| /* |
| * 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 <asm/page.h> |
| #include <bionic_tls.h> |
| #include <ctype.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <limits.h> |
| #include <stdio.h> // For FOPEN_MAX. |
| #include <string.h> |
| #include <sys/sysconf.h> |
| #include <time.h> |
| #include <unistd.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_STACK_MIN 32768 /* lower values may be possible, but be conservative */ |
| #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_<AX: return ; |
| case _SC_STREAM_MAX: return FOPEN_MAX; |
| //case _SC_TZNAME_MAX: return ; |
| #if _XOPEN_CRYPT |
| case _SC_XOPEN_CRYPT: return _XOPEN_CRYPT; |
| #endif |
| #ifdef _XOPEN_ENH_I18N |
| case _SC_XOPEN_ENH_I18N: return _XOPEN_ENH_I18N; |
| #endif |
| #ifdef _XOPEN_SHM |
| case _SC_XOPEN_SHM: return _XOPEN_SHM; |
| #endif |
| #ifdef _XOPEN_VERSION |
| case _SC_XOPEN_VERSION: return _XOPEN_VERSION; |
| #endif |
| #ifdef _XOPEN_XCU_VERSION |
| case _SC_XOPEN_XCU_VERSION: return _XOPEN_XCU_VERSION; |
| #endif |
| #ifdef _XOPEN_REALTIME |
| case _SC_XOPEN_REALTIME: return _XOPEN_REALTIME; |
| #endif |
| #ifdef _XOPEN_REALTIME_THREADS |
| case _SC_XOPEN_REALTIME_THREADS: return _XOPEN_REALTIME_THREADS; |
| #endif |
| #ifdef _XOPEN_LEGACY |
| case _SC_XOPEN_LEGACY: return _XOPEN_LEGACY; |
| #endif |
| case _SC_ATEXIT_MAX: return SYSTEM_ATEXIT_MAX; |
| case _SC_IOV_MAX: return SYSTEM_IOV_MAX; |
| case _SC_PAGESIZE: return PAGE_SIZE; |
| case _SC_PAGE_SIZE: return PAGE_SIZE; |
| #ifdef _XOPEN_UNIX |
| case _SC_XOPEN_UNIX: return _XOPEN_UNIX; |
| #endif |
| |
| // XXX: TODO: XBS5 nonsense |
| |
| #ifdef AIO_LISTIO_MAX |
| case _SC_AIO_LISTIO_MAX: return AIO_LISTIO_MAX; |
| #endif |
| #ifdef AIO_MAX |
| case _SC_AIO_MAX: return AIO_MAX; |
| #endif |
| #ifdef AIO_PRIO_DELTA_MAX |
| case _SC_AIO_PRIO_DELTA_MAX: return AIO_PRIO_DELTA_MAX; |
| #endif |
| case _SC_DELAYTIMER_MAX: return SYSTEM_DELAYTIMER_MAX; |
| case _SC_MQ_OPEN_MAX: return SYSTEM_MQ_OPEN_MAX; |
| case _SC_MQ_PRIO_MAX: return SYSTEM_MQ_PRIO_MAX; |
| case _SC_RTSIG_MAX: return RTSIG_MAX; |
| case _SC_SEM_NSEMS_MAX: return SYSTEM_SEM_NSEMS_MAX; |
| case _SC_SEM_VALUE_MAX: return SYSTEM_SEM_VALUE_MAX; |
| case _SC_SIGQUEUE_MAX: return SYSTEM_SIGQUEUE_MAX; |
| case _SC_TIMER_MAX: return SYSTEM_TIMER_MAX; |
| #ifdef _POSIX_ASYNCHRONOUS_IO |
| case _SC_ASYNCHRONOUS_IO: return _POSIX_ASYNCHRONOUS_IO; |
| #endif |
| #ifdef _POSIX_FSYNC |
| case _SC_FSYNC: return _POSIX_FSYNC; |
| #endif |
| #ifdef _POSIX_MAPPED_FILES |
| case _SC_MAPPED_FILES: return _POSIX_MAPPED_FILES; |
| #endif |
| #ifdef _POSIX_MEMLOCK |
| case _SC_MEMLOCK: return _POSIX_MEMLOCK; |
| #endif |
| #ifdef _POSIX_MEMLOCK_RANGE |
| case _SC_MEMLOCK_RANGE: return _POSIX_MEMLOCK_RANGE |
| #endif |
| #ifdef _POSIX_MEMORY_PROTECTION |
| case _SC_MEMORY_PROTECTION: return _POSIX_MEMORY_PROTECTION; |
| #endif |
| #ifdef _POSIX_MESSAGE_PASSING |
| case _SC_MESSAGE_PASSING: return _POSIX_MESSAGE_PASSING; |
| #endif |
| #ifdef _POSIX_PRIORITIZED_IO |
| case _SC_PRIORITIZED_IO: return _POSIX_PRIORITIZED_IO; |
| #endif |
| #ifdef _POSIX_PRIORITY_SCHEDULING |
| case _SC_PRIORITY_SCHEDULING: return _POSIX_PRIORITY_SCHEDULING; |
| #endif |
| #ifdef _POSIX_REALTIME_SIGNALS |
| case _SC_REALTIME_SIGNALS: return _POSIX_REALTIME_SIGNALS; |
| #endif |
| #ifdef _POSIX_SEMAPHORES |
| case _SC_SEMAPHORES: return _POSIX_SEMAPHORES; |
| #endif |
| #ifdef _POSIX_SHARED_MEMORY_OBJECTS |
| case _SC_SHARED_MEMORY_OBJECTS: return _POSIX_SHARED_MEMORY_OBJECTS; |
| #endif |
| #ifdef _POSIX_SYNCHRONIZED_IO |
| case _SC_SYNCHRONIZED_IO: return _POSIX_SYNCHRONIZED_IO; |
| #endif |
| #ifdef _POSIX_TIMERS |
| case _SC_TIMERS: return _POSIX_TIMERS; |
| #endif |
| |
| // GETGR_R_SIZE_MAX ? |
| // GETPW_R_SIZE_MAX ? |
| |
| case _SC_LOGIN_NAME_MAX: return SYSTEM_LOGIN_NAME_MAX; |
| |
| case _SC_THREAD_DESTRUCTOR_ITERATIONS: |
| return _POSIX_THREAD_DESTRUCTOR_ITERATIONS; |
| |
| case _SC_THREAD_KEYS_MAX: |
| return (BIONIC_TLS_SLOTS - TLS_SLOT_FIRST_USER_SLOT - GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT); |
| |
| case _SC_THREAD_STACK_MIN: return SYSTEM_THREAD_STACK_MIN; |
| case _SC_THREAD_THREADS_MAX: return SYSTEM_THREAD_THREADS_MAX; |
| case _SC_TTY_NAME_MAX: return SYSTEM_TTY_NAME_MAX; |
| #ifdef _POSIX_THREADS |
| case _SC_THREADS: return _POSIX_THREADS; |
| #endif |
| #ifdef _POSIX_THREAD_ATTR_STACKADDR |
| case _SC_THREAD_ATTR_STACKADDR: return _POSIX_THREAD_ATTR_STACKADDR; |
| #endif |
| #ifdef _POSIX_THREAD_ATTR_STACKSIZE |
| case _SC_THREAD_ATTR_STACKSIZE: return _POSIX_THREAD_ATTR_STACKSIZE; |
| #endif |
| #ifdef _POSIX_THREAD_PRIORITY_SCHEDULING |
| case _SC_THREAD_PRIORITY_SCHEDULING: return _POSIX_THREAD_PRIORITY_SCHEDULING; |
| #endif |
| #ifdef _POSIX_THREAD_PRIO_INHERIT |
| case _SC_THREAD_PRIO_INHERIT: return _POSIX_THREAD_PRIO_INHERIT; |
| #endif |
| #ifdef _POSIX_THREAD_PRIO_PROTECT |
| case _SC_THREAD_PRIO_PROTECT: return _POSIX_THREAD_PRIO_PROTECT; |
| #endif |
| #ifdef _POSIX_THREAD_SAFE_FUNCTIONS |
| case _SC_THREAD_SAFE_FUNCTIONS: return _POSIX_THREAD_SAFE_FUNCTIONS |
| #endif |
| |
| case _SC_MONOTONIC_CLOCK: return __sysconf_monotonic_clock(); |
| case _SC_NPROCESSORS_CONF: return __sysconf_nprocessors_conf(); |
| case _SC_NPROCESSORS_ONLN: return __sysconf_nprocessors_onln(); |
| case _SC_PHYS_PAGES: return __sysconf_phys_pages(); |
| case _SC_AVPHYS_PAGES: return __sysconf_avphys_pages(); |
| |
| default: |
| /* Posix says EINVAL is the only error that shall be returned, |
| * but GLibc uses ENOSYS */ |
| errno = ENOSYS; |
| return -1; |
| } |
| } |
