8b5df3920f
A couple of dodgy cases where we cast away const, but otherwise pretty boring. Change-Id: Ibc39ebd525377792b5911464be842121c20f03b9
112 lines
3.2 KiB
C++
112 lines
3.2 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/sysinfo.h>
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#include <dirent.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include "private/ScopedReaddir.h"
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static bool __matches_cpuN(const char* s) {
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// The %c trick is to ensure that we have the anchored match "^cpu[0-9]+$".
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unsigned cpu;
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char dummy;
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return (sscanf(s, "cpu%u%c", &cpu, &dummy) == 1);
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}
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int get_nprocs_conf() {
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// On x86 kernels you can use /proc/cpuinfo for this, but on ARM kernels offline CPUs disappear
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// from there. This method works on both.
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ScopedReaddir reader("/sys/devices/system/cpu");
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if (reader.IsBad()) {
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return 1;
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}
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int result = 0;
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dirent* entry;
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while ((entry = reader.ReadEntry()) != NULL) {
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if (entry->d_type == DT_DIR && __matches_cpuN(entry->d_name)) {
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++result;
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}
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}
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return result;
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}
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int get_nprocs() {
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FILE* fp = fopen("/proc/stat", "re");
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if (fp == NULL) {
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return 1;
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}
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int result = 0;
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char buf[256];
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while (fgets(buf, sizeof(buf), fp) != NULL) {
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// Extract just the first word from the line.
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// 'cpu0 7976751 1364388 3116842 469770388 8629405 0 49047 0 0 0'
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char* p = strchr(buf, ' ');
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if (p != NULL) {
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*p = 0;
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}
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if (__matches_cpuN(buf)) {
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++result;
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}
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}
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fclose(fp);
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return result;
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}
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static int __get_meminfo_page_count(const char* pattern) {
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FILE* fp = fopen("/proc/meminfo", "re");
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if (fp == NULL) {
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return -1;
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}
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int page_count = -1;
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char buf[256];
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while (fgets(buf, sizeof(buf), fp) != NULL) {
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long total;
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if (sscanf(buf, pattern, &total) == 1) {
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page_count = static_cast<int>(total / (PAGE_SIZE / 1024));
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break;
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}
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}
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fclose(fp);
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return page_count;
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}
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long get_phys_pages() {
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return __get_meminfo_page_count("MemTotal: %ld kB");
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}
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long get_avphys_pages() {
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return __get_meminfo_page_count("MemFree: %ld kB");
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}
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