adding map_aligned feature separately, in case.

Author: devnexen

src/sys/mman.rs

@@ -637,3 +637,13 @@ pub fn shm_unlink<P: ?Sized + NixPath>(name: &P) -> Result<()> {
 
     Errno::result(ret).map(drop)
 }
+
+/// Matches BSD's `MAP_ALIGNED(x)` macro, x being ilog2(alignment).
+///
+/// For more information, see [`mmap(2)`].
+///
+/// [`mmap(2)`]: https://man.freebsd.org/cgi/man.cgi?mmap(2)
+#[cfg(any(target_os = "netbsd", target_os = "freebsd"))]
+pub const fn map_aligned(v: u32) -> u32 {
+    v << MapFlags::MAP_ALIGNMENT_SHIFT.bits()
+}