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Here are the symbolic constants for use as the parameter argument
to sysconf
. The values are all integer constants (more
specifically, enumeration type values).
_SC_ARG_MAX
-
Inquire about the parameter corresponding to
ARG_MAX
.
_SC_CHILD_MAX
-
Inquire about the parameter corresponding to
CHILD_MAX
.
_SC_OPEN_MAX
-
Inquire about the parameter corresponding to
OPEN_MAX
.
_SC_STREAM_MAX
-
Inquire about the parameter corresponding to
STREAM_MAX
.
_SC_TZNAME_MAX
-
Inquire about the parameter corresponding to
TZNAME_MAX
.
_SC_NGROUPS_MAX
-
Inquire about the parameter corresponding to
NGROUPS_MAX
.
_SC_JOB_CONTROL
-
Inquire about the parameter corresponding to
_POSIX_JOB_CONTROL
.
_SC_SAVED_IDS
-
Inquire about the parameter corresponding to
_POSIX_SAVED_IDS
.
_SC_VERSION
-
Inquire about the parameter corresponding to
_POSIX_VERSION
.
_SC_CLK_TCK
-
Inquire about the parameter corresponding to
CLOCKS_PER_SEC
;
see section CPU Time Inquiry.
_SC_CHARCLASS_NAME_MAX
-
Inquire about the parameter corresponding to maximal length allowed for
a character class name in an extended locale specification. These
extensions are not yet standardized and so this option is not standardized
as well.
_SC_REALTIME_SIGNALS
-
Inquire about the parameter corresponding to
_POSIX_REALTIME_SIGNALS
.
_SC_PRIORITY_SCHEDULING
-
Inquire about the parameter corresponding to
_POSIX_PRIORITY_SCHEDULING
.
_SC_TIMERS
-
Inquire about the parameter corresponding to
_POSIX_TIMERS
.
_SC_ASYNCHRONOUS_IO
-
Inquire about the parameter corresponding to
_POSIX_ASYNCHRONOUS_IO
.
_SC_PRIORITIZED_IO
-
Inquire about the parameter corresponding to
_POSIX_PRIORITIZED_IO
.
_SC_SYNCHRONIZED_IO
-
Inquire about the parameter corresponding to
_POSIX_SYNCHRONIZED_IO
.
_SC_FSYNC
-
Inquire about the parameter corresponding to
_POSIX_FSYNC
.
_SC_MAPPED_FILES
-
Inquire about the parameter corresponding to
_POSIX_MAPPED_FILES
.
_SC_MEMLOCK
-
Inquire about the parameter corresponding to
_POSIX_MEMLOCK
.
_SC_MEMLOCK_RANGE
-
Inquire about the parameter corresponding to
_POSIX_MEMLOCK_RANGE
.
_SC_MEMORY_PROTECTION
-
Inquire about the parameter corresponding to
_POSIX_MEMORY_PROTECTION
.
_SC_MESSAGE_PASSING
-
Inquire about the parameter corresponding to
_POSIX_MESSAGE_PASSING
.
_SC_SEMAPHORES
-
Inquire about the parameter corresponding to
_POSIX_SEMAPHORES
.
_SC_SHARED_MEMORY_OBJECTS
-
Inquire about the parameter corresponding to
_POSIX_SHARED_MEMORY_OBJECTS
.
_SC_AIO_LISTIO_MAX
-
Inquire about the parameter corresponding to
_POSIX_AIO_LISTIO_MAX
.
_SC_AIO_MAX
-
Inquire about the parameter corresponding to
_POSIX_AIO_MAX
.
_SC_AIO_PRIO_DELTA_MAX
-
Inquire the value by which a process can decrease its asynchronous I/O
priority level from its own scheduling priority. This corresponds to the
run-time invariant value
AIO_PRIO_DELTA_MAX
.
_SC_DELAYTIMER_MAX
-
Inquire about the parameter corresponding to
_POSIX_DELAYTIMER_MAX
.
_SC_MQ_OPEN_MAX
-
Inquire about the parameter corresponding to
_POSIX_MQ_OPEN_MAX
.
_SC_MQ_PRIO_MAX
-
Inquire about the parameter corresponding to
_POSIX_MQ_PRIO_MAX
.
_SC_RTSIG_MAX
-
Inquire about the parameter corresponding to
_POSIX_RTSIG_MAX
.
_SC_SEM_NSEMS_MAX
-
Inquire about the parameter corresponding to
_POSIX_SEM_NSEMS_MAX
.
_SC_SEM_VALUE_MAX
-
Inquire about the parameter corresponding to
_POSIX_SEM_VALUE_MAX
.
_SC_SIGQUEUE_MAX
-
Inquire about the parameter corresponding to
_POSIX_SIGQUEUE_MAX
.
_SC_TIMER_MAX
-
Inquire about the parameter corresponding to
_POSIX_TIMER_MAX
.
_SC_PII
-
Inquire about the parameter corresponding to
_POSIX_PII
.
_SC_PII_XTI
-
Inquire about the parameter corresponding to
_POSIX_PII_XTI
.
_SC_PII_SOCKET
-
Inquire about the parameter corresponding to
_POSIX_PII_SOCKET
.
_SC_PII_INTERNET
-
Inquire about the parameter corresponding to
_POSIX_PII_INTERNET
.
_SC_PII_OSI
-
Inquire about the parameter corresponding to
_POSIX_PII_OSI
.
_SC_SELECT
-
Inquire about the parameter corresponding to
_POSIX_SELECT
.
_SC_UIO_MAXIOV
-
Inquire about the parameter corresponding to
_POSIX_UIO_MAXIOV
.
_SC_PII_INTERNET_STREAM
-
Inquire about the parameter corresponding to
_POSIX_PII_INTERNET_STREAM
.
_SC_PII_INTERNET_DGRAM
-
Inquire about the parameter corresponding to
_POSIX_PII_INTERNET_DGRAM
.
_SC_PII_OSI_COTS
-
Inquire about the parameter corresponding to
_POSIX_PII_OSI_COTS
.
_SC_PII_OSI_CLTS
-
Inquire about the parameter corresponding to
_POSIX_PII_OSI_CLTS
.
_SC_PII_OSI_M
-
Inquire about the parameter corresponding to
_POSIX_PII_OSI_M
.
_SC_T_IOV_MAX
-
Inquire the value of the value associated with the
T_IOV_MAX
variable.
_SC_THREADS
-
Inquire about the parameter corresponding to
_POSIX_THREADS
.
_SC_THREAD_SAFE_FUNCTIONS
-
Inquire about the parameter corresponding to
_POSIX_THREAD_SAFE_FUNCTIONS
.
_SC_GETGR_R_SIZE_MAX
-
Inquire about the parameter corresponding to
_POSIX_GETGR_R_SIZE_MAX
.
_SC_GETPW_R_SIZE_MAX
-
Inquire about the parameter corresponding to
_POSIX_GETPW_R_SIZE_MAX
.
_SC_LOGIN_NAME_MAX
-
Inquire about the parameter corresponding to
_POSIX_LOGIN_NAME_MAX
.
_SC_TTY_NAME_MAX
-
Inquire about the parameter corresponding to
_POSIX_TTY_NAME_MAX
.
_SC_THREAD_DESTRUCTOR_ITERATIONS
-
Inquire about the parameter corresponding to
_POSIX_THREAD_DESTRUCTOR_ITERATIONS
.
_SC_THREAD_KEYS_MAX
-
Inquire about the parameter corresponding to
_POSIX_THREAD_KEYS_MAX
.
_SC_THREAD_STACK_MIN
-
Inquire about the parameter corresponding to
_POSIX_THREAD_STACK_MIN
.
_SC_THREAD_THREADS_MAX
-
Inquire about the parameter corresponding to
_POSIX_THREAD_THREADS_MAX
.
_SC_THREAD_ATTR_STACKADDR
-
Inquire about the parameter corresponding to
a
_POSIX_THREAD_ATTR_STACKADDR
.
_SC_THREAD_ATTR_STACKSIZE
-
Inquire about the parameter corresponding to
_POSIX_THREAD_ATTR_STACKSIZE
.
_SC_THREAD_PRIORITY_SCHEDULING
-
Inquire about the parameter corresponding to
_POSIX_THREAD_PRIORITY_SCHEDULING
.
_SC_THREAD_PRIO_INHERIT
-
Inquire about the parameter corresponding to
_POSIX_THREAD_PRIO_INHERIT
.
_SC_THREAD_PRIO_PROTECT
-
Inquire about the parameter corresponding to
_POSIX_THREAD_PRIO_PROTECT
.
_SC_THREAD_PROCESS_SHARED
-
Inquire about the parameter corresponding to
_POSIX_THREAD_PROCESS_SHARED
.
_SC_2_C_DEV
-
Inquire about whether the system has the POSIX.2 C compiler command,
c89
.
_SC_2_FORT_DEV
-
Inquire about whether the system has the POSIX.2 Fortran compiler
command,
fort77
.
_SC_2_FORT_RUN
-
Inquire about whether the system has the POSIX.2
asa
command to
interpret Fortran carriage control.
_SC_2_LOCALEDEF
-
Inquire about whether the system has the POSIX.2
localedef
command.
_SC_2_SW_DEV
-
Inquire about whether the system has the POSIX.2 commands
ar
,
make
, and strip
.
_SC_BC_BASE_MAX
-
Inquire about the maximum value of
obase
in the bc
utility.
_SC_BC_DIM_MAX
-
Inquire about the maximum size of an array in the
bc
utility.
_SC_BC_SCALE_MAX
-
Inquire about the maximum value of
scale
in the bc
utility.
_SC_BC_STRING_MAX
-
Inquire about the maximum size of a string constant in the
bc
utility.
_SC_COLL_WEIGHTS_MAX
-
Inquire about the maximum number of weights that can necessarily
be used in defining the collating sequence for a locale.
_SC_EXPR_NEST_MAX
-
Inquire about the maximum number of expressions nested within
parentheses when using the
expr
utility.
_SC_LINE_MAX
-
Inquire about the maximum size of a text line that the POSIX.2 text
utilities can handle.
_SC_EQUIV_CLASS_MAX
-
Inquire about the maximum number of weights that can be assigned to an
entry of the
LC_COLLATE
category `order' keyword in a locale
definition. The GNU C library does not presently support locale
definitions.
_SC_VERSION
-
Inquire about the version number of POSIX.1 that the library and kernel
support.
_SC_2_VERSION
-
Inquire about the version number of POSIX.2 that the system utilities
support.
_SC_PAGESIZE
-
Inquire about the virtual memory page size of the machine.
getpagesize
returns the same value (see section How to get information about the memory subsystem?).
_SC_NPROCESSORS_CONF
-
Inquire about the number of configured processors.
_SC_NPROCESSORS_ONLN
-
Inquire about the number of processors online.
_SC_PHYS_PAGES
-
Inquire about the number of physical pages in the system.
_SC_AVPHYS_PAGES
-
Inquire about the number of available physical pages in the system.
_SC_ATEXIT_MAX
-
Inquire about the number of functions which can be registered as termination
functions for
atexit
; see section Cleanups on Exit.
_SC_XOPEN_VERSION
-
Inquire about the parameter corresponding to
_XOPEN_VERSION
.
_SC_XOPEN_XCU_VERSION
-
Inquire about the parameter corresponding to
_XOPEN_XCU_VERSION
.
_SC_XOPEN_UNIX
-
Inquire about the parameter corresponding to
_XOPEN_UNIX
.
_SC_XOPEN_REALTIME
-
Inquire about the parameter corresponding to
_XOPEN_REALTIME
.
_SC_XOPEN_REALTIME_THREADS
-
Inquire about the parameter corresponding to
_XOPEN_REALTIME_THREADS
.
_SC_XOPEN_LEGACY
-
Inquire about the parameter corresponding to
_XOPEN_LEGACY
.
_SC_XOPEN_CRYPT
-
Inquire about the parameter corresponding to
_XOPEN_CRYPT
.
_SC_XOPEN_ENH_I18N
-
Inquire about the parameter corresponding to
_XOPEN_ENH_I18N
.
_SC_XOPEN_SHM
-
Inquire about the parameter corresponding to
_XOPEN_SHM
.
_SC_XOPEN_XPG2
-
Inquire about the parameter corresponding to
_XOPEN_XPG2
.
_SC_XOPEN_XPG3
-
Inquire about the parameter corresponding to
_XOPEN_XPG3
.
_SC_XOPEN_XPG4
-
Inquire about the parameter corresponding to
_XOPEN_XPG4
.
_SC_CHAR_BIT
-
Inquire about the number of bits in a variable of type
char
.
_SC_CHAR_MAX
-
Inquire about the maximum value which can be stored in a variable of type
char
.
_SC_CHAR_MIN
-
Inquire about the minimum value which can be stored in a variable of type
char
.
_SC_INT_MAX
-
Inquire about the maximum value which can be stored in a variable of type
int
.
_SC_INT_MIN
-
Inquire about the minimum value which can be stored in a variable of type
int
.
_SC_LONG_BIT
-
Inquire about the number of bits in a variable of type
long int
.
_SC_WORD_BIT
-
Inquire about the number of bits in a variable of a register word.
_SC_MB_LEN_MAX
-
Inquire the maximum length of a multi-byte representation of a wide
character value.
_SC_NZERO
-
Inquire about the value used to internally represent the zero priority level for
the process execution.
SC_SSIZE_MAX
-
Inquire about the maximum value which can be stored in a variable of type
ssize_t
.
_SC_SCHAR_MAX
-
Inquire about the maximum value which can be stored in a variable of type
signed char
.
_SC_SCHAR_MIN
-
Inquire about the minimum value which can be stored in a variable of type
signed char
.
_SC_SHRT_MAX
-
Inquire about the maximum value which can be stored in a variable of type
short int
.
_SC_SHRT_MIN
-
Inquire about the minimum value which can be stored in a variable of type
short int
.
_SC_UCHAR_MAX
-
Inquire about the maximum value which can be stored in a variable of type
unsigned char
.
_SC_UINT_MAX
-
Inquire about the maximum value which can be stored in a variable of type
unsigned int
.
_SC_ULONG_MAX
-
Inquire about the maximum value which can be stored in a variable of type
unsigned long int
.
_SC_USHRT_MAX
-
Inquire about the maximum value which can be stored in a variable of type
unsigned short int
.
_SC_NL_ARGMAX
-
Inquire about the parameter corresponding to
NL_ARGMAX
.
_SC_NL_LANGMAX
-
Inquire about the parameter corresponding to
NL_LANGMAX
.
_SC_NL_MSGMAX
-
Inquire about the parameter corresponding to
NL_MSGMAX
.
_SC_NL_NMAX
-
Inquire about the parameter corresponding to
NL_NMAX
.
_SC_NL_SETMAX
-
Inquire about the parameter corresponding to
NL_SETMAX
.
_SC_NL_TEXTMAX
-
Inquire about the parameter corresponding to
NL_TEXTMAX
.
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