+++ /dev/null
-/*
- * 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 <stdbool.h>
-#include <stdio.h> // For FOPEN_MAX.
-#include <string.h>
-#include <sys/sysconf.h>
-#include <unistd.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_KEYS_MAX BIONIC_TLS_SLOTS
-#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 __get_nproc_conf(void) {
- // On x86 kernels you can use /proc/cpuinfo for this, but on ARM kernels offline CPUs disappear
- // from there. This method works on both.
- DIR* d = opendir("/sys/devices/system/cpu");
- if (!d) {
- return 1;
- }
-
- int result = 0;
- struct dirent* e;
- while ((e = readdir(d)) != NULL) {
- if (e->d_type == DT_DIR && __matches_cpuN(e->d_name)) {
- ++result;
- }
- }
- closedir(d);
- return result;
-}
-
-static int __get_nproc_onln(void) {
- 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 __get_phys_pages(void) {
- return __get_meminfo("MemTotal: %ld kB");
-}
-
-static int __get_avphys_pages(void) {
- return __get_meminfo("MemFree: %ld kB");
-}
-
-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;
-#ifdef _POSIX_THREAD_DESTRUCTOR_ITERATIONS
- case _SC_THREAD_DESTRUCTOR_ITERATIONS: return _POSIX_THREAD_DESTRUCTOR_ITERATIONS;
-#endif
- case _SC_THREAD_KEYS_MAX: return SYSTEM_THREAD_KEYS_MAX;
- 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_NPROCESSORS_CONF: return __get_nproc_conf();
- case _SC_NPROCESSORS_ONLN: return __get_nproc_onln();
- case _SC_PHYS_PAGES: return __get_phys_pages();
- case _SC_AVPHYS_PAGES: return __get_avphys_pages();
-
- default:
- /* Posix says EINVAL is the only error that shall be returned,
- * but GLibc uses ENOSYS */
- errno = ENOSYS;
- return -1;
- }
-}
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