libpthread/linuxthreads_db/td_thr_validate.c

   1 /* Validate a thread handle.
   2    Copyright (C) 1999, 2001, 2002 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 "thread_dbP.h"
  21
  22
  23 td_err_e
  24 td_thr_validate (const td_thrhandle_t *th)
  25 {
  26   struct pthread_handle_struct *handles = th->th_ta_p->handles;
  27   int pthread_threads_max = th->th_ta_p->pthread_threads_max;
  28   int cnt;
  29   struct pthread_handle_struct phc;
  30
  31   LOG ("td_thr_validate");
  32
  33   /* A special case: if the program just starts up the handle is
  34      NULL.  */
  35   if (th->th_unique == NULL)
  36     {
  37       /* Read the first handle.  If the pointer to the thread
  38          descriptor is not NULL this is an error.  */
  39       if (ps_pdread (th->th_ta_p->ph, handles, &phc,
  40                      sizeof (struct pthread_handle_struct)) != PS_OK)
  41         return TD_ERR;  /* XXX Other error value?  */
  42
  43       return phc.h_descr == NULL ? TD_OK : TD_NOTHR;
  44     }
  45
  46   /* Now get all descriptors, one after the other.  */
  47   for (cnt = 0; cnt < pthread_threads_max; ++cnt, ++handles)
  48     {
  49       if (ps_pdread (th->th_ta_p->ph, handles, &phc,
  50                      sizeof (struct pthread_handle_struct)) != PS_OK)
  51         return TD_ERR;  /* XXX Other error value?  */
  52
  53       if (phc.h_descr != NULL && phc.h_descr == th->th_unique)
  54         {
  55           struct _pthread_descr_struct pds;
  56
  57           if (ps_pdread (th->th_ta_p->ph, phc.h_descr, &pds,
  58                          th->th_ta_p->sizeof_descr) != PS_OK)
  59             return TD_ERR;      /* XXX Other error value?  */
  60
  61           /* XXX There should be another test using the TID but this is
  62              currently not available.  */
  63           return pds.p_terminated != 0 ? TD_NOTHR : TD_OK;
  64         }
  65     }
  66
  67   return TD_ERR;
  68 }