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example(uffd): dont panic if read(2) from uffd returns -EAGAIN #5307

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Merged
merged 1 commit into from
Jul 15, 2025
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example(uffd): dont panic if read(2) from uffd returns -EAGAIN #5307

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7 changes: 3 additions & 4 deletions src/firecracker/examples/uffd/fault_all_handler.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -35,10 +35,9 @@ fn main() {
runtime.run(
|uffd_handler: &mut UffdHandler| {
// Read an event from the userfaultfd.
let event = uffd_handler
.read_event()
.expect("Failed to read uffd_msg")
.expect("uffd_msg not ready");
let Some(event) = uffd_handler.read_event().expect("Failed to read uffd_msg") else {
return;
};

if let userfaultfd::Event::Pagefault { addr, .. } = event {
let bit =
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