nptl_db/td_ta_clear_event.c

   1 /* Globally disable events.
   2    Copyright (C) 1999-2020 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    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <stdint.h>
  21 #include "thread_dbP.h"
  22
  23
  24 td_err_e
  25 td_ta_clear_event (const td_thragent_t *ta_arg, td_thr_events_t *event)
  26 {
  27   td_thragent_t *const ta = (td_thragent_t *) ta_arg;
  28   td_err_e err;
  29   psaddr_t eventmask = 0;
  30   void *copy = NULL;
  31
  32   LOG ("td_ta_clear_event");
  33
  34   /* Test whether the TA parameter is ok.  */
  35   if (! ta_ok (ta))
  36     return TD_BADTA;
  37
  38   /* Fetch the old event mask from the inferior and modify it in place.  */
  39   err = DB_GET_SYMBOL (eventmask, ta, __nptl_threads_events);
  40   if (err == TD_OK)
  41     err = DB_GET_STRUCT (copy, ta, eventmask, td_thr_events_t);
  42   if (err == TD_OK)
  43     {
  44       uint32_t idx;
  45       for (idx = 0; idx < TD_EVENTSIZE; ++idx)
  46         {
  47           psaddr_t word;
  48           uint32_t mask;
  49           err = DB_GET_FIELD_LOCAL (word, ta, copy,
  50                                     td_thr_events_t, event_bits, idx);
  51           if (err != TD_OK)
  52             break;
  53           mask = (uintptr_t) word;
  54           mask &= ~event->event_bits[idx];
  55           word = (psaddr_t) (uintptr_t) mask;
  56           err = DB_PUT_FIELD_LOCAL (ta, copy,
  57                                     td_thr_events_t, event_bits, idx, word);
  58           if (err != TD_OK)
  59             break;
  60         }
  61       if (err == TD_NOAPLIC)
  62         {
  63           err = TD_OK;
  64           while (idx < TD_EVENTSIZE)
  65             if (event->event_bits[idx++] != 0)
  66               {
  67                 err = TD_NOEVENT;
  68                 break;
  69               }
  70         }
  71       if (err == TD_OK)
  72         /* Now write it back to the inferior.  */
  73         err = DB_PUT_STRUCT (ta, eventmask, td_thr_events_t, copy);
  74     }
  75
  76   return err;
  77 }