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/* Get thread information.
Copyright (C) 1999-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <stddef.h>
#include <string.h>
#include <stdint.h>
#include "thread_dbP.h"
td_err_e
td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop)
{
td_err_e err;
void *copy;
psaddr_t tls, schedpolicy, schedprio, cancelhandling, tid, report_events;
LOG ("td_thr_get_info");
if (th->th_unique == 0)
{
/* Special case for the main thread before initialization. */
copy = NULL;
tls = 0;
cancelhandling = 0;
schedpolicy = SCHED_OTHER;
schedprio = 0;
tid = 0;
/* Ignore errors to obtain the __nptl_initial_report_events
value because GDB no longer uses the events interface, and
other libthread_db consumers hopefully can handle different
libpthread/lds.o load orders. */
report_events = 0;
(void) DB_GET_VALUE (report_events, th->th_ta_p,
__nptl_initial_report_events, 0);
err = TD_OK;
}
else
{
/* Copy the whole descriptor in once so we can access the several
fields locally. Excess copying in one go is much better than
multiple ps_pdread calls. */
err = DB_GET_STRUCT (copy, th->th_ta_p, th->th_unique, pthread);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_ADDRESS (tls, th->th_ta_p, th->th_unique,
pthread, specific, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (schedpolicy, th->th_ta_p, copy, pthread,
schedpolicy, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (schedprio, th->th_ta_p, copy, pthread,
schedparam_sched_priority, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (tid, th->th_ta_p, copy, pthread, tid, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (cancelhandling, th->th_ta_p, copy, pthread,
cancelhandling, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (report_events, th->th_ta_p, copy, pthread,
report_events, 0);
}
if (err != TD_OK)
return err;
/* Fill in information. Clear first to provide reproducible
results for the fields we do not fill in. */
memset (infop, '\0', sizeof (td_thrinfo_t));
infop->ti_tid = (thread_t) th->th_unique;
infop->ti_tls = (char *) tls;
infop->ti_pri = ((uintptr_t) schedpolicy == SCHED_OTHER
? 0 : (uintptr_t) schedprio);
infop->ti_type = TD_THR_USER;
if ((((int) (uintptr_t) cancelhandling) & EXITING_BITMASK) == 0)
/* XXX For now there is no way to get more information. */
infop->ti_state = TD_THR_ACTIVE;
else if ((((int) (uintptr_t) cancelhandling) & TERMINATED_BITMASK) == 0)
infop->ti_state = TD_THR_ZOMBIE;
else
infop->ti_state = TD_THR_UNKNOWN;
/* Initialization which are the same in both cases. */
infop->ti_ta_p = th->th_ta_p;
infop->ti_lid = tid == 0 ? ps_getpid (th->th_ta_p->ph) : (uintptr_t) tid;
infop->ti_traceme = report_events != 0;
if (copy != NULL)
err = DB_GET_FIELD_LOCAL (infop->ti_startfunc, th->th_ta_p, copy, pthread,
start_routine, 0);
if (copy != NULL && err == TD_OK)
{
uint32_t idx;
for (idx = 0; idx < TD_EVENTSIZE; ++idx)
{
psaddr_t word;
err = DB_GET_FIELD_LOCAL (word, th->th_ta_p, copy, pthread,
eventbuf_eventmask_event_bits, idx);
if (err != TD_OK)
break;
infop->ti_events.event_bits[idx] = (uintptr_t) word;
}
if (err == TD_NOAPLIC)
memset (&infop->ti_events.event_bits[idx], 0,
(TD_EVENTSIZE - idx) * sizeof infop->ti_events.event_bits[0]);
}
return err;
}
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