From b1030d31814f85e8c6619ce1e0246ee214905446 Mon Sep 17 00:00:00 2001
From: Lachlan Sneff <lachlan.sneff@gmail.com>
Date: Fri, 29 Mar 2019 11:03:21 -0700
Subject: [PATCH] Add prestat_t

---
 lib/wasi/src/syscalls/mod.rs   |  2 +-
 lib/wasi/src/syscalls/types.rs | 24 +++++++++++++++++++++++-
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/lib/wasi/src/syscalls/mod.rs b/lib/wasi/src/syscalls/mod.rs
index 0c0298383..d72cbf466 100644
--- a/lib/wasi/src/syscalls/mod.rs
+++ b/lib/wasi/src/syscalls/mod.rs
@@ -238,7 +238,7 @@ pub fn fd_pread(
 pub fn fd_prestat_get(
     ctx: &mut Ctx,
     fd: __wasi_fd_t,
-    buf: WasmPtr<__wasi_fdstat_t>,
+    buf: WasmPtr<__wasi_prestat_t>,
 ) -> __wasi_errno_t {
     unimplemented!()
 }
diff --git a/lib/wasi/src/syscalls/types.rs b/lib/wasi/src/syscalls/types.rs
index 7995e86be..0221b1690 100644
--- a/lib/wasi/src/syscalls/types.rs
+++ b/lib/wasi/src/syscalls/types.rs
@@ -34,7 +34,7 @@ pub const __WASI_DIRCOOKIE_START: u64 = 0;
 pub struct __wasi_dirent_t {
     pub d_next: __wasi_dircookie_t,
     pub d_ino: __wasi_inode_t,
-    pub _namlen: u32,
+    pub d_namlen: u32,
     pub d_type: __wasi_filetype_t,
 }
 
@@ -161,6 +161,28 @@ pub const __WASI_FDFLAG_NONBLOCK: u16 = 1 << 2;
 pub const __WASI_FDFLAG_RSYNC: u16 = 1 << 3;
 pub const __WASI_FDFLAG_SYNC: u16 = 1 << 4;
 
+pub type __wasi_preopentype_t = u8;
+pub const __WASI_PREOPENTYPE_DIR: u8 = 0;
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+#[repr(C)]
+pub struct __wasi_prestat_u_dir_t {
+    pr_name_len: u32,
+}
+
+#[derive(Copy, Clone)]
+#[repr(C)]
+pub union __wasi_prestat_u {
+    dir: __wasi_prestat_u_dir_t,
+}
+
+#[derive(Copy, Clone)]
+#[repr(C)]
+pub struct __wasi_prestat_t {
+    pr_type: __wasi_preopentype_t,
+    u: __wasi_prestat_u,
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[repr(C)]
 pub struct __wasi_fdstat_t {