prmmap.c

Netscape NSPR库源码

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape Portable Runtime (NSPR).
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

/*
 *********************************************************************
 *
 * Memory-mapped files
 *
 *********************************************************************
 */

#include "primpl.h"

PR_IMPLEMENT(PRFileMap *) PR_CreateFileMap(
    PRFileDesc *fd,
    PRInt64 size,
    PRFileMapProtect prot)
{
    PRFileMap *fmap;

    PR_ASSERT(prot == PR_PROT_READONLY || prot == PR_PROT_READWRITE
            || prot == PR_PROT_WRITECOPY);
    fmap = PR_NEWZAP(PRFileMap);
    if (NULL == fmap) {
	PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
	return NULL;
    }
    fmap->fd = fd;
    fmap->prot = prot;
    if (_PR_MD_CREATE_FILE_MAP(fmap, size) == PR_SUCCESS) {
	return fmap;
    } else {
	PR_DELETE(fmap);
	return NULL;
    }
}

PR_IMPLEMENT(PRInt32) PR_GetMemMapAlignment(void)
{
    return _PR_MD_GET_MEM_MAP_ALIGNMENT();
}

PR_IMPLEMENT(void *) PR_MemMap(
    PRFileMap *fmap,
    PROffset64 offset,
    PRUint32 len)
{
    return _PR_MD_MEM_MAP(fmap, offset, len);
}

PR_IMPLEMENT(PRStatus) PR_MemUnmap(void *addr, PRUint32 len)
{
    return _PR_MD_MEM_UNMAP(addr, len);
}

PR_IMPLEMENT(PRStatus) PR_CloseFileMap(PRFileMap *fmap)
{
    return _PR_MD_CLOSE_FILE_MAP(fmap);
}