Struct gpio_cdev::LineEventHandle
source · pub struct LineEventHandle { /* private fields */ }
Expand description
Handle for retrieving events from the kernel for a line
In order for userspace to retrieve incoming events on a GPIO,
an event handle must be requested from the chip using
Line::events
.
On success, the kernel creates an anonymous file descriptor
for reading events. This structure is the go-between for callers
and that file descriptor.
Implementations§
source§impl LineEventHandle
impl LineEventHandle
sourcepub fn get_event(&mut self) -> Result<LineEvent, Error>
pub fn get_event(&mut self) -> Result<LineEvent, Error>
Retrieve the next event from the kernel for this line
This blocks while there is not another event available from the
kernel for the line which matches the subscription criteria
specified in the event_flags
when the handle was created.
sourcepub fn get_value(&self) -> Result<u8, Error>
pub fn get_value(&self) -> Result<u8, Error>
Request the current state of this Line from the kernel
This value should be 0 or 1 which a “1” representing that
the line is active. Usually this means that the line is
at logic-level high but it could mean the opposite if the
line has been marked as being ACTIVE_LOW
.
pub fn file(&self) -> &File
pub fn file2(&mut self) -> &File
Trait Implementations§
source§impl AsFd for LineEventHandle
impl AsFd for LineEventHandle
source§fn as_fd(&self) -> BorrowedFd<'_>
fn as_fd(&self) -> BorrowedFd<'_>
Gets the raw file descriptor for the LineEventHandle
.
source§impl AsRawFd for LineEventHandle
impl AsRawFd for LineEventHandle
source§impl AsRef<LineEventHandle> for AsyncLineEventHandle
Available on crate feature async-tokio
only.
impl AsRef<LineEventHandle> for AsyncLineEventHandle
async-tokio
only.source§fn as_ref(&self) -> &LineEventHandle ⓘ
fn as_ref(&self) -> &LineEventHandle ⓘ
source§impl Debug for LineEventHandle
impl Debug for LineEventHandle
source§impl Iterator for LineEventHandle
impl Iterator for LineEventHandle
source§fn next(&mut self) -> Option<Result<LineEvent, Error>>
fn next(&mut self) -> Option<Result<LineEvent, Error>>
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