implement randomness

crates/wasi-c2/src/ctx.rs

@@ -1,5 +1,6 @@
 use crate::dir::{DirCaps, DirEntry, WasiDir};
 use crate::file::{FileCaps, FileEntry, WasiFile};
+use crate::random::WasiRandom;
 use crate::string_array::{StringArray, StringArrayError};
 use crate::table::Table;
 use crate::Error;
@@ -10,6 +11,7 @@ use std::rc::Rc;
 pub struct WasiCtx {
     pub(crate) args: StringArray,
     pub(crate) env: StringArray,
+    pub(crate) random: Box<dyn WasiRandom>,
     table: Rc<RefCell<Table>>,
 }
 
@@ -22,6 +24,7 @@ impl WasiCtx {
         WasiCtx {
             args: StringArray::new(),
             env: StringArray::new(),
+            random: Box::new(crate::random::GetRandom),
             table: Rc::new(RefCell::new(Table::new())),
         }
     }
@@ -110,4 +113,9 @@ impl WasiCtxBuilder {
         )))?;
         Ok(self)
     }
+
+    pub fn random(&mut self, random: Box<dyn WasiRandom>) -> &mut Self {
+        self.0.random = random;
+        self
+    }
 }