v8: posix: handle EINTR in socket functions

The socket functions did not handle EINTR (syscall interrupted by signal) which
tripped up the debug agent.

deps/v8/src/platform-posix.cc

@@ -419,7 +419,11 @@ Socket* POSIXSocket::Accept() const {
     return NULL;
   }
 
-  int socket = accept(socket_, NULL, NULL);
+  int socket;
+  do
+    socket = accept(socket_, NULL, NULL);
+  while (socket == -1 && errno == EINTR);
+
   if (socket == -1) {
     return NULL;
   } else {
@@ -446,7 +450,10 @@ bool POSIXSocket::Connect(const char* host, const char* port) {
   }
 
   // Connect.
-  status = connect(socket_, result->ai_addr, result->ai_addrlen);
+  do
+    status = connect(socket_, result->ai_addr, result->ai_addrlen);
+  while (status == -1 && errno == EINTR);
+
   freeaddrinfo(result);
   return status == 0;
 }
@@ -465,13 +472,23 @@ bool POSIXSocket::Shutdown() {
 
 
 int POSIXSocket::Send(const char* data, int len) const {
-  int status = send(socket_, data, len, 0);
+  int status;
+
+  do
+    status = send(socket_, data, len, 0);
+  while (status == -1 && errno == EINTR);
+
   return status;
 }
 
 
 int POSIXSocket::Receive(char* data, int len) const {
-  int status = recv(socket_, data, len, 0);
+  int status;
+
+  do
+    status = recv(socket_, data, len, 0);
+  while (status == -1 && errno == EINTR);
+
   return status;
 }