wc: failing test fix

Author: venoosoo

src/uu/wc/src/wc.rs

@@ -59,14 +59,19 @@ fn try_get_stdin_size() -> Option<usize> {
             return None;
         };
 
-        let file_type = rustix::fs::FileType::from_raw_mode(stat.st_mode);
+        if rustix::fs::FileType::from_raw_mode(stat.st_mode) != rustix::fs::FileType::RegularFile {
+            return None;
+        }
+
+        let Ok(fs) = rustix::fs::fstatfs(fd) else {
+            return None;
+        };
 
-        if file_type == rustix::fs::FileType::RegularFile && stat.st_size > 0 && stat.st_nlink == 1
-        {
-            return Some(stat.st_size as usize);
+        if fs.f_type == rustix::fs::PROC_SUPER_MAGIC {
+            return None;
         }
 
-        None
+        Some(stat.st_size as usize)
     }
     #[cfg(not(unix))]
     {