| 1 | /* Fork a Unix child process, and set up to debug it, for GDB and GDBserver. |
| 2 | |
| 3 | Copyright (C) 1990-2020 Free Software Foundation, Inc. |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "gdbsupport/common-defs.h" |
| 21 | #include "fork-inferior.h" |
| 22 | #include "target/waitstatus.h" |
| 23 | #include "gdbsupport/filestuff.h" |
| 24 | #include "target/target.h" |
| 25 | #include "gdbsupport/common-inferior.h" |
| 26 | #include "gdbsupport/common-gdbthread.h" |
| 27 | #include "gdbsupport/pathstuff.h" |
| 28 | #include "gdbsupport/signals-state-save-restore.h" |
| 29 | #include "gdbsupport/gdb_tilde_expand.h" |
| 30 | #include <vector> |
| 31 | |
| 32 | extern char **environ; |
| 33 | |
| 34 | /* Build the argument vector for execv(3). */ |
| 35 | |
| 36 | class execv_argv |
| 37 | { |
| 38 | public: |
| 39 | /* EXEC_FILE is the file to run. ALLARGS is a string containing the |
| 40 | arguments to the program. If starting with a shell, SHELL_FILE |
| 41 | is the shell to run. Otherwise, SHELL_FILE is NULL. */ |
| 42 | execv_argv (const char *exec_file, const std::string &allargs, |
| 43 | const char *shell_file); |
| 44 | |
| 45 | /* Return a pointer to the built argv, in the type expected by |
| 46 | execv. The result is (only) valid for as long as this execv_argv |
| 47 | object is live. We return a "char **" because that's the type |
| 48 | that the execv functions expect. Note that it is guaranteed that |
| 49 | the execv functions do not modify the argv[] array nor the |
| 50 | strings to which the array point. */ |
| 51 | char **argv () |
| 52 | { |
| 53 | return const_cast<char **> (&m_argv[0]); |
| 54 | } |
| 55 | |
| 56 | private: |
| 57 | DISABLE_COPY_AND_ASSIGN (execv_argv); |
| 58 | |
| 59 | /* Helper methods for constructing the argument vector. */ |
| 60 | |
| 61 | /* Used when building an argv for a straight execv call, without |
| 62 | going via the shell. */ |
| 63 | void init_for_no_shell (const char *exec_file, |
| 64 | const std::string &allargs); |
| 65 | |
| 66 | /* Used when building an argv for execing a shell that execs the |
| 67 | child program. */ |
| 68 | void init_for_shell (const char *exec_file, |
| 69 | const std::string &allargs, |
| 70 | const char *shell_file); |
| 71 | |
| 72 | /* The argument vector built. Holds non-owning pointers. Elements |
| 73 | either point to the strings passed to the execv_argv ctor, or |
| 74 | inside M_STORAGE. */ |
| 75 | std::vector<const char *> m_argv; |
| 76 | |
| 77 | /* Storage. In the no-shell case, this contains a copy of the |
| 78 | arguments passed to the ctor, split by '\0'. In the shell case, |
| 79 | this contains the quoted shell command. I.e., SHELL_COMMAND in |
| 80 | {"$SHELL" "-c", SHELL_COMMAND, NULL}. */ |
| 81 | std::string m_storage; |
| 82 | }; |
| 83 | |
| 84 | /* Create argument vector for straight call to execvp. Breaks up |
| 85 | ALLARGS into an argument vector suitable for passing to execvp and |
| 86 | stores it in M_ARGV. E.g., on "run a b c d" this routine would get |
| 87 | as input the string "a b c d", and as output it would fill in |
| 88 | M_ARGV with the four arguments "a", "b", "c", "d". Each argument |
| 89 | in M_ARGV points to a substring of a copy of ALLARGS stored in |
| 90 | M_STORAGE. */ |
| 91 | |
| 92 | void |
| 93 | execv_argv::init_for_no_shell (const char *exec_file, |
| 94 | const std::string &allargs) |
| 95 | { |
| 96 | |
| 97 | /* Save/work with a copy stored in our storage. The pointers pushed |
| 98 | to M_ARGV point directly into M_STORAGE, which is modified in |
| 99 | place with the necessary NULL terminators. This avoids N heap |
| 100 | allocations and string dups when 1 is sufficient. */ |
| 101 | std::string &args_copy = m_storage = allargs; |
| 102 | |
| 103 | m_argv.push_back (exec_file); |
| 104 | |
| 105 | for (size_t cur_pos = 0; cur_pos < args_copy.size ();) |
| 106 | { |
| 107 | /* Skip whitespace-like chars. */ |
| 108 | std::size_t pos = args_copy.find_first_not_of (" \t\n", cur_pos); |
| 109 | |
| 110 | if (pos != std::string::npos) |
| 111 | cur_pos = pos; |
| 112 | |
| 113 | /* Find the position of the next separator. */ |
| 114 | std::size_t next_sep = args_copy.find_first_of (" \t\n", cur_pos); |
| 115 | |
| 116 | if (next_sep == std::string::npos) |
| 117 | { |
| 118 | /* No separator found, which means this is the last |
| 119 | argument. */ |
| 120 | next_sep = args_copy.size (); |
| 121 | } |
| 122 | else |
| 123 | { |
| 124 | /* Replace the separator with a terminator. */ |
| 125 | args_copy[next_sep++] = '\0'; |
| 126 | } |
| 127 | |
| 128 | m_argv.push_back (&args_copy[cur_pos]); |
| 129 | |
| 130 | cur_pos = next_sep; |
| 131 | } |
| 132 | |
| 133 | /* NULL-terminate the vector. */ |
| 134 | m_argv.push_back (NULL); |
| 135 | } |
| 136 | |
| 137 | /* When executing a command under the given shell, return true if the |
| 138 | '!' character should be escaped when embedded in a quoted |
| 139 | command-line argument. */ |
| 140 | |
| 141 | static bool |
| 142 | escape_bang_in_quoted_argument (const char *shell_file) |
| 143 | { |
| 144 | size_t shell_file_len = strlen (shell_file); |
| 145 | |
| 146 | /* Bang should be escaped only in C Shells. For now, simply check |
| 147 | that the shell name ends with 'csh', which covers at least csh |
| 148 | and tcsh. This should be good enough for now. */ |
| 149 | |
| 150 | if (shell_file_len < 3) |
| 151 | return false; |
| 152 | |
| 153 | if (shell_file[shell_file_len - 3] == 'c' |
| 154 | && shell_file[shell_file_len - 2] == 's' |
| 155 | && shell_file[shell_file_len - 1] == 'h') |
| 156 | return true; |
| 157 | |
| 158 | return false; |
| 159 | } |
| 160 | |
| 161 | /* See declaration. */ |
| 162 | |
| 163 | execv_argv::execv_argv (const char *exec_file, |
| 164 | const std::string &allargs, |
| 165 | const char *shell_file) |
| 166 | { |
| 167 | if (shell_file == NULL) |
| 168 | init_for_no_shell (exec_file, allargs); |
| 169 | else |
| 170 | init_for_shell (exec_file, allargs, shell_file); |
| 171 | } |
| 172 | |
| 173 | /* See declaration. */ |
| 174 | |
| 175 | void |
| 176 | execv_argv::init_for_shell (const char *exec_file, |
| 177 | const std::string &allargs, |
| 178 | const char *shell_file) |
| 179 | { |
| 180 | const char *exec_wrapper = get_exec_wrapper (); |
| 181 | |
| 182 | /* We're going to call a shell. */ |
| 183 | bool escape_bang = escape_bang_in_quoted_argument (shell_file); |
| 184 | |
| 185 | /* We need to build a new shell command string, and make argv point |
| 186 | to it. So build it in the storage. */ |
| 187 | std::string &shell_command = m_storage; |
| 188 | |
| 189 | shell_command = "exec "; |
| 190 | |
| 191 | /* Add any exec wrapper. That may be a program name with arguments, |
| 192 | so the user must handle quoting. */ |
| 193 | if (exec_wrapper != NULL) |
| 194 | { |
| 195 | shell_command += exec_wrapper; |
| 196 | shell_command += ' '; |
| 197 | } |
| 198 | |
| 199 | /* Now add exec_file, quoting as necessary. */ |
| 200 | |
| 201 | /* Quoting in this style is said to work with all shells. But csh |
| 202 | on IRIX 4.0.1 can't deal with it. So we only quote it if we need |
| 203 | to. */ |
| 204 | bool need_to_quote; |
| 205 | const char *p = exec_file; |
| 206 | while (1) |
| 207 | { |
| 208 | switch (*p) |
| 209 | { |
| 210 | case '\'': |
| 211 | case '!': |
| 212 | case '"': |
| 213 | case '(': |
| 214 | case ')': |
| 215 | case '$': |
| 216 | case '&': |
| 217 | case ';': |
| 218 | case '<': |
| 219 | case '>': |
| 220 | case ' ': |
| 221 | case '\n': |
| 222 | case '\t': |
| 223 | need_to_quote = true; |
| 224 | goto end_scan; |
| 225 | |
| 226 | case '\0': |
| 227 | need_to_quote = false; |
| 228 | goto end_scan; |
| 229 | |
| 230 | default: |
| 231 | break; |
| 232 | } |
| 233 | ++p; |
| 234 | } |
| 235 | end_scan: |
| 236 | if (need_to_quote) |
| 237 | { |
| 238 | shell_command += '\''; |
| 239 | for (p = exec_file; *p != '\0'; ++p) |
| 240 | { |
| 241 | if (*p == '\'') |
| 242 | shell_command += "'\\''"; |
| 243 | else if (*p == '!' && escape_bang) |
| 244 | shell_command += "\\!"; |
| 245 | else |
| 246 | shell_command += *p; |
| 247 | } |
| 248 | shell_command += '\''; |
| 249 | } |
| 250 | else |
| 251 | shell_command += exec_file; |
| 252 | |
| 253 | shell_command += ' ' + allargs; |
| 254 | |
| 255 | /* If we decided above to start up with a shell, we exec the shell. |
| 256 | "-c" says to interpret the next arg as a shell command to |
| 257 | execute, and this command is "exec <target-program> <args>". */ |
| 258 | m_argv.reserve (4); |
| 259 | m_argv.push_back (shell_file); |
| 260 | m_argv.push_back ("-c"); |
| 261 | m_argv.push_back (shell_command.c_str ()); |
| 262 | m_argv.push_back (NULL); |
| 263 | } |
| 264 | |
| 265 | /* See nat/fork-inferior.h. */ |
| 266 | |
| 267 | pid_t |
| 268 | fork_inferior (const char *exec_file_arg, const std::string &allargs, |
| 269 | char **env, void (*traceme_fun) (), |
| 270 | gdb::function_view<void (int)> init_trace_fun, |
| 271 | void (*pre_trace_fun) (), |
| 272 | const char *shell_file_arg, |
| 273 | void (*exec_fun)(const char *file, char * const *argv, |
| 274 | char * const *env)) |
| 275 | { |
| 276 | pid_t pid; |
| 277 | /* Set debug_fork then attach to the child while it sleeps, to debug. */ |
| 278 | int debug_fork = 0; |
| 279 | const char *shell_file; |
| 280 | const char *exec_file; |
| 281 | char **save_our_env; |
| 282 | int i; |
| 283 | int save_errno; |
| 284 | const char *inferior_cwd; |
| 285 | std::string expanded_inferior_cwd; |
| 286 | |
| 287 | /* If no exec file handed to us, get it from the exec-file command |
| 288 | -- with a good, common error message if none is specified. */ |
| 289 | if (exec_file_arg == NULL) |
| 290 | exec_file = get_exec_file (1); |
| 291 | else |
| 292 | exec_file = exec_file_arg; |
| 293 | |
| 294 | /* 'startup_with_shell' is declared in inferior.h and bound to the |
| 295 | "set startup-with-shell" option. If 0, we'll just do a |
| 296 | fork/exec, no shell, so don't bother figuring out what shell. */ |
| 297 | if (startup_with_shell) |
| 298 | { |
| 299 | shell_file = shell_file_arg; |
| 300 | |
| 301 | /* Figure out what shell to start up the user program under. */ |
| 302 | if (shell_file == NULL) |
| 303 | shell_file = get_shell (); |
| 304 | |
| 305 | gdb_assert (shell_file != NULL); |
| 306 | } |
| 307 | else |
| 308 | shell_file = NULL; |
| 309 | |
| 310 | /* Build the argument vector. */ |
| 311 | execv_argv child_argv (exec_file, allargs, shell_file); |
| 312 | |
| 313 | /* Retain a copy of our environment variables, since the child will |
| 314 | replace the value of environ and if we're vforked, we have to |
| 315 | restore it. */ |
| 316 | save_our_env = environ; |
| 317 | |
| 318 | /* Perform any necessary actions regarding to TTY before the |
| 319 | fork/vfork call. */ |
| 320 | prefork_hook (allargs.c_str ()); |
| 321 | |
| 322 | /* It is generally good practice to flush any possible pending stdio |
| 323 | output prior to doing a fork, to avoid the possibility of both |
| 324 | the parent and child flushing the same data after the fork. */ |
| 325 | gdb_flush_out_err (); |
| 326 | |
| 327 | /* Check if the user wants to set a different working directory for |
| 328 | the inferior. */ |
| 329 | inferior_cwd = get_inferior_cwd (); |
| 330 | |
| 331 | if (inferior_cwd != NULL) |
| 332 | { |
| 333 | /* Expand before forking because between fork and exec, the child |
| 334 | process may only execute async-signal-safe operations. */ |
| 335 | expanded_inferior_cwd = gdb_tilde_expand (inferior_cwd); |
| 336 | inferior_cwd = expanded_inferior_cwd.c_str (); |
| 337 | } |
| 338 | |
| 339 | /* If there's any initialization of the target layers that must |
| 340 | happen to prepare to handle the child we're about fork, do it |
| 341 | now... */ |
| 342 | if (pre_trace_fun != NULL) |
| 343 | (*pre_trace_fun) (); |
| 344 | |
| 345 | /* Create the child process. Since the child process is going to |
| 346 | exec(3) shortly afterwards, try to reduce the overhead by |
| 347 | calling vfork(2). However, if PRE_TRACE_FUN is non-null, it's |
| 348 | likely that this optimization won't work since there's too much |
| 349 | work to do between the vfork(2) and the exec(3). This is known |
| 350 | to be the case on ttrace(2)-based HP-UX, where some handshaking |
| 351 | between parent and child needs to happen between fork(2) and |
| 352 | exec(2). However, since the parent is suspended in the vforked |
| 353 | state, this doesn't work. Also note that the vfork(2) call might |
| 354 | actually be a call to fork(2) due to the fact that autoconf will |
| 355 | ``#define vfork fork'' on certain platforms. */ |
| 356 | #if !(defined(__UCLIBC__) && defined(HAS_NOMMU)) |
| 357 | if (pre_trace_fun || debug_fork) |
| 358 | pid = fork (); |
| 359 | else |
| 360 | #endif |
| 361 | pid = vfork (); |
| 362 | |
| 363 | if (pid < 0) |
| 364 | perror_with_name (("vfork")); |
| 365 | |
| 366 | if (pid == 0) |
| 367 | { |
| 368 | /* Close all file descriptors except those that gdb inherited |
| 369 | (usually 0/1/2), so they don't leak to the inferior. Note |
| 370 | that this closes the file descriptors of all secondary |
| 371 | UIs. */ |
| 372 | close_most_fds (); |
| 373 | |
| 374 | /* Change to the requested working directory if the user |
| 375 | requested it. */ |
| 376 | if (inferior_cwd != NULL) |
| 377 | { |
| 378 | if (chdir (inferior_cwd) < 0) |
| 379 | trace_start_error_with_name (inferior_cwd); |
| 380 | } |
| 381 | |
| 382 | if (debug_fork) |
| 383 | sleep (debug_fork); |
| 384 | |
| 385 | /* Execute any necessary post-fork actions before we exec. */ |
| 386 | postfork_child_hook (); |
| 387 | |
| 388 | /* Changing the signal handlers for the inferior after |
| 389 | a vfork can also change them for the superior, so we don't mess |
| 390 | with signals here. See comments in |
| 391 | initialize_signals for how we get the right signal handlers |
| 392 | for the inferior. */ |
| 393 | |
| 394 | /* "Trace me, Dr. Memory!" */ |
| 395 | (*traceme_fun) (); |
| 396 | |
| 397 | /* The call above set this process (the "child") as debuggable |
| 398 | by the original gdb process (the "parent"). Since processes |
| 399 | (unlike people) can have only one parent, if you are debugging |
| 400 | gdb itself (and your debugger is thus _already_ the |
| 401 | controller/parent for this child), code from here on out is |
| 402 | undebuggable. Indeed, you probably got an error message |
| 403 | saying "not parent". Sorry; you'll have to use print |
| 404 | statements! */ |
| 405 | |
| 406 | restore_original_signals_state (); |
| 407 | |
| 408 | /* There is no execlpe call, so we have to set the environment |
| 409 | for our child in the global variable. If we've vforked, this |
| 410 | clobbers the parent, but environ is restored a few lines down |
| 411 | in the parent. By the way, yes we do need to look down the |
| 412 | path to find $SHELL. Rich Pixley says so, and I agree. */ |
| 413 | environ = env; |
| 414 | |
| 415 | char **argv = child_argv.argv (); |
| 416 | |
| 417 | if (exec_fun != NULL) |
| 418 | (*exec_fun) (argv[0], &argv[0], env); |
| 419 | else |
| 420 | execvp (argv[0], &argv[0]); |
| 421 | |
| 422 | /* If we get here, it's an error. */ |
| 423 | save_errno = errno; |
| 424 | warning ("Cannot exec %s", argv[0]); |
| 425 | |
| 426 | for (i = 1; argv[i] != NULL; i++) |
| 427 | warning (" %s", argv[i]); |
| 428 | |
| 429 | warning ("Error: %s", safe_strerror (save_errno)); |
| 430 | |
| 431 | _exit (0177); |
| 432 | } |
| 433 | |
| 434 | /* Restore our environment in case a vforked child clob'd it. */ |
| 435 | environ = save_our_env; |
| 436 | |
| 437 | postfork_hook (pid); |
| 438 | |
| 439 | /* Now that we have a child process, make it our target, and |
| 440 | initialize anything target-vector-specific that needs |
| 441 | initializing. */ |
| 442 | if (init_trace_fun) |
| 443 | init_trace_fun (pid); |
| 444 | |
| 445 | /* We are now in the child process of interest, having exec'd the |
| 446 | correct program, and are poised at the first instruction of the |
| 447 | new program. */ |
| 448 | return pid; |
| 449 | } |
| 450 | |
| 451 | /* See nat/fork-inferior.h. */ |
| 452 | |
| 453 | ptid_t |
| 454 | startup_inferior (process_stratum_target *proc_target, pid_t pid, int ntraps, |
| 455 | struct target_waitstatus *last_waitstatus, |
| 456 | ptid_t *last_ptid) |
| 457 | { |
| 458 | int pending_execs = ntraps; |
| 459 | int terminal_initted = 0; |
| 460 | ptid_t resume_ptid; |
| 461 | |
| 462 | if (startup_with_shell) |
| 463 | { |
| 464 | /* One trap extra for exec'ing the shell. */ |
| 465 | pending_execs++; |
| 466 | } |
| 467 | |
| 468 | if (target_supports_multi_process ()) |
| 469 | resume_ptid = ptid_t (pid); |
| 470 | else |
| 471 | resume_ptid = minus_one_ptid; |
| 472 | |
| 473 | /* The process was started by the fork that created it, but it will |
| 474 | have stopped one instruction after execing the shell. Here we |
| 475 | must get it up to actual execution of the real program. */ |
| 476 | if (get_exec_wrapper () != NULL) |
| 477 | pending_execs++; |
| 478 | |
| 479 | while (1) |
| 480 | { |
| 481 | enum gdb_signal resume_signal = GDB_SIGNAL_0; |
| 482 | ptid_t event_ptid; |
| 483 | |
| 484 | struct target_waitstatus ws; |
| 485 | memset (&ws, 0, sizeof (ws)); |
| 486 | event_ptid = target_wait (resume_ptid, &ws, 0); |
| 487 | |
| 488 | if (last_waitstatus != NULL) |
| 489 | *last_waitstatus = ws; |
| 490 | if (last_ptid != NULL) |
| 491 | *last_ptid = event_ptid; |
| 492 | |
| 493 | if (ws.kind == TARGET_WAITKIND_IGNORE) |
| 494 | /* The inferior didn't really stop, keep waiting. */ |
| 495 | continue; |
| 496 | |
| 497 | switch (ws.kind) |
| 498 | { |
| 499 | case TARGET_WAITKIND_SPURIOUS: |
| 500 | case TARGET_WAITKIND_LOADED: |
| 501 | case TARGET_WAITKIND_FORKED: |
| 502 | case TARGET_WAITKIND_VFORKED: |
| 503 | case TARGET_WAITKIND_SYSCALL_ENTRY: |
| 504 | case TARGET_WAITKIND_SYSCALL_RETURN: |
| 505 | /* Ignore gracefully during startup of the inferior. */ |
| 506 | switch_to_thread (proc_target, event_ptid); |
| 507 | break; |
| 508 | |
| 509 | case TARGET_WAITKIND_SIGNALLED: |
| 510 | target_terminal::ours (); |
| 511 | target_mourn_inferior (event_ptid); |
| 512 | error (_("During startup program terminated with signal %s, %s."), |
| 513 | gdb_signal_to_name (ws.value.sig), |
| 514 | gdb_signal_to_string (ws.value.sig)); |
| 515 | return resume_ptid; |
| 516 | |
| 517 | case TARGET_WAITKIND_EXITED: |
| 518 | target_terminal::ours (); |
| 519 | target_mourn_inferior (event_ptid); |
| 520 | if (ws.value.integer) |
| 521 | error (_("During startup program exited with code %d."), |
| 522 | ws.value.integer); |
| 523 | else |
| 524 | error (_("During startup program exited normally.")); |
| 525 | return resume_ptid; |
| 526 | |
| 527 | case TARGET_WAITKIND_EXECD: |
| 528 | /* Handle EXEC signals as if they were SIGTRAP signals. */ |
| 529 | xfree (ws.value.execd_pathname); |
| 530 | resume_signal = GDB_SIGNAL_TRAP; |
| 531 | switch_to_thread (proc_target, event_ptid); |
| 532 | break; |
| 533 | |
| 534 | case TARGET_WAITKIND_STOPPED: |
| 535 | resume_signal = ws.value.sig; |
| 536 | switch_to_thread (proc_target, event_ptid); |
| 537 | break; |
| 538 | } |
| 539 | |
| 540 | if (resume_signal != GDB_SIGNAL_TRAP) |
| 541 | { |
| 542 | /* Let shell child handle its own signals in its own way. */ |
| 543 | target_continue (resume_ptid, resume_signal); |
| 544 | } |
| 545 | else |
| 546 | { |
| 547 | /* We handle SIGTRAP, however; it means child did an exec. */ |
| 548 | if (!terminal_initted) |
| 549 | { |
| 550 | /* Now that the child has exec'd we know it has already |
| 551 | set its process group. On POSIX systems, tcsetpgrp |
| 552 | will fail with EPERM if we try it before the child's |
| 553 | setpgid. */ |
| 554 | |
| 555 | /* Set up the "saved terminal modes" of the inferior |
| 556 | based on what modes we are starting it with. */ |
| 557 | target_terminal::init (); |
| 558 | |
| 559 | /* Install inferior's terminal modes. */ |
| 560 | target_terminal::inferior (); |
| 561 | |
| 562 | terminal_initted = 1; |
| 563 | } |
| 564 | |
| 565 | if (--pending_execs == 0) |
| 566 | break; |
| 567 | |
| 568 | /* Just make it go on. */ |
| 569 | target_continue_no_signal (resume_ptid); |
| 570 | } |
| 571 | } |
| 572 | |
| 573 | return resume_ptid; |
| 574 | } |
| 575 | |
| 576 | /* See nat/fork-inferior.h. */ |
| 577 | |
| 578 | void |
| 579 | trace_start_error (const char *fmt, ...) |
| 580 | { |
| 581 | va_list ap; |
| 582 | |
| 583 | va_start (ap, fmt); |
| 584 | warning ("Could not trace the inferior process."); |
| 585 | vwarning (fmt, ap); |
| 586 | va_end (ap); |
| 587 | |
| 588 | gdb_flush_out_err (); |
| 589 | _exit (0177); |
| 590 | } |
| 591 | |
| 592 | /* See nat/fork-inferior.h. */ |
| 593 | |
| 594 | void |
| 595 | trace_start_error_with_name (const char *string) |
| 596 | { |
| 597 | trace_start_error ("%s: %s", string, safe_strerror (errno)); |
| 598 | } |