| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <sys/sysinfo.h> |
| |
| #include <dirent.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "private/get_cpu_count_from_string.h" |
| #include "private/ScopedReaddir.h" |
| |
| int __get_cpu_count(const char* sys_file) { |
| int cpu_count = 1; |
| FILE* fp = fopen(sys_file, "re"); |
| if (fp != nullptr) { |
| char* line = nullptr; |
| size_t allocated_size = 0; |
| if (getline(&line, &allocated_size, fp) != -1) { |
| cpu_count = GetCpuCountFromString(line); |
| free(line); |
| } |
| fclose(fp); |
| } |
| return cpu_count; |
| } |
| |
| int get_nprocs_conf() { |
| // It's unclear to me whether this is intended to be "possible" or "present", |
| // but on mobile they're unlikely to differ. |
| return __get_cpu_count("/sys/devices/system/cpu/possible"); |
| } |
| |
| int get_nprocs() { |
| return __get_cpu_count("/sys/devices/system/cpu/online"); |
| } |
| |
| long get_phys_pages() { |
| struct sysinfo si; |
| sysinfo(&si); |
| return (static_cast<int64_t>(si.totalram) * si.mem_unit) / PAGE_SIZE; |
| } |
| |
| long get_avphys_pages() { |
| struct sysinfo si; |
| sysinfo(&si); |
| return ((static_cast<int64_t>(si.freeram) + si.bufferram) * si.mem_unit) / PAGE_SIZE; |
| } |