freebsd/lib/libkse/thread/thr_attr_setguardsize.c

/*
 * Copyright (C) 2001 Jason Evans <jasone@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(s), this list of conditions and the following disclaimer
 *    unmodified other than the allowable addition of one or more
 *    copyright notices.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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 <sys/param.h>
#include <errno.h>
#include <pthread.h>
#include "thr_private.h"

__weak_reference(_pthread_attr_setguardsize, pthread_attr_setguardsize);

int
_pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize)
{
	int	ret;

	/* Check for invalid arguments. */
	if (attr == NULL || *attr == NULL)
		ret = EINVAL;
	else {
		/*
		 * Round guardsize up to the nearest multiple of
		 * _thr_page_size.
		 */
		if (guardsize % _thr_page_size != 0)
			guardsize = ((guardsize / _thr_page_size) + 1) *
			    _thr_page_size;

		/* Save the stack size. */
		(*attr)->guardsize_attr = guardsize;
		ret = 0;
	}
	return(ret);
}