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head: catch I/O error with -c 1 #12030

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Merged
cakebaker merged 1 commit into from
Apr 27, 2026
Merged

head: catch I/O error with -c 1 #12030

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11 changes: 6 additions & 5 deletions src/uu/head/src/head.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -169,8 +169,11 @@ fn wrap_in_stdout_error(err: io::Error) -> io::Error {
// zero-copy fast-path
#[cfg(any(target_os = "linux", target_os = "android"))]
fn print_n_bytes(input: impl Read + AsFd, n: u64) -> io::Result<u64> {
let out = io::stdout();
uucore::pipes::send_n_bytes(input, out, n).map_err(wrap_in_stdout_error)
let mut out = io::stdout();
let res = uucore::pipes::send_n_bytes(input, &out, n).map_err(wrap_in_stdout_error);
// flush prevents ignoring I/O error
out.flush().map_err(wrap_in_stdout_error)?;
res
}

#[cfg(not(any(target_os = "linux", target_os = "android")))]
Expand All @@ -184,9 +187,7 @@ fn print_n_bytes(input: impl Read, n: u64) -> io::Result<u64> {

let bytes_written = io::copy(&mut reader, &mut stdout).map_err(wrap_in_stdout_error)?;

// Make sure we finish writing everything to the target before
// exiting. Otherwise, when Rust is implicitly flushing, any
// error will be silently ignored.
// flush prevents ignoring I/O error
stdout.flush().map_err(wrap_in_stdout_error)?;

Ok(bytes_written)
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