1 /* Thread management interface, for the remote server for GDB.
2 Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
5 Contributed by MontaVista Software.
7 This file is part of GDB.
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
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
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.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include "linux-low.h"
26 extern int debug_threads
;
28 static int thread_db_use_events
;
30 #include "gdb_proc_service.h"
31 #include "../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 const char ** (*td_symbol_list_p
) (void);
94 static char *libthread_db_search_path
;
96 static int find_one_thread (ptid_t
);
97 static int find_new_threads_callback (const td_thrhandle_t
*th_p
, void *data
);
100 thread_db_err_str (td_err_e err
)
107 return "generic 'call succeeded'";
109 return "generic error";
111 return "no thread to satisfy query";
113 return "no sync handle to satisfy query";
115 return "no LWP to satisfy query";
117 return "invalid process handle";
119 return "invalid thread handle";
121 return "invalid synchronization handle";
123 return "invalid thread agent";
125 return "invalid key";
127 return "no event message for getmsg";
129 return "FPU register set not available";
131 return "application not linked with libthread";
133 return "requested event is not supported";
135 return "capability not available";
137 return "debugger service failed";
139 return "operation not applicable to";
141 return "no thread-specific data for this thread";
143 return "malloc failed";
145 return "only part of register set was written/read";
147 return "X register set not available for this thread";
148 #ifdef HAVE_TD_VERSION
150 return "version mismatch between libthread_db and libpthread";
153 xsnprintf (buf
, sizeof (buf
), "unknown thread_db error '%d'", err
);
160 thread_db_state_str (td_thr_state_e state
)
167 return "stopped by debugger";
176 case TD_THR_STOPPED_ASLEEP
:
177 return "stopped by debugger AND blocked";
179 xsnprintf (buf
, sizeof (buf
), "unknown thread_db state %d", state
);
186 thread_db_create_event (CORE_ADDR where
)
190 struct lwp_info
*lwp
;
191 struct thread_db
*thread_db
= current_process ()->private->thread_db
;
193 if (thread_db
->td_ta_event_getmsg_p
== NULL
)
194 fatal ("unexpected thread_db->td_ta_event_getmsg_p == NULL");
197 fprintf (stderr
, "Thread creation event.\n");
199 /* FIXME: This assumes we don't get another event.
200 In the LinuxThreads implementation, this is safe,
201 because all events come from the manager thread
202 (except for its own creation, of course). */
203 err
= thread_db
->td_ta_event_getmsg_p (thread_db
->thread_agent
, &msg
);
205 fprintf (stderr
, "thread getmsg err: %s\n",
206 thread_db_err_str (err
));
208 /* If we do not know about the main thread yet, this would be a good time to
209 find it. We need to do this to pick up the main thread before any newly
211 lwp
= get_thread_lwp (current_inferior
);
212 if (lwp
->thread_known
== 0)
213 find_one_thread (lwp
->head
.id
);
215 /* msg.event == TD_EVENT_CREATE */
217 find_new_threads_callback (msg
.th_p
, NULL
);
223 thread_db_enable_reporting (void)
225 td_thr_events_t events
;
228 struct thread_db
*thread_db
= current_process ()->private->thread_db
;
230 if (thread_db
->td_ta_set_event_p
== NULL
231 || thread_db
->td_ta_event_addr_p
== NULL
232 || thread_db
->td_ta_event_getmsg_p
== NULL
)
233 /* This libthread_db is missing required support. */
236 /* Set the process wide mask saying which events we're interested in. */
237 td_event_emptyset (&events
);
238 td_event_addset (&events
, TD_CREATE
);
240 err
= thread_db
->td_ta_set_event_p (thread_db
->thread_agent
, &events
);
243 warning ("Unable to set global thread event mask: %s",
244 thread_db_err_str (err
));
248 /* Get address for thread creation breakpoint. */
249 err
= thread_db
->td_ta_event_addr_p (thread_db
->thread_agent
, TD_CREATE
,
253 warning ("Unable to get location for thread creation breakpoint: %s",
254 thread_db_err_str (err
));
257 thread_db
->td_create_bp
258 = set_breakpoint_at ((CORE_ADDR
) (unsigned long) notify
.u
.bptaddr
,
259 thread_db_create_event
);
265 find_one_thread (ptid_t ptid
)
270 struct thread_info
*inferior
;
271 struct lwp_info
*lwp
;
272 struct thread_db
*thread_db
= current_process ()->private->thread_db
;
273 int lwpid
= ptid_get_lwp (ptid
);
275 inferior
= (struct thread_info
*) find_inferior_id (&all_threads
, ptid
);
276 lwp
= get_thread_lwp (inferior
);
277 if (lwp
->thread_known
)
280 /* Get information about this thread. */
281 err
= thread_db
->td_ta_map_lwp2thr_p (thread_db
->thread_agent
, lwpid
, &th
);
283 error ("Cannot get thread handle for LWP %d: %s",
284 lwpid
, thread_db_err_str (err
));
286 err
= thread_db
->td_thr_get_info_p (&th
, &ti
);
288 error ("Cannot get thread info for LWP %d: %s",
289 lwpid
, thread_db_err_str (err
));
292 fprintf (stderr
, "Found thread %ld (LWP %d)\n",
293 ti
.ti_tid
, ti
.ti_lid
);
295 if (lwpid
!= ti
.ti_lid
)
297 warning ("PID mismatch! Expected %ld, got %ld",
298 (long) lwpid
, (long) ti
.ti_lid
);
302 if (thread_db_use_events
)
304 err
= thread_db
->td_thr_event_enable_p (&th
, 1);
306 error ("Cannot enable thread event reporting for %d: %s",
307 ti
.ti_lid
, thread_db_err_str (err
));
310 /* If the new thread ID is zero, a final thread ID will be available
311 later. Do not enable thread debugging yet. */
315 lwp
->thread_known
= 1;
321 /* Attach a thread. Return true on success. */
324 attach_thread (const td_thrhandle_t
*th_p
, td_thrinfo_t
*ti_p
)
326 struct lwp_info
*lwp
;
329 fprintf (stderr
, "Attaching to thread %ld (LWP %d)\n",
330 ti_p
->ti_tid
, ti_p
->ti_lid
);
331 linux_attach_lwp (ti_p
->ti_lid
);
332 lwp
= find_lwp_pid (pid_to_ptid (ti_p
->ti_lid
));
335 warning ("Could not attach to thread %ld (LWP %d)\n",
336 ti_p
->ti_tid
, ti_p
->ti_lid
);
340 lwp
->thread_known
= 1;
343 if (thread_db_use_events
)
346 struct thread_db
*thread_db
= current_process ()->private->thread_db
;
348 err
= thread_db
->td_thr_event_enable_p (th_p
, 1);
350 error ("Cannot enable thread event reporting for %d: %s",
351 ti_p
->ti_lid
, thread_db_err_str (err
));
357 /* Attach thread if we haven't seen it yet.
358 Increment *COUNTER if we have attached a new thread.
359 Return false on failure. */
362 maybe_attach_thread (const td_thrhandle_t
*th_p
, td_thrinfo_t
*ti_p
,
365 struct lwp_info
*lwp
;
367 lwp
= find_lwp_pid (pid_to_ptid (ti_p
->ti_lid
));
371 if (!attach_thread (th_p
, ti_p
))
381 find_new_threads_callback (const td_thrhandle_t
*th_p
, void *data
)
385 struct thread_db
*thread_db
= current_process ()->private->thread_db
;
387 err
= thread_db
->td_thr_get_info_p (th_p
, &ti
);
389 error ("Cannot get thread info: %s", thread_db_err_str (err
));
391 /* Check for zombies. */
392 if (ti
.ti_state
== TD_THR_UNKNOWN
|| ti
.ti_state
== TD_THR_ZOMBIE
)
395 if (!maybe_attach_thread (th_p
, &ti
, (int *) data
))
397 /* Terminate iteration early: we might be looking at stale data in
398 the inferior. The thread_db_find_new_threads will retry. */
406 thread_db_find_new_threads (void)
409 ptid_t ptid
= ((struct inferior_list_entry
*) current_inferior
)->id
;
410 struct thread_db
*thread_db
= current_process ()->private->thread_db
;
413 /* This function is only called when we first initialize thread_db.
414 First locate the initial thread. If it is not ready for
415 debugging yet, then stop. */
416 if (find_one_thread (ptid
) == 0)
419 /* Require 4 successive iterations which do not find any new threads.
420 The 4 is a heuristic: there is an inherent race here, and I have
421 seen that 2 iterations in a row are not always sufficient to
422 "capture" all threads. */
423 for (loop
= 0, iteration
= 0; loop
< 4; ++loop
, ++iteration
)
425 int new_thread_count
= 0;
427 /* Iterate over all user-space threads to discover new threads. */
428 err
= thread_db
->td_ta_thr_iter_p (thread_db
->thread_agent
,
429 find_new_threads_callback
,
431 TD_THR_ANY_STATE
, TD_THR_LOWEST_PRIORITY
,
432 TD_SIGNO_MASK
, TD_THR_ANY_USER_FLAGS
);
434 fprintf (stderr
, "Found %d threads in iteration %d.\n",
435 new_thread_count
, iteration
);
437 if (new_thread_count
!= 0)
439 /* Found new threads. Restart iteration from beginning. */
444 error ("Cannot find new threads: %s", thread_db_err_str (err
));
447 /* Cache all future symbols that thread_db might request. We can not
448 request symbols at arbitrary states in the remote protocol, only
449 when the client tells us that new symbols are available. So when
450 we load the thread library, make sure to check the entire list. */
453 thread_db_look_up_symbols (void)
455 struct thread_db
*thread_db
= current_process ()->private->thread_db
;
456 const char **sym_list
;
459 for (sym_list
= thread_db
->td_symbol_list_p (); *sym_list
; sym_list
++)
460 look_up_one_symbol (*sym_list
, &unused
, 1);
462 /* We're not interested in any other libraries loaded after this
463 point, only in symbols in libpthread.so. */
464 thread_db
->all_symbols_looked_up
= 1;
468 thread_db_look_up_one_symbol (const char *name
, CORE_ADDR
*addrp
)
470 struct thread_db
*thread_db
= current_process ()->private->thread_db
;
471 int may_ask_gdb
= !thread_db
->all_symbols_looked_up
;
473 /* If we've passed the call to thread_db_look_up_symbols, then
474 anything not in the cache must not exist; we're not interested
475 in any libraries loaded after that point, only in symbols in
476 libpthread.so. It might not be an appropriate time to look
477 up a symbol, e.g. while we're trying to fetch registers. */
478 return look_up_one_symbol (name
, addrp
, may_ask_gdb
);
482 thread_db_get_tls_address (struct thread_info
*thread
, CORE_ADDR offset
,
483 CORE_ADDR load_module
, CORE_ADDR
*address
)
487 struct lwp_info
*lwp
;
488 struct thread_info
*saved_inferior
;
489 struct process_info
*proc
;
490 struct thread_db
*thread_db
;
492 proc
= get_thread_process (thread
);
493 thread_db
= proc
->private->thread_db
;
495 /* If the thread layer is not (yet) initialized, fail. */
496 if (!thread_db
->all_symbols_looked_up
)
499 if (thread_db
->td_thr_tls_get_addr_p
== NULL
)
502 lwp
= get_thread_lwp (thread
);
503 if (!lwp
->thread_known
)
504 find_one_thread (lwp
->head
.id
);
505 if (!lwp
->thread_known
)
508 saved_inferior
= current_inferior
;
509 current_inferior
= thread
;
510 /* Note the cast through uintptr_t: this interface only works if
511 a target address fits in a psaddr_t, which is a host pointer.
512 So a 32-bit debugger can not access 64-bit TLS through this. */
513 err
= thread_db
->td_thr_tls_get_addr_p (&lwp
->th
,
514 (psaddr_t
) (uintptr_t) load_module
,
516 current_inferior
= saved_inferior
;
519 *address
= (CORE_ADDR
) (uintptr_t) addr
;
526 #ifdef USE_LIBTHREAD_DB_DIRECTLY
529 thread_db_load_search (void)
532 struct thread_db
*tdb
;
533 struct process_info
*proc
= current_process ();
535 if (proc
->private->thread_db
!= NULL
)
536 fatal ("unexpected: proc->private->thread_db != NULL");
538 tdb
= xcalloc (1, sizeof (*tdb
));
539 proc
->private->thread_db
= tdb
;
541 tdb
->td_ta_new_p
= &td_ta_new
;
543 /* Attempt to open a connection to the thread library. */
544 err
= tdb
->td_ta_new_p (&tdb
->proc_handle
, &tdb
->thread_agent
);
548 fprintf (stderr
, "td_ta_new(): %s\n", thread_db_err_str (err
));
550 proc
->private->thread_db
= NULL
;
554 tdb
->td_ta_map_lwp2thr_p
= &td_ta_map_lwp2thr
;
555 tdb
->td_thr_get_info_p
= &td_thr_get_info
;
556 tdb
->td_ta_thr_iter_p
= &td_ta_thr_iter
;
557 tdb
->td_symbol_list_p
= &td_symbol_list
;
559 /* This is required only when thread_db_use_events is on. */
560 tdb
->td_thr_event_enable_p
= &td_thr_event_enable
;
562 /* These are not essential. */
563 tdb
->td_ta_event_addr_p
= &td_ta_event_addr
;
564 tdb
->td_ta_set_event_p
= &td_ta_set_event
;
565 tdb
->td_ta_event_getmsg_p
= &td_ta_event_getmsg
;
566 tdb
->td_thr_tls_get_addr_p
= &td_thr_tls_get_addr
;
574 try_thread_db_load_1 (void *handle
)
577 struct thread_db
*tdb
;
578 struct process_info
*proc
= current_process ();
580 if (proc
->private->thread_db
!= NULL
)
581 fatal ("unexpected: proc->private->thread_db != NULL");
583 tdb
= xcalloc (1, sizeof (*tdb
));
584 proc
->private->thread_db
= tdb
;
586 tdb
->handle
= handle
;
588 /* Initialize pointers to the dynamic library functions we will use.
589 Essential functions first. */
591 #define CHK(required, a) \
597 fprintf (stderr, "dlsym: %s\n", dlerror ()); \
601 proc->private->thread_db = NULL; \
608 CHK (1, tdb
->td_ta_new_p
= dlsym (handle
, "td_ta_new"));
610 /* Attempt to open a connection to the thread library. */
611 err
= tdb
->td_ta_new_p (&tdb
->proc_handle
, &tdb
->thread_agent
);
615 fprintf (stderr
, "td_ta_new(): %s\n", thread_db_err_str (err
));
617 proc
->private->thread_db
= NULL
;
621 CHK (1, tdb
->td_ta_map_lwp2thr_p
= dlsym (handle
, "td_ta_map_lwp2thr"));
622 CHK (1, tdb
->td_thr_get_info_p
= dlsym (handle
, "td_thr_get_info"));
623 CHK (1, tdb
->td_ta_thr_iter_p
= dlsym (handle
, "td_ta_thr_iter"));
624 CHK (1, tdb
->td_symbol_list_p
= dlsym (handle
, "td_symbol_list"));
626 /* This is required only when thread_db_use_events is on. */
627 CHK (thread_db_use_events
,
628 tdb
->td_thr_event_enable_p
= dlsym (handle
, "td_thr_event_enable"));
630 /* These are not essential. */
631 CHK (0, tdb
->td_ta_event_addr_p
= dlsym (handle
, "td_ta_event_addr"));
632 CHK (0, tdb
->td_ta_set_event_p
= dlsym (handle
, "td_ta_set_event"));
633 CHK (0, tdb
->td_ta_event_getmsg_p
= dlsym (handle
, "td_ta_event_getmsg"));
634 CHK (0, tdb
->td_thr_tls_get_addr_p
= dlsym (handle
, "td_thr_tls_get_addr"));
643 /* Lookup a library in which given symbol resides.
644 Note: this is looking in the GDBSERVER process, not in the inferior.
645 Returns library name, or NULL. */
648 dladdr_to_soname (const void *addr
)
652 if (dladdr (addr
, &info
) != 0)
653 return info
.dli_fname
;
660 try_thread_db_load (const char *library
)
665 fprintf (stderr
, "Trying host libthread_db library: %s.\n",
667 handle
= dlopen (library
, RTLD_NOW
);
671 fprintf (stderr
, "dlopen failed: %s.\n", dlerror ());
676 if (debug_threads
&& strchr (library
, '/') == NULL
)
680 td_init
= dlsym (handle
, "td_init");
683 const char *const libpath
= dladdr_to_soname (td_init
);
686 fprintf (stderr
, "Host %s resolved to: %s.\n",
692 if (try_thread_db_load_1 (handle
))
695 /* This library "refused" to work on current inferior. */
701 thread_db_load_search (void)
704 const char *search_path
;
707 if (libthread_db_search_path
== NULL
)
708 libthread_db_search_path
= xstrdup (LIBTHREAD_DB_SEARCH_PATH
);
710 search_path
= libthread_db_search_path
;
713 const char *end
= strchr (search_path
, ':');
716 size_t len
= end
- search_path
;
717 if (len
+ 1 + strlen (LIBTHREAD_DB_SO
) + 1 > sizeof (path
))
719 char *cp
= xmalloc (len
+ 1);
720 memcpy (cp
, search_path
, len
);
722 warning ("libthread_db_search_path component too long, "
725 search_path
+= len
+ 1;
728 memcpy (path
, search_path
, len
);
730 search_path
+= len
+ 1;
734 size_t len
= strlen (search_path
);
736 if (len
+ 1 + strlen (LIBTHREAD_DB_SO
) + 1 > sizeof (path
))
738 warning ("libthread_db_search_path component too long,"
739 " ignored: %s.", search_path
);
742 memcpy (path
, search_path
, len
+ 1);
746 strcat (path
, LIBTHREAD_DB_SO
);
748 fprintf (stderr
, "thread_db_load_search trying %s\n", path
);
749 if (try_thread_db_load (path
))
756 rc
= try_thread_db_load (LIBTHREAD_DB_SO
);
759 fprintf (stderr
, "thread_db_load_search returning %d\n", rc
);
763 #endif /* USE_LIBTHREAD_DB_DIRECTLY */
766 thread_db_init (int use_events
)
768 struct process_info
*proc
= current_process ();
770 /* FIXME drow/2004-10-16: This is the "overall process ID", which
771 GNU/Linux calls tgid, "thread group ID". When we support
772 attaching to threads, the original thread may not be the correct
773 thread. We would have to get the process ID from /proc for NPTL.
774 For LinuxThreads we could do something similar: follow the chain
775 of parent processes until we find the highest one we're attached
776 to, and use its tgid.
778 This isn't the only place in gdbserver that assumes that the first
779 process in the list is the thread group leader. */
781 thread_db_use_events
= use_events
;
783 if (thread_db_load_search ())
785 if (use_events
&& thread_db_enable_reporting () == 0)
787 /* Keep trying; maybe event reporting will work later. */
788 thread_db_mourn (proc
);
791 thread_db_find_new_threads ();
792 thread_db_look_up_symbols ();
800 any_thread_of (struct inferior_list_entry
*entry
, void *args
)
804 if (ptid_get_pid (entry
->id
) == *pid_p
)
811 switch_to_process (struct process_info
*proc
)
813 int pid
= pid_of (proc
);
816 (struct thread_info
*) find_inferior (&all_threads
,
817 any_thread_of
, &pid
);
820 /* Disconnect from libthread_db and free resources. */
823 disable_thread_event_reporting (struct process_info
*proc
)
825 struct thread_db
*thread_db
= proc
->private->thread_db
;
828 td_err_e (*td_ta_clear_event_p
) (const td_thragent_t
*ta
,
829 td_thr_events_t
*event
);
831 #ifndef USE_LIBTHREAD_DB_DIRECTLY
832 td_ta_clear_event_p
= dlsym (thread_db
->handle
, "td_ta_clear_event");
834 td_ta_clear_event_p
= &td_ta_clear_event
;
837 if (td_ta_clear_event_p
!= NULL
)
839 struct thread_info
*saved_inferior
= current_inferior
;
840 td_thr_events_t events
;
842 switch_to_process (proc
);
844 /* Set the process wide mask saying we aren't interested
845 in any events anymore. */
846 td_event_fillset (&events
);
847 (*td_ta_clear_event_p
) (thread_db
->thread_agent
, &events
);
849 current_inferior
= saved_inferior
;
855 remove_thread_event_breakpoints (struct process_info
*proc
)
857 struct thread_db
*thread_db
= proc
->private->thread_db
;
859 if (thread_db
->td_create_bp
!= NULL
)
861 struct thread_info
*saved_inferior
= current_inferior
;
863 switch_to_process (proc
);
865 delete_breakpoint (thread_db
->td_create_bp
);
866 thread_db
->td_create_bp
= NULL
;
868 current_inferior
= saved_inferior
;
873 thread_db_detach (struct process_info
*proc
)
875 struct thread_db
*thread_db
= proc
->private->thread_db
;
879 disable_thread_event_reporting (proc
);
880 remove_thread_event_breakpoints (proc
);
884 /* Disconnect from libthread_db and free resources. */
887 thread_db_mourn (struct process_info
*proc
)
889 struct thread_db
*thread_db
= proc
->private->thread_db
;
892 td_err_e (*td_ta_delete_p
) (td_thragent_t
*);
894 #ifndef USE_LIBTHREAD_DB_DIRECTLY
895 td_ta_delete_p
= dlsym (thread_db
->handle
, "td_ta_delete");
897 td_ta_delete_p
= &td_ta_delete
;
900 if (td_ta_delete_p
!= NULL
)
901 (*td_ta_delete_p
) (thread_db
->thread_agent
);
903 #ifndef USE_LIBTHREAD_DB_DIRECTLY
904 dlclose (thread_db
->handle
);
905 #endif /* USE_LIBTHREAD_DB_DIRECTLY */
908 proc
->private->thread_db
= NULL
;
912 /* Handle "set libthread-db-search-path" monitor command and return 1.
913 For any other command, return 0. */
916 thread_db_handle_monitor_command (char *mon
)
918 if (strncmp (mon
, "set libthread-db-search-path ", 29) == 0)
920 const char *cp
= mon
+ 29;
922 if (libthread_db_search_path
!= NULL
)
923 free (libthread_db_search_path
);
925 /* Skip leading space (if any). */
926 while (isspace (*cp
))
929 libthread_db_search_path
= xstrdup (cp
);
931 monitor_output ("libthread-db-search-path set to `");
932 monitor_output (libthread_db_search_path
);
933 monitor_output ("'\n");
937 /* Tell server.c to perform default processing. */