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/* Retrieve event.
Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.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"
#include <linuxthreads/internals.h>
td_err_e
td_ta_event_getmsg (const td_thragent_t *ta, td_event_msg_t *msg)
{
/* XXX I cannot think of another way but using a static variable. */
static td_thrhandle_t th;
td_eventbuf_t event;
psaddr_t addr;
LOG ("td_ta_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. */
if (ps_pdread (ta->ph, ta->pthread_last_event,
&addr, sizeof (void *)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* If the pointer is NULL no event occurred. */
if (addr == 0)
return TD_NOMSG;
/* Read the even structure from the target. */
if (ps_pdread (ta->ph,
((char *) addr
+ offsetof (struct _pthread_descr_struct, p_eventbuf)),
&event, sizeof (td_eventbuf_t)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
/* Check whether an event occurred. */
if (event.eventnum == TD_EVENT_NONE)
{
/* Oh well, this means the last event was already read. So
we have to look for any other event. */
struct pthread_handle_struct handles[ta->pthread_threads_max];
int num;
int i;
/* Read the number of currently active threads. */
if (ps_pdread (ta->ph, ta->pthread_handles_num, &num, sizeof (int))
!= PS_OK)
return TD_ERR; /* XXX Other error value? */
/* Now read the handles. */
if (ps_pdread (ta->ph, ta->handles, handles,
ta->pthread_threads_max * sizeof (handles[0])) != PS_OK)
return TD_ERR; /* XXX Other error value? */
for (i = 0; i < ta->pthread_threads_max && num > 0; ++i)
{
if (handles[i].h_descr == NULL)
/* No entry here. */
continue;
/* First count this active thread. */
--num;
if (handles[i].h_descr == addr)
/* We already handled this. */
continue;
/* Read the event data for this thread. */
if (ps_pdread (ta->ph,
((char *) handles[i].h_descr
+ offsetof (struct _pthread_descr_struct,
p_eventbuf)),
&event, sizeof (td_eventbuf_t)) != PS_OK)
return TD_ERR;
if (event.eventnum != TD_EVENT_NONE)
{
/* We found a thread with an unreported event. */
addr = handles[i].h_descr;
break;
}
}
/* If we haven't found any other event signal this to the user. */
if (event.eventnum == TD_EVENT_NONE)
return TD_NOMSG;
}
/* Generate the thread descriptor. */
th.th_ta_p = (td_thragent_t *) ta;
th.th_unique = addr;
/* Fill the user's data structure. */
msg->event = event.eventnum;
msg->th_p = &th;
msg->msg.data = (uintptr_t) event.eventdata;
/* And clear the event message in the target. */
memset (&event, '\0', sizeof (td_eventbuf_t));
if (ps_pdwrite (ta->ph,
((char *) addr
+ offsetof (struct _pthread_descr_struct, p_eventbuf)),
&event, sizeof (td_eventbuf_t)) != PS_OK)
return TD_ERR; /* XXX Other error value? */
return TD_OK;
}
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