/* * Copyright (C) 2008 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 #include #include #include #include #include #include // For FOPEN_MAX. #include #include #include #include #include "private/bionic_tls.h" #include "private/ScopedReaddir.h" /* seems to be the default on Linux, per the GLibc sources and my own digging */ #define SYSTEM_CLK_TCK 100 #define SYSTEM_IOV_MAX 1024 #define SYSTEM_DELAYTIMER_MAX 2147483647 #define SYSTEM_MQ_OPEN_MAX 8 #define SYSTEM_MQ_PRIO_MAX 32768 #define SYSTEM_SEM_NSEMS_MAX 256 #define SYSTEM_SEM_VALUE_MAX 0x3fffffff /* see bionic/semaphore.c */ #define SYSTEM_SIGQUEUE_MAX 32 #define SYSTEM_TIMER_MAX 32 #define SYSTEM_LOGIN_NAME_MAX 256 #define SYSTEM_TTY_NAME_MAX 32 /* the following depends on our implementation */ #define SYSTEM_ATEXIT_MAX 65536 /* our implementation is unlimited */ #define SYSTEM_THREAD_THREADS_MAX 2048 /* really unlimited */ #define SYSTEM_2_C_BIND _POSIX_VERSION /* Posix C binding version */ #define SYSTEM_2_C_VER _POSIX2_C_VERSION #define SYSTEM_2_C_DEV -1 /* Posix C development tools unsupported on the device */ #define SYSTEM_2_FORT_DEV -1 /* Fortran development unsupported */ #define SYSTEM_2_FORT_RUN -1 /* Fortran runtime unsupported */ #define SYSTEM_2_SW_DEV -1 /* posix software dev utilities unsupported */ #define SYSTEM_2_LOCALEDEF -1 /* localedef() unimplemented */ #define SYSTEM_2_UPE -1 /* No UPE for you ! (User Portability Utilities) */ #define SYSTEM_2_VERSION -1 /* No posix command-line tools */ static bool __matches_cpuN(const char* s) { // The %c trick is to ensure that we have the anchored match "^cpu[0-9]+$". unsigned cpu; char dummy; return (sscanf(s, "cpu%u%c", &cpu, &dummy) == 1); } static int __sysconf_nprocessors_conf() { // On x86 kernels you can use /proc/cpuinfo for this, but on ARM kernels offline CPUs disappear // from there. This method works on both. ScopedReaddir reader("/sys/devices/system/cpu"); if (reader.IsBad()) { return 1; } int result = 0; dirent* entry; while ((entry = reader.ReadEntry()) != NULL) { if (entry->d_type == DT_DIR && __matches_cpuN(entry->d_name)) { ++result; } } return result; } static int __sysconf_nprocessors_onln() { FILE* fp = fopen("/proc/stat", "r"); if (fp == NULL) { return 1; } int result = 0; char buf[256]; while (fgets(buf, sizeof(buf), fp) != NULL) { // Extract just the first word from the line. // 'cpu0 7976751 1364388 3116842 469770388 8629405 0 49047 0 0 0' char* p = strchr(buf, ' '); if (p != NULL) { *p = 0; } if (__matches_cpuN(buf)) { ++result; } } fclose(fp); return result; } static int __get_meminfo(const char* pattern) { FILE* fp = fopen("/proc/meminfo", "r"); if (fp == NULL) { return -1; } int result = -1; char buf[256]; while (fgets(buf, sizeof(buf), fp) != NULL) { long total; if (sscanf(buf, pattern, &total) == 1) { result = (int) (total / (PAGE_SIZE/1024)); break; } } fclose(fp); return result; } static int __sysconf_phys_pages() { return __get_meminfo("MemTotal: %ld kB"); } static int __sysconf_avphys_pages() { return __get_meminfo("MemFree: %ld kB"); } static int __sysconf_monotonic_clock() { timespec t; int rc = clock_getres(CLOCK_MONOTONIC, &t); return (rc == -1) ? -1 : _POSIX_VERSION; } int sysconf(int name) { switch (name) { #ifdef _POSIX_ARG_MAX case _SC_ARG_MAX: return _POSIX_ARG_MAX; #endif #ifdef _POSIX2_BC_BASE_MAX case _SC_BC_BASE_MAX: return _POSIX2_BC_BASE_MAX; #endif #ifdef _POSIX2_BC_DIM_MAX case _SC_BC_DIM_MAX: return _POSIX2_BC_DIM_MAX; #endif #ifdef _POSIX2_BC_SCALE_MAX case _SC_BC_SCALE_MAX: return _POSIX2_BC_SCALE_MAX; #endif #ifdef _POSIX2_BC_STRING_MAX case _SC_BC_STRING_MAX: return _POSIX2_BC_STRING_MAX; #endif case _SC_CHILD_MAX: return CHILD_MAX; case _SC_CLK_TCK: return SYSTEM_CLK_TCK; #ifdef _POSIX2_COLL_WEIGHTS_MASK case _SC_COLL_WEIGHTS_MAX: return _POSIX2_COLL_WEIGHTS_MASK; #endif #ifdef _POSIX2_EXPR_NEST_MAX case _SC_EXPR_NEST_MAX: return _POSIX2_EXPR_NEST_MAX; #endif #ifdef _POSIX2_LINE_MAX case _SC_LINE_MAX: return _POSIX2_LINE_MAX; #endif case _SC_NGROUPS_MAX: return NGROUPS_MAX; case _SC_OPEN_MAX: return OPEN_MAX; //case _SC_PASS_MAX: return PASS_MAX; case _SC_2_C_BIND: return SYSTEM_2_C_BIND; case _SC_2_C_DEV: return SYSTEM_2_C_DEV; case _SC_2_C_VERSION: return SYSTEM_2_C_VER; //case _SC_2_CHAR_TERM: return ; case _SC_2_FORT_DEV: return SYSTEM_2_FORT_DEV; case _SC_2_FORT_RUN: return SYSTEM_2_FORT_RUN; case _SC_2_LOCALEDEF: return SYSTEM_2_LOCALEDEF; case _SC_2_SW_DEV: return SYSTEM_2_SW_DEV; case _SC_2_UPE: return SYSTEM_2_UPE; case _SC_2_VERSION: return SYSTEM_2_VERSION; #ifdef _POSIX_JOB_CONTROL case _SC_JOB_CONTROL: return _POSIX_JOB_CONTROL; #endif #ifdef _POSIX_SAVED_IDS case _SC_SAVED_IDS: return _POSIX_SAVED_IDS; #endif #ifdef _POSIX_VERSION case _SC_VERSION: return _POSIX_VERSION; #endif //case _SC_RE_DUP_