libpthread/linuxthreads_db/td_thr_event_getmsg.c

   1 /* Retrieve event.
   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@cygnus.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 <stddef.h>
  21 #include <string.h>
  22
  23 #include "thread_dbP.h"
  24
  25
  26 td_err_e
  27 td_thr_event_getmsg (const td_thrhandle_t *th, td_event_msg_t *msg)
  28 {
  29   td_eventbuf_t event;
  30
  31   LOG ("td_thr_event_getmsg");
  32
  33   /* If the thread descriptor has not yet been created there cannot be
  34      any event.  */
  35   if (th->th_unique == NULL)
  36     return TD_NOMSG;
  37
  38   /* Read the even structure from the target.  */
  39   if (ps_pdread (th->th_ta_p->ph,
  40                  ((char *) th->th_unique
  41                   + offsetof (struct _pthread_descr_struct, p_eventbuf)),
  42                  &event, sizeof (td_eventbuf_t)) != PS_OK)
  43     return TD_ERR;      /* XXX Other error value?  */
  44
  45   /* Check whether an event occurred.  */
  46   if (event.eventnum == TD_EVENT_NONE)
  47     /* Nothing.  */
  48     return TD_NOMSG;
  49
  50   /* Fill the user's data structure.  */
  51   msg->event = event.eventnum;
  52   msg->th_p = th;
  53   msg->msg.data = (uintptr_t) event.eventdata;
  54
  55   /* And clear the event message in the target.  */
  56   memset (&event, '\0', sizeof (td_eventbuf_t));
  57   if (ps_pdwrite (th->th_ta_p->ph,
  58                   ((char *) th->th_unique
  59                    + offsetof (struct _pthread_descr_struct, p_eventbuf)),
  60                   &event, sizeof (td_eventbuf_t)) != PS_OK)
  61     return TD_ERR;      /* XXX Other error value?  */
  62
  63   return TD_OK;
  64 }