Struct PollFlags 

pub struct PollFlags(/* private fields */);

Available on crate feature poll only.

These flags define the different events that can be monitored by poll and ppoll

Implementations

impl PollFlags

pub const POLLIN: PollFlags

There is data to read.

pub const POLLPRI: PollFlags

There is some exceptional condition on the file descriptor.

Possibilities include:

• There is out-of-band data on a TCP socket (see tcp(7)).
• A pseudoterminal master in packet mode has seen a state change on the slave (see ioctl_tty(2)).
• A cgroup.events file has been modified (see cgroups(7)).

pub const POLLOUT: PollFlags

Writing is now possible, though a write larger that the available space in a socket or pipe will still block (unless O_NONBLOCK is set).

pub const POLLRDNORM: PollFlags

Available on non-Redox only.

Equivalent to POLLIN

pub const POLLWRNORM: PollFlags

Available on non-Redox only.

Equivalent to POLLOUT

pub const POLLRDBAND: PollFlags

Available on non-Redox only.

Priority band data can be read (generally unused on Linux).

pub const POLLWRBAND: PollFlags

Available on non-Redox only.

Priority data may be written.

pub const POLLERR: PollFlags

Error condition (only returned in PollFd::revents; ignored in PollFd::new). This bit is also set for a file descriptor referring to the write end of a pipe when the read end has been closed.

pub const POLLHUP: PollFlags

Hang up (only returned in PollFd::revents; ignored in PollFd::new). Note that when reading from a channel such as a pipe or a stream socket, this event merely indicates that the peer closed its end of the channel. Subsequent reads from the channel will return 0 (end of file) only after all outstanding data in the channel has been consumed.

pub const POLLNVAL: PollFlags

Invalid request: fd not open (only returned in PollFd::revents; ignored in PollFd::new).

impl PollFlags

pub const fn empty() -> PollFlags

Get a flags value with all bits unset.

pub const fn all() -> PollFlags

Get a flags value with all known bits set.

pub const fn bits(&self) -> i16

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

pub const fn from_bits(bits: i16) -> Option<PollFlags>

Convert from a bits value.

This method will return None if any unknown bits are set.

pub const fn from_bits_truncate(bits: i16) -> PollFlags

Convert from a bits value, unsetting any unknown bits.

pub const fn from_bits_retain(bits: i16) -> PollFlags

Convert from a bits value exactly.

pub fn from_name(name: &str) -> Option<PollFlags>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

pub const fn intersects(&self, other: PollFlags) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

Examples found in repository

examples/monitor.rs (line 21)

fn main() -> std::io::Result<()> {
    let cec = CecDevice::open("/dev/cec0")?;
    let capas = cec.get_capas();
    println!("capas  {:?}", capas);
    cec.set_mode(CecModeInitiator::None, CecModeFollower::Monitor)?;

    loop {
        let f = cec.poll(
            PollFlags::POLLIN | PollFlags::POLLRDNORM | PollFlags::POLLPRI,
            PollTimeout::NONE,
        )?;

        if f.intersects(PollFlags::POLLPRI) {
            let evt = cec.get_event()?;
            println!("evt {:x?}", evt);
        }
        if f.contains(PollFlags::POLLIN | PollFlags::POLLRDNORM) {
            let msg = cec.rec()?;

            if msg.is_ok() {
                match (msg.initiator(), msg.destination(), msg.opcode()) {
                    (i, d, Some(Ok(o))) => {
                        println!("msg {:?}->{:?} {:?} {:x?}", i, d, o, msg.parameters());
                    }
                    _ => println!("msg {:x?}", msg),
                }
            } else {
                println!("msg {:x?}", msg);
            }
        }
    }
}

pub const fn contains(&self, other: PollFlags) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

Examples found in repository

examples/monitor.rs (line 25)

fn main() -> std::io::Result<()> {
    let cec = CecDevice::open("/dev/cec0")?;
    let capas = cec.get_capas();
    println!("capas  {:?}", capas);
    cec.set_mode(CecModeInitiator::None, CecModeFollower::Monitor)?;

    loop {
        let f = cec.poll(
            PollFlags::POLLIN | PollFlags::POLLRDNORM | PollFlags::POLLPRI,
            PollTimeout::NONE,
        )?;

        if f.intersects(PollFlags::POLLPRI) {
            let evt = cec.get_event()?;
            println!("evt {:x?}", evt);
        }
        if f.contains(PollFlags::POLLIN | PollFlags::POLLRDNORM) {
            let msg = cec.rec()?;

            if msg.is_ok() {
                match (msg.initiator(), msg.destination(), msg.opcode()) {
                    (i, d, Some(Ok(o))) => {
                        println!("msg {:?}->{:?} {:?} {:x?}", i, d, o, msg.parameters());
                    }
                    _ => println!("msg {:x?}", msg),
                }
            } else {
                println!("msg {:x?}", msg);
            }
        }
    }
}

pub fn insert(&mut self, other: PollFlags)

The bitwise or (|) of the bits in two flags values.

pub fn remove(&mut self, other: PollFlags)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

pub fn toggle(&mut self, other: PollFlags)

The bitwise exclusive-or (^) of the bits in two flags values.

pub fn set(&mut self, other: PollFlags, value: bool)

Call insert when value is true or remove when value is false.

pub const fn intersection(self, other: PollFlags) -> PollFlags

The bitwise and (&) of the bits in two flags values.

pub const fn union(self, other: PollFlags) -> PollFlags

The bitwise or (|) of the bits in two flags values.

pub const fn difference(self, other: PollFlags) -> PollFlags

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

pub const fn symmetric_difference(self, other: PollFlags) -> PollFlags

The bitwise exclusive-or (^) of the bits in two flags values.

pub const fn complement(self) -> PollFlags

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl PollFlags

pub const fn iter(&self) -> Iter<PollFlags>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

pub const fn iter_names(&self) -> IterNames<PollFlags>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

Trait Implementations

impl Binary for PollFlags

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

Formats the value using the given formatter.

impl BitAnd for PollFlags

fn bitand(self, other: PollFlags) -> PollFlags

The bitwise and (&) of the bits in two flags values.

type Output = PollFlags

The resulting type after applying the & operator.

impl BitAndAssign for PollFlags

fn bitand_assign(&mut self, other: PollFlags)

The bitwise and (&) of the bits in two flags values.

impl BitOr for PollFlags

fn bitor(self, other: PollFlags) -> PollFlags

The bitwise or (|) of the bits in two flags values.

type Output = PollFlags

The resulting type after applying the | operator.

impl BitOrAssign for PollFlags

fn bitor_assign(&mut self, other: PollFlags)

The bitwise or (|) of the bits in two flags values.

impl BitXor for PollFlags

fn bitxor(self, other: PollFlags) -> PollFlags

The bitwise exclusive-or (^) of the bits in two flags values.

type Output = PollFlags

The resulting type after applying the ^ operator.

impl BitXorAssign for PollFlags

fn bitxor_assign(&mut self, other: PollFlags)

The bitwise exclusive-or (^) of the bits in two flags values.

impl Clone for PollFlags

fn clone(&self) -> PollFlags

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PollFlags

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

Formats the value using the given formatter.

impl Extend<PollFlags> for PollFlags

fn extend<T>(&mut self, iterator: T)

where T: IntoIterator<Item = PollFlags>,

The bitwise or (|) of the bits in each flags value.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Flags for PollFlags

const FLAGS: &'static [Flag<PollFlags>]

The set of defined flags.

type Bits = i16

The underlying bits type.

fn bits(&self) -> i16

Get the underlying bits value.

fn from_bits_retain(bits: i16) -> PollFlags

Convert from a bits value exactly.

fn empty() -> Self

Get a flags value with all bits unset.

fn all() -> Self

Get a flags value with all known bits set.

fn contains_unknown_bits(&self) -> bool

This method will return true if any unknown bits are set.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.

fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

fn iter(&self) -> Iter<Self>

Yield a set of contained flags values.

fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values.

fn iter_defined_names() -> IterDefinedNames<Self>

Yield a set of all named flags defined by Self::FLAGS.

fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

fn intersects(&self, other: Self) -> bool

where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.

fn contains(&self, other: Self) -> bool

where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.

fn truncate(&mut self)

where Self: Sized,

Remove any unknown bits from the flags.

fn insert(&mut self, other: Self)

where Self: Sized,

The bitwise or (|) of the bits in two flags values.

fn remove(&mut self, other: Self)

where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!).

fn toggle(&mut self, other: Self)

where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.

fn set(&mut self, other: Self, value: bool)

where Self: Sized,

Call Flags::insert when value is true or Flags::remove when value is false.

fn clear(&mut self)

where Self: Sized,

Unsets all bits in the flags.

fn intersection(self, other: Self) -> Self

The bitwise and (&) of the bits in two flags values.

fn union(self, other: Self) -> Self

The bitwise or (|) of the bits in two flags values.

fn difference(self, other: Self) -> Self

The intersection of a source flags value with the complement of a target flags value (&!).

fn symmetric_difference(self, other: Self) -> Self

The bitwise exclusive-or (^) of the bits in two flags values.

fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl FromIterator<PollFlags> for PollFlags

fn from_iter<T>(iterator: T) -> PollFlags

where T: IntoIterator<Item = PollFlags>,

The bitwise or (|) of the bits in each flags value.

impl Hash for PollFlags

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

where __H: Hasher,

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoIterator for PollFlags

type Item = PollFlags

The type of the elements being iterated over.

type IntoIter = Iter<PollFlags>

Which kind of iterator are we turning this into?

fn into_iter(self) -> <PollFlags as IntoIterator>::IntoIter

Creates an iterator from a value.

impl LowerHex for PollFlags

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

Formats the value using the given formatter.

impl Not for PollFlags

fn not(self) -> PollFlags

The bitwise negation (!) of the bits in a flags value, truncating the result.

type Output = PollFlags

The resulting type after applying the ! operator.

impl Octal for PollFlags

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

Formats the value using the given formatter.

impl Ord for PollFlags

fn cmp(&self, other: &PollFlags) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for PollFlags

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for PollFlags

fn partial_cmp(&self, other: &PollFlags) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Sub for PollFlags

fn sub(self, other: PollFlags) -> PollFlags

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

type Output = PollFlags

The resulting type after applying the - operator.

impl SubAssign for PollFlags

fn sub_assign(&mut self, other: PollFlags)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

impl UpperHex for PollFlags

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

Formats the value using the given formatter.

impl Copy for PollFlags

impl Eq for PollFlags

impl StructuralPartialEq for PollFlags