Enum nix::unistd::PathconfVar

#[repr(i32)]
#[non_exhaustive]
pub enum PathconfVar {
    FILESIZEBITS,
    LINK_MAX,
    MAX_CANON,
    MAX_INPUT,
    NAME_MAX,
    PATH_MAX,
    PIPE_BUF,
    POSIX2_SYMLINKS,
    SYMLINK_MAX,
    _POSIX_CHOWN_RESTRICTED,
    _POSIX_NO_TRUNC,
    _POSIX_VDISABLE,
    _POSIX_SYNC_IO,
}

Variable names for pathconf

Nix uses the same naming convention for these variables as the getconf(1) utility. That is, PathconfVar variables have the same name as the abstract variables shown in the pathconf(2) man page. Usually, it’s the same as the C variable name without the leading _PC_.

POSIX 1003.1-2008 standardizes all of these variables, but some OSes choose not to implement variables that cannot change at runtime.

References

• pathconf(2)
• limits.h
• unistd.h

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

FILESIZEBITS

Minimum number of bits needed to represent, as a signed integer value, the maximum size of a regular file allowed in the specified directory.

LINK_MAX

Maximum number of links to a single file.

MAX_CANON

Maximum number of bytes in a terminal canonical input line.

MAX_INPUT

Minimum number of bytes for which space is available in a terminal input queue; therefore, the maximum number of bytes a conforming application may require to be typed as input before reading them.

NAME_MAX

Maximum number of bytes in a filename (not including the terminating null of a filename string).

PATH_MAX

Maximum number of bytes the implementation will store as a pathname in a user-supplied buffer of unspecified size, including the terminating null character. Minimum number the implementation will accept as the maximum number of bytes in a pathname.

PIPE_BUF

Maximum number of bytes that is guaranteed to be atomic when writing to a pipe.

POSIX2_SYMLINKS

Symbolic links can be created.

SYMLINK_MAX

Maximum number of bytes in a symbolic link.

_POSIX_CHOWN_RESTRICTED

The use of chown and fchown is restricted to a process with appropriate privileges, and to changing the group ID of a file only to the effective group ID of the process or to one of its supplementary group IDs.

_POSIX_NO_TRUNC

Pathname components longer than {NAME_MAX} generate an error.

_POSIX_VDISABLE

This symbol shall be defined to be the value of a character that shall disable terminal special character handling.

_POSIX_SYNC_IO

Synchronized input or output operations may be performed for the associated file.

Trait Implementations

impl Clone for PathconfVar

fn clone(&self) -> PathconfVar

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PathconfVar

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

Formats the value using the given formatter.

impl Hash for PathconfVar

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl PartialEq<PathconfVar> for PathconfVar

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

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

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Copy for PathconfVar

impl Eq for PathconfVar

impl StructuralEq for PathconfVar

impl StructuralPartialEq for PathconfVar