linuxthreads_db/td_ta_new.c

   1 /* Attach to target process.
   2    Copyright (C) 1999, 2001 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <stddef.h>
  22 #include <stdlib.h>
  23
  24 #include "thread_dbP.h"
  25
  26
  27 /* Datatype for the list of known thread agents.  Normally there will
  28    be exactly one so we don't spend much though on making it fast.  */
  29 struct agent_list *__td_agent_list;
  30
  31
  32 td_err_e
  33 td_ta_new (struct ps_prochandle *ps, td_thragent_t **ta)
  34 {
  35   psaddr_t addr;
  36   struct agent_list *elemp;
  37
  38   LOG (__FUNCTION__);
  39
  40   /* Get the global event mask.  This is one of the variables which
  41      are new in the thread library to enable debugging.  If it is
  42      not available we cannot debug.  */
  43   if (td_lookup (ps, PTHREAD_THREADS_EVENTS, &addr) != PS_OK)
  44     return TD_NOLIBTHREAD;
  45
  46   /* Fill in the appropriate information.  */
  47   *ta = (td_thragent_t *) malloc (sizeof (td_thragent_t));
  48   if (*ta == NULL)
  49     return TD_MALLOC;
  50
  51   /* Store the proc handle which we will pass to the callback functions
  52      back into the debugger.  */
  53   (*ta)->ph = ps;
  54
  55   /* Remember the address.  */
  56   (*ta)->pthread_threads_eventsp = (td_thr_events_t *) addr;
  57
  58   /* Get the pointer to the variable pointing to the thread descriptor
  59      with the last event.  */
  60   if (td_lookup (ps, PTHREAD_LAST_EVENT, &(*ta)->pthread_last_event) != PS_OK)
  61     {
  62     free_return:
  63       free (*ta);
  64       return TD_ERR;
  65     }
  66
  67   /* Get the pointer to the variable containing the number of active
  68      threads.  */
  69   if (td_lookup (ps, PTHREAD_HANDLES_NUM, &(*ta)->pthread_handles_num)
  70       != PS_OK)
  71     goto free_return;
  72
  73   /* See whether the library contains the necessary symbols.  */
  74   if (td_lookup (ps, PTHREAD_HANDLES, &addr) != PS_OK)
  75     goto free_return;
  76
  77   (*ta)->handles = (struct pthread_handle_struct *) addr;
  78
  79
  80   if (td_lookup (ps, PTHREAD_KEYS, &addr) != PS_OK)
  81     goto free_return;
  82
  83   /* Cast to the right type.  */
  84   (*ta)->keys = (struct pthread_key_struct *) addr;
  85
  86   /* Find out about the maximum number of threads.  Old implementations
  87      don't provide this information.  In this case we assume that the
  88      debug  library is compiled with the same values.  */
  89   if (td_lookup (ps, LINUXTHREADS_PTHREAD_THREADS_MAX, &addr) != PS_OK)
  90     (*ta)->pthread_threads_max = PTHREAD_THREADS_MAX;
  91   else
  92     {
  93       if (ps_pdread (ps, addr, &(*ta)->pthread_threads_max, sizeof (int))
  94           != PS_OK)
  95         goto free_return;
  96     }
  97
  98   /* Similar for the maximum number of thread local data keys.  */
  99   if (td_lookup (ps, LINUXTHREADS_PTHREAD_KEYS_MAX, &addr) != PS_OK)
 100     (*ta)->pthread_keys_max = PTHREAD_KEYS_MAX;
 101   else
 102     {
 103       if (ps_pdread (ps, addr, &(*ta)->pthread_keys_max, sizeof (int))
 104           != PS_OK)
 105         goto free_return;
 106     }
 107
 108   /* And for the size of the second level arrays for the keys.  */
 109   if (td_lookup (ps, LINUXTHREADS_PTHREAD_SIZEOF_DESCR, &addr) != PS_OK)
 110     (*ta)->sizeof_descr = sizeof (struct _pthread_descr_struct);
 111   else
 112     {
 113       if (ps_pdread (ps, addr, &(*ta)->sizeof_descr, sizeof (int)) != PS_OK)
 114         goto free_return;
 115     }
 116
 117   /* Now add the new agent descriptor to the list.  */
 118   elemp = (struct agent_list *) malloc (sizeof (struct agent_list));
 119   if (elemp == NULL)
 120     {
 121       /* Argh, now that everything else worked...  */
 122       free (*ta);
 123       return TD_MALLOC;
 124     }
 125
 126   /* We don't care for thread-safety here.  */
 127   elemp->ta = *ta;
 128   elemp->next = __td_agent_list;
 129   __td_agent_list = elemp;
 130
 131   return TD_OK;
 132 }