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uvc: use blocking event reads by default

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This commit is contained in:
Brad Stein 2026-01-06 05:27:27 -03:00
parent e35af4a46d
commit fb8573d806
1 changed files with 21 additions and 7 deletions
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28
server/src/bin/lesavka-uvc.rs
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@ -108,6 +108,8 @@ fn main() -> Result<()> {
let debug = env::var("LESAVKA_UVC_DEBUG").is_ok();
let mut setup_seen: u64 = 0;
let mut data_seen: u64 = 0;
let mut dq_err_seen: u64 = 0;
let mut dq_err_last: Option<i32> = None;
loop {
let file = open_with_retry(&dev)?;
@ -133,6 +135,14 @@ fn main() -> Result<()> {
let err = std::io::Error::last_os_error();
match err.raw_os_error() {
Some(libc::EAGAIN) | Some(libc::EINTR) | Some(libc::ENOENT) => {
if debug {
let code = err.raw_os_error();
if dq_err_seen < 10 || code != dq_err_last {
eprintln!("[lesavka-uvc] dqevent idle: {err}");
dq_err_seen += 1;
dq_err_last = code;
}
}
thread::sleep(Duration::from_millis(10));
continue;
}
@ -188,7 +198,11 @@ fn main() -> Result<()> {
}
handle_data(fd, uvc_send_response, &mut state, &mut pending, data);
}
_ => {}
_ => {
if debug {
eprintln!("[lesavka-uvc] event type=0x{:08x}", ev.type_);
}
}
}
}
}
@ -255,12 +269,12 @@ impl UvcState {
fn open_with_retry(path: &str) -> Result<std::fs::File> {
for attempt in 1..=200 {
match OpenOptions::new()
.read(true)
.write(true)
.custom_flags(libc::O_NONBLOCK)
.open(path)
{
let mut opts = OpenOptions::new();
opts.read(true).write(true);
if env::var("LESAVKA_UVC_NONBLOCK").is_ok() {
opts.custom_flags(libc::O_NONBLOCK);
}
match opts.open(path) {
Ok(f) => {
eprintln!("[lesavka-uvc] opened {path} (attempt {attempt})");
return Ok(f);