Remove SocketData and now only pass the dart port to epoll.

runtime/bin/socket_linux.cc

Index: runtime/bin/socket_linux.cc
diff --git a/runtime/bin/socket_linux.cc b/runtime/bin/socket_linux.cc
index db7704b211e3a2d47e29d38c32678992bfbef3b3..133e3335ec939fa747935b487fc2eaef7b159324 100644
--- a/runtime/bin/socket_linux.cc
+++ b/runtime/bin/socket_linux.cc
@@ -60,8 +60,8 @@ bool Socket::Initialize() {
 
 intptr_t Socket::Create(RawAddr addr) {
   intptr_t fd;
-  fd = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(socket(addr.ss.ss_family, SOCK_STREAM,
-                                               0));
+  fd = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(socket(
+      addr.ss.ss_family, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0));
   if (fd < 0) {
     const int kBufferSize = 1024;
     char error_buf[kBufferSize];
@@ -69,8 +69,6 @@ intptr_t Socket::Create(RawAddr addr) {
                   strerror_r(errno, error_buf, kBufferSize));
     return -1;
   }
-
-  FDUtils::SetCloseOnExec(fd);
   return fd;
 }
 
@@ -94,9 +92,6 @@ intptr_t Socket::CreateConnect(RawAddr addr, const intptr_t port) {
   if (fd < 0) {
     return fd;
   }
-
-  Socket::SetNonBlocking(fd);
-
   return Socket::Connect(fd, addr, port);
 }
 
@@ -315,12 +310,12 @@ intptr_t Socket::CreateBindDatagram(
     RawAddr* addr, intptr_t port, bool reuseAddress) {
   intptr_t fd;
 
-  fd = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(
-      socket(addr->addr.sa_family, SOCK_DGRAM, IPPROTO_UDP));
+  fd = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(socket(
+      addr->addr.sa_family,
+      SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
+      IPPROTO_UDP));
   if (fd < 0) return -1;
 
-  FDUtils::SetCloseOnExec(fd);
-
   if (reuseAddress) {
     int optval = 1;
     VOID_TEMP_FAILURE_RETRY_BLOCK_SIGNALS(
@@ -335,8 +330,6 @@ intptr_t Socket::CreateBindDatagram(
     TEMP_FAILURE_RETRY_BLOCK_SIGNALS(close(fd));
     return -1;
   }
-
-  Socket::SetNonBlocking(fd);
   return fd;
 }
 
@@ -398,12 +391,10 @@ intptr_t ServerSocket::CreateBindListen(RawAddr addr,
                                         bool v6_only) {
   intptr_t fd;
 
-  fd = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(socket(addr.ss.ss_family, SOCK_STREAM,
-                                               0));
+  fd = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(socket(
+      addr.ss.ss_family, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0));
   if (fd < 0) return -1;
 
-  FDUtils::SetCloseOnExec(fd);
-
   int optval = 1;
   TEMP_FAILURE_RETRY_BLOCK_SIGNALS(
       setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)));
@@ -440,7 +431,6 @@ intptr_t ServerSocket::CreateBindListen(RawAddr addr,
     return -1;
   }
 
-  Socket::SetNonBlocking(fd);
   return fd;
 }
 
@@ -459,7 +449,8 @@ intptr_t ServerSocket::Accept(intptr_t fd) {
   intptr_t socket;
   struct sockaddr clientaddr;
   socklen_t addrlen = sizeof(clientaddr);
-  socket = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(accept(fd, &clientaddr, &addrlen));
+  socket = TEMP_FAILURE_RETRY_BLOCK_SIGNALS(accept4(
+        fd, &clientaddr, &addrlen, SOCK_NONBLOCK | SOCK_CLOEXEC));
   if (socket == -1) {
     if (IsTemporaryAcceptError(errno)) {
       // We need to signal to the caller that this is actually not an
@@ -468,8 +459,6 @@ intptr_t ServerSocket::Accept(intptr_t fd) {
       ASSERT(kTemporaryFailure != -1);
       socket = kTemporaryFailure;
     }
-  } else {
-    Socket::SetNonBlocking(socket);
   }
   return socket;
 }
@@ -486,16 +475,6 @@ void Socket::Close(intptr_t fd) {
 }
 
 
-bool Socket::SetNonBlocking(intptr_t fd) {
-  return FDUtils::SetNonBlocking(fd);
-}
-
-
-bool Socket::SetBlocking(intptr_t fd) {
-  return FDUtils::SetBlocking(fd);
-}
-
-
 bool Socket::GetNoDelay(intptr_t fd, bool* enabled) {
   int on;
   socklen_t len = sizeof(on);