d6c861719f
commit b96ddedf4ffbba57faaaf8bf18781a7abfb9d4c1 Author: Carl Pearson <pearson@illinois.edu> Date: Mon Sep 23 16:53:54 2019 -0500 add newline to result.hpp commit c7e9f6ff4775bf86f9af216cbe311f65bf985f63 Author: Carl Pearson <pearson@illinois.edu> Date: Mon Sep 23 16:53:09 2019 -0500 add EPERM to fs operations commit bac918fd022006cad0da899c06ac31e9db59a2fb Author: Carl Pearson <pearson@illinois.edu> Date: Mon Sep 23 16:49:25 2019 -0500 add filesystem cache interface
43 lines
952 B
C++
43 lines
952 B
C++
#pragma once
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#include <unistd.h>
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#include <fstream>
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#include <iostream>
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#include "result.hpp"
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#include "init.hpp"
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#include "detail/fs.hpp"
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namespace perfect {
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enum DropCaches_t {
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PAGECACHE = 0x1,
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ENTRIES = 0x2
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};
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// commit filesystem caches to disk
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Result sync() {
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// http://man7.org/linux/man-pages/man2/sync.2.html
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::sync(); // always successful
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return Result::SUCCESS;
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}
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Result drop_caches(const DropCaches_t mode) {
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using detail::write_str;
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const std::string path = "/proc/sys/vm/drop_caches";
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if (mode & PAGECACHE & ENTRIES) {
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PERFECT_SUCCESS_OR_RETURN(write_str(path, "3"));
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} else if (mode & PAGECACHE) {
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PERFECT_SUCCESS_OR_RETURN(write_str(path, "1"));
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} else if (mode & ENTRIES) {
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PERFECT_SUCCESS_OR_RETURN(write_str(path, "2"));
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} else {
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std::cerr << "unexpected mode: " << mode << "\n";
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return Result::UNKNOWN;
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}
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return Result::SUCCESS;
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}
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} |