зеркало из https://github.com/mozilla/gecko-dev.git
69 строки
1.6 KiB
C++
69 строки
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_FileUtils_h
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#define mozilla_FileUtils_h
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#include "nscore.h" // nullptr
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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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#include "mozilla/Scoped.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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* Instances |PR_Close| their fds when they go out of scope.
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**/
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struct ScopedClosePRFDTraits
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{
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typedef PRFileDesc* type;
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static type empty() { return NULL; }
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static void release(type fd) {
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if (fd != NULL) {
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PR_Close(fd);
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}
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}
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};
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typedef Scoped<ScopedClosePRFDTraits> AutoFDClose;
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/**
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* ScopedCloseFD is a RAII wrapper for POSIX file descriptors
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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 ScopedCloseFDTraits
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{
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typedef int type;
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static type empty() { return -1; }
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static void release(type fd) {
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if (fd != -1) {
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close(fd);
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}
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}
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};
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typedef Scoped<ScopedCloseFDTraits> ScopedClose;
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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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