1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/sysinfo.h>
30
31 #include <dirent.h>
32 #include <stdio.h>
33 #include <string.h>
34 #include <unistd.h>
35
36 #include "private/get_cpu_count_from_string.h"
37 #include "private/ScopedReaddir.h"
38
__get_cpu_count(const char * sys_file)39 int __get_cpu_count(const char* sys_file) {
40 int cpu_count = 1;
41 FILE* fp = fopen(sys_file, "re");
42 if (fp != nullptr) {
43 char* line = nullptr;
44 size_t allocated_size = 0;
45 if (getline(&line, &allocated_size, fp) != -1) {
46 cpu_count = GetCpuCountFromString(line);
47 }
48 free(line);
49 fclose(fp);
50 }
51 return cpu_count;
52 }
53
get_nprocs_conf()54 int get_nprocs_conf() {
55 // It's unclear to me whether this is intended to be "possible" or "present",
56 // but on mobile they're unlikely to differ.
57 return __get_cpu_count("/sys/devices/system/cpu/possible");
58 }
59
get_nprocs()60 int get_nprocs() {
61 return __get_cpu_count("/sys/devices/system/cpu/online");
62 }
63
get_phys_pages()64 long get_phys_pages() {
65 struct sysinfo si;
66 sysinfo(&si);
67 return (static_cast<int64_t>(si.totalram) * si.mem_unit) / PAGE_SIZE;
68 }
69
get_avphys_pages()70 long get_avphys_pages() {
71 struct sysinfo si;
72 sysinfo(&si);
73 return ((static_cast<int64_t>(si.freeram) + si.bufferram) * si.mem_unit) / PAGE_SIZE;
74 }
75