Commit | Line | Data |
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c906108c | 1 | /* Fork a Unix child process, and set up to debug it, for GDB. |
74a4fe32 | 2 | |
618f726f | 3 | Copyright (C) 1990-2016 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 | |
74a4fe32 MK |
112 | /* Start an inferior Unix child process and sets inferior_ptid to its |
113 | pid. EXEC_FILE is the file to run. ALLARGS is a string containing | |
114 | the arguments to the program. ENV is the environment vector to | |
115 | pass. SHELL_FILE is the shell file, or NULL if we should pick | |
e69860f1 | 116 | one. EXEC_FUN is the exec(2) function to use, or NULL for the default |
74a4fe32 | 117 | one. */ |
c906108c | 118 | |
74a4fe32 MK |
119 | /* This function is NOT reentrant. Some of the variables have been |
120 | made static to ensure that they survive the vfork call. */ | |
c65ecaf3 | 121 | |
136d6dae | 122 | int |
c65ecaf3 | 123 | fork_inferior (char *exec_file_arg, char *allargs, char **env, |
073063d7 | 124 | void (*traceme_fun) (void), void (*init_trace_fun) (int), |
e69860f1 TG |
125 | void (*pre_trace_fun) (void), char *shell_file_arg, |
126 | void (*exec_fun)(const char *file, char * const *argv, | |
127 | char * const *env)) | |
c906108c SS |
128 | { |
129 | int pid; | |
c906108c | 130 | static char default_shell_file[] = SHELL_FILE; |
0963b4bd | 131 | /* Set debug_fork then attach to the child while it sleeps, to debug. */ |
c906108c SS |
132 | static int debug_fork = 0; |
133 | /* This is set to the result of setpgrp, which if vforked, will be visible | |
134 | to you in the parent process. It's only used by humans for debugging. */ | |
135 | static int debug_setpgrp = 657473; | |
c65ecaf3 AC |
136 | static char *shell_file; |
137 | static char *exec_file; | |
c906108c SS |
138 | char **save_our_env; |
139 | int shell = 0; | |
c65ecaf3 | 140 | static char **argv; |
3cb3b8df | 141 | const char *inferior_io_terminal = get_inferior_io_terminal (); |
6c95b8df | 142 | struct inferior *inf; |
f877b031 TG |
143 | int i; |
144 | int save_errno; | |
49940788 | 145 | struct ui *save_ui; |
c906108c | 146 | |
74a4fe32 MK |
147 | /* If no exec file handed to us, get it from the exec-file command |
148 | -- with a good, common error message if none is specified. */ | |
c65ecaf3 | 149 | exec_file = exec_file_arg; |
c906108c SS |
150 | if (exec_file == 0) |
151 | exec_file = get_exec_file (1); | |
152 | ||
98882a26 PA |
153 | /* 'startup_with_shell' is declared in inferior.h and bound to the |
154 | "set startup-with-shell" option. If 0, we'll just do a | |
155 | fork/exec, no shell, so don't bother figuring out what shell. */ | |
c65ecaf3 | 156 | shell_file = shell_file_arg; |
98882a26 | 157 | if (startup_with_shell) |
c906108c | 158 | { |
74a4fe32 | 159 | /* Figure out what shell to start up the user program under. */ |
c906108c SS |
160 | if (shell_file == NULL) |
161 | shell_file = getenv ("SHELL"); | |
162 | if (shell_file == NULL) | |
163 | shell_file = default_shell_file; | |
164 | shell = 1; | |
165 | } | |
166 | ||
c906108c SS |
167 | if (!shell) |
168 | { | |
74a4fe32 MK |
169 | /* We're going to call execvp. Create argument vector. |
170 | Calculate an upper bound on the length of the vector by | |
171 | assuming that every other character is a separate | |
172 | argument. */ | |
173 | int argc = (strlen (allargs) + 1) / 2 + 2; | |
bb9bcb69 | 174 | |
8d749320 | 175 | argv = XALLOCAVEC (char *, argc); |
c906108c SS |
176 | argv[0] = exec_file; |
177 | breakup_args (allargs, &argv[1]); | |
c906108c SS |
178 | } |
179 | else | |
180 | { | |
74a4fe32 | 181 | /* We're going to call a shell. */ |
f877b031 TG |
182 | char *shell_command; |
183 | int len; | |
c906108c SS |
184 | char *p; |
185 | int need_to_quote; | |
6037b830 | 186 | const int escape_bang = escape_bang_in_quoted_argument (shell_file); |
c906108c | 187 | |
f877b031 TG |
188 | /* Multiplying the length of exec_file by 4 is to account for the |
189 | fact that it may expand when quoted; it is a worst-case number | |
190 | based on every character being '. */ | |
191 | len = 5 + 4 * strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop */ 12; | |
192 | if (exec_wrapper) | |
193 | len += strlen (exec_wrapper) + 1; | |
194 | ||
195 | shell_command = (char *) alloca (len); | |
196 | shell_command[0] = '\0'; | |
197 | ||
c906108c SS |
198 | strcat (shell_command, "exec "); |
199 | ||
ccd213ac DJ |
200 | /* Add any exec wrapper. That may be a program name with arguments, so |
201 | the user must handle quoting. */ | |
202 | if (exec_wrapper) | |
203 | { | |
204 | strcat (shell_command, exec_wrapper); | |
205 | strcat (shell_command, " "); | |
206 | } | |
207 | ||
208 | /* Now add exec_file, quoting as necessary. */ | |
209 | ||
74a4fe32 MK |
210 | /* Quoting in this style is said to work with all shells. But |
211 | csh on IRIX 4.0.1 can't deal with it. So we only quote it if | |
212 | we need to. */ | |
c906108c SS |
213 | p = exec_file; |
214 | while (1) | |
215 | { | |
216 | switch (*p) | |
217 | { | |
218 | case '\'': | |
d8849953 | 219 | case '!': |
c906108c SS |
220 | case '"': |
221 | case '(': | |
222 | case ')': | |
223 | case '$': | |
224 | case '&': | |
225 | case ';': | |
226 | case '<': | |
227 | case '>': | |
228 | case ' ': | |
229 | case '\n': | |
230 | case '\t': | |
231 | need_to_quote = 1; | |
232 | goto end_scan; | |
233 | ||
234 | case '\0': | |
235 | need_to_quote = 0; | |
236 | goto end_scan; | |
237 | ||
238 | default: | |
239 | break; | |
240 | } | |
241 | ++p; | |
242 | } | |
243 | end_scan: | |
244 | if (need_to_quote) | |
245 | { | |
246 | strcat (shell_command, "'"); | |
247 | for (p = exec_file; *p != '\0'; ++p) | |
248 | { | |
249 | if (*p == '\'') | |
250 | strcat (shell_command, "'\\''"); | |
6037b830 | 251 | else if (*p == '!' && escape_bang) |
d8849953 | 252 | strcat (shell_command, "\\!"); |
c906108c SS |
253 | else |
254 | strncat (shell_command, p, 1); | |
255 | } | |
256 | strcat (shell_command, "'"); | |
257 | } | |
258 | else | |
259 | strcat (shell_command, exec_file); | |
260 | ||
261 | strcat (shell_command, " "); | |
262 | strcat (shell_command, allargs); | |
f877b031 TG |
263 | |
264 | /* If we decided above to start up with a shell, we exec the | |
265 | shell, "-c" says to interpret the next arg as a shell command | |
266 | to execute, and this command is "exec <target-program> | |
267 | <args>". */ | |
268 | argv = (char **) alloca (4 * sizeof (char *)); | |
269 | argv[0] = shell_file; | |
270 | argv[1] = "-c"; | |
271 | argv[2] = shell_command; | |
272 | argv[3] = (char *) 0; | |
c906108c SS |
273 | } |
274 | ||
c906108c | 275 | /* Retain a copy of our environment variables, since the child will |
74a4fe32 | 276 | replace the value of environ and if we're vforked, we have to |
c906108c SS |
277 | restore it. */ |
278 | save_our_env = environ; | |
279 | ||
49940788 PA |
280 | /* Likewise the current UI. */ |
281 | save_ui = current_ui; | |
282 | ||
c906108c SS |
283 | /* Tell the terminal handling subsystem what tty we plan to run on; |
284 | it will just record the information for later. */ | |
c906108c SS |
285 | new_tty_prefork (inferior_io_terminal); |
286 | ||
287 | /* It is generally good practice to flush any possible pending stdio | |
74a4fe32 | 288 | output prior to doing a fork, to avoid the possibility of both |
0963b4bd | 289 | the parent and child flushing the same data after the fork. */ |
49940788 PA |
290 | gdb_flush (main_ui->m_gdb_stdout); |
291 | gdb_flush (main_ui->m_gdb_stderr); | |
c906108c | 292 | |
74a4fe32 MK |
293 | /* If there's any initialization of the target layers that must |
294 | happen to prepare to handle the child we're about fork, do it | |
295 | now... */ | |
c906108c SS |
296 | if (pre_trace_fun != NULL) |
297 | (*pre_trace_fun) (); | |
298 | ||
3919e12c | 299 | /* Create the child process. Since the child process is going to |
7a0b0196 | 300 | exec(3) shortly afterwards, try to reduce the overhead by |
3919e12c MK |
301 | calling vfork(2). However, if PRE_TRACE_FUN is non-null, it's |
302 | likely that this optimization won't work since there's too much | |
303 | work to do between the vfork(2) and the exec(3). This is known | |
304 | to be the case on ttrace(2)-based HP-UX, where some handshaking | |
305 | between parent and child needs to happen between fork(2) and | |
306 | exec(2). However, since the parent is suspended in the vforked | |
307 | state, this doesn't work. Also note that the vfork(2) call might | |
308 | actually be a call to fork(2) due to the fact that autoconf will | |
309 | ``#define vfork fork'' on certain platforms. */ | |
310 | if (pre_trace_fun || debug_fork) | |
c906108c SS |
311 | pid = fork (); |
312 | else | |
313 | pid = vfork (); | |
c906108c SS |
314 | |
315 | if (pid < 0) | |
e2e0b3e5 | 316 | perror_with_name (("vfork")); |
c906108c SS |
317 | |
318 | if (pid == 0) | |
319 | { | |
49940788 PA |
320 | /* Switch to the main UI, so that gdb_std{in/out/err} in the |
321 | child are mapped to std{in/out/err}. This makes it possible | |
322 | to use fprintf_unfiltered/warning/error/etc. in the child | |
323 | from here on. */ | |
324 | current_ui = main_ui; | |
325 | ||
326 | /* Close all file descriptors except those that gdb inherited | |
327 | (usually 0/1/2), so they don't leak to the inferior. Note | |
328 | that this closes the file descriptors of all secondary | |
329 | UIs. */ | |
614c279d TT |
330 | close_most_fds (); |
331 | ||
c906108c SS |
332 | if (debug_fork) |
333 | sleep (debug_fork); | |
334 | ||
83116857 TJB |
335 | /* Create a new session for the inferior process, if necessary. |
336 | It will also place the inferior in a separate process group. */ | |
337 | if (create_tty_session () <= 0) | |
338 | { | |
339 | /* No session was created, but we still want to run the inferior | |
340 | in a separate process group. */ | |
341 | debug_setpgrp = gdb_setpgid (); | |
342 | if (debug_setpgrp == -1) | |
9b20d036 | 343 | perror (_("setpgrp failed in child")); |
83116857 | 344 | } |
c906108c | 345 | |
74a4fe32 MK |
346 | /* Ask the tty subsystem to switch to the one we specified |
347 | earlier (or to share the current terminal, if none was | |
348 | specified). */ | |
c906108c SS |
349 | new_tty (); |
350 | ||
351 | /* Changing the signal handlers for the inferior after | |
c5aa993b JM |
352 | a vfork can also change them for the superior, so we don't mess |
353 | with signals here. See comments in | |
354 | initialize_signals for how we get the right signal handlers | |
355 | for the inferior. */ | |
c906108c | 356 | |
0963b4bd | 357 | /* "Trace me, Dr. Memory!" */ |
c906108c | 358 | (*traceme_fun) (); |
74a4fe32 | 359 | |
c906108c | 360 | /* The call above set this process (the "child") as debuggable |
74a4fe32 MK |
361 | by the original gdb process (the "parent"). Since processes |
362 | (unlike people) can have only one parent, if you are debugging | |
363 | gdb itself (and your debugger is thus _already_ the | |
364 | controller/parent for this child), code from here on out is | |
365 | undebuggable. Indeed, you probably got an error message | |
366 | saying "not parent". Sorry; you'll have to use print | |
367 | statements! */ | |
c906108c | 368 | |
f348d89a PA |
369 | restore_original_signals_state (); |
370 | ||
c906108c | 371 | /* There is no execlpe call, so we have to set the environment |
c5aa993b JM |
372 | for our child in the global variable. If we've vforked, this |
373 | clobbers the parent, but environ is restored a few lines down | |
374 | in the parent. By the way, yes we do need to look down the | |
375 | path to find $SHELL. Rich Pixley says so, and I agree. */ | |
c906108c SS |
376 | environ = env; |
377 | ||
e69860f1 TG |
378 | if (exec_fun != NULL) |
379 | (*exec_fun) (argv[0], argv, env); | |
380 | else | |
381 | execvp (argv[0], argv); | |
f877b031 TG |
382 | |
383 | /* If we get here, it's an error. */ | |
384 | save_errno = errno; | |
fe23c31f | 385 | fprintf_unfiltered (gdb_stderr, "Cannot exec %s", argv[0]); |
f877b031 TG |
386 | for (i = 1; argv[i] != NULL; i++) |
387 | fprintf_unfiltered (gdb_stderr, " %s", argv[i]); | |
388 | fprintf_unfiltered (gdb_stderr, ".\n"); | |
389 | fprintf_unfiltered (gdb_stderr, "Error: %s\n", | |
390 | safe_strerror (save_errno)); | |
391 | gdb_flush (gdb_stderr); | |
392 | _exit (0177); | |
c906108c SS |
393 | } |
394 | ||
395 | /* Restore our environment in case a vforked child clob'd it. */ | |
396 | environ = save_our_env; | |
397 | ||
49940788 PA |
398 | /* Likewise the current UI. */ |
399 | current_ui = save_ui; | |
400 | ||
d90e17a7 PA |
401 | if (!have_inferiors ()) |
402 | init_thread_list (); | |
c906108c | 403 | |
6c95b8df PA |
404 | inf = current_inferior (); |
405 | ||
406 | inferior_appeared (inf, pid); | |
7f9f62ba | 407 | |
74a4fe32 MK |
408 | /* Needed for wait_for_inferior stuff below. */ |
409 | inferior_ptid = pid_to_ptid (pid); | |
c906108c | 410 | |
191c4426 PA |
411 | new_tty_postfork (); |
412 | ||
27c9d204 PA |
413 | /* We have something that executes now. We'll be running through |
414 | the shell at this point, but the pid shouldn't change. Targets | |
415 | supporting MT should fill this task's ptid with more data as soon | |
416 | as they can. */ | |
417 | add_thread_silent (inferior_ptid); | |
418 | ||
c906108c | 419 | /* Now that we have a child process, make it our target, and |
74a4fe32 MK |
420 | initialize anything target-vector-specific that needs |
421 | initializing. */ | |
136d6dae VP |
422 | if (init_trace_fun) |
423 | (*init_trace_fun) (pid); | |
c906108c SS |
424 | |
425 | /* We are now in the child process of interest, having exec'd the | |
426 | correct program, and are poised at the first instruction of the | |
427 | new program. */ | |
136d6dae | 428 | return pid; |
c906108c SS |
429 | } |
430 | ||
c906108c SS |
431 | /* Accept NTRAPS traps from the inferior. */ |
432 | ||
433 | void | |
fba45db2 | 434 | startup_inferior (int ntraps) |
c906108c SS |
435 | { |
436 | int pending_execs = ntraps; | |
74a4fe32 | 437 | int terminal_initted = 0; |
d90e17a7 PA |
438 | ptid_t resume_ptid; |
439 | ||
98882a26 PA |
440 | if (startup_with_shell) |
441 | { | |
442 | /* One trap extra for exec'ing the shell. */ | |
443 | pending_execs++; | |
444 | } | |
445 | ||
d90e17a7 PA |
446 | if (target_supports_multi_process ()) |
447 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
448 | else | |
449 | resume_ptid = minus_one_ptid; | |
c906108c | 450 | |
74a4fe32 MK |
451 | /* The process was started by the fork that created it, but it will |
452 | have stopped one instruction after execing the shell. Here we | |
453 | must get it up to actual execution of the real program. */ | |
c906108c | 454 | |
ccd213ac DJ |
455 | if (exec_wrapper) |
456 | pending_execs++; | |
457 | ||
c906108c SS |
458 | while (1) |
459 | { | |
a493e3e2 | 460 | enum gdb_signal resume_signal = GDB_SIGNAL_0; |
2e979b94 | 461 | ptid_t event_ptid; |
3c35e65b UW |
462 | |
463 | struct target_waitstatus ws; | |
464 | memset (&ws, 0, sizeof (ws)); | |
47608cb1 | 465 | event_ptid = target_wait (resume_ptid, &ws, 0); |
3c35e65b | 466 | |
2e979b94 PA |
467 | if (ws.kind == TARGET_WAITKIND_IGNORE) |
468 | /* The inferior didn't really stop, keep waiting. */ | |
469 | continue; | |
3c35e65b UW |
470 | |
471 | switch (ws.kind) | |
472 | { | |
3c35e65b UW |
473 | case TARGET_WAITKIND_SPURIOUS: |
474 | case TARGET_WAITKIND_LOADED: | |
475 | case TARGET_WAITKIND_FORKED: | |
476 | case TARGET_WAITKIND_VFORKED: | |
477 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
478 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
479 | /* Ignore gracefully during startup of the inferior. */ | |
2e979b94 | 480 | switch_to_thread (event_ptid); |
3c35e65b UW |
481 | break; |
482 | ||
483 | case TARGET_WAITKIND_SIGNALLED: | |
484 | target_terminal_ours (); | |
7d5adfe3 | 485 | target_mourn_inferior (event_ptid); |
3c35e65b | 486 | error (_("During startup program terminated with signal %s, %s."), |
2ea28649 PA |
487 | gdb_signal_to_name (ws.value.sig), |
488 | gdb_signal_to_string (ws.value.sig)); | |
3c35e65b UW |
489 | return; |
490 | ||
491 | case TARGET_WAITKIND_EXITED: | |
492 | target_terminal_ours (); | |
7d5adfe3 | 493 | target_mourn_inferior (event_ptid); |
3c35e65b UW |
494 | if (ws.value.integer) |
495 | error (_("During startup program exited with code %d."), | |
496 | ws.value.integer); | |
497 | else | |
498 | error (_("During startup program exited normally.")); | |
499 | return; | |
500 | ||
501 | case TARGET_WAITKIND_EXECD: | |
502 | /* Handle EXEC signals as if they were SIGTRAP signals. */ | |
503 | xfree (ws.value.execd_pathname); | |
a493e3e2 | 504 | resume_signal = GDB_SIGNAL_TRAP; |
2e979b94 | 505 | switch_to_thread (event_ptid); |
3c35e65b UW |
506 | break; |
507 | ||
508 | case TARGET_WAITKIND_STOPPED: | |
509 | resume_signal = ws.value.sig; | |
2e979b94 | 510 | switch_to_thread (event_ptid); |
3c35e65b UW |
511 | break; |
512 | } | |
2020b7ab | 513 | |
a493e3e2 | 514 | if (resume_signal != GDB_SIGNAL_TRAP) |
c906108c | 515 | { |
3c35e65b | 516 | /* Let shell child handle its own signals in its own way. */ |
049a8570 | 517 | target_continue (resume_ptid, resume_signal); |
c906108c SS |
518 | } |
519 | else | |
520 | { | |
521 | /* We handle SIGTRAP, however; it means child did an exec. */ | |
522 | if (!terminal_initted) | |
523 | { | |
74a4fe32 MK |
524 | /* Now that the child has exec'd we know it has already |
525 | set its process group. On POSIX systems, tcsetpgrp | |
526 | will fail with EPERM if we try it before the child's | |
527 | setpgid. */ | |
c906108c SS |
528 | |
529 | /* Set up the "saved terminal modes" of the inferior | |
c5aa993b | 530 | based on what modes we are starting it with. */ |
c906108c SS |
531 | target_terminal_init (); |
532 | ||
533 | /* Install inferior's terminal modes. */ | |
534 | target_terminal_inferior (); | |
535 | ||
536 | terminal_initted = 1; | |
537 | } | |
538 | ||
74a4fe32 | 539 | if (--pending_execs == 0) |
c906108c SS |
540 | break; |
541 | ||
3c35e65b | 542 | /* Just make it go on. */ |
049a8570 | 543 | target_continue_no_signal (resume_ptid); |
c906108c SS |
544 | } |
545 | } | |
2e979b94 PA |
546 | |
547 | /* Mark all threads non-executing. */ | |
d90e17a7 | 548 | set_executing (resume_ptid, 0); |
c906108c | 549 | } |
ccd213ac DJ |
550 | |
551 | /* Implement the "unset exec-wrapper" command. */ | |
552 | ||
553 | static void | |
554 | unset_exec_wrapper_command (char *args, int from_tty) | |
555 | { | |
556 | xfree (exec_wrapper); | |
557 | exec_wrapper = NULL; | |
558 | } | |
559 | ||
98882a26 PA |
560 | static void |
561 | show_startup_with_shell (struct ui_file *file, int from_tty, | |
562 | struct cmd_list_element *c, const char *value) | |
563 | { | |
564 | fprintf_filtered (file, | |
565 | _("Use of shell to start subprocesses is %s.\n"), | |
566 | value); | |
567 | } | |
568 | ||
2c0b251b PA |
569 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
570 | extern initialize_file_ftype _initialize_fork_child; | |
571 | ||
ccd213ac DJ |
572 | void |
573 | _initialize_fork_child (void) | |
574 | { | |
575 | add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\ | |
576 | Set a wrapper for running programs.\n\ | |
577 | The wrapper prepares the system and environment for the new program."), | |
578 | _("\ | |
579 | Show the wrapper for running programs."), NULL, | |
580 | NULL, NULL, | |
581 | &setlist, &showlist); | |
582 | ||
583 | add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command, | |
584 | _("Disable use of an execution wrapper."), | |
585 | &unsetlist); | |
98882a26 PA |
586 | |
587 | add_setshow_boolean_cmd ("startup-with-shell", class_support, | |
588 | &startup_with_shell, _("\ | |
589 | Set use of shell to start subprocesses. The default is on."), _("\ | |
590 | Show use of shell to start subprocesses."), NULL, | |
591 | NULL, | |
592 | show_startup_with_shell, | |
593 | &setlist, &showlist); | |
ccd213ac | 594 | } |