1 /* Thread management interface, for the remote server for GDB.
2 Copyright (C) 2002-2015 Free Software Foundation, Inc.
4 Contributed by MontaVista Software.
6 This file is part of GDB.
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
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "linux-low.h"
25 extern int debug_threads;
27 static int thread_db_use_events;
29 #include "gdb_proc_service.h"
30 #include "nat/gdb_thread_db.h"
33 #ifndef USE_LIBTHREAD_DB_DIRECTLY
43 /* Structure that identifies the child process for the
44 <proc_service.h> interface. */
45 struct ps_prochandle proc_handle;
47 /* Connection to the libthread_db library. */
48 td_thragent_t *thread_agent;
50 /* If this flag has been set, we've already asked GDB for all
51 symbols we might need; assume symbol cache misses are
53 int all_symbols_looked_up;
55 #ifndef USE_LIBTHREAD_DB_DIRECTLY
56 /* Handle of the libthread_db from dlopen. */
60 /* Thread creation event breakpoint. The code at this location in
61 the child process will be called by the pthread library whenever
62 a new thread is created. By setting a special breakpoint at this
63 location, GDB can detect when a new thread is created. We obtain
64 this location via the td_ta_event_addr call. Note that if the
65 running kernel supports tracing clones, then we don't need to use
66 (and in fact don't use) this magic thread event breakpoint to
67 learn about threads. */
68 struct breakpoint *td_create_bp;
70 /* Addresses of libthread_db functions. */
71 td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta);
72 td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
74 td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
75 td_thr_events_t *event);
76 td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
77 td_event_e event, td_notify_t *ptr);
78 td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid,
80 td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
82 td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event);
83 td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
84 td_thr_iter_f *callback, void *cbdata_p,
85 td_thr_state_e state, int ti_pri,
86 sigset_t *ti_sigmask_p,
87 unsigned int ti_user_flags);
88 td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
90 size_t offset, psaddr_t *address);
91 td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th,
92 unsigned long int modid,
94 const char ** (*td_symbol_list_p) (void);
97 static char *libthread_db_search_path;
99 static int find_one_thread (ptid_t);
100 static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data);
103 thread_db_err_str (td_err_e err)
110 return "generic 'call succeeded'";
112 return "generic error";
114 return "no thread to satisfy query";
116 return "no sync handle to satisfy query";
118 return "no LWP to satisfy query";
120 return "invalid process handle";
122 return "invalid thread handle";
124 return "invalid synchronization handle";
126 return "invalid thread agent";
128 return "invalid key";
130 return "no event message for getmsg";
132 return "FPU register set not available";
134 return "application not linked with libthread";
136 return "requested event is not supported";
138 return "capability not available";
140 return "debugger service failed";
142 return "operation not applicable to";
144 return "no thread-specific data for this thread";
146 return "malloc failed";
148 return "only part of register set was written/read";
150 return "X register set not available for this thread";
151 #ifdef HAVE_TD_VERSION
153 return "version mismatch between libthread_db and libpthread";
156 xsnprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
163 thread_db_state_str (td_thr_state_e state)
170 return "stopped by debugger";
179 case TD_THR_STOPPED_ASLEEP:
180 return "stopped by debugger AND blocked";
182 xsnprintf (buf, sizeof (buf), "unknown thread_db state %d", state);
189 thread_db_create_event (CORE_ADDR where)
193 struct lwp_info *lwp;
194 struct thread_db *thread_db = current_process ()->private->thread_db;
196 gdb_assert (thread_db->td_ta_event_getmsg_p != NULL);
199 debug_printf ("Thread creation event.\n");
201 /* FIXME: This assumes we don't get another event.
202 In the LinuxThreads implementation, this is safe,
203 because all events come from the manager thread
204 (except for its own creation, of course). */
205 err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg);
207 fprintf (stderr, "thread getmsg err: %s\n",
208 thread_db_err_str (err));
210 /* If we do not know about the main thread yet, this would be a good time to
211 find it. We need to do this to pick up the main thread before any newly
213 lwp = get_thread_lwp (current_thread);
214 if (lwp->thread_known == 0)
215 find_one_thread (current_thread->entry.id);
217 /* msg.event == TD_EVENT_CREATE */
219 find_new_threads_callback (msg.th_p, NULL);
225 thread_db_enable_reporting (void)
227 td_thr_events_t events;
230 struct thread_db *thread_db = current_process ()->private->thread_db;
232 if (thread_db->td_ta_set_event_p == NULL
233 || thread_db->td_ta_event_addr_p == NULL
234 || thread_db->td_ta_event_getmsg_p == NULL)
235 /* This libthread_db is missing required support. */
238 /* Set the process wide mask saying which events we're interested in. */
239 td_event_emptyset (&events);
240 td_event_addset (&events, TD_CREATE);
242 err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events);
245 warning ("Unable to set global thread event mask: %s",
246 thread_db_err_str (err));
250 /* Get address for thread creation breakpoint. */
251 err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE,
255 warning ("Unable to get location for thread creation breakpoint: %s",
256 thread_db_err_str (err));
259 thread_db->td_create_bp
260 = set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr,
261 thread_db_create_event);
267 find_one_thread (ptid_t ptid)
272 struct thread_info *inferior;
273 struct lwp_info *lwp;
274 struct thread_db *thread_db = current_process ()->private->thread_db;
275 int lwpid = ptid_get_lwp (ptid);
277 inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid);
278 lwp = get_thread_lwp (inferior);
279 if (lwp->thread_known)
282 /* Get information about this thread. */
283 err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th);
285 error ("Cannot get thread handle for LWP %d: %s",
286 lwpid, thread_db_err_str (err));
288 err = thread_db->td_thr_get_info_p (&th, &ti);
290 error ("Cannot get thread info for LWP %d: %s",
291 lwpid, thread_db_err_str (err));
294 debug_printf ("Found thread %ld (LWP %d)\n",
295 ti.ti_tid, ti.ti_lid);
297 if (lwpid != ti.ti_lid)
299 warning ("PID mismatch! Expected %ld, got %ld",
300 (long) lwpid, (long) ti.ti_lid);
304 if (thread_db_use_events)
306 err = thread_db->td_thr_event_enable_p (&th, 1);
308 error ("Cannot enable thread event reporting for %d: %s",
309 ti.ti_lid, thread_db_err_str (err));
312 /* If the new thread ID is zero, a final thread ID will be available
313 later. Do not enable thread debugging yet. */
317 lwp->thread_known = 1;
323 /* Attach a thread. Return true on success. */
326 attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p)
328 struct process_info *proc = current_process ();
329 int pid = pid_of (proc);
330 ptid_t ptid = ptid_build (pid, ti_p->ti_lid, 0);
331 struct lwp_info *lwp;
335 debug_printf ("Attaching to thread %ld (LWP %d)\n",
336 ti_p->ti_tid, ti_p->ti_lid);
337 err = linux_attach_lwp (ptid);
340 warning ("Could not attach to thread %ld (LWP %d): %s\n",
341 ti_p->ti_tid, ti_p->ti_lid,
342 linux_ptrace_attach_fail_reason_string (ptid, err));
346 lwp = find_lwp_pid (ptid);
347 gdb_assert (lwp != NULL);
348 lwp->thread_known = 1;
351 if (thread_db_use_events)
354 struct thread_db *thread_db = proc->private->thread_db;
356 err = thread_db->td_thr_event_enable_p (th_p, 1);
358 error ("Cannot enable thread event reporting for %d: %s",
359 ti_p->ti_lid, thread_db_err_str (err));
365 /* Attach thread if we haven't seen it yet.
366 Increment *COUNTER if we have attached a new thread.
367 Return false on failure. */
370 maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p,
373 struct lwp_info *lwp;
375 lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid));
379 if (!attach_thread (th_p, ti_p))
389 find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
393 struct thread_db *thread_db = current_process ()->private->thread_db;
395 err = thread_db->td_thr_get_info_p (th_p, &ti);
397 error ("Cannot get thread info: %s", thread_db_err_str (err));
399 /* Check for zombies. */
400 if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
403 if (!maybe_attach_thread (th_p, &ti, (int *) data))
405 /* Terminate iteration early: we might be looking at stale data in
406 the inferior. The thread_db_find_new_threads will retry. */
414 thread_db_find_new_threads (void)
417 ptid_t ptid = current_ptid;
418 struct thread_db *thread_db = current_process ()->private->thread_db;
421 /* This function is only called when we first initialize thread_db.
422 First locate the initial thread. If it is not ready for
423 debugging yet, then stop. */
424 if (find_one_thread (ptid) == 0)
427 /* Require 4 successive iterations which do not find any new threads.
428 The 4 is a heuristic: there is an inherent race here, and I have
429 seen that 2 iterations in a row are not always sufficient to
430 "capture" all threads. */
431 for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration)
433 int new_thread_count = 0;
435 /* Iterate over all user-space threads to discover new threads. */
436 err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent,
437 find_new_threads_callback,
440 TD_THR_LOWEST_PRIORITY,
441 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
443 debug_printf ("Found %d threads in iteration %d.\n",
444 new_thread_count, iteration);
446 if (new_thread_count != 0)
448 /* Found new threads. Restart iteration from beginning. */
453 error ("Cannot find new threads: %s", thread_db_err_str (err));
456 /* Cache all future symbols that thread_db might request. We can not
457 request symbols at arbitrary states in the remote protocol, only
458 when the client tells us that new symbols are available. So when
459 we load the thread library, make sure to check the entire list. */
462 thread_db_look_up_symbols (void)
464 struct thread_db *thread_db = current_process ()->private->thread_db;
465 const char **sym_list;
468 for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++)
469 look_up_one_symbol (*sym_list, &unused, 1);
471 /* We're not interested in any other libraries loaded after this
472 point, only in symbols in libpthread.so. */
473 thread_db->all_symbols_looked_up = 1;
477 thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp)
479 struct thread_db *thread_db = current_process ()->private->thread_db;
480 int may_ask_gdb = !thread_db->all_symbols_looked_up;
482 /* If we've passed the call to thread_db_look_up_symbols, then
483 anything not in the cache must not exist; we're not interested
484 in any libraries loaded after that point, only in symbols in
485 libpthread.so. It might not be an appropriate time to look
486 up a symbol, e.g. while we're trying to fetch registers. */
487 return look_up_one_symbol (name, addrp, may_ask_gdb);
491 thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
492 CORE_ADDR load_module, CORE_ADDR *address)
496 struct lwp_info *lwp;
497 struct thread_info *saved_thread;
498 struct process_info *proc;
499 struct thread_db *thread_db;
501 proc = get_thread_process (thread);
502 thread_db = proc->private->thread_db;
504 /* If the thread layer is not (yet) initialized, fail. */
505 if (thread_db == NULL || !thread_db->all_symbols_looked_up)
508 /* If td_thr_tls_get_addr is missing rather do not expect td_thr_tlsbase
510 if (thread_db->td_thr_tls_get_addr_p == NULL
511 || (load_module == 0 && thread_db->td_thr_tlsbase_p == NULL))
514 lwp = get_thread_lwp (thread);
515 if (!lwp->thread_known)
516 find_one_thread (thread->entry.id);
517 if (!lwp->thread_known)
520 saved_thread = current_thread;
521 current_thread = thread;
523 if (load_module != 0)
525 /* Note the cast through uintptr_t: this interface only works if
526 a target address fits in a psaddr_t, which is a host pointer.
527 So a 32-bit debugger can not access 64-bit TLS through this. */
528 err = thread_db->td_thr_tls_get_addr_p (&lwp->th,
529 (psaddr_t) (uintptr_t) load_module,
534 /* This code path handles the case of -static -pthread executables:
535 https://sourceware.org/ml/libc-help/2014-03/msg00024.html
536 For older GNU libc r_debug.r_map is NULL. For GNU libc after
537 PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL.
538 The constant number 1 depends on GNU __libc_setup_tls
539 initialization of l_tls_modid to 1. */
540 err = thread_db->td_thr_tlsbase_p (&lwp->th, 1, &addr);
541 addr = (char *) addr + offset;
544 current_thread = saved_thread;
547 *address = (CORE_ADDR) (uintptr_t) addr;
554 #ifdef USE_LIBTHREAD_DB_DIRECTLY
557 thread_db_load_search (void)
560 struct thread_db *tdb;
561 struct process_info *proc = current_process ();
563 gdb_assert (proc->private->thread_db == NULL);
565 tdb = xcalloc (1, sizeof (*tdb));
566 proc->private->thread_db = tdb;
568 tdb->td_ta_new_p = &td_ta_new;
570 /* Attempt to open a connection to the thread library. */
571 err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent);
575 debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err));
577 proc->private->thread_db = NULL;
581 tdb->td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr;
582 tdb->td_thr_get_info_p = &td_thr_get_info;
583 tdb->td_ta_thr_iter_p = &td_ta_thr_iter;
584 tdb->td_symbol_list_p = &td_symbol_list;
586 /* This is required only when thread_db_use_events is on. */
587 tdb->td_thr_event_enable_p = &td_thr_event_enable;
589 /* These are not essential. */
590 tdb->td_ta_event_addr_p = &td_ta_event_addr;
591 tdb->td_ta_set_event_p = &td_ta_set_event;
592 tdb->td_ta_event_getmsg_p = &td_ta_event_getmsg;
593 tdb->td_thr_tls_get_addr_p = &td_thr_tls_get_addr;
594 tdb->td_thr_tlsbase_p = &td_thr_tlsbase;
602 try_thread_db_load_1 (void *handle)
605 struct thread_db *tdb;
606 struct process_info *proc = current_process ();
608 gdb_assert (proc->private->thread_db == NULL);
610 tdb = xcalloc (1, sizeof (*tdb));
611 proc->private->thread_db = tdb;
613 tdb->handle = handle;
615 /* Initialize pointers to the dynamic library functions we will use.
616 Essential functions first. */
618 #define CHK(required, a) \
624 debug_printf ("dlsym: %s\n", dlerror ()); \
628 proc->private->thread_db = NULL; \
635 CHK (1, tdb->td_ta_new_p = dlsym (handle, "td_ta_new"));
637 /* Attempt to open a connection to the thread library. */
638 err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent);
642 debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err));
644 proc->private->thread_db = NULL;
648 CHK (1, tdb->td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"));
649 CHK (1, tdb->td_thr_get_info_p = dlsym (handle, "td_thr_get_info"));
650 CHK (1, tdb->td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"));
651 CHK (1, tdb->td_symbol_list_p = dlsym (handle, "td_symbol_list"));
653 /* This is required only when thread_db_use_events is on. */
654 CHK (thread_db_use_events,
655 tdb->td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"));
657 /* These are not essential. */
658 CHK (0, tdb->td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"));
659 CHK (0, tdb->td_ta_set_event_p = dlsym (handle, "td_ta_set_event"));
660 CHK (0, tdb->td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"));
661 CHK (0, tdb->td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"));
662 CHK (0, tdb->td_thr_tlsbase_p = dlsym (handle, "td_thr_tlsbase"));
671 /* Lookup a library in which given symbol resides.
672 Note: this is looking in the GDBSERVER process, not in the inferior.
673 Returns library name, or NULL. */
676 dladdr_to_soname (const void *addr)
680 if (dladdr (addr, &info) != 0)
681 return info.dli_fname;
688 try_thread_db_load (const char *library)
693 debug_printf ("Trying host libthread_db library: %s.\n",
695 handle = dlopen (library, RTLD_NOW);
699 debug_printf ("dlopen failed: %s.\n", dlerror ());
704 if (debug_threads && strchr (library, '/') == NULL)
708 td_init = dlsym (handle, "td_init");
711 const char *const libpath = dladdr_to_soname (td_init);
714 fprintf (stderr, "Host %s resolved to: %s.\n",
720 if (try_thread_db_load_1 (handle))
723 /* This library "refused" to work on current inferior. */
728 /* Handle $sdir in libthread-db-search-path.
729 Look for libthread_db in the system dirs, or wherever a plain
730 dlopen(file_without_path) will look.
731 The result is true for success. */
734 try_thread_db_load_from_sdir (void)
736 return try_thread_db_load (LIBTHREAD_DB_SO);
739 /* Try to load libthread_db from directory DIR of length DIR_LEN.
740 The result is true for success. */
743 try_thread_db_load_from_dir (const char *dir, size_t dir_len)
747 if (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path))
749 char *cp = xmalloc (dir_len + 1);
751 memcpy (cp, dir, dir_len);
753 warning (_("libthread-db-search-path component too long,"
754 " ignored: %s."), cp);
759 memcpy (path, dir, dir_len);
761 strcpy (path + dir_len + 1, LIBTHREAD_DB_SO);
762 return try_thread_db_load (path);
765 /* Search libthread_db_search_path for libthread_db which "agrees"
766 to work on current inferior.
767 The result is true for success. */
770 thread_db_load_search (void)
772 VEC (char_ptr) *dir_vec;
776 if (libthread_db_search_path == NULL)
777 libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH);
779 dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path);
781 for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i)
783 const int pdir_len = sizeof ("$pdir") - 1;
786 this_dir_len = strlen (this_dir);
788 if (strncmp (this_dir, "$pdir", pdir_len) == 0
789 && (this_dir[pdir_len] == '\0'
790 || this_dir[pdir_len] == '/'))
792 /* We don't maintain a list of loaded libraries so we don't know
793 where libpthread lives. We *could* fetch the info, but we don't
794 do that yet. Ignore it. */
796 else if (strcmp (this_dir, "$sdir") == 0)
798 if (try_thread_db_load_from_sdir ())
806 if (try_thread_db_load_from_dir (this_dir, this_dir_len))
814 free_char_ptr_vec (dir_vec);
816 debug_printf ("thread_db_load_search returning %d\n", rc);
820 #endif /* USE_LIBTHREAD_DB_DIRECTLY */
823 thread_db_init (int use_events)
825 struct process_info *proc = current_process ();
827 /* FIXME drow/2004-10-16: This is the "overall process ID", which
828 GNU/Linux calls tgid, "thread group ID". When we support
829 attaching to threads, the original thread may not be the correct
830 thread. We would have to get the process ID from /proc for NPTL.
831 For LinuxThreads we could do something similar: follow the chain
832 of parent processes until we find the highest one we're attached
833 to, and use its tgid.
835 This isn't the only place in gdbserver that assumes that the first
836 process in the list is the thread group leader. */
838 thread_db_use_events = use_events;
840 if (thread_db_load_search ())
842 if (use_events && thread_db_enable_reporting () == 0)
844 /* Keep trying; maybe event reporting will work later. */
845 thread_db_mourn (proc);
848 thread_db_find_new_threads ();
849 thread_db_look_up_symbols ();
857 any_thread_of (struct inferior_list_entry *entry, void *args)
861 if (ptid_get_pid (entry->id) == *pid_p)
868 switch_to_process (struct process_info *proc)
870 int pid = pid_of (proc);
873 (struct thread_info *) find_inferior (&all_threads,
874 any_thread_of, &pid);
877 /* Disconnect from libthread_db and free resources. */
880 disable_thread_event_reporting (struct process_info *proc)
882 struct thread_db *thread_db = proc->private->thread_db;
885 td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta,
886 td_thr_events_t *event);
888 #ifndef USE_LIBTHREAD_DB_DIRECTLY
889 td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event");
891 td_ta_clear_event_p = &td_ta_clear_event;
894 if (td_ta_clear_event_p != NULL)
896 struct thread_info *saved_thread = current_thread;
897 td_thr_events_t events;
899 switch_to_process (proc);
901 /* Set the process wide mask saying we aren't interested
902 in any events anymore. */
903 td_event_fillset (&events);
904 (*td_ta_clear_event_p) (thread_db->thread_agent, &events);
906 current_thread = saved_thread;
912 remove_thread_event_breakpoints (struct process_info *proc)
914 struct thread_db *thread_db = proc->private->thread_db;
916 if (thread_db->td_create_bp != NULL)
918 struct thread_info *saved_thread = current_thread;
920 switch_to_process (proc);
922 delete_breakpoint (thread_db->td_create_bp);
923 thread_db->td_create_bp = NULL;
925 current_thread = saved_thread;
930 thread_db_detach (struct process_info *proc)
932 struct thread_db *thread_db = proc->private->thread_db;
936 disable_thread_event_reporting (proc);
937 remove_thread_event_breakpoints (proc);
941 /* Disconnect from libthread_db and free resources. */
944 thread_db_mourn (struct process_info *proc)
946 struct thread_db *thread_db = proc->private->thread_db;
949 td_err_e (*td_ta_delete_p) (td_thragent_t *);
951 #ifndef USE_LIBTHREAD_DB_DIRECTLY
952 td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete");
954 td_ta_delete_p = &td_ta_delete;
957 if (td_ta_delete_p != NULL)
958 (*td_ta_delete_p) (thread_db->thread_agent);
960 #ifndef USE_LIBTHREAD_DB_DIRECTLY
961 dlclose (thread_db->handle);
962 #endif /* USE_LIBTHREAD_DB_DIRECTLY */
965 proc->private->thread_db = NULL;
969 /* Handle "set libthread-db-search-path" monitor command and return 1.
970 For any other command, return 0. */
973 thread_db_handle_monitor_command (char *mon)
975 const char *cmd = "set libthread-db-search-path";
976 size_t cmd_len = strlen (cmd);
978 if (strncmp (mon, cmd, cmd_len) == 0
979 && (mon[cmd_len] == '\0'
980 || mon[cmd_len] == ' '))
982 const char *cp = mon + cmd_len;
984 if (libthread_db_search_path != NULL)
985 free (libthread_db_search_path);
987 /* Skip leading space (if any). */
988 while (isspace (*cp))
992 cp = LIBTHREAD_DB_SEARCH_PATH;
993 libthread_db_search_path = xstrdup (cp);
995 monitor_output ("libthread-db-search-path set to `");
996 monitor_output (libthread_db_search_path);
997 monitor_output ("'\n");
1001 /* Tell server.c to perform default processing. */