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>

Author: mhdawson

src/node_wasi.cc

@@ -1234,6 +1234,28 @@ uint32_t WASI::SockShutdown(WASI& wasi,
   return uvwasi_sock_shutdown(&wasi.uvw_, sock, how);
 }
 
+uint32_t WASI::SockAccept(WASI& wasi,
+                          WasmMemory memory,
+                          uint32_t sock,
+                          uint32_t flags,
+                          uint32_t fd_ptr) {
+  Debug(wasi,
+        "sock_accept(%d, %d, %d)\n",
+        sock,
+        flags,
+        fd_ptr);
+  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.data, fd_ptr, fd);
+
+  return err;
+}
+
 void WASI::_SetMemory(const FunctionCallbackInfo<Value>& args) {
   WASI* wasi;
   ASSIGN_OR_RETURN_UNWRAP(&wasi, args.This());
@@ -1306,6 +1328,7 @@ static void Initialize(Local<Object> target,
   V(SockRecv, "sock_recv")
   V(SockSend, "sock_send")
   V(SockShutdown, "sock_shutdown")
+  V(SockAccept, "sock_accept")
 #undef V
 
   SetInstanceMethod(isolate, tmpl, "_setMemory", WASI::_SetMemory);

src/node_wasi.h

@@ -142,6 +142,7 @@ class WASI : public BaseObject,
   static uint32_t SockSend(
       WASI&, WasmMemory, uint32_t, uint32_t, uint32_t, uint32_t, uint32_t);
   static uint32_t SockShutdown(WASI&, WasmMemory, uint32_t, uint32_t);
+  static uint32_t SockAccept(WASI&, WasmMemory, uint32_t, uint32_t, uint32_t);
 
   static void _SetMemory(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>
+
+int main(void) {
+
+  int fd = 0 ;
+  socklen_t addrlen = 0;
+  int flags = 0;
+  int ret = accept(0, NULL, &addrlen);
+  assert(ret == -1);
+  assert(errno == 58);
+
+  return 0;
+}

test/wasi/test-wasi.js

@@ -98,6 +98,7 @@ 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.