Enum nix::unistd::SysconfVar

#[repr(i32)]pub enum SysconfVar {
    AIO_LISTIO_MAX,
    AIO_MAX,
    AIO_PRIO_DELTA_MAX,
    ARG_MAX,
    ATEXIT_MAX,
    BC_BASE_MAX,
    BC_DIM_MAX,
    BC_SCALE_MAX,
    BC_STRING_MAX,
    CHILD_MAX,
    CLK_TCK,
    COLL_WEIGHTS_MAX,
    DELAYTIMER_MAX,
    EXPR_NEST_MAX,
    HOST_NAME_MAX,
    IOV_MAX,
    LINE_MAX,
    LOGIN_NAME_MAX,
    NGROUPS_MAX,
    GETGR_R_SIZE_MAX,
    GETPW_R_SIZE_MAX,
    MQ_OPEN_MAX,
    MQ_PRIO_MAX,
    OPEN_MAX,
    _POSIX_ADVISORY_INFO,
    _POSIX_BARRIERS,
    _POSIX_ASYNCHRONOUS_IO,
    _POSIX_CLOCK_SELECTION,
    _POSIX_CPUTIME,
    _POSIX_FSYNC,
    _POSIX_IPV6,
    _POSIX_JOB_CONTROL,
    _POSIX_MAPPED_FILES,
    _POSIX_MEMLOCK,
    _POSIX_MEMLOCK_RANGE,
    _POSIX_MEMORY_PROTECTION,
    _POSIX_MESSAGE_PASSING,
    _POSIX_MONOTONIC_CLOCK,
    _POSIX_PRIORITIZED_IO,
    _POSIX_PRIORITY_SCHEDULING,
    _POSIX_RAW_SOCKETS,
    _POSIX_READER_WRITER_LOCKS,
    _POSIX_REALTIME_SIGNALS,
    _POSIX_REGEXP,
    _POSIX_SAVED_IDS,
    _POSIX_SEMAPHORES,
    _POSIX_SHARED_MEMORY_OBJECTS,
    _POSIX_SHELL,
    _POSIX_SPAWN,
    _POSIX_SPIN_LOCKS,
    _POSIX_SPORADIC_SERVER,
    _POSIX_SS_REPL_MAX,
    _POSIX_SYNCHRONIZED_IO,
    _POSIX_THREAD_ATTR_STACKADDR,
    _POSIX_THREAD_ATTR_STACKSIZE,
    _POSIX_THREAD_CPUTIME,
    _POSIX_THREAD_PRIO_INHERIT,
    _POSIX_THREAD_PRIO_PROTECT,
    _POSIX_THREAD_PRIORITY_SCHEDULING,
    _POSIX_THREAD_PROCESS_SHARED,
    _POSIX_THREAD_ROBUST_PRIO_INHERIT,
    _POSIX_THREAD_ROBUST_PRIO_PROTECT,
    _POSIX_THREAD_SAFE_FUNCTIONS,
    _POSIX_THREAD_SPORADIC_SERVER,
    _POSIX_THREADS,
    _POSIX_TIMEOUTS,
    _POSIX_TIMERS,
    _POSIX_TRACE,
    _POSIX_TRACE_EVENT_FILTER,
    _POSIX_TRACE_EVENT_NAME_MAX,
    _POSIX_TRACE_INHERIT,
    _POSIX_TRACE_LOG,
    _POSIX_TRACE_NAME_MAX,
    _POSIX_TRACE_SYS_MAX,
    _POSIX_TRACE_USER_EVENT_MAX,
    _POSIX_TYPED_MEMORY_OBJECTS,
    _POSIX_VERSION,
    _POSIX_V6_ILP32_OFF32,
    _POSIX_V6_ILP32_OFFBIG,
    _POSIX_V6_LP64_OFF64,
    _POSIX_V6_LPBIG_OFFBIG,
    _POSIX2_C_BIND,
    _POSIX2_C_DEV,
    _POSIX2_CHAR_TERM,
    _POSIX2_FORT_DEV,
    _POSIX2_FORT_RUN,
    _POSIX2_LOCALEDEF,
    _POSIX2_PBS,
    _POSIX2_PBS_ACCOUNTING,
    _POSIX2_PBS_CHECKPOINT,
    _POSIX2_PBS_LOCATE,
    _POSIX2_PBS_MESSAGE,
    _POSIX2_PBS_TRACK,
    _POSIX2_SW_DEV,
    _POSIX2_UPE,
    _POSIX2_VERSION,
    PAGE_SIZE,
    PTHREAD_DESTRUCTOR_ITERATIONS,
    PTHREAD_KEYS_MAX,
    PTHREAD_STACK_MIN,
    PTHREAD_THREADS_MAX,
    RE_DUP_MAX,
    RTSIG_MAX,
    SEM_NSEMS_MAX,
    SEM_VALUE_MAX,
    SIGQUEUE_MAX,
    STREAM_MAX,
    SYMLOOP_MAX,
    TIMER_MAX,
    TTY_NAME_MAX,
    TZNAME_MAX,
    _XOPEN_CRYPT,
    _XOPEN_ENH_I18N,
    _XOPEN_LEGACY,
    _XOPEN_REALTIME,
    _XOPEN_REALTIME_THREADS,
    _XOPEN_SHM,
    _XOPEN_STREAMS,
    _XOPEN_UNIX,
    _XOPEN_VERSION,
}

Variable names for sysconf

Nix uses the same naming convention for these variables as the getconf(1) utility. That is, SysconfVar variables have the same name as the abstract variables shown in the sysconf(3) man page. Usually, it’s the same as the C variable name without the leading _SC_.

All of these symbols are standardized by POSIX 1003.1-2008, but haven’t been implemented by all platforms.

References

• sysconf(3)
• unistd.h
• limits.h

Variants

AIO_LISTIO_MAX

Maximum number of I/O operations in a single list I/O call supported by the implementation.

AIO_MAX

Maximum number of outstanding asynchronous I/O operations supported by the implementation.

AIO_PRIO_DELTA_MAX

The maximum amount by which a process can decrease its asynchronous I/O priority level from its own scheduling priority.

ARG_MAX

Maximum length of argument to the exec functions including environment data.

ATEXIT_MAX

Maximum number of functions that may be registered with atexit.

BC_BASE_MAX

Maximum obase values allowed by the bc utility.

BC_DIM_MAX

Maximum number of elements permitted in an array by the bc utility.

BC_SCALE_MAX

Maximum scale value allowed by the bc utility.

BC_STRING_MAX

Maximum length of a string constant accepted by the bc utility.

CHILD_MAX

Maximum number of simultaneous processes per real user ID.

CLK_TCK

COLL_WEIGHTS_MAX

Maximum number of weights that can be assigned to an entry of the LC_COLLATE order keyword in the locale definition file

DELAYTIMER_MAX

Maximum number of timer expiration overruns.

EXPR_NEST_MAX

Maximum number of expressions that can be nested within parentheses by the expr utility.

HOST_NAME_MAX

Maximum length of a host name (not including the terminating null) as returned from the gethostname function

IOV_MAX

Maximum number of iovec structures that one process has available for use with readv or writev.

LINE_MAX

Unless otherwise noted, the maximum length, in bytes, of a utility’s input line (either standard input or another file), when the utility is described as processing text files. The length includes room for the trailing .

LOGIN_NAME_MAX

Maximum length of a login name.

NGROUPS_MAX

Maximum number of simultaneous supplementary group IDs per process.

GETGR_R_SIZE_MAX

Initial size of getgrgid_r and getgrnam_r data buffers

GETPW_R_SIZE_MAX

Initial size of getpwuid_r and getpwnam_r data buffers

MQ_OPEN_MAX

The maximum number of open message queue descriptors a process may hold.

MQ_PRIO_MAX

The maximum number of message priorities supported by the implementation.

OPEN_MAX

A value one greater than the maximum value that the system may assign to a newly-created file descriptor.

_POSIX_ADVISORY_INFO

The implementation supports the Advisory Information option.

_POSIX_BARRIERS

The implementation supports barriers.

_POSIX_ASYNCHRONOUS_IO

The implementation supports asynchronous input and output.

_POSIX_CLOCK_SELECTION

The implementation supports clock selection.

_POSIX_CPUTIME

The implementation supports the Process CPU-Time Clocks option.

_POSIX_FSYNC

The implementation supports the File Synchronization option.

_POSIX_IPV6

The implementation supports the IPv6 option.

_POSIX_JOB_CONTROL

The implementation supports job control.

_POSIX_MAPPED_FILES

The implementation supports memory mapped Files.

_POSIX_MEMLOCK

The implementation supports the Process Memory Locking option.

_POSIX_MEMLOCK_RANGE

The implementation supports the Range Memory Locking option.

_POSIX_MEMORY_PROTECTION

The implementation supports memory protection.

_POSIX_MESSAGE_PASSING

The implementation supports the Message Passing option.

_POSIX_MONOTONIC_CLOCK

The implementation supports the Monotonic Clock option.

_POSIX_PRIORITIZED_IO

The implementation supports the Prioritized Input and Output option.

_POSIX_PRIORITY_SCHEDULING

The implementation supports the Process Scheduling option.

_POSIX_RAW_SOCKETS

The implementation supports the Raw Sockets option.

_POSIX_READER_WRITER_LOCKS

The implementation supports read-write locks.

_POSIX_REALTIME_SIGNALS

The implementation supports realtime signals.

_POSIX_REGEXP

The implementation supports the Regular Expression Handling option.

_POSIX_SAVED_IDS

Each process has a saved set-user-ID and a saved set-group-ID.

_POSIX_SEMAPHORES

The implementation supports semaphores.

_POSIX_SHARED_MEMORY_OBJECTS

The implementation supports the Shared Memory Objects option.

_POSIX_SHELL

The implementation supports the POSIX shell.

_POSIX_SPAWN

The implementation supports the Spawn option.

_POSIX_SPIN_LOCKS

The implementation supports spin locks.

_POSIX_SPORADIC_SERVER

The implementation supports the Process Sporadic Server option.

_POSIX_SS_REPL_MAX

_POSIX_SYNCHRONIZED_IO

The implementation supports the Synchronized Input and Output option.

_POSIX_THREAD_ATTR_STACKADDR

The implementation supports the Thread Stack Address Attribute option.

_POSIX_THREAD_ATTR_STACKSIZE

The implementation supports the Thread Stack Size Attribute option.

_POSIX_THREAD_CPUTIME

The implementation supports the Thread CPU-Time Clocks option.

_POSIX_THREAD_PRIO_INHERIT

The implementation supports the Non-Robust Mutex Priority Inheritance option.

_POSIX_THREAD_PRIO_PROTECT

The implementation supports the Non-Robust Mutex Priority Protection option.

_POSIX_THREAD_PRIORITY_SCHEDULING

The implementation supports the Thread Execution Scheduling option.

_POSIX_THREAD_PROCESS_SHARED

The implementation supports the Thread Process-Shared Synchronization option.

_POSIX_THREAD_ROBUST_PRIO_INHERIT

The implementation supports the Robust Mutex Priority Inheritance option.

_POSIX_THREAD_ROBUST_PRIO_PROTECT

The implementation supports the Robust Mutex Priority Protection option.

_POSIX_THREAD_SAFE_FUNCTIONS

The implementation supports thread-safe functions.

_POSIX_THREAD_SPORADIC_SERVER

The implementation supports the Thread Sporadic Server option.

_POSIX_THREADS

The implementation supports threads.

_POSIX_TIMEOUTS

The implementation supports timeouts.

_POSIX_TIMERS

The implementation supports timers.

_POSIX_TRACE

The implementation supports the Trace option.

_POSIX_TRACE_EVENT_FILTER

The implementation supports the Trace Event Filter option.

_POSIX_TRACE_EVENT_NAME_MAX

_POSIX_TRACE_INHERIT

The implementation supports the Trace Inherit option.

_POSIX_TRACE_LOG

The implementation supports the Trace Log option.

_POSIX_TRACE_NAME_MAX

_POSIX_TRACE_SYS_MAX

_POSIX_TRACE_USER_EVENT_MAX

_POSIX_TYPED_MEMORY_OBJECTS

The implementation supports the Typed Memory Objects option.

_POSIX_VERSION

Integer value indicating version of this standard (C-language binding) to which the implementation conforms. For implementations conforming to POSIX.1-2008, the value shall be 200809L.

_POSIX_V6_ILP32_OFF32

The implementation provides a C-language compilation environment with 32-bit int, long, pointer, and off_t types.

_POSIX_V6_ILP32_OFFBIG

The implementation provides a C-language compilation environment with 32-bit int, long, and pointer types and an off_t type using at least 64 bits.

_POSIX_V6_LP64_OFF64

The implementation provides a C-language compilation environment with 32-bit int and 64-bit long, pointer, and off_t types.

_POSIX_V6_LPBIG_OFFBIG

The implementation provides a C-language compilation environment with an int type using at least 32 bits and long, pointer, and off_t types using at least 64 bits.

_POSIX2_C_BIND

The implementation supports the C-Language Binding option.

_POSIX2_C_DEV

The implementation supports the C-Language Development Utilities option.

_POSIX2_CHAR_TERM

The implementation supports the Terminal Characteristics option.

_POSIX2_FORT_DEV

The implementation supports the FORTRAN Development Utilities option.

_POSIX2_FORT_RUN

The implementation supports the FORTRAN Runtime Utilities option.

_POSIX2_LOCALEDEF

The implementation supports the creation of locales by the localedef utility.

_POSIX2_PBS

The implementation supports the Batch Environment Services and Utilities option.

_POSIX2_PBS_ACCOUNTING

The implementation supports the Batch Accounting option.

_POSIX2_PBS_CHECKPOINT

The implementation supports the Batch Checkpoint/Restart option.

_POSIX2_PBS_LOCATE

The implementation supports the Locate Batch Job Request option.

_POSIX2_PBS_MESSAGE

The implementation supports the Batch Job Message Request option.

_POSIX2_PBS_TRACK

The implementation supports the Track Batch Job Request option.

_POSIX2_SW_DEV

The implementation supports the Software Development Utilities option.

_POSIX2_UPE

The implementation supports the User Portability Utilities option.

_POSIX2_VERSION

Integer value indicating version of the Shell and Utilities volume of POSIX.1 to which the implementation conforms.

PAGE_SIZE

The size of a system page in bytes.

POSIX also defines an alias named PAGESIZE, but Rust does not allow two enum constants to have the same value, so nix omits PAGESIZE.

PTHREAD_DESTRUCTOR_ITERATIONS

PTHREAD_KEYS_MAX

PTHREAD_STACK_MIN

PTHREAD_THREADS_MAX

RE_DUP_MAX

RTSIG_MAX

SEM_NSEMS_MAX

SEM_VALUE_MAX

SIGQUEUE_MAX

STREAM_MAX

SYMLOOP_MAX

TIMER_MAX

TTY_NAME_MAX

TZNAME_MAX

_XOPEN_CRYPT

The implementation supports the X/Open Encryption Option Group.

_XOPEN_ENH_I18N

The implementation supports the Issue 4, Version 2 Enhanced Internationalization Option Group.

_XOPEN_LEGACY

_XOPEN_REALTIME

The implementation supports the X/Open Realtime Option Group.

_XOPEN_REALTIME_THREADS

The implementation supports the X/Open Realtime Threads Option Group.

_XOPEN_SHM

The implementation supports the Issue 4, Version 2 Shared Memory Option Group.

_XOPEN_STREAMS

The implementation supports the XSI STREAMS Option Group.

_XOPEN_UNIX

The implementation supports the XSI option

_XOPEN_VERSION

Integer value indicating version of the X/Open Portability Guide to which the implementation conforms.

Trait Implementations

impl Clone for SysconfVar

fn clone(&self) -> SysconfVar

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for SysconfVar

impl Debug for SysconfVar

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for SysconfVar

impl Hash for SysconfVar

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

pub fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl PartialEq<SysconfVar> for SysconfVar

fn eq(&self, other: &SysconfVar) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]pub fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl StructuralEq for SysconfVar

impl StructuralPartialEq for SysconfVar