCGPGRP |
| 564 | ioctl (0, TIOCGPGRP, &pgrp_ours); |
| 565 | #endif /* TIOCGPGRP */ |
| 566 | |
| 567 | terminal_is_ours = 1; |
| 568 | } |
| 569 | |