# found at
# Standard: http://pubs.opengroup.org/onlinepubs/007904875/functions/sysconf.html
# Linux: OpenSuse 11.4, 2.6.37 kernel
# SCO: http://uw714doc.sco.com/en/man/html.3C/sysconf.3C.html
# Generic: http://cpansearch.perl.org/src/MHX/Convert-Binary-C-0.76/tests/include/include/bits/confname.h
# AIX: IBM base-ref
# FreeBSD: http://fxr.watson.org/fxr/source/gen/sysconf.c?v=FREEBSD-LIBC
# OpenSolaris: http://www.unix.com/man-page/OpenSolaris/3c/sysconf/
# MKS Windows: http://www.mkssoftware.com/docs/man3/sysconf.3.asp
# HP: http://www.docs.hp.com/en/B2355-90130/sysconf.2.html
_SC_2_C_BIND
_SC_2_C_CHAR_TERM
_SC_2_C_DEV
_SC_2_CHAR_TERM
_SC_2_C_VERSION
_SC_2_FORT_DEV
_SC_2_FORT_RUN
_SC_2_LOCALEDEF
_SC_2_PBS
_SC_2_PBS_ACCOUNTING
_SC_2_PBS_CHECKPOINT
_SC_2_PBS_LOCATE
_SC_2_PBS_MESSAGE
_SC_2_PBS_TRACK
_SC_2_SW_DEV
_SC_2_UPE
_SC_2_VERSION
_SC_ADVISORY_INFO
_SC_AES_OS_VERSION
_SC_AIO_LISTIO_MAX
_SC_AIO_MAX
_SC_AIO_PRIO_DELTA_MAX
_SC_AIX_HARDWARE_BITMODE
_SC_AIX_KERNEL_BITMODE
_SC_AIX_MP_CAPABLE
_SC_AIX_REALMEM
_SC_AIX_UKEYS
_SC_ARG_MAX
_SC_ASYNCHRONOUS_IO
_SC_ATEXIT_MAX
_SC_AVPHYS_PAGES
_SC_BARRIERS
_SC_BASE
_SC_BC_BASE_MAX
_SC_BC_DIM_MAX
_SC_BC_SCALE_MAX
_SC_BC_STRING_MAX
_SC_BD_DIM_MAX
_SC_CACHE_LINE
_SC_CG_SIMPLE_IMPL
_SC_CHAR_BIT
_SC_CHARCLASS_NAME_MAX
_SC_CHAR_MAX
_SC_CHAR_MIN
_SC_CHILD_MAX
_SC_C_LANG_SUPPORT
_SC_C_LANG_SUPPORT_R
_SC_CLK_TCK
_SC_CLOCK_SELECTION
_SC_CLOCKS_PER_SEC
_SC_COHER_BLKSZ
_SC_COLL_WEIGHTS_MAX
_SC_CPUID_MAX
_SC_CPU_KEYBITS1
_SC_CPUSET_SIZE
_SC_CPUTIME
_SC_CPU_VERSION
_SC_DCACHE_ASSOC
_SC_DCACHE_BLKSZ
_SC_DCACHE_LINESZ
_SC_DCACHE_SZ
_SC_DCACHE_TBLKSZ
_SC_DELAYTIMER_MAX
_SC_DEVICE_IO
_SC_DEVICE_SPECIFIC
_SC_DEVICE_SPECIFIC_R
_SC_EQUIV_CLASS_MAX
_SC_EXPR_NEST_MAX
_SC_FD_MGMT
_SC_FIFO
_SC_FILE_ATTRIBUTES
_SC_FILE_LOCKING
_SC_FILE_SYSTEM
_SC_FSYNC
_SC_GETGR_R_SIZE_MAX
_SC_GETPW_R_SIZE_MAX
_SCHAR_MAX
_SCHAR_MIN
_SCHEDULING
_SC_HOST_NAME_MAX
_SC_ICACHE_ASSOC
_SC_ICACHE_BLKSZ
_SC_ICACHE_LINESZ
_SC_ICACHE_SZ
_SC_INT_MAX
_SC_INT_MIN
_SC_IO_TYPE
_SC_IOV_MAX
_SC_IPV6
_SC_JOB_CONTROL
_SC_LARGE_PAGESIZE
_SC_LEVEL1_DCACHE_ASSOC
_SC_LEVEL1_DCACHE_LINESIZE
_SC_LEVEL1_DCACHE_SIZE
_SC_LEVEL1_ICACHE_ASSOC
_SC_LEVEL1_ICACHE_LINESIZE
_SC_LEVEL1_ICACHE_SIZE
_SC_LEVEL2_CACHE_ASSOC
_SC_LEVEL2_CACHE_LINESIZE
_SC_LEVEL2_CACHE_SIZE
_SC_LEVEL3_CACHE_ASSOC
_SC_LEVEL3_CACHE_LINESIZE
_SC_LEVEL3_CACHE_SIZE
_SC_LEVEL4_CACHE_ASSOC
_SC_LEVEL4_CACHE_LINESIZE
_SC_LEVEL4_CACHE_SIZE
_SC_LIBC_VERSION
_SC_LINE_MAX
_SC_LOGIN_NAME_MAX
_SC_LOGNAME_MAX
_SC_LONG_BIT
_SC_LPAR_ENABLED
_SC_MAPPED_FILES
_SC_MAX_CPUS_PER_CG
_SC_MAXPID
_SC_MB_LEN_MAX
_SC_MEMLOCK
_SC_MEMLOCK_RANGE
_SC_MEMORY_PROTECTION
_SC_MESSAGE_PASSING
_SC_MONOTONIC_CLOCK
_SC_MQ_OPEN_MAX
_SC_MQ_PRIO_MAX
_SC_MULTI_PROCESS
_SC_NACLS_MAX
_SC_NCGS_CONF
_SC_NCGS_ONLN
_SC_NETWORKING
_SC_NGROUPS_MAX
_SC_NL_ARGMAX
_SC_NL_LANGMAX
_SC_NL_MSGMAX
_SC_NL_NMAX
_SC_NL_SETMAX
_SC_NL_TEXTMAX
_SC_NPROCESSES
_SC_NPROCESSORS_CONF
_SC_NPROCESSORS_MAX
_SC_NPROCESSORS_ONLN
_SC_NUTC_OS_ALLOCGRANULARITY
_SC_NUTC_OS_PAGESIZE
_SC_NUTC_OS_PLATFORM
_SC_NZERO
_SC_OPEN_MAX
_SC_PAGESIZE
_SC_PAGE_SIZE
_SC_PAGESIZE
_SC_PASS_MAX
_SC_PHYS_PAGES
_SC_PII
_SC_PII_INTERNET
_SC_PII_INTERNET_DGRAM
_SC_PII_INTERNET_STREAM
_SC_PII_OSI
_SC_PII_OSI_CLTS
_SC_PII_OSI_COTS
_SC_PII_OSI_M
_SC_PII_SOCKET
_SC_PII_XTI
_SC_PIPE
_SC_POLL
_SC_PRIORITIZED_IO
_SC_PRIORITY_
_SC_PRIORITY_SCHEDULING
_SC_PROC_RSRC_MGR
_SC_RAW_SOCKETS
_SC_READER_WRITER_LOCKS
_SC_REALTIME_SIGNALS
_SC_RE_DUP_MAX
_SC_REENTRANT_FUNCTIONS
_SC_REGEXP
_SC_REGEX_VERSION
_SC_RTSIG_MAX
_SC_SAVED_IDS
_SC_SCHAR_MAX
_SC_SCHAR_MIN
_SC_SECURITY_CLASS
_SC_SELECT
_SC_SEMAPHORES
_SC_SEM_NSEMS_MAX
_SC_SEM_VALUE_MAX
_SC_SHARED_MEMORY_
_SC_SHARED_MEMORY_OBJECTS
_SC_SHELL
_SC_SHRT_MAX
_SC_SHRT_MIN
_SC_SIGNALS
_SC_SIGQUEUE_MAX
_SC_SINGLE_PROCESS
_SC_SPAWN
_SC_SPIN_LOCKS
_SC_SPLIT_CACHE
_SC_SPORADIC_SERVER
_SC_SSIZE_MAX
_SC_SS_REPL_MAX
_SC_STACK_PROT
_SC_STREAM_MAX
_SC_STREAMS
_SC_SYMLOOP_MAX
_SC_SYNCHRONIZED_IO
_SC_SYSTEM_DATABASE
_SC_SYSTEM_DATABASE_R
_SC_SYSTEM_ID
_SC_THREAD_
_SC_THREAD_ATTR_
_SC_THREAD_ATTR_STACKADDR
_SC_THREAD_ATTR_STACKSIZE
_SC_THREAD_CPUTIME
_SC_THREAD_DATAKEYS_MAX
_SC_THREAD_DESTRUCTOR_
_SC_THREAD_DESTRUCTOR_ITERATIONS
_SC_THREAD_KEYS_MAX
_SC_THREAD_PRIO_
_SC_THREAD_PRIO_INHERIT
_SC_THREAD_PRIO_PROTECT
_SC_THREAD_PRIORITY_
_SC_THREAD_PRIORITY_SCHEDULING
_SC_THREAD_PROCESS_
_SC_THREAD_PROCESS_SHARED
_SC_THREAD_ROBUST_PRIO_INHERIT
_SC_THREAD_ROBUST_PRIO_PROTECT
_SC_THREADS
_SC_THREAD_SAFE_
_SC_THREAD_SAFE_FUNCTIONS
_SC_THREAD_SPORADIC_SERVER
_SC_THREAD_STACK_MIN
_SC_THREAD_THREADS_MAX
_SC_TIMEOUTS
_SC_TIMER_MAX
_SC_TIMERS
_SC_T_IOV_MAX
_SC_TRACE
_SC_TRACE_EVENT_FILTER
_SC_TRACE_EVENT_NAME_MAX
_SC_TRACE_INHERIT
_SC_TRACE_LOG
_SC_TRACE_NAME_MAX
_SC_TRACE_SYS_MAX
_SC_TRACE_USER_EVENT_MAX
_SC_TTY_NAME_MAX
_SC_TYPED_MEMORY_OBJECTS
_SC_TZNAME_MAX
_SC_UCHAR_MAX
_SC_UINT_MAX
_SC_UIO_MAXIOV
_SC_ULONG_MAX
_SC_USER_GROUPS
_SC_USER_GROUPS_R
_SC_USHRT_MAX
_SC_V6_ILP32_OFF32
_SC_V6_ILP32_OFFBIG
_SC_V6_LP64_OFF64
_SC_V6_LPBIG_OFFBIG
_SC_V7_ILP32_OFF32
_SC_V7_ILP32_OFFBIG
_SC_V7_LP64_OFF64
_SC_V7_LPBIG_OFFBIG
_SC_VERSION
_SC_WORD_BIT
_SC_XBS5_ILP32_OFF32
_SC_XBS5_ILP32_OFFBIG
_SC_XBS5_LP64_OFF64
_SC_XBS5_LPBIG_OFFBIG
_SC_XOPEN_CRYPT
_SC_XOPEN_ENH_I18N
_SC_XOPEN_LEGACY
_SC_XOPEN_REALTIME
_SC_XOPEN_REALTIME_
_SC_XOPEN_REALTIME_THREADS
_SC_XOPEN_SHM
_SC_XOPEN_STREAMS
_SC_XOPEN_UNIX
_SC_XOPEN_VERSION
_SC_XOPEN_XCU_VERSION
_SC_XOPEN_XPG
_SC_XOPEN_XPG2
_SC_XOPEN_XPG3
_SC_XOPEN_XPG4