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platform_bionic/libc/bionic/sysconf.cpp
Elliott Hughes baed51ee3a Change ARG_MAX/_SC_ARG_MAX back to a constant. 
As per the lkml thread https://lkml.org/lkml/2017/11/1/946.

Bug: http://b/65818597
Test: ran tests
Change-Id: I7a0610e6903e6761f2b31416e2f5017bd7a60659
2017-11-15 15:14:35 -08:00

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/*
* 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 <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pthread.h>
#include <stdio.h> // For FOPEN_MAX.
#include <sys/auxv.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/sysinfo.h>
#include <time.h>
#include <unistd.h>
#include "private/bionic_tls.h"
static long __sysconf_rlimit(int resource) {
rlimit rl;
getrlimit(resource, &rl);
return rl.rlim_cur;
}
long sysconf(int name) {
switch (name) {
//
// Things we actually have to calculate...
//
case _SC_ARG_MAX:
// https://lkml.org/lkml/2017/11/15/813...
//
// I suspect a 128kB sysconf(_SC_ARG_MAX) is the sanest bet, simply
// because of that "conservative is better than aggressive".
//
// Especially since _technically_ we're still limiting things to that
// 128kB due to the single-string limit.
//
// Linus
return ARG_MAX;
case _SC_AVPHYS_PAGES: return get_avphys_pages();
case _SC_CHILD_MAX: return __sysconf_rlimit(RLIMIT_NPROC);
case _SC_CLK_TCK: return static_cast<long>(getauxval(AT_CLKTCK));
case _SC_NPROCESSORS_CONF: return get_nprocs_conf();
case _SC_NPROCESSORS_ONLN: return get_nprocs();
case _SC_OPEN_MAX: return __sysconf_rlimit(RLIMIT_NOFILE);
case _SC_PAGESIZE:
case _SC_PAGE_SIZE:
// _SC_PAGESIZE and _SC_PAGE_SIZE are distinct, but return the same value.
return static_cast<long>(getauxval(AT_PAGESZ));
case _SC_PHYS_PAGES: return get_phys_pages();
//
// Constants...
//
case _SC_BC_BASE_MAX: return _POSIX2_BC_BASE_MAX; // Minimum requirement.
case _SC_BC_DIM_MAX: return _POSIX2_BC_DIM_MAX; // Minimum requirement.
case _SC_BC_SCALE_MAX: return _POSIX2_BC_SCALE_MAX; // Minimum requirement.
case _SC_BC_STRING_MAX: return _POSIX2_BC_STRING_MAX; // Minimum requirement.
case _SC_COLL_WEIGHTS_MAX: return _POSIX2_COLL_WEIGHTS_MAX; // Minimum requirement.
case _SC_EXPR_NEST_MAX: return _POSIX2_EXPR_NEST_MAX; // Minimum requirement.
case _SC_LINE_MAX: return _POSIX2_LINE_MAX; // Minimum requirement.
case _SC_NGROUPS_MAX: return NGROUPS_MAX;
case _SC_PASS_MAX: return PASS_MAX;
case _SC_2_C_BIND: return _POSIX2_C_BIND;
case _SC_2_C_DEV: return _POSIX2_C_DEV;
case _SC_2_CHAR_TERM: return _POSIX2_CHAR_TERM;
case _SC_2_FORT_DEV: return -1;
case _SC_2_FORT_RUN: return -1;
case _SC_2_LOCALEDEF: return _POSIX2_LOCALEDEF;
case _SC_2_SW_DEV: return _POSIX2_SW_DEV;
case _SC_2_UPE: return _POSIX2_UPE;
case _SC_2_VERSION: return _POSIX2_VERSION;
case _SC_JOB_CONTROL: return _POSIX_JOB_CONTROL;
case _SC_SAVED_IDS: return _POSIX_SAVED_IDS;
case _SC_VERSION: return _POSIX_VERSION;
case _SC_RE_DUP_MAX: return _POSIX_RE_DUP_MAX; // Minimum requirement.
case _SC_STREAM_MAX: return FOPEN_MAX;
case _SC_TZNAME_MAX: return _POSIX_TZNAME_MAX; // Minimum requirement.
case _SC_XOPEN_CRYPT: return _XOPEN_CRYPT;
case _SC_XOPEN_ENH_I18N: return _XOPEN_ENH_I18N;
case _SC_XOPEN_SHM: return _XOPEN_SHM;
case _SC_XOPEN_VERSION: return _XOPEN_VERSION;
case _SC_XOPEN_REALTIME: return _XOPEN_REALTIME;
case _SC_XOPEN_REALTIME_THREADS: return _XOPEN_REALTIME_THREADS;
case _SC_XOPEN_LEGACY: return _XOPEN_LEGACY;
case _SC_ATEXIT_MAX: return LONG_MAX; // Unlimited.
case _SC_IOV_MAX: return IOV_MAX;
case _SC_XOPEN_UNIX: return _XOPEN_UNIX;
case _SC_AIO_LISTIO_MAX: return _POSIX_AIO_LISTIO_MAX; // Minimum requirement.
case _SC_AIO_MAX: return _POSIX_AIO_MAX; // Minimum requirement.
case _SC_AIO_PRIO_DELTA_MAX:return 0; // Minimum requirement.
case _SC_DELAYTIMER_MAX: return INT_MAX;
case _SC_MQ_OPEN_MAX: return _POSIX_MQ_OPEN_MAX; // Minimum requirement.
case _SC_MQ_PRIO_MAX: return _POSIX_MQ_PRIO_MAX; // Minimum requirement.
case _SC_RTSIG_MAX: return RTSIG_MAX;
case _SC_SEM_NSEMS_MAX: return _POSIX_SEM_NSEMS_MAX; // Minimum requirement.
case _SC_SEM_VALUE_MAX: return SEM_VALUE_MAX;
case _SC_SIGQUEUE_MAX: return _POSIX_SIGQUEUE_MAX; // Minimum requirement.
case _SC_TIMER_MAX: return _POSIX_TIMER_MAX; // Minimum requirement.
case _SC_ASYNCHRONOUS_IO: return _POSIX_ASYNCHRONOUS_IO;
case _SC_FSYNC: return _POSIX_FSYNC;
case _SC_MAPPED_FILES: return _POSIX_MAPPED_FILES;
case _SC_MEMLOCK: return _POSIX_MEMLOCK;
case _SC_MEMLOCK_RANGE: return _POSIX_MEMLOCK_RANGE;
case _SC_MEMORY_PROTECTION: return _POSIX_MEMORY_PROTECTION;
case _SC_MESSAGE_PASSING: return _POSIX_MESSAGE_PASSING;
case _SC_PRIORITIZED_IO: return _POSIX_PRIORITIZED_IO;
case _SC_PRIORITY_SCHEDULING: return _POSIX_PRIORITY_SCHEDULING;
case _SC_REALTIME_SIGNALS: return _POSIX_REALTIME_SIGNALS;
case _SC_SEMAPHORES: return _POSIX_SEMAPHORES;
case _SC_SHARED_MEMORY_OBJECTS: return _POSIX_SHARED_MEMORY_OBJECTS;
case _SC_SYNCHRONIZED_IO: return _POSIX_SYNCHRONIZED_IO;
case _SC_TIMERS: return _POSIX_TIMERS;
case _SC_GETGR_R_SIZE_MAX: return 1024;
case _SC_GETPW_R_SIZE_MAX: return 1024;
case _SC_LOGIN_NAME_MAX: return LOGIN_NAME_MAX;
case _SC_THREAD_DESTRUCTOR_ITERATIONS: return PTHREAD_DESTRUCTOR_ITERATIONS;
case _SC_THREAD_KEYS_MAX: return PTHREAD_KEYS_MAX;
case _SC_THREAD_STACK_MIN: return PTHREAD_STACK_MIN;
case _SC_THREAD_THREADS_MAX: return -1; // No specific limit.
case _SC_TTY_NAME_MAX: return TTY_NAME_MAX;
case _SC_THREADS: return _POSIX_THREADS;
case _SC_THREAD_ATTR_STACKADDR: return _POSIX_THREAD_ATTR_STACKADDR;
case _SC_THREAD_ATTR_STACKSIZE: return _POSIX_THREAD_ATTR_STACKSIZE;
case _SC_THREAD_PRIORITY_SCHEDULING: return _POSIX_THREAD_PRIORITY_SCHEDULING;
case _SC_THREAD_PRIO_INHERIT: return _POSIX_THREAD_PRIO_INHERIT;
case _SC_THREAD_PRIO_PROTECT: return _POSIX_THREAD_PRIO_PROTECT;
case _SC_THREAD_SAFE_FUNCTIONS: return _POSIX_THREAD_SAFE_FUNCTIONS;
case _SC_MONOTONIC_CLOCK: return _POSIX_MONOTONIC_CLOCK;
case _SC_2_PBS: return -1; // Obsolescent in POSIX.1-2008.
case _SC_2_PBS_ACCOUNTING: return -1; // Obsolescent in POSIX.1-2008.
case _SC_2_PBS_CHECKPOINT: return -1; // Obsolescent in POSIX.1-2008.
case _SC_2_PBS_LOCATE: return -1; // Obsolescent in POSIX.1-2008.
case _SC_2_PBS_MESSAGE: return -1; // Obsolescent in POSIX.1-2008.
case _SC_2_PBS_TRACK: return -1; // Obsolescent in POSIX.1-2008.
case _SC_ADVISORY_INFO: return _POSIX_ADVISORY_INFO;
case _SC_BARRIERS: return _POSIX_BARRIERS;
case _SC_CLOCK_SELECTION: return _POSIX_CLOCK_SELECTION;
case _SC_CPUTIME: return _POSIX_CPUTIME;
case _SC_HOST_NAME_MAX: return _POSIX_HOST_NAME_MAX; // Minimum requirement.
case _SC_IPV6: return _POSIX_IPV6;
case _SC_RAW_SOCKETS: return _POSIX_RAW_SOCKETS;
case _SC_READER_WRITER_LOCKS: return _POSIX_READER_WRITER_LOCKS;
case _SC_REGEXP: return _POSIX_REGEXP;
case _SC_SHELL: return _POSIX_SHELL;
case _SC_SPAWN: return _POSIX_SPAWN;
case _SC_SPIN_LOCKS: return _POSIX_SPIN_LOCKS;
case _SC_SPORADIC_SERVER: return _POSIX_SPORADIC_SERVER;
case _SC_SS_REPL_MAX: return -1;
case _SC_SYMLOOP_MAX: return _POSIX_SYMLOOP_MAX; // Minimum requirement.
case _SC_THREAD_CPUTIME: return _POSIX_THREAD_CPUTIME;
case _SC_THREAD_PROCESS_SHARED: return _POSIX_THREAD_PROCESS_SHARED;
case _SC_THREAD_ROBUST_PRIO_INHERIT: return _POSIX_THREAD_ROBUST_PRIO_INHERIT;
case _SC_THREAD_ROBUST_PRIO_PROTECT: return _POSIX_THREAD_ROBUST_PRIO_PROTECT;
case _SC_THREAD_SPORADIC_SERVER: return _POSIX_THREAD_SPORADIC_SERVER;
case _SC_TIMEOUTS: return _POSIX_TIMEOUTS;
case _SC_TRACE: return -1; // Obsolescent in POSIX.1-2008.
case _SC_TRACE_EVENT_FILTER: return -1; // Obsolescent in POSIX.1-2008.
case _SC_TRACE_EVENT_NAME_MAX: return -1;
case _SC_TRACE_INHERIT: return -1; // Obsolescent in POSIX.1-2008.
case _SC_TRACE_LOG: return -1; // Obsolescent in POSIX.1-2008.
case _SC_TRACE_NAME_MAX: return -1;
case _SC_TRACE_SYS_MAX: return -1;
case _SC_TRACE_USER_EVENT_MAX: return -1;
case _SC_TYPED_MEMORY_OBJECTS: return _POSIX_TYPED_MEMORY_OBJECTS;
case _SC_V7_ILP32_OFF32: return _POSIX_V7_ILP32_OFF32;
case _SC_V7_ILP32_OFFBIG: return _POSIX_V7_ILP32_OFFBIG;
case _SC_V7_LP64_OFF64: return _POSIX_V7_LP64_OFF64;
case _SC_V7_LPBIG_OFFBIG: return _POSIX_V7_LPBIG_OFFBIG;
case _SC_XOPEN_STREAMS: return -1; // Obsolescent in POSIX.1-2008.
case _SC_XOPEN_UUCP: return -1;
// We do not have actual implementations for cache queries.
// It's valid to return 0 as the result is unknown.
case _SC_LEVEL1_ICACHE_SIZE: return 0;
case _SC_LEVEL1_ICACHE_ASSOC: return 0;
case _SC_LEVEL1_ICACHE_LINESIZE: return 0;
case _SC_LEVEL1_DCACHE_SIZE: return 0;
case _SC_LEVEL1_DCACHE_ASSOC: return 0;
case _SC_LEVEL1_DCACHE_LINESIZE: return 0;
case _SC_LEVEL2_CACHE_SIZE: return 0;
case _SC_LEVEL2_CACHE_ASSOC: return 0;
case _SC_LEVEL2_CACHE_LINESIZE: return 0;
case _SC_LEVEL3_CACHE_SIZE: return 0;
case _SC_LEVEL3_CACHE_ASSOC: return 0;
case _SC_LEVEL3_CACHE_LINESIZE: return 0;
case _SC_LEVEL4_CACHE_SIZE: return 0;
case _SC_LEVEL4_CACHE_ASSOC: return 0;
case _SC_LEVEL4_CACHE_LINESIZE: return 0;
default:
// Posix says EINVAL is the only error that shall be returned,
// but glibc uses ENOSYS.
errno = ENOSYS;
return -1;
}
}
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