Commit | Line | Data |
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c906108c | 1 | /* Fork a Unix child process, and set up to debug it, for GDB. |
74a4fe32 | 2 | |
61baf725 | 3 | Copyright (C) 1990-2017 Free Software Foundation, Inc. |
74a4fe32 | 4 | |
c906108c SS |
5 | Contributed by Cygnus Support. |
6 | ||
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
21 | |
22 | #include "defs.h" | |
c906108c | 23 | #include "inferior.h" |
191c4426 | 24 | #include "terminal.h" |
c906108c | 25 | #include "target.h" |
03f2053f | 26 | #include "gdb_wait.h" |
74c1b268 | 27 | #include "gdb_vfork.h" |
c906108c | 28 | #include "gdbcore.h" |
c906108c | 29 | #include "gdbthread.h" |
c2d11a7d | 30 | #include "command.h" /* for dont_repeat () */ |
ccd213ac | 31 | #include "gdbcmd.h" |
a77053c2 | 32 | #include "solib.h" |
614c279d | 33 | #include "filestuff.h" |
49940788 | 34 | #include "top.h" |
f348d89a | 35 | #include "signals-state-save-restore.h" |
c906108c | 36 | #include <signal.h> |
c906108c | 37 | |
74a4fe32 | 38 | /* This just gets used as a default if we can't find SHELL. */ |
c906108c | 39 | #define SHELL_FILE "/bin/sh" |
c906108c SS |
40 | |
41 | extern char **environ; | |
42 | ||
ccd213ac DJ |
43 | static char *exec_wrapper; |
44 | ||
74a4fe32 MK |
45 | /* Break up SCRATCH into an argument vector suitable for passing to |
46 | execvp and store it in ARGV. E.g., on "run a b c d" this routine | |
47 | would get as input the string "a b c d", and as output it would | |
48 | fill in ARGV with the four arguments "a", "b", "c", "d". */ | |
49 | ||
c906108c | 50 | static void |
fba45db2 | 51 | breakup_args (char *scratch, char **argv) |
c906108c | 52 | { |
55e39473 | 53 | char *cp = scratch, *tmp; |
c906108c | 54 | |
c906108c SS |
55 | for (;;) |
56 | { | |
c906108c SS |
57 | /* Scan past leading separators */ |
58 | while (*cp == ' ' || *cp == '\t' || *cp == '\n') | |
74a4fe32 | 59 | cp++; |
c906108c | 60 | |
74a4fe32 | 61 | /* Break if at end of string. */ |
c906108c SS |
62 | if (*cp == '\0') |
63 | break; | |
64 | ||
74a4fe32 | 65 | /* Take an arg. */ |
c906108c SS |
66 | *argv++ = cp; |
67 | ||
74a4fe32 | 68 | /* Scan for next arg separator. */ |
55e39473 MS |
69 | tmp = strchr (cp, ' '); |
70 | if (tmp == NULL) | |
71 | tmp = strchr (cp, '\t'); | |
72 | if (tmp == NULL) | |
73 | tmp = strchr (cp, '\n'); | |
c906108c | 74 | |
74a4fe32 | 75 | /* No separators => end of string => break. */ |
55e39473 | 76 | if (tmp == NULL) |
c906108c | 77 | break; |
55e39473 | 78 | cp = tmp; |
c906108c | 79 | |
74a4fe32 | 80 | /* Replace the separator with a terminator. */ |
c906108c SS |
81 | *cp++ = '\0'; |
82 | } | |
83 | ||
74a4fe32 | 84 | /* Null-terminate the vector. */ |
c906108c | 85 | *argv = NULL; |
c906108c SS |
86 | } |
87 | ||
74a4fe32 MK |
88 | /* When executing a command under the given shell, return non-zero if |
89 | the '!' character should be escaped when embedded in a quoted | |
6037b830 JB |
90 | command-line argument. */ |
91 | ||
92 | static int | |
93 | escape_bang_in_quoted_argument (const char *shell_file) | |
94 | { | |
95 | const int shell_file_len = strlen (shell_file); | |
74a4fe32 | 96 | |
6037b830 JB |
97 | /* Bang should be escaped only in C Shells. For now, simply check |
98 | that the shell name ends with 'csh', which covers at least csh | |
99 | and tcsh. This should be good enough for now. */ | |
100 | ||
101 | if (shell_file_len < 3) | |
102 | return 0; | |
103 | ||
104 | if (shell_file[shell_file_len - 3] == 'c' | |
105 | && shell_file[shell_file_len - 2] == 's' | |
106 | && shell_file[shell_file_len - 1] == 'h') | |
107 | return 1; | |
108 | ||
109 | return 0; | |
110 | } | |
c906108c | 111 | |
0db8980c SDJ |
112 | /* See inferior.h. */ |
113 | ||
114 | void | |
115 | trace_start_error (const char *fmt, ...) | |
116 | { | |
117 | va_list ap; | |
118 | ||
119 | va_start (ap, fmt); | |
120 | fprintf_unfiltered (gdb_stderr, "Could not trace the inferior " | |
121 | "process.\nError: "); | |
122 | vfprintf_unfiltered (gdb_stderr, fmt, ap); | |
1b076f25 | 123 | va_end (ap); |
0db8980c SDJ |
124 | |
125 | gdb_flush (gdb_stderr); | |
126 | _exit (0177); | |
127 | } | |
128 | ||
129 | /* See inferior.h. */ | |
130 | ||
131 | void | |
132 | trace_start_error_with_name (const char *string) | |
133 | { | |
134 | trace_start_error ("%s: %s", string, safe_strerror (errno)); | |
135 | } | |
136 | ||
74a4fe32 MK |
137 | /* Start an inferior Unix child process and sets inferior_ptid to its |
138 | pid. EXEC_FILE is the file to run. ALLARGS is a string containing | |
139 | the arguments to the program. ENV is the environment vector to | |
140 | pass. SHELL_FILE is the shell file, or NULL if we should pick | |
e69860f1 | 141 | one. EXEC_FUN is the exec(2) function to use, or NULL for the default |
74a4fe32 | 142 | one. */ |
c906108c | 143 | |
74a4fe32 MK |
144 | /* This function is NOT reentrant. Some of the variables have been |
145 | made static to ensure that they survive the vfork call. */ | |
c65ecaf3 | 146 | |
136d6dae | 147 | int |
c65ecaf3 | 148 | fork_inferior (char *exec_file_arg, char *allargs, char **env, |
073063d7 | 149 | void (*traceme_fun) (void), void (*init_trace_fun) (int), |
e69860f1 TG |
150 | void (*pre_trace_fun) (void), char *shell_file_arg, |
151 | void (*exec_fun)(const char *file, char * const *argv, | |
152 | char * const *env)) | |
c906108c SS |
153 | { |
154 | int pid; | |
c906108c | 155 | static char default_shell_file[] = SHELL_FILE; |
0963b4bd | 156 | /* Set debug_fork then attach to the child while it sleeps, to debug. */ |
c906108c SS |
157 | static int debug_fork = 0; |
158 | /* This is set to the result of setpgrp, which if vforked, will be visible | |
159 | to you in the parent process. It's only used by humans for debugging. */ | |
160 | static int debug_setpgrp = 657473; | |
c65ecaf3 AC |
161 | static char *shell_file; |
162 | static char *exec_file; | |
c906108c SS |
163 | char **save_our_env; |
164 | int shell = 0; | |
c65ecaf3 | 165 | static char **argv; |
3cb3b8df | 166 | const char *inferior_io_terminal = get_inferior_io_terminal (); |
6c95b8df | 167 | struct inferior *inf; |
f877b031 TG |
168 | int i; |
169 | int save_errno; | |
49940788 | 170 | struct ui *save_ui; |
c906108c | 171 | |
74a4fe32 MK |
172 | /* If no exec file handed to us, get it from the exec-file command |
173 | -- with a good, common error message if none is specified. */ | |
c65ecaf3 | 174 | exec_file = exec_file_arg; |
c906108c SS |
175 | if (exec_file == 0) |
176 | exec_file = get_exec_file (1); | |
177 | ||
98882a26 PA |
178 | /* 'startup_with_shell' is declared in inferior.h and bound to the |
179 | "set startup-with-shell" option. If 0, we'll just do a | |
180 | fork/exec, no shell, so don't bother figuring out what shell. */ | |
c65ecaf3 | 181 | shell_file = shell_file_arg; |
98882a26 | 182 | if (startup_with_shell) |
c906108c | 183 | { |
74a4fe32 | 184 | /* Figure out what shell to start up the user program under. */ |
c906108c SS |
185 | if (shell_file == NULL) |
186 | shell_file = getenv ("SHELL"); | |
187 | if (shell_file == NULL) | |
188 | shell_file = default_shell_file; | |
189 | shell = 1; | |
190 | } | |
191 | ||
c906108c SS |
192 | if (!shell) |
193 | { | |
74a4fe32 MK |
194 | /* We're going to call execvp. Create argument vector. |
195 | Calculate an upper bound on the length of the vector by | |
196 | assuming that every other character is a separate | |
197 | argument. */ | |
198 | int argc = (strlen (allargs) + 1) / 2 + 2; | |
bb9bcb69 | 199 | |
8d749320 | 200 | argv = XALLOCAVEC (char *, argc); |
c906108c SS |
201 | argv[0] = exec_file; |
202 | breakup_args (allargs, &argv[1]); | |
c906108c SS |
203 | } |
204 | else | |
205 | { | |
74a4fe32 | 206 | /* We're going to call a shell. */ |
f877b031 TG |
207 | char *shell_command; |
208 | int len; | |
c906108c SS |
209 | char *p; |
210 | int need_to_quote; | |
6037b830 | 211 | const int escape_bang = escape_bang_in_quoted_argument (shell_file); |
c906108c | 212 | |
f877b031 TG |
213 | /* Multiplying the length of exec_file by 4 is to account for the |
214 | fact that it may expand when quoted; it is a worst-case number | |
215 | based on every character being '. */ | |
216 | len = 5 + 4 * strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop */ 12; | |
217 | if (exec_wrapper) | |
218 | len += strlen (exec_wrapper) + 1; | |
219 | ||
220 | shell_command = (char *) alloca (len); | |
221 | shell_command[0] = '\0'; | |
222 | ||
c906108c SS |
223 | strcat (shell_command, "exec "); |
224 | ||
ccd213ac DJ |
225 | /* Add any exec wrapper. That may be a program name with arguments, so |
226 | the user must handle quoting. */ | |
227 | if (exec_wrapper) | |
228 | { | |
229 | strcat (shell_command, exec_wrapper); | |
230 | strcat (shell_command, " "); | |
231 | } | |
232 | ||
233 | /* Now add exec_file, quoting as necessary. */ | |
234 | ||
74a4fe32 MK |
235 | /* Quoting in this style is said to work with all shells. But |
236 | csh on IRIX 4.0.1 can't deal with it. So we only quote it if | |
237 | we need to. */ | |
c906108c SS |
238 | p = exec_file; |
239 | while (1) | |
240 | { | |
241 | switch (*p) | |
242 | { | |
243 | case '\'': | |
d8849953 | 244 | case '!': |
c906108c SS |
245 | case '"': |
246 | case '(': | |
247 | case ')': | |
248 | case '$': | |
249 | case '&': | |
250 | case ';': | |
251 | case '<': | |
252 | case '>': | |
253 | case ' ': | |
254 | case '\n': | |
255 | case '\t': | |
256 | need_to_quote = 1; | |
257 | goto end_scan; | |
258 | ||
259 | case '\0': | |
260 | need_to_quote = 0; | |
261 | goto end_scan; | |
262 | ||
263 | default: | |
264 | break; | |
265 | } | |
266 | ++p; | |
267 | } | |
268 | end_scan: | |
269 | if (need_to_quote) | |
270 | { | |
271 | strcat (shell_command, "'"); | |
272 | for (p = exec_file; *p != '\0'; ++p) | |
273 | { | |
274 | if (*p == '\'') | |
275 | strcat (shell_command, "'\\''"); | |
6037b830 | 276 | else if (*p == '!' && escape_bang) |
d8849953 | 277 | strcat (shell_command, "\\!"); |
c906108c SS |
278 | else |
279 | strncat (shell_command, p, 1); | |
280 | } | |
281 | strcat (shell_command, "'"); | |
282 | } | |
283 | else | |
284 | strcat (shell_command, exec_file); | |
285 | ||
286 | strcat (shell_command, " "); | |
287 | strcat (shell_command, allargs); | |
f877b031 TG |
288 | |
289 | /* If we decided above to start up with a shell, we exec the | |
290 | shell, "-c" says to interpret the next arg as a shell command | |
291 | to execute, and this command is "exec <target-program> | |
292 | <args>". */ | |
293 | argv = (char **) alloca (4 * sizeof (char *)); | |
294 | argv[0] = shell_file; | |
295 | argv[1] = "-c"; | |
296 | argv[2] = shell_command; | |
297 | argv[3] = (char *) 0; | |
c906108c SS |
298 | } |
299 | ||
c906108c | 300 | /* Retain a copy of our environment variables, since the child will |
74a4fe32 | 301 | replace the value of environ and if we're vforked, we have to |
c906108c SS |
302 | restore it. */ |
303 | save_our_env = environ; | |
304 | ||
49940788 PA |
305 | /* Likewise the current UI. */ |
306 | save_ui = current_ui; | |
307 | ||
c906108c SS |
308 | /* Tell the terminal handling subsystem what tty we plan to run on; |
309 | it will just record the information for later. */ | |
c906108c SS |
310 | new_tty_prefork (inferior_io_terminal); |
311 | ||
312 | /* It is generally good practice to flush any possible pending stdio | |
74a4fe32 | 313 | output prior to doing a fork, to avoid the possibility of both |
0963b4bd | 314 | the parent and child flushing the same data after the fork. */ |
49940788 PA |
315 | gdb_flush (main_ui->m_gdb_stdout); |
316 | gdb_flush (main_ui->m_gdb_stderr); | |
c906108c | 317 | |
74a4fe32 MK |
318 | /* If there's any initialization of the target layers that must |
319 | happen to prepare to handle the child we're about fork, do it | |
320 | now... */ | |
c906108c SS |
321 | if (pre_trace_fun != NULL) |
322 | (*pre_trace_fun) (); | |
323 | ||
3919e12c | 324 | /* Create the child process. Since the child process is going to |
7a0b0196 | 325 | exec(3) shortly afterwards, try to reduce the overhead by |
3919e12c MK |
326 | calling vfork(2). However, if PRE_TRACE_FUN is non-null, it's |
327 | likely that this optimization won't work since there's too much | |
328 | work to do between the vfork(2) and the exec(3). This is known | |
329 | to be the case on ttrace(2)-based HP-UX, where some handshaking | |
330 | between parent and child needs to happen between fork(2) and | |
331 | exec(2). However, since the parent is suspended in the vforked | |
332 | state, this doesn't work. Also note that the vfork(2) call might | |
333 | actually be a call to fork(2) due to the fact that autoconf will | |
334 | ``#define vfork fork'' on certain platforms. */ | |
335 | if (pre_trace_fun || debug_fork) | |
c906108c SS |
336 | pid = fork (); |
337 | else | |
338 | pid = vfork (); | |
c906108c SS |
339 | |
340 | if (pid < 0) | |
e2e0b3e5 | 341 | perror_with_name (("vfork")); |
c906108c SS |
342 | |
343 | if (pid == 0) | |
344 | { | |
49940788 PA |
345 | /* Switch to the main UI, so that gdb_std{in/out/err} in the |
346 | child are mapped to std{in/out/err}. This makes it possible | |
347 | to use fprintf_unfiltered/warning/error/etc. in the child | |
348 | from here on. */ | |
349 | current_ui = main_ui; | |
350 | ||
351 | /* Close all file descriptors except those that gdb inherited | |
352 | (usually 0/1/2), so they don't leak to the inferior. Note | |
353 | that this closes the file descriptors of all secondary | |
354 | UIs. */ | |
614c279d TT |
355 | close_most_fds (); |
356 | ||
c906108c SS |
357 | if (debug_fork) |
358 | sleep (debug_fork); | |
359 | ||
83116857 TJB |
360 | /* Create a new session for the inferior process, if necessary. |
361 | It will also place the inferior in a separate process group. */ | |
362 | if (create_tty_session () <= 0) | |
363 | { | |
364 | /* No session was created, but we still want to run the inferior | |
365 | in a separate process group. */ | |
366 | debug_setpgrp = gdb_setpgid (); | |
367 | if (debug_setpgrp == -1) | |
9b20d036 | 368 | perror (_("setpgrp failed in child")); |
83116857 | 369 | } |
c906108c | 370 | |
74a4fe32 MK |
371 | /* Ask the tty subsystem to switch to the one we specified |
372 | earlier (or to share the current terminal, if none was | |
373 | specified). */ | |
c906108c SS |
374 | new_tty (); |
375 | ||
376 | /* Changing the signal handlers for the inferior after | |
c5aa993b JM |
377 | a vfork can also change them for the superior, so we don't mess |
378 | with signals here. See comments in | |
379 | initialize_signals for how we get the right signal handlers | |
380 | for the inferior. */ | |
c906108c | 381 | |
0963b4bd | 382 | /* "Trace me, Dr. Memory!" */ |
c906108c | 383 | (*traceme_fun) (); |
74a4fe32 | 384 | |
c906108c | 385 | /* The call above set this process (the "child") as debuggable |
74a4fe32 MK |
386 | by the original gdb process (the "parent"). Since processes |
387 | (unlike people) can have only one parent, if you are debugging | |
388 | gdb itself (and your debugger is thus _already_ the | |
389 | controller/parent for this child), code from here on out is | |
390 | undebuggable. Indeed, you probably got an error message | |
391 | saying "not parent". Sorry; you'll have to use print | |
392 | statements! */ | |
c906108c | 393 | |
f348d89a PA |
394 | restore_original_signals_state (); |
395 | ||
c906108c | 396 | /* There is no execlpe call, so we have to set the environment |
c5aa993b JM |
397 | for our child in the global variable. If we've vforked, this |
398 | clobbers the parent, but environ is restored a few lines down | |
399 | in the parent. By the way, yes we do need to look down the | |
400 | path to find $SHELL. Rich Pixley says so, and I agree. */ | |
c906108c SS |
401 | environ = env; |
402 | ||
e69860f1 TG |
403 | if (exec_fun != NULL) |
404 | (*exec_fun) (argv[0], argv, env); | |
405 | else | |
406 | execvp (argv[0], argv); | |
f877b031 TG |
407 | |
408 | /* If we get here, it's an error. */ | |
409 | save_errno = errno; | |
fe23c31f | 410 | fprintf_unfiltered (gdb_stderr, "Cannot exec %s", argv[0]); |
f877b031 TG |
411 | for (i = 1; argv[i] != NULL; i++) |
412 | fprintf_unfiltered (gdb_stderr, " %s", argv[i]); | |
413 | fprintf_unfiltered (gdb_stderr, ".\n"); | |
414 | fprintf_unfiltered (gdb_stderr, "Error: %s\n", | |
415 | safe_strerror (save_errno)); | |
416 | gdb_flush (gdb_stderr); | |
417 | _exit (0177); | |
c906108c SS |
418 | } |
419 | ||
420 | /* Restore our environment in case a vforked child clob'd it. */ | |
421 | environ = save_our_env; | |
422 | ||
49940788 PA |
423 | /* Likewise the current UI. */ |
424 | current_ui = save_ui; | |
425 | ||
d90e17a7 PA |
426 | if (!have_inferiors ()) |
427 | init_thread_list (); | |
c906108c | 428 | |
6c95b8df PA |
429 | inf = current_inferior (); |
430 | ||
431 | inferior_appeared (inf, pid); | |
7f9f62ba | 432 | |
74a4fe32 MK |
433 | /* Needed for wait_for_inferior stuff below. */ |
434 | inferior_ptid = pid_to_ptid (pid); | |
c906108c | 435 | |
191c4426 PA |
436 | new_tty_postfork (); |
437 | ||
27c9d204 PA |
438 | /* We have something that executes now. We'll be running through |
439 | the shell at this point, but the pid shouldn't change. Targets | |
440 | supporting MT should fill this task's ptid with more data as soon | |
441 | as they can. */ | |
442 | add_thread_silent (inferior_ptid); | |
443 | ||
c906108c | 444 | /* Now that we have a child process, make it our target, and |
74a4fe32 MK |
445 | initialize anything target-vector-specific that needs |
446 | initializing. */ | |
136d6dae VP |
447 | if (init_trace_fun) |
448 | (*init_trace_fun) (pid); | |
c906108c SS |
449 | |
450 | /* We are now in the child process of interest, having exec'd the | |
451 | correct program, and are poised at the first instruction of the | |
452 | new program. */ | |
136d6dae | 453 | return pid; |
c906108c SS |
454 | } |
455 | ||
c906108c SS |
456 | /* Accept NTRAPS traps from the inferior. */ |
457 | ||
458 | void | |
fba45db2 | 459 | startup_inferior (int ntraps) |
c906108c SS |
460 | { |
461 | int pending_execs = ntraps; | |
74a4fe32 | 462 | int terminal_initted = 0; |
d90e17a7 PA |
463 | ptid_t resume_ptid; |
464 | ||
98882a26 PA |
465 | if (startup_with_shell) |
466 | { | |
467 | /* One trap extra for exec'ing the shell. */ | |
468 | pending_execs++; | |
469 | } | |
470 | ||
d90e17a7 PA |
471 | if (target_supports_multi_process ()) |
472 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
473 | else | |
474 | resume_ptid = minus_one_ptid; | |
c906108c | 475 | |
74a4fe32 MK |
476 | /* The process was started by the fork that created it, but it will |
477 | have stopped one instruction after execing the shell. Here we | |
478 | must get it up to actual execution of the real program. */ | |
c906108c | 479 | |
ccd213ac DJ |
480 | if (exec_wrapper) |
481 | pending_execs++; | |
482 | ||
c906108c SS |
483 | while (1) |
484 | { | |
a493e3e2 | 485 | enum gdb_signal resume_signal = GDB_SIGNAL_0; |
2e979b94 | 486 | ptid_t event_ptid; |
3c35e65b UW |
487 | |
488 | struct target_waitstatus ws; | |
489 | memset (&ws, 0, sizeof (ws)); | |
47608cb1 | 490 | event_ptid = target_wait (resume_ptid, &ws, 0); |
3c35e65b | 491 | |
2e979b94 PA |
492 | if (ws.kind == TARGET_WAITKIND_IGNORE) |
493 | /* The inferior didn't really stop, keep waiting. */ | |
494 | continue; | |
3c35e65b UW |
495 | |
496 | switch (ws.kind) | |
497 | { | |
3c35e65b UW |
498 | case TARGET_WAITKIND_SPURIOUS: |
499 | case TARGET_WAITKIND_LOADED: | |
500 | case TARGET_WAITKIND_FORKED: | |
501 | case TARGET_WAITKIND_VFORKED: | |
502 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
503 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
504 | /* Ignore gracefully during startup of the inferior. */ | |
2e979b94 | 505 | switch_to_thread (event_ptid); |
3c35e65b UW |
506 | break; |
507 | ||
508 | case TARGET_WAITKIND_SIGNALLED: | |
509 | target_terminal_ours (); | |
7d5adfe3 | 510 | target_mourn_inferior (event_ptid); |
3c35e65b | 511 | error (_("During startup program terminated with signal %s, %s."), |
2ea28649 PA |
512 | gdb_signal_to_name (ws.value.sig), |
513 | gdb_signal_to_string (ws.value.sig)); | |
3c35e65b UW |
514 | return; |
515 | ||
516 | case TARGET_WAITKIND_EXITED: | |
517 | target_terminal_ours (); | |
7d5adfe3 | 518 | target_mourn_inferior (event_ptid); |
3c35e65b UW |
519 | if (ws.value.integer) |
520 | error (_("During startup program exited with code %d."), | |
521 | ws.value.integer); | |
522 | else | |
523 | error (_("During startup program exited normally.")); | |
524 | return; | |
525 | ||
526 | case TARGET_WAITKIND_EXECD: | |
527 | /* Handle EXEC signals as if they were SIGTRAP signals. */ | |
528 | xfree (ws.value.execd_pathname); | |
a493e3e2 | 529 | resume_signal = GDB_SIGNAL_TRAP; |
2e979b94 | 530 | switch_to_thread (event_ptid); |
3c35e65b UW |
531 | break; |
532 | ||
533 | case TARGET_WAITKIND_STOPPED: | |
534 | resume_signal = ws.value.sig; | |
2e979b94 | 535 | switch_to_thread (event_ptid); |
3c35e65b UW |
536 | break; |
537 | } | |
2020b7ab | 538 | |
a493e3e2 | 539 | if (resume_signal != GDB_SIGNAL_TRAP) |
c906108c | 540 | { |
3c35e65b | 541 | /* Let shell child handle its own signals in its own way. */ |
049a8570 | 542 | target_continue (resume_ptid, resume_signal); |
c906108c SS |
543 | } |
544 | else | |
545 | { | |
546 | /* We handle SIGTRAP, however; it means child did an exec. */ | |
547 | if (!terminal_initted) | |
548 | { | |
74a4fe32 MK |
549 | /* Now that the child has exec'd we know it has already |
550 | set its process group. On POSIX systems, tcsetpgrp | |
551 | will fail with EPERM if we try it before the child's | |
552 | setpgid. */ | |
c906108c SS |
553 | |
554 | /* Set up the "saved terminal modes" of the inferior | |
c5aa993b | 555 | based on what modes we are starting it with. */ |
c906108c SS |
556 | target_terminal_init (); |
557 | ||
558 | /* Install inferior's terminal modes. */ | |
559 | target_terminal_inferior (); | |
560 | ||
561 | terminal_initted = 1; | |
562 | } | |
563 | ||
74a4fe32 | 564 | if (--pending_execs == 0) |
c906108c SS |
565 | break; |
566 | ||
3c35e65b | 567 | /* Just make it go on. */ |
049a8570 | 568 | target_continue_no_signal (resume_ptid); |
c906108c SS |
569 | } |
570 | } | |
2e979b94 PA |
571 | |
572 | /* Mark all threads non-executing. */ | |
d90e17a7 | 573 | set_executing (resume_ptid, 0); |
c906108c | 574 | } |
ccd213ac DJ |
575 | |
576 | /* Implement the "unset exec-wrapper" command. */ | |
577 | ||
578 | static void | |
579 | unset_exec_wrapper_command (char *args, int from_tty) | |
580 | { | |
581 | xfree (exec_wrapper); | |
582 | exec_wrapper = NULL; | |
583 | } | |
584 | ||
98882a26 PA |
585 | static void |
586 | show_startup_with_shell (struct ui_file *file, int from_tty, | |
587 | struct cmd_list_element *c, const char *value) | |
588 | { | |
589 | fprintf_filtered (file, | |
590 | _("Use of shell to start subprocesses is %s.\n"), | |
591 | value); | |
592 | } | |
593 | ||
2c0b251b PA |
594 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
595 | extern initialize_file_ftype _initialize_fork_child; | |
596 | ||
ccd213ac DJ |
597 | void |
598 | _initialize_fork_child (void) | |
599 | { | |
600 | add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\ | |
601 | Set a wrapper for running programs.\n\ | |
602 | The wrapper prepares the system and environment for the new program."), | |
603 | _("\ | |
604 | Show the wrapper for running programs."), NULL, | |
605 | NULL, NULL, | |
606 | &setlist, &showlist); | |
607 | ||
608 | add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command, | |
609 | _("Disable use of an execution wrapper."), | |
610 | &unsetlist); | |
98882a26 PA |
611 | |
612 | add_setshow_boolean_cmd ("startup-with-shell", class_support, | |
613 | &startup_with_shell, _("\ | |
614 | Set use of shell to start subprocesses. The default is on."), _("\ | |
615 | Show use of shell to start subprocesses."), NULL, | |
616 | NULL, | |
617 | show_startup_with_shell, | |
618 | &setlist, &showlist); | |
ccd213ac | 619 | } |