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));
401 /* A thread with kernel thread ID -1 is either a thread that
402 exited and was joined, or a thread that is being created but
403 hasn't started yet, and that is reusing the tcb/stack of a
404 thread that previously exited and was joined. (glibc marks
405 terminated and joined threads with kernel thread ID -1. See
410 /* Check for zombies. */
411 if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
414 if (!maybe_attach_thread (th_p, &ti, (int *) data))
416 /* Terminate iteration early: we might be looking at stale data in
417 the inferior. The thread_db_find_new_threads will retry. */
425 thread_db_find_new_threads (void)
428 ptid_t ptid = current_ptid;
429 struct thread_db *thread_db = current_process ()->private->thread_db;
432 /* This function is only called when we first initialize thread_db.
433 First locate the initial thread. If it is not ready for
434 debugging yet, then stop. */
435 if (find_one_thread (ptid) == 0)
438 /* Require 4 successive iterations which do not find any new threads.
439 The 4 is a heuristic: there is an inherent race here, and I have
440 seen that 2 iterations in a row are not always sufficient to
441 "capture" all threads. */
442 for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration)
444 int new_thread_count = 0;
446 /* Iterate over all user-space threads to discover new threads. */
447 err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent,
448 find_new_threads_callback,
451 TD_THR_LOWEST_PRIORITY,
452 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
454 debug_printf ("Found %d threads in iteration %d.\n",
455 new_thread_count, iteration);
457 if (new_thread_count != 0)
459 /* Found new threads. Restart iteration from beginning. */
464 error ("Cannot find new threads: %s", thread_db_err_str (err));
467 /* Cache all future symbols that thread_db might request. We can not
468 request symbols at arbitrary states in the remote protocol, only
469 when the client tells us that new symbols are available. So when
470 we load the thread library, make sure to check the entire list. */
473 thread_db_look_up_symbols (void)
475 struct thread_db *thread_db = current_process ()->private->thread_db;
476 const char **sym_list;
479 for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++)
480 look_up_one_symbol (*sym_list, &unused, 1);
482 /* We're not interested in any other libraries loaded after this
483 point, only in symbols in libpthread.so. */
484 thread_db->all_symbols_looked_up = 1;
488 thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp)
490 struct thread_db *thread_db = current_process ()->private->thread_db;
491 int may_ask_gdb = !thread_db->all_symbols_looked_up;
493 /* If we've passed the call to thread_db_look_up_symbols, then
494 anything not in the cache must not exist; we're not interested
495 in any libraries loaded after that point, only in symbols in
496 libpthread.so. It might not be an appropriate time to look
497 up a symbol, e.g. while we're trying to fetch registers. */
498 return look_up_one_symbol (name, addrp, may_ask_gdb);
502 thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
503 CORE_ADDR load_module, CORE_ADDR *address)
507 struct lwp_info *lwp;
508 struct thread_info *saved_thread;
509 struct process_info *proc;
510 struct thread_db *thread_db;
512 proc = get_thread_process (thread);
513 thread_db = proc->private->thread_db;
515 /* If the thread layer is not (yet) initialized, fail. */
516 if (thread_db == NULL || !thread_db->all_symbols_looked_up)
519 /* If td_thr_tls_get_addr is missing rather do not expect td_thr_tlsbase
521 if (thread_db->td_thr_tls_get_addr_p == NULL
522 || (load_module == 0 && thread_db->td_thr_tlsbase_p == NULL))
525 lwp = get_thread_lwp (thread);
526 if (!lwp->thread_known)
527 find_one_thread (thread->entry.id);
528 if (!lwp->thread_known)
531 saved_thread = current_thread;
532 current_thread = thread;
534 if (load_module != 0)
536 /* Note the cast through uintptr_t: this interface only works if
537 a target address fits in a psaddr_t, which is a host pointer.
538 So a 32-bit debugger can not access 64-bit TLS through this. */
539 err = thread_db->td_thr_tls_get_addr_p (&lwp->th,
540 (psaddr_t) (uintptr_t) load_module,
545 /* This code path handles the case of -static -pthread executables:
546 https://sourceware.org/ml/libc-help/2014-03/msg00024.html
547 For older GNU libc r_debug.r_map is NULL. For GNU libc after
548 PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL.
549 The constant number 1 depends on GNU __libc_setup_tls
550 initialization of l_tls_modid to 1. */
551 err = thread_db->td_thr_tlsbase_p (&lwp->th, 1, &addr);
552 addr = (char *) addr + offset;
555 current_thread = saved_thread;
558 *address = (CORE_ADDR) (uintptr_t) addr;
565 #ifdef USE_LIBTHREAD_DB_DIRECTLY
568 thread_db_load_search (void)
571 struct thread_db *tdb;
572 struct process_info *proc = current_process ();
574 gdb_assert (proc->private->thread_db == NULL);
576 tdb = xcalloc (1, sizeof (*tdb));
577 proc->private->thread_db = tdb;
579 tdb->td_ta_new_p = &td_ta_new;
581 /* Attempt to open a connection to the thread library. */
582 err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent);
586 debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err));
588 proc->private->thread_db = NULL;
592 tdb->td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr;
593 tdb->td_thr_get_info_p = &td_thr_get_info;
594 tdb->td_ta_thr_iter_p = &td_ta_thr_iter;
595 tdb->td_symbol_list_p = &td_symbol_list;
597 /* This is required only when thread_db_use_events is on. */
598 tdb->td_thr_event_enable_p = &td_thr_event_enable;
600 /* These are not essential. */
601 tdb->td_ta_event_addr_p = &td_ta_event_addr;
602 tdb->td_ta_set_event_p = &td_ta_set_event;
603 tdb->td_ta_event_getmsg_p = &td_ta_event_getmsg;
604 tdb->td_thr_tls_get_addr_p = &td_thr_tls_get_addr;
605 tdb->td_thr_tlsbase_p = &td_thr_tlsbase;
613 try_thread_db_load_1 (void *handle)
616 struct thread_db *tdb;
617 struct process_info *proc = current_process ();
619 gdb_assert (proc->private->thread_db == NULL);
621 tdb = xcalloc (1, sizeof (*tdb));
622 proc->private->thread_db = tdb;
624 tdb->handle = handle;
626 /* Initialize pointers to the dynamic library functions we will use.
627 Essential functions first. */
629 #define CHK(required, a) \
635 debug_printf ("dlsym: %s\n", dlerror ()); \
639 proc->private->thread_db = NULL; \
646 CHK (1, tdb->td_ta_new_p = dlsym (handle, "td_ta_new"));
648 /* Attempt to open a connection to the thread library. */
649 err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent);
653 debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err));
655 proc->private->thread_db = NULL;
659 CHK (1, tdb->td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"));
660 CHK (1, tdb->td_thr_get_info_p = dlsym (handle, "td_thr_get_info"));
661 CHK (1, tdb->td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"));
662 CHK (1, tdb->td_symbol_list_p = dlsym (handle, "td_symbol_list"));
664 /* This is required only when thread_db_use_events is on. */
665 CHK (thread_db_use_events,
666 tdb->td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"));
668 /* These are not essential. */
669 CHK (0, tdb->td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"));
670 CHK (0, tdb->td_ta_set_event_p = dlsym (handle, "td_ta_set_event"));
671 CHK (0, tdb->td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"));
672 CHK (0, tdb->td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"));
673 CHK (0, tdb->td_thr_tlsbase_p = dlsym (handle, "td_thr_tlsbase"));
682 /* Lookup a library in which given symbol resides.
683 Note: this is looking in the GDBSERVER process, not in the inferior.
684 Returns library name, or NULL. */
687 dladdr_to_soname (const void *addr)
691 if (dladdr (addr, &info) != 0)
692 return info.dli_fname;
699 try_thread_db_load (const char *library)
704 debug_printf ("Trying host libthread_db library: %s.\n",
706 handle = dlopen (library, RTLD_NOW);
710 debug_printf ("dlopen failed: %s.\n", dlerror ());
715 if (debug_threads && strchr (library, '/') == NULL)
719 td_init = dlsym (handle, "td_init");
722 const char *const libpath = dladdr_to_soname (td_init);
725 fprintf (stderr, "Host %s resolved to: %s.\n",
731 if (try_thread_db_load_1 (handle))
734 /* This library "refused" to work on current inferior. */
739 /* Handle $sdir in libthread-db-search-path.
740 Look for libthread_db in the system dirs, or wherever a plain
741 dlopen(file_without_path) will look.
742 The result is true for success. */
745 try_thread_db_load_from_sdir (void)
747 return try_thread_db_load (LIBTHREAD_DB_SO);
750 /* Try to load libthread_db from directory DIR of length DIR_LEN.
751 The result is true for success. */
754 try_thread_db_load_from_dir (const char *dir, size_t dir_len)
758 if (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path))
760 char *cp = xmalloc (dir_len + 1);
762 memcpy (cp, dir, dir_len);
764 warning (_("libthread-db-search-path component too long,"
765 " ignored: %s."), cp);
770 memcpy (path, dir, dir_len);
772 strcpy (path + dir_len + 1, LIBTHREAD_DB_SO);
773 return try_thread_db_load (path);
776 /* Search libthread_db_search_path for libthread_db which "agrees"
777 to work on current inferior.
778 The result is true for success. */
781 thread_db_load_search (void)
783 VEC (char_ptr) *dir_vec;
787 if (libthread_db_search_path == NULL)
788 libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH);
790 dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path);
792 for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i)
794 const int pdir_len = sizeof ("$pdir") - 1;
797 this_dir_len = strlen (this_dir);
799 if (strncmp (this_dir, "$pdir", pdir_len) == 0
800 && (this_dir[pdir_len] == '\0'
801 || this_dir[pdir_len] == '/'))
803 /* We don't maintain a list of loaded libraries so we don't know
804 where libpthread lives. We *could* fetch the info, but we don't
805 do that yet. Ignore it. */
807 else if (strcmp (this_dir, "$sdir") == 0)
809 if (try_thread_db_load_from_sdir ())
817 if (try_thread_db_load_from_dir (this_dir, this_dir_len))
825 free_char_ptr_vec (dir_vec);
827 debug_printf ("thread_db_load_search returning %d\n", rc);
831 #endif /* USE_LIBTHREAD_DB_DIRECTLY */
834 thread_db_init (int use_events)
836 struct process_info *proc = current_process ();
838 /* FIXME drow/2004-10-16: This is the "overall process ID", which
839 GNU/Linux calls tgid, "thread group ID". When we support
840 attaching to threads, the original thread may not be the correct
841 thread. We would have to get the process ID from /proc for NPTL.
842 For LinuxThreads we could do something similar: follow the chain
843 of parent processes until we find the highest one we're attached
844 to, and use its tgid.
846 This isn't the only place in gdbserver that assumes that the first
847 process in the list is the thread group leader. */
849 thread_db_use_events = use_events;
851 if (thread_db_load_search ())
853 if (use_events && thread_db_enable_reporting () == 0)
855 /* Keep trying; maybe event reporting will work later. */
856 thread_db_mourn (proc);
859 thread_db_find_new_threads ();
860 thread_db_look_up_symbols ();
868 any_thread_of (struct inferior_list_entry *entry, void *args)
872 if (ptid_get_pid (entry->id) == *pid_p)
879 switch_to_process (struct process_info *proc)
881 int pid = pid_of (proc);
884 (struct thread_info *) find_inferior (&all_threads,
885 any_thread_of, &pid);
888 /* Disconnect from libthread_db and free resources. */
891 disable_thread_event_reporting (struct process_info *proc)
893 struct thread_db *thread_db = proc->private->thread_db;
896 td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta,
897 td_thr_events_t *event);
899 #ifndef USE_LIBTHREAD_DB_DIRECTLY
900 td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event");
902 td_ta_clear_event_p = &td_ta_clear_event;
905 if (td_ta_clear_event_p != NULL)
907 struct thread_info *saved_thread = current_thread;
908 td_thr_events_t events;
910 switch_to_process (proc);
912 /* Set the process wide mask saying we aren't interested
913 in any events anymore. */
914 td_event_fillset (&events);
915 (*td_ta_clear_event_p) (thread_db->thread_agent, &events);
917 current_thread = saved_thread;
923 remove_thread_event_breakpoints (struct process_info *proc)
925 struct thread_db *thread_db = proc->private->thread_db;
927 if (thread_db->td_create_bp != NULL)
929 struct thread_info *saved_thread = current_thread;
931 switch_to_process (proc);
933 delete_breakpoint (thread_db->td_create_bp);
934 thread_db->td_create_bp = NULL;
936 current_thread = saved_thread;
941 thread_db_detach (struct process_info *proc)
943 struct thread_db *thread_db = proc->private->thread_db;
947 disable_thread_event_reporting (proc);
948 remove_thread_event_breakpoints (proc);
952 /* Disconnect from libthread_db and free resources. */
955 thread_db_mourn (struct process_info *proc)
957 struct thread_db *thread_db = proc->private->thread_db;
960 td_err_e (*td_ta_delete_p) (td_thragent_t *);
962 #ifndef USE_LIBTHREAD_DB_DIRECTLY
963 td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete");
965 td_ta_delete_p = &td_ta_delete;
968 if (td_ta_delete_p != NULL)
969 (*td_ta_delete_p) (thread_db->thread_agent);
971 #ifndef USE_LIBTHREAD_DB_DIRECTLY
972 dlclose (thread_db->handle);
973 #endif /* USE_LIBTHREAD_DB_DIRECTLY */
976 proc->private->thread_db = NULL;
980 /* Handle "set libthread-db-search-path" monitor command and return 1.
981 For any other command, return 0. */
984 thread_db_handle_monitor_command (char *mon)
986 const char *cmd = "set libthread-db-search-path";
987 size_t cmd_len = strlen (cmd);
989 if (strncmp (mon, cmd, cmd_len) == 0
990 && (mon[cmd_len] == '\0'
991 || mon[cmd_len] == ' '))
993 const char *cp = mon + cmd_len;
995 if (libthread_db_search_path != NULL)
996 free (libthread_db_search_path);
998 /* Skip leading space (if any). */
999 while (isspace (*cp))
1003 cp = LIBTHREAD_DB_SEARCH_PATH;
1004 libthread_db_search_path = xstrdup (cp);
1006 monitor_output ("libthread-db-search-path set to `");
1007 monitor_output (libthread_db_search_path);
1008 monitor_output ("'\n");
1012 /* Tell server.c to perform default processing. */