From 8fa7635419e557f0fbf5d1ca448a2d753b681740 Mon Sep 17 00:00:00 2001
From: Jacob Young <jacobly0@users.noreply.github.com>
Date: Sun, 4 Feb 2024 03:47:17 +0100
Subject: [PATCH] stage1: implement fd_fdstat_get

I thought this might be needed, so may as well keep the implementation.
---
 stage1/wasi.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/stage1/wasi.c b/stage1/wasi.c
index b6896b9ceb43..bbbaac488bc0 100644
--- a/stage1/wasi.c
+++ b/stage1/wasi.c
@@ -203,7 +203,9 @@ struct DirEntry {
 static uint32_t fd_len;
 static struct FileDescriptor {
     uint32_t de;
+    enum wasi_fdflags fdflags;
     FILE *stream;
+    uint64_t fs_rights_inheriting;
 } *fds;
 
 static void *dupe(const void *data, size_t len) {
@@ -707,13 +709,17 @@ uint32_t wasi_snapshot_preview1_path_filestat_get(uint32_t fd, uint32_t flags, u
 }
 
 uint32_t wasi_snapshot_preview1_fd_fdstat_get(uint32_t fd, uint32_t res_fdstat) {
-    (void)fd;
-    (void)res_fdstat;
+    uint8_t *const m = *wasm_memory;
+    struct wasi_fdstat *res_fdstat_ptr = (struct wasi_fdstat *)&m[res_fdstat];
 #if LOG_TRACE
     fprintf(stderr, "wasi_snapshot_preview1_fd_fdstat_get(%u)\n", fd);
 #endif
 
-    panic("unimplemented");
+    if (fd >= fd_len || fds[fd].de >= de_len) return wasi_errno_badf;
+    res_fdstat_ptr->fs_filetype = des[fds[fd].de].filetype;
+    res_fdstat_ptr->fs_flags = fds[fd].fdflags;
+    res_fdstat_ptr->padding = 0;
+    res_fdstat_ptr->fs_rights_inheriting = fds[fd].fs_rights_inheriting;
     return wasi_errno_success;
 }
 
@@ -770,7 +776,6 @@ uint32_t wasi_snapshot_preview1_fd_write(uint32_t fd, uint32_t iovs, uint32_t io
 uint32_t wasi_snapshot_preview1_path_open(uint32_t fd, uint32_t dirflags, uint32_t path, uint32_t path_len, uint32_t oflags, uint64_t fs_rights_base, uint64_t fs_rights_inheriting, uint32_t fdflags, uint32_t res_fd) {
     uint8_t *const m = *wasm_memory;
     const char *path_ptr = (const char *)&m[path];
-    (void)fs_rights_inheriting;
     uint32_t *res_fd_ptr = (uint32_t *)&m[res_fd];
 #if LOG_TRACE
     fprintf(stderr, "wasi_snapshot_preview1_path_open(%u, 0x%X, \"%.*s\", 0x%X, 0x%llX, 0x%llX, 0x%X)\n", fd, dirflags, (int)path_len, path_ptr, oflags, (unsigned long long)fs_rights_base, (unsigned long long)fs_rights_inheriting, fdflags);
@@ -792,10 +797,12 @@ uint32_t wasi_snapshot_preview1_path_open(uint32_t fd, uint32_t dirflags, uint32
         fds = new_fds;
 
         fds[fd_len].de = de;
+        fds[fd_len].fdflags = fdflags;
         switch (des[de].filetype) {
             case wasi_filetype_directory: fds[fd_len].stream = NULL; break;
             default: panic("unimplemented");
         }
+        fds[fd_len].fs_rights_inheriting = fs_rights_inheriting;
 
 #if LOG_TRACE
         fprintf(stderr, "fd = %u\n", fd_len);
@@ -855,7 +862,9 @@ uint32_t wasi_snapshot_preview1_path_open(uint32_t fd, uint32_t dirflags, uint32
     fprintf(stderr, "fd = %u\n", fd_len);
 #endif
     fds[fd_len].de = de;
+    fds[fd_len].fdflags = fdflags;
     fds[fd_len].stream = stream;
+    fds[fd_len].fs_rights_inheriting = fs_rights_inheriting;
     *res_fd_ptr = fd_len;
     fd_len += 1;
     return wasi_errno_success;