libpthread/linuxthreads_db/td_ta_new.c

   1 /* Attach to target process.
   2    Copyright (C) 1999, 2001, 2002, 2003 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stddef.h>
  21 #include <stdlib.h>
  22 #include <string.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   psaddr_t versaddr;
  37   char versbuf[sizeof (VERSION)];
  38   struct agent_list *elemp;
  39
  40   LOG ("td_ta_new");
  41
  42   /* Get the global event mask.  This is one of the variables which
  43      are new in the thread library to enable debugging.  If it is
  44      not available we cannot debug.  */
  45   if (td_lookup (ps, PTHREAD_THREADS_EVENTS, &addr) != PS_OK)
  46     return TD_NOLIBTHREAD;
  47
  48   /* Check whether the versions match.  */
  49   if (td_lookup (ps, LINUXTHREADS_VERSION, &versaddr) != PS_OK)
  50     return TD_VERSION;
  51   if (ps_pdread (ps, versaddr, versbuf, sizeof (versbuf)) != PS_OK)
  52     return TD_ERR;
  53
  54   versbuf[sizeof (versbuf) - 1] = '\0';
  55   if (strcmp (versbuf, VERSION) != 0)
  56     /* Not the right version.  */
  57     return TD_VERSION;
  58
  59   /* Fill in the appropriate information.  */
  60   *ta = (td_thragent_t *) malloc (sizeof (td_thragent_t));
  61   if (*ta == NULL)
  62     return TD_MALLOC;
  63
  64   /* Store the proc handle which we will pass to the callback functions
  65      back into the debugger.  */
  66   (*ta)->ph = ps;
  67
  68   /* Remember the address.  */
  69   (*ta)->pthread_threads_eventsp = (td_thr_events_t *) addr;
  70
  71   /* Get the pointer to the variable pointing to the thread descriptor
  72      with the last event.  */
  73   if (td_lookup (ps, PTHREAD_LAST_EVENT, &(*ta)->pthread_last_event) != PS_OK)
  74     {
  75     free_return:
  76       free (*ta);
  77       return TD_ERR;
  78     }
  79
  80   /* Get the pointer to the variable containing the number of active
  81      threads.  */
  82   if (td_lookup (ps, PTHREAD_HANDLES_NUM, &(*ta)->pthread_handles_num)
  83       != PS_OK)
  84     goto free_return;
  85
  86   /* See whether the library contains the necessary symbols.  */
  87   if (td_lookup (ps, PTHREAD_HANDLES, &addr) != PS_OK)
  88     goto free_return;
  89
  90   (*ta)->handles = (struct pthread_handle_struct *) addr;
  91
  92
  93   if (td_lookup (ps, PTHREAD_KEYS, &addr) != PS_OK)
  94     goto free_return;
  95
  96   /* Cast to the right type.  */
  97   (*ta)->keys = (struct pthread_key_struct *) addr;
  98
  99   /* Find out about the maximum number of threads.  Old implementations
 100      don't provide this information.  In this case we assume that the
 101      debug  library is compiled with the same values.  */
 102   if (td_lookup (ps, LINUXTHREADS_PTHREAD_THREADS_MAX, &addr) != PS_OK)
 103     (*ta)->pthread_threads_max = PTHREAD_THREADS_MAX;
 104   else
 105     {
 106       if (ps_pdread (ps, addr, &(*ta)->pthread_threads_max, sizeof (int))
 107           != PS_OK)
 108         goto free_return;
 109     }
 110
 111   /* Similar for the maximum number of thread local data keys.  */
 112   if (td_lookup (ps, LINUXTHREADS_PTHREAD_KEYS_MAX, &addr) != PS_OK)
 113     (*ta)->pthread_keys_max = PTHREAD_KEYS_MAX;
 114   else
 115     {
 116       if (ps_pdread (ps, addr, &(*ta)->pthread_keys_max, sizeof (int))
 117           != PS_OK)
 118         goto free_return;
 119     }
 120
 121   /* And for the size of the second level arrays for the keys.  */
 122   if (td_lookup (ps, LINUXTHREADS_PTHREAD_SIZEOF_DESCR, &addr) != PS_OK)
 123     (*ta)->sizeof_descr = sizeof (struct _pthread_descr_struct);
 124   else
 125     {
 126       if (ps_pdread (ps, addr, &(*ta)->sizeof_descr, sizeof (int)) != PS_OK)
 127         goto free_return;
 128       /* Don't let bogons in the inferior make us mess ourselves.  */
 129       if ((*ta)->sizeof_descr > sizeof (struct _pthread_descr_struct))
 130         (*ta)->sizeof_descr = sizeof (struct _pthread_descr_struct);
 131     }
 132
 133   /* Now add the new agent descriptor to the list.  */
 134   elemp = (struct agent_list *) malloc (sizeof (struct agent_list));
 135   if (elemp == NULL)
 136     {
 137       /* Argh, now that everything else worked...  */
 138       free (*ta);
 139       return TD_MALLOC;
 140     }
 141
 142   /* We don't care for thread-safety here.  */
 143   elemp->ta = *ta;
 144   elemp->next = __td_agent_list;
 145   __td_agent_list = elemp;
 146
 147   return TD_OK;
 148 }