зеркало из https://github.com/mozilla/gecko-dev.git
101 строка
3.0 KiB
C++
101 строка
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* 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 Mozilla code.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* Mozilla Foundation.
|
|
* Portions created by the Initial Developer are Copyright (C) 2010
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Benjamin Smedberg <benjamin@smedbergs.us>
|
|
* Taras Glek <tglek@mozilla.com>
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
#ifndef mozilla_FileUtils_h
|
|
#define mozilla_FileUtils_h
|
|
|
|
#if defined(XP_UNIX) || defined(XP_OS2)
|
|
# include <unistd.h>
|
|
#elif defined(XP_WIN)
|
|
# include <io.h>
|
|
#endif
|
|
#include "prio.h"
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* AutoFDClose is a RAII wrapper for PRFileDesc.
|
|
**/
|
|
class AutoFDClose
|
|
{
|
|
public:
|
|
AutoFDClose(PRFileDesc* fd = nsnull) : mFD(fd) { }
|
|
~AutoFDClose() { if (mFD) PR_Close(mFD); }
|
|
|
|
PRFileDesc* operator= (PRFileDesc *fd) {
|
|
if (mFD) PR_Close(mFD);
|
|
mFD = fd;
|
|
return fd;
|
|
}
|
|
|
|
operator PRFileDesc* () { return mFD; }
|
|
PRFileDesc** operator &() { *this = nsnull; return &mFD; }
|
|
|
|
private:
|
|
PRFileDesc *mFD;
|
|
};
|
|
|
|
/**
|
|
* Instances close() their fds when they go out of scope.
|
|
*/
|
|
struct ScopedClose
|
|
{
|
|
ScopedClose(int aFd=-1) : mFd(aFd) {}
|
|
~ScopedClose() {
|
|
if (0 <= mFd) {
|
|
close(mFd);
|
|
}
|
|
}
|
|
int mFd;
|
|
};
|
|
|
|
/**
|
|
* Fallocate efficiently and continuously allocates files via fallocate-type APIs.
|
|
* This is useful for avoiding fragmentation.
|
|
* On sucess the file be padded with zeros to grow to aLength.
|
|
*
|
|
* @param aFD file descriptor.
|
|
* @param aLength length of file to grow to.
|
|
* @return true on success.
|
|
*/
|
|
NS_COM_GLUE bool fallocate(PRFileDesc *aFD, PRInt64 aLength);
|
|
|
|
} // namespace mozilla
|
|
#endif
|