GNU Info
(libc.info)Constants for Sysconf
Constants for `sysconf' Parameters
----------------------------------
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';
Note: CPU Time.
`_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 (Note: Query Memory
Parameters).
`_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'; Note: 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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