nptl_db/td_ta_clear_event.c

   1 /* Globally disable events.
   2    Copyright (C) 1999-2022 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
  22
  23 td_err_e
  24 td_ta_clear_event (const td_thragent_t *ta_arg, td_thr_events_t *event)
  25 {
  26   td_thragent_t *const ta = (td_thragent_t *) ta_arg;
  27   td_err_e err;
  28   psaddr_t eventmask = 0;
  29   void *copy = NULL;
  30
  31   LOG ("td_ta_clear_event");
  32
  33   /* Test whether the TA parameter is ok.  */
  34   if (! ta_ok (ta))
  35     return TD_BADTA;
  36
  37   /* Fetch the old event mask from the inferior and modify it in place.  */
  38   err = DB_GET_SYMBOL (eventmask, ta, __nptl_threads_events);
  39   if (err == TD_OK)
  40     err = DB_GET_STRUCT (copy, ta, eventmask, td_thr_events_t);
  41   if (err == TD_OK)
  42     {
  43       uint32_t idx;
  44       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
  45         {
  46           psaddr_t word;
  47           uint32_t mask;
  48           err = DB_GET_FIELD_LOCAL (word, ta, copy,
  49                                     td_thr_events_t, event_bits, idx);
  50           if (err != TD_OK)
  51             break;
  52           mask = (uintptr_t) word;
  53           mask &= ~event->event_bits[idx];
  54           word = (psaddr_t) (uintptr_t) mask;
  55           err = DB_PUT_FIELD_LOCAL (ta, copy,
  56                                     td_thr_events_t, event_bits, idx, word);
  57           if (err != TD_OK)
  58             break;
  59         }
  60       if (err == TD_NOAPLIC)
  61         {
  62           err = TD_OK;
  63           while (idx < TD_EVENTSIZE)
  64             if (event->event_bits[idx++] != 0)
  65               {
  66                 err = TD_NOEVENT;
  67                 break;
  68               }
  69         }
  70       if (err == TD_OK)
  71         /* Now write it back to the inferior.  */
  72         err = DB_PUT_STRUCT (ta, eventmask, td_thr_events_t, copy);
  73     }
  74
  75   return err;
  76 }