db4a195744
The sysctl(HW_PAGESIZE) call cannot fail on FreeBSD kernels at least. And even if it failed for some improbable reason, PAGE_SIZE is a safe value to return. Discussed with: jilles Sponsored by: The FreeBSD Foundation MFC after: 1 week
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/*
|
|
* Copyright (c) 1989, 1993
|
|
* The Regents of the University of California. 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.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)getpagesize.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <errno.h>
|
|
#include <link.h>
|
|
#include <unistd.h>
|
|
|
|
#include "libc_private.h"
|
|
|
|
/*
|
|
* This is unlikely to change over the running time of any
|
|
* program, so we cache the result to save some syscalls.
|
|
*
|
|
* NB: This function may be called from malloc(3) at initialization
|
|
* NB: so must not result in a malloc(3) related call!
|
|
*/
|
|
|
|
int
|
|
getpagesize(void)
|
|
{
|
|
int mib[2];
|
|
static int value;
|
|
size_t size;
|
|
int error;
|
|
|
|
if (value != 0)
|
|
return (value);
|
|
|
|
error = _elf_aux_info(AT_PAGESZ, &value, sizeof(value));
|
|
if (error == 0 && value != 0)
|
|
return (value);
|
|
|
|
mib[0] = CTL_HW;
|
|
mib[1] = HW_PAGESIZE;
|
|
size = sizeof value;
|
|
if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) == -1)
|
|
return (PAGE_SIZE);
|
|
|
|
return (value);
|
|
}
|