Use libc::UTIME_NOW in touch when updating time to now

Author: iburaky2

src/uu/touch/src/touch.rs

@@ -3,7 +3,7 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-// spell-checker:ignore (ToDO) filetime datetime lpszfilepath mktime DATETIME datelike timelike
+// spell-checker:ignore (ToDO) filetime datetime lpszfilepath mktime DATETIME datelike timelike UTIME
 // spell-checker:ignore (FORMATS) MMDDhhmm YYYYMMDDHHMM YYMMDDHHMM YYYYMMDDHHMMS
 
 pub mod error;
@@ -377,6 +377,16 @@ pub fn touch(files: &[InputFile], opts: &Options) -> Result<(), TouchError> {
             (atime, mtime)
         }
         Source::Now => {
+            #[cfg(unix)]
+            let now: FileTime;
+            {
+                if opts.date.is_none() {
+                    now = FileTime::from_unix_time(0, libc::UTIME_NOW as u32);
+                } else {
+                    now = datetime_to_filetime(&Local::now());
+                }
+            }
+            #[cfg(not(unix))]
             let now = datetime_to_filetime(&Local::now());
             (now, now)
         }

tests/by-util/test_touch.rs

@@ -1052,3 +1052,10 @@ fn test_touch_non_utf8_paths() {
     scene.ucmd().arg(non_utf8_name).succeeds().no_output();
     assert!(std::fs::metadata(at.plus(non_utf8_name)).is_ok());
 }
+
+#[test]
+#[cfg(target_os = "linux")]
+fn test_touch_dev_full() {
+    let (_, mut ucmd) = at_and_ucmd!();
+    ucmd.args(&["/dev/full"]).succeeds().no_output();
+}