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glibc/nptl_db/td_ta_event_getmsg.c
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/* Retrieve event. | |
Copyright (C) 1999-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <stddef.h> | |
#include <string.h> | |
#include "thread_dbP.h" | |
td_err_e | |
td_ta_event_getmsg (const td_thragent_t *ta_arg, td_event_msg_t *msg) | |
{ | |
td_thragent_t *const ta = (td_thragent_t *) ta_arg; | |
td_err_e err; | |
psaddr_t eventbuf, eventnum, eventdata; | |
psaddr_t thp, next; | |
void *copy; | |
/* XXX I cannot think of another way but using a static variable. */ | |
/* XXX Use at least __thread once it is possible. */ | |
static td_thrhandle_t th; | |
LOG ("td_thr_event_getmsg"); | |
/* Test whether the TA parameter is ok. */ | |
if (! ta_ok (ta)) | |
return TD_BADTA; | |
/* Get the pointer to the thread descriptor with the last event. */ | |
err = DB_GET_VALUE (thp, ta, __nptl_last_event, 0); | |
if (err != TD_OK) | |
return err; | |
if (thp == 0) | |
/* Nothing waiting. */ | |
return TD_NOMSG; | |
/* Copy the event message buffer in from the inferior. */ | |
err = DB_GET_FIELD_ADDRESS (eventbuf, ta, thp, pthread, eventbuf, 0); | |
if (err == TD_OK) | |
err = DB_GET_STRUCT (copy, ta, eventbuf, td_eventbuf_t); | |
if (err != TD_OK) | |
return err; | |
/* Read the event details from the target thread. */ | |
err = DB_GET_FIELD_LOCAL (eventnum, ta, copy, td_eventbuf_t, eventnum, 0); | |
if (err != TD_OK) | |
return err; | |
/* If the structure is on the list there better be an event recorded. */ | |
if ((int) (uintptr_t) eventnum == TD_EVENT_NONE) | |
return TD_DBERR; | |
/* Fill the user's data structure. */ | |
err = DB_GET_FIELD_LOCAL (eventdata, ta, copy, td_eventbuf_t, eventdata, 0); | |
if (err != TD_OK) | |
return err; | |
/* Generate the thread descriptor. */ | |
th.th_ta_p = (td_thragent_t *) ta; | |
th.th_unique = thp; | |
/* Fill the user's data structure. */ | |
msg->msg.data = (uintptr_t) eventdata; | |
msg->event = (uintptr_t) eventnum; | |
msg->th_p = &th; | |
/* And clear the event message in the target. */ | |
memset (copy, 0, ta->ta_sizeof_td_eventbuf_t); | |
err = DB_PUT_STRUCT (ta, eventbuf, td_eventbuf_t, copy); | |
if (err != TD_OK) | |
return err; | |
/* Get the pointer to the next descriptor with an event. */ | |
err = DB_GET_FIELD (next, ta, thp, pthread, nextevent, 0); | |
if (err != TD_OK) | |
return err; | |
/* Store the pointer in the list head variable. */ | |
err = DB_PUT_VALUE (ta, __nptl_last_event, 0, next); | |
if (err != TD_OK) | |
return err; | |
if (next != 0) | |
/* Clear the next pointer in the current descriptor. */ | |
err = DB_PUT_FIELD (ta, thp, pthread, nextevent, 0, 0); | |
return err; | |
} |