2 files changed, 32 insertions, 0 deletions
diff --git a/src/handlers.rs b/src/handlers.rs
index f583f2400..df77df26a 100644
--- a/src/handlers.rs
+++ b/src/handlers.rs
@@ -38,6 +38,7 @@ pub extern "C" fn msg_from_js(d: *const DenoC, buf: deno_buf) {
     msg::Any::TimerStart => handle_timer_start,
     msg::Any::TimerClear => handle_timer_clear,
     msg::Any::MakeTempDir => handle_make_temp_dir,
+    msg::Any::MkdirSync => handle_mkdir_sync,
     msg::Any::ReadFileSync => handle_read_file_sync,
     msg::Any::SetEnv => handle_set_env,
     msg::Any::StatSync => handle_stat_sync,
@@ -488,6 +489,30 @@ fn handle_make_temp_dir(
   ))
 }
 
+fn handle_mkdir_sync(
+  d: *const DenoC,
+  base: msg::Base,
+  _builder: &mut FlatBufferBuilder,
+) -> HandlerResult {
+  let msg = base.msg_as_mkdir_sync().unwrap();
+  let path = msg.path().unwrap();
+  // TODO let mode = msg.mode();
+  let deno = from_c(d);
+
+  debug!("handle_mkdir_sync {}", path);
+  if deno.flags.allow_write {
+    // TODO(ry) Use mode.
+    deno_fs::mkdir(Path::new(path))?;
+    Ok(null_buf())
+  } else {
+    let err = std::io::Error::new(
+      std::io::ErrorKind::PermissionDenied,
+      "allow_write is off.",
+    );
+    Err(err.into())
+  }
+}
+
 // Prototype https://github.com/denoland/deno/blob/golang/os.go#L171-L184
 fn handle_read_file_sync(
   _d: *const DenoC,
diff --git a/src/msg.fbs b/src/msg.fbs
index ca2e16af7..ebb4077f7 100644
--- a/src/msg.fbs
+++ b/src/msg.fbs
@@ -16,6 +16,7 @@ union Any {
   FetchRes,
   MakeTempDir,
   MakeTempDirRes,
+  MkdirSync,
   ReadFileSync,
   ReadFileSyncRes,
   StatSync,
@@ -166,6 +167,12 @@ table MakeTempDirRes {
   path: string;
 }
 
+table MkdirSync {
+  path: string;
+  mode: uint;
+  // mode specified by https://godoc.org/os#FileMode
+}
+
 table ReadFileSync {
   filename: string;
 }