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105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/* Retrieve event.
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Copyright (C) 1999-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stddef.h>
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#include <string.h>
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#include "thread_dbP.h"
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td_err_e
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td_ta_event_getmsg (const td_thragent_t *ta_arg, td_event_msg_t *msg)
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{
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td_thragent_t *const ta = (td_thragent_t *) ta_arg;
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td_err_e err;
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psaddr_t eventbuf, eventnum, eventdata;
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psaddr_t thp, next;
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void *copy;
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/* XXX I cannot think of another way but using a static variable. */
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/* XXX Use at least __thread once it is possible. */
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static td_thrhandle_t th;
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LOG ("td_thr_event_getmsg");
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/* Test whether the TA parameter is ok. */
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if (! ta_ok (ta))
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return TD_BADTA;
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/* Get the pointer to the thread descriptor with the last event. */
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err = DB_GET_VALUE (thp, ta, __nptl_last_event, 0);
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if (err != TD_OK)
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return err;
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if (thp == 0)
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/* Nothing waiting. */
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return TD_NOMSG;
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/* Copy the event message buffer in from the inferior. */
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err = DB_GET_FIELD_ADDRESS (eventbuf, ta, thp, pthread, eventbuf, 0);
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if (err == TD_OK)
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err = DB_GET_STRUCT (copy, ta, eventbuf, td_eventbuf_t);
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if (err != TD_OK)
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return err;
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/* Read the event details from the target thread. */
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err = DB_GET_FIELD_LOCAL (eventnum, ta, copy, td_eventbuf_t, eventnum, 0);
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if (err != TD_OK)
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return err;
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/* If the structure is on the list there better be an event recorded. */
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if ((int) (uintptr_t) eventnum == TD_EVENT_NONE)
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return TD_DBERR;
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/* Fill the user's data structure. */
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err = DB_GET_FIELD_LOCAL (eventdata, ta, copy, td_eventbuf_t, eventdata, 0);
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if (err != TD_OK)
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return err;
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/* Generate the thread descriptor. */
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th.th_ta_p = (td_thragent_t *) ta;
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th.th_unique = thp;
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/* Fill the user's data structure. */
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msg->msg.data = (uintptr_t) eventdata;
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msg->event = (uintptr_t) eventnum;
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msg->th_p = &th;
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/* And clear the event message in the target. */
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memset (copy, 0, ta->ta_sizeof_td_eventbuf_t);
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err = DB_PUT_STRUCT (ta, eventbuf, td_eventbuf_t, copy);
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if (err != TD_OK)
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return err;
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/* Get the pointer to the next descriptor with an event. */
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err = DB_GET_FIELD (next, ta, thp, pthread, nextevent, 0);
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if (err != TD_OK)
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return err;
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/* Store the pointer in the list head variable. */
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err = DB_PUT_VALUE (ta, __nptl_last_event, 0, next);
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if (err != TD_OK)
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return err;
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if (next != 0)
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/* Clear the next pointer in the current descriptor. */
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err = DB_PUT_FIELD (ta, thp, pthread, nextevent, 0, 0);
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return err;
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}
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