nptl_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@redhat.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
  23
  24 static td_err_e
  25 check_thread_list (const td_thrhandle_t *th, psaddr_t head)
  26 {
  27   list_t list;
  28   td_err_e result = TD_NOTHR;
  29
  30   if (ps_pdread (th->th_ta_p->ph, head, &list.next, sizeof (list.next))
  31       != PS_OK)
  32     return TD_ERR;      /* XXX Other error value?  */
  33
  34   while (list.next != head)
  35     if ((psaddr_t) list.next - offsetof (struct pthread, header.data.list)
  36         == th->th_unique)
  37       {
  38         result = TD_OK;
  39         break;
  40       }
  41     else if (ps_pdread (th->th_ta_p->ph, list.next, &list.next,
  42                         sizeof (list.next)) != PS_OK)
  43       {
  44         result = TD_ERR;        /* XXX Other error value?  */
  45         break;
  46       }
  47
  48   return result;
  49 }
  50
  51
  52 td_err_e
  53 td_thr_validate (const td_thrhandle_t *th)
  54 {
  55   LOG ("td_thr_validate");
  56
  57   /* First check the list with threads using user allocated stacks.  */
  58   td_err_e result = check_thread_list (th, th->th_ta_p->stack_user);
  59
  60   /* If our thread is not on this list search the list with stack
  61      using implementation allocated stacks.  */
  62   if (result == TD_NOTHR)
  63     result = check_thread_list (th, th->th_ta_p->stack_used);
  64
  65   return result;
  66 }