From 78cc6399c90b297c94eb367f223d1aa714210c8b Mon Sep 17 00:00:00 2001
From: oech3 <79379754+oech3@users.noreply.github.com>
Date: Sat, 6 Jun 2026 21:13:39 +0900
Subject: [PATCH] split: read ahead input

---
 Cargo.lock                | 1 +
 fuzz/Cargo.lock           | 1 +
 src/uu/split/Cargo.toml   | 1 +
 src/uu/split/src/split.rs | 2 ++
 4 files changed, 5 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index 6bea0cd88..dd9f31c65 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4138,6 +4138,7 @@ dependencies = [
  "codspeed-divan-compat",
  "fluent",
  "memchr",
+ "rustix",
  "tempfile",
  "thiserror 2.0.18",
  "uucore",
diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock
index 234ea76a6..8b2870c66 100644
--- a/fuzz/Cargo.lock
+++ b/fuzz/Cargo.lock
@@ -2066,6 +2066,7 @@ dependencies = [
  "clap",
  "fluent",
  "memchr",
+ "rustix",
  "thiserror",
  "uucore",
 ]
diff --git a/src/uu/split/Cargo.toml b/src/uu/split/Cargo.toml
index 84e3b246e..60dbba0dd 100644
--- a/src/uu/split/Cargo.toml
+++ b/src/uu/split/Cargo.toml
@@ -21,6 +21,7 @@ doctest = false
 [dependencies]
 clap = { workspace = true }
 memchr = { workspace = true }
+rustix = { workspace = true }
 uucore = { workspace = true, features = ["fs", "parser-size"] }
 thiserror = { workspace = true }
 fluent = { workspace = true }
diff --git a/src/uu/split/src/split.rs b/src/uu/split/src/split.rs
index 1e790a364..ace96a746 100644
--- a/src/uu/split/src/split.rs
+++ b/src/uu/split/src/split.rs
@@ -1539,6 +1539,8 @@ fn split(settings: &Settings) -> UResult<()> {
         let r = File::open(Path::new(&settings.input)).map_err_context(
             || translate!("split-error-cannot-open-for-reading", "file" => settings.input.quote()),
         )?;
+        #[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
+        let _ = rustix::fs::fadvise(&r, 0, None, rustix::fs::Advice::Sequential);
         Box::new(r) as Box<dyn Read>
     };
     let mut reader = if let Some(c) = settings.io_blksize {