Discard empty writes in wasi-common as well

bytecodealliance · Dec 6, 2023 · da98aa5 · da98aa5
1 parent 4930670
commit da98aa5
Show file tree

Hide file tree

Showing 2 changed files with 6 additions and 0 deletions.
diff --git a/crates/wasi-common/cap-std-sync/src/file.rs b/crates/wasi-common/cap-std-sync/src/file.rs
@@ -113,6 +113,9 @@ impl WasiFile for File {
         bufs: &[io::IoSlice<'a>],
         offset: u64,
     ) -> Result<u64, Error> {
+        if bufs.iter().map(|i| i.len()).sum::<usize>() == 0 {
+            return Ok(0);
+        }
         let n = self.0.write_vectored_at(bufs, offset)?;
         Ok(n.try_into()?)
     }

diff --git a/crates/wasi-common/tokio/src/file.rs b/crates/wasi-common/tokio/src/file.rs
@@ -148,6 +148,9 @@ macro_rules! wasi_file_impl {
                 bufs: &[io::IoSlice<'a>],
                 offset: u64,
             ) -> Result<u64, Error> {
+                if bufs.iter().map(|i| i.len()).sum::<usize>() == 0 {
+                    return Ok(0);
+                }
                 block_on_dummy_executor(move || self.0.write_vectored_at(bufs, offset))
             }
             async fn seek(&self, pos: std::io::SeekFrom) -> Result<u64, Error> {