usr/src/lib/libc/port/sys/getpagesizes.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include "lint.h"
  30 #include <sys/types.h>
  31 #include <unistd.h>
  32 #include <sys/syscall.h>
  33
  34 /*
  35  * mman.h contains "#pragma redefine_extname getpagesizes getpagesizes2".
  36  * Applications that are still calling getpagesizes() instead of
  37  * getpagesizes2() are 'legacy' applications that have not been recompiled
  38  * since the #pragma redefine_extname change.
  39  *
  40  * Depending on the platform, 'legacy' applications may not be given the full
  41  * set of supported page sizes to prevent them from inadvertantly using 'new'
  42  * large pagesizes that might cause application failure or low system memory
  43  * conditions.
  44  *
  45  * The first parameter to the SYS_getpagesizes syscall is effectively
  46  * a 'legacy' boolean flag used as such in the kernel.
  47  */
  48 int
  49 getpagesizes(size_t pagesize[], int nelem)
  50 {
  51         return (syscall(SYS_getpagesizes, 1, pagesize, nelem));
  52 }
  53
  54 int
  55 getpagesizes2(size_t pagesize[], int nelem)
  56 {
  57         return (syscall(SYS_getpagesizes, 0, pagesize, nelem));
  58 }