1  /* Iterate over a process's thread-specific data.
       2     Copyright (C) 1999-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <stdint.h>
      20  #include "thread_dbP.h"
      21  #include <alloca.h>
      22  
      23  td_err_e
      24  td_ta_tsd_iter (const td_thragent_t *ta_arg, td_key_iter_f *callback,
      25  		void *cbdata_p)
      26  {
      27    td_thragent_t *const ta = (td_thragent_t *) ta_arg;
      28    td_err_e err;
      29    void *keys;
      30    size_t keys_nb, keys_elemsize;
      31    psaddr_t addr;
      32    uint32_t idx;
      33  
      34    LOG ("td_ta_tsd_iter");
      35  
      36    /* Test whether the TA parameter is ok.  */
      37    if (! ta_ok (ta))
      38      return TD_BADTA;
      39  
      40    /* This makes sure we have the size information on hand.  */
      41    addr = 0;
      42    err = _td_locate_field (ta,
      43  			  ta->ta_var___pthread_keys, SYM_DESC___pthread_keys,
      44  			  (psaddr_t) 0 + 1, &addr);
      45    if (err != TD_OK)
      46      return err;
      47  
      48    /* Now copy in the entire array of key descriptors.  */
      49    keys_elemsize = (addr - (psaddr_t) 0) / 8;
      50    keys_nb = keys_elemsize * DB_DESC_NELEM (ta->ta_var___pthread_keys);
      51    keys = __alloca (keys_nb);
      52    err = DB_GET_SYMBOL (addr, ta, __pthread_keys);
      53    if (err != TD_OK)
      54      return err;
      55    if (ps_pdread (ta->ph, addr, keys, keys_nb) != PS_OK)
      56      return TD_ERR;
      57  
      58    /* Now get all descriptors, one after the other.  */
      59    for (idx = 0; idx < DB_DESC_NELEM (ta->ta_var___pthread_keys); ++idx)
      60      {
      61        psaddr_t seq, destr;
      62        err = DB_GET_FIELD_LOCAL (seq, ta, keys, pthread_key_struct, seq, 0);
      63        if (err != TD_OK)
      64  	return err;
      65        if (((uintptr_t) seq) & 1)
      66  	{
      67  	  err = DB_GET_FIELD_LOCAL (destr, ta, keys, pthread_key_struct,
      68  				    destr, 0);
      69  	  if (err != TD_OK)
      70  	    return err;
      71  	  /* Return with an error if the callback returns a nonzero value.  */
      72  	  if (callback ((thread_key_t) idx, destr, cbdata_p) != 0)
      73  	    return TD_DBERR;
      74  	}
      75        /* Advance to the next element in the copied array.  */
      76        keys += keys_elemsize;
      77      }
      78  
      79    return TD_OK;
      80  }