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/* Attach to target process.

   Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.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, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include "thread_dbP.h"

/* Datatype for the list of known thread agents.  Normally there will

   be exactly one so we don't spend much though on making it fast.  */

struct agent_list *__td_agent_list;

td_err_e

td_ta_new (struct ps_prochandle *ps, td_thragent_t **ta)

{

  psaddr_t addr;

  psaddr_t versaddr;

  char versbuf[sizeof (VERSION)];

  struct agent_list *elemp;

  LOG ("td_ta_new");

  /* Get the global event mask.  This is one of the variables which

     are new in the thread library to enable debugging.  If it is

     not available we cannot debug.  */

  if (td_lookup (ps, PTHREAD_THREADS_EVENTS, &addr) != PS_OK)

    return TD_NOLIBTHREAD;

  /* Check whether the versions match.  */

  if (td_lookup (ps, LINUXTHREADS_VERSION, &versaddr) != PS_OK)

    return TD_VERSION;

  if (ps_pdread (ps, versaddr, versbuf, sizeof (versbuf)) != PS_OK)

    return TD_ERR;

  versbuf[sizeof (versbuf) - 1] = '\0';

  if (strcmp (versbuf, VERSION) != 0)

    /* Not the right version.  */

    return TD_VERSION;

  /* Fill in the appropriate information.  */

  *ta = (td_thragent_t *) malloc (sizeof (td_thragent_t));

  if (*ta == NULL)

    return TD_MALLOC;

  /* Store the proc handle which we will pass to the callback functions

     back into the debugger.  */

  (*ta)->ph = ps;

  /* Remember the address.  */

  (*ta)->pthread_threads_eventsp = (td_thr_events_t *) addr;

  /* Get the pointer to the variable pointing to the thread descriptor

     with the last event.  */

  if (td_lookup (ps, PTHREAD_LAST_EVENT, &(*ta)->pthread_last_event) != PS_OK)

    {

    free_return:

      free (*ta);

      return TD_ERR;

    }

  /* Get the pointer to the variable containing the number of active

     threads.  */

  if (td_lookup (ps, PTHREAD_HANDLES_NUM, &(*ta)->pthread_handles_num)

      != PS_OK)

    goto free_return;

  /* See whether the library contains the necessary symbols.  */

  if (td_lookup (ps, PTHREAD_HANDLES, &addr) != PS_OK)

    goto free_return;

  (*ta)->handles = (struct pthread_handle_struct *) addr;

  if (td_lookup (ps, PTHREAD_KEYS, &addr) != PS_OK)

    goto free_return;

  /* Cast to the right type.  */

  (*ta)->keys = (struct pthread_key_struct *) addr;

  /* Find out about the maximum number of threads.  Old implementations

     don't provide this information.  In this case we assume that the

     debug  library is compiled with the same values.  */

  if (td_lookup (ps, LINUXTHREADS_PTHREAD_THREADS_MAX, &addr) != PS_OK)

    (*ta)->pthread_threads_max = PTHREAD_THREADS_MAX;

  else

    {

      if (ps_pdread (ps, addr, &(*ta)->pthread_threads_max, sizeof (int))

          != PS_OK)

        goto free_return;

    }

  /* Similar for the maximum number of thread local data keys.  */

  if (td_lookup (ps, LINUXTHREADS_PTHREAD_KEYS_MAX, &addr) != PS_OK)

    (*ta)->pthread_keys_max = PTHREAD_KEYS_MAX;

  else

    {

      if (ps_pdread (ps, addr, &(*ta)->pthread_keys_max, sizeof (int))

          != PS_OK)

        goto free_return;

    }

  /* And for the size of the second level arrays for the keys.  */

  if (td_lookup (ps, LINUXTHREADS_PTHREAD_SIZEOF_DESCR, &addr) != PS_OK)

    (*ta)->sizeof_descr = sizeof (struct _pthread_descr_struct);

  else

    {

      if (ps_pdread (ps, addr, &(*ta)->sizeof_descr, sizeof (int)) != PS_OK)

        goto free_return;

    }

  /* Now add the new agent descriptor to the list.  */

  elemp = (struct agent_list *) malloc (sizeof (struct agent_list));

  if (elemp == NULL)

    {

      /* Argh, now that everything else worked...  */

      free (*ta);

      return TD_MALLOC;

    }

  /* We don't care for thread-safety here.  */

  elemp->ta = *ta;

  elemp->next = __td_agent_list;

  __td_agent_list = elemp;

  return TD_OK;

}