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/* Attach to target process.
Copyright (C) 1999 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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 <gnu/lib-names.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;
struct agent_list *elemp;
LOG (__FUNCTION__);
/* 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 (ps_pglobal_lookup (ps, LIBPTHREAD_SO,
"__pthread_threads_events", &addr) != PS_OK)
return TD_NOLIBTHREAD;
/* 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 (ps_pglobal_lookup (ps, LIBPTHREAD_SO,
"__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 (ps_pglobal_lookup (ps, LIBPTHREAD_SO,
"__pthread_handles_num",
&(*ta)->pthread_handles_num) != PS_OK)
goto free_return;
/* See whether the library contains the necessary symbols. */
if (ps_pglobal_lookup (ps, LIBPTHREAD_SO, "__pthread_handles",
&addr) != PS_OK)
goto free_return;
(*ta)->handles = (struct pthread_handle_struct *) addr;
if (ps_pglobal_lookup (ps, LIBPTHREAD_SO, "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 (ps_pglobal_lookup (ps, LIBPTHREAD_SO,
"__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 (ps_pglobal_lookup (ps, LIBPTHREAD_SO,
"__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 (ps_pglobal_lookup (ps, LIBPTHREAD_SO,
"__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;
}
/* Similar for the maximum number of thread local data keys. */
if (ps_pglobal_lookup (ps, LIBPTHREAD_SO,
"__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;
}
/* 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;
}
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