LCOV - code coverage report
Current view: directory - xpcom/glue - FileUtils.h (source / functions) Found Hit Coverage
Test: app.info Lines: 6 0 0.0 %
Date: 2012-06-02 Functions: 3 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Mozilla Foundation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *   Benjamin Smedberg <benjamin@smedbergs.us>
      24                 :  *   Taras Glek <tglek@mozilla.com>
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      28                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : #ifndef mozilla_FileUtils_h
      41                 : #define mozilla_FileUtils_h
      42                 : 
      43                 : #if defined(XP_UNIX) || defined(XP_OS2)
      44                 : # include <unistd.h>
      45                 : #elif defined(XP_WIN)
      46                 : # include <io.h>
      47                 : #endif
      48                 : #include "prio.h"
      49                 : 
      50                 : namespace mozilla {
      51                 : 
      52                 : /**
      53                 :  * AutoFDClose is a RAII wrapper for PRFileDesc.
      54                 :  **/
      55                 : class AutoFDClose
      56                 : {
      57                 : public:
      58                 :   AutoFDClose(PRFileDesc* fd = nsnull) : mFD(fd) { }
      59                 :   ~AutoFDClose() { if (mFD) PR_Close(mFD); }
      60                 : 
      61               0 :   PRFileDesc* operator= (PRFileDesc *fd) {
      62               0 :     if (mFD) PR_Close(mFD);
      63               0 :     mFD = fd;
      64               0 :     return fd;
      65                 :   }
      66                 : 
      67               0 :   operator PRFileDesc* () { return mFD; }
      68               0 :   PRFileDesc** operator &() { *this = nsnull; return &mFD; }
      69                 : 
      70                 : private:
      71                 :   PRFileDesc *mFD;
      72                 : };
      73                 : 
      74                 : /**
      75                 :  * Instances close() their fds when they go out of scope.
      76                 :  */
      77                 : struct ScopedClose
      78                 : {
      79                 :   ScopedClose(int aFd=-1) : mFd(aFd) {}
      80                 :   ~ScopedClose() {
      81                 :     if (0 <= mFd) {
      82                 :       close(mFd);
      83                 :     }
      84                 :   }
      85                 :   int mFd;
      86                 : };
      87                 : 
      88                 : /**
      89                 :  * Fallocate efficiently and continuously allocates files via fallocate-type APIs.
      90                 :  * This is useful for avoiding fragmentation.
      91                 :  * On sucess the file be padded with zeros to grow to aLength.
      92                 :  *
      93                 :  * @param aFD file descriptor.
      94                 :  * @param aLength length of file to grow to.
      95                 :  * @return true on success.
      96                 :  */
      97                 : NS_COM_GLUE bool fallocate(PRFileDesc *aFD, PRInt64 aLength);
      98                 : 
      99                 : } // namespace mozilla
     100                 : #endif

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