[v2,5/6] Add support for LWP-based threads on FreeBSD.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 0accac9..fdf35b0 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,4 +1,42 @@ 
 2016-01-10  John Baldwin  <jhb@FreeBSD.org>
+
+	* configure.ac: Check for support for LWP names on FreeBSD.
+	* fbsd-nat.c [PT_LWPINFO] New variable debug_fbsd_lwp.
+	[TDP_RFPPWAIT || HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME]
+	(fbsd_fetch_kinfo_proc): Move function earlier.
+	[PT_LWPINFO] (fbsd_thread_alive): New function.
+	[PT_LWPINFO] (fbsd_pid_to_str): New function.
+	[HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME] (fbsd_thread_name): New function.
+	[PT_LWP_EVENTS] (fbsd_enable_lwp_events): New function.
+	[PT_LWPINFO] (fbsd_add_threads): New function.
+	[PT_LWPINFO] (fbsd_update_thread_list): New function.
+	[PT_LWPINFO] New variable super_resume.
+	[PT_LWPINFO] (resume_one_thread_cb): New function.
+	[PT_LWPINFO] (resume_all_threads_cb): New function.
+	[PT_LWPINFO] (fbsd_resume): New function.
+	(fbsd_remember_child): Save full ptid instead of plain pid.
+	(fbsd_is_child_pending): Return ptid of saved child process.
+	(fbsd_wait): Include lwp in returned ptid and switch to LWP ptid on
+	first stop.
+	[PT_LWP_EVENTS] Handle LWP events.
+	[TDP_RFPPWAIT] Include LWP in child ptid.
+	(fbsd_post_startup_inferior) [PT_LWP_EVENTS]: Enable LWP events.
+	(fbsd_post_attach) [PT_LWP_EVENTS]: Enable LWP events.
+	Add threads for existing processes.
+	(fbsd_nat_add_target) [PT_LWPINFO]: Set "to_thread_alive" to
+	"fbsd_thread_alive".
+	Set "to_pid_to_str" to "fbsd_pid_to_str".
+	[HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME]: Set "to_thread_name" to
+	"fbsd_thread_name".
+	[PT_LWPINFO]: Set "to_update_thread_list" to "fbsd_update_thread_list".
+	Set "to_has_thread_control" to "tc_schedlock".
+	Set "to_resume" to "fbsd_resume".
+	(_initialize_fbsd_nat): New function.
+	* configure: Regenerate.
+	* config.in: Regenerate.
+
+2016-01-10  John Baldwin  <jhb@FreeBSD.org>
+
 	* amd64bsd-nat.c (get_ptrace_pid): New function.
 	(amd64bsd_fetch_inferior_registers): Use new function.
 	(amd64bsd_store_inferior_registers): Use new function.
diff --git a/gdb/config.in b/gdb/config.in
index 6196fa0..dc9da0a 100644
--- a/gdb/config.in
+++ b/gdb/config.in
@@ -450,6 +450,9 @@ 
 /* Define to 1 if your system has struct lwp. */
 #undef HAVE_STRUCT_LWP
 
+/* Define to 1 if `struct ptrace_lwpinfo' is a member of `pl_tdname'. */
+#undef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
+
 /* Define to 1 if your system has struct reg in <machine/reg.h>. */
 #undef HAVE_STRUCT_REG
 
diff --git a/gdb/configure b/gdb/configure
index 15383d6..2dc1c9d 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -12964,6 +12964,22 @@  $as_echo "#define HAVE_PT_GETXMMREGS 1" >>confdefs.h
 
 fi
 
+# See if <sys/ptrace.h> supports LWP names on FreeBSD
+# Older FreeBSD versions don't have the pl_tdname member of
+# `struct ptrace_lwpinfo'.
+ac_fn_c_check_member "$LINENO" "struct ptrace_lwpinfo" "pl_tdname" "ac_cv_member_struct_ptrace_lwpinfo_pl_tdname" "#include <sys/ptrace.h>
+"
+if test "x$ac_cv_member_struct_ptrace_lwpinfo_pl_tdname" = x""yes; then :
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME 1
+_ACEOF
+
+
+fi
+
+
+
 # Detect which type of /proc is in use, such as for Solaris.
 
 if test "${target}" = "${host}"; then
diff --git a/gdb/configure.ac b/gdb/configure.ac
index d102640..ad62310 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -1510,6 +1510,13 @@  if test $gdb_cv_have_pt_getxmmregs = yes; then
   [Define if sys/ptrace.h defines the PT_GETXMMREGS request.])
 fi
 
+# See if <sys/ptrace.h> supports LWP names on FreeBSD
+# Older FreeBSD versions don't have the pl_tdname member of
+# `struct ptrace_lwpinfo'.
+AC_CHECK_MEMBERS([struct ptrace_lwpinfo.pl_tdname], [], [],
+                 [#include <sys/ptrace.h>])
+
+
 # Detect which type of /proc is in use, such as for Solaris.
 
 if test "${target}" = "${host}"; then
diff --git a/gdb/fbsd-nat.c b/gdb/fbsd-nat.c
index 702e51d..ee53f82 100644
--- a/gdb/fbsd-nat.c
+++ b/gdb/fbsd-nat.c
@@ -22,6 +22,7 @@ 
 #include "inferior.h"
 #include "regcache.h"
 #include "regset.h"
+#include "gdbcmd.h"
 #include "gdbthread.h"
 #include "gdb_wait.h"
 #include <sys/types.h>
@@ -204,11 +205,276 @@  fbsd_find_memory_regions (struct target_ops *self,
 #endif
 
 #ifdef PT_LWPINFO
+static int debug_fbsd_lwp;
+
 static ptid_t (*super_wait) (struct target_ops *,
 			     ptid_t,
 			     struct target_waitstatus *,
 			     int);
 
+#if defined(TDP_RFPPWAIT) || defined(HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME)
+/* Fetch the external variant of the kernel's internal process
+   structure for the process PID into KP.  */
+
+static void
+fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp)
+{
+  size_t len;
+  int mib[4];
+
+  len = sizeof *kp;
+  mib[0] = CTL_KERN;
+  mib[1] = KERN_PROC;
+  mib[2] = KERN_PROC_PID;
+  mib[3] = pid;
+  if (sysctl (mib, 4, kp, &len, NULL, 0) == -1)
+    perror_with_name (("sysctl"));
+}
+#endif
+
+/*
+  FreeBSD's first thread support was via a "reentrant" version of libc
+  (libc_r) that first shipped in 2.2.7.  This library multiplexed all
+  of the threads in a process onto a single kernel thread.  This
+  library is supported via the bsd-uthread target.
+
+  FreeBSD 5.1 introduced two new threading libraries that made use of
+  multiple kernel threads.  The first (libkse) scheduled M user
+  threads onto N (<= M) kernel threads (LWPs).  The second (libthr)
+  bound each user thread to a dedicated kernel thread.  libkse shipped
+  as the default threading library (libpthread).
+
+  FreeBSD 5.3 added a libthread_db to abstract the interface across
+  the various thread libraries (libc_r, libkse, and libthr).
+
+  FreeBSD 7.0 switched the default threading library from from libkse
+  to libpthread and removed libc_r.
+
+  FreeBSD 8.0 removed libkse and the in-kernel support for it.  The
+  only threading library supported by 8.0 and later is libthr which
+  ties each user thread directly to an LWP.  To simplify the
+  implementation, this target only supports LWP-backed threads using
+  ptrace directly rather than libthread_db.
+
+  FreeBSD 11.0 introduced LWP event reporting via PT_LWP_EVENTS.
+*/
+
+/* Return true if PTID is still active in the inferior.  */
+
+static int
+fbsd_thread_alive (struct target_ops *ops, ptid_t ptid)
+{
+  if (ptid_lwp_p (ptid))
+    {
+      struct ptrace_lwpinfo pl;
+
+      if (ptrace (PT_LWPINFO, ptid_get_lwp (ptid), (caddr_t)&pl, sizeof pl)
+	  == -1)
+	return 0;
+#ifdef PL_FLAG_EXITED
+      if (pl.pl_flags & PL_FLAG_EXITED)
+	return 0;
+#endif
+    }
+
+  return 1;
+}
+
+/* Convert PTID to a string.  Returns the string in a static
+   buffer.  */
+
+static char *
+fbsd_pid_to_str (struct target_ops *ops, ptid_t ptid)
+{
+  lwpid_t lwp;
+
+  lwp = ptid_get_lwp (ptid);
+  if (lwp != 0)
+    {
+      static char buf[64];
+      int pid = ptid_get_pid (ptid);
+
+      xsnprintf (buf, sizeof buf, "process %d, LWP %d", pid, lwp);
+      return buf;
+    }
+
+  return normal_pid_to_str (ptid);
+}
+
+#ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
+/* Return the name assigned to a thread by an application.  Returns
+   the string in a static buffer.  */
+
+static const char *
+fbsd_thread_name (struct target_ops *self, struct thread_info *thr)
+{
+  struct ptrace_lwpinfo pl;
+  struct kinfo_proc kp;
+  int pid = ptid_get_pid (thr->ptid);
+  long lwp = ptid_get_lwp (thr->ptid);
+  static char buf[64];
+
+  /* Note that ptrace_lwpinfo returns the process command in pl_tdname
+     if a name has not been set explicitly.  Return a NULL name in
+     that case.  */
+  fbsd_fetch_kinfo_proc (pid, &kp);
+  if (ptrace (PT_LWPINFO, lwp, (caddr_t)&pl, sizeof pl) == -1)
+    perror_with_name (("ptrace"));
+  if (strcmp (kp.ki_comm, pl.pl_tdname) == 0)
+    return NULL;
+  xsnprintf (buf, sizeof buf, "%s", pl.pl_tdname);
+  return buf;
+}
+#endif
+
+#ifdef PT_LWP_EVENTS
+/* Enable LWP events for a specific process.
+
+   To catch LWP events, PT_LWP_EVENTS is set on every traced process.
+   This enables stops on the birth for new LWPs (excluding the "main" LWP)
+   and the death of LWPs (excluding the last LWP in a process).  Note
+   that unlike fork events, the LWP that creates a new LWP does not
+   report an event.  */
+
+static void
+fbsd_enable_lwp_events (pid_t pid)
+{
+  if (ptrace (PT_LWP_EVENTS, pid, (PTRACE_TYPE_ARG3)0, 1) == -1)
+    perror_with_name (("ptrace"));
+}
+#endif
+
+/* Add threads for any new LWPs in a process.
+
+   When LWP events are used, this function is only used to detect existing
+   threads when attaching to a process.  On older systems, this function is
+   called to discover new threads each time the thread list is updated.  */
+
+static void
+fbsd_add_threads (pid_t pid)
+{
+  struct cleanup *cleanup;
+  lwpid_t *lwps;
+  int i, nlwps;
+
+  gdb_assert (!in_thread_list (pid_to_ptid (pid)));
+  nlwps = ptrace (PT_GETNUMLWPS, pid, NULL, 0);
+  if (nlwps == -1)
+    perror_with_name (("ptrace"));
+
+  lwps = XCNEWVEC (lwpid_t, nlwps);
+  cleanup = make_cleanup (xfree, lwps);
+
+  nlwps = ptrace (PT_GETLWPLIST, pid, (caddr_t)lwps, nlwps);
+  if (nlwps == -1)
+    perror_with_name (("ptrace"));
+
+  for (i = 0; i < nlwps; i++)
+    {
+      ptid_t ptid = ptid_build (pid, lwps[i], 0);
+
+      if (!in_thread_list (ptid))
+	{
+#ifdef PT_LWP_EVENTS
+	  struct ptrace_lwpinfo pl;
+
+	  /* Don't add exited threads.  Note that this is only called
+	     when attaching to a multi-threaded process.  */
+	  if (ptrace (PT_LWPINFO, lwps[i], (caddr_t)&pl, sizeof pl) == -1)
+	    perror_with_name (("ptrace"));
+	  if (pl.pl_flags & PL_FLAG_EXITED)
+	    continue;
+#endif
+	  if (debug_fbsd_lwp)
+	    fprintf_unfiltered (gdb_stdlog,
+				"FLWP: adding thread for LWP %u\n",
+				lwps[i]);
+	  add_thread (ptid);
+	}
+    }
+  do_cleanups (cleanup);
+}
+
+/* Implement the "to_update_thread_list" target_ops method.  */
+
+static void
+fbsd_update_thread_list (struct target_ops *ops)
+{
+#ifdef PT_LWP_EVENTS
+  /* With support for thread events, threads are added/deleted from the
+     list as events are reported, so just try deleting exited threads.  */
+  delete_exited_threads ();
+#else
+  prune_threads();
+
+  fbsd_add_threads (ptid_get_pid (inferior_ptid));
+#endif
+}
+
+static void (*super_resume) (struct target_ops *,
+			     ptid_t,
+			     int,
+			     enum gdb_signal);
+
+static int
+resume_one_thread_cb(struct thread_info *tp, void *data)
+{
+  ptid_t *ptid = data;
+  int request;
+
+  if (ptid_get_pid (tp->ptid) != ptid_get_pid (*ptid))
+    return 0;
+
+  if (ptid_get_lwp (tp->ptid) == ptid_get_lwp (*ptid))
+    request = PT_RESUME;
+  else
+    request = PT_SUSPEND;
+
+  if (ptrace (request, ptid_get_lwp (tp->ptid), (caddr_t)0, 0) == -1)
+    perror_with_name (("ptrace"));
+  return 0;
+}
+
+static int
+resume_all_threads_cb(struct thread_info *tp, void *data)
+{
+  ptid_t *filter = data;
+
+  if (!ptid_match (tp->ptid, *filter))
+    return 0;
+
+  if (ptrace (PT_RESUME, ptid_get_lwp (tp->ptid), (caddr_t)0, 0) == -1)
+    perror_with_name (("ptrace"));
+  return 0;
+}
+
+/* Implement the "to_resume" target_ops method.  */
+
+static void
+fbsd_resume (struct target_ops *ops,
+	     ptid_t ptid, int step, enum gdb_signal signo)
+{
+
+  if (debug_fbsd_lwp)
+    fprintf_unfiltered (gdb_stdlog,
+			"FLWP: fbsd_resume for ptid (%d, %ld, %ld)\n",
+			ptid_get_pid (ptid), ptid_get_lwp (ptid),
+			ptid_get_tid (ptid));
+  if (ptid_lwp_p (ptid))
+    {
+      /* If ptid is a specific LWP, suspend all other LWPs in the process.  */
+      iterate_over_threads (resume_one_thread_cb, &ptid);
+    }
+  else
+    {
+      /* If ptid is a wildcard, resume all matching threads (they won't run
+	 until the process is continued however).  */
+      iterate_over_threads (resume_all_threads_cb, &ptid);
+      ptid = inferior_ptid;
+    }
+  super_resume (ops, ptid, step, signo);
+}
+
 #ifdef TDP_RFPPWAIT
 /*
   To catch fork events, PT_FOLLOW_FORK is set on every traced process
@@ -246,7 +512,7 @@  static ptid_t (*super_wait) (struct target_ops *,
 struct fbsd_fork_child_info
 {
   struct fbsd_fork_child_info *next;
-  pid_t child;			/* Pid of new child.  */
+  ptid_t child;			/* Pid of new child.  */
 };
 
 static struct fbsd_fork_child_info *fbsd_pending_children;
@@ -255,7 +521,7 @@  static struct fbsd_fork_child_info *fbsd_pending_children;
    corresponding fork event in the parent.  */
 
 static void
-fbsd_remember_child (pid_t pid)
+fbsd_remember_child (ptid_t pid)
 {
   struct fbsd_fork_child_info *info = XCNEW (struct fbsd_fork_child_info);
 
@@ -265,45 +531,29 @@  fbsd_remember_child (pid_t pid)
 }
 
 /* Check for a previously-recorded new child process event for PID.
-   If one is found, remove it from the list.  */
+   If one is found, remove it from the list and return the PTID.  */
 
-static int
+static ptid_t
 fbsd_is_child_pending (pid_t pid)
 {
   struct fbsd_fork_child_info *info, *prev;
+  ptid_t ptid;
 
   prev = NULL;
   for (info = fbsd_pending_children; info; prev = info, info = info->next)
     {
-      if (info->child == pid)
+      if (ptid_get_pid (info->child) == pid)
 	{
 	  if (prev == NULL)
 	    fbsd_pending_children = info->next;
 	  else
 	    prev->next = info->next;
+	  ptid = info->child;
 	  xfree (info);
-	  return 1;
+	  return ptid;
 	}
     }
-  return 0;
-}
-
-/* Fetch the external variant of the kernel's internal process
-   structure for the process PID into KP.  */
-
-static void
-fbsd_fetch_kinfo_proc (pid_t pid, struct kinfo_proc *kp)
-{
-  size_t len;
-  int mib[4];
-
-  len = sizeof *kp;
-  mib[0] = CTL_KERN;
-  mib[1] = KERN_PROC;
-  mib[2] = KERN_PROC_PID;
-  mib[3] = pid;
-  if (sysctl (mib, 4, kp, &len, NULL, 0) == -1)
-    perror_with_name (("sysctl"));
+  return null_ptid;
 }
 #endif
 
@@ -331,18 +581,80 @@  fbsd_wait (struct target_ops *ops,
 	  if (ptrace (PT_LWPINFO, pid, (caddr_t)&pl, sizeof pl) == -1)
 	    perror_with_name (("ptrace"));
 
+	  wptid = ptid_build (pid, pl.pl_lwpid, 0);
+
+#ifdef PT_LWP_EVENTS
+	  if (pl.pl_flags & PL_FLAG_EXITED)
+	    {
+	      /* If GDB attaches to a multi-threaded process, exiting
+		 threads might be skipped during fbsd_post_attach that
+		 have not yet reported their PL_FLAG_EXITED event.
+		 Ignore EXITED events for an unknown LWP.  */
+	      if (in_thread_list (wptid))
+		{
+		  if (debug_fbsd_lwp)
+		    fprintf_unfiltered (gdb_stdlog,
+					"FLWP: deleting thread for LWP %u\n",
+					pl.pl_lwpid);
+		  if (print_thread_events)
+		    printf_unfiltered (_("[%s exited]\n"), target_pid_to_str
+				       (wptid));
+		  delete_thread (wptid);
+		}
+	      if (ptrace (PT_CONTINUE, pid, (PTRACE_TYPE_ARG3)1, 0) == -1)
+		perror_with_name (("ptrace"));
+	      continue;
+	    }
+#endif
+
+	  /* Switch to an LWP PTID on the first stop in a new process.
+	     This is done after handling PL_FLAG_EXITED to avoid
+	     switching to an exited LWP.  It is done before checking
+	     PL_FLAG_BORN in case the first stop reported after
+	     attaching to an existing process is a PL_FLAG_BORN
+	     event.  */
+	  if (in_thread_list (pid_to_ptid (pid)))
+	    {
+	      if (debug_fbsd_lwp)
+		fprintf_unfiltered (gdb_stdlog,
+				    "FLWP: using LWP %u for first thread\n",
+				    pl.pl_lwpid);
+	      thread_change_ptid (pid_to_ptid (pid), wptid);
+	    }
+
+#ifdef PT_LWP_EVENTS
+	  if (pl.pl_flags & PL_FLAG_BORN)
+	    {
+	      /* If GDB attaches to a multi-threaded process, newborn
+		 threads might be added by fbsd_add_threads that have
+		 not yet reported their PL_FLAG_BORN event.  Ignore
+		 BORN events for an already-known LWP.  */
+	      if (!in_thread_list (wptid))
+		{
+		  if (debug_fbsd_lwp)
+		    fprintf_unfiltered (gdb_stdlog,
+					"FLWP: adding thread for LWP %u\n",
+					pl.pl_lwpid);
+		  add_thread (wptid);
+		}
+	      ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+	      return wptid;
+	    }
+#endif
+
 #ifdef TDP_RFPPWAIT
 	  if (pl.pl_flags & PL_FLAG_FORKED)
 	    {
 	      struct kinfo_proc kp;
+	      ptid_t child_ptid;
 	      pid_t child;
 
 	      child = pl.pl_child_pid;
 	      ourstatus->kind = TARGET_WAITKIND_FORKED;
-	      ourstatus->value.related_pid = pid_to_ptid (child);
 
 	      /* Make sure the other end of the fork is stopped too.  */
-	      if (!fbsd_is_child_pending (child))
+	      child_ptid = fbsd_is_child_pending (child);
+	      if (ptid_equal (child_ptid, null_ptid))
 		{
 		  pid = waitpid (child, &status, 0);
 		  if (pid == -1)
@@ -354,6 +666,7 @@  fbsd_wait (struct target_ops *ops,
 		    perror_with_name (("ptrace"));
 
 		  gdb_assert (pl.pl_flags & PL_FLAG_CHILD);
+		  child_ptid = ptid_build(child, pl.pl_lwpid, 0);
 		}
 
 	      /* For vfork, the child process will have the P_PPWAIT
@@ -361,6 +674,7 @@  fbsd_wait (struct target_ops *ops,
 	      fbsd_fetch_kinfo_proc (child, &kp);
 	      if (kp.ki_flag & P_PPWAIT)
 		ourstatus->kind = TARGET_WAITKIND_VFORKED;
+	      ourstatus->value.related_pid = child_ptid;
 
 	      return wptid;
 	    }
@@ -370,7 +684,7 @@  fbsd_wait (struct target_ops *ops,
 	      /* Remember that this child forked, but do not report it
 		 until the parent reports its corresponding fork
 		 event.  */
-	      fbsd_remember_child (ptid_get_pid (wptid));
+	      fbsd_remember_child (wptid);
 	      continue;
 	    }
 #endif
@@ -449,13 +763,19 @@  fbsd_enable_follow_fork (pid_t pid)
   if (ptrace (PT_FOLLOW_FORK, pid, (PTRACE_TYPE_ARG3)0, 1) == -1)
     perror_with_name (("ptrace"));
 }
+#endif
 
 /* Implement the "to_post_startup_inferior" target_ops method.  */
 
 static void
 fbsd_post_startup_inferior (struct target_ops *self, ptid_t pid)
 {
+#ifdef TDP_RFPPWAIT
   fbsd_enable_follow_fork (ptid_get_pid (pid));
+#endif
+#ifdef PT_LWP_EVENTS
+  fbsd_enable_lwp_events (ptid_get_pid (pid));
+#endif
 }
 
 /* Implement the "to_post_attach" target_ops method.  */
@@ -463,9 +783,14 @@  fbsd_post_startup_inferior (struct target_ops *self, ptid_t pid)
 static void
 fbsd_post_attach (struct target_ops *self, int pid)
 {
+#ifdef TDP_RFPPWAIT
   fbsd_enable_follow_fork (pid);
-}
 #endif
+#ifdef PT_LWP_EVENTS
+  fbsd_enable_lwp_events (pid);
+#endif
+  fbsd_add_threads (pid);
+}
 
 #ifdef PL_FLAG_EXEC
 /* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes
@@ -491,16 +816,25 @@  fbsd_nat_add_target (struct target_ops *t)
   t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
   t->to_find_memory_regions = fbsd_find_memory_regions;
 #ifdef PT_LWPINFO
+  t->to_thread_alive = fbsd_thread_alive;
+  t->to_pid_to_str = fbsd_pid_to_str;
+#ifdef HAVE_STRUCT_PTRACE_LWPINFO_PL_TDNAME
+  t->to_thread_name = fbsd_thread_name;
+#endif
+  t->to_update_thread_list = fbsd_update_thread_list;
+  t->to_has_thread_control = tc_schedlock;
+  super_resume = t->to_resume;
+  t->to_resume = fbsd_resume;
   super_wait = t->to_wait;
   t->to_wait = fbsd_wait;
+  t->to_post_startup_inferior = fbsd_post_startup_inferior;
+  t->to_post_attach = fbsd_post_attach;
 #ifdef TDP_RFPPWAIT
   t->to_follow_fork = fbsd_follow_fork;
   t->to_insert_fork_catchpoint = fbsd_insert_fork_catchpoint;
   t->to_remove_fork_catchpoint = fbsd_remove_fork_catchpoint;
   t->to_insert_vfork_catchpoint = fbsd_insert_vfork_catchpoint;
   t->to_remove_vfork_catchpoint = fbsd_remove_vfork_catchpoint;
-  t->to_post_startup_inferior = fbsd_post_startup_inferior;
-  t->to_post_attach = fbsd_post_attach;
 #endif
 #ifdef PL_FLAG_EXEC
   t->to_insert_exec_catchpoint = fbsd_insert_exec_catchpoint;
@@ -509,3 +843,21 @@  fbsd_nat_add_target (struct target_ops *t)
 #endif
   add_target (t);
 }
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+extern initialize_file_ftype _initialize_fbsd_nat;
+
+void
+_initialize_fbsd_nat (void)
+{
+#ifdef PT_LWPINFO
+  add_setshow_boolean_cmd ("fbsd-lwp", class_maintenance,
+			   &debug_fbsd_lwp, _("\
+Set debugging of FreeBSD lwp module."), _("\
+Show debugging of FreeBSD lwp module."), _("\
+Enables printf debugging output."),
+			   NULL,
+			   NULL,
+			   &setdebuglist, &showdebuglist);
+#endif
+}