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e9ce8d39 | 1 | /* |
5b2abdfb | 2 | * Copyright (c) 1989, 1993 |
e9ce8d39 A |
3 | * The Regents of the University of California. All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
e9ce8d39 A |
13 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
5b2abdfb | 30 | #if defined(LIBC_SCCS) && !defined(lint) |
9385eb3d | 31 | static char sccsid[] = "@(#)getpagesize.c 8.1 (Berkeley) 6/4/93"; |
5b2abdfb | 32 | #endif /* LIBC_SCCS and not lint */ |
9385eb3d | 33 | #include <sys/cdefs.h> |
1f2f436a | 34 | __FBSDID("$FreeBSD: src/lib/libc/gen/getpagesize.c,v 1.6 2007/01/09 00:27:54 imp Exp $"); |
e9ce8d39 | 35 | |
9385eb3d A |
36 | #include <sys/param.h> |
37 | #include <sys/sysctl.h> | |
38 | ||
1f2f436a A |
39 | #include <unistd.h> |
40 | ||
9385eb3d A |
41 | /* |
42 | * This is unlikely to change over the running time of any | |
43 | * program, so we cache the result to save some syscalls. | |
44 | * | |
45 | * NB: This function may be called from malloc(3) at initialization | |
46 | * NB: so must not result in a malloc(3) related call! | |
47 | */ | |
e9ce8d39 | 48 | |
5b2abdfb | 49 | int |
9385eb3d | 50 | getpagesize() |
e9ce8d39 | 51 | { |
9385eb3d A |
52 | int mib[2]; |
53 | static int value; | |
54 | size_t size; | |
5b2abdfb | 55 | |
9385eb3d A |
56 | if (!value) { |
57 | mib[0] = CTL_HW; | |
58 | mib[1] = HW_PAGESIZE; | |
59 | size = sizeof value; | |
60 | if (sysctl(mib, 2, &value, &size, NULL, 0) == -1) | |
61 | return (-1); | |
62 | } | |
63 | return (value); | |
e9ce8d39 | 64 | } |