Struct udev::Event

pub struct Event { /* private fields */ }

An event that indicates a change in device state.

Implementations

impl Event

pub fn event_type(&self) -> EventType

Returns the EventType corresponding to this event.

pub fn sequence_number(&self) -> u64

Returns the event’s sequence number.

pub fn device(&self) -> Device

Returns the device associated with this event.

Methods from Deref<Target = Device>

pub fn is_initialized(&self) -> bool

Checks whether the device has already been handled by udev.

When a new device is connected to the system, udev initializes the device by setting permissions, renaming network devices, and possibly other initialization routines. This method returns true if udev has performed all of its work to initialize this device.

This method only applies to devices with device nodes or network interfaces. All other devices return true by default.

pub fn devnum(&self) -> Option<dev_t>

Gets the device’s major/minor number.

pub fn syspath(&self) -> &Path

Returns the syspath of the device.

The path is an absolute path and includes the sys mount point. For example, the syspath for tty0 could be /sys/devices/virtual/tty/tty0, which includes the sys mount point, /sys.

pub fn devpath(&self) -> &OsStr

Returns the kernel devpath value of the device.

The path does not contain the sys mount point, but does start with a /. For example, the devpath for tty0 could be /devices/virtual/tty/tty0.

pub fn devnode(&self) -> Option<&Path>

Returns the path to the device node belonging to the device.

The path is an absolute path and starts with the device directory. For example, the device node for tty0 could be /dev/tty0.

pub fn parent(&self) -> Option<Self>

Returns the parent of the device.

pub fn parent_with_subsystem<T: AsRef<OsStr>>(
    &self,
    subsystem: T
) -> Result<Option<Self>>

Returns the parent of the device with the matching subsystem and devtype if any.

pub fn parent_with_subsystem_devtype<T: AsRef<OsStr>, U: AsRef<OsStr>>(
    &self,
    subsystem: T,
    devtype: U
) -> Result<Option<Self>>

Returns the parent of the device with the matching subsystem and devtype if any.

pub fn subsystem(&self) -> Option<&OsStr>

Returns the subsystem name of the device.

The subsystem name is a string that indicates which kernel subsystem the device belongs to. Examples of subsystem names are tty, vtconsole, block, scsi, and net.

pub fn sysname(&self) -> &OsStr

Returns the kernel device name for the device.

The sysname is a string that differentiates the device from others in the same subsystem. For example, tty0 is the sysname for a TTY device that differentiates it from others, such as tty1.

pub fn sysnum(&self) -> Option<usize>

Returns the instance number of the device.

The instance number is used to differentiate many devices of the same type. For example, /dev/tty0 and /dev/tty1 are both TTY devices but have instance numbers of 0 and 1, respectively.

Some devices don’t have instance numbers, such as /dev/console, in which case the method returns None.

pub fn devtype(&self) -> Option<&OsStr>

Returns the devtype name of the device.

pub fn driver(&self) -> Option<&OsStr>

Returns the name of the kernel driver attached to the device.

pub fn property_value<T: AsRef<OsStr>>(&self, property: T) -> Option<&OsStr>

Retreives the value of a device property.

pub fn attribute_value<T: AsRef<OsStr>>(&self, attribute: T) -> Option<&OsStr>

Retreives the value of a device attribute.

pub fn properties(&self) -> Properties<'_>

Returns an iterator over the device’s properties.

Example

This example prints out all of a device’s properties:

for property in device.properties() {
    println!("{:?} = {:?}", property.name(), property.value());
}

pub fn attributes(&self) -> Attributes<'_>

Returns an iterator over the device’s attributes.

Example

This example prints out all of a device’s attributes:

for attribute in device.attributes() {
    println!("{:?} = {:?}", attribute.name(), attribute.value());
}

pub fn action(&self) -> Option<&OsStr>

Returns the device action for the device.

Trait Implementations

impl Deref for Event

Provides access to the device associated with the event.

type Target = Device

The resulting type after dereferencing.

fn deref(&self) -> &Device

Dereferences the value.