freebsd-src/lib/libc_r/uthread/uthread_attr_get_np.c
Alexey Zelkin 618a8b4df0 Improve pthread_attr_get_np() by enabling it to return thread's real stack
address instead of specified by pthread_attr_t passed to pthread_create().

Suggested by:	deischen
2003-02-03 10:08:45 +00:00

58 lines
2.0 KiB
C

/*
* Copyright (c) 2002,2003 Alexey Zelkin <phantom@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <errno.h>
#include <string.h>
#include <pthread.h>
#include <pthread_np.h>
#include "pthread_private.h"
__weak_reference(_pthread_attr_get_np, pthread_attr_get_np);
int
_pthread_attr_get_np(pthread_t pid, pthread_attr_t *dst)
{
int ret;
if (pid == NULL || dst == NULL || *dst == NULL)
return (EINVAL);
if ((ret = _find_thread(pid)) != 0)
return (ret);
memcpy(*dst, &pid->attr, sizeof(struct pthread_attr));
/*
* Special case, if stack address was not provided by caller
* of pthread_create(), then return address allocated internally
*/
if ((*dst)->stackaddr_attr == NULL)
(*dst)->stackaddr_attr = pid->stack;
return (0);
}