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101 lines
3.0 KiB
C++
101 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Benjamin Smedberg <benjamin@smedbergs.us>
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* Taras Glek <tglek@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef mozilla_FileUtils_h
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#define mozilla_FileUtils_h
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#if defined(XP_UNIX) || defined(XP_OS2)
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# include <unistd.h>
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#elif defined(XP_WIN)
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# include <io.h>
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#endif
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#include "prio.h"
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namespace mozilla {
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/**
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* AutoFDClose is a RAII wrapper for PRFileDesc.
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**/
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class AutoFDClose
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{
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public:
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AutoFDClose(PRFileDesc* fd = nsnull) : mFD(fd) { }
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~AutoFDClose() { if (mFD) PR_Close(mFD); }
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PRFileDesc* operator= (PRFileDesc *fd) {
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if (mFD) PR_Close(mFD);
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mFD = fd;
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return fd;
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}
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operator PRFileDesc* () { return mFD; }
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PRFileDesc** operator &() { *this = nsnull; return &mFD; }
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private:
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PRFileDesc *mFD;
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};
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/**
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* Instances close() their fds when they go out of scope.
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*/
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struct ScopedClose
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{
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ScopedClose(int aFd=-1) : mFd(aFd) {}
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~ScopedClose() {
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if (0 <= mFd) {
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close(mFd);
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}
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}
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int mFd;
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};
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/**
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* Fallocate efficiently and continuously allocates files via fallocate-type APIs.
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* This is useful for avoiding fragmentation.
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* On sucess the file be padded with zeros to grow to aLength.
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*
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* @param aFD file descriptor.
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* @param aLength length of file to grow to.
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* @return true on success.
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*/
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NS_COM_GLUE bool fallocate(PRFileDesc *aFD, PRInt64 aLength);
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} // namespace mozilla
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#endif
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