101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/* Retrieve event.
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Copyright (C) 1999, 2001, 2002, 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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, td_event_msg_t *msg)
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{
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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_ta_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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psaddr_t addr;
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if (ps_pdread (ta->ph, ta->pthread_last_event,
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&addr, sizeof (struct pthread *)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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if (addr == 0)
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/* Nothing waiting. */
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return TD_NOMSG;
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/* Read the event structure from the target. */
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td_eventbuf_t event;
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if (ps_pdread (ta->ph, (char *) addr + offsetof (struct pthread, eventbuf),
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&event, sizeof (td_eventbuf_t)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* If the structure is on the list there better be an event recorded. */
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if (event.eventnum == TD_EVENT_NONE)
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return TD_DBERR;
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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 = addr;
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/* Fill the user's data structure. */
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msg->event = event.eventnum;
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msg->th_p = &th;
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msg->msg.data = (uintptr_t) event.eventdata;
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/* And clear the event message in the target. */
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memset (&event, '\0', sizeof (td_eventbuf_t));
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if (ps_pdwrite (ta->ph, (char *) addr + offsetof (struct pthread, eventbuf),
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&event, sizeof (td_eventbuf_t)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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/* Get the pointer to the next descriptor with an event. */
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psaddr_t next;
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if (ps_pdread (ta->ph, (char *) addr + offsetof (struct pthread, nextevent),
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&next, sizeof (struct pthread *)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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if (next == addr)
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return TD_DBERR;
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/* Store the pointer in the list head variable. */
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if (ps_pdwrite (ta->ph, ta->pthread_last_event,
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&next, sizeof (struct pthread *)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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if (next != NULL)
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{
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/* Clear the next pointer in the current descriptor. */
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next = NULL;
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if (ps_pdwrite (ta->ph,
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(char *) addr + offsetof (struct pthread, nextevent),
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&next, sizeof (struct pthread *)) != PS_OK)
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return TD_ERR; /* XXX Other error value? */
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}
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return TD_OK;
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}
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