add ioctl request id: FIONBIO (no real action, just return Ok(0)). p.s. for rustc

kernel/src/fs/file_like.rs

@@ -34,6 +34,7 @@ impl FileLike {
         match request {
             // TODO: place flags & path in FileLike in stead of FileHandle/Socket
             FIOCLEX => Ok(0),
+            FIONBIO => Ok(0),
             _ => {
                 match self {
                     FileLike::File(file) => file.io_control(request as u32, arg1)?,

kernel/src/fs/ioctl.rs

@@ -34,3 +34,7 @@ pub const FIONCLEX: usize = 0x6602;
 pub const FIOCLEX: usize = 0x5451;
 #[cfg(target_arch = "mips")]
 pub const FIOCLEX: usize = 0x6601;
+
+// rustc using pipe and ioctl pipe file with this request id
+// for non-blocking/blocking IO control setting
+pub const FIONBIO: usize = 0x5421;