syscall: data and flag module updates

src/data.rs

@@ -224,6 +224,38 @@ pub struct TimeSpec {
     pub tv_nsec: i32,
 }
 
+#[derive(Copy, Clone, Debug, Default)]
+#[repr(C)]
+pub struct FutexWaitv {
+    pub uaddr: usize,
+    pub val: usize,
+    pub flags: u32,
+    pub __reserved: u32,
+}
+
+impl Deref for FutexWaitv {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        unsafe {
+            slice::from_raw_parts(
+                self as *const FutexWaitv as *const u8,
+                mem::size_of::<FutexWaitv>(),
+            )
+        }
+    }
+}
+
+impl DerefMut for FutexWaitv {
+    fn deref_mut(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(
+                self as *mut FutexWaitv as *mut u8,
+                mem::size_of::<FutexWaitv>(),
+            )
+        }
+    }
+}
+
 const NANOS_PER_SEC: u128 = 1_000_000_000;
 
 impl TimeSpec {

src/flag.rs

@@ -63,6 +63,8 @@ pub const FUTEX_WAIT: usize = 0;
 pub const FUTEX_WAKE: usize = 1;
 pub const FUTEX_REQUEUE: usize = 2;
 pub const FUTEX_WAIT64: usize = 3;
+/// Wait on multiple futexes atomically and return the index of the first one woken.
+pub const FUTEX_WAIT_MULTIPLE: usize = 4;
 
 // TODO: Split SendFdFlags into caller flags and flags that the scheme receives?
 bitflags::bitflags! {