wasi: add wasi sock_accept stub

Refs: nodejs/uvwasi#185

Add stub for sock_accept so that we have stubs
for all of the sock methods in wasi_snapshot_preview1.
Its a bit awkward as the method was added after the
initial definitial of wasi_snapshot-preview1 but I
think it should be semver minor at most to add
the method.

Depends on nodejs/uvwasi#185
being landed in uvwasi first and an updated version
of uvwasi that includes that being pulled into
Node.js

Signed-off-by: Michael Dawson <mdawson@devrus.com>

PR-URL: nodejs#46434
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

src/node_wasi.cc

@@ -1503,6 +1503,37 @@ void WASI::SchedYield(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(err);
 }
 
+void WASI::SockAccept(const FunctionCallbackInfo<Value>& args) {
+  WASI* wasi;
+  uint32_t sock;
+  uint32_t flags;
+  uint32_t fd_ptr;
+  char* memory;
+  size_t mem_size;
+  RETURN_IF_BAD_ARG_COUNT(args, 3);
+  CHECK_TO_TYPE_OR_RETURN(args, args[0], Uint32, sock);
+  CHECK_TO_TYPE_OR_RETURN(args, args[1], Uint32, flags);
+  CHECK_TO_TYPE_OR_RETURN(args, args[2], Uint32, fd_ptr);
+  ASSIGN_INITIALIZED_OR_RETURN_UNWRAP(&wasi, args.This());
+  Debug(wasi,
+        "sock_accept(%d, %d, %d)\n",
+        sock,
+        flags,
+        fd_ptr);
+  GET_BACKING_STORE_OR_RETURN(wasi, args, &memory, &mem_size);
+  CHECK_BOUNDS_OR_RETURN(args, mem_size, fd_ptr, UVWASI_SERDES_SIZE_fd_t);
+
+  uvwasi_fd_t fd;
+  uvwasi_errno_t err =  uvwasi_sock_accept(&wasi->uvw_,
+                                           sock,
+                                           flags,
+                                           &fd);
+
+  if (err == UVWASI_ESUCCESS)
+    uvwasi_serdes_write_size_t(memory, fd_ptr, fd);
+
+  args.GetReturnValue().Set(err);
+}
 
 void WASI::SockRecv(const FunctionCallbackInfo<Value>& args) {
   WASI* wasi;
@@ -1720,6 +1751,7 @@ static void Initialize(Local<Object> target,
   SetProtoMethod(isolate, tmpl, "proc_raise", WASI::ProcRaise);
   SetProtoMethod(isolate, tmpl, "random_get", WASI::RandomGet);
   SetProtoMethod(isolate, tmpl, "sched_yield", WASI::SchedYield);
+  SetProtoMethod(isolate, tmpl, "sock_accept", WASI::SockAccept);
   SetProtoMethod(isolate, tmpl, "sock_recv", WASI::SockRecv);
   SetProtoMethod(isolate, tmpl, "sock_send", WASI::SockSend);
   SetProtoMethod(isolate, tmpl, "sock_shutdown", WASI::SockShutdown);

src/node_wasi.h

@@ -71,6 +71,7 @@ class WASI : public BaseObject,
   static void ProcRaise(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RandomGet(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void SchedYield(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void SockAccept(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void SockRecv(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void SockSend(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void SockShutdown(const v8::FunctionCallbackInfo<v8::Value>& args);

test/wasi/c/sock.c

@@ -0,0 +1,17 @@
+#include <sys/socket.h>
+#include <stddef.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdio.h>
+
+// TODO(mhdawson): Update once sock_accept is implemented in uvwasi
+int main(void) {
+  int fd = 0 ;
+  socklen_t addrlen = 0;
+  int flags = 0;
+  int ret = accept(0, NULL, &addrlen);
+  assert(ret == -1);
+  assert(errno == ENOTSUP);
+
+  return 0;
+}

test/wasi/test-wasi.js

@@ -92,6 +92,7 @@ if (process.argv[2] === 'wasi-child') {
     stdout: `hello from input.txt${checkoutEOL}hello from input.txt${checkoutEOL}`,
   });
   runWASI({ test: 'stat' });
+  runWASI({ test: 'sock' });
   runWASI({ test: 'write_file' });
 
   // Tests that are currently unsupported on Windows.