nptl_db/td_ta_tsd_iter.c

   1 /* Iterate over a process's thread-specific data.
   2    Copyright (C) 1999-2018 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <stdint.h>
  21 #include "thread_dbP.h"
  22 #include <alloca.h>
  23
  24 td_err_e
  25 td_ta_tsd_iter (const td_thragent_t *ta_arg, td_key_iter_f *callback,
  26                 void *cbdata_p)
  27 {
  28   td_thragent_t *const ta = (td_thragent_t *) ta_arg;
  29   td_err_e err;
  30   void *keys;
  31   size_t keys_nb, keys_elemsize;
  32   psaddr_t addr;
  33   uint32_t idx;
  34
  35   LOG ("td_ta_tsd_iter");
  36
  37   /* Test whether the TA parameter is ok.  */
  38   if (! ta_ok (ta))
  39     return TD_BADTA;
  40
  41   /* This makes sure we have the size information on hand.  */
  42   addr = 0;
  43   err = _td_locate_field (ta,
  44                           ta->ta_var___pthread_keys, SYM_DESC___pthread_keys,
  45                           (psaddr_t) 0 + 1, &addr);
  46   if (err != TD_OK)
  47     return err;
  48
  49   /* Now copy in the entire array of key descriptors.  */
  50   keys_elemsize = (addr - (psaddr_t) 0) / 8;
  51   keys_nb = keys_elemsize * DB_DESC_NELEM (ta->ta_var___pthread_keys);
  52   keys = __alloca (keys_nb);
  53   err = DB_GET_SYMBOL (addr, ta, __pthread_keys);
  54   if (err != TD_OK)
  55     return err;
  56   if (ps_pdread (ta->ph, addr, keys, keys_nb) != PS_OK)
  57     return TD_ERR;
  58
  59   /* Now get all descriptors, one after the other.  */
  60   for (idx = 0; idx < DB_DESC_NELEM (ta->ta_var___pthread_keys); ++idx)
  61     {
  62       psaddr_t seq, destr;
  63       err = DB_GET_FIELD_LOCAL (seq, ta, keys, pthread_key_struct, seq, 0);
  64       if (err != TD_OK)
  65         return err;
  66       if (((uintptr_t) seq) & 1)
  67         {
  68           err = DB_GET_FIELD_LOCAL (destr, ta, keys, pthread_key_struct,
  69                                     destr, 0);
  70           if (err != TD_OK)
  71             return err;
  72           /* Return with an error if the callback returns a nonzero value.  */
  73           if (callback ((thread_key_t) idx, destr, cbdata_p) != 0)
  74             return TD_DBERR;
  75         }
  76       /* Advance to the next element in the copied array.  */
  77       keys += keys_elemsize;
  78     }
  79
  80   return TD_OK;
  81 }