fix: return ENOTSUP instead of -1 for unsupported syscalls

Negative errno value is not expected at least by wasi-libc.

src/fd.ts

@@ -3,85 +3,85 @@ import * as wasi from "./wasi_defs.js";
 
 export class Fd {
   fd_advise(offset: bigint, len: bigint, advice: number): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   fd_allocate(offset: bigint, len: bigint): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   fd_close(): number {
     return 0;
   }
   fd_datasync(): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   fd_fdstat_get(): { ret: number; fdstat: wasi.Fdstat | null } {
-    return { ret: -1, fdstat: null };
+    return { ret: wasi.ERRNO_NOTSUP, fdstat: null };
   }
   fd_fdstat_set_flags(flags: number): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   fd_fdstat_set_rights(
     fs_rights_base: bigint,
     fs_rights_inheriting: bigint,
   ): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   fd_filestat_get(): { ret: number; filestat: wasi.Filestat | null } {
-    return { ret: -1, filestat: null };
+    return { ret: wasi.ERRNO_NOTSUP, filestat: null };
   }
   fd_filestat_set_size(size: bigint): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   fd_filestat_set_times(atim: bigint, mtim: bigint, fst_flags: number): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   fd_pread(view8: Uint8Array, iovs: Array<wasi.Iovec>, offset: bigint) {
-    return { ret: -1, nread: 0 };
+    return { ret: wasi.ERRNO_NOTSUP, nread: 0 };
   }
   fd_prestat_get() {
-    return { ret: -1, prestat: null };
+    return { ret: wasi.ERRNO_NOTSUP, prestat: null };
   }
   fd_prestat_dir_name() {
-    return { ret: -1, prestat_dir_name: null };
+    return { ret: wasi.ERRNO_NOTSUP, prestat_dir_name: null };
   }
   fd_pwrite(view8: Uint8Array, iovs: Array<wasi.Ciovec>, offset: bigint) {
-    return { ret: -1, nwritten: 0 };
+    return { ret: wasi.ERRNO_NOTSUP, nwritten: 0 };
   }
   fd_read(
     view8: Uint8Array,
     iovs: Array<wasi.Iovec>,
   ): { ret: number; nread: number } {
-    return { ret: -1, nread: 0 };
+    return { ret: wasi.ERRNO_NOTSUP, nread: 0 };
   }
   fd_readdir_single(cookie: bigint): {
     ret: number;
     dirent: wasi.Dirent | null;
   } {
-    return { ret: -1, dirent: null };
+    return { ret: wasi.ERRNO_NOTSUP, dirent: null };
   }
   fd_seek(offset: bigint, whence: number): { ret: number; offset: bigint } {
-    return { ret: -1, offset: 0n };
+    return { ret: wasi.ERRNO_NOTSUP, offset: 0n };
   }
   fd_sync(): number {
     return 0;
   }
   fd_tell(): { ret: number; offset: bigint } {
-    return { ret: -1, offset: 0n };
+    return { ret: wasi.ERRNO_NOTSUP, offset: 0n };
   }
   fd_write(view8: Uint8Array, iovs: Array<wasi.Ciovec>) {
-    return { ret: -1, nwritten: 0 };
+    return { ret: wasi.ERRNO_NOTSUP, nwritten: 0 };
   }
   path_create_directory(path): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   path_filestat_get(flags, path) {
-    return { ret: -1, filestat: null };
+    return { ret: wasi.ERRNO_NOTSUP, filestat: null };
   }
   path_filestat_set_times(flags, path, atim, mtim, fst_flags) {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   path_link(old_fd, old_flags, old_path, new_path): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   path_open(
     dirflags,
@@ -91,21 +91,21 @@ export class Fd {
     fs_rights_inheriting,
     fdflags,
   ) {
-    return { ret: -1, fd_obj: null };
+    return { ret: wasi.ERRNO_NOTSUP, fd_obj: null };
   }
   path_readlink(path) {
-    return { ret: -1, data: null };
+    return { ret: wasi.ERRNO_NOTSUP, data: null };
   }
   path_remove_directory(path): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   path_rename(old_path, new_fd, new_path): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   path_symlink(old_path, new_path): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
   path_unlink_file(path): number {
-    return -1;
+    return wasi.ERRNO_NOTSUP;
   }
 }