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tail: improve throughput for -c N file

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This commit is contained in:
oech3
2026-05-20 18:48:42 +02:00
committed by Sylvestre Ledru
parent ef5155aa5c
commit 968f938484
1 changed files with 8 additions and 3 deletions
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src/uu/tail/src/tail.rs
+8 -3
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@@ -576,6 +576,7 @@ fn unbounded_tail<T: Read>(reader: &mut BufReader<T>, settings: &Settings) -> UR
}
// Print the target section of the file
// use zero-copy on Linux
fn print_target_section<
#[cfg(any(target_os = "linux", target_os = "android"))] R: Read + rustix::fd::AsFd,
#[cfg(not(any(target_os = "linux", target_os = "android")))] R: Read,
@@ -586,10 +587,14 @@ fn print_target_section<
let stdout = stdout();
let mut stdout = stdout.lock();
if let Some(limit) = limit {
let mut reader = file.take(limit);
io::copy(&mut reader, &mut stdout)?;
#[cfg(any(target_os = "linux", target_os = "android"))]
uucore::pipes::send_n_bytes(file, &mut stdout, limit)?;
#[cfg(not(any(target_os = "linux", target_os = "android")))]
{
let mut reader = file.take(limit);
io::copy(&mut reader, &mut stdout)?;
}
} else {
// zero-copy fast-path
#[cfg(any(target_os = "linux", target_os = "android"))]
if uucore::pipes::splice_unbounded_broker(file, &mut stdout)? {
io::copy(file, &mut stdout)?;