]>
Commit | Line | Data |
---|---|---|
0d62e5e8 | 1 | /* Thread management interface, for the remote server for GDB. |
32d0add0 | 2 | Copyright (C) 2002-2015 Free Software Foundation, Inc. |
0d62e5e8 DJ |
3 | |
4 | Contributed by MontaVista Software. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
0d62e5e8 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0d62e5e8 DJ |
20 | |
21 | #include "server.h" | |
22 | ||
23 | #include "linux-low.h" | |
24 | ||
25 | extern int debug_threads; | |
26 | ||
24a09b5f DJ |
27 | static int thread_db_use_events; |
28 | ||
0050a760 | 29 | #include "gdb_proc_service.h" |
125f8a3d | 30 | #include "nat/gdb_thread_db.h" |
e6712ff1 | 31 | #include "gdb_vecs.h" |
2db9a427 | 32 | #include "nat/linux-procfs.h" |
0d62e5e8 | 33 | |
96f15937 | 34 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 35 | #include <dlfcn.h> |
96f15937 PP |
36 | #endif |
37 | ||
186947f7 | 38 | #include <stdint.h> |
cdbfd419 PP |
39 | #include <limits.h> |
40 | #include <ctype.h> | |
41 | ||
42 | struct thread_db | |
43 | { | |
44 | /* Structure that identifies the child process for the | |
45 | <proc_service.h> interface. */ | |
46 | struct ps_prochandle proc_handle; | |
47 | ||
48 | /* Connection to the libthread_db library. */ | |
49 | td_thragent_t *thread_agent; | |
50 | ||
9836d6ea PA |
51 | /* If this flag has been set, we've already asked GDB for all |
52 | symbols we might need; assume symbol cache misses are | |
53 | failures. */ | |
54 | int all_symbols_looked_up; | |
55 | ||
96f15937 | 56 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 PP |
57 | /* Handle of the libthread_db from dlopen. */ |
58 | void *handle; | |
96f15937 | 59 | #endif |
cdbfd419 | 60 | |
f9e39928 PA |
61 | /* Thread creation event breakpoint. The code at this location in |
62 | the child process will be called by the pthread library whenever | |
63 | a new thread is created. By setting a special breakpoint at this | |
64 | location, GDB can detect when a new thread is created. We obtain | |
65 | this location via the td_ta_event_addr call. Note that if the | |
66 | running kernel supports tracing clones, then we don't need to use | |
67 | (and in fact don't use) this magic thread event breakpoint to | |
68 | learn about threads. */ | |
69 | struct breakpoint *td_create_bp; | |
70 | ||
cdbfd419 PP |
71 | /* Addresses of libthread_db functions. */ |
72 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta); | |
73 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
74 | td_event_msg_t *msg); | |
75 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
76 | td_thr_events_t *event); | |
77 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
78 | td_event_e event, td_notify_t *ptr); | |
79 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
80 | td_thrhandle_t *th); | |
81 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
82 | td_thrinfo_t *infop); | |
83 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
84 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
85 | td_thr_iter_f *callback, void *cbdata_p, | |
86 | td_thr_state_e state, int ti_pri, | |
87 | sigset_t *ti_sigmask_p, | |
88 | unsigned int ti_user_flags); | |
89 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
90 | psaddr_t map_address, |
91 | size_t offset, psaddr_t *address); | |
5876f503 JK |
92 | td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th, |
93 | unsigned long int modid, | |
94 | psaddr_t *base); | |
cdbfd419 PP |
95 | const char ** (*td_symbol_list_p) (void); |
96 | }; | |
97 | ||
98 | static char *libthread_db_search_path; | |
186947f7 | 99 | |
95954743 | 100 | static int find_one_thread (ptid_t); |
0d62e5e8 DJ |
101 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
102 | ||
54363045 | 103 | static const char * |
0d62e5e8 DJ |
104 | thread_db_err_str (td_err_e err) |
105 | { | |
106 | static char buf[64]; | |
107 | ||
108 | switch (err) | |
109 | { | |
110 | case TD_OK: | |
111 | return "generic 'call succeeded'"; | |
112 | case TD_ERR: | |
113 | return "generic error"; | |
114 | case TD_NOTHR: | |
115 | return "no thread to satisfy query"; | |
116 | case TD_NOSV: | |
117 | return "no sync handle to satisfy query"; | |
118 | case TD_NOLWP: | |
119 | return "no LWP to satisfy query"; | |
120 | case TD_BADPH: | |
121 | return "invalid process handle"; | |
122 | case TD_BADTH: | |
123 | return "invalid thread handle"; | |
124 | case TD_BADSH: | |
125 | return "invalid synchronization handle"; | |
126 | case TD_BADTA: | |
127 | return "invalid thread agent"; | |
128 | case TD_BADKEY: | |
129 | return "invalid key"; | |
130 | case TD_NOMSG: | |
131 | return "no event message for getmsg"; | |
132 | case TD_NOFPREGS: | |
133 | return "FPU register set not available"; | |
134 | case TD_NOLIBTHREAD: | |
135 | return "application not linked with libthread"; | |
136 | case TD_NOEVENT: | |
137 | return "requested event is not supported"; | |
138 | case TD_NOCAPAB: | |
139 | return "capability not available"; | |
140 | case TD_DBERR: | |
141 | return "debugger service failed"; | |
142 | case TD_NOAPLIC: | |
143 | return "operation not applicable to"; | |
144 | case TD_NOTSD: | |
145 | return "no thread-specific data for this thread"; | |
146 | case TD_MALLOC: | |
147 | return "malloc failed"; | |
148 | case TD_PARTIALREG: | |
149 | return "only part of register set was written/read"; | |
150 | case TD_NOXREGS: | |
151 | return "X register set not available for this thread"; | |
3db0444b DJ |
152 | #ifdef HAVE_TD_VERSION |
153 | case TD_VERSION: | |
154 | return "version mismatch between libthread_db and libpthread"; | |
155 | #endif | |
0d62e5e8 | 156 | default: |
6cebaf6e | 157 | xsnprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
0d62e5e8 DJ |
158 | return buf; |
159 | } | |
160 | } | |
161 | ||
162 | #if 0 | |
163 | static char * | |
164 | thread_db_state_str (td_thr_state_e state) | |
165 | { | |
166 | static char buf[64]; | |
167 | ||
168 | switch (state) | |
169 | { | |
170 | case TD_THR_STOPPED: | |
171 | return "stopped by debugger"; | |
172 | case TD_THR_RUN: | |
173 | return "runnable"; | |
174 | case TD_THR_ACTIVE: | |
175 | return "active"; | |
176 | case TD_THR_ZOMBIE: | |
177 | return "zombie"; | |
178 | case TD_THR_SLEEP: | |
179 | return "sleeping"; | |
180 | case TD_THR_STOPPED_ASLEEP: | |
181 | return "stopped by debugger AND blocked"; | |
182 | default: | |
6cebaf6e | 183 | xsnprintf (buf, sizeof (buf), "unknown thread_db state %d", state); |
0d62e5e8 DJ |
184 | return buf; |
185 | } | |
186 | } | |
187 | #endif | |
188 | ||
b65d95c5 | 189 | static int |
0d62e5e8 DJ |
190 | thread_db_create_event (CORE_ADDR where) |
191 | { | |
192 | td_event_msg_t msg; | |
193 | td_err_e err; | |
54a0b537 | 194 | struct lwp_info *lwp; |
fe978cb0 | 195 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
cdbfd419 | 196 | |
38e08fca | 197 | gdb_assert (thread_db->td_ta_event_getmsg_p != NULL); |
0d62e5e8 DJ |
198 | |
199 | if (debug_threads) | |
87ce2a04 | 200 | debug_printf ("Thread creation event.\n"); |
0d62e5e8 | 201 | |
0d62e5e8 DJ |
202 | /* FIXME: This assumes we don't get another event. |
203 | In the LinuxThreads implementation, this is safe, | |
204 | because all events come from the manager thread | |
205 | (except for its own creation, of course). */ | |
cdbfd419 | 206 | err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg); |
0d62e5e8 DJ |
207 | if (err != TD_OK) |
208 | fprintf (stderr, "thread getmsg err: %s\n", | |
209 | thread_db_err_str (err)); | |
210 | ||
4105de34 DJ |
211 | /* If we do not know about the main thread yet, this would be a good time to |
212 | find it. We need to do this to pick up the main thread before any newly | |
213 | created threads. */ | |
0bfdf32f | 214 | lwp = get_thread_lwp (current_thread); |
54a0b537 | 215 | if (lwp->thread_known == 0) |
0bfdf32f | 216 | find_one_thread (current_thread->entry.id); |
4105de34 | 217 | |
0d62e5e8 DJ |
218 | /* msg.event == TD_EVENT_CREATE */ |
219 | ||
220 | find_new_threads_callback (msg.th_p, NULL); | |
b65d95c5 DJ |
221 | |
222 | return 0; | |
0d62e5e8 DJ |
223 | } |
224 | ||
0d62e5e8 | 225 | static int |
f9e39928 | 226 | thread_db_enable_reporting (void) |
0d62e5e8 DJ |
227 | { |
228 | td_thr_events_t events; | |
229 | td_notify_t notify; | |
230 | td_err_e err; | |
fe978cb0 | 231 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
cdbfd419 PP |
232 | |
233 | if (thread_db->td_ta_set_event_p == NULL | |
234 | || thread_db->td_ta_event_addr_p == NULL | |
235 | || thread_db->td_ta_event_getmsg_p == NULL) | |
236 | /* This libthread_db is missing required support. */ | |
237 | return 0; | |
0d62e5e8 DJ |
238 | |
239 | /* Set the process wide mask saying which events we're interested in. */ | |
240 | td_event_emptyset (&events); | |
241 | td_event_addset (&events, TD_CREATE); | |
242 | ||
cdbfd419 | 243 | err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events); |
0d62e5e8 DJ |
244 | if (err != TD_OK) |
245 | { | |
246 | warning ("Unable to set global thread event mask: %s", | |
1b3f6016 | 247 | thread_db_err_str (err)); |
0d62e5e8 DJ |
248 | return 0; |
249 | } | |
250 | ||
251 | /* Get address for thread creation breakpoint. */ | |
cdbfd419 PP |
252 | err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE, |
253 | ¬ify); | |
0d62e5e8 DJ |
254 | if (err != TD_OK) |
255 | { | |
256 | warning ("Unable to get location for thread creation breakpoint: %s", | |
257 | thread_db_err_str (err)); | |
258 | return 0; | |
259 | } | |
f9e39928 PA |
260 | thread_db->td_create_bp |
261 | = set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
262 | thread_db_create_event); | |
0d62e5e8 | 263 | |
0d62e5e8 DJ |
264 | return 1; |
265 | } | |
266 | ||
ae13219e | 267 | static int |
95954743 | 268 | find_one_thread (ptid_t ptid) |
0d62e5e8 | 269 | { |
ae13219e DJ |
270 | td_thrhandle_t th; |
271 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
272 | td_err_e err; |
273 | struct thread_info *inferior; | |
54a0b537 | 274 | struct lwp_info *lwp; |
fe978cb0 | 275 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
95954743 | 276 | int lwpid = ptid_get_lwp (ptid); |
0d62e5e8 | 277 | |
95954743 | 278 | inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid); |
54a0b537 PA |
279 | lwp = get_thread_lwp (inferior); |
280 | if (lwp->thread_known) | |
ae13219e DJ |
281 | return 1; |
282 | ||
24a09b5f | 283 | /* Get information about this thread. */ |
cdbfd419 | 284 | err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
ae13219e | 285 | if (err != TD_OK) |
24a09b5f DJ |
286 | error ("Cannot get thread handle for LWP %d: %s", |
287 | lwpid, thread_db_err_str (err)); | |
ae13219e | 288 | |
cdbfd419 | 289 | err = thread_db->td_thr_get_info_p (&th, &ti); |
ae13219e | 290 | if (err != TD_OK) |
24a09b5f DJ |
291 | error ("Cannot get thread info for LWP %d: %s", |
292 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
293 | |
294 | if (debug_threads) | |
87ce2a04 DE |
295 | debug_printf ("Found thread %ld (LWP %d)\n", |
296 | ti.ti_tid, ti.ti_lid); | |
ae13219e | 297 | |
95954743 | 298 | if (lwpid != ti.ti_lid) |
24a09b5f DJ |
299 | { |
300 | warning ("PID mismatch! Expected %ld, got %ld", | |
95954743 | 301 | (long) lwpid, (long) ti.ti_lid); |
24a09b5f DJ |
302 | return 0; |
303 | } | |
ae13219e | 304 | |
24a09b5f | 305 | if (thread_db_use_events) |
0d62e5e8 | 306 | { |
cdbfd419 | 307 | err = thread_db->td_thr_event_enable_p (&th, 1); |
ae13219e DJ |
308 | if (err != TD_OK) |
309 | error ("Cannot enable thread event reporting for %d: %s", | |
310 | ti.ti_lid, thread_db_err_str (err)); | |
0d62e5e8 | 311 | } |
ae13219e | 312 | |
24a09b5f DJ |
313 | /* If the new thread ID is zero, a final thread ID will be available |
314 | later. Do not enable thread debugging yet. */ | |
315 | if (ti.ti_tid == 0) | |
316 | return 0; | |
ae13219e | 317 | |
54a0b537 PA |
318 | lwp->thread_known = 1; |
319 | lwp->th = th; | |
ae13219e | 320 | |
ae13219e DJ |
321 | return 1; |
322 | } | |
323 | ||
5f7d1694 PP |
324 | /* Attach a thread. Return true on success. */ |
325 | ||
326 | static int | |
327 | attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
ae13219e | 328 | { |
7ae1a6a6 PA |
329 | struct process_info *proc = current_process (); |
330 | int pid = pid_of (proc); | |
331 | ptid_t ptid = ptid_build (pid, ti_p->ti_lid, 0); | |
54a0b537 | 332 | struct lwp_info *lwp; |
7ae1a6a6 | 333 | int err; |
ae13219e | 334 | |
0d62e5e8 | 335 | if (debug_threads) |
87ce2a04 DE |
336 | debug_printf ("Attaching to thread %ld (LWP %d)\n", |
337 | ti_p->ti_tid, ti_p->ti_lid); | |
7ae1a6a6 PA |
338 | err = linux_attach_lwp (ptid); |
339 | if (err != 0) | |
0d62e5e8 | 340 | { |
7ae1a6a6 PA |
341 | warning ("Could not attach to thread %ld (LWP %d): %s\n", |
342 | ti_p->ti_tid, ti_p->ti_lid, | |
8784d563 | 343 | linux_ptrace_attach_fail_reason_string (ptid, err)); |
5f7d1694 | 344 | return 0; |
0d62e5e8 DJ |
345 | } |
346 | ||
7ae1a6a6 PA |
347 | lwp = find_lwp_pid (ptid); |
348 | gdb_assert (lwp != NULL); | |
54a0b537 PA |
349 | lwp->thread_known = 1; |
350 | lwp->th = *th_p; | |
24a09b5f DJ |
351 | |
352 | if (thread_db_use_events) | |
353 | { | |
5f7d1694 | 354 | td_err_e err; |
fe978cb0 | 355 | struct thread_db *thread_db = proc->priv->thread_db; |
5f7d1694 | 356 | |
cdbfd419 | 357 | err = thread_db->td_thr_event_enable_p (th_p, 1); |
24a09b5f DJ |
358 | if (err != TD_OK) |
359 | error ("Cannot enable thread event reporting for %d: %s", | |
360 | ti_p->ti_lid, thread_db_err_str (err)); | |
361 | } | |
5f7d1694 PP |
362 | |
363 | return 1; | |
364 | } | |
365 | ||
366 | /* Attach thread if we haven't seen it yet. | |
367 | Increment *COUNTER if we have attached a new thread. | |
368 | Return false on failure. */ | |
369 | ||
370 | static int | |
371 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, | |
372 | int *counter) | |
373 | { | |
374 | struct lwp_info *lwp; | |
375 | ||
376 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); | |
377 | if (lwp != NULL) | |
378 | return 1; | |
379 | ||
380 | if (!attach_thread (th_p, ti_p)) | |
381 | return 0; | |
382 | ||
383 | if (counter != NULL) | |
384 | *counter += 1; | |
385 | ||
386 | return 1; | |
0d62e5e8 DJ |
387 | } |
388 | ||
389 | static int | |
390 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
391 | { | |
392 | td_thrinfo_t ti; | |
393 | td_err_e err; | |
fe978cb0 | 394 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
0d62e5e8 | 395 | |
cdbfd419 | 396 | err = thread_db->td_thr_get_info_p (th_p, &ti); |
0d62e5e8 DJ |
397 | if (err != TD_OK) |
398 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
399 | ||
a33e3959 PA |
400 | if (ti.ti_lid == -1) |
401 | { | |
402 | /* A thread with kernel thread ID -1 is either a thread that | |
403 | exited and was joined, or a thread that is being created but | |
404 | hasn't started yet, and that is reusing the tcb/stack of a | |
405 | thread that previously exited and was joined. (glibc marks | |
406 | terminated and joined threads with kernel thread ID -1. See | |
407 | glibc PR17707. */ | |
d6c146e9 PA |
408 | if (debug_threads) |
409 | debug_printf ("thread_db: skipping exited and " | |
410 | "joined thread (0x%lx)\n", ti.ti_tid); | |
a33e3959 PA |
411 | return 0; |
412 | } | |
413 | ||
0d62e5e8 DJ |
414 | /* Check for zombies. */ |
415 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
416 | return 0; | |
417 | ||
5f7d1694 PP |
418 | if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
419 | { | |
420 | /* Terminate iteration early: we might be looking at stale data in | |
421 | the inferior. The thread_db_find_new_threads will retry. */ | |
422 | return 1; | |
423 | } | |
0d62e5e8 DJ |
424 | |
425 | return 0; | |
426 | } | |
427 | ||
428 | static void | |
429 | thread_db_find_new_threads (void) | |
430 | { | |
431 | td_err_e err; | |
fbd5db48 | 432 | ptid_t ptid = current_ptid; |
fe978cb0 | 433 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
5f7d1694 | 434 | int loop, iteration; |
0d62e5e8 | 435 | |
ae13219e DJ |
436 | /* This function is only called when we first initialize thread_db. |
437 | First locate the initial thread. If it is not ready for | |
438 | debugging yet, then stop. */ | |
95954743 | 439 | if (find_one_thread (ptid) == 0) |
ae13219e DJ |
440 | return; |
441 | ||
5f7d1694 PP |
442 | /* Require 4 successive iterations which do not find any new threads. |
443 | The 4 is a heuristic: there is an inherent race here, and I have | |
444 | seen that 2 iterations in a row are not always sufficient to | |
445 | "capture" all threads. */ | |
446 | for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) | |
447 | { | |
448 | int new_thread_count = 0; | |
449 | ||
450 | /* Iterate over all user-space threads to discover new threads. */ | |
451 | err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, | |
452 | find_new_threads_callback, | |
453 | &new_thread_count, | |
493e2a69 MS |
454 | TD_THR_ANY_STATE, |
455 | TD_THR_LOWEST_PRIORITY, | |
5f7d1694 PP |
456 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); |
457 | if (debug_threads) | |
87ce2a04 DE |
458 | debug_printf ("Found %d threads in iteration %d.\n", |
459 | new_thread_count, iteration); | |
5f7d1694 PP |
460 | |
461 | if (new_thread_count != 0) | |
462 | { | |
463 | /* Found new threads. Restart iteration from beginning. */ | |
464 | loop = -1; | |
465 | } | |
466 | } | |
0d62e5e8 DJ |
467 | if (err != TD_OK) |
468 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
469 | } | |
470 | ||
fd500816 DJ |
471 | /* Cache all future symbols that thread_db might request. We can not |
472 | request symbols at arbitrary states in the remote protocol, only | |
473 | when the client tells us that new symbols are available. So when | |
474 | we load the thread library, make sure to check the entire list. */ | |
475 | ||
476 | static void | |
477 | thread_db_look_up_symbols (void) | |
478 | { | |
fe978cb0 | 479 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
cdbfd419 | 480 | const char **sym_list; |
fd500816 DJ |
481 | CORE_ADDR unused; |
482 | ||
cdbfd419 | 483 | for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++) |
9836d6ea PA |
484 | look_up_one_symbol (*sym_list, &unused, 1); |
485 | ||
486 | /* We're not interested in any other libraries loaded after this | |
487 | point, only in symbols in libpthread.so. */ | |
488 | thread_db->all_symbols_looked_up = 1; | |
489 | } | |
490 | ||
491 | int | |
492 | thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp) | |
493 | { | |
fe978cb0 | 494 | struct thread_db *thread_db = current_process ()->priv->thread_db; |
9836d6ea PA |
495 | int may_ask_gdb = !thread_db->all_symbols_looked_up; |
496 | ||
497 | /* If we've passed the call to thread_db_look_up_symbols, then | |
498 | anything not in the cache must not exist; we're not interested | |
499 | in any libraries loaded after that point, only in symbols in | |
500 | libpthread.so. It might not be an appropriate time to look | |
501 | up a symbol, e.g. while we're trying to fetch registers. */ | |
502 | return look_up_one_symbol (name, addrp, may_ask_gdb); | |
fd500816 DJ |
503 | } |
504 | ||
dae5f5cf DJ |
505 | int |
506 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
507 | CORE_ADDR load_module, CORE_ADDR *address) | |
508 | { | |
dae5f5cf DJ |
509 | psaddr_t addr; |
510 | td_err_e err; | |
54a0b537 | 511 | struct lwp_info *lwp; |
0bfdf32f | 512 | struct thread_info *saved_thread; |
cdbfd419 PP |
513 | struct process_info *proc; |
514 | struct thread_db *thread_db; | |
515 | ||
516 | proc = get_thread_process (thread); | |
fe978cb0 | 517 | thread_db = proc->priv->thread_db; |
dae5f5cf | 518 | |
7fe519cb | 519 | /* If the thread layer is not (yet) initialized, fail. */ |
8a4ac37e | 520 | if (thread_db == NULL || !thread_db->all_symbols_looked_up) |
7fe519cb UW |
521 | return TD_ERR; |
522 | ||
5876f503 JK |
523 | /* If td_thr_tls_get_addr is missing rather do not expect td_thr_tlsbase |
524 | could work. */ | |
525 | if (thread_db->td_thr_tls_get_addr_p == NULL | |
526 | || (load_module == 0 && thread_db->td_thr_tlsbase_p == NULL)) | |
cdbfd419 PP |
527 | return -1; |
528 | ||
54a0b537 PA |
529 | lwp = get_thread_lwp (thread); |
530 | if (!lwp->thread_known) | |
80894984 | 531 | find_one_thread (thread->entry.id); |
54a0b537 | 532 | if (!lwp->thread_known) |
dae5f5cf DJ |
533 | return TD_NOTHR; |
534 | ||
0bfdf32f GB |
535 | saved_thread = current_thread; |
536 | current_thread = thread; | |
5876f503 JK |
537 | |
538 | if (load_module != 0) | |
539 | { | |
540 | /* Note the cast through uintptr_t: this interface only works if | |
541 | a target address fits in a psaddr_t, which is a host pointer. | |
542 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
543 | err = thread_db->td_thr_tls_get_addr_p (&lwp->th, | |
544 | (psaddr_t) (uintptr_t) load_module, | |
545 | offset, &addr); | |
546 | } | |
547 | else | |
548 | { | |
549 | /* This code path handles the case of -static -pthread executables: | |
550 | https://sourceware.org/ml/libc-help/2014-03/msg00024.html | |
551 | For older GNU libc r_debug.r_map is NULL. For GNU libc after | |
552 | PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL. | |
553 | The constant number 1 depends on GNU __libc_setup_tls | |
554 | initialization of l_tls_modid to 1. */ | |
555 | err = thread_db->td_thr_tlsbase_p (&lwp->th, 1, &addr); | |
556 | addr = (char *) addr + offset; | |
557 | } | |
558 | ||
0bfdf32f | 559 | current_thread = saved_thread; |
dae5f5cf DJ |
560 | if (err == TD_OK) |
561 | { | |
186947f7 | 562 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
563 | return 0; |
564 | } | |
565 | else | |
566 | return err; | |
cdbfd419 PP |
567 | } |
568 | ||
96f15937 PP |
569 | #ifdef USE_LIBTHREAD_DB_DIRECTLY |
570 | ||
571 | static int | |
572 | thread_db_load_search (void) | |
573 | { | |
574 | td_err_e err; | |
9836d6ea | 575 | struct thread_db *tdb; |
96f15937 PP |
576 | struct process_info *proc = current_process (); |
577 | ||
fe978cb0 | 578 | gdb_assert (proc->priv->thread_db == NULL); |
96f15937 | 579 | |
9836d6ea | 580 | tdb = xcalloc (1, sizeof (*tdb)); |
fe978cb0 | 581 | proc->priv->thread_db = tdb; |
f9e39928 | 582 | |
9836d6ea | 583 | tdb->td_ta_new_p = &td_ta_new; |
96f15937 PP |
584 | |
585 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 586 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
96f15937 PP |
587 | if (err != TD_OK) |
588 | { | |
589 | if (debug_threads) | |
87ce2a04 | 590 | debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err)); |
9836d6ea | 591 | free (tdb); |
fe978cb0 | 592 | proc->priv->thread_db = NULL; |
96f15937 PP |
593 | return 0; |
594 | } | |
595 | ||
9836d6ea PA |
596 | tdb->td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr; |
597 | tdb->td_thr_get_info_p = &td_thr_get_info; | |
598 | tdb->td_ta_thr_iter_p = &td_ta_thr_iter; | |
599 | tdb->td_symbol_list_p = &td_symbol_list; | |
96f15937 PP |
600 | |
601 | /* This is required only when thread_db_use_events is on. */ | |
9836d6ea | 602 | tdb->td_thr_event_enable_p = &td_thr_event_enable; |
96f15937 PP |
603 | |
604 | /* These are not essential. */ | |
9836d6ea PA |
605 | tdb->td_ta_event_addr_p = &td_ta_event_addr; |
606 | tdb->td_ta_set_event_p = &td_ta_set_event; | |
607 | tdb->td_ta_event_getmsg_p = &td_ta_event_getmsg; | |
608 | tdb->td_thr_tls_get_addr_p = &td_thr_tls_get_addr; | |
5876f503 | 609 | tdb->td_thr_tlsbase_p = &td_thr_tlsbase; |
96f15937 PP |
610 | |
611 | return 1; | |
612 | } | |
613 | ||
614 | #else | |
615 | ||
cdbfd419 PP |
616 | static int |
617 | try_thread_db_load_1 (void *handle) | |
618 | { | |
619 | td_err_e err; | |
9836d6ea | 620 | struct thread_db *tdb; |
cdbfd419 PP |
621 | struct process_info *proc = current_process (); |
622 | ||
fe978cb0 | 623 | gdb_assert (proc->priv->thread_db == NULL); |
cdbfd419 | 624 | |
9836d6ea | 625 | tdb = xcalloc (1, sizeof (*tdb)); |
fe978cb0 | 626 | proc->priv->thread_db = tdb; |
f9e39928 | 627 | |
9836d6ea | 628 | tdb->handle = handle; |
cdbfd419 PP |
629 | |
630 | /* Initialize pointers to the dynamic library functions we will use. | |
631 | Essential functions first. */ | |
632 | ||
633 | #define CHK(required, a) \ | |
634 | do \ | |
635 | { \ | |
636 | if ((a) == NULL) \ | |
637 | { \ | |
638 | if (debug_threads) \ | |
87ce2a04 | 639 | debug_printf ("dlsym: %s\n", dlerror ()); \ |
cdbfd419 | 640 | if (required) \ |
9836d6ea PA |
641 | { \ |
642 | free (tdb); \ | |
fe978cb0 | 643 | proc->priv->thread_db = NULL; \ |
9836d6ea PA |
644 | return 0; \ |
645 | } \ | |
cdbfd419 PP |
646 | } \ |
647 | } \ | |
648 | while (0) | |
649 | ||
9836d6ea | 650 | CHK (1, tdb->td_ta_new_p = dlsym (handle, "td_ta_new")); |
cdbfd419 PP |
651 | |
652 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 653 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
cdbfd419 PP |
654 | if (err != TD_OK) |
655 | { | |
656 | if (debug_threads) | |
87ce2a04 | 657 | debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err)); |
9836d6ea | 658 | free (tdb); |
fe978cb0 | 659 | proc->priv->thread_db = NULL; |
cdbfd419 PP |
660 | return 0; |
661 | } | |
662 | ||
9836d6ea PA |
663 | CHK (1, tdb->td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr")); |
664 | CHK (1, tdb->td_thr_get_info_p = dlsym (handle, "td_thr_get_info")); | |
665 | CHK (1, tdb->td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter")); | |
666 | CHK (1, tdb->td_symbol_list_p = dlsym (handle, "td_symbol_list")); | |
cdbfd419 PP |
667 | |
668 | /* This is required only when thread_db_use_events is on. */ | |
669 | CHK (thread_db_use_events, | |
9836d6ea | 670 | tdb->td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable")); |
cdbfd419 PP |
671 | |
672 | /* These are not essential. */ | |
9836d6ea PA |
673 | CHK (0, tdb->td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr")); |
674 | CHK (0, tdb->td_ta_set_event_p = dlsym (handle, "td_ta_set_event")); | |
675 | CHK (0, tdb->td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg")); | |
676 | CHK (0, tdb->td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr")); | |
5876f503 | 677 | CHK (0, tdb->td_thr_tlsbase_p = dlsym (handle, "td_thr_tlsbase")); |
cdbfd419 PP |
678 | |
679 | #undef CHK | |
680 | ||
cdbfd419 PP |
681 | return 1; |
682 | } | |
683 | ||
10e86dd7 DE |
684 | #ifdef HAVE_DLADDR |
685 | ||
cdbfd419 PP |
686 | /* Lookup a library in which given symbol resides. |
687 | Note: this is looking in the GDBSERVER process, not in the inferior. | |
688 | Returns library name, or NULL. */ | |
689 | ||
690 | static const char * | |
691 | dladdr_to_soname (const void *addr) | |
692 | { | |
693 | Dl_info info; | |
694 | ||
695 | if (dladdr (addr, &info) != 0) | |
696 | return info.dli_fname; | |
697 | return NULL; | |
698 | } | |
699 | ||
10e86dd7 DE |
700 | #endif |
701 | ||
cdbfd419 PP |
702 | static int |
703 | try_thread_db_load (const char *library) | |
704 | { | |
705 | void *handle; | |
706 | ||
707 | if (debug_threads) | |
87ce2a04 DE |
708 | debug_printf ("Trying host libthread_db library: %s.\n", |
709 | library); | |
cdbfd419 PP |
710 | handle = dlopen (library, RTLD_NOW); |
711 | if (handle == NULL) | |
712 | { | |
713 | if (debug_threads) | |
87ce2a04 | 714 | debug_printf ("dlopen failed: %s.\n", dlerror ()); |
cdbfd419 PP |
715 | return 0; |
716 | } | |
717 | ||
10e86dd7 | 718 | #ifdef HAVE_DLADDR |
cdbfd419 PP |
719 | if (debug_threads && strchr (library, '/') == NULL) |
720 | { | |
721 | void *td_init; | |
722 | ||
723 | td_init = dlsym (handle, "td_init"); | |
724 | if (td_init != NULL) | |
725 | { | |
726 | const char *const libpath = dladdr_to_soname (td_init); | |
727 | ||
728 | if (libpath != NULL) | |
729 | fprintf (stderr, "Host %s resolved to: %s.\n", | |
730 | library, libpath); | |
731 | } | |
732 | } | |
10e86dd7 | 733 | #endif |
cdbfd419 PP |
734 | |
735 | if (try_thread_db_load_1 (handle)) | |
736 | return 1; | |
737 | ||
738 | /* This library "refused" to work on current inferior. */ | |
739 | dlclose (handle); | |
740 | return 0; | |
741 | } | |
742 | ||
98a5dd13 DE |
743 | /* Handle $sdir in libthread-db-search-path. |
744 | Look for libthread_db in the system dirs, or wherever a plain | |
745 | dlopen(file_without_path) will look. | |
746 | The result is true for success. */ | |
747 | ||
cdbfd419 | 748 | static int |
98a5dd13 DE |
749 | try_thread_db_load_from_sdir (void) |
750 | { | |
751 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
752 | } | |
753 | ||
754 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
755 | The result is true for success. */ | |
756 | ||
757 | static int | |
758 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
cdbfd419 PP |
759 | { |
760 | char path[PATH_MAX]; | |
98a5dd13 DE |
761 | |
762 | if (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
763 | { | |
764 | char *cp = xmalloc (dir_len + 1); | |
765 | ||
766 | memcpy (cp, dir, dir_len); | |
767 | cp[dir_len] = '\0'; | |
768 | warning (_("libthread-db-search-path component too long," | |
769 | " ignored: %s."), cp); | |
770 | free (cp); | |
771 | return 0; | |
772 | } | |
773 | ||
774 | memcpy (path, dir, dir_len); | |
775 | path[dir_len] = '/'; | |
776 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
777 | return try_thread_db_load (path); | |
778 | } | |
779 | ||
780 | /* Search libthread_db_search_path for libthread_db which "agrees" | |
781 | to work on current inferior. | |
782 | The result is true for success. */ | |
783 | ||
784 | static int | |
785 | thread_db_load_search (void) | |
786 | { | |
e6712ff1 DE |
787 | VEC (char_ptr) *dir_vec; |
788 | char *this_dir; | |
789 | int i, rc = 0; | |
cdbfd419 PP |
790 | |
791 | if (libthread_db_search_path == NULL) | |
792 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
793 | ||
e6712ff1 DE |
794 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
795 | ||
796 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
cdbfd419 | 797 | { |
e6712ff1 | 798 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 DE |
799 | size_t this_dir_len; |
800 | ||
e6712ff1 | 801 | this_dir_len = strlen (this_dir); |
cdbfd419 | 802 | |
e6712ff1 DE |
803 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
804 | && (this_dir[pdir_len] == '\0' | |
805 | || this_dir[pdir_len] == '/')) | |
98a5dd13 DE |
806 | { |
807 | /* We don't maintain a list of loaded libraries so we don't know | |
808 | where libpthread lives. We *could* fetch the info, but we don't | |
809 | do that yet. Ignore it. */ | |
810 | } | |
e6712ff1 | 811 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
812 | { |
813 | if (try_thread_db_load_from_sdir ()) | |
cdbfd419 | 814 | { |
98a5dd13 | 815 | rc = 1; |
cdbfd419 PP |
816 | break; |
817 | } | |
cdbfd419 | 818 | } |
98a5dd13 | 819 | else |
cdbfd419 | 820 | { |
98a5dd13 DE |
821 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
822 | { | |
823 | rc = 1; | |
824 | break; | |
825 | } | |
cdbfd419 PP |
826 | } |
827 | } | |
cdbfd419 | 828 | |
e6712ff1 | 829 | free_char_ptr_vec (dir_vec); |
cdbfd419 | 830 | if (debug_threads) |
87ce2a04 | 831 | debug_printf ("thread_db_load_search returning %d\n", rc); |
cdbfd419 | 832 | return rc; |
dae5f5cf DJ |
833 | } |
834 | ||
96f15937 PP |
835 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
836 | ||
0d62e5e8 | 837 | int |
24a09b5f | 838 | thread_db_init (int use_events) |
0d62e5e8 | 839 | { |
95954743 | 840 | struct process_info *proc = current_process (); |
0d62e5e8 | 841 | |
fd500816 DJ |
842 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
843 | GNU/Linux calls tgid, "thread group ID". When we support | |
844 | attaching to threads, the original thread may not be the correct | |
845 | thread. We would have to get the process ID from /proc for NPTL. | |
846 | For LinuxThreads we could do something similar: follow the chain | |
847 | of parent processes until we find the highest one we're attached | |
848 | to, and use its tgid. | |
849 | ||
850 | This isn't the only place in gdbserver that assumes that the first | |
851 | process in the list is the thread group leader. */ | |
ea025f5f | 852 | |
24a09b5f DJ |
853 | thread_db_use_events = use_events; |
854 | ||
cdbfd419 | 855 | if (thread_db_load_search ()) |
0d62e5e8 | 856 | { |
24a09b5f | 857 | if (use_events && thread_db_enable_reporting () == 0) |
cdbfd419 PP |
858 | { |
859 | /* Keep trying; maybe event reporting will work later. */ | |
8336d594 | 860 | thread_db_mourn (proc); |
cdbfd419 PP |
861 | return 0; |
862 | } | |
2db9a427 PA |
863 | |
864 | /* It's best to avoid td_ta_thr_iter if possible. That walks | |
865 | data structures in the inferior's address space that may be | |
866 | corrupted, or, if the target is running, the list may change | |
867 | while we walk it. In the latter case, it's possible that a | |
868 | thread exits just at the exact time that causes GDBserver to | |
869 | get stuck in an infinite loop. If the kernel supports clone | |
870 | events, and /proc/PID/task/ exits, then we already know about | |
871 | all threads in the process. When we need info out of | |
872 | thread_db on a given thread (e.g., for TLS), we'll use | |
873 | find_one_thread then. That uses thread_db entry points that | |
874 | do not walk libpthread's thread list, so should be safe, as | |
875 | well as more efficient. */ | |
876 | if (use_events | |
877 | || !linux_proc_task_list_dir_exists (pid_of (proc))) | |
878 | thread_db_find_new_threads (); | |
fd500816 | 879 | thread_db_look_up_symbols (); |
0d62e5e8 | 880 | return 1; |
cdbfd419 | 881 | } |
0d62e5e8 | 882 | |
cdbfd419 PP |
883 | return 0; |
884 | } | |
885 | ||
ca5c370d PA |
886 | static int |
887 | any_thread_of (struct inferior_list_entry *entry, void *args) | |
888 | { | |
889 | int *pid_p = args; | |
890 | ||
891 | if (ptid_get_pid (entry->id) == *pid_p) | |
892 | return 1; | |
893 | ||
894 | return 0; | |
895 | } | |
896 | ||
f9e39928 PA |
897 | static void |
898 | switch_to_process (struct process_info *proc) | |
899 | { | |
900 | int pid = pid_of (proc); | |
901 | ||
0bfdf32f | 902 | current_thread = |
f9e39928 PA |
903 | (struct thread_info *) find_inferior (&all_threads, |
904 | any_thread_of, &pid); | |
905 | } | |
906 | ||
cdbfd419 PP |
907 | /* Disconnect from libthread_db and free resources. */ |
908 | ||
8336d594 PA |
909 | static void |
910 | disable_thread_event_reporting (struct process_info *proc) | |
cdbfd419 | 911 | { |
fe978cb0 | 912 | struct thread_db *thread_db = proc->priv->thread_db; |
cdbfd419 PP |
913 | if (thread_db) |
914 | { | |
21e1bee4 PP |
915 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
916 | td_thr_events_t *event); | |
917 | ||
fd7dd3e6 | 918 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
21e1bee4 | 919 | td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event"); |
fd7dd3e6 | 920 | #else |
fd7dd3e6 PA |
921 | td_ta_clear_event_p = &td_ta_clear_event; |
922 | #endif | |
923 | ||
8336d594 | 924 | if (td_ta_clear_event_p != NULL) |
21e1bee4 | 925 | { |
0bfdf32f | 926 | struct thread_info *saved_thread = current_thread; |
21e1bee4 | 927 | td_thr_events_t events; |
8336d594 | 928 | |
f9e39928 | 929 | switch_to_process (proc); |
21e1bee4 | 930 | |
fd7dd3e6 PA |
931 | /* Set the process wide mask saying we aren't interested |
932 | in any events anymore. */ | |
21e1bee4 PP |
933 | td_event_fillset (&events); |
934 | (*td_ta_clear_event_p) (thread_db->thread_agent, &events); | |
8336d594 | 935 | |
0bfdf32f | 936 | current_thread = saved_thread; |
21e1bee4 | 937 | } |
8336d594 PA |
938 | } |
939 | } | |
940 | ||
f9e39928 PA |
941 | static void |
942 | remove_thread_event_breakpoints (struct process_info *proc) | |
943 | { | |
fe978cb0 | 944 | struct thread_db *thread_db = proc->priv->thread_db; |
f9e39928 PA |
945 | |
946 | if (thread_db->td_create_bp != NULL) | |
947 | { | |
0bfdf32f | 948 | struct thread_info *saved_thread = current_thread; |
f9e39928 PA |
949 | |
950 | switch_to_process (proc); | |
951 | ||
952 | delete_breakpoint (thread_db->td_create_bp); | |
953 | thread_db->td_create_bp = NULL; | |
954 | ||
0bfdf32f | 955 | current_thread = saved_thread; |
f9e39928 PA |
956 | } |
957 | } | |
958 | ||
8336d594 PA |
959 | void |
960 | thread_db_detach (struct process_info *proc) | |
961 | { | |
fe978cb0 | 962 | struct thread_db *thread_db = proc->priv->thread_db; |
f9e39928 PA |
963 | |
964 | if (thread_db) | |
965 | { | |
966 | disable_thread_event_reporting (proc); | |
967 | remove_thread_event_breakpoints (proc); | |
968 | } | |
8336d594 PA |
969 | } |
970 | ||
971 | /* Disconnect from libthread_db and free resources. */ | |
972 | ||
973 | void | |
974 | thread_db_mourn (struct process_info *proc) | |
975 | { | |
fe978cb0 | 976 | struct thread_db *thread_db = proc->priv->thread_db; |
8336d594 PA |
977 | if (thread_db) |
978 | { | |
979 | td_err_e (*td_ta_delete_p) (td_thragent_t *); | |
980 | ||
981 | #ifndef USE_LIBTHREAD_DB_DIRECTLY | |
982 | td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete"); | |
983 | #else | |
984 | td_ta_delete_p = &td_ta_delete; | |
985 | #endif | |
cdbfd419 | 986 | |
cdbfd419 PP |
987 | if (td_ta_delete_p != NULL) |
988 | (*td_ta_delete_p) (thread_db->thread_agent); | |
989 | ||
fd7dd3e6 | 990 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 991 | dlclose (thread_db->handle); |
96f15937 PP |
992 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
993 | ||
cdbfd419 | 994 | free (thread_db); |
fe978cb0 | 995 | proc->priv->thread_db = NULL; |
cdbfd419 PP |
996 | } |
997 | } | |
998 | ||
999 | /* Handle "set libthread-db-search-path" monitor command and return 1. | |
1000 | For any other command, return 0. */ | |
1001 | ||
1002 | int | |
1003 | thread_db_handle_monitor_command (char *mon) | |
1004 | { | |
84e578fb DE |
1005 | const char *cmd = "set libthread-db-search-path"; |
1006 | size_t cmd_len = strlen (cmd); | |
1007 | ||
1008 | if (strncmp (mon, cmd, cmd_len) == 0 | |
1009 | && (mon[cmd_len] == '\0' | |
1010 | || mon[cmd_len] == ' ')) | |
cdbfd419 | 1011 | { |
84e578fb | 1012 | const char *cp = mon + cmd_len; |
cdbfd419 PP |
1013 | |
1014 | if (libthread_db_search_path != NULL) | |
1015 | free (libthread_db_search_path); | |
1016 | ||
1017 | /* Skip leading space (if any). */ | |
1018 | while (isspace (*cp)) | |
1019 | ++cp; | |
1020 | ||
84e578fb DE |
1021 | if (*cp == '\0') |
1022 | cp = LIBTHREAD_DB_SEARCH_PATH; | |
cdbfd419 PP |
1023 | libthread_db_search_path = xstrdup (cp); |
1024 | ||
1025 | monitor_output ("libthread-db-search-path set to `"); | |
1026 | monitor_output (libthread_db_search_path); | |
1027 | monitor_output ("'\n"); | |
1028 | return 1; | |
0d62e5e8 DJ |
1029 | } |
1030 | ||
cdbfd419 | 1031 | /* Tell server.c to perform default processing. */ |
0d62e5e8 DJ |
1032 | return 0; |
1033 | } |