/* Thread management interface, for the remote server for GDB.
- Copyright 2002
+ Copyright (C) 2002, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Free Software Foundation, Inc.
Contributed by MontaVista Software.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "server.h"
extern int debug_threads;
-#ifdef HAVE_THREAD_DB_H
-#include <thread_db.h>
-#endif
+static int thread_db_use_events;
-/* Correct for all GNU/Linux targets (for quite some time). */
-#define GDB_GREGSET_T elf_gregset_t
-#define GDB_FPREGSET_T elf_fpregset_t
+#include "gdb_proc_service.h"
+#include "../gdb_thread_db.h"
-#ifndef HAVE_ELF_FPREGSET_T
-/* Make sure we have said types. Not all platforms bring in <linux/elf.h>
- via <sys/procfs.h>. */
-#ifdef HAVE_LINUX_ELF_H
-#include <linux/elf.h>
-#endif
+#ifndef USE_LIBTHREAD_DB_DIRECTLY
+#include <dlfcn.h>
#endif
-#include "../gdb_proc_service.h"
+#include <stdint.h>
+#include <limits.h>
+#include <ctype.h>
+
+struct thread_db
+{
+ /* Structure that identifies the child process for the
+ <proc_service.h> interface. */
+ struct ps_prochandle proc_handle;
-/* Structure that identifies the child process for the
- <proc_service.h> interface. */
-static struct ps_prochandle proc_handle;
+ /* Connection to the libthread_db library. */
+ td_thragent_t *thread_agent;
-/* Connection to the libthread_db library. */
-static td_thragent_t *thread_agent;
+#ifndef USE_LIBTHREAD_DB_DIRECTLY
+ /* Handle of the libthread_db from dlopen. */
+ void *handle;
+#endif
+ /* Addresses of libthread_db functions. */
+ td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta);
+ td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
+ td_event_msg_t *msg);
+ td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
+ td_thr_events_t *event);
+ td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
+ td_event_e event, td_notify_t *ptr);
+ td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid,
+ td_thrhandle_t *th);
+ td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
+ td_thrinfo_t *infop);
+ td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event);
+ td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
+ td_thr_iter_f *callback, void *cbdata_p,
+ td_thr_state_e state, int ti_pri,
+ sigset_t *ti_sigmask_p,
+ unsigned int ti_user_flags);
+ td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
+ psaddr_t map_address,
+ size_t offset, psaddr_t *address);
+ const char ** (*td_symbol_list_p) (void);
+};
+
+static char *libthread_db_search_path;
+
+static int find_one_thread (ptid_t);
static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data);
-static char *
+static const char *
thread_db_err_str (td_err_e err)
{
static char buf[64];
return "only part of register set was written/read";
case TD_NOXREGS:
return "X register set not available for this thread";
+#ifdef HAVE_TD_VERSION
+ case TD_VERSION:
+ return "version mismatch between libthread_db and libpthread";
+#endif
default:
snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
return buf;
}
#endif
-static void
+static int
thread_db_create_event (CORE_ADDR where)
{
td_event_msg_t msg;
td_err_e err;
- struct inferior_linux_data *tdata;
+ struct lwp_info *lwp;
+ struct thread_db *thread_db = current_process ()->private->thread_db;
+
+ if (thread_db->td_ta_event_getmsg_p == NULL)
+ fatal ("unexpected thread_db->td_ta_event_getmsg_p == NULL");
if (debug_threads)
fprintf (stderr, "Thread creation event.\n");
- tdata = inferior_target_data (current_inferior);
-
/* FIXME: This assumes we don't get another event.
In the LinuxThreads implementation, this is safe,
because all events come from the manager thread
(except for its own creation, of course). */
- err = td_ta_event_getmsg (thread_agent, &msg);
+ err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg);
if (err != TD_OK)
fprintf (stderr, "thread getmsg err: %s\n",
thread_db_err_str (err));
+ /* If we do not know about the main thread yet, this would be a good time to
+ find it. We need to do this to pick up the main thread before any newly
+ created threads. */
+ lwp = get_thread_lwp (current_inferior);
+ if (lwp->thread_known == 0)
+ find_one_thread (lwp->head.id);
+
/* msg.event == TD_EVENT_CREATE */
find_new_threads_callback (msg.th_p, NULL);
-}
-#if 0
-static void
-thread_db_death_event (CORE_ADDR where)
-{
- if (debug_threads)
- fprintf (stderr, "Thread death event.\n");
+ return 0;
}
-#endif
static int
thread_db_enable_reporting ()
td_thr_events_t events;
td_notify_t notify;
td_err_e err;
+ struct thread_db *thread_db = current_process ()->private->thread_db;
+
+ if (thread_db->td_ta_set_event_p == NULL
+ || thread_db->td_ta_event_addr_p == NULL
+ || thread_db->td_ta_event_getmsg_p == NULL)
+ /* This libthread_db is missing required support. */
+ return 0;
/* Set the process wide mask saying which events we're interested in. */
td_event_emptyset (&events);
td_event_addset (&events, TD_CREATE);
-#if 0
- /* This is reported to be broken in glibc 2.1.3. A different approach
- will be necessary to support that. */
- td_event_addset (&events, TD_DEATH);
-#endif
-
- err = td_ta_set_event (thread_agent, &events);
+ err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events);
if (err != TD_OK)
{
warning ("Unable to set global thread event mask: %s",
- thread_db_err_str (err));
+ thread_db_err_str (err));
return 0;
}
/* Get address for thread creation breakpoint. */
- err = td_ta_event_addr (thread_agent, TD_CREATE, ¬ify);
+ err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE,
+ ¬ify);
if (err != TD_OK)
{
warning ("Unable to get location for thread creation breakpoint: %s",
set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr,
thread_db_create_event);
-#if 0
- /* Don't concern ourselves with reported thread deaths, only
- with actual thread deaths (via wait). */
-
- /* Get address for thread death breakpoint. */
- err = td_ta_event_addr (thread_agent, TD_DEATH, ¬ify);
- if (err != TD_OK)
- {
- warning ("Unable to get location for thread death breakpoint: %s",
- thread_db_err_str (err));
- return;
- }
- set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr,
- thread_db_death_event);
-#endif
-
return 1;
}
-static void
-maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p)
+static int
+find_one_thread (ptid_t ptid)
{
+ td_thrhandle_t th;
+ td_thrinfo_t ti;
td_err_e err;
struct thread_info *inferior;
- struct process_info *process;
+ struct lwp_info *lwp;
+ struct thread_db *thread_db = current_process ()->private->thread_db;
+ int lwpid = ptid_get_lwp (ptid);
+
+ inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid);
+ lwp = get_thread_lwp (inferior);
+ if (lwp->thread_known)
+ return 1;
+
+ /* Get information about this thread. */
+ err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th);
+ if (err != TD_OK)
+ error ("Cannot get thread handle for LWP %d: %s",
+ lwpid, thread_db_err_str (err));
+
+ err = thread_db->td_thr_get_info_p (&th, &ti);
+ if (err != TD_OK)
+ error ("Cannot get thread info for LWP %d: %s",
+ lwpid, thread_db_err_str (err));
+
+ if (debug_threads)
+ fprintf (stderr, "Found thread %ld (LWP %d)\n",
+ ti.ti_tid, ti.ti_lid);
- /* If we are attaching to our first thread, things are a little
- different. */
- if (all_threads.head == all_threads.tail)
+ if (lwpid != ti.ti_lid)
{
- inferior = (struct thread_info *) all_threads.head;
- process = get_thread_process (inferior);
- if (process->thread_known == 0)
- {
- /* Switch to indexing the threads list by TID. */
- change_inferior_id (&all_threads, ti_p->ti_tid);
- goto found;
- }
+ warning ("PID mismatch! Expected %ld, got %ld",
+ (long) lwpid, (long) ti.ti_lid);
+ return 0;
}
-
- inferior = (struct thread_info *) find_inferior_id (&all_threads,
- ti_p->ti_tid);
- if (inferior != NULL)
- return;
+
+ if (thread_db_use_events)
+ {
+ err = thread_db->td_thr_event_enable_p (&th, 1);
+ if (err != TD_OK)
+ error ("Cannot enable thread event reporting for %d: %s",
+ ti.ti_lid, thread_db_err_str (err));
+ }
+
+ /* If the new thread ID is zero, a final thread ID will be available
+ later. Do not enable thread debugging yet. */
+ if (ti.ti_tid == 0)
+ return 0;
+
+ lwp->thread_known = 1;
+ lwp->th = th;
+
+ return 1;
+}
+
+/* Attach a thread. Return true on success. */
+
+static int
+attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p)
+{
+ struct lwp_info *lwp;
if (debug_threads)
fprintf (stderr, "Attaching to thread %ld (LWP %d)\n",
ti_p->ti_tid, ti_p->ti_lid);
- linux_attach_lwp (ti_p->ti_lid, ti_p->ti_tid);
- inferior = (struct thread_info *) find_inferior_id (&all_threads,
- ti_p->ti_tid);
- if (inferior == NULL)
+ linux_attach_lwp (ti_p->ti_lid);
+ lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid));
+ if (lwp == NULL)
{
warning ("Could not attach to thread %ld (LWP %d)\n",
ti_p->ti_tid, ti_p->ti_lid);
- return;
+ return 0;
}
- process = inferior_target_data (inferior);
+ lwp->thread_known = 1;
+ lwp->th = *th_p;
-found:
- new_thread_notify (ti_p->ti_tid);
+ if (thread_db_use_events)
+ {
+ td_err_e err;
+ struct thread_db *thread_db = current_process ()->private->thread_db;
- process->tid = ti_p->ti_tid;
- process->lwpid = ti_p->ti_lid;
+ err = thread_db->td_thr_event_enable_p (th_p, 1);
+ if (err != TD_OK)
+ error ("Cannot enable thread event reporting for %d: %s",
+ ti_p->ti_lid, thread_db_err_str (err));
+ }
- process->thread_known = 1;
- err = td_thr_event_enable (th_p, 1);
- if (err != TD_OK)
- error ("Cannot enable thread event reporting for %d: %s",
- ti_p->ti_lid, thread_db_err_str (err));
+ return 1;
+}
+
+/* Attach thread if we haven't seen it yet.
+ Increment *COUNTER if we have attached a new thread.
+ Return false on failure. */
+
+static int
+maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p,
+ int *counter)
+{
+ struct lwp_info *lwp;
+
+ lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid));
+ if (lwp != NULL)
+ return 1;
+
+ if (!attach_thread (th_p, ti_p))
+ return 0;
+
+ if (counter != NULL)
+ *counter += 1;
+
+ return 1;
}
static int
{
td_thrinfo_t ti;
td_err_e err;
+ struct thread_db *thread_db = current_process ()->private->thread_db;
- err = td_thr_get_info (th_p, &ti);
+ err = thread_db->td_thr_get_info_p (th_p, &ti);
if (err != TD_OK)
error ("Cannot get thread info: %s", thread_db_err_str (err));
if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
return 0;
- maybe_attach_thread (th_p, &ti);
+ if (!maybe_attach_thread (th_p, &ti, (int *) data))
+ {
+ /* Terminate iteration early: we might be looking at stale data in
+ the inferior. The thread_db_find_new_threads will retry. */
+ return 1;
+ }
return 0;
}
thread_db_find_new_threads (void)
{
td_err_e err;
+ ptid_t ptid = ((struct inferior_list_entry *) current_inferior)->id;
+ struct thread_db *thread_db = current_process ()->private->thread_db;
+ int loop, iteration;
+
+ /* This function is only called when we first initialize thread_db.
+ First locate the initial thread. If it is not ready for
+ debugging yet, then stop. */
+ if (find_one_thread (ptid) == 0)
+ return;
- /* Iterate over all user-space threads to discover new threads. */
- err = td_ta_thr_iter (thread_agent, find_new_threads_callback, NULL,
- TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
- TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
+ /* Require 4 successive iterations which do not find any new threads.
+ The 4 is a heuristic: there is an inherent race here, and I have
+ seen that 2 iterations in a row are not always sufficient to
+ "capture" all threads. */
+ for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration)
+ {
+ int new_thread_count = 0;
+
+ /* Iterate over all user-space threads to discover new threads. */
+ err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent,
+ find_new_threads_callback,
+ &new_thread_count,
+ TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
+ TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
+ if (debug_threads)
+ fprintf (stderr, "Found %d threads in iteration %d.\n",
+ new_thread_count, iteration);
+
+ if (new_thread_count != 0)
+ {
+ /* Found new threads. Restart iteration from beginning. */
+ loop = -1;
+ }
+ }
if (err != TD_OK)
error ("Cannot find new threads: %s", thread_db_err_str (err));
}
+/* Cache all future symbols that thread_db might request. We can not
+ request symbols at arbitrary states in the remote protocol, only
+ when the client tells us that new symbols are available. So when
+ we load the thread library, make sure to check the entire list. */
+
+static void
+thread_db_look_up_symbols (void)
+{
+ struct thread_db *thread_db = current_process ()->private->thread_db;
+ const char **sym_list;
+ CORE_ADDR unused;
+
+ for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++)
+ look_up_one_symbol (*sym_list, &unused);
+}
+
int
-thread_db_init ()
+thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
+ CORE_ADDR load_module, CORE_ADDR *address)
{
- int err;
+ psaddr_t addr;
+ td_err_e err;
+ struct lwp_info *lwp;
+ struct thread_info *saved_inferior;
+ struct process_info *proc;
+ struct thread_db *thread_db;
+
+ proc = get_thread_process (thread);
+ thread_db = proc->private->thread_db;
+
+ /* If the thread layer is not (yet) initialized, fail. */
+ if (!proc->all_symbols_looked_up)
+ return TD_ERR;
+
+ if (thread_db->td_thr_tls_get_addr_p == NULL)
+ return -1;
+
+ lwp = get_thread_lwp (thread);
+ if (!lwp->thread_known)
+ find_one_thread (lwp->head.id);
+ if (!lwp->thread_known)
+ return TD_NOTHR;
+
+ saved_inferior = current_inferior;
+ current_inferior = thread;
+ /* Note the cast through uintptr_t: this interface only works if
+ a target address fits in a psaddr_t, which is a host pointer.
+ So a 32-bit debugger can not access 64-bit TLS through this. */
+ err = thread_db->td_thr_tls_get_addr_p (&lwp->th,
+ (psaddr_t) (uintptr_t) load_module,
+ offset, &addr);
+ current_inferior = saved_inferior;
+ if (err == TD_OK)
+ {
+ *address = (CORE_ADDR) (uintptr_t) addr;
+ return 0;
+ }
+ else
+ return err;
+}
- proc_handle.pid = ((struct inferior_list_entry *)current_inferior)->id;
+#ifdef USE_LIBTHREAD_DB_DIRECTLY
- err = td_ta_new (&proc_handle, &thread_agent);
- switch (err)
+static int
+thread_db_load_search (void)
+{
+ td_err_e err;
+ struct thread_db tdb;
+ struct process_info *proc = current_process ();
+
+ if (proc->private->thread_db != NULL)
+ fatal ("unexpected: proc->private->thread_db != NULL");
+
+ tdb.td_ta_new_p = &td_ta_new;
+
+ /* Attempt to open a connection to the thread library. */
+ err = tdb.td_ta_new_p (&tdb.proc_handle, &tdb.thread_agent);
+ if (err != TD_OK)
{
- case TD_NOLIBTHREAD:
- /* No thread library was detected. */
+ if (debug_threads)
+ fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err));
return 0;
+ }
- case TD_OK:
- /* The thread library was detected. */
+ tdb.td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr;
+ tdb.td_thr_get_info_p = &td_thr_get_info;
+ tdb.td_ta_thr_iter_p = &td_ta_thr_iter;
+ tdb.td_symbol_list_p = &td_symbol_list;
+
+ /* This is required only when thread_db_use_events is on. */
+ tdb.td_thr_event_enable_p = &td_thr_event_enable;
+
+ /* These are not essential. */
+ tdb.td_ta_event_addr_p = &td_ta_event_addr;
+ tdb.td_ta_set_event_p = &td_ta_set_event;
+ tdb.td_ta_event_getmsg_p = &td_ta_event_getmsg;
+ tdb.td_thr_tls_get_addr_p = &td_thr_tls_get_addr;
- if (thread_db_enable_reporting () == 0)
- return 0;
+ proc->private->thread_db = xmalloc (sizeof (tdb));
+ memcpy (proc->private->thread_db, &tdb, sizeof (tdb));
+
+ return 1;
+}
+
+#else
+
+static int
+try_thread_db_load_1 (void *handle)
+{
+ td_err_e err;
+ struct thread_db tdb;
+ struct process_info *proc = current_process ();
+
+ if (proc->private->thread_db != NULL)
+ fatal ("unexpected: proc->private->thread_db != NULL");
+
+ tdb.handle = handle;
+
+ /* Initialize pointers to the dynamic library functions we will use.
+ Essential functions first. */
+
+#define CHK(required, a) \
+ do \
+ { \
+ if ((a) == NULL) \
+ { \
+ if (debug_threads) \
+ fprintf (stderr, "dlsym: %s\n", dlerror ()); \
+ if (required) \
+ return 0; \
+ } \
+ } \
+ while (0)
+
+ CHK (1, tdb.td_ta_new_p = dlsym (handle, "td_ta_new"));
+
+ /* Attempt to open a connection to the thread library. */
+ err = tdb.td_ta_new_p (&tdb.proc_handle, &tdb.thread_agent);
+ if (err != TD_OK)
+ {
+ if (debug_threads)
+ fprintf (stderr, "td_ta_new(): %s\n", thread_db_err_str (err));
+ return 0;
+ }
+
+ CHK (1, tdb.td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr"));
+ CHK (1, tdb.td_thr_get_info_p = dlsym (handle, "td_thr_get_info"));
+ CHK (1, tdb.td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter"));
+ CHK (1, tdb.td_symbol_list_p = dlsym (handle, "td_symbol_list"));
+
+ /* This is required only when thread_db_use_events is on. */
+ CHK (thread_db_use_events,
+ tdb.td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable"));
+
+ /* These are not essential. */
+ CHK (0, tdb.td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr"));
+ CHK (0, tdb.td_ta_set_event_p = dlsym (handle, "td_ta_set_event"));
+ CHK (0, tdb.td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg"));
+ CHK (0, tdb.td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr"));
+
+#undef CHK
+
+ proc->private->thread_db = xmalloc (sizeof (tdb));
+ memcpy (proc->private->thread_db, &tdb, sizeof (tdb));
+
+ return 1;
+}
+
+#ifdef HAVE_DLADDR
+
+/* Lookup a library in which given symbol resides.
+ Note: this is looking in the GDBSERVER process, not in the inferior.
+ Returns library name, or NULL. */
+
+static const char *
+dladdr_to_soname (const void *addr)
+{
+ Dl_info info;
+
+ if (dladdr (addr, &info) != 0)
+ return info.dli_fname;
+ return NULL;
+}
+
+#endif
+
+static int
+try_thread_db_load (const char *library)
+{
+ void *handle;
+
+ if (debug_threads)
+ fprintf (stderr, "Trying host libthread_db library: %s.\n",
+ library);
+ handle = dlopen (library, RTLD_NOW);
+ if (handle == NULL)
+ {
+ if (debug_threads)
+ fprintf (stderr, "dlopen failed: %s.\n", dlerror ());
+ return 0;
+ }
+
+#ifdef HAVE_DLADDR
+ if (debug_threads && strchr (library, '/') == NULL)
+ {
+ void *td_init;
+
+ td_init = dlsym (handle, "td_init");
+ if (td_init != NULL)
+ {
+ const char *const libpath = dladdr_to_soname (td_init);
+
+ if (libpath != NULL)
+ fprintf (stderr, "Host %s resolved to: %s.\n",
+ library, libpath);
+ }
+ }
+#endif
+
+ if (try_thread_db_load_1 (handle))
+ return 1;
+
+ /* This library "refused" to work on current inferior. */
+ dlclose (handle);
+ return 0;
+}
+
+static int
+thread_db_load_search (void)
+{
+ char path[PATH_MAX];
+ const char *search_path;
+ int rc = 0;
+
+ if (libthread_db_search_path == NULL)
+ libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH);
+
+ search_path = libthread_db_search_path;
+ while (*search_path)
+ {
+ const char *end = strchr (search_path, ':');
+ if (end)
+ {
+ size_t len = end - search_path;
+ if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path))
+ {
+ char *cp = xmalloc (len + 1);
+ memcpy (cp, search_path, len);
+ cp[len] = '\0';
+ warning ("libthread_db_search_path component too long, "
+ "ignored: %s.", cp);
+ free (cp);
+ search_path += len + 1;
+ continue;
+ }
+ memcpy (path, search_path, len);
+ path[len] = '\0';
+ search_path += len + 1;
+ }
+ else
+ {
+ size_t len = strlen (search_path);
+
+ if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path))
+ {
+ warning ("libthread_db_search_path component too long,"
+ " ignored: %s.", search_path);
+ break;
+ }
+ memcpy (path, search_path, len + 1);
+ search_path += len;
+ }
+ strcat (path, "/");
+ strcat (path, LIBTHREAD_DB_SO);
+ if (debug_threads)
+ fprintf (stderr, "thread_db_load_search trying %s\n", path);
+ if (try_thread_db_load (path))
+ {
+ rc = 1;
+ break;
+ }
+ }
+ if (rc == 0)
+ rc = try_thread_db_load (LIBTHREAD_DB_SO);
+
+ if (debug_threads)
+ fprintf (stderr, "thread_db_load_search returning %d\n", rc);
+ return rc;
+}
+
+#endif /* USE_LIBTHREAD_DB_DIRECTLY */
+
+int
+thread_db_init (int use_events)
+{
+ struct process_info *proc = current_process ();
+
+ /* FIXME drow/2004-10-16: This is the "overall process ID", which
+ GNU/Linux calls tgid, "thread group ID". When we support
+ attaching to threads, the original thread may not be the correct
+ thread. We would have to get the process ID from /proc for NPTL.
+ For LinuxThreads we could do something similar: follow the chain
+ of parent processes until we find the highest one we're attached
+ to, and use its tgid.
+
+ This isn't the only place in gdbserver that assumes that the first
+ process in the list is the thread group leader. */
+
+ thread_db_use_events = use_events;
+
+ if (thread_db_load_search ())
+ {
+ if (use_events && thread_db_enable_reporting () == 0)
+ {
+ /* Keep trying; maybe event reporting will work later. */
+ thread_db_mourn (proc);
+ return 0;
+ }
thread_db_find_new_threads ();
+ thread_db_look_up_symbols ();
+ proc->all_symbols_looked_up = 1;
return 1;
+ }
- default:
- warning ("error initializing thread_db library.");
+ return 0;
+}
+
+static int
+any_thread_of (struct inferior_list_entry *entry, void *args)
+{
+ int *pid_p = args;
+
+ if (ptid_get_pid (entry->id) == *pid_p)
+ return 1;
+
+ return 0;
+}
+
+/* Disconnect from libthread_db and free resources. */
+
+static void
+disable_thread_event_reporting (struct process_info *proc)
+{
+ struct thread_db *thread_db = proc->private->thread_db;
+ if (thread_db)
+ {
+ td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta,
+ td_thr_events_t *event);
+
+#ifndef USE_LIBTHREAD_DB_DIRECTLY
+ td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event");
+#else
+ td_ta_clear_event_p = &td_ta_clear_event;
+#endif
+
+ if (td_ta_clear_event_p != NULL)
+ {
+ struct thread_info *saved_inferior;
+ td_thr_events_t events;
+ int pid;
+
+ pid = pid_of (proc);
+ saved_inferior = current_inferior;
+ current_inferior =
+ (struct thread_info *) find_inferior (&all_threads,
+ any_thread_of, &pid);
+
+ /* Set the process wide mask saying we aren't interested
+ in any events anymore. */
+ td_event_fillset (&events);
+ (*td_ta_clear_event_p) (thread_db->thread_agent, &events);
+
+ current_inferior = saved_inferior;
+ }
+ }
+}
+
+void
+thread_db_detach (struct process_info *proc)
+{
+ disable_thread_event_reporting (proc);
+}
+
+/* Disconnect from libthread_db and free resources. */
+
+void
+thread_db_mourn (struct process_info *proc)
+{
+ struct thread_db *thread_db = proc->private->thread_db;
+ if (thread_db)
+ {
+ td_err_e (*td_ta_delete_p) (td_thragent_t *);
+
+#ifndef USE_LIBTHREAD_DB_DIRECTLY
+ td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete");
+#else
+ td_ta_delete_p = &td_ta_delete;
+#endif
+
+ if (td_ta_delete_p != NULL)
+ (*td_ta_delete_p) (thread_db->thread_agent);
+
+#ifndef USE_LIBTHREAD_DB_DIRECTLY
+ dlclose (thread_db->handle);
+#endif /* USE_LIBTHREAD_DB_DIRECTLY */
+
+ free (thread_db);
+ proc->private->thread_db = NULL;
+ }
+}
+
+/* Handle "set libthread-db-search-path" monitor command and return 1.
+ For any other command, return 0. */
+
+int
+thread_db_handle_monitor_command (char *mon)
+{
+ if (strncmp (mon, "set libthread-db-search-path ", 29) == 0)
+ {
+ const char *cp = mon + 29;
+
+ if (libthread_db_search_path != NULL)
+ free (libthread_db_search_path);
+
+ /* Skip leading space (if any). */
+ while (isspace (*cp))
+ ++cp;
+
+ libthread_db_search_path = xstrdup (cp);
+
+ monitor_output ("libthread-db-search-path set to `");
+ monitor_output (libthread_db_search_path);
+ monitor_output ("'\n");
+ return 1;
}
+ /* Tell server.c to perform default processing. */
return 0;
}