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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include "thread_dbP.h"
  22 #include <linuxthreads/internals.h>
  23
  24
  25 td_err_e
  26 td_thr_validate (const td_thrhandle_t *th)
  27 {
  28   struct pthread_handle_struct *handles = th->th_ta_p->handles;
  29   int pthread_threads_max = th->th_ta_p->pthread_threads_max;
  30   int cnt;
  31   struct pthread_handle_struct phc;
  32
  33   LOG ("td_thr_validate");
  34
  35   /* A special case: if the program just starts up the handle is
  36      NULL.  */
  37   if (th->th_unique == NULL)
  38     {
  39       /* Read the first handle.  If the pointer to the thread
  40          descriptor is not NULL this is an error.  */
  41       if (ps_pdread (th->th_ta_p->ph, handles, &phc,
  42                      sizeof (struct pthread_handle_struct)) != PS_OK)
  43         return TD_ERR;  /* XXX Other error value?  */
  44
  45       return phc.h_descr == NULL ? TD_OK : TD_NOTHR;
  46     }
  47
  48   /* Now get all descriptors, one after the other.  */
  49   for (cnt = 0; cnt < pthread_threads_max; ++cnt, ++handles)
  50     {
  51       if (ps_pdread (th->th_ta_p->ph, handles, &phc,
  52                      sizeof (struct pthread_handle_struct)) != PS_OK)
  53         return TD_ERR;  /* XXX Other error value?  */
  54
  55       if (phc.h_descr != NULL && phc.h_descr == th->th_unique)
  56         {
  57           struct _pthread_descr_struct pds;
  58
  59           if (ps_pdread (th->th_ta_p->ph, phc.h_descr, &pds,
  60                          th->th_ta_p->sizeof_descr) != PS_OK)
  61             return TD_ERR;      /* XXX Other error value?  */
  62
  63           /* XXX There should be another test using the TID but this is
  64              currently not available.  */
  65           return pds.p_terminated != 0 ? TD_NOTHR : TD_OK;
  66         }
  67     }
  68
  69   return TD_ERR;
  70 }