/* Get thread information.

   Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <stddef.h>

#include <string.h>

#include <stdint.h>

#include "thread_dbP.h"

td_err_e

td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop)

{

  td_err_e err;

  void *copy;

  psaddr_t tls, schedpolicy, schedprio, cancelhandling, tid, report_events;

  LOG ("td_thr_get_info");

  if (th->th_unique == 0)

    {

      /* Special case for the main thread before initialization.  */

      copy = NULL;

      tls = 0;

      cancelhandling = 0;

      schedpolicy = SCHED_OTHER;

      schedprio = 0;

      tid = 0;

      err = DB_GET_VALUE (report_events, th->th_ta_p,

			  __nptl_initial_report_events, 0);

    }

  else

    {

      /* Copy the whole descriptor in once so we can access the several

	 fields locally.  Excess copying in one go is much better than

	 multiple ps_pdread calls.  */

      err = DB_GET_STRUCT (copy, th->th_ta_p, th->th_unique, pthread);

      if (err != TD_OK)

	return err;

      err = DB_GET_FIELD_ADDRESS (tls, th->th_ta_p, th->th_unique,

				  pthread, specific, 0);

      if (err != TD_OK)

	return err;

      err = DB_GET_FIELD_LOCAL (schedpolicy, th->th_ta_p, copy, pthread,

				schedpolicy, 0);

      if (err != TD_OK)

	return err;

      err = DB_GET_FIELD_LOCAL (schedprio, th->th_ta_p, copy, pthread,

				schedparam_sched_priority, 0);

      if (err != TD_OK)

	return err;

      err = DB_GET_FIELD_LOCAL (tid, th->th_ta_p, copy, pthread, tid, 0);

      if (err != TD_OK)

	return err;

      err = DB_GET_FIELD_LOCAL (cancelhandling, th->th_ta_p, copy, pthread,

				cancelhandling, 0);

      if (err != TD_OK)

	return err;

      err = DB_GET_FIELD_LOCAL (report_events, th->th_ta_p, copy, pthread,

				report_events, 0);

    }

  if (err != TD_OK)

    return err;

  /* Fill in information.  Clear first to provide reproducable

     results for the fields we do not fill in.  */

  memset (infop, '\0', sizeof (td_thrinfo_t));

  infop->ti_tid = (thread_t) th->th_unique;

  infop->ti_tls = (char *) tls;

  infop->ti_pri = ((uintptr_t) schedpolicy == SCHED_OTHER

		   ? 0 : (uintptr_t) schedprio);

  infop->ti_type = TD_THR_USER;

  if ((((int) (uintptr_t) cancelhandling) & EXITING_BITMASK) == 0)

    /* XXX For now there is no way to get more information.  */

    infop->ti_state = TD_THR_ACTIVE;

  else if ((((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) == 0)

    infop->ti_state = TD_THR_ZOMBIE;

  else

    infop->ti_state = TD_THR_UNKNOWN;

  /* Initialization which are the same in both cases.  */

  infop->ti_ta_p = th->th_ta_p;

  infop->ti_lid = tid == 0 ? ps_getpid (th->th_ta_p->ph) : (uintptr_t) tid;

  infop->ti_traceme = report_events != 0;

  if (copy != NULL)

    err = DB_GET_FIELD_LOCAL (infop->ti_startfunc, th->th_ta_p, copy, pthread,

			      start_routine, 0);

  if (copy != NULL && err == TD_OK)

    {

      uint32_t idx;

      for (idx = 0; idx < TD_EVENTSIZE; ++idx)

	{

	  psaddr_t word;

	  err = DB_GET_FIELD_LOCAL (word, th->th_ta_p, copy, pthread,

				    eventbuf_eventmask_event_bits, idx);

	  if (err != TD_OK)

	    break;

	  infop->ti_events.event_bits[idx] = (uintptr_t) word;

	}

      if (err == TD_NOAPLIC)

	memset (&infop->ti_events.event_bits[idx], 0,

		(TD_EVENTSIZE - idx) * sizeof infop->ti_events.event_bits[0]);

    }

  return err;

}