Added Unix Implementations for Send and Recv

Added Send and Recv to OMRSOCK API

- Simply calls the system socket api send and recv.
- System send and recv will block until the message is sent or
  received.
- Added small argument testing and set the error codes from system
  socket api.

Issue: eclipse-omr#5069

Signed-off-by: Haley Cao <haleycao88@hotmail.com>

include_core/omrporterror.h

@@ -333,6 +333,8 @@
 #define OMRPORT_ERROR_SOCK_LISTEN_FAILED (OMRPORT_ERROR_SOCK_BASE - 8)
 #define OMRPORT_ERROR_SOCK_CONNECT_FAILED (OMRPORT_ERROR_SOCK_BASE - 9)
 #define OMRPORT_ERROR_SOCK_ACCEPT_FAILED (OMRPORT_ERROR_SOCK_BASE - 10)
+#define OMRPORT_ERROR_SOCK_SEND_FAILED (OMRPORT_ERROR_SOCK_BASE - 11)
+#define OMRPORT_ERROR_SOCK_RECV_FAILED (OMRPORT_ERROR_SOCK_BASE - 12)
 /**
  * @}
  */

port/unix/omrsock.c

@@ -550,7 +550,19 @@ omrsock_accept(struct OMRPortLibrary *portLibrary, omrsock_socket_t serverSock,
 int32_t
 omrsock_send(struct OMRPortLibrary *portLibrary, omrsock_socket_t sock, uint8_t *buf, int32_t nbyte, int32_t flags)
 {
-	return OMRPORT_ERROR_NOT_SUPPORTED_ON_THIS_PLATFORM;
+	int32_t bytesSent = 0;
+
+	if (NULL == sock || 0 >= nbyte) {
+		return OMRPORT_ERROR_INVALID_ARGUMENTS;
+	}
+
+	bytesSent = send(sock->data, buf, nbyte, flags);
+
+	if (-1 == bytesSent) {
+		portLibrary->error_set_last_error(portLibrary, errno, OMRPORT_ERROR_SOCK_SEND_FAILED);
+	}
+
+	return bytesSent;
 }
 
 int32_t
@@ -562,7 +574,19 @@ omrsock_sendto(struct OMRPortLibrary *portLibrary, omrsock_socket_t sock, uint8_
 int32_t
 omrsock_recv(struct OMRPortLibrary *portLibrary, omrsock_socket_t sock, uint8_t *buf, int32_t nbyte, int32_t flags)
 {
-	return OMRPORT_ERROR_NOT_SUPPORTED_ON_THIS_PLATFORM;
+	int32_t bytesRecv = 0;
+
+	if (NULL == sock || 0 >= nbyte) {
+		return OMRPORT_ERROR_INVALID_ARGUMENTS;
+	}
+
+	bytesRecv = recv(sock->data, buf, nbyte, flags);
+
+	if (-1 == bytesRecv) {
+		portLibrary->error_set_last_error(portLibrary, errno, OMRPORT_ERROR_SOCK_RECV_FAILED);
+	}
+
+	return bytesRecv;
 }
 
 int32_t