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polling
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Annotate ESP-IDF EPERM error with eventfd info 

If eventfd isn't initialized, `Polling::new` will fail with an EPERM
error. You need to call the "esp_vfs_eventfd_register" function to
initialize the eventfd subsystem in ESP-IDF. This commit indicates to
the user that this needs to happen.

Signed-off-by: John Nunley <dev@notgull.net>
This commit is contained in:
John Nunley 2024-01-27 10:31:27 -08:00 committed by John Nunley
parent ae484a0a12
commit 62430fd56e
1 changed files with 13 additions and 6 deletions
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19
src/poll.rs
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@ -571,13 +571,20 @@ mod notify {
// (1) is not a problem for us, as we want the eventfd() file descriptor to be in a non-blocking mode anyway
// (2) is also not a problem, as long as we don't try to read the counter value in an endless loop when we detect being notified
#[cfg(not(target_os = "espidf"))]
let flags = EventfdFlags::NONBLOCK;
#[cfg(target_os = "espidf")]
let flags = EventfdFlags::empty();
let event_fd = eventfd(0, flags)?;
let event_fd = eventfd(0, flags).map_err(|err| {
match err {
rustix::io::Errno::PERM => {
// EPERM can happen if the eventfd isn't initialized yet.
// Tell the user to call esp_vfs_eventfd_register.
io::Error::new(
io::ErrorKind::PermissionDenied,
"failed to initialize eventfd for polling, try calling `esp_vfs_eventfd_register`"
)
},
err => io::Error::from(err),
}
})?;
Ok(Self { event_fd })
}