Implement F_DUPFD_CLOEXEC

src/syscall/debug.rs

@@ -111,6 +111,7 @@ pub fn format_call(a: usize, b: usize, c: usize, d: usize, e: usize, f: usize) -
                 F_SETFD => "F_SETFD",
                 F_SETFL => "F_SETFL",
                 F_GETFL => "F_GETFL",
+                F_DUPFD_CLOEXEC => "F_DUPFD_CLOEXEC",
                 _ => "UNKNOWN",
             },
             c,