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review.blissroms.org / platform_bionic / 1c19194c9d2518dbe86973cd313a277ecb70d75c / . / libc / bionic / sysconf.cpp
blob: 67f48e7f3922b8685580b31c899f99c4c2e62f0d [file] [log] [blame]
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]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
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]29#include <errno.h>
30#include <fcntl.h>
31#include <limits.h>
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]32#include <linux/uio.h> // For UIO_MAXIOV.
Elliott Hughesc03e1e72013-07-29 16:51:45 -0700[diff] [blame]33#include <pthread.h>
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]34#include <stdio.h> // For FOPEN_MAX.
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]35#include <sys/auxv.h>
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]36#include <sys/sysconf.h>
Yabin Cui9d939862014-11-14 15:51:58 -0800[diff] [blame]37#include <sys/sysinfo.h>
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]38#include <time.h>
39#include <unistd.h>
40
Elliott Hugheseb847bc2013-10-09 15:50:50 -0700[diff] [blame]41#include "private/bionic_tls.h"
Elliott Hughes701bec22013-02-25 13:14:31 -0800[diff] [blame]42
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]43static int __sysconf_monotonic_clock() {
44 timespec t;
45 int rc = clock_getres(CLOCK_MONOTONIC, &t);
46 return (rc == -1) ? -1 : _POSIX_VERSION;
47}
48
Elliott Hughes60d84af2014-11-14 15:14:44 -0800[diff] [blame]49long sysconf(int name) {
Elliott Hughes04303f52014-09-18 16:11:59 -0700[diff] [blame]50 switch (name) {
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]51 case _SC_ARG_MAX: return ARG_MAX;
52 case _SC_BC_BASE_MAX: return _POSIX2_BC_BASE_MAX; // Minimum requirement.
53 case _SC_BC_DIM_MAX: return _POSIX2_BC_DIM_MAX; // Minimum requirement.
54 case _SC_BC_SCALE_MAX: return _POSIX2_BC_SCALE_MAX; // Minimum requirement.
55 case _SC_BC_STRING_MAX: return _POSIX2_BC_STRING_MAX; // Minimum requirement.
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]56 case _SC_CHILD_MAX: return CHILD_MAX;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]57 case _SC_CLK_TCK: return static_cast<long>(getauxval(AT_CLKTCK));
58 case _SC_COLL_WEIGHTS_MAX: return _POSIX2_COLL_WEIGHTS_MAX; // Minimum requirement.
59 case _SC_EXPR_NEST_MAX: return _POSIX2_EXPR_NEST_MAX; // Minimum requirement.
60 case _SC_LINE_MAX: return _POSIX2_LINE_MAX; // Minimum requirement.
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]61 case _SC_NGROUPS_MAX: return NGROUPS_MAX;
62 case _SC_OPEN_MAX: return OPEN_MAX;
Elliott Hughesa186b2e2014-09-22 14:49:07 -0700[diff] [blame]63 case _SC_PASS_MAX: return PASS_MAX;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]64 case _SC_2_C_BIND: return _POSIX2_C_BIND;
65 case _SC_2_C_DEV: return _POSIX2_C_DEV;
66 case _SC_2_CHAR_TERM: return _POSIX2_CHAR_TERM;
67 case _SC_2_FORT_DEV: return -1;
68 case _SC_2_FORT_RUN: return -1;
69 case _SC_2_LOCALEDEF: return _POSIX2_LOCALEDEF;
70 case _SC_2_SW_DEV: return _POSIX2_SW_DEV;
71 case _SC_2_UPE: return _POSIX2_UPE;
72 case _SC_2_VERSION: return _POSIX2_VERSION;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]73 case _SC_JOB_CONTROL: return _POSIX_JOB_CONTROL;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]74 case _SC_SAVED_IDS: return _POSIX_SAVED_IDS;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]75 case _SC_VERSION: return _POSIX_VERSION;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]76 case _SC_RE_DUP_MAX: return _POSIX_RE_DUP_MAX; // Minimum requirement.
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]77 case _SC_STREAM_MAX: return FOPEN_MAX;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]78 case _SC_TZNAME_MAX: return _POSIX_TZNAME_MAX; // Minimum requirement.
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]79 case _SC_XOPEN_CRYPT: return _XOPEN_CRYPT;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]80 case _SC_XOPEN_ENH_I18N: return _XOPEN_ENH_I18N;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]81 case _SC_XOPEN_SHM: return _XOPEN_SHM;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]82 case _SC_XOPEN_VERSION: return _XOPEN_VERSION;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]83 case _SC_XOPEN_REALTIME: return _XOPEN_REALTIME;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]84 case _SC_XOPEN_REALTIME_THREADS: return _XOPEN_REALTIME_THREADS;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]85 case _SC_XOPEN_LEGACY: return _XOPEN_LEGACY;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]86 case _SC_ATEXIT_MAX: return LONG_MAX; // Unlimited.
87 case _SC_IOV_MAX: return UIO_MAXIOV;
Elliott Hughes0e44bc32014-02-24 15:55:31 -0800[diff] [blame]88
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]89 case _SC_PAGESIZE: // Fall through, PAGESIZE and PAGE_SIZE always hold the same value.
90 case _SC_PAGE_SIZE: return PAGE_SIZE;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]91 case _SC_XOPEN_UNIX: return _XOPEN_UNIX;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]92 case _SC_AIO_LISTIO_MAX: return _POSIX_AIO_LISTIO_MAX; // Minimum requirement.
93 case _SC_AIO_MAX: return _POSIX_AIO_MAX; // Minimum requirement.
94 case _SC_AIO_PRIO_DELTA_MAX:return 0; // Minimum requirement.
95 case _SC_DELAYTIMER_MAX: return INT_MAX;
96 case _SC_MQ_OPEN_MAX: return _POSIX_MQ_OPEN_MAX; // Minimum requirement.
97 case _SC_MQ_PRIO_MAX: return _POSIX_MQ_PRIO_MAX; // Minimum requirement.
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]98 case _SC_RTSIG_MAX: return RTSIG_MAX;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]99 case _SC_SEM_NSEMS_MAX: return _POSIX_SEM_NSEMS_MAX; // Minimum requirement.
Elliott Hughes04303f52014-09-18 16:11:59 -0700[diff] [blame]100 case _SC_SEM_VALUE_MAX: return SEM_VALUE_MAX;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]101 case _SC_SIGQUEUE_MAX: return _POSIX_SIGQUEUE_MAX; // Minimum requirement.
102 case _SC_TIMER_MAX: return _POSIX_TIMER_MAX; // Minimum requirement.
103 case _SC_ASYNCHRONOUS_IO: return _POSIX_ASYNCHRONOUS_IO;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]104 case _SC_FSYNC: return _POSIX_FSYNC;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]105 case _SC_MAPPED_FILES: return _POSIX_MAPPED_FILES;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]106 case _SC_MEMLOCK: return _POSIX_MEMLOCK;
107 case _SC_MEMLOCK_RANGE: return _POSIX_MEMLOCK_RANGE;
108 case _SC_MEMORY_PROTECTION: return _POSIX_MEMORY_PROTECTION;
109 case _SC_MESSAGE_PASSING: return _POSIX_MESSAGE_PASSING;
110 case _SC_PRIORITIZED_IO: return _POSIX_PRIORITIZED_IO;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]111 case _SC_PRIORITY_SCHEDULING: return _POSIX_PRIORITY_SCHEDULING;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]112 case _SC_REALTIME_SIGNALS: return _POSIX_REALTIME_SIGNALS;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]113 case _SC_SEMAPHORES: return _POSIX_SEMAPHORES;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]114 case _SC_SHARED_MEMORY_OBJECTS: return _POSIX_SHARED_MEMORY_OBJECTS;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]115 case _SC_SYNCHRONIZED_IO: return _POSIX_SYNCHRONIZED_IO;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]116 case _SC_TIMERS: return _POSIX_TIMERS;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]117 case _SC_GETGR_R_SIZE_MAX: return 1024;
118 case _SC_GETPW_R_SIZE_MAX: return 1024;
119 case _SC_LOGIN_NAME_MAX: return 256; // Seems default on linux.
120 case _SC_THREAD_DESTRUCTOR_ITERATIONS: return PTHREAD_DESTRUCTOR_ITERATIONS;
121 case _SC_THREAD_KEYS_MAX: return PTHREAD_KEYS_MAX;
Elliott Hughesc03e1e72013-07-29 16:51:45 -0700[diff] [blame]122 case _SC_THREAD_STACK_MIN: return PTHREAD_STACK_MIN;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]123 case _SC_THREAD_THREADS_MAX: return PTHREAD_THREADS_MAX;
124 case _SC_TTY_NAME_MAX: return 32; // Seems default on linux.
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]125 case _SC_THREADS: return _POSIX_THREADS;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]126 case _SC_THREAD_ATTR_STACKADDR: return _POSIX_THREAD_ATTR_STACKADDR;
127 case _SC_THREAD_ATTR_STACKSIZE: return _POSIX_THREAD_ATTR_STACKSIZE;
128 case _SC_THREAD_PRIORITY_SCHEDULING: return _POSIX_THREAD_PRIORITY_SCHEDULING;
129 case _SC_THREAD_PRIO_INHERIT: return _POSIX_THREAD_PRIO_INHERIT;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]130 case _SC_THREAD_PRIO_PROTECT: return _POSIX_THREAD_PRIO_PROTECT;
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]131 case _SC_THREAD_SAFE_FUNCTIONS: return _POSIX_THREAD_SAFE_FUNCTIONS;
Yabin Cui9d939862014-11-14 15:51:58 -0800[diff] [blame]132 case _SC_NPROCESSORS_CONF: return get_nprocs_conf();
133 case _SC_NPROCESSORS_ONLN: return get_nprocs();
134 case _SC_PHYS_PAGES: return get_phys_pages();
135 case _SC_AVPHYS_PAGES: return get_avphys_pages();
Yabin Cui1c191942014-11-19 19:49:14 -0800[diff] [blame^]136 case _SC_MONOTONIC_CLOCK: return __sysconf_monotonic_clock();
137
138 case _SC_2_PBS: return -1; // Obsolescent in POSIX.1-2008.
139 case _SC_2_PBS_ACCOUNTING: return -1; // Obsolescent in POSIX.1-2008.
140 case _SC_2_PBS_CHECKPOINT: return -1; // Obsolescent in POSIX.1-2008.
141 case _SC_2_PBS_LOCATE: return -1; // Obsolescent in POSIX.1-2008.
142 case _SC_2_PBS_MESSAGE: return -1; // Obsolescent in POSIX.1-2008.
143 case _SC_2_PBS_TRACK: return -1; // Obsolescent in POSIX.1-2008.
144 case _SC_ADVISORY_INFO: return _POSIX_ADVISORY_INFO;
145 case _SC_BARRIERS: return _POSIX_BARRIERS;
146 case _SC_CLOCK_SELECTION: return _POSIX_CLOCK_SELECTION;
147 case _SC_CPUTIME: return _POSIX_CPUTIME;
148 case _SC_HOST_NAME_MAX: return _POSIX_HOST_NAME_MAX; // Minimum requirement.
149 case _SC_IPV6: return _POSIX_IPV6;
150 case _SC_RAW_SOCKETS: return _POSIX_RAW_SOCKETS;
151 case _SC_READER_WRITER_LOCKS: return _POSIX_READER_WRITER_LOCKS;
152 case _SC_REGEXP: return _POSIX_REGEXP;
153 case _SC_SHELL: return _POSIX_SHELL;
154 case _SC_SPAWN: return _POSIX_SPAWN;
155 case _SC_SPIN_LOCKS: return _POSIX_SPIN_LOCKS;
156 case _SC_SPORADIC_SERVER: return _POSIX_SPORADIC_SERVER;
157 case _SC_SS_REPL_MAX: return -1;
158 case _SC_SYMLOOP_MAX: return _POSIX_SYMLOOP_MAX; // Minimum requirement.
159 case _SC_THREAD_CPUTIME: return _POSIX_THREAD_CPUTIME;
160 case _SC_THREAD_PROCESS_SHARED: return _POSIX_THREAD_PROCESS_SHARED;
161 case _SC_THREAD_ROBUST_PRIO_INHERIT: return _POSIX_THREAD_ROBUST_PRIO_INHERIT;
162 case _SC_THREAD_ROBUST_PRIO_PROTECT: return _POSIX_THREAD_ROBUST_PRIO_PROTECT;
163 case _SC_THREAD_SPORADIC_SERVER: return _POSIX_THREAD_SPORADIC_SERVER;
164 case _SC_TIMEOUTS: return _POSIX_TIMEOUTS;
165 case _SC_TRACE: return -1; // Obsolescent in POSIX.1-2008.
166 case _SC_TRACE_EVENT_FILTER: return -1; // Obsolescent in POSIX.1-2008.
167 case _SC_TRACE_EVENT_NAME_MAX: return -1;
168 case _SC_TRACE_INHERIT: return -1; // Obsolescent in POSIX.1-2008.
169 case _SC_TRACE_LOG: return -1; // Obsolescent in POSIX.1-2008.
170 case _SC_TRACE_NAME_MAX: return -1;
171 case _SC_TRACE_SYS_MAX: return -1;
172 case _SC_TRACE_USER_EVENT_MAX: return -1;
173 case _SC_TYPED_MEMORY_OBJECTS: return _POSIX_TYPED_MEMORY_OBJECTS;
174 case _SC_V7_ILP32_OFF32: return _POSIX_V7_ILP32_OFF32;
175 case _SC_V7_ILP32_OFFBIG: return _POSIX_V7_ILP32_OFFBIG;
176 case _SC_V7_LP64_OFF64: return _POSIX_V7_LP64_OFF64;
177 case _SC_V7_LPBIG_OFFBIG: return _POSIX_V7_LPBIG_OFFBIG;
178 case _SC_XOPEN_STREAMS: return -1; // Obsolescent in POSIX.1-2008.
179 case _SC_XOPEN_UUCP: return -1;
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]180
181 default:
Elliott Hughes04303f52014-09-18 16:11:59 -0700[diff] [blame]182 // Posix says EINVAL is the only error that shall be returned,
183 // but glibc uses ENOSYS.
184 errno = ENOSYS;
185 return -1;
186 }
Elliott Hughesa55f6302013-01-02 14:23:43 -0800[diff] [blame]187}