split: bad error message

src/uu/split/src/split.rs

@@ -21,6 +21,7 @@ use std::io::{BufRead, BufReader, BufWriter, ErrorKind, Read, Seek, SeekFrom, Wr
 use std::path::Path;
 use thiserror::Error;
 use uucore::display::Quotable;
+use uucore::error::strip_errno;
 use uucore::error::{FromIo, UIoError, UResult, USimpleError, UUsageError};
 use uucore::translate;
 
@@ -1573,7 +1574,10 @@ fn split(settings: &Settings) -> UResult<()> {
         }
         Strategy::Lines(chunk_size) => {
             let mut writer = LineChunkWriter::new(chunk_size, settings)?;
-            copy(&mut reader, &mut writer)
+            if let Err(e) = io::copy(&mut reader, &mut writer) {
+                return Err(USimpleError::new(1, strip_errno(&e).clone()));
+            }
+            Ok(())
         }
         Strategy::Bytes(chunk_size) => {
             let mut writer = ByteChunkWriter::new(chunk_size, settings)?;

tests/by-util/test_split.rs

@@ -2068,3 +2068,12 @@ fn test_split_directory_already_exists() {
         .no_stdout()
         .stderr_is("split: 'xaa': Is a directory\n");
 }
+
+#[test]
+#[cfg(target_os = "linux")]
+fn test_io_error() {
+    let scene = new_ucmd!().arg("/proc/self/mem").fails_with_code(1);
+    let stderr = scene.stderr_str();
+
+    assert!(stderr == "split: Input/output error\n" || stderr == "split: I/O error\n");
+}