349 lines
12 KiB
C++
349 lines
12 KiB
C++
/*
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* Copyright (C) 2008 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 <asm/page.h>
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#include <bionic_tls.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h> // For FOPEN_MAX.
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#include <string.h>
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#include <sys/sysconf.h>
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#include <time.h>
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#include <unistd.h>
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#include "private/ScopedReaddir.h"
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/* seems to be the default on Linux, per the GLibc sources and my own digging */
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#define SYSTEM_CLK_TCK 100
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#define SYSTEM_IOV_MAX 1024
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#define SYSTEM_DELAYTIMER_MAX 2147483647
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#define SYSTEM_MQ_OPEN_MAX 8
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#define SYSTEM_MQ_PRIO_MAX 32768
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#define SYSTEM_SEM_NSEMS_MAX 256
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#define SYSTEM_SEM_VALUE_MAX 0x3fffffff /* see bionic/semaphore.c */
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#define SYSTEM_SIGQUEUE_MAX 32
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#define SYSTEM_TIMER_MAX 32
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#define SYSTEM_LOGIN_NAME_MAX 256
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#define SYSTEM_TTY_NAME_MAX 32
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/* the following depends on our implementation */
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#define SYSTEM_ATEXIT_MAX 65536 /* our implementation is unlimited */
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#define SYSTEM_THREAD_STACK_MIN 32768 /* lower values may be possible, but be conservative */
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#define SYSTEM_THREAD_THREADS_MAX 2048 /* really unlimited */
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#define SYSTEM_2_C_BIND _POSIX_VERSION /* Posix C binding version */
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#define SYSTEM_2_C_VER _POSIX2_C_VERSION
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#define SYSTEM_2_C_DEV -1 /* Posix C development tools unsupported on the device */
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#define SYSTEM_2_FORT_DEV -1 /* Fortran development unsupported */
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#define SYSTEM_2_FORT_RUN -1 /* Fortran runtime unsupported */
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#define SYSTEM_2_SW_DEV -1 /* posix software dev utilities unsupported */
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#define SYSTEM_2_LOCALEDEF -1 /* localedef() unimplemented */
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#define SYSTEM_2_UPE -1 /* No UPE for you ! (User Portability Utilities) */
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#define SYSTEM_2_VERSION -1 /* No posix command-line tools */
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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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static int __sysconf_nprocessors_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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static int __sysconf_nprocessors_onln() {
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FILE* fp = fopen("/proc/stat", "r");
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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(const char* pattern) {
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FILE* fp = fopen("/proc/meminfo", "r");
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if (fp == NULL) {
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return -1;
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}
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int result = -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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result = (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 result;
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}
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static int __sysconf_phys_pages() {
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return __get_meminfo("MemTotal: %ld kB");
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}
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static int __sysconf_avphys_pages() {
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return __get_meminfo("MemFree: %ld kB");
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}
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static int __sysconf_monotonic_clock() {
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timespec t;
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int rc = clock_getres(CLOCK_MONOTONIC, &t);
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return (rc == -1) ? -1 : _POSIX_VERSION;
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}
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int sysconf(int name) {
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switch (name) {
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#ifdef _POSIX_ARG_MAX
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case _SC_ARG_MAX: return _POSIX_ARG_MAX;
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#endif
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#ifdef _POSIX2_BC_BASE_MAX
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case _SC_BC_BASE_MAX: return _POSIX2_BC_BASE_MAX;
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#endif
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#ifdef _POSIX2_BC_DIM_MAX
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case _SC_BC_DIM_MAX: return _POSIX2_BC_DIM_MAX;
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#endif
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#ifdef _POSIX2_BC_SCALE_MAX
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case _SC_BC_SCALE_MAX: return _POSIX2_BC_SCALE_MAX;
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#endif
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#ifdef _POSIX2_BC_STRING_MAX
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case _SC_BC_STRING_MAX: return _POSIX2_BC_STRING_MAX;
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#endif
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case _SC_CHILD_MAX: return CHILD_MAX;
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case _SC_CLK_TCK: return SYSTEM_CLK_TCK;
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#ifdef _POSIX2_COLL_WEIGHTS_MASK
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case _SC_COLL_WEIGHTS_MAX: return _POSIX2_COLL_WEIGHTS_MASK;
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#endif
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#ifdef _POSIX2_EXPR_NEST_MAX
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case _SC_EXPR_NEST_MAX: return _POSIX2_EXPR_NEST_MAX;
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#endif
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#ifdef _POSIX2_LINE_MAX
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case _SC_LINE_MAX: return _POSIX2_LINE_MAX;
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#endif
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case _SC_NGROUPS_MAX: return NGROUPS_MAX;
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case _SC_OPEN_MAX: return OPEN_MAX;
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//case _SC_PASS_MAX: return PASS_MAX;
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case _SC_2_C_BIND: return SYSTEM_2_C_BIND;
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case _SC_2_C_DEV: return SYSTEM_2_C_DEV;
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case _SC_2_C_VERSION: return SYSTEM_2_C_VER;
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//case _SC_2_CHAR_TERM: return ;
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case _SC_2_FORT_DEV: return SYSTEM_2_FORT_DEV;
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case _SC_2_FORT_RUN: return SYSTEM_2_FORT_RUN;
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case _SC_2_LOCALEDEF: return SYSTEM_2_LOCALEDEF;
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case _SC_2_SW_DEV: return SYSTEM_2_SW_DEV;
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case _SC_2_UPE: return SYSTEM_2_UPE;
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case _SC_2_VERSION: return SYSTEM_2_VERSION;
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#ifdef _POSIX_JOB_CONTROL
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case _SC_JOB_CONTROL: return _POSIX_JOB_CONTROL;
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#endif
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#ifdef _POSIX_SAVED_IDS
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case _SC_SAVED_IDS: return _POSIX_SAVED_IDS;
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#endif
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#ifdef _POSIX_VERSION
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case _SC_VERSION: return _POSIX_VERSION;
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#endif
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//case _SC_RE_DUP_<AX: return ;
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case _SC_STREAM_MAX: return FOPEN_MAX;
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//case _SC_TZNAME_MAX: return ;
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#if _XOPEN_CRYPT
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case _SC_XOPEN_CRYPT: return _XOPEN_CRYPT;
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#endif
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#ifdef _XOPEN_ENH_I18N
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case _SC_XOPEN_ENH_I18N: return _XOPEN_ENH_I18N;
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#endif
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#ifdef _XOPEN_SHM
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case _SC_XOPEN_SHM: return _XOPEN_SHM;
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#endif
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#ifdef _XOPEN_VERSION
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case _SC_XOPEN_VERSION: return _XOPEN_VERSION;
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#endif
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#ifdef _XOPEN_XCU_VERSION
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case _SC_XOPEN_XCU_VERSION: return _XOPEN_XCU_VERSION;
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#endif
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#ifdef _XOPEN_REALTIME
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case _SC_XOPEN_REALTIME: return _XOPEN_REALTIME;
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#endif
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#ifdef _XOPEN_REALTIME_THREADS
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case _SC_XOPEN_REALTIME_THREADS: return _XOPEN_REALTIME_THREADS;
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#endif
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#ifdef _XOPEN_LEGACY
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case _SC_XOPEN_LEGACY: return _XOPEN_LEGACY;
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#endif
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case _SC_ATEXIT_MAX: return SYSTEM_ATEXIT_MAX;
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case _SC_IOV_MAX: return SYSTEM_IOV_MAX;
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case _SC_PAGESIZE: return PAGE_SIZE;
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case _SC_PAGE_SIZE: return PAGE_SIZE;
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#ifdef _XOPEN_UNIX
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case _SC_XOPEN_UNIX: return _XOPEN_UNIX;
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#endif
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// XXX: TODO: XBS5 nonsense
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#ifdef AIO_LISTIO_MAX
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case _SC_AIO_LISTIO_MAX: return AIO_LISTIO_MAX;
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#endif
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#ifdef AIO_MAX
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case _SC_AIO_MAX: return AIO_MAX;
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#endif
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#ifdef AIO_PRIO_DELTA_MAX
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case _SC_AIO_PRIO_DELTA_MAX: return AIO_PRIO_DELTA_MAX;
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#endif
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case _SC_DELAYTIMER_MAX: return SYSTEM_DELAYTIMER_MAX;
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case _SC_MQ_OPEN_MAX: return SYSTEM_MQ_OPEN_MAX;
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case _SC_MQ_PRIO_MAX: return SYSTEM_MQ_PRIO_MAX;
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case _SC_RTSIG_MAX: return RTSIG_MAX;
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case _SC_SEM_NSEMS_MAX: return SYSTEM_SEM_NSEMS_MAX;
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case _SC_SEM_VALUE_MAX: return SYSTEM_SEM_VALUE_MAX;
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case _SC_SIGQUEUE_MAX: return SYSTEM_SIGQUEUE_MAX;
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case _SC_TIMER_MAX: return SYSTEM_TIMER_MAX;
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#ifdef _POSIX_ASYNCHRONOUS_IO
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case _SC_ASYNCHRONOUS_IO: return _POSIX_ASYNCHRONOUS_IO;
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#endif
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#ifdef _POSIX_FSYNC
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case _SC_FSYNC: return _POSIX_FSYNC;
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#endif
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#ifdef _POSIX_MAPPED_FILES
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case _SC_MAPPED_FILES: return _POSIX_MAPPED_FILES;
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#endif
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#ifdef _POSIX_MEMLOCK
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case _SC_MEMLOCK: return _POSIX_MEMLOCK;
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#endif
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#ifdef _POSIX_MEMLOCK_RANGE
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case _SC_MEMLOCK_RANGE: return _POSIX_MEMLOCK_RANGE
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#endif
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#ifdef _POSIX_MEMORY_PROTECTION
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case _SC_MEMORY_PROTECTION: return _POSIX_MEMORY_PROTECTION;
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#endif
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#ifdef _POSIX_MESSAGE_PASSING
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case _SC_MESSAGE_PASSING: return _POSIX_MESSAGE_PASSING;
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#endif
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#ifdef _POSIX_PRIORITIZED_IO
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case _SC_PRIORITIZED_IO: return _POSIX_PRIORITIZED_IO;
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#endif
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#ifdef _POSIX_PRIORITY_SCHEDULING
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case _SC_PRIORITY_SCHEDULING: return _POSIX_PRIORITY_SCHEDULING;
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#endif
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#ifdef _POSIX_REALTIME_SIGNALS
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case _SC_REALTIME_SIGNALS: return _POSIX_REALTIME_SIGNALS;
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#endif
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#ifdef _POSIX_SEMAPHORES
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case _SC_SEMAPHORES: return _POSIX_SEMAPHORES;
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#endif
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#ifdef _POSIX_SHARED_MEMORY_OBJECTS
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case _SC_SHARED_MEMORY_OBJECTS: return _POSIX_SHARED_MEMORY_OBJECTS;
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#endif
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#ifdef _POSIX_SYNCHRONIZED_IO
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case _SC_SYNCHRONIZED_IO: return _POSIX_SYNCHRONIZED_IO;
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#endif
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#ifdef _POSIX_TIMERS
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case _SC_TIMERS: return _POSIX_TIMERS;
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#endif
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case _SC_GETGR_R_SIZE_MAX: return 1024;
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case _SC_GETPW_R_SIZE_MAX: return 1024;
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case _SC_LOGIN_NAME_MAX: return SYSTEM_LOGIN_NAME_MAX;
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case _SC_THREAD_DESTRUCTOR_ITERATIONS:
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return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
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case _SC_THREAD_KEYS_MAX:
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return (BIONIC_TLS_SLOTS - TLS_SLOT_FIRST_USER_SLOT - GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT);
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case _SC_THREAD_STACK_MIN: return SYSTEM_THREAD_STACK_MIN;
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case _SC_THREAD_THREADS_MAX: return SYSTEM_THREAD_THREADS_MAX;
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case _SC_TTY_NAME_MAX: return SYSTEM_TTY_NAME_MAX;
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#ifdef _POSIX_THREADS
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case _SC_THREADS: return _POSIX_THREADS;
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#endif
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#ifdef _POSIX_THREAD_ATTR_STACKADDR
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case _SC_THREAD_ATTR_STACKADDR: return _POSIX_THREAD_ATTR_STACKADDR;
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#endif
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#ifdef _POSIX_THREAD_ATTR_STACKSIZE
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case _SC_THREAD_ATTR_STACKSIZE: return _POSIX_THREAD_ATTR_STACKSIZE;
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#endif
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#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
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case _SC_THREAD_PRIORITY_SCHEDULING: return _POSIX_THREAD_PRIORITY_SCHEDULING;
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#endif
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#ifdef _POSIX_THREAD_PRIO_INHERIT
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case _SC_THREAD_PRIO_INHERIT: return _POSIX_THREAD_PRIO_INHERIT;
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#endif
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#ifdef _POSIX_THREAD_PRIO_PROTECT
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case _SC_THREAD_PRIO_PROTECT: return _POSIX_THREAD_PRIO_PROTECT;
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#endif
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#ifdef _POSIX_THREAD_SAFE_FUNCTIONS
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case _SC_THREAD_SAFE_FUNCTIONS: return _POSIX_THREAD_SAFE_FUNCTIONS
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#endif
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case _SC_MONOTONIC_CLOCK: return __sysconf_monotonic_clock();
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case _SC_NPROCESSORS_CONF: return __sysconf_nprocessors_conf();
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case _SC_NPROCESSORS_ONLN: return __sysconf_nprocessors_onln();
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case _SC_PHYS_PAGES: return __sysconf_phys_pages();
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case _SC_AVPHYS_PAGES: return __sysconf_avphys_pages();
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default:
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/* Posix says EINVAL is the only error that shall be returned,
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* but GLibc uses ENOSYS */
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errno = ENOSYS;
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return -1;
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}
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}
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