cp missing missing2 2>/dev/full does not abort

src/uu/cp/src/cp.rs

@@ -39,7 +39,7 @@ use uucore::{backup_control, update_control};
 // requires these enum.
 pub use uucore::{backup_control::BackupMode, update_control::UpdateMode};
 use uucore::{
-    format_usage, parser::shortcut_value_parser::ShortcutValueParser, prompt_yes, show_error,
+    format_usage, parser::shortcut_value_parser::ShortcutValueParser, print_error, prompt_yes,
     show_warning,
 };
 
@@ -833,7 +833,7 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
             // code should still be EXIT_ERR as does GNU cp
             CpError::NotAllFilesCopied => {}
             // Else we caught a fatal bubbled-up error, log it to stderr
-            _ => show_error!("{error}"),
+            _ => print_error!("{error}"),
         }
         set_exit_code(EXIT_ERR);
     }
@@ -1344,10 +1344,10 @@ fn show_error_if_needed(error: &CpError) {
         // Format IoErrContext using strip_errno to remove "(os error N)" suffix
         // for GNU-compatible output
         CpError::IoErrContext(io_err, context) => {
-            show_error!("{}: {}", context, uucore::error::strip_errno(io_err));
+            print_error!("{}: {}", context, uucore::error::strip_errno(io_err));
         }
         _ => {
-            show_error!("{error}");
+            print_error!("{error}");
         }
     }
 }

src/uucore/src/lib/macros.rs

@@ -134,20 +134,9 @@ macro_rules! show_if_err(
     })
 );
 
-/// Show an error to stderr in a similar style to GNU coreutils.
-///
-/// Takes a [`format!`]-like input and prints it to stderr. The output is
-/// prepended with the current utility's name.
-///
-/// # Examples
-///
-/// ```
-/// # #[macro_use]
-/// # extern crate uucore;
-/// # fn main() {
-/// show_error!("Couldn't apply {} to {}", "foo", "bar");
-/// # }
-/// ```
+// todo: Investigate how to show an error to stderr
+// show_error! cause abort with 2>/dev/full
+// Maybe, we should switch to print_error! macro ?
 #[macro_export]
 macro_rules! show_error(
     ($($args:tt)+) => ({
@@ -156,6 +145,16 @@ macro_rules! show_error(
     })
 );
 
+#[macro_export]
+macro_rules! print_error(
+    ($($args:tt)+) => ({
+		use std::io::Write as _;
+		let mut error = std::io::stderr().lock();
+        let _ = write!(error, "{}: ", $crate::util_name());
+        let _ = writeln!(error, $($args)+);
+    })
+);
+
 /// Print a warning message to stderr.
 ///
 /// Takes [`format!`]-compatible input and prepends it with the current