1/* 2 * Copyright (C) 2008 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 <errno.h> 30#include <fcntl.h> 31#include <limits.h> 32#include <linux/uio.h> // For UIO_MAXIOV. 33#include <pthread.h> 34#include <stdio.h> // For FOPEN_MAX. 35#include <sys/auxv.h> 36#include <sys/resource.h> 37#include <sys/sysconf.h> 38#include <sys/sysinfo.h> 39#include <time.h> 40#include <unistd.h> 41 42#include "private/bionic_tls.h" 43 44static long __sysconf_rlimit(int resource) { 45 rlimit rl; 46 getrlimit(resource, &rl); 47 return rl.rlim_cur; 48} 49 50long sysconf(int name) { 51 switch (name) { 52 case _SC_ARG_MAX: return ARG_MAX; 53 case _SC_BC_BASE_MAX: return _POSIX2_BC_BASE_MAX; // Minimum requirement. 54 case _SC_BC_DIM_MAX: return _POSIX2_BC_DIM_MAX; // Minimum requirement. 55 case _SC_BC_SCALE_MAX: return _POSIX2_BC_SCALE_MAX; // Minimum requirement. 56 case _SC_BC_STRING_MAX: return _POSIX2_BC_STRING_MAX; // Minimum requirement. 57 case _SC_CHILD_MAX: return __sysconf_rlimit(RLIMIT_NPROC); 58 case _SC_CLK_TCK: return static_cast<long>(getauxval(AT_CLKTCK)); 59 case _SC_COLL_WEIGHTS_MAX: return _POSIX2_COLL_WEIGHTS_MAX; // Minimum requirement. 60 case _SC_EXPR_NEST_MAX: return _POSIX2_EXPR_NEST_MAX; // Minimum requirement. 61 case _SC_LINE_MAX: return _POSIX2_LINE_MAX; // Minimum requirement. 62 case _SC_NGROUPS_MAX: return NGROUPS_MAX; 63 case _SC_OPEN_MAX: return __sysconf_rlimit(RLIMIT_NOFILE); 64 case _SC_PASS_MAX: return PASS_MAX; 65 case _SC_2_C_BIND: return _POSIX2_C_BIND; 66 case _SC_2_C_DEV: return _POSIX2_C_DEV; 67 case _SC_2_CHAR_TERM: return _POSIX2_CHAR_TERM; 68 case _SC_2_FORT_DEV: return -1; 69 case _SC_2_FORT_RUN: return -1; 70 case _SC_2_LOCALEDEF: return _POSIX2_LOCALEDEF; 71 case _SC_2_SW_DEV: return _POSIX2_SW_DEV; 72 case _SC_2_UPE: return _POSIX2_UPE; 73 case _SC_2_VERSION: return _POSIX2_VERSION; 74 case _SC_JOB_CONTROL: return _POSIX_JOB_CONTROL; 75 case _SC_SAVED_IDS: return _POSIX_SAVED_IDS; 76 case _SC_VERSION: return _POSIX_VERSION; 77 case _SC_RE_DUP_MAX: return _POSIX_RE_DUP_MAX; // Minimum requirement. 78 case _SC_STREAM_MAX: return FOPEN_MAX; 79 case _SC_TZNAME_MAX: return _POSIX_TZNAME_MAX; // Minimum requirement. 80 case _SC_XOPEN_CRYPT: return _XOPEN_CRYPT; 81 case _SC_XOPEN_ENH_I18N: return _XOPEN_ENH_I18N; 82 case _SC_XOPEN_SHM: return _XOPEN_SHM; 83 case _SC_XOPEN_VERSION: return _XOPEN_VERSION; 84 case _SC_XOPEN_REALTIME: return _XOPEN_REALTIME; 85 case _SC_XOPEN_REALTIME_THREADS: return _XOPEN_REALTIME_THREADS; 86 case _SC_XOPEN_LEGACY: return _XOPEN_LEGACY; 87 case _SC_ATEXIT_MAX: return LONG_MAX; // Unlimited. 88 case _SC_IOV_MAX: return UIO_MAXIOV; 89 90 // _SC_PAGESIZE and _SC_PAGE_SIZE are distinct, but return the same value. 91 case _SC_PAGESIZE: 92 case _SC_PAGE_SIZE: 93 return static_cast<long>(getauxval(AT_PAGESZ)); 94 95 case _SC_XOPEN_UNIX: return _XOPEN_UNIX; 96 case _SC_AIO_LISTIO_MAX: return _POSIX_AIO_LISTIO_MAX; // Minimum requirement. 97 case _SC_AIO_MAX: return _POSIX_AIO_MAX; // Minimum requirement. 98 case _SC_AIO_PRIO_DELTA_MAX:return 0; // Minimum requirement. 99 case _SC_DELAYTIMER_MAX: return INT_MAX; 100 case _SC_MQ_OPEN_MAX: return _POSIX_MQ_OPEN_MAX; // Minimum requirement. 101 case _SC_MQ_PRIO_MAX: return _POSIX_MQ_PRIO_MAX; // Minimum requirement. 102 case _SC_RTSIG_MAX: return RTSIG_MAX; 103 case _SC_SEM_NSEMS_MAX: return _POSIX_SEM_NSEMS_MAX; // Minimum requirement. 104 case _SC_SEM_VALUE_MAX: return SEM_VALUE_MAX; 105 case _SC_SIGQUEUE_MAX: return _POSIX_SIGQUEUE_MAX; // Minimum requirement. 106 case _SC_TIMER_MAX: return _POSIX_TIMER_MAX; // Minimum requirement. 107 case _SC_ASYNCHRONOUS_IO: return _POSIX_ASYNCHRONOUS_IO; 108 case _SC_FSYNC: return _POSIX_FSYNC; 109 case _SC_MAPPED_FILES: return _POSIX_MAPPED_FILES; 110 case _SC_MEMLOCK: return _POSIX_MEMLOCK; 111 case _SC_MEMLOCK_RANGE: return _POSIX_MEMLOCK_RANGE; 112 case _SC_MEMORY_PROTECTION: return _POSIX_MEMORY_PROTECTION; 113 case _SC_MESSAGE_PASSING: return _POSIX_MESSAGE_PASSING; 114 case _SC_PRIORITIZED_IO: return _POSIX_PRIORITIZED_IO; 115 case _SC_PRIORITY_SCHEDULING: return _POSIX_PRIORITY_SCHEDULING; 116 case _SC_REALTIME_SIGNALS: return _POSIX_REALTIME_SIGNALS; 117 case _SC_SEMAPHORES: return _POSIX_SEMAPHORES; 118 case _SC_SHARED_MEMORY_OBJECTS: return _POSIX_SHARED_MEMORY_OBJECTS; 119 case _SC_SYNCHRONIZED_IO: return _POSIX_SYNCHRONIZED_IO; 120 case _SC_TIMERS: return _POSIX_TIMERS; 121 case _SC_GETGR_R_SIZE_MAX: return 1024; 122 case _SC_GETPW_R_SIZE_MAX: return 1024; 123 case _SC_LOGIN_NAME_MAX: return 256; // Seems default on linux. 124 case _SC_THREAD_DESTRUCTOR_ITERATIONS: return PTHREAD_DESTRUCTOR_ITERATIONS; 125 case _SC_THREAD_KEYS_MAX: return PTHREAD_KEYS_MAX; 126 case _SC_THREAD_STACK_MIN: return PTHREAD_STACK_MIN; 127 case _SC_THREAD_THREADS_MAX: return PTHREAD_THREADS_MAX; 128 case _SC_TTY_NAME_MAX: return 32; // Seems default on linux. 129 case _SC_THREADS: return _POSIX_THREADS; 130 case _SC_THREAD_ATTR_STACKADDR: return _POSIX_THREAD_ATTR_STACKADDR; 131 case _SC_THREAD_ATTR_STACKSIZE: return _POSIX_THREAD_ATTR_STACKSIZE; 132 case _SC_THREAD_PRIORITY_SCHEDULING: return _POSIX_THREAD_PRIORITY_SCHEDULING; 133 case _SC_THREAD_PRIO_INHERIT: return _POSIX_THREAD_PRIO_INHERIT; 134 case _SC_THREAD_PRIO_PROTECT: return _POSIX_THREAD_PRIO_PROTECT; 135 case _SC_THREAD_SAFE_FUNCTIONS: return _POSIX_THREAD_SAFE_FUNCTIONS; 136 case _SC_NPROCESSORS_CONF: return get_nprocs_conf(); 137 case _SC_NPROCESSORS_ONLN: return get_nprocs(); 138 case _SC_PHYS_PAGES: return get_phys_pages(); 139 case _SC_AVPHYS_PAGES: return get_avphys_pages(); 140 case _SC_MONOTONIC_CLOCK: return _POSIX_VERSION; 141 142 case _SC_2_PBS: return -1; // Obsolescent in POSIX.1-2008. 143 case _SC_2_PBS_ACCOUNTING: return -1; // Obsolescent in POSIX.1-2008. 144 case _SC_2_PBS_CHECKPOINT: return -1; // Obsolescent in POSIX.1-2008. 145 case _SC_2_PBS_LOCATE: return -1; // Obsolescent in POSIX.1-2008. 146 case _SC_2_PBS_MESSAGE: return -1; // Obsolescent in POSIX.1-2008. 147 case _SC_2_PBS_TRACK: return -1; // Obsolescent in POSIX.1-2008. 148 case _SC_ADVISORY_INFO: return _POSIX_ADVISORY_INFO; 149 case _SC_BARRIERS: return _POSIX_BARRIERS; 150 case _SC_CLOCK_SELECTION: return _POSIX_CLOCK_SELECTION; 151 case _SC_CPUTIME: return _POSIX_VERSION; 152 153 case _SC_HOST_NAME_MAX: return _POSIX_HOST_NAME_MAX; // Minimum requirement. 154 case _SC_IPV6: return _POSIX_IPV6; 155 case _SC_RAW_SOCKETS: return _POSIX_RAW_SOCKETS; 156 case _SC_READER_WRITER_LOCKS: return _POSIX_READER_WRITER_LOCKS; 157 case _SC_REGEXP: return _POSIX_REGEXP; 158 case _SC_SHELL: return _POSIX_SHELL; 159 case _SC_SPAWN: return _POSIX_SPAWN; 160 case _SC_SPIN_LOCKS: return _POSIX_SPIN_LOCKS; 161 case _SC_SPORADIC_SERVER: return _POSIX_SPORADIC_SERVER; 162 case _SC_SS_REPL_MAX: return -1; 163 case _SC_SYMLOOP_MAX: return _POSIX_SYMLOOP_MAX; // Minimum requirement. 164 case _SC_THREAD_CPUTIME: return _POSIX_VERSION; 165 166 case _SC_THREAD_PROCESS_SHARED: return _POSIX_THREAD_PROCESS_SHARED; 167 case _SC_THREAD_ROBUST_PRIO_INHERIT: return _POSIX_THREAD_ROBUST_PRIO_INHERIT; 168 case _SC_THREAD_ROBUST_PRIO_PROTECT: return _POSIX_THREAD_ROBUST_PRIO_PROTECT; 169 case _SC_THREAD_SPORADIC_SERVER: return _POSIX_THREAD_SPORADIC_SERVER; 170 case _SC_TIMEOUTS: return _POSIX_TIMEOUTS; 171 case _SC_TRACE: return -1; // Obsolescent in POSIX.1-2008. 172 case _SC_TRACE_EVENT_FILTER: return -1; // Obsolescent in POSIX.1-2008. 173 case _SC_TRACE_EVENT_NAME_MAX: return -1; 174 case _SC_TRACE_INHERIT: return -1; // Obsolescent in POSIX.1-2008. 175 case _SC_TRACE_LOG: return -1; // Obsolescent in POSIX.1-2008. 176 case _SC_TRACE_NAME_MAX: return -1; 177 case _SC_TRACE_SYS_MAX: return -1; 178 case _SC_TRACE_USER_EVENT_MAX: return -1; 179 case _SC_TYPED_MEMORY_OBJECTS: return _POSIX_TYPED_MEMORY_OBJECTS; 180 case _SC_V7_ILP32_OFF32: return _POSIX_V7_ILP32_OFF32; 181 case _SC_V7_ILP32_OFFBIG: return _POSIX_V7_ILP32_OFFBIG; 182 case _SC_V7_LP64_OFF64: return _POSIX_V7_LP64_OFF64; 183 case _SC_V7_LPBIG_OFFBIG: return _POSIX_V7_LPBIG_OFFBIG; 184 case _SC_XOPEN_STREAMS: return -1; // Obsolescent in POSIX.1-2008. 185 case _SC_XOPEN_UUCP: return -1; 186 187 // We do not have actual implementations for cache queries. 188 // It's valid to return 0 as the result is unknown. 189 case _SC_LEVEL1_ICACHE_SIZE: return 0; 190 case _SC_LEVEL1_ICACHE_ASSOC: return 0; 191 case _SC_LEVEL1_ICACHE_LINESIZE: return 0; 192 case _SC_LEVEL1_DCACHE_SIZE: return 0; 193 case _SC_LEVEL1_DCACHE_ASSOC: return 0; 194 case _SC_LEVEL1_DCACHE_LINESIZE: return 0; 195 case _SC_LEVEL2_CACHE_SIZE: return 0; 196 case _SC_LEVEL2_CACHE_ASSOC: return 0; 197 case _SC_LEVEL2_CACHE_LINESIZE: return 0; 198 case _SC_LEVEL3_CACHE_SIZE: return 0; 199 case _SC_LEVEL3_CACHE_ASSOC: return 0; 200 case _SC_LEVEL3_CACHE_LINESIZE: return 0; 201 case _SC_LEVEL4_CACHE_SIZE: return 0; 202 case _SC_LEVEL4_CACHE_ASSOC: return 0; 203 case _SC_LEVEL4_CACHE_LINESIZE: return 0; 204 205 default: 206 // Posix says EINVAL is the only error that shall be returned, 207 // but glibc uses ENOSYS. 208 errno = ENOSYS; 209 return -1; 210 } 211} 212